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+      <div class="popular-posts-title"><a href="/2020/05/02/聊聊-mysql-的-MVCC-续篇/" rel="bookmark">聊聊 mysql 的 MVCC 续篇</a></div>
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+      <div class="popular-posts-title"><a href="/2020/12/06/Leetcode-155-最小栈-Min-Stack-题解分析/" rel="bookmark">Leetcode 155 最小栈(Min Stack) 题解分析</a></div>
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+        <p>Java 中的这个话题也是比较常遇到的，关于这块原先也是比较忽略的，但是仔细想想又有点遗忘了就在这里记一下<br>简单看下代码<br><code>java.lang.Object#equals</code></p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">equals</span><span class="params">(Object obj)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> (<span class="keyword">this</span> == obj);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
+<p>对于所有对象的父类，<code>equals</code> 方法其实对比的就是对象的地址，也就是是否是同一个对象，试想如果像 Integer 或者 String 这种，我们没有重写 <code>equals</code>，那其实就等于是在用<code>==</code>，可能就没法达到我们的目的，所以像 String 这种常用的 jdk 类都是默认重写了<br><code>java.lang.String#equals</code></p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">equals</span><span class="params">(Object anObject)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (<span class="keyword">this</span> == anObject) &#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">if</span> (anObject <span class="keyword">instanceof</span> String) &#123;</span><br><span class="line">            String anotherString = (String)anObject;</span><br><span class="line">            <span class="keyword">int</span> n = value.length;</span><br><span class="line">            <span class="keyword">if</span> (n == anotherString.value.length) &#123;</span><br><span class="line">                <span class="keyword">char</span> v1[] = value;</span><br><span class="line">                <span class="keyword">char</span> v2[] = anotherString.value;</span><br><span class="line">                <span class="keyword">int</span> i = <span class="number">0</span>;</span><br><span class="line">                <span class="keyword">while</span> (n-- != <span class="number">0</span>) &#123;</span><br><span class="line">                    <span class="keyword">if</span> (v1[i] != v2[i])</span><br><span class="line">                        <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">                    i++;</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
+<p>然后呢就是为啥一些书或者 <code>effective java</code> 中写了 <code>equals</code> 跟 <code>hashCode</code> 要一起重写，这里涉及到当对象作为 <code>HashMap</code> 的 <code>key</code> 的时候<br>首先 <code>HashMap</code> 会使用 <code>hashCode</code> 去判断是否在同一个槽里，然后在通过 <code>equals</code> 去判断是否是同一个 <code>key</code>，是的话就替换，不是的话就链表接下去，如果不重写 <code>hashCode</code> 的话，默认的 <code>object</code> 的<code>hashCode</code> 是 <code>native</code> 方法，根据对象的地址生成的，这样其实对象的值相同的话，因为地址不同，<code>HashMap</code> 也会出现异常，所以需要重写，同时也需要重写 <code>equals</code> 方法，才能确认是同一个 <code>key</code>，而不是落在同一个槽的不同 <code>key</code>.</p>
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rel="tag">美国</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/" rel="tag">自适应拓展</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/" rel="tag">设计模式</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%AF%BB%E5%90%8E%E6%84%9F/" rel="tag">读后感</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%B7%91%E6%AD%A5/" rel="tag">跑步</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%BD%AC%E4%B9%89/" rel="tag">转义</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%BF%90%E5%8A%A8/" rel="tag">运动</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E9%80%92%E5%BD%92/" rel="tag">递归</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E9%A2%98%E8%A7%A3/" rel="tag">题解</a><span class="tag-list-count">6</span></li></ul>
+      </canvas>
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+  </div>
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+      Links
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+      </div>
+    </main>
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+    <footer class="footer">
+      <div class="footer-inner">
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+<div class="copyright">
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+  &copy; 
+  <span itemprop="copyrightYear">2021</span>
+  <span class="with-love">
+    <i class="fa fa-heart"></i>
+  </span>
+  <span class="author" itemprop="copyrightHolder">Nicksxs</span>
+</div>
+  <div class="powered-by">Powered by <a href="https://hexo.io/" class="theme-link" rel="noopener" target="_blank">Hexo</a> & <a href="https://pisces.theme-next.org/" class="theme-link" rel="noopener" target="_blank">NexT.Pisces</a>
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+    <span class="post-meta-item" id="busuanzi_container_site_uv" style="display: none;">
+      <span class="post-meta-item-icon">
+        <i class="fa fa-user"></i>
+      </span>
+      <span class="site-uv" title="Total Visitors">
+        <span id="busuanzi_value_site_uv"></span>
+      </span>
+    </span>
+    <span class="post-meta-divider">|</span>
+    <span class="post-meta-item" id="busuanzi_container_site_pv" style="display: none;">
+      <span class="post-meta-item-icon">
+        <i class="fa fa-eye"></i>
+      </span>
+      <span class="site-pv" title="Total Views">
+        <span id="busuanzi_value_site_pv"></span>
+      </span>
+    </span>
+</div>
+
+
+
+
+
+
+<script>
+  (function() {
+    function leancloudSelector(url) {
+      url = encodeURI(url);
+      return document.getElementById(url).querySelector('.leancloud-visitors-count');
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+
+    function addCount(Counter) {
+      var visitors = document.querySelector('.leancloud_visitors');
+      var url = decodeURI(visitors.id);
+      var title = visitors.dataset.flagTitle;
+
+      Counter('get', '/classes/Counter?where=' + encodeURIComponent(JSON.stringify({ url })))
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+            leancloudSelector(url).innerText = counter.time + 1;
+            Counter('put', '/classes/Counter/' + counter.objectId, { time: { '__op': 'Increment', 'amount': 1 } })
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+                console.error('Failed to save visitor count', error);
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+          } else {
+              leancloudSelector(url).innerText = 'Counter not initialized! More info at console err msg.';
+              console.error('ATTENTION! LeanCloud counter has security bug, see how to solve it here: https://github.com/theme-next/hexo-leancloud-counter-security. \n However, you can still use LeanCloud without security, by setting `security` option to `false`.');
+            
+          }
+        })
+        .catch(error => {
+          console.error('LeanCloud Counter Error', error);
+        });
+    }
+
+    function showTime(Counter) {
+      var visitors = document.querySelectorAll('.leancloud_visitors');
+      var entries = [...visitors].map(element => {
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+      Counter('get', '/classes/Counter?where=' + encodeURIComponent(JSON.stringify({ url: { '$in': entries } })))
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+            let target = results.find(item => item.url === url);
+            leancloudSelector(url).innerText = target ? target.time : 0;
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+          console.error('LeanCloud Counter Error', error);
+        });
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+    let { app_id, app_key, server_url } = {"enable":true,"app_id":"ysza182Vghlqjdt7QiwGLLJy-gzGzoHsz","app_key":"s9GDqbn7gnGGkusf66YRVccw","server_url":"https://leancloud.cn","security":true};
+    function fetchData(api_server) {
+      var Counter = (method, url, data) => {
+        return fetch(`${api_server}/1.1${url}`, {
+          method,
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+            'Content-Type': 'application/json',
+          },
+          body: JSON.stringify(data)
+        });
+      };
+      if (CONFIG.page.isPost) {
+        if (CONFIG.hostname !== location.hostname) return;
+        addCount(Counter);
+      } else if (document.querySelectorAll('.post-title-link').length >= 1) {
+        showTime(Counter);
+      }
+    }
+
+    let api_server = app_id.slice(-9) !== '-MdYXbMMI' ? server_url : `https://${app_id.slice(0, 8).toLowerCase()}.api.lncldglobal.com`;
+
+    if (api_server) {
+      fetchData(api_server);
+    } else {
+      fetch('https://app-router.leancloud.cn/2/route?appId=' + app_id)
+        .then(response => response.json())
+        .then(({ api_server }) => {
+          fetchData('https://' + api_server);
+        });
+    }
+  })();
+</script>
+
+
+      </div>
+    </footer>
+  </div>
+
+  
+  <script src="/lib/anime.min.js"></script>
+  <script src="//cdn.jsdelivr.net/npm/jquery@3/dist/jquery.min.js"></script>
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+  <script src="//cdn.jsdelivr.net/npm/lozad@1/dist/lozad.min.js"></script>
+  <script src="/lib/velocity/velocity.min.js"></script>
+  <script src="/lib/velocity/velocity.ui.min.js"></script>
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+      var x=document.getElementsByTagName("link");
+		//Find the last canonical URL
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+				if(x[i].rel.toLowerCase() == 'canonical' && x[i].href){
+					canonicalURL=x[i].href;
+				}
+			}
+		}
+    //Get protocol
+	    if (!canonicalURL){
+	    	curProtocol = window.location.protocol.split(':')[0];
+	    }
+	    else{
+	    	curProtocol = canonicalURL.split(':')[0];
+	    }
+      //Get current URL if the canonical URL does not exist
+	    if (!canonicalURL) canonicalURL = window.location.href;
+	    //Assign script content. Replace current URL with the canonical URL
+      !function(){var e=/([http|https]:\/\/[a-zA-Z0-9\_\.]+\.baidu\.com)/gi,r=canonicalURL,t=document.referrer;if(!e.test(r)){var n=(String(curProtocol).toLowerCase() === 'https')?"https://sp0.baidu.com/9_Q4simg2RQJ8t7jm9iCKT-xh_/s.gif":"//api.share.baidu.com/s.gif";t?(n+="?r="+encodeURIComponent(document.referrer),r&&(n+="&l="+r)):r&&(n+="?l="+r);var i=new Image;i.src=n}}(window);})();
+  </script>
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+  <script src="//cdn.jsdelivr.net/npm/quicklink@1/dist/quicklink.umd.js"></script>
+  <script>
+      window.addEventListener('load', () => {
+      quicklink({
+        timeout : 3000,
+        priority: true,
+        ignores : [uri => uri.includes('#'),uri => uri === 'https://nicksxs.me/2021/01/03/%E8%81%8A%E8%81%8A-Java-%E7%9A%84-equals-%E5%92%8C-hashCode-%E6%96%B9%E6%B3%95/',]
+      });
+      });
+  </script>
+
+<script>
+  function loadCount() {
+    var d = document, s = d.createElement('script');
+    s.src = 'https://nicksxs.disqus.com/count.js';
+    s.id = 'dsq-count-scr';
+    (d.head || d.body).appendChild(s);
+  }
+  // defer loading until the whole page loading is completed
+  window.addEventListener('load', loadCount, false);
+</script>
+<script>
+  var disqus_config = function() {
+    this.page.url = "https://nicksxs.me/2021/01/03/%E8%81%8A%E8%81%8A-Java-%E7%9A%84-equals-%E5%92%8C-hashCode-%E6%96%B9%E6%B3%95/";
+    this.page.identifier = "2021/01/03/聊聊-Java-的-equals-和-hashCode-方法/";
+    this.page.title = "聊聊 Java 的 equals 和 hashCode 方法";
+    };
+  NexT.utils.loadComments(document.querySelector('#disqus_thread'), () => {
+    if (window.DISQUS) {
+      DISQUS.reset({
+        reload: true,
+        config: disqus_config
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+      var d = document, s = d.createElement('script');
+      s.src = 'https://nicksxs.disqus.com/embed.js';
+      s.setAttribute('data-timestamp', '' + +new Date());
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diff --git a/404.html b/404.html
index 9ffce5ce31..b0e87a3c3e 100644
--- a/404.html
+++ b/404.html
@@ -320,7 +320,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -395,7 +395,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/404/index.html b/404/index.html
index ee033dfa96..69caf47014 100644
--- a/404/index.html
+++ b/404/index.html
@@ -307,7 +307,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -382,7 +382,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2014/12/index.html b/archives/2014/12/index.html
index 3b677db023..5408d1b46a 100644
--- a/archives/2014/12/index.html
+++ b/archives/2014/12/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -350,7 +350,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -425,7 +425,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2014/index.html b/archives/2014/index.html
index 7266887b03..fcbeed584f 100644
--- a/archives/2014/index.html
+++ b/archives/2014/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -350,7 +350,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -425,7 +425,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2015/01/index.html b/archives/2015/01/index.html
index 020e942a19..715ce25a4a 100644
--- a/archives/2015/01/index.html
+++ b/archives/2015/01/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -350,7 +350,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -425,7 +425,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2015/03/index.html b/archives/2015/03/index.html
index 354feb3ffb..86ae285ef8 100644
--- a/archives/2015/03/index.html
+++ b/archives/2015/03/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -350,7 +350,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -425,7 +425,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2015/04/index.html b/archives/2015/04/index.html
index 9976711f79..82299398d2 100644
--- a/archives/2015/04/index.html
+++ b/archives/2015/04/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -330,7 +330,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -405,7 +405,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2015/06/index.html b/archives/2015/06/index.html
index 8aa1a01c6c..4e7c804f69 100644
--- a/archives/2015/06/index.html
+++ b/archives/2015/06/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2015/index.html b/archives/2015/index.html
index 0db055a8cb..4fc7fbf0d1 100644
--- a/archives/2015/index.html
+++ b/archives/2015/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -470,7 +470,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -545,7 +545,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2016/07/index.html b/archives/2016/07/index.html
index 2c307a42d4..236870d4ed 100644
--- a/archives/2016/07/index.html
+++ b/archives/2016/07/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2016/08/index.html b/archives/2016/08/index.html
index e707982d84..b091af6050 100644
--- a/archives/2016/08/index.html
+++ b/archives/2016/08/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -330,7 +330,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -405,7 +405,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2016/09/index.html b/archives/2016/09/index.html
index 4472ff01b8..33abe5f6e1 100644
--- a/archives/2016/09/index.html
+++ b/archives/2016/09/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2016/10/index.html b/archives/2016/10/index.html
index d4ffb80ff8..98ca92ad9e 100644
--- a/archives/2016/10/index.html
+++ b/archives/2016/10/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -330,7 +330,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -405,7 +405,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2016/11/index.html b/archives/2016/11/index.html
index 3bb1ea6096..ac739819c6 100644
--- a/archives/2016/11/index.html
+++ b/archives/2016/11/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2016/index.html b/archives/2016/index.html
index 6e150e01b7..085424a46f 100644
--- a/archives/2016/index.html
+++ b/archives/2016/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -430,7 +430,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -505,7 +505,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2017/03/index.html b/archives/2017/03/index.html
index 0bc6cdb29b..5eb6bc596e 100644
--- a/archives/2017/03/index.html
+++ b/archives/2017/03/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2017/04/index.html b/archives/2017/04/index.html
index e330a46e27..26ab4de064 100644
--- a/archives/2017/04/index.html
+++ b/archives/2017/04/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2017/05/index.html b/archives/2017/05/index.html
index 3d69ec84fc..ffd8d68d1c 100644
--- a/archives/2017/05/index.html
+++ b/archives/2017/05/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2017/index.html b/archives/2017/index.html
index 1d970a300f..6c9a393d8f 100644
--- a/archives/2017/index.html
+++ b/archives/2017/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -350,7 +350,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -425,7 +425,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2019/06/index.html b/archives/2019/06/index.html
index eaf3019b1d..e0a1bc1602 100644
--- a/archives/2019/06/index.html
+++ b/archives/2019/06/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2019/09/index.html b/archives/2019/09/index.html
index e9d1315ef6..541c78a650 100644
--- a/archives/2019/09/index.html
+++ b/archives/2019/09/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2019/12/index.html b/archives/2019/12/index.html
index 69762e2023..52ee27876a 100644
--- a/archives/2019/12/index.html
+++ b/archives/2019/12/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -390,7 +390,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -465,7 +465,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2019/index.html b/archives/2019/index.html
index c8cd0f3ab1..5fd49df356 100644
--- a/archives/2019/index.html
+++ b/archives/2019/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -430,7 +430,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -505,7 +505,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/01/index.html b/archives/2020/01/index.html
index 184b7b8e13..56b892a49d 100644
--- a/archives/2020/01/index.html
+++ b/archives/2020/01/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -390,7 +390,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -465,7 +465,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/02/index.html b/archives/2020/02/index.html
index 65bee2527b..0daca3efdf 100644
--- a/archives/2020/02/index.html
+++ b/archives/2020/02/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -370,7 +370,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -445,7 +445,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/03/index.html b/archives/2020/03/index.html
index a68925b0eb..8609311558 100644
--- a/archives/2020/03/index.html
+++ b/archives/2020/03/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -390,7 +390,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -465,7 +465,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/04/index.html b/archives/2020/04/index.html
index bd5eee61c3..cfb1a5240e 100644
--- a/archives/2020/04/index.html
+++ b/archives/2020/04/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -370,7 +370,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -445,7 +445,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/05/index.html b/archives/2020/05/index.html
index e58303650a..945c4bce9d 100644
--- a/archives/2020/05/index.html
+++ b/archives/2020/05/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -390,7 +390,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -465,7 +465,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/06/index.html b/archives/2020/06/index.html
index 8b83cebe50..f1279fa8e9 100644
--- a/archives/2020/06/index.html
+++ b/archives/2020/06/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -370,7 +370,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -445,7 +445,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/07/index.html b/archives/2020/07/index.html
index e308637137..6ac35f2f03 100644
--- a/archives/2020/07/index.html
+++ b/archives/2020/07/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -370,7 +370,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -445,7 +445,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/08/index.html b/archives/2020/08/index.html
index c1e5262c01..5bf59b51eb 100644
--- a/archives/2020/08/index.html
+++ b/archives/2020/08/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -390,7 +390,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -465,7 +465,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/09/index.html b/archives/2020/09/index.html
index 96f2c67b63..7d6670d929 100644
--- a/archives/2020/09/index.html
+++ b/archives/2020/09/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -370,7 +370,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -445,7 +445,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/10/index.html b/archives/2020/10/index.html
index fbb44ccb99..872c89ec31 100644
--- a/archives/2020/10/index.html
+++ b/archives/2020/10/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -370,7 +370,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -445,7 +445,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
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diff --git a/archives/2020/11/index.html b/archives/2020/11/index.html
index 730abb1d3d..27e7ab04e0 100644
--- a/archives/2020/11/index.html
+++ b/archives/2020/11/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -390,7 +390,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -465,7 +465,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/12/index.html b/archives/2020/12/index.html
index 9431a66f60..99c95e41ac 100644
--- a/archives/2020/12/index.html
+++ b/archives/2020/12/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -370,7 +370,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -445,7 +445,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/index.html b/archives/2020/index.html
index ba6afdd287..249ff2bcb4 100644
--- a/archives/2020/index.html
+++ b/archives/2020/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -493,7 +493,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -568,7 +568,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/page/2/index.html b/archives/2020/page/2/index.html
index ebe6ed034e..022a077cb6 100644
--- a/archives/2020/page/2/index.html
+++ b/archives/2020/page/2/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -493,7 +493,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -568,7 +568,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
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diff --git a/archives/2020/page/3/index.html b/archives/2020/page/3/index.html
index 4a9133f8cf..a3424a2191 100644
--- a/archives/2020/page/3/index.html
+++ b/archives/2020/page/3/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -493,7 +493,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -568,7 +568,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
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diff --git a/archives/2020/page/4/index.html b/archives/2020/page/4/index.html
index 0b84907b1c..515545a9dd 100644
--- a/archives/2020/page/4/index.html
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@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -493,7 +493,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -568,7 +568,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
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diff --git a/archives/2020/page/5/index.html b/archives/2020/page/5/index.html
index 3e1f1c696e..272f6ad92d 100644
--- a/archives/2020/page/5/index.html
+++ b/archives/2020/page/5/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -493,7 +493,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -568,7 +568,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/2020/page/6/index.html b/archives/2020/page/6/index.html
index 35110b471d..cb48223deb 100644
--- a/archives/2020/page/6/index.html
+++ b/archives/2020/page/6/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -353,7 +353,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
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@@ -428,7 +428,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
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     <i class="fa fa-heart"></i>
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new file mode 100644
index 0000000000..1e54e578be
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+<meta property="article:tag" content="Nicksxs">
+<meta property="article:tag" content="史学森">
+<meta property="article:tag" content="米方方">
+<meta property="article:tag" content="米方方的男朋友">
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rel="tag">美国</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/" rel="tag">自适应拓展</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/" rel="tag">设计模式</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%AF%BB%E5%90%8E%E6%84%9F/" rel="tag">读后感</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%B7%91%E6%AD%A5/" rel="tag">跑步</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%BD%AC%E4%B9%89/" rel="tag">转义</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%BF%90%E5%8A%A8/" rel="tag">运动</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a 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diff --git a/archives/2021/index.html b/archives/2021/index.html
new file mode 100644
index 0000000000..a982ac2689
--- /dev/null
+++ b/archives/2021/index.html
@@ -0,0 +1,594 @@
+<!DOCTYPE html>
+<html lang="zh-Hans">
+<head>
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+<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
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+  <link rel="icon" type="image/png" sizes="16x16" href="/images/favicon-16x16-next.png">
+  <link rel="mask-icon" href="/images/logo.svg" color="#222">
+  <meta name="google-site-verification" content="2X6S9P7CAjXjVvw8YyQR8pCu-B0oEu7O9quLgxXuWyA">
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+<link rel="stylesheet" href="//fonts.loli.net/css?family=Lato:300,300italic,400,400italic,700,700italic|M+ 2p:300,300italic,400,400italic,700,700italic&display=swap&subset=latin,latin-ext">
+<link rel="stylesheet" href="/lib/font-awesome/css/all.min.css">
+  <link rel="stylesheet" href="//cdn.jsdelivr.net/gh/fancyapps/fancybox@3/dist/jquery.fancybox.min.css">
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+
+</body>
+</html>
diff --git a/archives/index.html b/archives/index.html
index 5416d0ff26..5ec6c531f9 100644
--- a/archives/index.html
+++ b/archives/index.html
@@ -208,10 +208,33 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
+    <div class="collection-year">
+      <span class="collection-header">2021</span>
+    </div>
+
+  <article itemscope itemtype="http://schema.org/Article">
+    <header class="post-header">
+
+      <div class="post-meta">
+        <time itemprop="dateCreated"
+              datetime="2021-01-03T22:26:35+08:00"
+              content="2021-01-03">
+          01-03
+        </time>
+      </div>
+
+      <div class="post-title">
+          <a class="post-title-link" href="/2021/01/03/%E8%81%8A%E8%81%8A-Java-%E7%9A%84-equals-%E5%92%8C-hashCode-%E6%96%B9%E6%B3%95/" itemprop="url">
+            <span itemprop="name">聊聊 Java 的 equals 和 hashCode 方法</span>
+          </a>
+      </div>
+
+    </header>
+  </article>
     <div class="collection-year">
       <span class="collection-header">2020</span>
     </div>
@@ -396,26 +419,6 @@
     </header>
   </article>
 
-  <article itemscope itemtype="http://schema.org/Article">
-    <header class="post-header">
-
-      <div class="post-meta">
-        <time itemprop="dateCreated"
-              datetime="2020-10-25T23:43:29+08:00"
-              content="2020-10-25">
-          10-25
-        </time>
-      </div>
-
-      <div class="post-title">
-          <a class="post-title-link" href="/2020/10/25/Leetcode-104-%E4%BA%8C%E5%8F%89%E6%A0%91%E7%9A%84%E6%9C%80%E5%A4%A7%E6%B7%B1%E5%BA%A6-Maximum-Depth-of-Binary-Tree-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" itemprop="url">
-            <span itemprop="name">Leetcode 104 二叉树的最大深度(Maximum Depth of Binary Tree) 题解分析</span>
-          </a>
-      </div>
-
-    </header>
-  </article>
-
 
     </div>
   </div>
@@ -493,7 +496,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -568,7 +571,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/page/2/index.html b/archives/page/2/index.html
index 5568108fa1..2f33a72530 100644
--- a/archives/page/2/index.html
+++ b/archives/page/2/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -216,6 +216,26 @@
       <span class="collection-header">2020</span>
     </div>
 
+  <article itemscope itemtype="http://schema.org/Article">
+    <header class="post-header">
+
+      <div class="post-meta">
+        <time itemprop="dateCreated"
+              datetime="2020-10-25T23:43:29+08:00"
+              content="2020-10-25">
+          10-25
+        </time>
+      </div>
+
+      <div class="post-title">
+          <a class="post-title-link" href="/2020/10/25/Leetcode-104-%E4%BA%8C%E5%8F%89%E6%A0%91%E7%9A%84%E6%9C%80%E5%A4%A7%E6%B7%B1%E5%BA%A6-Maximum-Depth-of-Binary-Tree-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" itemprop="url">
+            <span itemprop="name">Leetcode 104 二叉树的最大深度(Maximum Depth of Binary Tree) 题解分析</span>
+          </a>
+      </div>
+
+    </header>
+  </article>
+
   <article itemscope itemtype="http://schema.org/Article">
     <header class="post-header">
 
@@ -396,26 +416,6 @@
     </header>
   </article>
 
-  <article itemscope itemtype="http://schema.org/Article">
-    <header class="post-header">
-
-      <div class="post-meta">
-        <time itemprop="dateCreated"
-              datetime="2020-08-16T23:01:09+08:00"
-              content="2020-08-16">
-          08-16
-        </time>
-      </div>
-
-      <div class="post-title">
-          <a class="post-title-link" href="/2020/08/16/%E5%91%A8%E6%9C%AB%E6%88%91%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/" itemprop="url">
-            <span itemprop="name">周末我在老丈人家打了天小工</span>
-          </a>
-      </div>
-
-    </header>
-  </article>
-
 
     </div>
   </div>
@@ -493,7 +493,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -568,7 +568,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/page/3/index.html b/archives/page/3/index.html
index e5b4deb014..4a0a36e36f 100644
--- a/archives/page/3/index.html
+++ b/archives/page/3/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -216,6 +216,26 @@
       <span class="collection-header">2020</span>
     </div>
 
+  <article itemscope itemtype="http://schema.org/Article">
+    <header class="post-header">
+
+      <div class="post-meta">
+        <time itemprop="dateCreated"
+              datetime="2020-08-16T23:01:09+08:00"
+              content="2020-08-16">
+          08-16
+        </time>
+      </div>
+
+      <div class="post-title">
+          <a class="post-title-link" href="/2020/08/16/%E5%91%A8%E6%9C%AB%E6%88%91%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/" itemprop="url">
+            <span itemprop="name">周末我在老丈人家打了天小工</span>
+          </a>
+      </div>
+
+    </header>
+  </article>
+
   <article itemscope itemtype="http://schema.org/Article">
     <header class="post-header">
 
@@ -396,26 +416,6 @@
     </header>
   </article>
 
-  <article itemscope itemtype="http://schema.org/Article">
-    <header class="post-header">
-
-      <div class="post-meta">
-        <time itemprop="dateCreated"
-              datetime="2020-06-06T22:39:38+08:00"
-              content="2020-06-06">
-          06-06
-        </time>
-      </div>
-
-      <div class="post-title">
-          <a class="post-title-link" href="/2020/06/06/%E8%81%8A%E8%81%8A-Dubbo-%E7%9A%84-SPI-%E7%BB%AD%E4%B9%8B%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/" itemprop="url">
-            <span itemprop="name">聊聊 Dubbo 的 SPI 续之自适应拓展</span>
-          </a>
-      </div>
-
-    </header>
-  </article>
-
 
     </div>
   </div>
@@ -493,7 +493,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -568,7 +568,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/page/4/index.html b/archives/page/4/index.html
index 7409134a62..60d83680a7 100644
--- a/archives/page/4/index.html
+++ b/archives/page/4/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -216,6 +216,26 @@
       <span class="collection-header">2020</span>
     </div>
 
+  <article itemscope itemtype="http://schema.org/Article">
+    <header class="post-header">
+
+      <div class="post-meta">
+        <time itemprop="dateCreated"
+              datetime="2020-06-06T22:39:38+08:00"
+              content="2020-06-06">
+          06-06
+        </time>
+      </div>
+
+      <div class="post-title">
+          <a class="post-title-link" href="/2020/06/06/%E8%81%8A%E8%81%8A-Dubbo-%E7%9A%84-SPI-%E7%BB%AD%E4%B9%8B%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/" itemprop="url">
+            <span itemprop="name">聊聊 Dubbo 的 SPI 续之自适应拓展</span>
+          </a>
+      </div>
+
+    </header>
+  </article>
+
   <article itemscope itemtype="http://schema.org/Article">
     <header class="post-header">
 
@@ -396,26 +416,6 @@
     </header>
   </article>
 
-  <article itemscope itemtype="http://schema.org/Article">
-    <header class="post-header">
-
-      <div class="post-meta">
-        <time itemprop="dateCreated"
-              datetime="2020-03-29T21:48:50+08:00"
-              content="2020-03-29">
-          03-29
-        </time>
-      </div>
-
-      <div class="post-title">
-          <a class="post-title-link" href="/2020/03/29/echo%E5%91%BD%E4%BB%A4%E7%9A%84%E4%B8%80%E4%B8%AA%E5%B0%8F%E6%8A%80%E5%B7%A7/" itemprop="url">
-            <span itemprop="name">docker使用中发现的echo命令的一个小技巧及其他</span>
-          </a>
-      </div>
-
-    </header>
-  </article>
-
 
     </div>
   </div>
@@ -493,7 +493,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -568,7 +568,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/page/5/index.html b/archives/page/5/index.html
index 3f84331f46..47608ba07f 100644
--- a/archives/page/5/index.html
+++ b/archives/page/5/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -216,6 +216,26 @@
       <span class="collection-header">2020</span>
     </div>
 
+  <article itemscope itemtype="http://schema.org/Article">
+    <header class="post-header">
+
+      <div class="post-meta">
+        <time itemprop="dateCreated"
+              datetime="2020-03-29T21:48:50+08:00"
+              content="2020-03-29">
+          03-29
+        </time>
+      </div>
+
+      <div class="post-title">
+          <a class="post-title-link" href="/2020/03/29/echo%E5%91%BD%E4%BB%A4%E7%9A%84%E4%B8%80%E4%B8%AA%E5%B0%8F%E6%8A%80%E5%B7%A7/" itemprop="url">
+            <span itemprop="name">docker使用中发现的echo命令的一个小技巧及其他</span>
+          </a>
+      </div>
+
+    </header>
+  </article>
+
   <article itemscope itemtype="http://schema.org/Article">
     <header class="post-header">
 
@@ -396,26 +416,6 @@
     </header>
   </article>
 
-  <article itemscope itemtype="http://schema.org/Article">
-    <header class="post-header">
-
-      <div class="post-meta">
-        <time itemprop="dateCreated"
-              datetime="2020-01-20T01:02:48+08:00"
-              content="2020-01-20">
-          01-20
-        </time>
-      </div>
-
-      <div class="post-title">
-          <a class="post-title-link" href="/2020/01/20/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%BA%94/" itemprop="url">
-            <span itemprop="name">redis数据结构介绍五-第五部分 对象</span>
-          </a>
-      </div>
-
-    </header>
-  </article>
-
 
     </div>
   </div>
@@ -493,7 +493,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -568,7 +568,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/page/6/index.html b/archives/page/6/index.html
index 2a14153222..3252e62110 100644
--- a/archives/page/6/index.html
+++ b/archives/page/6/index.html
@@ -208,7 +208,7 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
@@ -216,6 +216,26 @@
       <span class="collection-header">2020</span>
     </div>
 
+  <article itemscope itemtype="http://schema.org/Article">
+    <header class="post-header">
+
+      <div class="post-meta">
+        <time itemprop="dateCreated"
+              datetime="2020-01-20T01:02:48+08:00"
+              content="2020-01-20">
+          01-20
+        </time>
+      </div>
+
+      <div class="post-title">
+          <a class="post-title-link" href="/2020/01/20/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%BA%94/" itemprop="url">
+            <span itemprop="name">redis数据结构介绍五-第五部分 对象</span>
+          </a>
+      </div>
+
+    </header>
+  </article>
+
   <article itemscope itemtype="http://schema.org/Article">
     <header class="post-header">
 
@@ -399,26 +419,6 @@
     </header>
   </article>
 
-  <article itemscope itemtype="http://schema.org/Article">
-    <header class="post-header">
-
-      <div class="post-meta">
-        <time itemprop="dateCreated"
-              datetime="2019-06-18T19:03:05+08:00"
-              content="2019-06-18">
-          06-18
-        </time>
-      </div>
-
-      <div class="post-title">
-          <a class="post-title-link" href="/2019/06/18/openresty/" itemprop="url">
-            <span itemprop="name">openresty</span>
-          </a>
-      </div>
-
-    </header>
-  </article>
-
 
     </div>
   </div>
@@ -496,7 +496,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -571,7 +571,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/page/7/index.html b/archives/page/7/index.html
index 0c08db0312..e32ecddd46 100644
--- a/archives/page/7/index.html
+++ b/archives/page/7/index.html
@@ -208,10 +208,33 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
+    <div class="collection-year">
+      <span class="collection-header">2019</span>
+    </div>
+
+  <article itemscope itemtype="http://schema.org/Article">
+    <header class="post-header">
+
+      <div class="post-meta">
+        <time itemprop="dateCreated"
+              datetime="2019-06-18T19:03:05+08:00"
+              content="2019-06-18">
+          06-18
+        </time>
+      </div>
+
+      <div class="post-title">
+          <a class="post-title-link" href="/2019/06/18/openresty/" itemprop="url">
+            <span itemprop="name">openresty</span>
+          </a>
+      </div>
+
+    </header>
+  </article>
     <div class="collection-year">
       <span class="collection-header">2017</span>
     </div>
@@ -399,26 +422,6 @@
     </header>
   </article>
 
-  <article itemscope itemtype="http://schema.org/Article">
-    <header class="post-header">
-
-      <div class="post-meta">
-        <time itemprop="dateCreated"
-              datetime="2016-07-13T22:59:23+08:00"
-              content="2016-07-13">
-          07-13
-        </time>
-      </div>
-
-      <div class="post-title">
-          <a class="post-title-link" href="/2016/07/13/swoole-websocket-test/" itemprop="url">
-            <span itemprop="name">swoole-websocket-test</span>
-          </a>
-      </div>
-
-    </header>
-  </article>
-
 
     </div>
   </div>
@@ -496,7 +499,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -571,7 +574,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/archives/page/8/index.html b/archives/page/8/index.html
index c9a1585a9f..2e1f1c13b4 100644
--- a/archives/page/8/index.html
+++ b/archives/page/8/index.html
@@ -208,10 +208,33 @@
     <div class="posts-collapse">
       <div class="collection-title">
         
-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
       </div>
 
       
+    <div class="collection-year">
+      <span class="collection-header">2016</span>
+    </div>
+
+  <article itemscope itemtype="http://schema.org/Article">
+    <header class="post-header">
+
+      <div class="post-meta">
+        <time itemprop="dateCreated"
+              datetime="2016-07-13T22:59:23+08:00"
+              content="2016-07-13">
+          07-13
+        </time>
+      </div>
+
+      <div class="post-title">
+          <a class="post-title-link" href="/2016/07/13/swoole-websocket-test/" itemprop="url">
+            <span itemprop="name">swoole-websocket-test</span>
+          </a>
+      </div>
+
+    </header>
+  </article>
     <div class="collection-year">
       <span class="collection-header">2015</span>
     </div>
@@ -395,29 +418,6 @@
 
     </header>
   </article>
-    <div class="collection-year">
-      <span class="collection-header">2014</span>
-    </div>
-
-  <article itemscope itemtype="http://schema.org/Article">
-    <header class="post-header">
-
-      <div class="post-meta">
-        <time itemprop="dateCreated"
-              datetime="2014-12-30T16:50:01+08:00"
-              content="2014-12-30">
-          12-30
-        </time>
-      </div>
-
-      <div class="post-title">
-          <a class="post-title-link" href="/2014/12/30/Clone-Graph-Part-I/" itemprop="url">
-            <span itemprop="name">Clone Graph Part I</span>
-          </a>
-      </div>
-
-    </header>
-  </article>
 
 
     </div>
@@ -496,7 +496,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
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-        <span class="collection-header">Good! 82 posts in total. Keep on posting.</span>
+        <span class="collection-header">Good! 83 posts in total. Keep on posting.</span>
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@@ -216,6 +216,26 @@
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+
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+        <time itemprop="dateCreated"
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+              content="2014-12-30">
+          12-30
+        </time>
+      </div>
+
+      <div class="post-title">
+          <a class="post-title-link" href="/2014/12/30/Clone-Graph-Part-I/" itemprop="url">
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+
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+    <published>2021-01-03T14:26:35.000Z</published>
+    <updated>2021-01-03T14:26:35.828Z</updated>
+    
+    <summary type="html">
+    
+      
+      
+        
+        
+          &lt;p&gt;Java 中的这个话题也是比较常遇到的，关于这块原先也是比较忽略的，但是仔细想想又有点遗忘了就在这里记一下&lt;br&gt;简单看下代码&lt;br&gt;&lt;code&gt;java.lang.Object#equals&lt;/code&gt;&lt;/p&gt;
+&lt;figure class=&quot;highlight
+        
+      
+    
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+          <span class="site-state-item-count">83</span>
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-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
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diff --git a/categories/生活/年终总结/2019/index.html b/categories/生活/年终总结/2019/index.html
index 566a46dcd3..49950a6648 100644
--- a/categories/生活/年终总结/2019/index.html
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@@ -310,7 +310,7 @@
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-          <span class="site-state-item-count">82</span>
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-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
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diff --git a/categories/生活/年终总结/index.html b/categories/生活/年终总结/index.html
index 2718ce4e75..f339853ddc 100644
--- a/categories/生活/年终总结/index.html
+++ b/categories/生活/年终总结/index.html
@@ -310,7 +310,7 @@
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-          <span class="site-state-item-count">82</span>
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 <div class="copyright">
   
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-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
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   </span>
diff --git a/categories/生活/影评/2020/index.html b/categories/生活/影评/2020/index.html
index fd42ab821b..0624df65af 100644
--- a/categories/生活/影评/2020/index.html
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-          <span class="site-state-item-count">82</span>
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 <div class="copyright">
   
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-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
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   </span>
diff --git a/categories/生活/影评/index.html b/categories/生活/影评/index.html
index 1a239e6eff..524e59be6f 100644
--- a/categories/生活/影评/index.html
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@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
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         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/categories/生活/运动/index.html b/categories/生活/运动/index.html
index 8282add920..ba74d7c327 100644
--- a/categories/生活/运动/index.html
+++ b/categories/生活/运动/index.html
@@ -410,7 +410,7 @@
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-          <span class="site-state-item-count">82</span>
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@@ -485,7 +485,7 @@
 <div class="copyright">
   
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-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
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   </span>
diff --git a/categories/生活/运动/跑步/index.html b/categories/生活/运动/跑步/index.html
index 15be6e345d..4c280892d0 100644
--- a/categories/生活/运动/跑步/index.html
+++ b/categories/生活/运动/跑步/index.html
@@ -410,7 +410,7 @@
       <div class="site-state-item site-state-posts">
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-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
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         </a>
       </div>
@@ -485,7 +485,7 @@
 <div class="copyright">
   
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-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
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     <i class="fa fa-heart"></i>
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diff --git a/categories/生活/运动/跑步/干活/index.html b/categories/生活/运动/跑步/干活/index.html
index 4ba462c2ea..a536c1e8f6 100644
--- a/categories/生活/运动/跑步/干活/index.html
+++ b/categories/生活/运动/跑步/干活/index.html
@@ -390,7 +390,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
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         </a>
       </div>
@@ -465,7 +465,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/categories/读后感/index.html b/categories/读后感/index.html
index 6f729caa36..7147fa3689 100644
--- a/categories/读后感/index.html
+++ b/categories/读后感/index.html
@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/categories/读后感/村上春树/index.html b/categories/读后感/村上春树/index.html
index c6613850c9..2e866edcc9 100644
--- a/categories/读后感/村上春树/index.html
+++ b/categories/读后感/村上春树/index.html
@@ -310,7 +310,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
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         </a>
       </div>
@@ -385,7 +385,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/categories/问题排查/index.html b/categories/问题排查/index.html
index 92c2daf3c7..7aecfcd15c 100644
--- a/categories/问题排查/index.html
+++ b/categories/问题排查/index.html
@@ -330,7 +330,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
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         </a>
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@@ -405,7 +405,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/css/main.css b/css/main.css
index d2fa347e57..223f03000b 100644
--- a/css/main.css
+++ b/css/main.css
@@ -1261,7 +1261,7 @@ pre .javascript .function {
 }
 .links-of-author a::before,
 .links-of-author span.exturl::before {
-  background: #3cafff;
+  background: #6cffff;
   border-radius: 50%;
   content: ' ';
   display: inline-block;
diff --git a/index.html b/index.html
index cfe8435674..38091bf6a0 100644
--- a/index.html
+++ b/index.html
@@ -203,6 +203,91 @@
       
   
   
+  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2021/01/03/%E8%81%8A%E8%81%8A-Java-%E7%9A%84-equals-%E5%92%8C-hashCode-%E6%96%B9%E6%B3%95/">
+
+    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
+      <meta itemprop="image" content="/uploads/avatar.jpg">
+      <meta itemprop="name" content="Nicksxs">
+      <meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森">
+    </span>
+
+    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
+      <meta itemprop="name" content="Nicksxs's Blog">
+    </span>
+      <header class="post-header">
+        <h2 class="post-title" itemprop="name headline">
+          
+            <a href="/2021/01/03/%E8%81%8A%E8%81%8A-Java-%E7%9A%84-equals-%E5%92%8C-hashCode-%E6%96%B9%E6%B3%95/" class="post-title-link" itemprop="url">聊聊 Java 的 equals 和 hashCode 方法</a>
+        </h2>
+
+        <div class="post-meta">
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
+                <i class="far fa-calendar"></i>
+              </span>
+              <span class="post-meta-item-text">Posted on</span>
+
+              <time title="Created: 2021-01-03 22:26:35" itemprop="dateCreated datePublished" datetime="2021-01-03T22:26:35+08:00">2021-01-03</time>
+            </span>
+
+          
+            <span id="/2021/01/03/%E8%81%8A%E8%81%8A-Java-%E7%9A%84-equals-%E5%92%8C-hashCode-%E6%96%B9%E6%B3%95/" class="post-meta-item leancloud_visitors" data-flag-title="聊聊 Java 的 equals 和 hashCode 方法" title="Views">
+              <span class="post-meta-item-icon">
+                <i class="fa fa-eye"></i>
+              </span>
+              <span class="post-meta-item-text">Views: </span>
+              <span class="leancloud-visitors-count"></span>
+            </span>
+  
+  <span class="post-meta-item">
+    
+      <span class="post-meta-item-icon">
+        <i class="far fa-comment"></i>
+      </span>
+      <span class="post-meta-item-text">Disqus: </span>
+    
+    <a title="disqus" href="/2021/01/03/%E8%81%8A%E8%81%8A-Java-%E7%9A%84-equals-%E5%92%8C-hashCode-%E6%96%B9%E6%B3%95/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/01/03/聊聊-Java-的-equals-和-hashCode-方法/" itemprop="commentCount"></span>
+    </a>
+  </span>
+  
+  
+
+        </div>
+      </header>
+
+    
+    
+    
+    <div class="post-body" itemprop="articleBody">
+
+      
+          <p>Java 中的这个话题也是比较常遇到的，关于这块原先也是比较忽略的，但是仔细想想又有点遗忘了就在这里记一下<br>简单看下代码<br><code>java.lang.Object#equals</code></p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">equals</span><span class="params">(Object obj)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> (<span class="keyword">this</span> == obj);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
+<p>对于所有对象的父类，<code>equals</code> 方法其实对比的就是对象的地址，也就是是否是同一个对象，试想如果像 Integer 或者 String 这种，我们没有重写 <code>equals</code>，那其实就等于是在用<code>==</code>，可能就没法达到我们的目的，所以像 String 这种常用的 jdk 类都是默认重写了<br><code>java.lang.String#equals</code></p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">equals</span><span class="params">(Object anObject)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (<span class="keyword">this</span> == anObject) &#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">if</span> (anObject <span class="keyword">instanceof</span> String) &#123;</span><br><span class="line">            String anotherString = (String)anObject;</span><br><span class="line">            <span class="keyword">int</span> n = value.length;</span><br><span class="line">            <span class="keyword">if</span> (n == anotherString.value.length) &#123;</span><br><span class="line">                <span class="keyword">char</span> v1[] = value;</span><br><span class="line">                <span class="keyword">char</span> v2[] = anotherString.value;</span><br><span class="line">                <span class="keyword">int</span> i = <span class="number">0</span>;</span><br><span class="line">                <span class="keyword">while</span> (n-- != <span class="number">0</span>) &#123;</span><br><span class="line">                    <span class="keyword">if</span> (v1[i] != v2[i])</span><br><span class="line">                        <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">                    i++;</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
+<p>然后呢就是为啥一些书或者 <code>effective java</code> 中写了 <code>equals</code> 跟 <code>hashCode</code> 要一起重写，这里涉及到当对象作为 <code>HashMap</code> 的 <code>key</code> 的时候<br>首先 <code>HashMap</code> 会使用 <code>hashCode</code> 去判断是否在同一个槽里，然后在通过 <code>equals</code> 去判断是否是同一个 <code>key</code>，是的话就替换，不是的话就链表接下去，如果不重写 <code>hashCode</code> 的话，默认的 <code>object</code> 的<code>hashCode</code> 是 <code>native</code> 方法，根据对象的地址生成的，这样其实对象的值相同的话，因为地址不同，<code>HashMap</code> 也会出现异常，所以需要重写，同时也需要重写 <code>equals</code> 方法，才能确认是同一个 <code>key</code>，而不是落在同一个槽的不同 <code>key</code>.</p>
+
+      
+    </div>
+
+    
+    
+    
+      
+
+      <footer class="post-footer">
+        <div class="post-eof"></div>
+      </footer>
+  </article>
+  
+  
+  
+
+      
+  
+  
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
     <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/12/27/%E8%81%8A%E8%81%8A-mysql-%E7%B4%A2%E5%BC%95%E7%9A%84%E4%B8%80%E4%BA%9B%E7%BB%86%E8%8A%82/">
 
@@ -251,11 +336,11 @@
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/C/Mysql/" itemprop="url" rel="index"><span itemprop="name">Mysql</span></a>
+                  <a href="/categories/Mysql/%E7%B4%A2%E5%BC%95/" itemprop="url" rel="index"><span itemprop="name">索引</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Mysql/%E7%B4%A2%E5%BC%95/" itemprop="url" rel="index"><span itemprop="name">索引</span></a>
+                  <a href="/categories/C/Mysql/" itemprop="url" rel="index"><span itemprop="name">Mysql</span></a>
                 </span>
             </span>
 
@@ -661,108 +746,6 @@
   
   
 
-      
-  
-  
-  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/11/29/%E4%BB%8E%E6%B8%85%E5%8D%8E%E7%BE%8E%E9%99%A2%E5%AD%A6%E5%A7%90%E8%81%8A%E8%81%8A%E6%88%91%E4%BB%AC%E8%BA%AB%E8%BE%B9%E7%9A%84%E6%81%B6%E4%BA%BA/">
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-        </h2>
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-              <span class="post-meta-item-icon">
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-              <span class="post-meta-item-text">Posted on</span>
-
-              <time title="Created: 2020-11-29 23:55:41" itemprop="dateCreated datePublished" datetime="2020-11-29T23:55:41+08:00">2020-11-29</time>
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-            <span class="post-meta-item">
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-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
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-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
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-          <p>前几天清华美院学姐的热点火了，然后仔细看了下，其实是个学姐诬陷以为其貌不扬的男同学摸她屁股<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/ZovTIK.jpg" alt=""><br>然后还在朋友圈发文想让他社死，我也是挺晚才知道这个词什么意思，然后后面我看到了这个图片，挺有意思的<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/%E6%91%B8%E5%B1%81%E8%82%A1.png" alt=""><br>本来其实也没什么想聊这个的，是在 B 站看了个吐槽这个的，然后刚好晚上乘公交的时候又碰到了有点类似的问题<br>故事描述下，我们从始发站做了公交，这辆公交司机上次碰到过一回，就是会比较关注乘客的佩戴情况，主要考虑到目前国内疫情，然后这次在差不多人都坐满的情况下，可能在提示了三次让车内乘客戴好口罩，但是他指的那个中年女性还是没有反应，司机就转头比较大声指着这个乘客（中年女性）让戴好口罩，然后这个乘客（中年女性）就大声的说“我口罩是滑下来了，你指着我干嘛，你态度这么差，要吃了我一样，我要投诉你”等等，然后可能跟她一块的一个中年女性也是这么帮腔指责司机，比较基本的理解，车子里这么多乘客，假如是处于这位乘客口罩滑下来了而不自知的情况下，司机在提示了三次以后回头指着她说，我想的是没什么问题的，但是这位却反而指责这位司机指着她，并且说是态度差，要吃了她，完全是不可理喻的，并且一直喋喋不休说她口罩滑掉了有什么错，要投诉这个司机，让他可以提前退休了，在其他乘客的劝说下司机准备继续开车时，又口吐芬芳“你个傻<em>，你来打我呀”，真的是让我再次体会到了所谓的恶人先告状的又一完美呈现，后面还有个乘客还是表示要打死司机这个傻</em>，让我有点不明所以，俗话说有人是得理不饶人，前提是得理，这种理亏不饶人真的是挺让人长见识的，试想下，司机在提示三次后，这位乘客还是没有把口罩戴好，如何在不指着这位乘客的情况下能准确的提示到她呢，并且觉得语气态度不好，司机要载着一车的人，因为你这一个乘客不戴好口罩而不能正常出发，有些着急应该很正常吧，可能是平时自己在家里耀武扬威的使唤别人习惯了吧，别人不敢这么大声跟她说话，其实想想这位中年女性应该年纪不会很大，还比较时髦的吧，像一些常见的中年杭州本地人可能是不会说傻*这个词的吧。<br>杭州的公交可能是在二月份疫情还比较严重的时候是要求上车出示健康码，后面比较缓和以后只要求佩戴好口罩，但是在我们小绍兴，目前还是一律要求检验健康码和佩戴口罩，对于疫情中，并且目前阶段国内也时有报出小范围的疫情的情况下，司机尽职要求佩戴好口罩其实也是为了乘客着想，另一种情况如果司机不严格要求，万一车上有个感染者，这位中年女性被传染了，如果能找到这个司机的话，是不是想“打死”这个司机，竟然让感染者上了车，反正她自己是不可能有错的，上来就是对方态度差，要投诉，自己不戴好口罩啥都没错，我就想知道如果因为自己没戴好口罩被感染了，是不是也是司机的错，毕竟没有像仆人那样点头哈腰求着她戴好口罩。<br>再说回来，整个车就她一个人没戴好口罩，并且还有个细节，其实这个乘客是上了车之后就没戴好了，本来上车的时候是戴好的，这种比较有可能是觉得上车的时候司机那看一眼就好了，如果好好戴着口罩，一点事情都没有，唉，纯粹是太气愤了，调理逻辑什么的就忽略吧</p>
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diff --git a/leancloud_counter_security_urls.json b/leancloud_counter_security_urls.json
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--- a/leancloud_counter_security_urls.json
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\ No newline at end of file
+[{"title":"村上春树《1Q84》读后感","url":"/2019/12/18/1Q84读后感/"},{"title":"34_Search_for_a_Range","url":"/2016/08/14/34-Search-for-a-Range/"},{"title":"AbstractQueuedSynchronizer","url":"/2019/09/23/AbstractQueuedSynchronizer/"},{"title":"2019年终总结","url":"/2020/02/01/2019年终总结/"},{"title":"2020年中总结","url":"/2020/07/11/2020年中总结/"},{"title":"add-two-number","url":"/2015/04/14/Add-Two-Number/"},{"title":"Apollo 的 value 注解是怎么自动更新的","url":"/2020/11/01/Apollo-的-value-注解是怎么自动更新的/"},{"title":"G1收集器概述","url":"/2020/02/09/G1收集器概述/"},{"title":"Clone Graph Part I","url":"/2014/12/30/Clone-Graph-Part-I/"},{"title":"Comparator使用小记","url":"/2020/04/05/Comparator使用小记/"},{"title":"Leetcode 104 二叉树的最大深度(Maximum Depth of Binary Tree) 题解分析","url":"/2020/10/25/Leetcode-104-二叉树的最大深度-Maximum-Depth-of-Binary-Tree-题解分析/"},{"title":"Leetcode 2 Add Two Numbers 题解分析","url":"/2020/10/11/Leetcode-2-Add-Two-Numbers-题解分析/"},{"title":"Leetcode 3 Longest Substring Without Repeating Characters 题解分析","url":"/2020/09/20/Leetcode-3-Longest-Substring-Without-Repeating-Characters-题解分析/"},{"title":"leetcode no.3","url":"/2015/04/15/Leetcode-No-3/"},{"title":"Linux 下 grep 命令的一点小技巧","url":"/2020/08/06/Linux-下-grep-命令的一点小技巧/"},{"title":"Leetcode 234 回文链表(Palindrome Linked List) 题解分析","url":"/2020/11/15/Leetcode-234-回文联表-Palindrome-Linked-List-题解分析/"},{"title":"Leetcode 155 最小栈(Min Stack) 题解分析","url":"/2020/12/06/Leetcode-155-最小栈-Min-Stack-题解分析/"},{"title":"Leetcode 105 从前序与中序遍历序列构造二叉树(Construct Binary Tree from Preorder and Inorder Traversal) 题解分析","url":"/2020/12/13/Leetcode-105-从前序与中序遍历序列构造二叉树-Construct-Binary-Tree-from-Preorder-and-Inorder-Traversal-题解分析/"},{"title":"MFC 模态对话框","url":"/2014/12/24/MFC 模态对话框/"},{"title":"Path Sum","url":"/2015/01/04/Path-Sum/"},{"title":"Maven实用小技巧","url":"/2020/02/16/Maven实用小技巧/"},{"title":"Number of 1 Bits","url":"/2015/03/11/Number-Of-1-Bits/"},{"title":"Redis_分布式锁","url":"/2019/12/10/Redis-Part-1/"},{"title":"two sum","url":"/2015/01/14/Two-Sum/"},{"title":"Reverse Integer","url":"/2015/03/13/Reverse-Integer/"},{"title":"Reverse Bits","url":"/2015/03/11/Reverse-Bits/"},{"title":"ambari-summary","url":"/2017/05/09/ambari-summary/"},{"title":"binary-watch","url":"/2016/09/29/binary-watch/"},{"title":"docker-mysql-cluster","url":"/2016/08/14/docker-mysql-cluster/"},{"title":"docker比一般多一点的初学者介绍","url":"/2020/03/08/docker比一般多一点的初学者介绍/"},{"title":"docker比一般多一点的初学者介绍三","url":"/2020/03/21/docker比一般多一点的初学者介绍三/"},{"title":"docker比一般多一点的初学者介绍二","url":"/2020/03/15/docker比一般多一点的初学者介绍二/"},{"title":"docker使用中发现的echo命令的一个小技巧及其他","url":"/2020/03/29/echo命令的一个小技巧/"},{"title":"gogs使用webhook部署react单页应用","url":"/2020/02/22/gogs使用webhook部署react单页应用/"},{"title":"invert-binary-tree","url":"/2015/06/22/invert-binary-tree/"},{"title":"minimum-size-subarray-sum-209","url":"/2016/10/11/minimum-size-subarray-sum-209/"},{"title":"C++ 指针使用中的一个小问题","url":"/2014/12/23/my-new-post/"},{"title":"mybatis 的 $ 和 # 是有啥区别","url":"/2020/09/06/mybatis-的-和-是有啥区别/"},{"title":"php-abstract-class-and-interface","url":"/2016/11/10/php-abstract-class-and-interface/"},{"title":"pcre-intro-and-a-simple-package","url":"/2015/01/16/pcre-intro-and-a-simple-package/"},{"title":"openresty","url":"/2019/06/18/openresty/"},{"title":"rabbitmq-tips","url":"/2017/04/25/rabbitmq-tips/"},{"title":"redis数据结构介绍三-第三部分 整数集合","url":"/2020/01/10/redis数据结构介绍三/"},{"title":"redis数据结构介绍二-第二部分 跳表","url":"/2020/01/04/redis数据结构介绍二/"},{"title":"redis数据结构介绍五-第五部分 对象","url":"/2020/01/20/redis数据结构介绍五/"},{"title":"redis数据结构介绍四-第四部分 压缩表","url":"/2020/01/19/redis数据结构介绍四/"},{"title":"spark-little-tips","url":"/2017/03/28/spark-little-tips/"},{"title":"summary-ranges-228","url":"/2016/10/12/summary-ranges-228/"},{"title":"swoole-websocket-test","url":"/2016/07/13/swoole-websocket-test/"},{"title":"周末我在老丈人家打了天小工","url":"/2020/08/16/周末我在老丈人家打了天小工/"},{"title":"从清华美院学姐聊聊我们身边的恶人","url":"/2020/11/29/从清华美院学姐聊聊我们身边的恶人/"},{"title":"在老丈人家的小工记三","url":"/2020/09/13/在老丈人家的小工记三/"},{"title":"从丁仲礼被美国制裁聊点啥","url":"/2020/12/20/从丁仲礼被美国制裁聊点啥/"},{"title":"在老丈人家的小工记五","url":"/2020/10/18/在老丈人家的小工记五/"},{"title":"在老丈人家的小工记四","url":"/2020/09/26/在老丈人家的小工记四/"},{"title":"寄生虫观后感","url":"/2020/03/01/寄生虫观后感/"},{"title":"我是如何走上跑步这条不归路的","url":"/2020/07/26/我是如何走上跑步这条不归路的/"},{"title":"聊聊 Dubbo 的 SPI 续之自适应拓展","url":"/2020/06/06/聊聊-Dubbo-的-SPI-续之自适应拓展/"},{"title":"聊聊 Dubbo 的 SPI","url":"/2020/05/31/聊聊-Dubbo-的-SPI/"},{"title":"聊聊 Java 的 equals 和 hashCode 方法","url":"/2021/01/03/聊聊-Java-的-equals-和-hashCode-方法/"},{"title":"聊聊 Java 的类加载机制一","url":"/2020/11/08/聊聊-Java-的类加载机制/"},{"title":"聊聊 mysql 的 MVCC 续篇","url":"/2020/05/02/聊聊-mysql-的-MVCC-续篇/"},{"title":"聊聊 mysql 的 MVCC 续续篇之锁分析","url":"/2020/05/10/聊聊-mysql-的-MVCC-续续篇之加锁分析/"},{"title":"聊聊 mysql 的 MVCC","url":"/2020/04/26/聊聊-mysql-的-MVCC/"},{"title":"聊聊Java中的单例模式","url":"/2019/12/21/聊聊Java中的单例模式/"},{"title":"聊聊一次 brew update 引发的血案","url":"/2020/06/13/聊聊一次-brew-update-引发的血案/"},{"title":"聊聊我刚学会的应用诊断方法","url":"/2020/05/22/聊聊我刚学会的应用诊断方法/"},{"title":"聊聊 mysql 索引的一些细节","url":"/2020/12/27/聊聊-mysql-索引的一些细节/"},{"title":"这周末我又在老丈人家打了天小工","url":"/2020/08/30/这周末我又在老丈人家打了天小工/"},{"title":"mybatis 的缓存是怎么回事","url":"/2020/10/03/mybatis-的缓存是怎么回事/"},{"title":"redis数据结构介绍-第一部分 SDS，链表，字典","url":"/2019/12/26/redis数据结构介绍/"},{"title":"redis数据结构介绍六 快表","url":"/2020/01/22/redis数据结构介绍六/"},{"title":"介绍一下 RocketMQ","url":"/2020/06/21/介绍一下-RocketMQ/"},{"title":"聊聊 Dubbo 的容错机制","url":"/2020/11/22/聊聊-Dubbo-的容错机制/"},{"title":"聊聊我理解的分布式事务","url":"/2020/05/17/聊聊我理解的分布式事务/"},{"title":"Filter, Interceptor, Aop, 啥, 啥, 啥? 这些都是啥?","url":"/2020/08/22/Filter-Intercepter-Aop-啥-啥-啥-这些都是啥/"},{"title":"redis系列介绍七-过期策略","url":"/2020/04/12/redis系列介绍七/"},{"title":"JVM源码分析之G1垃圾收集器分析一","url":"/2019/12/07/JVM-G1-Part-1/"},{"title":"redis系列介绍八-淘汰策略","url":"/2020/04/18/redis系列介绍八/"},{"title":"聊一下 RocketMQ 的 NameServer 源码","url":"/2020/07/05/聊一下-RocketMQ-的-NameServer-源码/"},{"title":"聊聊 RocketMQ 的 Broker 源码","url":"/2020/07/19/聊聊-RocketMQ-的-Broker-源码/"},{"title":"聊聊 Java 自带的那些*逆天*工具","url":"/2020/08/02/聊聊-Java-自带的那些逆天工具/"},{"title":"聊一下 RocketMQ 的 DefaultMQPushConsumer 源码","url":"/2020/06/26/聊一下-RocketMQ-的-Consumer/"}]
\ No newline at end of file
diff --git a/lib/pace/README.html b/lib/pace/README.html
index a1ffb4ecf9..a760d90210 100644
--- a/lib/pace/README.html
+++ b/lib/pace/README.html
@@ -351,7 +351,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -426,7 +426,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/page/10/index.html b/page/10/index.html
index 07a63038da..02fcd3886e 100644
--- a/page/10/index.html
+++ b/page/10/index.html
@@ -203,6 +203,123 @@
       
   
   
+  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/02/22/gogs%E4%BD%BF%E7%94%A8webhook%E9%83%A8%E7%BD%B2react%E5%8D%95%E9%A1%B5%E5%BA%94%E7%94%A8/">
+
+    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
+      <meta itemprop="image" content="/uploads/avatar.jpg">
+      <meta itemprop="name" content="Nicksxs">
+      <meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森">
+    </span>
+
+    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
+      <meta itemprop="name" content="Nicksxs's Blog">
+    </span>
+      <header class="post-header">
+        <h2 class="post-title" itemprop="name headline">
+          
+            <a href="/2020/02/22/gogs%E4%BD%BF%E7%94%A8webhook%E9%83%A8%E7%BD%B2react%E5%8D%95%E9%A1%B5%E5%BA%94%E7%94%A8/" class="post-title-link" itemprop="url">gogs使用webhook部署react单页应用</a>
+        </h2>
+
+        <div class="post-meta">
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
+                <i class="far fa-calendar"></i>
+              </span>
+              <span class="post-meta-item-text">Posted on</span>
+
+              <time title="Created: 2020-02-22 12:25:25" itemprop="dateCreated datePublished" datetime="2020-02-22T12:25:25+08:00">2020-02-22</time>
+            </span>
+              <span class="post-meta-item">
+                <span class="post-meta-item-icon">
+                  <i class="far fa-calendar-check"></i>
+                </span>
+                <span class="post-meta-item-text">Edited on</span>
+                <time title="Modified: 2020-02-23 17:42:22" itemprop="dateModified" datetime="2020-02-23T17:42:22+08:00">2020-02-23</time>
+              </span>
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
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+              <span class="post-meta-item-text">In</span>
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/%E6%8C%81%E7%BB%AD%E9%9B%86%E6%88%90/" itemprop="url" rel="index"><span itemprop="name">持续集成</span></a>
+                </span>
+            </span>
+
+          
+            <span id="/2020/02/22/gogs%E4%BD%BF%E7%94%A8webhook%E9%83%A8%E7%BD%B2react%E5%8D%95%E9%A1%B5%E5%BA%94%E7%94%A8/" class="post-meta-item leancloud_visitors" data-flag-title="gogs使用webhook部署react单页应用" title="Views">
+              <span class="post-meta-item-icon">
+                <i class="fa fa-eye"></i>
+              </span>
+              <span class="post-meta-item-text">Views: </span>
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+  <span class="post-meta-item">
+    
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+      <span class="post-meta-item-text">Disqus: </span>
+    
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+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/02/22/gogs使用webhook部署react单页应用/" itemprop="commentCount"></span>
+    </a>
+  </span>
+  
+  
+
+        </div>
+      </header>
+
+    
+    
+    
+    <div class="post-body" itemprop="articleBody">
+
+      
+          <p>众所周知，我是个前端彩笔，但是也想做点自己可以用的工具页面，所以就让朋友推荐了蚂蚁出品的 ant design，说基本可以直接 ctrl-c ctrl-v，实测对我这种来说还是有点难的，不过也能写点，但是现在碰到的问题是怎么部署到自己的服务器上去<br>用 ant design 写的是个单页应用，实际来说就是一个 html 加 css 跟 js，最初的时候是直接 build 完就 scp 上去，也考虑过 rsync 之类的，但是都感觉不够自动化，正好自己还没这方面的经验就想折腾下，因为我自己搭的仓库应用是 gogs，搜了一下主要是跟 drones 配合做 ci/cd，研究了一下发现其实这个事情没必要这么搞(PS：drone 也不好用)，整个 hook 就可以了, 但是实际上呢，这东西也不是那么简单<br>首先是需要在服务器上装 <a href="https://github.com/adnanh/webhook" target="_blank" rel="noopener">webhook</a>，这个我一开始用 snap 安装，但是出现问题，run 的时候会出现后面参数带的 hooks.json 文件找不到，然后索性就直接 github 上下最新版，放 /usr/local/bin 了，webhook 的原理呢其实也比较简单，就是起一个 http 服务，通过 post 请求调用，解析下参数，如果跟配置的参数一致，就调用对应的命令或者脚本。</p>
+<h2 id="配置-hooks-json"><a href="#配置-hooks-json" class="headerlink" title="配置 hooks.json"></a>配置 hooks.json</h2><p>webhook 的配置，需要的两个文件，一个是 hooks.json，这个是 webhook 服务的配置文件，像这样</p>
+<figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br></pre></td><td class="code"><pre><span class="line">[</span><br><span class="line">  &#123;</span><br><span class="line">    <span class="attr">"id"</span>: <span class="string">"redeploy-app"</span>,</span><br><span class="line">    <span class="attr">"execute-command"</span>: <span class="string">"/opt/scripts/redeploy.sh"</span>,</span><br><span class="line">    <span class="attr">"command-working-directory"</span>: <span class="string">"/opt/scripts"</span>,</span><br><span class="line">    <span class="attr">"pass-arguments-to-command"</span>:</span><br><span class="line">    [</span><br><span class="line">      &#123;</span><br><span class="line">        <span class="attr">"source"</span>: <span class="string">"payload"</span>,</span><br><span class="line">        <span class="attr">"name"</span>: <span class="string">"head_commit.message"</span></span><br><span class="line">      &#125;,</span><br><span class="line">      &#123;</span><br><span class="line">        <span class="attr">"source"</span>: <span class="string">"payload"</span>,</span><br><span class="line">        <span class="attr">"name"</span>: <span class="string">"pusher.name"</span></span><br><span class="line">      &#125;,</span><br><span class="line">      &#123;</span><br><span class="line">        <span class="attr">"source"</span>: <span class="string">"payload"</span>,</span><br><span class="line">        <span class="attr">"name"</span>: <span class="string">"head_commit.id"</span></span><br><span class="line">      &#125;</span><br><span class="line">    ],</span><br><span class="line">    <span class="attr">"trigger-rule"</span>:</span><br><span class="line">    &#123;</span><br><span class="line">      <span class="attr">"and"</span>:</span><br><span class="line">      [</span><br><span class="line">        &#123;</span><br><span class="line">          <span class="attr">"match"</span>:</span><br><span class="line">          &#123;</span><br><span class="line">            <span class="attr">"type"</span>: <span class="string">"payload-hash-sha1"</span>,</span><br><span class="line">            <span class="attr">"secret"</span>: <span class="string">"your-github-secret"</span>,</span><br><span class="line">            <span class="attr">"parameter"</span>:</span><br><span class="line">            &#123;</span><br><span class="line">              <span class="attr">"source"</span>: <span class="string">"header"</span>,</span><br><span class="line">              <span class="attr">"name"</span>: <span class="string">"X-Hub-Signature"</span></span><br><span class="line">            &#125;</span><br><span class="line">          &#125;</span><br><span class="line">        &#125;,</span><br><span class="line">        &#123;</span><br><span class="line">          <span class="attr">"match"</span>:</span><br><span class="line">          &#123;</span><br><span class="line">            <span class="attr">"type"</span>: <span class="string">"value"</span>,</span><br><span class="line">            <span class="attr">"value"</span>: <span class="string">"refs/heads/master"</span>,</span><br><span class="line">            <span class="attr">"parameter"</span>:</span><br><span class="line">            &#123;</span><br><span class="line">              <span class="attr">"source"</span>: <span class="string">"payload"</span>,</span><br><span class="line">              <span class="attr">"name"</span>: <span class="string">"ref"</span></span><br><span class="line">            &#125;</span><br><span class="line">          &#125;</span><br><span class="line">        &#125;</span><br><span class="line">      ]</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">]</span><br></pre></td></tr></table></figure>
+
+<p>这是个跟 github搭配的示例，首先 id 表示的是这个对应 hook 的识别 id，也可以看到这个 hooks.json 的结构是这样的一个数组，然后就是要执行的命令和命令执行的参数，值得注意的是这个<code>trigger-rule</code>,就是请求进来了回去匹配里面的，比如前一个是一个加密的，放在请求头里，第二个 match 表示请求里的 ref 是个 master 分支，就可以区分分支进行不同操作，但是前面的加密配合 gogs 使用的时候有个问题(PS: webhook 的文档是真的烂)，gogs 设置 webhook 的加密是用的</p>
+<blockquote>
+<p>密钥文本将被用于计算推送内容的 SHA256 HMAC 哈希值，并设置为 <code>X-Gogs-Signature</code> 请求头的值。</p>
+</blockquote>
+<p>这种加密方式，所以 webhook 的这个示例的加密方式不行，但这货的文档里居然没有说明支持哪些加密，神TM，后来还是翻 <a href="https://github.com/adnanh/webhook/issues/289" target="_blank" rel="noopener">issue</a> 翻到了, 需要使用这个<code>payload-hash-sha256</code></p>
+<h2 id="执行脚本-redeploy-sh"><a href="#执行脚本-redeploy-sh" class="headerlink" title="执行脚本 redeploy.sh"></a>执行脚本 redeploy.sh</h2><p>脚本类似于这样</p>
+<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#</span><span class="bash">!/bin/bash -e</span></span><br><span class="line"></span><br><span class="line">function cleanup &#123;</span><br><span class="line">      echo "Error occoured"</span><br><span class="line">&#125;</span><br><span class="line">trap cleanup ERR</span><br><span class="line"></span><br><span class="line">commit_message=$1 # head_commit.message</span><br><span class="line">pusher_name=$2 # pusher.name</span><br><span class="line">commit_id=$3 # head_commit.id</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">cd ~/do-react-example-app/</span><br><span class="line">git pull origin master</span><br><span class="line">yarn &amp;&amp; yarn build</span><br></pre></td></tr></table></figure>
+
+<p>就是简单的拉代码，然后构建下，真实使用时可能不是这样，因为页面会部署在 nginx 的作用目录，还需要 rsync 过去，这部分可能还涉及到两个问题第一个是使用 rsync 还是其他的 cp，不过这个无所谓；第二个是目录权限的问题，以我的系统ubuntu 为例，默认用户是 ubuntu，nginx 部署的目录是 www，所以需要切换用户等操作，一开始是想用在shell 文件中直接写了密码，但是不知道咋传，查了下是类似于这样 <code>echo &quot;passwd&quot; | sudo -S cmd</code>，通过管道命令往后传，然后就是这个<code>-S</code>, 参数的解释是<code>-S, --stdin                 read password from standard input</code>,但是这样么也不是太安全的赶脚，又看了下还有两种方法，</p>
+<ul>
+<li><p>就是给root 设置一个不需要密码的命令类似于这样，</p>
+<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">myusername ALL = (ALL) ALL</span><br><span class="line">myusername ALL = (root) NOPASSWD: /path/to/my/program</span><br></pre></td></tr></table></figure>
+</li>
+<li><p>另一种就是把默认用户跟 root 设置成同一个 group 的</p>
+</li>
+</ul>
+<h2 id="使用"><a href="#使用" class="headerlink" title="使用"></a>使用</h2><p>真正实操的时候其实还有不少问题，首先运行 webhook 就碰到了我前面说的，使用 snap 运行的时候会找不到前面的 hooks.json配置文件，执行<code>snap run webhook -hooks /opt/hooks/hooks.json -verbose</code>就碰到下面的<code>couldn&#39;t load hooks from file! open /opt/hooks/hooks.json: no such file or directory</code>，后来直接下了个官方最新的 release，就直接执行 <code>webhook -hooks /opt/hooks/hooks.json -verbose</code> 就可以了，然后是前面的示例配置文件里的几个参数，比如<code>head_commit.message</code> 其实 gogs 推过来的根本没这玩意，而且都是数组，不知道咋取，烂文档，不过总比搭个 drone 好一点就忍了。补充一点就是在 debug 的时候需要看下问题出在哪，看看脚本有没有执行，所以需要在前面的 json 里加这个参数<code>&quot;include-command-output-in-response&quot;: true</code>, 就能输出来脚本执行结果</p>
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-          <p>前面说了这么些数据结构，其实大家对于 redis 最初的印象应该就是个 key-value 的缓存，类似于 memcache，redis 其实也是个 key-value，key 还是一样的字符串，或者说就是用 redis 自己的动态字符串实现，但是 value 其实就是前面说的那些数据结构，差不多快说完了，还有个 quicklist 后面还有一篇，这里先介绍下 redis 对于这些不同类型的 value 是怎么实现的，首先看下 redisObject 的源码头文件</p>
-<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* The actual Redis Object */</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_STRING 0    <span class="comment">/* String object. */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_LIST 1      <span class="comment">/* List object. */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_SET 2       <span class="comment">/* Set object. */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ZSET 3      <span class="comment">/* Sorted set object. */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_HASH 4      <span class="comment">/* Hash object. */</span></span></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment"> * Objects encoding. Some kind of objects like Strings and Hashes can be</span></span><br><span class="line"><span class="comment"> * internally represented in multiple ways. The 'encoding' field of the object</span></span><br><span class="line"><span class="comment"> * is set to one of this fields for this object. */</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_RAW 0     <span class="comment">/* Raw representation */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_INT 1     <span class="comment">/* Encoded as integer */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_HT 2      <span class="comment">/* Encoded as hash table */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_ZIPMAP 3  <span class="comment">/* Encoded as zipmap */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_LINKEDLIST 4 <span class="comment">/* No longer used: old list encoding. */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_ZIPLIST 5 <span class="comment">/* Encoded as ziplist */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_INTSET 6  <span class="comment">/* Encoded as intset */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_SKIPLIST 7  <span class="comment">/* Encoded as skiplist */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_EMBSTR 8  <span class="comment">/* Embedded sds string encoding */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_QUICKLIST 9 <span class="comment">/* Encoded as linked list of ziplists */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_STREAM 10 <span class="comment">/* Encoded as a radix tree of listpacks */</span></span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> LRU_BITS 24</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> LRU_CLOCK_MAX ((1<span class="meta-string">&lt;&lt;LRU_BITS)-1) /* Max value of obj-&gt;lru */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> LRU_CLOCK_RESOLUTION 1000 <span class="comment">/* LRU clock resolution in ms */</span></span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_SHARED_REFCOUNT INT_MAX</span></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">redisObject</span> &#123;</span></span><br><span class="line">    <span class="keyword">unsigned</span> type:<span class="number">4</span>;</span><br><span class="line">    <span class="keyword">unsigned</span> encoding:<span class="number">4</span>;</span><br><span class="line">    <span class="keyword">unsigned</span> lru:LRU_BITS; <span class="comment">/* LRU time (relative to global lru_clock) or</span></span><br><span class="line"><span class="comment">                            * LFU data (least significant 8 bits frequency</span></span><br><span class="line"><span class="comment">                            * and most significant 16 bits access time). */</span></span><br><span class="line">    <span class="keyword">int</span> refcount;</span><br><span class="line">    <span class="keyword">void</span> *ptr;</span><br><span class="line">&#125; robj;</span><br></pre></td></tr></table></figure>
-<p>主体结构就是这个 redisObject，</p>
-<ul>
-<li>type： 字段表示对象的类型，它对应的就是 redis 的对外暴露的，或者说用户可以使用的五种类型，OBJ_STRING, OBJ_LIST, OBJ_SET, OBJ_ZSET, OBJ_HASH</li>
-<li>encoding： 字段表示这个对象在 redis 内部的编码方式，由OBJ_ENCODING_开头的 11 种</li>
-<li>lru: 做LRU替换算法用，占24个bit</li>
-<li>refcount: 引用计数。它允许robj对象在某些情况下被共享。</li>
-<li>ptr: 指向底层实现数据结构的指针<br>当 type 是 OBJ_STRING 时，表示类型是个 string，它的编码方式 encoding 可能有 OBJ_ENCODING_RAW，OBJ_ENCODING_INT，OBJ_ENCODING_EMBSTR 三种<br>当 type 是 OBJ_LIST 时，表示类型是 list，它的编码方式 encoding 是 OBJ_ENCODING_QUICKLIST，对于早一些的版本，2.2这种可能还会使用 OBJ_ENCODING_ZIPLIST，OBJ_ENCODING_LINKEDLIST<br>当 type 是 OBJ_SET 时，是个集合，但是得看具体元素的类型，有可能使用整数集合，OBJ_ENCODING_INTSET, 如果元素不全是整型或者数量超过一定限制，那么编码就是 OBJ_ENCODING_HT hash table 了<br>当 type 是 OBJ_ZSET 时，是个有序集合，它底层有可能使用的是 OBJ_ENCODING_ZIPLIST 或者 OBJ_ENCODING_SKIPLIST<br>当 type 是 OBJ_HASH 时，一开始也是 OBJ_ENCODING_ZIPLIST，然后当数据量大于 hash_max_ziplist_entries 时会转成 OBJ_ENCODING_HT</li>
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+  <span itemprop="copyrightYear">2021</span>
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+            <a href="/2020/01/20/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%BA%94/" class="post-title-link" itemprop="url">redis数据结构介绍五-第五部分 对象</a>
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-              <time title="Created: 2020-01-19 00:00:22" itemprop="dateCreated datePublished" datetime="2020-01-19T00:00:22+08:00">2020-01-19</time>
+              <time title="Created: 2020-01-20 01:02:48" itemprop="dateCreated datePublished" datetime="2020-01-20T01:02:48+08:00">2020-01-20</time>
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-          <p>在 redis 中还有一类表型数据结构叫压缩表，ziplist，它的目的是替代链表，链表是个很容易理解的数据结构，双向链表有前后指针，有带头结点的有的不带，但是链表有个比较大的问题是相对于普通的数组，它的内存不连续，碎片化的存储，内存利用效率不高，而且指针寻址相对于直接使用偏移量的话，也有一定的效率劣势，当然这不是主要的原因，ziplist 设计的主要目的是让链表的内存使用更高效</p>
-<blockquote>
-<p>The ziplist is a specially encoded dually linked list that is designed to be very memory efficient.<br>这是摘自 redis 源码中ziplist.c 文件的注释，也说明了原因，它的大概结构是这样子</p>
-</blockquote>
-<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;zlbytes&gt; &lt;zltail&gt; &lt;zllen&gt; &lt;entry&gt; &lt;entry&gt; ... &lt;entry&gt; &lt;zlend&gt;</span><br></pre></td></tr></table></figure>
-<p>其中<br><code>&lt;zlbytes&gt;</code>表示 ziplist 占用的字节总数，类型是uint32_t，32 位的无符号整型，当然表示的字节数也包含自己本身占用的 4 个<br><code>&lt;zltail&gt;</code> 类型也是是uint32_t，表示ziplist表中最后一项（entry）在ziplist中的偏移字节数。<code>&lt;zltail&gt;</code>的存在，使得我们可以很方便地找到最后一项（不用遍历整个ziplist），从而可以在ziplist尾端快速地执行push或pop操作。<br><code>&lt;uint16_t zllen&gt;</code> 表示ziplist 中的数据项个数，因为是 16 位，所以当数量超过所能表示的最大的数量，它的 16 位全会置为 1，但是真实的数量需要遍历整个 ziplist 才能知道<br><code>&lt;entry&gt;</code>是具体的数据项，后面解释<br><code>&lt;zlend&gt;</code> ziplist 的最后一个字节，固定是255。<br>再看一下<code>&lt;entry&gt;</code>中的具体结构，</p>
-<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;prevlen&gt; &lt;encoding&gt; &lt;entry-data&gt;</span><br></pre></td></tr></table></figure>
-<p>首先这个<code>&lt;prevlen&gt;</code>有两种情况，一种是前面的元素的长度，如果是小于等于 253的时候就用一个uint8_t 来表示前一元素的长度，如果大于的话他将占用五个字节，第一个字节是 254，即表示这个字节已经表示不下了，需要后面的四个字节帮忙表示<br><code>&lt;encoding&gt;</code>这个就比较复杂，把源码的注释放下面先看下</p>
-<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line">* |00pppppp| - 1 byte</span><br><span class="line">*      String value with length less than or equal to 63 bytes (6 bits).</span><br><span class="line">*      &quot;pppppp&quot; represents the unsigned 6 bit length.</span><br><span class="line">* |01pppppp|qqqqqqqq| - 2 bytes</span><br><span class="line">*      String value with length less than or equal to 16383 bytes (14 bits).</span><br><span class="line">*      IMPORTANT: The 14 bit number is stored in big endian.</span><br><span class="line">* |10000000|qqqqqqqq|rrrrrrrr|ssssssss|tttttttt| - 5 bytes</span><br><span class="line">*      String value with length greater than or equal to 16384 bytes.</span><br><span class="line">*      Only the 4 bytes following the first byte represents the length</span><br><span class="line">*      up to 32^2-1. The 6 lower bits of the first byte are not used and</span><br><span class="line">*      are set to zero.</span><br><span class="line">*      IMPORTANT: The 32 bit number is stored in big endian.</span><br><span class="line">* |11000000| - 3 bytes</span><br><span class="line">*      Integer encoded as int16_t (2 bytes).</span><br><span class="line">* |11010000| - 5 bytes</span><br><span class="line">*      Integer encoded as int32_t (4 bytes).</span><br><span class="line">* |11100000| - 9 bytes</span><br><span class="line">*      Integer encoded as int64_t (8 bytes).</span><br><span class="line">* |11110000| - 4 bytes</span><br><span class="line">*      Integer encoded as 24 bit signed (3 bytes).</span><br><span class="line">* |11111110| - 2 bytes</span><br><span class="line">*      Integer encoded as 8 bit signed (1 byte).</span><br><span class="line">* |1111xxxx| - (with xxxx between 0000 and 1101) immediate 4 bit integer.</span><br><span class="line">*      Unsigned integer from 0 to 12. The encoded value is actually from</span><br><span class="line">*      1 to 13 because 0000 and 1111 can not be used, so 1 should be</span><br><span class="line">*      subtracted from the encoded 4 bit value to obtain the right value.</span><br><span class="line">* |11111111| - End of ziplist special entry.</span><br></pre></td></tr></table></figure>
-<p>首先如果 encoding 的前两位是 00 的话代表这个元素是个 6 位的字符串，即直接将数据保存在 encoding 中，不消耗额外的<code>&lt;entry-data&gt;</code>，如果前两位是 01 的话表示是个 14 位的字符串，如果是 10 的话表示encoding 块之后的四个字节是存放字符串类型的数据，encoding 的剩余 6 位置 0。<br>如果 encoding 的前两位是 11 的话表示这是个整型，具体的如果后两位是00的话，表示后面是个2字节的 int16_t 类型，如果是01的话，后面是个4字节的int32_t,如果是10的话后面是8字节的int64_t,如果是 11 的话后面是 3 字节的有符号整型，这些都要最后 4 位都是 0 的情况噢<br>剩下当是<code>11111110</code>时，则表示是一个1 字节的有符号数，如果是 <code>1111xxxx</code>，其中<code>xxxx</code>在0000 到 1101 表示实际的 1 到 13，为啥呢，因为 0000 前面已经用过了，而 1110 跟 1111 也都有用了。<br>看个具体的例子(上下有点对不齐，将就看)</p>
-<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">[0f 00 00 00] [0c 00 00 00] [02 00] [00 f3] [02 f6] [ff]</span><br><span class="line">|**zlbytes***|  |***zltail***|  |*zllen*|  |entry1 entry2|  |zlend|</span><br></pre></td></tr></table></figure>
-<p>第一部分代表整个 ziplist 有 15 个字节，zlbytes 自己占了 4 个 zltail 表示最后一个元素的偏移量，第 13 个字节起，zllen 表示有 2 个元素，第一个元素是<code>00f3</code>,00表示前一个元素长度是 0，本来前面就没元素(不过不知道这个能不能优化这一字节)，然后是 f3，换成二进制就是11110011,对照上面的注释，是落在|1111xxxx|这个类型里，注意这个其实是用 0001 到 1101 也就是 1到 13 来表示 0到 12，所以 f3 应该就是 2，第一个元素是 2，第二个元素呢，02 代表前一个元素也就是刚才说的这个，占用 2 字节，f6 展开也是刚才的类型，实际是 5，ff 表示 ziplist 的结尾，所以这个 ziplist 里面是两个元素，2 跟 5</p>
+          <p>前面说了这么些数据结构，其实大家对于 redis 最初的印象应该就是个 key-value 的缓存，类似于 memcache，redis 其实也是个 key-value，key 还是一样的字符串，或者说就是用 redis 自己的动态字符串实现，但是 value 其实就是前面说的那些数据结构，差不多快说完了，还有个 quicklist 后面还有一篇，这里先介绍下 redis 对于这些不同类型的 value 是怎么实现的，首先看下 redisObject 的源码头文件</p>
+<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* The actual Redis Object */</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_STRING 0    <span class="comment">/* String object. */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_LIST 1      <span class="comment">/* List object. */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_SET 2       <span class="comment">/* Set object. */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ZSET 3      <span class="comment">/* Sorted set object. */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_HASH 4      <span class="comment">/* Hash object. */</span></span></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment"> * Objects encoding. Some kind of objects like Strings and Hashes can be</span></span><br><span class="line"><span class="comment"> * internally represented in multiple ways. The 'encoding' field of the object</span></span><br><span class="line"><span class="comment"> * is set to one of this fields for this object. */</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_RAW 0     <span class="comment">/* Raw representation */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_INT 1     <span class="comment">/* Encoded as integer */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_HT 2      <span class="comment">/* Encoded as hash table */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_ZIPMAP 3  <span class="comment">/* Encoded as zipmap */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_LINKEDLIST 4 <span class="comment">/* No longer used: old list encoding. */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_ZIPLIST 5 <span class="comment">/* Encoded as ziplist */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_INTSET 6  <span class="comment">/* Encoded as intset */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_SKIPLIST 7  <span class="comment">/* Encoded as skiplist */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_EMBSTR 8  <span class="comment">/* Embedded sds string encoding */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_QUICKLIST 9 <span class="comment">/* Encoded as linked list of ziplists */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_ENCODING_STREAM 10 <span class="comment">/* Encoded as a radix tree of listpacks */</span></span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> LRU_BITS 24</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> LRU_CLOCK_MAX ((1<span class="meta-string">&lt;&lt;LRU_BITS)-1) /* Max value of obj-&gt;lru */</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> LRU_CLOCK_RESOLUTION 1000 <span class="comment">/* LRU clock resolution in ms */</span></span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> OBJ_SHARED_REFCOUNT INT_MAX</span></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">redisObject</span> &#123;</span></span><br><span class="line">    <span class="keyword">unsigned</span> type:<span class="number">4</span>;</span><br><span class="line">    <span class="keyword">unsigned</span> encoding:<span class="number">4</span>;</span><br><span class="line">    <span class="keyword">unsigned</span> lru:LRU_BITS; <span class="comment">/* LRU time (relative to global lru_clock) or</span></span><br><span class="line"><span class="comment">                            * LFU data (least significant 8 bits frequency</span></span><br><span class="line"><span class="comment">                            * and most significant 16 bits access time). */</span></span><br><span class="line">    <span class="keyword">int</span> refcount;</span><br><span class="line">    <span class="keyword">void</span> *ptr;</span><br><span class="line">&#125; robj;</span><br></pre></td></tr></table></figure>
+<p>主体结构就是这个 redisObject，</p>
+<ul>
+<li>type： 字段表示对象的类型，它对应的就是 redis 的对外暴露的，或者说用户可以使用的五种类型，OBJ_STRING, OBJ_LIST, OBJ_SET, OBJ_ZSET, OBJ_HASH</li>
+<li>encoding： 字段表示这个对象在 redis 内部的编码方式，由OBJ_ENCODING_开头的 11 种</li>
+<li>lru: 做LRU替换算法用，占24个bit</li>
+<li>refcount: 引用计数。它允许robj对象在某些情况下被共享。</li>
+<li>ptr: 指向底层实现数据结构的指针<br>当 type 是 OBJ_STRING 时，表示类型是个 string，它的编码方式 encoding 可能有 OBJ_ENCODING_RAW，OBJ_ENCODING_INT，OBJ_ENCODING_EMBSTR 三种<br>当 type 是 OBJ_LIST 时，表示类型是 list，它的编码方式 encoding 是 OBJ_ENCODING_QUICKLIST，对于早一些的版本，2.2这种可能还会使用 OBJ_ENCODING_ZIPLIST，OBJ_ENCODING_LINKEDLIST<br>当 type 是 OBJ_SET 时，是个集合，但是得看具体元素的类型，有可能使用整数集合，OBJ_ENCODING_INTSET, 如果元素不全是整型或者数量超过一定限制，那么编码就是 OBJ_ENCODING_HT hash table 了<br>当 type 是 OBJ_ZSET 时，是个有序集合，它底层有可能使用的是 OBJ_ENCODING_ZIPLIST 或者 OBJ_ENCODING_SKIPLIST<br>当 type 是 OBJ_HASH 时，一开始也是 OBJ_ENCODING_ZIPLIST，然后当数据量大于 hash_max_ziplist_entries 时会转成 OBJ_ENCODING_HT</li>
+</ul>
 
       
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@@ -321,7 +319,7 @@
   
   
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-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/01/10/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%B8%89/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/01/19/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E5%9B%9B/">
 
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@@ -335,7 +333,7 @@
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-            <a href="/2020/01/10/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%B8%89/" class="post-title-link" itemprop="url">redis数据结构介绍三-第三部分 整数集合</a>
+            <a href="/2020/01/19/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E5%9B%9B/" class="post-title-link" itemprop="url">redis数据结构介绍四-第四部分 压缩表</a>
         </h2>
 
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@@ -345,15 +343,8 @@
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               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2020-01-10 00:54:04" itemprop="dateCreated datePublished" datetime="2020-01-10T00:54:04+08:00">2020-01-10</time>
+              <time title="Created: 2020-01-19 00:00:22" itemprop="dateCreated datePublished" datetime="2020-01-19T00:00:22+08:00">2020-01-19</time>
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-                  <i class="far fa-calendar-check"></i>
-                </span>
-                <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
-              </span>
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@@ -381,7 +372,7 @@
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+            <span id="/2020/01/19/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E5%9B%9B/" class="post-meta-item leancloud_visitors" data-flag-title="redis数据结构介绍四-第四部分 压缩表" title="Views">
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@@ -396,8 +387,8 @@
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-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/01/10/redis数据结构介绍三/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/01/19/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E5%9B%9B/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/01/19/redis数据结构介绍四/" itemprop="commentCount"></span>
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@@ -412,14 +403,18 @@
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-          <p>redis中对于 set 其实有两种处理，对于元素均为整型，并且元素数目较少时，使用 intset 作为底层数据结构，否则使用 dict 作为底层数据结构，先看一下代码先</p>
-<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">intset</span> &#123;</span></span><br><span class="line">    <span class="comment">// 编码方式</span></span><br><span class="line">    <span class="keyword">uint32_t</span> encoding;</span><br><span class="line">    <span class="comment">// 集合包含的元素数量</span></span><br><span class="line">    <span class="keyword">uint32_t</span> length;</span><br><span class="line">    <span class="comment">// 保存元素的数组</span></span><br><span class="line">    <span class="keyword">int8_t</span> contents[];</span><br><span class="line">&#125; intset;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* Note that these encodings are ordered, so:</span></span><br><span class="line"><span class="comment"> * INTSET_ENC_INT16 &lt; INTSET_ENC_INT32 &lt; INTSET_ENC_INT64. */</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> INTSET_ENC_INT16 (sizeof(int16_t))</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> INTSET_ENC_INT32 (sizeof(int32_t))</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> INTSET_ENC_INT64 (sizeof(int64_t))</span></span><br></pre></td></tr></table></figure>
-<p>一眼看，为啥整型还需要编码，然后 int8_t 怎么能存下大整形呢，带着这些疑问，我们一步步分析下去，这里的编码其实指的是这个整型集合里存的究竟是多大的整型，16 位，还是 32 位，还是 64 位，结构体下面的宏定义就是表示了 encoding 的可能取值，INTSET_ENC_INT16 表示每个元素用2个字节存储，INTSET_ENC_INT32 表示每个元素用4个字节存储，INTSET_ENC_INT64 表示每个元素用8个字节存储。因此，intset中存储的整数最多只能占用64bit。length 就是正常的表示集合中元素的数量。最奇怪的应该就是这个 contents 了，是个 int8_t 的数组，那放毛线数据啊，最小的都有 16 位，这里我在看代码和《redis 设计与实现》的时候也有点懵逼，后来查了下发现这是个比较取巧的用法，这里我用自己的理解表述一下，先看看 8，16，32，64 的关系，一眼看就知道都是 2 的 N 次，并且呈两倍关系，而且 8 位刚好一个字节，所以呢其实这里的contents 不是个常规意义上的 int8_t 类型的数组，而是个柔性数组。看下 wiki 的定义</p>
+          <p>在 redis 中还有一类表型数据结构叫压缩表，ziplist，它的目的是替代链表，链表是个很容易理解的数据结构，双向链表有前后指针，有带头结点的有的不带，但是链表有个比较大的问题是相对于普通的数组，它的内存不连续，碎片化的存储，内存利用效率不高，而且指针寻址相对于直接使用偏移量的话，也有一定的效率劣势，当然这不是主要的原因，ziplist 设计的主要目的是让链表的内存使用更高效</p>
 <blockquote>
-<p>Flexible array members<a href="https://en.wikipedia.org/wiki/Flexible_array_member#cite_note-1" target="_blank" rel="noopener">1</a> were introduced in the <a href="https://en.wikipedia.org/wiki/C99" target="_blank" rel="noopener">C99</a> standard of the <a href="https://en.wikipedia.org/wiki/C_(programming_language)" target="_blank" rel="noopener">C programming language</a> (in particular, in section §6.7.2.1, item 16, page 103).<a href="https://en.wikipedia.org/wiki/Flexible_array_member#cite_note-2" target="_blank" rel="noopener">2</a> It is a member of a struct, which is an array without a given dimension. It must be the last member of such a struct and it must be accompanied by at least one other member, as in the following example:</p>
+<p>The ziplist is a specially encoded dually linked list that is designed to be very memory efficient.<br>这是摘自 redis 源码中ziplist.c 文件的注释，也说明了原因，它的大概结构是这样子</p>
 </blockquote>
-<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">vectord</span> &#123;</span></span><br><span class="line">    <span class="keyword">size_t</span> len;</span><br><span class="line">    <span class="keyword">double</span> arr[]; <span class="comment">// the flexible array member must be last</span></span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
-<p>在初始化这个 intset 的时候，这个contents数组是不占用空间的，后面的反正用到了申请，那么这里就有一个问题，给出了三种可能的 encoding 值，他们能随便换吗，显然不行，首先在 intset 中数据的存放是有序的，这个有部分原因是方便二分查找，然后存放数据其实随着数据的大小不同会有一个升级的过程，看下图<br><img data-src="https://i.loli.net/2020/01/10/qIc6HgP7wfCLipN.png" alt=""><br>新创建的intset只有一个header，总共8个字节。其中encoding = 2, length = 0, 类型都是uint32_t，各占 4 字节，添加15, 5两个元素之后，因为它们是比较小的整数，都能使用2个字节表示，所以encoding不变，值还是2，也就是默认的 <code>INTSET_ENC_INT16</code>，当添加32768的时候，它不再能用2个字节来表示了（2个字节能表达的数据范围是-215~215-1，而32768等于215，超出范围了），因此encoding必须升级到INTSET_ENC_INT32（值为4），即用4个字节表示一个元素。在添加每个元素的过程中，intset始终保持从小到大有序。与ziplist类似，intset也是按小端（little endian）模式存储的（参见维基百科词条<a href="https://en.wikipedia.org/wiki/Endianness" target="_blank" rel="noopener">Endianness</a>）。比如，在上图中intset添加完所有数据之后，表示encoding字段的4个字节应该解释成0x00000004，而第4个数据应该解释成0x00008000 = 32768</p>
+<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;zlbytes&gt; &lt;zltail&gt; &lt;zllen&gt; &lt;entry&gt; &lt;entry&gt; ... &lt;entry&gt; &lt;zlend&gt;</span><br></pre></td></tr></table></figure>
+<p>其中<br><code>&lt;zlbytes&gt;</code>表示 ziplist 占用的字节总数，类型是uint32_t，32 位的无符号整型，当然表示的字节数也包含自己本身占用的 4 个<br><code>&lt;zltail&gt;</code> 类型也是是uint32_t，表示ziplist表中最后一项（entry）在ziplist中的偏移字节数。<code>&lt;zltail&gt;</code>的存在，使得我们可以很方便地找到最后一项（不用遍历整个ziplist），从而可以在ziplist尾端快速地执行push或pop操作。<br><code>&lt;uint16_t zllen&gt;</code> 表示ziplist 中的数据项个数，因为是 16 位，所以当数量超过所能表示的最大的数量，它的 16 位全会置为 1，但是真实的数量需要遍历整个 ziplist 才能知道<br><code>&lt;entry&gt;</code>是具体的数据项，后面解释<br><code>&lt;zlend&gt;</code> ziplist 的最后一个字节，固定是255。<br>再看一下<code>&lt;entry&gt;</code>中的具体结构，</p>
+<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;prevlen&gt; &lt;encoding&gt; &lt;entry-data&gt;</span><br></pre></td></tr></table></figure>
+<p>首先这个<code>&lt;prevlen&gt;</code>有两种情况，一种是前面的元素的长度，如果是小于等于 253的时候就用一个uint8_t 来表示前一元素的长度，如果大于的话他将占用五个字节，第一个字节是 254，即表示这个字节已经表示不下了，需要后面的四个字节帮忙表示<br><code>&lt;encoding&gt;</code>这个就比较复杂，把源码的注释放下面先看下</p>
+<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line">* |00pppppp| - 1 byte</span><br><span class="line">*      String value with length less than or equal to 63 bytes (6 bits).</span><br><span class="line">*      &quot;pppppp&quot; represents the unsigned 6 bit length.</span><br><span class="line">* |01pppppp|qqqqqqqq| - 2 bytes</span><br><span class="line">*      String value with length less than or equal to 16383 bytes (14 bits).</span><br><span class="line">*      IMPORTANT: The 14 bit number is stored in big endian.</span><br><span class="line">* |10000000|qqqqqqqq|rrrrrrrr|ssssssss|tttttttt| - 5 bytes</span><br><span class="line">*      String value with length greater than or equal to 16384 bytes.</span><br><span class="line">*      Only the 4 bytes following the first byte represents the length</span><br><span class="line">*      up to 32^2-1. The 6 lower bits of the first byte are not used and</span><br><span class="line">*      are set to zero.</span><br><span class="line">*      IMPORTANT: The 32 bit number is stored in big endian.</span><br><span class="line">* |11000000| - 3 bytes</span><br><span class="line">*      Integer encoded as int16_t (2 bytes).</span><br><span class="line">* |11010000| - 5 bytes</span><br><span class="line">*      Integer encoded as int32_t (4 bytes).</span><br><span class="line">* |11100000| - 9 bytes</span><br><span class="line">*      Integer encoded as int64_t (8 bytes).</span><br><span class="line">* |11110000| - 4 bytes</span><br><span class="line">*      Integer encoded as 24 bit signed (3 bytes).</span><br><span class="line">* |11111110| - 2 bytes</span><br><span class="line">*      Integer encoded as 8 bit signed (1 byte).</span><br><span class="line">* |1111xxxx| - (with xxxx between 0000 and 1101) immediate 4 bit integer.</span><br><span class="line">*      Unsigned integer from 0 to 12. The encoded value is actually from</span><br><span class="line">*      1 to 13 because 0000 and 1111 can not be used, so 1 should be</span><br><span class="line">*      subtracted from the encoded 4 bit value to obtain the right value.</span><br><span class="line">* |11111111| - End of ziplist special entry.</span><br></pre></td></tr></table></figure>
+<p>首先如果 encoding 的前两位是 00 的话代表这个元素是个 6 位的字符串，即直接将数据保存在 encoding 中，不消耗额外的<code>&lt;entry-data&gt;</code>，如果前两位是 01 的话表示是个 14 位的字符串，如果是 10 的话表示encoding 块之后的四个字节是存放字符串类型的数据，encoding 的剩余 6 位置 0。<br>如果 encoding 的前两位是 11 的话表示这是个整型，具体的如果后两位是00的话，表示后面是个2字节的 int16_t 类型，如果是01的话，后面是个4字节的int32_t,如果是10的话后面是8字节的int64_t,如果是 11 的话后面是 3 字节的有符号整型，这些都要最后 4 位都是 0 的情况噢<br>剩下当是<code>11111110</code>时，则表示是一个1 字节的有符号数，如果是 <code>1111xxxx</code>，其中<code>xxxx</code>在0000 到 1101 表示实际的 1 到 13，为啥呢，因为 0000 前面已经用过了，而 1110 跟 1111 也都有用了。<br>看个具体的例子(上下有点对不齐，将就看)</p>
+<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">[0f 00 00 00] [0c 00 00 00] [02 00] [00 f3] [02 f6] [ff]</span><br><span class="line">|**zlbytes***|  |***zltail***|  |*zllen*|  |entry1 entry2|  |zlend|</span><br></pre></td></tr></table></figure>
+<p>第一部分代表整个 ziplist 有 15 个字节，zlbytes 自己占了 4 个 zltail 表示最后一个元素的偏移量，第 13 个字节起，zllen 表示有 2 个元素，第一个元素是<code>00f3</code>,00表示前一个元素长度是 0，本来前面就没元素(不过不知道这个能不能优化这一字节)，然后是 f3，换成二进制就是11110011,对照上面的注释，是落在|1111xxxx|这个类型里，注意这个其实是用 0001 到 1101 也就是 1到 13 来表示 0到 12，所以 f3 应该就是 2，第一个元素是 2，第二个元素呢，02 代表前一个元素也就是刚才说的这个，占用 2 字节，f6 展开也是刚才的类型，实际是 5，ff 表示 ziplist 的结尾，所以这个 ziplist 里面是两个元素，2 跟 5</p>
 
       
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+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/01/10/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%B8%89/">
 
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-            <a href="/2020/01/04/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%BA%8C/" class="post-title-link" itemprop="url">redis数据结构介绍二-第二部分 跳表</a>
+            <a href="/2020/01/10/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%B8%89/" class="post-title-link" itemprop="url">redis数据结构介绍三-第三部分 整数集合</a>
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               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2020-01-04 00:03:05" itemprop="dateCreated datePublished" datetime="2020-01-04T00:03:05+08:00">2020-01-04</time>
+              <time title="Created: 2020-01-10 00:54:04" itemprop="dateCreated datePublished" datetime="2020-01-10T00:54:04+08:00">2020-01-10</time>
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+            <span id="/2020/01/10/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%B8%89/" class="post-meta-item leancloud_visitors" data-flag-title="redis数据结构介绍三-第三部分 整数集合" title="Views">
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-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/01/04/redis数据结构介绍二/" itemprop="commentCount"></span>
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-          <h2 id="跳表-skiplist"><a href="#跳表-skiplist" class="headerlink" title="跳表 skiplist"></a>跳表 skiplist</h2><p>跳表是个在我们日常的代码中不太常用到的数据结构，相对来讲就没有像数组，链表，字典，散列，树等结构那么熟悉，所以就从头开始分析下，首先是链表，跳表跟链表都有个表字（太硬扯了我🤦‍♀️），注意这是个有序链表<br><img data-src="https://i.loli.net/2020/01/03/Og9i3pCIfxrMhja.png" alt=""><br>如上图，在这个链表里如果我要找到 23，是不是我需要从3，5，9开始一直往后找直到找到 23，也就是说时间复杂度是 O(N),N 的一次幂复杂度，那么我们来看看第二个<br><img data-src="https://i.loli.net/2020/01/03/81P2baupiedOmNf.png" alt=""><br>这个结构跟原先有点不一样，它给链表中偶数位的节点又加了一个指针把它们链接起来，这样子当我们要寻找 23 的时候就可以从原来的一个个往下找变成跳着找，先找到 5，然后是 10，接着是 19，然后是 28，这时候发现 28 比 23 大了，那我在退回到 19，然后从下一层原来的链表往前找，<br><img data-src="https://i.loli.net/2020/01/03/NBguAphilKjs2MO.png" alt=""><br>这里毛估估是不是前面的节点我就少找了一半,有那么点二分法的意思。<br>前面的其实是跳表的引子，真正的跳表其实不是这样，因为上面的其实有个比较大的问题，就是插入一个元素后需要调整每个元素的指针，在 redis 中的跳表其实是做了个随机层数的优化，因为沿着前面的例子，其实当数据量很大的时候，是不是层数越多，其查询效率越高，但是随着层数变多，要保持这种严格的层数规则其实也会增大处理复杂度，所以 redis 插入每个元素的时候都是使用随机的方式，看一眼代码</p>
-<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* ZSETs use a specialized version of Skiplists */</span></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">zskiplistNode</span> &#123;</span></span><br><span class="line">    sds ele;</span><br><span class="line">    <span class="keyword">double</span> score;</span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">zskiplistNode</span> *<span class="title">backward</span>;</span></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">zskiplistLevel</span> &#123;</span></span><br><span class="line">        <span class="class"><span class="keyword">struct</span> <span class="title">zskiplistNode</span> *<span class="title">forward</span>;</span></span><br><span class="line">        <span class="keyword">unsigned</span> <span class="keyword">long</span> span;</span><br><span class="line">    &#125; level[];</span><br><span class="line">&#125; zskiplistNode;</span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">zskiplist</span> &#123;</span></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">zskiplistNode</span> *<span class="title">header</span>, *<span class="title">tail</span>;</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">long</span> length;</span><br><span class="line">    <span class="keyword">int</span> level;</span><br><span class="line">&#125; zskiplist;</span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">zset</span> &#123;</span></span><br><span class="line">    dict *dict;</span><br><span class="line">    zskiplist *zsl;</span><br><span class="line">&#125; zset;</span><br></pre></td></tr></table></figure>
-<p>忘了说了，redis 是把 skiplist 跳表用在 zset 里，zset 是个有序的集合，可以看到 zskiplist 就是个跳表的结构，里面用 header 保存跳表的表头，tail 保存表尾，还有长度和最大层级，具体的跳表节点元素使用 zskiplistNode 表示，里面包含了 sds 类型的元素值，double 类型的分值，用来排序，一个 backward 后向指针和一个 zskiplistLevel 数组，每个 level 包含了一个前向指针，和一个 span，span 表示的是跳表前向指针的跨度，这里再补充一点，前面说了为了灵活这个跳表的新增修改，redis 使用了随机层高的方式插入新节点，但是如果所有节点都随机到很高的层级或者所有都很低的话，跳表的效率优势就会减小，所以 redis 使用了个小技巧，贴下代码</p>
-<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">define</span> ZSKIPLIST_P 0.25      <span class="comment">/* Skiplist P = 1/4 */</span></span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">zslRandomLevel</span><span class="params">(<span class="keyword">void</span>)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">int</span> level = <span class="number">1</span>;</span><br><span class="line">    <span class="keyword">while</span> ((<span class="built_in">random</span>()&amp;<span class="number">0xFFFF</span>) &lt; (ZSKIPLIST_P * <span class="number">0xFFFF</span>))</span><br><span class="line">        level += <span class="number">1</span>;</span><br><span class="line">    <span class="keyword">return</span> (level&lt;ZSKIPLIST_MAXLEVEL) ? level : ZSKIPLIST_MAXLEVEL;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>当随机值跟0xFFFF进行与操作小于ZSKIPLIST_P * 0xFFFF时才会增大 level 的值，因此保持了一个相对递减的概率<br>可以简单分析下，当 random() 的值小于 0xFFFF 的 1/4,才会 level + 1，就意味着当有 1 - 1/4也就是3/4的概率是直接跳出，所以一层的概率是3/4,也就是 1-P，二层的概率是 P*(1-P),三层的概率是 P² * (1-P) 依次递推。</p>
+          <p>redis中对于 set 其实有两种处理，对于元素均为整型，并且元素数目较少时，使用 intset 作为底层数据结构，否则使用 dict 作为底层数据结构，先看一下代码先</p>
+<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">intset</span> &#123;</span></span><br><span class="line">    <span class="comment">// 编码方式</span></span><br><span class="line">    <span class="keyword">uint32_t</span> encoding;</span><br><span class="line">    <span class="comment">// 集合包含的元素数量</span></span><br><span class="line">    <span class="keyword">uint32_t</span> length;</span><br><span class="line">    <span class="comment">// 保存元素的数组</span></span><br><span class="line">    <span class="keyword">int8_t</span> contents[];</span><br><span class="line">&#125; intset;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* Note that these encodings are ordered, so:</span></span><br><span class="line"><span class="comment"> * INTSET_ENC_INT16 &lt; INTSET_ENC_INT32 &lt; INTSET_ENC_INT64. */</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> INTSET_ENC_INT16 (sizeof(int16_t))</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> INTSET_ENC_INT32 (sizeof(int32_t))</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> INTSET_ENC_INT64 (sizeof(int64_t))</span></span><br></pre></td></tr></table></figure>
+<p>一眼看，为啥整型还需要编码，然后 int8_t 怎么能存下大整形呢，带着这些疑问，我们一步步分析下去，这里的编码其实指的是这个整型集合里存的究竟是多大的整型，16 位，还是 32 位，还是 64 位，结构体下面的宏定义就是表示了 encoding 的可能取值，INTSET_ENC_INT16 表示每个元素用2个字节存储，INTSET_ENC_INT32 表示每个元素用4个字节存储，INTSET_ENC_INT64 表示每个元素用8个字节存储。因此，intset中存储的整数最多只能占用64bit。length 就是正常的表示集合中元素的数量。最奇怪的应该就是这个 contents 了，是个 int8_t 的数组，那放毛线数据啊，最小的都有 16 位，这里我在看代码和《redis 设计与实现》的时候也有点懵逼，后来查了下发现这是个比较取巧的用法，这里我用自己的理解表述一下，先看看 8，16，32，64 的关系，一眼看就知道都是 2 的 N 次，并且呈两倍关系，而且 8 位刚好一个字节，所以呢其实这里的contents 不是个常规意义上的 int8_t 类型的数组，而是个柔性数组。看下 wiki 的定义</p>
+<blockquote>
+<p>Flexible array members<a href="https://en.wikipedia.org/wiki/Flexible_array_member#cite_note-1" target="_blank" rel="noopener">1</a> were introduced in the <a href="https://en.wikipedia.org/wiki/C99" target="_blank" rel="noopener">C99</a> standard of the <a href="https://en.wikipedia.org/wiki/C_(programming_language)" target="_blank" rel="noopener">C programming language</a> (in particular, in section §6.7.2.1, item 16, page 103).<a href="https://en.wikipedia.org/wiki/Flexible_array_member#cite_note-2" target="_blank" rel="noopener">2</a> It is a member of a struct, which is an array without a given dimension. It must be the last member of such a struct and it must be accompanied by at least one other member, as in the following example:</p>
+</blockquote>
+<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">vectord</span> &#123;</span></span><br><span class="line">    <span class="keyword">size_t</span> len;</span><br><span class="line">    <span class="keyword">double</span> arr[]; <span class="comment">// the flexible array member must be last</span></span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
+<p>在初始化这个 intset 的时候，这个contents数组是不占用空间的，后面的反正用到了申请，那么这里就有一个问题，给出了三种可能的 encoding 值，他们能随便换吗，显然不行，首先在 intset 中数据的存放是有序的，这个有部分原因是方便二分查找，然后存放数据其实随着数据的大小不同会有一个升级的过程，看下图<br><img data-src="https://i.loli.net/2020/01/10/qIc6HgP7wfCLipN.png" alt=""><br>新创建的intset只有一个header，总共8个字节。其中encoding = 2, length = 0, 类型都是uint32_t，各占 4 字节，添加15, 5两个元素之后，因为它们是比较小的整数，都能使用2个字节表示，所以encoding不变，值还是2，也就是默认的 <code>INTSET_ENC_INT16</code>，当添加32768的时候，它不再能用2个字节来表示了（2个字节能表达的数据范围是-215~215-1，而32768等于215，超出范围了），因此encoding必须升级到INTSET_ENC_INT32（值为4），即用4个字节表示一个元素。在添加每个元素的过程中，intset始终保持从小到大有序。与ziplist类似，intset也是按小端（little endian）模式存储的（参见维基百科词条<a href="https://en.wikipedia.org/wiki/Endianness" target="_blank" rel="noopener">Endianness</a>）。比如，在上图中intset添加完所有数据之后，表示encoding字段的4个字节应该解释成0x00000004，而第4个数据应该解释成0x00008000 = 32768</p>
 
       
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+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/01/04/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%BA%8C/">
 
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-            <a href="/2019/12/26/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D/" class="post-title-link" itemprop="url">redis数据结构介绍-第一部分 SDS，链表，字典</a>
+            <a href="/2020/01/04/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%BA%8C/" class="post-title-link" itemprop="url">redis数据结构介绍二-第二部分 跳表</a>
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               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2019-12-26 00:03:49" itemprop="dateCreated datePublished" datetime="2019-12-26T00:03:49+08:00">2019-12-26</time>
+              <time title="Created: 2020-01-04 00:03:05" itemprop="dateCreated datePublished" datetime="2020-01-04T00:03:05+08:00">2020-01-04</time>
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+            <span id="/2020/01/04/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%BA%8C/" class="post-meta-item leancloud_visitors" data-flag-title="redis数据结构介绍二-第二部分 跳表" title="Views">
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-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/12/26/redis数据结构介绍/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/01/04/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E4%BA%8C/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/01/04/redis数据结构介绍二/" itemprop="commentCount"></span>
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-          <p>redis是现在服务端很常用的缓存中间件，其实原来还有<code>memcache</code>之类的竞品，但是现在貌似 redis 快一统江湖，这里当然不是在吹，只是个人角度的一个感觉，不权威只是主观感觉。<br>redis 主要有五种数据结构，<code>Strings</code>，<code>Lists</code>，<code>Sets</code>，<code>Hashes</code>，<code>Sorted Sets</code>，这五种数据结构先简单介绍下，<code>Strings</code>类型的其实就是我们最常用的 key-value，实际开发中也会用的最多；<code>Lists</code>是列表，这个有些会用来做队列，因为 redis 目前常用的版本支持丰富的列表操作；还有是<code>Sets</code>集合，这个主要的特点就是集合中元素不重复，可以用在有这类需求的场景里；<code>Hashes</code>是叫散列，类似于 Python 中的字典结构；还有就是<code>Sorted Sets</code>这个是个有序集合；一眼看这些其实没啥特别的，除了最后这个有序集合，不过去了解背后的实现方式还是比较有意思的。</p>
-<h2 id="SDS-简单动态字符串"><a href="#SDS-简单动态字符串" class="headerlink" title="SDS 简单动态字符串"></a>SDS 简单动态字符串</h2><p>先从<code>Strings</code>开始说，了解过 C 语言的应该知道，C 语言中的字符串其实是个 <code>char[]</code> 字符数组，redis 也不例外，只是最开始的版本就对这个做了一丢丢的优化，而正是这一丢丢的优化，让这个 redis 的使用效率提升了数倍</p>
-<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">sdshdr</span> &#123;</span></span><br><span class="line">    <span class="comment">// 字符串长度</span></span><br><span class="line">    <span class="keyword">int</span> len;</span><br><span class="line">    <span class="comment">// 字符串空余字符数</span></span><br><span class="line">    <span class="keyword">int</span> <span class="built_in">free</span>;</span><br><span class="line">    <span class="comment">// 字符串内容</span></span><br><span class="line">    <span class="keyword">char</span> buf[];</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
-<p>这里引用了 redis 在 github 上最早的 2.2 版本的代码，代码路径是<code>https://github.com/antirez/redis/blob/2.2/src/sds.h</code>,可以看到这个结构体里只有仨元素，两个 int 型和一个 char 型数组，两个 int 型其实就是我说的优化，因为 C 语言本身的字符串数组，有两个问题，一个是要知道它实际已被占用的长度，需要去遍历这个数组，第二个就是比较容易踩坑的是遍历的时候要注意它有个以<code>\0</code>作为结尾的特点；通过上面的两个 int 型参数，一个是知道字符串目前的长度，一个是知道字符串还剩余多少位空间，这样子坐着两个操作从 <code>O(N)</code>简化到了<code>O(1)</code>了，还有第二个 free 还有个比较重要的作用就是能防止 C 字符串的溢出问题，在存储之前可以先判断 free 长度，如果长度不够就先扩容了，先介绍到这，这个系列可以写蛮多的，慢慢介绍吧</p>
-<h2 id="链表"><a href="#链表" class="headerlink" title="链表"></a>链表</h2><p>链表是比较常见的数据结构了，但是因为 redis 是用 C 写的，所以在不依赖第三方库的情况下只能自己写一个了，redis 的链表是个有头的链表，而且是无环的，具体的结构我也找了 github 上最早版本的代码</p>
-<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">listNode</span> &#123;</span></span><br><span class="line">    <span class="comment">// 前置节点</span></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">listNode</span> *<span class="title">prev</span>;</span></span><br><span class="line">    <span class="comment">// 后置节点</span></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">listNode</span> *<span class="title">next</span>;</span></span><br><span class="line">    <span class="comment">// 值</span></span><br><span class="line">    <span class="keyword">void</span> *value;</span><br><span class="line">&#125; listNode;</span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">list</span> &#123;</span></span><br><span class="line">    <span class="comment">// 链表表头</span></span><br><span class="line">    listNode *head;</span><br><span class="line">    <span class="comment">// 当前节点，也可以说是最后节点</span></span><br><span class="line">    listNode *tail;</span><br><span class="line">    <span class="comment">// 节点复制函数</span></span><br><span class="line">    <span class="keyword">void</span> *(*dup)(<span class="keyword">void</span> *ptr);</span><br><span class="line">    <span class="comment">// 节点值释放函数</span></span><br><span class="line">    <span class="keyword">void</span> (*<span class="built_in">free</span>)(<span class="keyword">void</span> *ptr);</span><br><span class="line">    <span class="comment">// 节点值比较函数</span></span><br><span class="line">    <span class="keyword">int</span> (*match)(<span class="keyword">void</span> *ptr, <span class="keyword">void</span> *key);</span><br><span class="line">    <span class="comment">// 链表包含的节点数量</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">int</span> len;</span><br><span class="line">&#125; <span class="built_in">list</span>;</span><br></pre></td></tr></table></figure>
-<p>代码地址是这个<code>https://github.com/antirez/redis/blob/2.2/src/adlist.h</code><br>可以看下节点是由listNode承载的，包括值和一个指向前节点跟一个指向后一节点的两个指针，然后值是 void 指针类型，所以可以承载不同类型的值<br>然后是 list结构用来承载一个链表，包含了表头，和表尾，复制函数，释放函数和比较函数，还有链表长度，因为包含了前两个节点，找到表尾节点跟表头都是 <code>O(1)</code>的时间复杂度，还有节点数量，其实这个跟 SDS 是同一个做法，就是空间换时间，这也是写代码里比较常见的做法，以此让一些高频的操作提速。</p>
-<h2 id="字典"><a href="#字典" class="headerlink" title="字典"></a>字典</h2><p>字典也是个常用的数据结构，其实只是叫法不同，数据结构中叫 hash 散列，Java 中叫 Map，PHP 中是数组 array，Python 中也叫字典 dict，因为纯 C 语言本身不带这些数据结构，所以这也是个痛并快乐着的过程，享受 C 语言的高性能的同时也要接受它只提供了语言的基本功能的现实，各种轮子都需要自己造，redis 同样实现了自己的字典<br>下面来看看代码</p>
-<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">dictEntry</span> &#123;</span></span><br><span class="line">    <span class="keyword">void</span> *key;</span><br><span class="line">    <span class="keyword">void</span> *val;</span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">dictEntry</span> *<span class="title">next</span>;</span></span><br><span class="line">&#125; dictEntry;</span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">dictType</span> &#123;</span></span><br><span class="line">    <span class="function"><span class="keyword">unsigned</span> <span class="title">int</span> <span class="params">(*hashFunction)</span><span class="params">(<span class="keyword">const</span> <span class="keyword">void</span> *key)</span></span>;</span><br><span class="line">    <span class="keyword">void</span> *(*keyDup)(<span class="keyword">void</span> *privdata, <span class="keyword">const</span> <span class="keyword">void</span> *key);</span><br><span class="line">    <span class="keyword">void</span> *(*valDup)(<span class="keyword">void</span> *privdata, <span class="keyword">const</span> <span class="keyword">void</span> *obj);</span><br><span class="line">    <span class="keyword">int</span> (*keyCompare)(<span class="keyword">void</span> *privdata, <span class="keyword">const</span> <span class="keyword">void</span> *key1, <span class="keyword">const</span> <span class="keyword">void</span> *key2);</span><br><span class="line">    <span class="keyword">void</span> (*keyDestructor)(<span class="keyword">void</span> *privdata, <span class="keyword">void</span> *key);</span><br><span class="line">    <span class="keyword">void</span> (*valDestructor)(<span class="keyword">void</span> *privdata, <span class="keyword">void</span> *obj);</span><br><span class="line">&#125; dictType;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* This is our hash table structure. Every dictionary has two of this as we</span></span><br><span class="line"><span class="comment"> * implement incremental rehashing, for the old to the new table. */</span></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">dictht</span> &#123;</span></span><br><span class="line">    dictEntry **table;</span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">long</span> <span class="built_in">size</span>;</span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">long</span> sizemask;</span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">long</span> used;</span><br><span class="line">&#125; dictht;</span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">dict</span> &#123;</span></span><br><span class="line">    dictType *type;</span><br><span class="line">    <span class="keyword">void</span> *privdata;</span><br><span class="line">    dictht ht[<span class="number">2</span>];</span><br><span class="line">    <span class="keyword">int</span> rehashidx; <span class="comment">/* rehashing not in progress if rehashidx == -1 */</span></span><br><span class="line">    <span class="keyword">int</span> iterators; <span class="comment">/* number of iterators currently running */</span></span><br><span class="line">&#125; dict;</span><br></pre></td></tr></table></figure>
-<p>看了下这个 2.2 版本的代码跟最新版的其实也差的不是很多，所以还是照旧用老代码，可以看到上面四个结构体中，其实只有三个是存储数据用的，dictType 是用来放操作函数的，那么三个存放数据的结构体分别是干嘛的，这时候感觉需要一个图来说明比较好，稍等，我去画个图~<br><img data-src="https://i.loli.net/2019/12/29/UL4AR1HSEKOh9Qm.png" alt=""><br>这个图看着应该比较清楚这些都是用来干嘛的了，dict 是我们的主体结构，它有一个指向 dictType 的指针，这里面包含了字典的操作函数，然后是一个私有数据指针，接下来是一个 dictht 的数组，包含两个dictht，这个就是用来存数据的了，然后是 rehashidx 表示重哈希的状态，当是-1 的时候表示当前没有重哈希，iterators 表示正在遍历的迭代器的数量。<br>首先说说为啥需要有两个 dictht，这是因为字典 dict 这个数据结构随着数据量的增减，会需要在中途做扩容或者缩容操作，如果只有一个的话，对它进行扩容缩容时会影响正常的访问和修改操作，或者说保证正常查询，修改的正确性会比较复杂，并且因为需要高效利用空间，不能一下子申请一个非常大的空间来存很少的数据。当 dict 中 dictht 中的数据量超过 size 的时候负载就超过了 1，就需要进行扩容，这里的其实跟 Java 中的 HashMap 比较类似，超过一定的负载之后进行扩容。这里为啥 size 会超过 1 呢，可能有部分不了解这类结构的同学会比较奇怪，其实就是上图中画的，在数据结构中对于散列的冲突有几类解决方法，比如转换成链表，二次散列，找下个空槽等，这里就使用了链表法，或者说拉链法。当一个新元素通过 hashFunction 得出的 key 跟 sizemask 取模之后的值相同了，那就将其放在原来的节点之前，变成链表挂在数组 dictht.table下面，放在原有节点前是考虑到可能会优先访问。<br>忘了说明下 dictht 跟 dictEntry 的关系了，dictht 就是个哈希表，它里面是个dictEntry 的二维数组，而 dictEntry 是个包含了 key-value 结构之外还有一个 next 指针，因此可以将哈希冲突的以链表的形式保存下来。<br>在重点说下重哈希，可能同样写 Java 的同学对这个比较有感觉，跟 HashMap 一样，会以 2 的 N 次方进行扩容，那么扩容的方法就会比较简单，每个键重哈希要不就在原来这个槽，要不就在原来的槽加原 dictht.size 的位置；然后是重头戏，具体是怎么做扩容呢，其实这里就把第二个 ht 用上了，其实这两个hashtable 的具体作用有点类似于 jvm 中的两个 survival 区，但是又不全一样，因为 redis 在扩容的时候是采用的渐进式地重哈希，什么叫渐进式的呢，就是它不是像 jvm 那种标记复制的模式直接将一个 eden 区和原来的 survival 区存活的对象复制到另一个 survival 区，而是在每一次添加，删除，查找或者更新操作时，都会额外的帮忙搬运一部分的原 dictht 中的数据，这里会根据 rehashidx 的值来判断，如果是-1 表示并没有在重哈希中，如果是 0 表示开始重哈希了，然后rehashidx 还会随着每次的帮忙搬运往上加，但全部被搬运完成后 rehashidx 又变回了-1，又可以扯到Java 中的 Concurrent HashMap, 他在扩容的时候也使用了类似的操作。</p>
+          <h2 id="跳表-skiplist"><a href="#跳表-skiplist" class="headerlink" title="跳表 skiplist"></a>跳表 skiplist</h2><p>跳表是个在我们日常的代码中不太常用到的数据结构，相对来讲就没有像数组，链表，字典，散列，树等结构那么熟悉，所以就从头开始分析下，首先是链表，跳表跟链表都有个表字（太硬扯了我🤦‍♀️），注意这是个有序链表<br><img data-src="https://i.loli.net/2020/01/03/Og9i3pCIfxrMhja.png" alt=""><br>如上图，在这个链表里如果我要找到 23，是不是我需要从3，5，9开始一直往后找直到找到 23，也就是说时间复杂度是 O(N),N 的一次幂复杂度，那么我们来看看第二个<br><img data-src="https://i.loli.net/2020/01/03/81P2baupiedOmNf.png" alt=""><br>这个结构跟原先有点不一样，它给链表中偶数位的节点又加了一个指针把它们链接起来，这样子当我们要寻找 23 的时候就可以从原来的一个个往下找变成跳着找，先找到 5，然后是 10，接着是 19，然后是 28，这时候发现 28 比 23 大了，那我在退回到 19，然后从下一层原来的链表往前找，<br><img data-src="https://i.loli.net/2020/01/03/NBguAphilKjs2MO.png" alt=""><br>这里毛估估是不是前面的节点我就少找了一半,有那么点二分法的意思。<br>前面的其实是跳表的引子，真正的跳表其实不是这样，因为上面的其实有个比较大的问题，就是插入一个元素后需要调整每个元素的指针，在 redis 中的跳表其实是做了个随机层数的优化，因为沿着前面的例子，其实当数据量很大的时候，是不是层数越多，其查询效率越高，但是随着层数变多，要保持这种严格的层数规则其实也会增大处理复杂度，所以 redis 插入每个元素的时候都是使用随机的方式，看一眼代码</p>
+<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* ZSETs use a specialized version of Skiplists */</span></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">zskiplistNode</span> &#123;</span></span><br><span class="line">    sds ele;</span><br><span class="line">    <span class="keyword">double</span> score;</span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">zskiplistNode</span> *<span class="title">backward</span>;</span></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">zskiplistLevel</span> &#123;</span></span><br><span class="line">        <span class="class"><span class="keyword">struct</span> <span class="title">zskiplistNode</span> *<span class="title">forward</span>;</span></span><br><span class="line">        <span class="keyword">unsigned</span> <span class="keyword">long</span> span;</span><br><span class="line">    &#125; level[];</span><br><span class="line">&#125; zskiplistNode;</span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">zskiplist</span> &#123;</span></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">zskiplistNode</span> *<span class="title">header</span>, *<span class="title">tail</span>;</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">long</span> length;</span><br><span class="line">    <span class="keyword">int</span> level;</span><br><span class="line">&#125; zskiplist;</span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">zset</span> &#123;</span></span><br><span class="line">    dict *dict;</span><br><span class="line">    zskiplist *zsl;</span><br><span class="line">&#125; zset;</span><br></pre></td></tr></table></figure>
+<p>忘了说了，redis 是把 skiplist 跳表用在 zset 里，zset 是个有序的集合，可以看到 zskiplist 就是个跳表的结构，里面用 header 保存跳表的表头，tail 保存表尾，还有长度和最大层级，具体的跳表节点元素使用 zskiplistNode 表示，里面包含了 sds 类型的元素值，double 类型的分值，用来排序，一个 backward 后向指针和一个 zskiplistLevel 数组，每个 level 包含了一个前向指针，和一个 span，span 表示的是跳表前向指针的跨度，这里再补充一点，前面说了为了灵活这个跳表的新增修改，redis 使用了随机层高的方式插入新节点，但是如果所有节点都随机到很高的层级或者所有都很低的话，跳表的效率优势就会减小，所以 redis 使用了个小技巧，贴下代码</p>
+<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">define</span> ZSKIPLIST_P 0.25      <span class="comment">/* Skiplist P = 1/4 */</span></span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">zslRandomLevel</span><span class="params">(<span class="keyword">void</span>)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">int</span> level = <span class="number">1</span>;</span><br><span class="line">    <span class="keyword">while</span> ((<span class="built_in">random</span>()&amp;<span class="number">0xFFFF</span>) &lt; (ZSKIPLIST_P * <span class="number">0xFFFF</span>))</span><br><span class="line">        level += <span class="number">1</span>;</span><br><span class="line">    <span class="keyword">return</span> (level&lt;ZSKIPLIST_MAXLEVEL) ? level : ZSKIPLIST_MAXLEVEL;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>当随机值跟0xFFFF进行与操作小于ZSKIPLIST_P * 0xFFFF时才会增大 level 的值，因此保持了一个相对递减的概率<br>可以简单分析下，当 random() 的值小于 0xFFFF 的 1/4,才会 level + 1，就意味着当有 1 - 1/4也就是3/4的概率是直接跳出，所以一层的概率是3/4,也就是 1-P，二层的概率是 P*(1-P),三层的概率是 P² * (1-P) 依次递推。</p>
 
       
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+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/12/26/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D/">
 
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-            <a href="/2019/12/21/%E8%81%8A%E8%81%8AJava%E4%B8%AD%E7%9A%84%E5%8D%95%E4%BE%8B%E6%A8%A1%E5%BC%8F/" class="post-title-link" itemprop="url">聊聊Java中的单例模式</a>
+            <a href="/2019/12/26/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D/" class="post-title-link" itemprop="url">redis数据结构介绍-第一部分 SDS，链表，字典</a>
         </h2>
 
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@@ -704,14 +697,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2019-12-21 01:03:09" itemprop="dateCreated datePublished" datetime="2019-12-21T01:03:09+08:00">2019-12-21</time>
+              <time title="Created: 2019-12-26 00:03:49" itemprop="dateCreated datePublished" datetime="2019-12-26T00:03:49+08:00">2019-12-26</time>
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-                <time title="Modified: 2019-12-22 08:46:11" itemprop="dateModified" datetime="2019-12-22T08:46:11+08:00">2019-12-22</time>
+                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
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               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
+                  <a href="/categories/Redis/" itemprop="url" rel="index"><span itemprop="name">Redis</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Redis/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/" itemprop="url" rel="index"><span itemprop="name">数据结构</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/Design-Patterns/" itemprop="url" rel="index"><span itemprop="name">Design Patterns</span></a>
+                  <a href="/categories/C/" itemprop="url" rel="index"><span itemprop="name">C</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/Singleton/" itemprop="url" rel="index"><span itemprop="name">Singleton</span></a>
+                  <a href="/categories/Redis/%E6%BA%90%E7%A0%81/" itemprop="url" rel="index"><span itemprop="name">源码</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/C/Redis/" itemprop="url" rel="index"><span itemprop="name">Redis</span></a>
                 </span>
             </span>
 
           
-            <span id="/2019/12/21/%E8%81%8A%E8%81%8AJava%E4%B8%AD%E7%9A%84%E5%8D%95%E4%BE%8B%E6%A8%A1%E5%BC%8F/" class="post-meta-item leancloud_visitors" data-flag-title="聊聊Java中的单例模式" title="Views">
+            <span id="/2019/12/26/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D/" class="post-meta-item leancloud_visitors" data-flag-title="redis数据结构介绍-第一部分 SDS，链表，字典" title="Views">
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-    <a title="disqus" href="/2019/12/21/%E8%81%8A%E8%81%8AJava%E4%B8%AD%E7%9A%84%E5%8D%95%E4%BE%8B%E6%A8%A1%E5%BC%8F/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/12/21/聊聊Java中的单例模式/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2019/12/26/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/12/26/redis数据结构介绍/" itemprop="commentCount"></span>
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-          <p>这是个 Java 面试的高频问题，我也遇到过，以往都是觉得这类题没意思，网上一搜一大堆，也不愿意记，其实说回来，主要还是没静下心来好好去理解，今天无意中看到一个课程，基本帮我把一些疑惑的点讲清楚了，首先单例是啥意思，这个其实是有范围一说，比如我起了个<code>Spring Boot</code>应用，在这个应用范围内，我的常规 bean 是单例的，意味着 getBean 的时候其实永远只会拿到那一个对象，那要怎么来写一个单例呢，首先就是传说中的饿汉模式，也是最简单的</p>
-<h2 id="饿汉模式"><a href="#饿汉模式" class="headerlink" title="饿汉模式"></a>饿汉模式</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Singleton1</span> </span>&#123;</span><br><span class="line">    <span class="comment">// 首先，将构造方法变成私有的</span></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="title">Singleton1</span><span class="params">()</span> </span>&#123;&#125;;</span><br><span class="line">    <span class="comment">// 创建私有静态实例，这样第一次使用的时候就会进行创建</span></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> Singleton instance = <span class="keyword">new</span> Singleton1();</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 使用这个对象都是通过这个 getInstance 来获取</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Singleton1 <span class="title">getInstance</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> instance;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">// 瞎写一个静态方法。这里想说的是，如果我们只是要调用 Singleton.getDate(...)，</span></span><br><span class="line">    <span class="comment">// 本来是不想要生成 Singleton 实例的，不过没办法，已经生成了</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Date <span class="title">getDate</span><span class="params">(String mode)</span> </span>&#123;<span class="keyword">return</span> <span class="keyword">new</span> Date();&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>上面借鉴了一些代码，其实这是最基本，也不会错的方法，但是正如其中<code>getDate</code>方法里说的问题，有时候并没有想那这个对象，但是因为我调用了这个类的静态方法，导致对象已经生成了，可能这也是饿汉模式名字的来由，不管三七二十一给你生成个单例就完事了，不管有没有用，但是这种个人觉得也没啥大问题，如果是面试的话最好说出来它的缺点</p>
-<h2 id="饱汉模式"><a href="#饱汉模式" class="headerlink" title="饱汉模式"></a>饱汉模式</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Singleton2</span> </span>&#123;</span><br><span class="line">    <span class="comment">// 首先，也是先堵死 new Singleton() 这条路,将构造方法变成私有</span></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="title">Singleton2</span><span class="params">()</span> </span>&#123;&#125;</span><br><span class="line">    <span class="comment">// 和饿汉模式相比，这边不需要先实例化出来，注意这里的 volatile，它是必须的</span></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">volatile</span> Singleton2 instance = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> m = <span class="number">9</span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Singleton <span class="title">getInstance</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (instance == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="comment">// 加锁</span></span><br><span class="line">            <span class="keyword">synchronized</span> (Singleton2<span class="class">.<span class="keyword">class</span>) </span>&#123;</span><br><span class="line">                <span class="comment">// 这一次判断也是必须的，不然会有并发问题</span></span><br><span class="line">                <span class="keyword">if</span> (instance == <span class="keyword">null</span>) &#123;</span><br><span class="line">                    instance = <span class="keyword">new</span> Singleton2();</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> instance;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>这里容易错的有三点，理解了其实就比较好记了</p>
-<p>第一点，为啥不在 getInstance 上整个代码块加 <code>synchronized</code>，这个其实比较容易理解，就是锁的力度太大，性能太差了，这点其实也要去理解，可以举个夸张的例子，比如我一个电商的服务，如果为了避免一个人的订单出现问题，是不是可以从请求入口就把他锁住，到请求结束释放，那么里面做的事情都有保障，然而这显然不可能，因为我们想要这种竞态条件抢占资源的时间尽量减少，防止其他线程等待。<br>第二点，为啥<code>synchronized</code>之已经检查了 <code>instance == null</code>,还要在里面再检查一次，这个有个术语，叫 <code>double check lock</code>,但是为啥要这么做呢，其实很简单，想象当有两个线程，都过了第一步为空判断，这个时候只有一个线程能拿到这个锁，另一个线程就等待了，如果不再判断一次，那么第一个线程新建完对象释放锁之后，第二个线程又能拿到锁，再去创建一个对象。<br>第三点，为啥要<code>volatile</code>关键字，原先对它的理解是它修饰的变量在 JMM 中能及时将变量值写到主存中，但是它还有个很重要的作用，就是防止指令重排序，<code>instance = new Singleton();</code>这行代码其实在底层是分成三条指令执行的，第一条是在堆上申请了一块内存放这个对象，但是对象的字段啥的都还是默认值，第二条是设置对象的值，比如上面的 m 是 9，然后第三条是将这个对象和虚拟机栈上的指针建立引用关联，那么如果我不用<code>volatile</code>关键字，这三条指令就有可能出现重排，比如变成了 1-3-2 这种顺序，当执行完第二步时，有个线程来访问这个对象了，先判断是不是空，发现不是空的，就拿去直接用了，是不是就出现问题了，所以这个<code>volatile</code>也是不可缺少的</p>
-<h2 id="嵌套类"><a href="#嵌套类" class="headerlink" title="嵌套类"></a>嵌套类</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Singleton3</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="title">Singleton3</span><span class="params">()</span> </span>&#123;&#125;</span><br><span class="line">    <span class="comment">// 主要是使用了 嵌套类可以访问外部类的静态属性和静态方法 的特性</span></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">Holder</span> </span>&#123;</span><br><span class="line">        <span class="keyword">private</span> <span class="keyword">static</span> Singleton3 instance = <span class="keyword">new</span> Singleton3();</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Singleton3 <span class="title">getInstance</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> Holder.instance;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>这个我个人感觉是饿汉模式的升级版，可以在调用<code>getInstance</code>的时候去实例化对象，也是比较推荐的</p>
-<h2 id="枚举单例"><a href="#枚举单例" class="headerlink" title="枚举单例"></a>枚举单例</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">enum</span> Singleton &#123;</span><br><span class="line">    INSTANCE;</span><br><span class="line">    </span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doSomething</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="comment">//todo doSomething</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>枚举很特殊，它在类加载的时候会初始化里面的所有的实例，而且 JVM 保证了它们不会再被实例化，所以它天生就是单例的。</p>
+          <p>redis是现在服务端很常用的缓存中间件，其实原来还有<code>memcache</code>之类的竞品，但是现在貌似 redis 快一统江湖，这里当然不是在吹，只是个人角度的一个感觉，不权威只是主观感觉。<br>redis 主要有五种数据结构，<code>Strings</code>，<code>Lists</code>，<code>Sets</code>，<code>Hashes</code>，<code>Sorted Sets</code>，这五种数据结构先简单介绍下，<code>Strings</code>类型的其实就是我们最常用的 key-value，实际开发中也会用的最多；<code>Lists</code>是列表，这个有些会用来做队列，因为 redis 目前常用的版本支持丰富的列表操作；还有是<code>Sets</code>集合，这个主要的特点就是集合中元素不重复，可以用在有这类需求的场景里；<code>Hashes</code>是叫散列，类似于 Python 中的字典结构；还有就是<code>Sorted Sets</code>这个是个有序集合；一眼看这些其实没啥特别的，除了最后这个有序集合，不过去了解背后的实现方式还是比较有意思的。</p>
+<h2 id="SDS-简单动态字符串"><a href="#SDS-简单动态字符串" class="headerlink" title="SDS 简单动态字符串"></a>SDS 简单动态字符串</h2><p>先从<code>Strings</code>开始说，了解过 C 语言的应该知道，C 语言中的字符串其实是个 <code>char[]</code> 字符数组，redis 也不例外，只是最开始的版本就对这个做了一丢丢的优化，而正是这一丢丢的优化，让这个 redis 的使用效率提升了数倍</p>
+<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">sdshdr</span> &#123;</span></span><br><span class="line">    <span class="comment">// 字符串长度</span></span><br><span class="line">    <span class="keyword">int</span> len;</span><br><span class="line">    <span class="comment">// 字符串空余字符数</span></span><br><span class="line">    <span class="keyword">int</span> <span class="built_in">free</span>;</span><br><span class="line">    <span class="comment">// 字符串内容</span></span><br><span class="line">    <span class="keyword">char</span> buf[];</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
+<p>这里引用了 redis 在 github 上最早的 2.2 版本的代码，代码路径是<code>https://github.com/antirez/redis/blob/2.2/src/sds.h</code>,可以看到这个结构体里只有仨元素，两个 int 型和一个 char 型数组，两个 int 型其实就是我说的优化，因为 C 语言本身的字符串数组，有两个问题，一个是要知道它实际已被占用的长度，需要去遍历这个数组，第二个就是比较容易踩坑的是遍历的时候要注意它有个以<code>\0</code>作为结尾的特点；通过上面的两个 int 型参数，一个是知道字符串目前的长度，一个是知道字符串还剩余多少位空间，这样子坐着两个操作从 <code>O(N)</code>简化到了<code>O(1)</code>了，还有第二个 free 还有个比较重要的作用就是能防止 C 字符串的溢出问题，在存储之前可以先判断 free 长度，如果长度不够就先扩容了，先介绍到这，这个系列可以写蛮多的，慢慢介绍吧</p>
+<h2 id="链表"><a href="#链表" class="headerlink" title="链表"></a>链表</h2><p>链表是比较常见的数据结构了，但是因为 redis 是用 C 写的，所以在不依赖第三方库的情况下只能自己写一个了，redis 的链表是个有头的链表，而且是无环的，具体的结构我也找了 github 上最早版本的代码</p>
+<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">listNode</span> &#123;</span></span><br><span class="line">    <span class="comment">// 前置节点</span></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">listNode</span> *<span class="title">prev</span>;</span></span><br><span class="line">    <span class="comment">// 后置节点</span></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">listNode</span> *<span class="title">next</span>;</span></span><br><span class="line">    <span class="comment">// 值</span></span><br><span class="line">    <span class="keyword">void</span> *value;</span><br><span class="line">&#125; listNode;</span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">list</span> &#123;</span></span><br><span class="line">    <span class="comment">// 链表表头</span></span><br><span class="line">    listNode *head;</span><br><span class="line">    <span class="comment">// 当前节点，也可以说是最后节点</span></span><br><span class="line">    listNode *tail;</span><br><span class="line">    <span class="comment">// 节点复制函数</span></span><br><span class="line">    <span class="keyword">void</span> *(*dup)(<span class="keyword">void</span> *ptr);</span><br><span class="line">    <span class="comment">// 节点值释放函数</span></span><br><span class="line">    <span class="keyword">void</span> (*<span class="built_in">free</span>)(<span class="keyword">void</span> *ptr);</span><br><span class="line">    <span class="comment">// 节点值比较函数</span></span><br><span class="line">    <span class="keyword">int</span> (*match)(<span class="keyword">void</span> *ptr, <span class="keyword">void</span> *key);</span><br><span class="line">    <span class="comment">// 链表包含的节点数量</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">int</span> len;</span><br><span class="line">&#125; <span class="built_in">list</span>;</span><br></pre></td></tr></table></figure>
+<p>代码地址是这个<code>https://github.com/antirez/redis/blob/2.2/src/adlist.h</code><br>可以看下节点是由listNode承载的，包括值和一个指向前节点跟一个指向后一节点的两个指针，然后值是 void 指针类型，所以可以承载不同类型的值<br>然后是 list结构用来承载一个链表，包含了表头，和表尾，复制函数，释放函数和比较函数，还有链表长度，因为包含了前两个节点，找到表尾节点跟表头都是 <code>O(1)</code>的时间复杂度，还有节点数量，其实这个跟 SDS 是同一个做法，就是空间换时间，这也是写代码里比较常见的做法，以此让一些高频的操作提速。</p>
+<h2 id="字典"><a href="#字典" class="headerlink" title="字典"></a>字典</h2><p>字典也是个常用的数据结构，其实只是叫法不同，数据结构中叫 hash 散列，Java 中叫 Map，PHP 中是数组 array，Python 中也叫字典 dict，因为纯 C 语言本身不带这些数据结构，所以这也是个痛并快乐着的过程，享受 C 语言的高性能的同时也要接受它只提供了语言的基本功能的现实，各种轮子都需要自己造，redis 同样实现了自己的字典<br>下面来看看代码</p>
+<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">dictEntry</span> &#123;</span></span><br><span class="line">    <span class="keyword">void</span> *key;</span><br><span class="line">    <span class="keyword">void</span> *val;</span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">dictEntry</span> *<span class="title">next</span>;</span></span><br><span class="line">&#125; dictEntry;</span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">dictType</span> &#123;</span></span><br><span class="line">    <span class="function"><span class="keyword">unsigned</span> <span class="title">int</span> <span class="params">(*hashFunction)</span><span class="params">(<span class="keyword">const</span> <span class="keyword">void</span> *key)</span></span>;</span><br><span class="line">    <span class="keyword">void</span> *(*keyDup)(<span class="keyword">void</span> *privdata, <span class="keyword">const</span> <span class="keyword">void</span> *key);</span><br><span class="line">    <span class="keyword">void</span> *(*valDup)(<span class="keyword">void</span> *privdata, <span class="keyword">const</span> <span class="keyword">void</span> *obj);</span><br><span class="line">    <span class="keyword">int</span> (*keyCompare)(<span class="keyword">void</span> *privdata, <span class="keyword">const</span> <span class="keyword">void</span> *key1, <span class="keyword">const</span> <span class="keyword">void</span> *key2);</span><br><span class="line">    <span class="keyword">void</span> (*keyDestructor)(<span class="keyword">void</span> *privdata, <span class="keyword">void</span> *key);</span><br><span class="line">    <span class="keyword">void</span> (*valDestructor)(<span class="keyword">void</span> *privdata, <span class="keyword">void</span> *obj);</span><br><span class="line">&#125; dictType;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* This is our hash table structure. Every dictionary has two of this as we</span></span><br><span class="line"><span class="comment"> * implement incremental rehashing, for the old to the new table. */</span></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">dictht</span> &#123;</span></span><br><span class="line">    dictEntry **table;</span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">long</span> <span class="built_in">size</span>;</span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">long</span> sizemask;</span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">long</span> used;</span><br><span class="line">&#125; dictht;</span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">dict</span> &#123;</span></span><br><span class="line">    dictType *type;</span><br><span class="line">    <span class="keyword">void</span> *privdata;</span><br><span class="line">    dictht ht[<span class="number">2</span>];</span><br><span class="line">    <span class="keyword">int</span> rehashidx; <span class="comment">/* rehashing not in progress if rehashidx == -1 */</span></span><br><span class="line">    <span class="keyword">int</span> iterators; <span class="comment">/* number of iterators currently running */</span></span><br><span class="line">&#125; dict;</span><br></pre></td></tr></table></figure>
+<p>看了下这个 2.2 版本的代码跟最新版的其实也差的不是很多，所以还是照旧用老代码，可以看到上面四个结构体中，其实只有三个是存储数据用的，dictType 是用来放操作函数的，那么三个存放数据的结构体分别是干嘛的，这时候感觉需要一个图来说明比较好，稍等，我去画个图~<br><img data-src="https://i.loli.net/2019/12/29/UL4AR1HSEKOh9Qm.png" alt=""><br>这个图看着应该比较清楚这些都是用来干嘛的了，dict 是我们的主体结构，它有一个指向 dictType 的指针，这里面包含了字典的操作函数，然后是一个私有数据指针，接下来是一个 dictht 的数组，包含两个dictht，这个就是用来存数据的了，然后是 rehashidx 表示重哈希的状态，当是-1 的时候表示当前没有重哈希，iterators 表示正在遍历的迭代器的数量。<br>首先说说为啥需要有两个 dictht，这是因为字典 dict 这个数据结构随着数据量的增减，会需要在中途做扩容或者缩容操作，如果只有一个的话，对它进行扩容缩容时会影响正常的访问和修改操作，或者说保证正常查询，修改的正确性会比较复杂，并且因为需要高效利用空间，不能一下子申请一个非常大的空间来存很少的数据。当 dict 中 dictht 中的数据量超过 size 的时候负载就超过了 1，就需要进行扩容，这里的其实跟 Java 中的 HashMap 比较类似，超过一定的负载之后进行扩容。这里为啥 size 会超过 1 呢，可能有部分不了解这类结构的同学会比较奇怪，其实就是上图中画的，在数据结构中对于散列的冲突有几类解决方法，比如转换成链表，二次散列，找下个空槽等，这里就使用了链表法，或者说拉链法。当一个新元素通过 hashFunction 得出的 key 跟 sizemask 取模之后的值相同了，那就将其放在原来的节点之前，变成链表挂在数组 dictht.table下面，放在原有节点前是考虑到可能会优先访问。<br>忘了说明下 dictht 跟 dictEntry 的关系了，dictht 就是个哈希表，它里面是个dictEntry 的二维数组，而 dictEntry 是个包含了 key-value 结构之外还有一个 next 指针，因此可以将哈希冲突的以链表的形式保存下来。<br>在重点说下重哈希，可能同样写 Java 的同学对这个比较有感觉，跟 HashMap 一样，会以 2 的 N 次方进行扩容，那么扩容的方法就会比较简单，每个键重哈希要不就在原来这个槽，要不就在原来的槽加原 dictht.size 的位置；然后是重头戏，具体是怎么做扩容呢，其实这里就把第二个 ht 用上了，其实这两个hashtable 的具体作用有点类似于 jvm 中的两个 survival 区，但是又不全一样，因为 redis 在扩容的时候是采用的渐进式地重哈希，什么叫渐进式的呢，就是它不是像 jvm 那种标记复制的模式直接将一个 eden 区和原来的 survival 区存活的对象复制到另一个 survival 区，而是在每一次添加，删除，查找或者更新操作时，都会额外的帮忙搬运一部分的原 dictht 中的数据，这里会根据 rehashidx 的值来判断，如果是-1 表示并没有在重哈希中，如果是 0 表示开始重哈希了，然后rehashidx 还会随着每次的帮忙搬运往上加，但全部被搬运完成后 rehashidx 又变回了-1，又可以扯到Java 中的 Concurrent HashMap, 他在扩容的时候也使用了类似的操作。</p>
 
       
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+  <span itemprop="copyrightYear">2021</span>
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-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/12/18/1Q84%E8%AF%BB%E5%90%8E%E6%84%9F/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/12/21/%E8%81%8A%E8%81%8AJava%E4%B8%AD%E7%9A%84%E5%8D%95%E4%BE%8B%E6%A8%A1%E5%BC%8F/">
 
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-            <a href="/2019/12/18/1Q84%E8%AF%BB%E5%90%8E%E6%84%9F/" class="post-title-link" itemprop="url">村上春树《1Q84》读后感</a>
+            <a href="/2019/12/21/%E8%81%8A%E8%81%8AJava%E4%B8%AD%E7%9A%84%E5%8D%95%E4%BE%8B%E6%A8%A1%E5%BC%8F/" class="post-title-link" itemprop="url">聊聊Java中的单例模式</a>
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@@ -228,14 +228,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2019-12-18 00:33:09" itemprop="dateCreated datePublished" datetime="2019-12-18T00:33:09+08:00">2019-12-18</time>
+              <time title="Created: 2019-12-21 01:03:09" itemprop="dateCreated datePublished" datetime="2019-12-21T01:03:09+08:00">2019-12-21</time>
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-                <time title="Modified: 2019-12-19 00:08:42" itemprop="dateModified" datetime="2019-12-19T00:08:42+08:00">2019-12-19</time>
+                <time title="Modified: 2019-12-22 08:46:11" itemprop="dateModified" datetime="2019-12-22T08:46:11+08:00">2019-12-22</time>
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-                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
+                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
                 </span>
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-                  <a href="/categories/%E8%AF%BB%E5%90%8E%E6%84%9F/" itemprop="url" rel="index"><span itemprop="name">读后感</span></a>
+                  <a href="/categories/Java/Design-Patterns/" itemprop="url" rel="index"><span itemprop="name">Design Patterns</span></a>
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+                  <a href="/categories/Java/Singleton/" itemprop="url" rel="index"><span itemprop="name">Singleton</span></a>
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-            <span id="/2019/12/18/1Q84%E8%AF%BB%E5%90%8E%E6%84%9F/" class="post-meta-item leancloud_visitors" data-flag-title="村上春树《1Q84》读后感" title="Views">
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-          <p>看完了村上春树的《1Q84》，这应该是第五本看的他的书了，继 跑步，挪威的森林，刺杀骑士团长，海边的卡夫卡之后，不是其中最长的，好像是海边的卡夫卡还是刺杀骑士团长比较长一点，都是在微信读书上看的，比较方便，最开始在上面看的是高晓松的《鱼羊野史》，不知道为啥取这个名字，但是还是满吸引我的，不过由于去年的种种，没有很多心思把它看完，而且本身的组织形式就是比较松散的，看到哪算哪，其实一些野史部分是我比较喜欢，有些谈到人物的就不太有兴趣，而且类似于大祥哥吃的东西，反正都是哇，怎么这么好吃，嗯，太爱（niu）你（bi）了，高晓松就是这个人是我最喜欢的 xxx 家，我也没去细究过他有没有说重复过，反正是不太爱，后来因为这书还一度对战争史有了浓厚的兴趣，然而事实告诉我，大部头的战争史，其实正史我是真的啃不下去，我可能只对其中 10%的内容感兴趣，不过终于也在今年把它看完了，好像高晓松的晓说也最终季了，貌似其中讲朝鲜战争的还被和谐了，看样子是说出了一些故事（truth）。</p>
-<p>本来只是想把 《1Q84》的读后感写下，现在觉得还是把这篇当成我今年的读书总结吧，不过先从《1Q84》说起。</p>
-<p>严格来讲，这不是很书面化的读后感，可能我想写的也只是像聊天一样的说下我读过的书，包括的技术博客其实也是类似的，以后或许会转变，但是目前水平如此吧，写多了可能会变好，也可能不会。</p>
-<p>开始正文吧，这书有点类似于海边的卡夫卡，一开始是通过两条故事线，穿插着叙述，一条是青豆的，不算是个职业杀手的女杀手，要去解决一个经常家暴的斯文败类，穿着描述得比较性感吧，杀人方式是通过比较长的细针，从脖子后面一个精巧的位置插入，可以造成是未知原因死亡的假象，可能会推断成心梗之类的，这里有个前置的细节，就是青豆是乘坐一辆很高级的出租车，内饰什么的都非常有质感，有点不像一辆出租车，然后车里放了一首比较小众的歌，雅纳切克的《小交响曲》，但是青豆知道它，这跟后面的情节也有些许关系，这是女主人公青豆的出场；相应的男主的出场印象不是太深刻，男主叫天吾，是个不知名的作家，跟一个叫小松的编辑有比较好的关系，虽然天吾还没有拿到比较有分量的奖项，但是小松很看好他，也让他帮忙审校一个新作家奖的投稿文章，虽然天吾自身还没获得过这个奖，天吾还有个正式工作，是当数学老师，天吾在学生时代是个数学天才，但后面有对文学产生了兴趣，文学还不足以养活自己，靠着教课还是能保持温饱；</p>
-<p>接下来是正式故事的起点了，就是小松收到了一部小说投稿，名叫《空气蛹》，是个叫深绘里的女孩子投的稿，小松对他赋予了很高的评价，这里好像记岔了，好像是天吾对这部小说很有好感，但是小松比较怀疑，然后小松看了之后也有了浓厚的兴趣，这里就是开端了，小松想让天吾来重写润色这部《空气蛹》，因为故事本身很有分量，但是描写手法叙事方式等都很拙劣，而天吾正好擅长这个，小松对天吾的评价是，描写技巧无可挑剔，就是故事主体的火花还没际遇迸发，需要一个导火索，这个就可以类比我们程序员，很多比较初中级的程序员主要擅长在原来的代码上修修改改或者给他分配个小功能，比较高级的程序员就需要能做一些项目的架构设计，核心的技术方案设计，以前我也觉得写文档这个比较无聊，但是当一个项目真的比较庞大，复杂的时候，整体和核心部分的架构设计和方案还是需要有文档沉淀的，不然别人不知道没法接受，自己过段时间也会忘记。</p>
-<p>对于小松的这个建议，他的初衷是想搅一搅这个死气沉沉套路颇深的文坛，因为本身《空气蛹》这部小说的内容很吸引人，小松想通过天吾的润色补充让这部小说冲击新人奖，有种恶作剧的意图，天吾对此表示很多担心和顾虑，小松的这个建议其实也是一种文学作假，有两方面的担心，一方面是原作者深绘里是否同意如此操作，一方面是外界如果发现了这个事实会有什么样的后果，但是小松表示不用担心，前一步由小松牵线，让天吾跟原作者深绘里当面沟通这个代写是否被允许，结果当然是被允许了，这里有了对深绘里的初步描写，按我的理解是比较仙的感觉，然后语言沟通有些吃力，或者说有她自己的特色，当面沟通时貌似是让深绘里回去再考虑下，然后后面再由天吾去深绘里寄宿的戎野老师家沟通具体的细节。</p>
-<p>2019年12月18日23:37:19 更新<br>去到戎野老师家之后，天吾知道了关于深绘里的一些事情，深绘里的父亲与戎野老师应该是老友，深绘里的父亲在当初成立了一个叫”先驱”的公社，一个独立运行的社会组织，以运营农场作为物资来源，追求更为松散的共同体，即不过分激进地公有制，进行松散的共同生活，承认私有财产，简而言之就是这样一个能稳定存活下来的独立社会组织，但是随着稳定运行，内部的激进派和稳健派开始出现分歧，不可磨合，后来两派就分裂了，深绘里的父亲，深田保留在了稳健派，但是此时其实深田保内心是矛盾的，以为一开始其实是他倡导的独立革命才组织起了这群人，然而现在他又认清了现实社会已经不太相信能通过革命来独立的可能性，后来激进派便开始越加封闭，而且进行军事训练和思想教育，而后这个先驱的激进派别便有了新的名字”黎明”，深绘里也是在此时从先驱逃离来投靠戎野老师<br>暂时先写到这，未完待续~</p>
+          <p>这是个 Java 面试的高频问题，我也遇到过，以往都是觉得这类题没意思，网上一搜一大堆，也不愿意记，其实说回来，主要还是没静下心来好好去理解，今天无意中看到一个课程，基本帮我把一些疑惑的点讲清楚了，首先单例是啥意思，这个其实是有范围一说，比如我起了个<code>Spring Boot</code>应用，在这个应用范围内，我的常规 bean 是单例的，意味着 getBean 的时候其实永远只会拿到那一个对象，那要怎么来写一个单例呢，首先就是传说中的饿汉模式，也是最简单的</p>
+<h2 id="饿汉模式"><a href="#饿汉模式" class="headerlink" title="饿汉模式"></a>饿汉模式</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Singleton1</span> </span>&#123;</span><br><span class="line">    <span class="comment">// 首先，将构造方法变成私有的</span></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="title">Singleton1</span><span class="params">()</span> </span>&#123;&#125;;</span><br><span class="line">    <span class="comment">// 创建私有静态实例，这样第一次使用的时候就会进行创建</span></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> Singleton instance = <span class="keyword">new</span> Singleton1();</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 使用这个对象都是通过这个 getInstance 来获取</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Singleton1 <span class="title">getInstance</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> instance;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">// 瞎写一个静态方法。这里想说的是，如果我们只是要调用 Singleton.getDate(...)，</span></span><br><span class="line">    <span class="comment">// 本来是不想要生成 Singleton 实例的，不过没办法，已经生成了</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Date <span class="title">getDate</span><span class="params">(String mode)</span> </span>&#123;<span class="keyword">return</span> <span class="keyword">new</span> Date();&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>上面借鉴了一些代码，其实这是最基本，也不会错的方法，但是正如其中<code>getDate</code>方法里说的问题，有时候并没有想那这个对象，但是因为我调用了这个类的静态方法，导致对象已经生成了，可能这也是饿汉模式名字的来由，不管三七二十一给你生成个单例就完事了，不管有没有用，但是这种个人觉得也没啥大问题，如果是面试的话最好说出来它的缺点</p>
+<h2 id="饱汉模式"><a href="#饱汉模式" class="headerlink" title="饱汉模式"></a>饱汉模式</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Singleton2</span> </span>&#123;</span><br><span class="line">    <span class="comment">// 首先，也是先堵死 new Singleton() 这条路,将构造方法变成私有</span></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="title">Singleton2</span><span class="params">()</span> </span>&#123;&#125;</span><br><span class="line">    <span class="comment">// 和饿汉模式相比，这边不需要先实例化出来，注意这里的 volatile，它是必须的</span></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">volatile</span> Singleton2 instance = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> m = <span class="number">9</span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Singleton <span class="title">getInstance</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (instance == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="comment">// 加锁</span></span><br><span class="line">            <span class="keyword">synchronized</span> (Singleton2<span class="class">.<span class="keyword">class</span>) </span>&#123;</span><br><span class="line">                <span class="comment">// 这一次判断也是必须的，不然会有并发问题</span></span><br><span class="line">                <span class="keyword">if</span> (instance == <span class="keyword">null</span>) &#123;</span><br><span class="line">                    instance = <span class="keyword">new</span> Singleton2();</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> instance;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>这里容易错的有三点，理解了其实就比较好记了</p>
+<p>第一点，为啥不在 getInstance 上整个代码块加 <code>synchronized</code>，这个其实比较容易理解，就是锁的力度太大，性能太差了，这点其实也要去理解，可以举个夸张的例子，比如我一个电商的服务，如果为了避免一个人的订单出现问题，是不是可以从请求入口就把他锁住，到请求结束释放，那么里面做的事情都有保障，然而这显然不可能，因为我们想要这种竞态条件抢占资源的时间尽量减少，防止其他线程等待。<br>第二点，为啥<code>synchronized</code>之已经检查了 <code>instance == null</code>,还要在里面再检查一次，这个有个术语，叫 <code>double check lock</code>,但是为啥要这么做呢，其实很简单，想象当有两个线程，都过了第一步为空判断，这个时候只有一个线程能拿到这个锁，另一个线程就等待了，如果不再判断一次，那么第一个线程新建完对象释放锁之后，第二个线程又能拿到锁，再去创建一个对象。<br>第三点，为啥要<code>volatile</code>关键字，原先对它的理解是它修饰的变量在 JMM 中能及时将变量值写到主存中，但是它还有个很重要的作用，就是防止指令重排序，<code>instance = new Singleton();</code>这行代码其实在底层是分成三条指令执行的，第一条是在堆上申请了一块内存放这个对象，但是对象的字段啥的都还是默认值，第二条是设置对象的值，比如上面的 m 是 9，然后第三条是将这个对象和虚拟机栈上的指针建立引用关联，那么如果我不用<code>volatile</code>关键字，这三条指令就有可能出现重排，比如变成了 1-3-2 这种顺序，当执行完第二步时，有个线程来访问这个对象了，先判断是不是空，发现不是空的，就拿去直接用了，是不是就出现问题了，所以这个<code>volatile</code>也是不可缺少的</p>
+<h2 id="嵌套类"><a href="#嵌套类" class="headerlink" title="嵌套类"></a>嵌套类</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Singleton3</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="title">Singleton3</span><span class="params">()</span> </span>&#123;&#125;</span><br><span class="line">    <span class="comment">// 主要是使用了 嵌套类可以访问外部类的静态属性和静态方法 的特性</span></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">Holder</span> </span>&#123;</span><br><span class="line">        <span class="keyword">private</span> <span class="keyword">static</span> Singleton3 instance = <span class="keyword">new</span> Singleton3();</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Singleton3 <span class="title">getInstance</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> Holder.instance;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>这个我个人感觉是饿汉模式的升级版，可以在调用<code>getInstance</code>的时候去实例化对象，也是比较推荐的</p>
+<h2 id="枚举单例"><a href="#枚举单例" class="headerlink" title="枚举单例"></a>枚举单例</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">enum</span> Singleton &#123;</span><br><span class="line">    INSTANCE;</span><br><span class="line">    </span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doSomething</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="comment">//todo doSomething</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>枚举很特殊，它在类加载的时候会初始化里面的所有的实例，而且 JVM 保证了它们不会再被实例化，所以它天生就是单例的。</p>
 
       
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-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/12/10/Redis-Part-1/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/12/18/1Q84%E8%AF%BB%E5%90%8E%E6%84%9F/">
 
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-            <a href="/2019/12/10/Redis-Part-1/" class="post-title-link" itemprop="url">Redis_分布式锁</a>
+            <a href="/2019/12/18/1Q84%E8%AF%BB%E5%90%8E%E6%84%9F/" class="post-title-link" itemprop="url">村上春树《1Q84》读后感</a>
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               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2019-12-10 23:26:26" itemprop="dateCreated datePublished" datetime="2019-12-10T23:26:26+08:00">2019-12-10</time>
+              <time title="Created: 2019-12-18 00:33:09" itemprop="dateCreated datePublished" datetime="2019-12-18T00:33:09+08:00">2019-12-18</time>
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                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
+                <time title="Modified: 2019-12-19 00:08:42" itemprop="dateModified" datetime="2019-12-19T00:08:42+08:00">2019-12-19</time>
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-                  <a href="/categories/Redis/" itemprop="url" rel="index"><span itemprop="name">Redis</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Redis/Distributed-Lock/" itemprop="url" rel="index"><span itemprop="name">Distributed Lock</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
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                   , 
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-                  <a href="/categories/C/" itemprop="url" rel="index"><span itemprop="name">C</span></a>
+                  <a href="/categories/%E8%AF%BB%E5%90%8E%E6%84%9F/" itemprop="url" rel="index"><span itemprop="name">读后感</span></a>
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-                  <a href="/categories/C/Redis/" itemprop="url" rel="index"><span itemprop="name">Redis</span></a>
+                  <a href="/categories/%E8%AF%BB%E5%90%8E%E6%84%9F/%E6%9D%91%E4%B8%8A%E6%98%A5%E6%A0%91/" itemprop="url" rel="index"><span itemprop="name">村上春树</span></a>
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-            <span id="/2019/12/10/Redis-Part-1/" class="post-meta-item leancloud_visitors" data-flag-title="Redis_分布式锁" title="Views">
+            <span id="/2019/12/18/1Q84%E8%AF%BB%E5%90%8E%E6%84%9F/" class="post-meta-item leancloud_visitors" data-flag-title="村上春树《1Q84》读后感" title="Views">
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-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/12/10/Redis-Part-1/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2019/12/18/1Q84%E8%AF%BB%E5%90%8E%E6%84%9F/#disqus_thread" itemprop="discussionUrl">
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-          <p>今天看了一下 <code>redis</code> 分布式锁 <code>redlock</code> 的实现，简单记录下，</p>
-<h2 id="加锁"><a href="#加锁" class="headerlink" title="加锁"></a>加锁</h2><p>原先我对 <code>redis</code> 锁的概念就是加锁使用 <code>setnx</code>，解锁使用 <code>lua</code> 脚本，但是 <code>setnx</code> 具体是啥，<code>lua</code> 脚本是啥不是很清楚<br>首先简单思考下这个问题，首先为啥不是先 <code>get</code> 一下 <code>key</code> 存不存在，然后再 <code>set</code> 一个 <code>key value</code>，因为加锁这个操作我们是要保证两点，一个是不能中途被打断，也就是说要原子性，如果是先 <code>get</code> 一下 <code>key</code>，如果不存在再 <code>set</code> 值的话，那就不是原子操作了；第二个是可不可以直接 <code>set</code> 值呢，显然不行，锁要保证唯一性，有且只能有一个线程或者其他应用单位获得该锁，正好 <code>setnx</code> 给了我们这种原子命令</p>
-<p>然后是 <code>setnx</code> 的键和值分别是啥，键比较容易想到是要锁住的资源，比如 <code>user_id</code>, 这里有个我自己之前比较容易陷进去的误区，但是这个误区后<br>面再说，这里其实是把<code>user_id</code> 作为要锁住的资源，在我获得锁的时候别的线程不允许操作，以此保证业务的正确性，不会被多个线程同时修改，确定了键，再来看看值是啥，其实原先我认为值是啥都没关系，我只要锁住了，光键就够我用了，但是考虑下多个线程的问题，如果我这个线程加了锁，然后我因为 <code>gc</code> 停顿等原因卡死了，这个时候<code>redis</code> 的锁或者说就是 <code>redis</code> 的缓存已经过期了，这时候另一个线程获得锁成功，然后我这个线程又活过来了，然后我就仍然认为我拿着锁，我去对数据进行修改或者释放锁，是不是就出现问题了，所以是不是我们还需要一个东西来区分这个锁是哪个线程加的，所以我们可以将值设置成为一个线程独有识别的值，至少在相对长的一段时间内不会重复。</p>
-<p>上面其实还有两个问题，一个是当 <code>gc</code> 超时时，我这个线程如何知道我手里的锁已经过期了，一种方法是我在加好锁之后就维护一个超时时间，这里其实还有个问题，不过跟第二个问题相关，就一起说了，就是设置超时时间，有些对于不是锁的 <code>redis</code> 缓存操作可以是先设置好值，然后在设置过期时间，那么这就又有上面说到的不是原子性的问题，那么就需要在同一条指令里把超时时间也设置了，幸好 <code>redis</code> 提供了这种支持</p>
-<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">SET resource_name my_random_value NX PX 30000</span><br></pre></td></tr></table></figure>
-<p>这里借鉴一下解释下，<code>resource_name</code>就是 key，代表要锁住的东西，<code>my_random_value</code>就是识别我这个线程的，<code>NX</code>代表只有在不存在的时候才设置，然后<code>PX 30000</code>表示超时时间是 30秒自动过期</p>
-<p>PS：记录下我原先有的一个误区，是不是要用 key 来区分加锁的线程，这样只有一个用处，就是自身线程可以识别是否是自己加的锁，但是最大的问题是别的线程不知道，其实这个用户的出发点是我在担心前面提过的一个问题，就是当 gc 停顿后，我要去判断当前的这个锁是否是我加的，还有就是当释放锁的时候，如果保证不会错误释放了其他线程加的锁，但是这样附带很多其他问题，最大的就是其他线程怎么知道能不能加这个锁。</p>
-<h2 id="解锁"><a href="#解锁" class="headerlink" title="解锁"></a>解锁</h2><p>当线程在锁过期之前就处理完了业务逻辑，那就可以提前释放这个锁，那么提前释放要怎么操作，直接<code>del key</code>显然是不行的，因为这样就是我前面想用线程随机值加资源名作为锁的初衷，我不能去释放别的线程加的锁，那么我要怎么办呢，先 <code>get</code> 一下看是不是我的？那又变成非原子的操作了，幸好redis 也考虑到了这个问题，给了<code>lua</code> 脚本来操作这种</p>
-<figure class="highlight lua"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> redis.call(<span class="string">"get"</span>,KEYS[<span class="number">1</span>]) == ARGV[<span class="number">1</span>] <span class="keyword">then</span></span><br><span class="line">    <span class="keyword">return</span> redis.call(<span class="string">"del"</span>,KEYS[<span class="number">1</span>])</span><br><span class="line"><span class="keyword">else</span></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span></span><br><span class="line"><span class="keyword">end</span></span><br></pre></td></tr></table></figure>
-<p>这里的<code>KEYS[1]</code>就是前面加锁的<code>resource_name</code>,<code>ARGV[1]</code>就是线程的随机值<code>my_random_value</code></p>
-<h2 id="多节点"><a href="#多节点" class="headerlink" title="多节点"></a>多节点</h2><p>前面说的其实是单节点 <code>redis</code> 作为分布式锁的情况，那么当我们的 <code>redis</code> 有多节点的情况呢，如果多节点下处于加锁或者解锁或者锁有效情况下<br><code>redis</code> 的某个节点宕掉了怎么办，这里就有一些需要思考的地方，是否单独搞一个单节点的 <code>redis</code>作为分布式锁专用的，但是如果这个单节点的挂了呢，还有就是成本问题，所以我们需要一个多节点的分布式锁方案<br>这里就引出了开头说到的<code>redlock</code>，这个可是 <code>redis</code>的作者写的, 他的加锁过程是分以下几步去做这个事情</p>
-<ul>
-<li>获取当前时间（毫秒数）。</li>
-<li>按顺序依次向N个Redis节点执行获取锁的操作。这个获取操作跟前面基于单Redis节点的获取锁的过程相同，包含随机字符串my_random_value，也包含过期时间(比如PX 30000，即锁的有效时间)。为了保证在某个Redis节点不可用的时候算法能够继续运行，这个获取锁的操作还有一个超时时间(time out)，它要远小于锁的有效时间（几十毫秒量级）。客户端在向某个Redis节点获取锁失败以后，应该立即尝试下一个Redis节点。这里的失败，应该包含任何类型的失败，比如该Redis节点不可用，或者该Redis节点上的锁已经被其它客户端持有（注：Redlock原文中这里只提到了Redis节点不可用的情况，但也应该包含其它的失败情况）。</li>
-<li>计算整个获取锁的过程总共消耗了多长时间，计算方法是用当前时间减去第1步记录的时间。如果客户端从大多数Redis节点（&gt;= N/2+1）成功获取到了锁，并且获取锁总共消耗的时间没有超过锁的有效时间(lock validity time)，那么这时客户端才认为最终获取锁成功；否则，认为最终获取锁失败。</li>
-<li>如果最终获取锁成功了，那么这个锁的有效时间应该重新计算，它等于最初的锁的有效时间减去第3步计算出来的获取锁消耗的时间。</li>
-<li>如果最终获取锁失败了（可能由于获取到锁的Redis节点个数少于N/2+1，或者整个获取锁的过程消耗的时间超过了锁的最初有效时间），那么客户端应该立即向所有Redis节点发起释放锁的操作（即前面介绍的Redis Lua脚本）。<br>释放锁的过程比较简单：客户端向所有Redis节点发起释放锁的操作，不管这些节点当时在获取锁的时候成功与否。这里为什么要向所有的节点发送释放锁的操作呢，这里是因为有部分的节点的失败原因可能是加锁时阻塞，加锁成功的结果没有及时返回，所以为了防止这种情况还是需要向所有发起这个释放锁的操作。<br>初步记录就先到这。</li>
-</ul>
+          <p>看完了村上春树的《1Q84》，这应该是第五本看的他的书了，继 跑步，挪威的森林，刺杀骑士团长，海边的卡夫卡之后，不是其中最长的，好像是海边的卡夫卡还是刺杀骑士团长比较长一点，都是在微信读书上看的，比较方便，最开始在上面看的是高晓松的《鱼羊野史》，不知道为啥取这个名字，但是还是满吸引我的，不过由于去年的种种，没有很多心思把它看完，而且本身的组织形式就是比较松散的，看到哪算哪，其实一些野史部分是我比较喜欢，有些谈到人物的就不太有兴趣，而且类似于大祥哥吃的东西，反正都是哇，怎么这么好吃，嗯，太爱（niu）你（bi）了，高晓松就是这个人是我最喜欢的 xxx 家，我也没去细究过他有没有说重复过，反正是不太爱，后来因为这书还一度对战争史有了浓厚的兴趣，然而事实告诉我，大部头的战争史，其实正史我是真的啃不下去，我可能只对其中 10%的内容感兴趣，不过终于也在今年把它看完了，好像高晓松的晓说也最终季了，貌似其中讲朝鲜战争的还被和谐了，看样子是说出了一些故事（truth）。</p>
+<p>本来只是想把 《1Q84》的读后感写下，现在觉得还是把这篇当成我今年的读书总结吧，不过先从《1Q84》说起。</p>
+<p>严格来讲，这不是很书面化的读后感，可能我想写的也只是像聊天一样的说下我读过的书，包括的技术博客其实也是类似的，以后或许会转变，但是目前水平如此吧，写多了可能会变好，也可能不会。</p>
+<p>开始正文吧，这书有点类似于海边的卡夫卡，一开始是通过两条故事线，穿插着叙述，一条是青豆的，不算是个职业杀手的女杀手，要去解决一个经常家暴的斯文败类，穿着描述得比较性感吧，杀人方式是通过比较长的细针，从脖子后面一个精巧的位置插入，可以造成是未知原因死亡的假象，可能会推断成心梗之类的，这里有个前置的细节，就是青豆是乘坐一辆很高级的出租车，内饰什么的都非常有质感，有点不像一辆出租车，然后车里放了一首比较小众的歌，雅纳切克的《小交响曲》，但是青豆知道它，这跟后面的情节也有些许关系，这是女主人公青豆的出场；相应的男主的出场印象不是太深刻，男主叫天吾，是个不知名的作家，跟一个叫小松的编辑有比较好的关系，虽然天吾还没有拿到比较有分量的奖项，但是小松很看好他，也让他帮忙审校一个新作家奖的投稿文章，虽然天吾自身还没获得过这个奖，天吾还有个正式工作，是当数学老师，天吾在学生时代是个数学天才，但后面有对文学产生了兴趣，文学还不足以养活自己，靠着教课还是能保持温饱；</p>
+<p>接下来是正式故事的起点了，就是小松收到了一部小说投稿，名叫《空气蛹》，是个叫深绘里的女孩子投的稿，小松对他赋予了很高的评价，这里好像记岔了，好像是天吾对这部小说很有好感，但是小松比较怀疑，然后小松看了之后也有了浓厚的兴趣，这里就是开端了，小松想让天吾来重写润色这部《空气蛹》，因为故事本身很有分量，但是描写手法叙事方式等都很拙劣，而天吾正好擅长这个，小松对天吾的评价是，描写技巧无可挑剔，就是故事主体的火花还没际遇迸发，需要一个导火索，这个就可以类比我们程序员，很多比较初中级的程序员主要擅长在原来的代码上修修改改或者给他分配个小功能，比较高级的程序员就需要能做一些项目的架构设计，核心的技术方案设计，以前我也觉得写文档这个比较无聊，但是当一个项目真的比较庞大，复杂的时候，整体和核心部分的架构设计和方案还是需要有文档沉淀的，不然别人不知道没法接受，自己过段时间也会忘记。</p>
+<p>对于小松的这个建议，他的初衷是想搅一搅这个死气沉沉套路颇深的文坛，因为本身《空气蛹》这部小说的内容很吸引人，小松想通过天吾的润色补充让这部小说冲击新人奖，有种恶作剧的意图，天吾对此表示很多担心和顾虑，小松的这个建议其实也是一种文学作假，有两方面的担心，一方面是原作者深绘里是否同意如此操作，一方面是外界如果发现了这个事实会有什么样的后果，但是小松表示不用担心，前一步由小松牵线，让天吾跟原作者深绘里当面沟通这个代写是否被允许，结果当然是被允许了，这里有了对深绘里的初步描写，按我的理解是比较仙的感觉，然后语言沟通有些吃力，或者说有她自己的特色，当面沟通时貌似是让深绘里回去再考虑下，然后后面再由天吾去深绘里寄宿的戎野老师家沟通具体的细节。</p>
+<p>2019年12月18日23:37:19 更新<br>去到戎野老师家之后，天吾知道了关于深绘里的一些事情，深绘里的父亲与戎野老师应该是老友，深绘里的父亲在当初成立了一个叫”先驱”的公社，一个独立运行的社会组织，以运营农场作为物资来源，追求更为松散的共同体，即不过分激进地公有制，进行松散的共同生活，承认私有财产，简而言之就是这样一个能稳定存活下来的独立社会组织，但是随着稳定运行，内部的激进派和稳健派开始出现分歧，不可磨合，后来两派就分裂了，深绘里的父亲，深田保留在了稳健派，但是此时其实深田保内心是矛盾的，以为一开始其实是他倡导的独立革命才组织起了这群人，然而现在他又认清了现实社会已经不太相信能通过革命来独立的可能性，后来激进派便开始越加封闭，而且进行军事训练和思想教育，而后这个先驱的激进派别便有了新的名字”黎明”，深绘里也是在此时从先驱逃离来投靠戎野老师<br>暂时先写到这，未完待续~</p>
 
       
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@@ -441,7 +429,7 @@
   
   
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-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/12/07/JVM-G1-Part-1/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/12/10/Redis-Part-1/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
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@@ -455,7 +443,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2019/12/07/JVM-G1-Part-1/" class="post-title-link" itemprop="url">JVM源码分析之G1垃圾收集器分析一</a>
+            <a href="/2019/12/10/Redis-Part-1/" class="post-title-link" itemprop="url">Redis_分布式锁</a>
         </h2>
 
         <div class="post-meta">
@@ -465,14 +453,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2019-12-07 00:54:19" itemprop="dateCreated datePublished" datetime="2019-12-07T00:54:19+08:00">2019-12-07</time>
+              <time title="Created: 2019-12-10 23:26:26" itemprop="dateCreated datePublished" datetime="2019-12-10T23:26:26+08:00">2019-12-10</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2019-12-20 00:01:42" itemprop="dateModified" datetime="2019-12-20T00:01:42+08:00">2019-12-20</time>
+                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
               </span>
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@@ -480,24 +468,24 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
+                  <a href="/categories/Redis/" itemprop="url" rel="index"><span itemprop="name">Redis</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/JVM/" itemprop="url" rel="index"><span itemprop="name">JVM</span></a>
+                  <a href="/categories/Redis/Distributed-Lock/" itemprop="url" rel="index"><span itemprop="name">Distributed Lock</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/GC/" itemprop="url" rel="index"><span itemprop="name">GC</span></a>
+                  <a href="/categories/C/" itemprop="url" rel="index"><span itemprop="name">C</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/C/" itemprop="url" rel="index"><span itemprop="name">C++</span></a>
+                  <a href="/categories/C/Redis/" itemprop="url" rel="index"><span itemprop="name">Redis</span></a>
                 </span>
             </span>
 
           
-            <span id="/2019/12/07/JVM-G1-Part-1/" class="post-meta-item leancloud_visitors" data-flag-title="JVM源码分析之G1垃圾收集器分析一" title="Views">
+            <span id="/2019/12/10/Redis-Part-1/" class="post-meta-item leancloud_visitors" data-flag-title="Redis_分布式锁" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
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@@ -512,8 +500,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2019/12/07/JVM-G1-Part-1/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/12/07/JVM-G1-Part-1/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2019/12/10/Redis-Part-1/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/12/10/Redis-Part-1/" itemprop="commentCount"></span>
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-          <p>对 Java 的 gc 实现比较感兴趣，原先一般都是看周志明的书，但其实并没有讲具体的 gc 源码，而是把整个思路和流程讲解了一下<br>特别是 G1 的具体实现<br>一般对 G1 的理解其实就是把原先整块的新生代老年代分成了以 region 为单位的小块内存，简而言之，就是原先对新生代老年代的收集会涉及到整个代的堆内存空间，而G1 把它变成了更细致的小块内存<br>这带来了一个很明显的好处和一个很明显的坏处，好处是内存收集可以更灵活，耗时会变短，但整个收集的处理复杂度就变高了<br>目前看了一点点关于 G1 收集的预期时间相关的代码</p>
-<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">HeapWord* <span class="title">G1CollectedHeap::do_collection_pause</span><span class="params">(<span class="keyword">size_t</span> word_size,</span></span></span><br><span class="line"><span class="function"><span class="params">                                               uint gc_count_before,</span></span></span><br><span class="line"><span class="function"><span class="params">                                               <span class="keyword">bool</span>* succeeded,</span></span></span><br><span class="line"><span class="function"><span class="params">                                               GCCause::Cause gc_cause)</span> </span>&#123;</span><br><span class="line">  assert_heap_not_locked_and_not_at_safepoint();</span><br><span class="line">  <span class="function">VM_G1CollectForAllocation <span class="title">op</span><span class="params">(word_size,</span></span></span><br><span class="line"><span class="function"><span class="params">                               gc_count_before,</span></span></span><br><span class="line"><span class="function"><span class="params">                               gc_cause,</span></span></span><br><span class="line"><span class="function"><span class="params">                               <span class="literal">false</span>, <span class="comment">/* should_initiate_conc_mark */</span></span></span></span><br><span class="line"><span class="function"><span class="params">                               g1_policy()-&gt;max_pause_time_ms())</span></span>;</span><br><span class="line">  VMThread::execute(&amp;op);</span><br><span class="line"></span><br><span class="line">  HeapWord* result = op.result();</span><br><span class="line">  <span class="keyword">bool</span> ret_succeeded = op.prologue_succeeded() &amp;&amp; op.pause_succeeded();</span><br><span class="line">  assert(result == <span class="literal">NULL</span> || ret_succeeded,</span><br><span class="line">         <span class="string">"the result should be NULL if the VM did not succeed"</span>);</span><br><span class="line">  *succeeded = ret_succeeded;</span><br><span class="line"></span><br><span class="line">  assert_heap_not_locked();</span><br><span class="line">  <span class="keyword">return</span> result;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>这里就是收集时需要停顿的，其中<code>VMThread::execute(&amp;op);</code>是具体执行的，真正执行的是<code>VM_G1CollectForAllocation::doit</code>方法</p>
-<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">VM_G1CollectForAllocation::doit</span><span class="params">()</span> </span>&#123;</span><br><span class="line">  G1CollectedHeap* g1h = G1CollectedHeap::heap();</span><br><span class="line">  assert(!_should_initiate_conc_mark || g1h-&gt;should_do_concurrent_full_gc(_gc_cause),</span><br><span class="line">      <span class="string">"only a GC locker, a System.gc(), stats update, whitebox, or a hum allocation induced GC should start a cycle"</span>);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">if</span> (_word_size &gt; <span class="number">0</span>) &#123;</span><br><span class="line">    <span class="comment">// An allocation has been requested. So, try to do that first.</span></span><br><span class="line">    _result = g1h-&gt;attempt_allocation_at_safepoint(_word_size,</span><br><span class="line">                                                   <span class="literal">false</span> <span class="comment">/* expect_null_cur_alloc_region */</span>);</span><br><span class="line">    <span class="keyword">if</span> (_result != <span class="literal">NULL</span>) &#123;</span><br><span class="line">      <span class="comment">// If we can successfully allocate before we actually do the</span></span><br><span class="line">      <span class="comment">// pause then we will consider this pause successful.</span></span><br><span class="line">      _pause_succeeded = <span class="literal">true</span>;</span><br><span class="line">      <span class="keyword">return</span>;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="function">GCCauseSetter <span class="title">x</span><span class="params">(g1h, _gc_cause)</span></span>;</span><br><span class="line">  <span class="keyword">if</span> (_should_initiate_conc_mark) &#123;</span><br><span class="line">    <span class="comment">// It's safer to read old_marking_cycles_completed() here, given</span></span><br><span class="line">    <span class="comment">// that noone else will be updating it concurrently. Since we'll</span></span><br><span class="line">    <span class="comment">// only need it if we're initiating a marking cycle, no point in</span></span><br><span class="line">    <span class="comment">// setting it earlier.</span></span><br><span class="line">    _old_marking_cycles_completed_before = g1h-&gt;old_marking_cycles_completed();</span><br><span class="line"></span><br><span class="line">    <span class="comment">// At this point we are supposed to start a concurrent cycle. We</span></span><br><span class="line">    <span class="comment">// will do so if one is not already in progress.</span></span><br><span class="line">    <span class="keyword">bool</span> res = g1h-&gt;g1_policy()-&gt;force_initial_mark_if_outside_cycle(_gc_cause);</span><br><span class="line"></span><br><span class="line">    <span class="comment">// The above routine returns true if we were able to force the</span></span><br><span class="line">    <span class="comment">// next GC pause to be an initial mark; it returns false if a</span></span><br><span class="line">    <span class="comment">// marking cycle is already in progress.</span></span><br><span class="line">    <span class="comment">//</span></span><br><span class="line">    <span class="comment">// If a marking cycle is already in progress just return and skip the</span></span><br><span class="line">    <span class="comment">// pause below - if the reason for requesting this initial mark pause</span></span><br><span class="line">    <span class="comment">// was due to a System.gc() then the requesting thread should block in</span></span><br><span class="line">    <span class="comment">// doit_epilogue() until the marking cycle is complete.</span></span><br><span class="line">    <span class="comment">//</span></span><br><span class="line">    <span class="comment">// If this initial mark pause was requested as part of a humongous</span></span><br><span class="line">    <span class="comment">// allocation then we know that the marking cycle must just have</span></span><br><span class="line">    <span class="comment">// been started by another thread (possibly also allocating a humongous</span></span><br><span class="line">    <span class="comment">// object) as there was no active marking cycle when the requesting</span></span><br><span class="line">    <span class="comment">// thread checked before calling collect() in</span></span><br><span class="line">    <span class="comment">// attempt_allocation_humongous(). Retrying the GC, in this case,</span></span><br><span class="line">    <span class="comment">// will cause the requesting thread to spin inside collect() until the</span></span><br><span class="line">    <span class="comment">// just started marking cycle is complete - which may be a while. So</span></span><br><span class="line">    <span class="comment">// we do NOT retry the GC.</span></span><br><span class="line">    <span class="keyword">if</span> (!res) &#123;</span><br><span class="line">      assert(_word_size == <span class="number">0</span>, <span class="string">"Concurrent Full GC/Humongous Object IM shouldn't be allocating"</span>);</span><br><span class="line">      <span class="keyword">if</span> (_gc_cause != GCCause::_g1_humongous_allocation) &#123;</span><br><span class="line">        _should_retry_gc = <span class="literal">true</span>;</span><br><span class="line">      &#125;</span><br><span class="line">      <span class="keyword">return</span>;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="comment">// Try a partial collection of some kind.</span></span><br><span class="line">  _pause_succeeded = g1h-&gt;do_collection_pause_at_safepoint(_target_pause_time_ms);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">if</span> (_pause_succeeded) &#123;</span><br><span class="line">    <span class="keyword">if</span> (_word_size &gt; <span class="number">0</span>) &#123;</span><br><span class="line">      <span class="comment">// An allocation had been requested. Do it, eventually trying a stronger</span></span><br><span class="line">      <span class="comment">// kind of GC.</span></span><br><span class="line">      _result = g1h-&gt;satisfy_failed_allocation(_word_size, &amp;_pause_succeeded);</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">      <span class="keyword">bool</span> should_upgrade_to_full = !g1h-&gt;should_do_concurrent_full_gc(_gc_cause) &amp;&amp;</span><br><span class="line">                                    !g1h-&gt;has_regions_left_for_allocation();</span><br><span class="line">      <span class="keyword">if</span> (should_upgrade_to_full) &#123;</span><br><span class="line">        <span class="comment">// There has been a request to perform a GC to free some space. We have no</span></span><br><span class="line">        <span class="comment">// information on how much memory has been asked for. In case there are</span></span><br><span class="line">        <span class="comment">// absolutely no regions left to allocate into, do a maximally compacting full GC.</span></span><br><span class="line">        log_info(gc, ergo)(<span class="string">"Attempting maximally compacting collection"</span>);</span><br><span class="line">        _pause_succeeded = g1h-&gt;do_full_collection(<span class="literal">false</span>, <span class="comment">/* explicit gc */</span></span><br><span class="line">                                                   <span class="literal">true</span>   <span class="comment">/* clear_all_soft_refs */</span>);</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    guarantee(_pause_succeeded, <span class="string">"Elevated collections during the safepoint must always succeed."</span>);</span><br><span class="line">  &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">    assert(_result == <span class="literal">NULL</span>, <span class="string">"invariant"</span>);</span><br><span class="line">    <span class="comment">// The only reason for the pause to not be successful is that, the GC locker is</span></span><br><span class="line">    <span class="comment">// active (or has become active since the prologue was executed). In this case</span></span><br><span class="line">    <span class="comment">// we should retry the pause after waiting for the GC locker to become inactive.</span></span><br><span class="line">    _should_retry_gc = <span class="literal">true</span>;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>这里可以看到核心的是<code>G1CollectedHeap::do_collection_pause_at_safepoint</code>这个方法，它带上了目标暂停时间的值</p>
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class="line">G1CollectedHeap::do_collection_pause_at_safepoint(<span class="keyword">double</span> target_pause_time_ms) &#123;</span><br><span class="line">  assert_at_safepoint_on_vm_thread();</span><br><span class="line">  guarantee(!is_gc_active(), <span class="string">"collection is not reentrant"</span>);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">if</span> (GCLocker::check_active_before_gc()) &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  _gc_timer_stw-&gt;register_gc_start();</span><br><span class="line"></span><br><span class="line">  GCIdMark gc_id_mark;</span><br><span class="line">  _gc_tracer_stw-&gt;report_gc_start(gc_cause(), _gc_timer_stw-&gt;gc_start());</span><br><span class="line"></span><br><span class="line">  <span class="function">SvcGCMarker <span class="title">sgcm</span><span class="params">(SvcGCMarker::MINOR)</span></span>;</span><br><span class="line">  ResourceMark rm;</span><br><span class="line"></span><br><span class="line">  g1_policy()-&gt;note_gc_start();</span><br><span class="line"></span><br><span class="line">  wait_for_root_region_scanning();</span><br><span class="line"></span><br><span class="line">  print_heap_before_gc();</span><br><span class="line">  print_heap_regions();</span><br><span class="line">  trace_heap_before_gc(_gc_tracer_stw);</span><br><span class="line"></span><br><span class="line">  _verifier-&gt;verify_region_sets_optional();</span><br><span class="line">  _verifier-&gt;verify_dirty_young_regions();</span><br><span class="line"></span><br><span class="line">  <span class="comment">// We should not be doing initial mark unless the conc mark thread is running</span></span><br><span class="line">  <span class="keyword">if</span> (!_cm_thread-&gt;should_terminate()) &#123;</span><br><span class="line">    <span class="comment">// This call will decide whether this pause is an initial-mark</span></span><br><span class="line">    <span class="comment">// pause. If it is, in_initial_mark_gc() will return true</span></span><br><span class="line">    <span class="comment">// for the duration of this pause.</span></span><br><span class="line">    g1_policy()-&gt;decide_on_conc_mark_initiation();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="comment">// We do not allow initial-mark to be piggy-backed on a mixed GC.</span></span><br><span class="line">  assert(!collector_state()-&gt;in_initial_mark_gc() ||</span><br><span class="line">          collector_state()-&gt;in_young_only_phase(), <span class="string">"sanity"</span>);</span><br><span class="line"></span><br><span class="line">  <span class="comment">// We also do not allow mixed GCs during marking.</span></span><br><span class="line">  assert(!collector_state()-&gt;mark_or_rebuild_in_progress() || collector_state()-&gt;in_young_only_phase(), <span class="string">"sanity"</span>);</span><br><span class="line"></span><br><span class="line">  <span class="comment">// Record whether this pause is an initial mark. When the current</span></span><br><span class="line">  <span class="comment">// thread has completed its logging output and it's safe to signal</span></span><br><span class="line">  <span class="comment">// the CM thread, the flag's value in the policy has been reset.</span></span><br><span class="line">  <span class="keyword">bool</span> should_start_conc_mark = collector_state()-&gt;in_initial_mark_gc();</span><br><span class="line"></span><br><span class="line">  <span class="comment">// Inner scope for scope based logging, timers, and stats collection</span></span><br><span class="line">  &#123;</span><br><span class="line">    EvacuationInfo evacuation_info;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (collector_state()-&gt;in_initial_mark_gc()) &#123;</span><br><span class="line">      <span class="comment">// We are about to start a marking cycle, so we increment the</span></span><br><span class="line">      <span class="comment">// full collection counter.</span></span><br><span class="line">      increment_old_marking_cycles_started();</span><br><span class="line">      _cm-&gt;gc_tracer_cm()-&gt;set_gc_cause(gc_cause());</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    _gc_tracer_stw-&gt;report_yc_type(collector_state()-&gt;yc_type());</span><br><span class="line"></span><br><span class="line">    GCTraceCPUTime tcpu;</span><br><span class="line"></span><br><span class="line">    G1HeapVerifier::G1VerifyType verify_type;</span><br><span class="line">    <span class="function">FormatBuffer&lt;&gt; <span class="title">gc_string</span><span class="params">(<span class="string">"Pause Young "</span>)</span></span>;</span><br><span class="line">    <span class="keyword">if</span> (collector_state()-&gt;in_initial_mark_gc()) &#123;</span><br><span class="line">      gc_string.append(<span class="string">"(Concurrent Start)"</span>);</span><br><span class="line">      verify_type = G1HeapVerifier::G1VerifyConcurrentStart;</span><br><span class="line">    &#125; <span class="keyword">else</span> <span class="keyword">if</span> (collector_state()-&gt;in_young_only_phase()) &#123;</span><br><span class="line">      <span class="keyword">if</span> (collector_state()-&gt;in_young_gc_before_mixed()) &#123;</span><br><span class="line">        gc_string.append(<span class="string">"(Prepare Mixed)"</span>);</span><br><span class="line">      &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        gc_string.append(<span class="string">"(Normal)"</span>);</span><br><span class="line">      &#125;</span><br><span class="line">      verify_type = G1HeapVerifier::G1VerifyYoungNormal;</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">      gc_string.append(<span class="string">"(Mixed)"</span>);</span><br><span class="line">      verify_type = G1HeapVerifier::G1VerifyMixed;</span><br><span class="line">    &#125;</span><br><span class="line">    GCTraceTime(Info, gc) tm(gc_string, <span class="literal">NULL</span>, gc_cause(), <span class="literal">true</span>);</span><br><span class="line"></span><br><span class="line">    uint active_workers = AdaptiveSizePolicy::calc_active_workers(workers()-&gt;total_workers(),</span><br><span class="line">                                                                  workers()-&gt;active_workers(),</span><br><span class="line">                                                                  Threads::number_of_non_daemon_threads());</span><br><span class="line">    active_workers = workers()-&gt;update_active_workers(active_workers);</span><br><span class="line">    log_info(gc,task)(<span class="string">"Using %u workers of %u for evacuation"</span>, active_workers, workers()-&gt;total_workers());</span><br><span class="line"></span><br><span class="line">    <span class="function">TraceCollectorStats <span class="title">tcs</span><span class="params">(g1mm()-&gt;incremental_collection_counters())</span></span>;</span><br><span class="line">    <span class="function">TraceMemoryManagerStats <span class="title">tms</span><span class="params">(&amp;_memory_manager, gc_cause(),</span></span></span><br><span class="line"><span class="function"><span class="params">                                collector_state()-&gt;yc_type() == Mixed <span class="comment">/* allMemoryPoolsAffected */</span>)</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="function">G1HeapTransition <span class="title">heap_transition</span><span class="params">(<span class="keyword">this</span>)</span></span>;</span><br><span class="line">    <span class="keyword">size_t</span> heap_used_bytes_before_gc = used();</span><br><span class="line"></span><br><span class="line">    <span class="comment">// Don't dynamically change the number of GC threads this early.  A value of</span></span><br><span class="line">    <span class="comment">// 0 is used to indicate serial work.  When parallel work is done,</span></span><br><span class="line">    <span class="comment">// it will be set.</span></span><br><span class="line"></span><br><span class="line">    &#123; <span class="comment">// Call to jvmpi::post_class_unload_events must occur outside of active GC</span></span><br><span class="line">      IsGCActiveMark x;</span><br><span class="line"></span><br><span class="line">      gc_prologue(<span class="literal">false</span>);</span><br><span class="line"></span><br><span class="line">      <span class="keyword">if</span> (VerifyRememberedSets) &#123;</span><br><span class="line">        log_info(gc, verify)(<span class="string">"[Verifying RemSets before GC]"</span>);</span><br><span class="line">        VerifyRegionRemSetClosure v_cl;</span><br><span class="line">        heap_region_iterate(&amp;v_cl);</span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">      _verifier-&gt;verify_before_gc(verify_type);</span><br><span class="line"></span><br><span class="line">      _verifier-&gt;check_bitmaps(<span class="string">"GC Start"</span>);</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">if</span> COMPILER2_OR_JVMCI</span></span><br><span class="line">      DerivedPointerTable::<span class="built_in">clear</span>();</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"></span><br><span class="line">      <span class="comment">// Please see comment in g1CollectedHeap.hpp and</span></span><br><span class="line">      <span class="comment">// G1CollectedHeap::ref_processing_init() to see how</span></span><br><span class="line">      <span class="comment">// reference processing currently works in G1.</span></span><br><span class="line"></span><br><span class="line">      <span class="comment">// Enable discovery in the STW reference processor</span></span><br><span class="line">      _ref_processor_stw-&gt;enable_discovery();</span><br><span class="line"></span><br><span class="line">      &#123;</span><br><span class="line">        <span class="comment">// We want to temporarily turn off discovery by the</span></span><br><span class="line">        <span class="comment">// CM ref processor, if necessary, and turn it back on</span></span><br><span class="line">        <span class="comment">// on again later if we do. Using a scoped</span></span><br><span class="line">        <span class="comment">// NoRefDiscovery object will do this.</span></span><br><span class="line">        <span class="function">NoRefDiscovery <span class="title">no_cm_discovery</span><span class="params">(_ref_processor_cm)</span></span>;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// Forget the current alloc region (we might even choose it to be part</span></span><br><span class="line">        <span class="comment">// of the collection set!).</span></span><br><span class="line">        _allocator-&gt;release_mutator_alloc_region();</span><br><span class="line"></span><br><span class="line">        <span class="comment">// This timing is only used by the ergonomics to handle our pause target.</span></span><br><span class="line">        <span class="comment">// It is unclear why this should not include the full pause. We will</span></span><br><span class="line">        <span class="comment">// investigate this in CR 7178365.</span></span><br><span class="line">        <span class="comment">//</span></span><br><span class="line">        <span class="comment">// Preserving the old comment here if that helps the investigation:</span></span><br><span class="line">        <span class="comment">//</span></span><br><span class="line">        <span class="comment">// The elapsed time induced by the start time below deliberately elides</span></span><br><span class="line">        <span class="comment">// the possible verification above.</span></span><br><span class="line">        <span class="keyword">double</span> sample_start_time_sec = os::elapsedTime();</span><br><span class="line"></span><br><span class="line">        g1_policy()-&gt;record_collection_pause_start(sample_start_time_sec);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (collector_state()-&gt;in_initial_mark_gc()) &#123;</span><br><span class="line">          concurrent_mark()-&gt;pre_initial_mark();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        g1_policy()-&gt;finalize_collection_set(target_pause_time_ms, &amp;_survivor);</span><br><span class="line"></span><br><span class="line">        evacuation_info.set_collectionset_regions(collection_set()-&gt;region_length());</span><br><span class="line"></span><br><span class="line">        <span class="comment">// Make sure the remembered sets are up to date. This needs to be</span></span><br><span class="line">        <span class="comment">// done before register_humongous_regions_with_cset(), because the</span></span><br><span class="line">        <span class="comment">// remembered sets are used there to choose eager reclaim candidates.</span></span><br><span class="line">        <span class="comment">// If the remembered sets are not up to date we might miss some</span></span><br><span class="line">        <span class="comment">// entries that need to be handled.</span></span><br><span class="line">        g1_rem_set()-&gt;cleanupHRRS();</span><br><span class="line"></span><br><span class="line">        register_humongous_regions_with_cset();</span><br><span class="line"></span><br><span class="line">        assert(_verifier-&gt;check_cset_fast_test(), <span class="string">"Inconsistency in the InCSetState table."</span>);</span><br><span class="line"></span><br><span class="line">        <span class="comment">// We call this after finalize_cset() to</span></span><br><span class="line">        <span class="comment">// ensure that the CSet has been finalized.</span></span><br><span class="line">        _cm-&gt;verify_no_cset_oops();</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (_hr_printer.is_active()) &#123;</span><br><span class="line">          <span class="function">G1PrintCollectionSetClosure <span class="title">cl</span><span class="params">(&amp;_hr_printer)</span></span>;</span><br><span class="line">          _collection_set.iterate(&amp;cl);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// Initialize the GC alloc regions.</span></span><br><span class="line">        _allocator-&gt;init_gc_alloc_regions(evacuation_info);</span><br><span class="line"></span><br><span class="line">        <span class="function">G1ParScanThreadStateSet <span class="title">per_thread_states</span><span class="params">(<span class="keyword">this</span>, workers()-&gt;active_workers(), collection_set()-&gt;young_region_length())</span></span>;</span><br><span class="line">        pre_evacuate_collection_set();</span><br><span class="line"></span><br><span class="line">        <span class="comment">// Actually do the work...</span></span><br><span class="line">        evacuate_collection_set(&amp;per_thread_states);</span><br><span class="line"></span><br><span class="line">        post_evacuate_collection_set(evacuation_info, &amp;per_thread_states);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">const</span> <span class="keyword">size_t</span>* surviving_young_words = per_thread_states.surviving_young_words();</span><br><span class="line">        free_collection_set(&amp;_collection_set, evacuation_info, surviving_young_words);</span><br><span class="line"></span><br><span class="line">        eagerly_reclaim_humongous_regions();</span><br><span class="line"></span><br><span class="line">        record_obj_copy_mem_stats();</span><br><span class="line">        _survivor_evac_stats.adjust_desired_plab_sz();</span><br><span class="line">        _old_evac_stats.adjust_desired_plab_sz();</span><br><span class="line"></span><br><span class="line">        <span class="keyword">double</span> start = os::elapsedTime();</span><br><span class="line">        start_new_collection_set();</span><br><span class="line">        g1_policy()-&gt;phase_times()-&gt;record_start_new_cset_time_ms((os::elapsedTime() - start) * <span class="number">1000.0</span>);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (evacuation_failed()) &#123;</span><br><span class="line">          set_used(recalculate_used());</span><br><span class="line">          <span class="keyword">if</span> (_archive_allocator != <span class="literal">NULL</span>) &#123;</span><br><span class="line">            _archive_allocator-&gt;clear_used();</span><br><span class="line">          &#125;</span><br><span class="line">          <span class="keyword">for</span> (uint i = <span class="number">0</span>; i &lt; ParallelGCThreads; i++) &#123;</span><br><span class="line">            <span class="keyword">if</span> (_evacuation_failed_info_array[i].has_failed()) &#123;</span><br><span class="line">              _gc_tracer_stw-&gt;report_evacuation_failed(_evacuation_failed_info_array[i]);</span><br><span class="line">            &#125;</span><br><span class="line">          &#125;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">          <span class="comment">// The "used" of the the collection set have already been subtracted</span></span><br><span class="line">          <span class="comment">// when they were freed.  Add in the bytes evacuated.</span></span><br><span class="line">          increase_used(g1_policy()-&gt;bytes_copied_during_gc());</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (collector_state()-&gt;in_initial_mark_gc()) &#123;</span><br><span class="line">          <span class="comment">// We have to do this before we notify the CM threads that</span></span><br><span class="line">          <span class="comment">// they can start working to make sure that all the</span></span><br><span class="line">          <span class="comment">// appropriate initialization is done on the CM object.</span></span><br><span class="line">          concurrent_mark()-&gt;post_initial_mark();</span><br><span class="line">          <span class="comment">// Note that we don't actually trigger the CM thread at</span></span><br><span class="line">          <span class="comment">// this point. We do that later when we're sure that</span></span><br><span class="line">          <span class="comment">// the current thread has completed its logging output.</span></span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        allocate_dummy_regions();</span><br><span class="line"></span><br><span class="line">        _allocator-&gt;init_mutator_alloc_region();</span><br><span class="line"></span><br><span class="line">        &#123;</span><br><span class="line">          <span class="keyword">size_t</span> expand_bytes = _heap_sizing_policy-&gt;expansion_amount();</span><br><span class="line">          <span class="keyword">if</span> (expand_bytes &gt; <span class="number">0</span>) &#123;</span><br><span class="line">            <span class="keyword">size_t</span> bytes_before = capacity();</span><br><span class="line">            <span class="comment">// No need for an ergo logging here,</span></span><br><span class="line">            <span class="comment">// expansion_amount() does this when it returns a value &gt; 0.</span></span><br><span class="line">            <span class="keyword">double</span> expand_ms;</span><br><span class="line">            <span class="keyword">if</span> (!expand(expand_bytes, _workers, &amp;expand_ms)) &#123;</span><br><span class="line">              <span class="comment">// We failed to expand the heap. Cannot do anything about it.</span></span><br><span class="line">            &#125;</span><br><span class="line">            g1_policy()-&gt;phase_times()-&gt;record_expand_heap_time(expand_ms);</span><br><span class="line">          &#125;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// We redo the verification but now wrt to the new CSet which</span></span><br><span class="line">        <span class="comment">// has just got initialized after the previous CSet was freed.</span></span><br><span class="line">        _cm-&gt;verify_no_cset_oops();</span><br><span class="line"></span><br><span class="line">        <span class="comment">// This timing is only used by the ergonomics to handle our pause target.</span></span><br><span class="line">        <span class="comment">// It is unclear why this should not include the full pause. We will</span></span><br><span class="line">        <span class="comment">// investigate this in CR 7178365.</span></span><br><span class="line">        <span class="keyword">double</span> sample_end_time_sec = os::elapsedTime();</span><br><span class="line">        <span class="keyword">double</span> pause_time_ms = (sample_end_time_sec - sample_start_time_sec) * MILLIUNITS;</span><br><span class="line">        <span class="keyword">size_t</span> total_cards_scanned = g1_policy()-&gt;phase_times()-&gt;sum_thread_work_items(G1GCPhaseTimes::ScanRS, G1GCPhaseTimes::ScanRSScannedCards);</span><br><span class="line">        g1_policy()-&gt;record_collection_pause_end(pause_time_ms, total_cards_scanned, heap_used_bytes_before_gc);</span><br><span class="line"></span><br><span class="line">        evacuation_info.set_collectionset_used_before(collection_set()-&gt;bytes_used_before());</span><br><span class="line">        evacuation_info.set_bytes_copied(g1_policy()-&gt;bytes_copied_during_gc());</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (VerifyRememberedSets) &#123;</span><br><span class="line">          log_info(gc, verify)(<span class="string">"[Verifying RemSets after GC]"</span>);</span><br><span class="line">          VerifyRegionRemSetClosure v_cl;</span><br><span class="line">          heap_region_iterate(&amp;v_cl);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        _verifier-&gt;verify_after_gc(verify_type);</span><br><span class="line">        _verifier-&gt;check_bitmaps(<span class="string">"GC End"</span>);</span><br><span class="line"></span><br><span class="line">        assert(!_ref_processor_stw-&gt;discovery_enabled(), <span class="string">"Postcondition"</span>);</span><br><span class="line">        _ref_processor_stw-&gt;verify_no_references_recorded();</span><br><span class="line"></span><br><span class="line">        <span class="comment">// CM reference discovery will be re-enabled if necessary.</span></span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> TRACESPINNING</span></span><br><span class="line">      ParallelTaskTerminator::print_termination_counts();</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"></span><br><span class="line">      gc_epilogue(<span class="literal">false</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// Print the remainder of the GC log output.</span></span><br><span class="line">    <span class="keyword">if</span> (evacuation_failed()) &#123;</span><br><span class="line">      log_info(gc)(<span class="string">"To-space exhausted"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    g1_policy()-&gt;print_phases();</span><br><span class="line">    heap_transition.<span class="built_in">print</span>();</span><br><span class="line"></span><br><span class="line">    <span class="comment">// It is not yet to safe to tell the concurrent mark to</span></span><br><span class="line">    <span class="comment">// start as we have some optional output below. We don't want the</span></span><br><span class="line">    <span class="comment">// output from the concurrent mark thread interfering with this</span></span><br><span class="line">    <span class="comment">// logging output either.</span></span><br><span class="line"></span><br><span class="line">    _hrm.verify_optional();</span><br><span class="line">    _verifier-&gt;verify_region_sets_optional();</span><br><span class="line"></span><br><span class="line">    TASKQUEUE_STATS_ONLY(print_taskqueue_stats());</span><br><span class="line">    TASKQUEUE_STATS_ONLY(reset_taskqueue_stats());</span><br><span class="line"></span><br><span class="line">    print_heap_after_gc();</span><br><span class="line">    print_heap_regions();</span><br><span class="line">    trace_heap_after_gc(_gc_tracer_stw);</span><br><span class="line"></span><br><span class="line">    <span class="comment">// We must call G1MonitoringSupport::update_sizes() in the same scoping level</span></span><br><span class="line">    <span class="comment">// as an active TraceMemoryManagerStats object (i.e. before the destructor for the</span></span><br><span class="line">    <span class="comment">// TraceMemoryManagerStats is called) so that the G1 memory pools are updated</span></span><br><span class="line">    <span class="comment">// before any GC notifications are raised.</span></span><br><span class="line">    g1mm()-&gt;update_sizes();</span><br><span class="line"></span><br><span class="line">    _gc_tracer_stw-&gt;report_evacuation_info(&amp;evacuation_info);</span><br><span class="line">    _gc_tracer_stw-&gt;report_tenuring_threshold(_g1_policy-&gt;tenuring_threshold());</span><br><span class="line">    _gc_timer_stw-&gt;register_gc_end();</span><br><span class="line">    _gc_tracer_stw-&gt;report_gc_end(_gc_timer_stw-&gt;gc_end(), _gc_timer_stw-&gt;time_partitions());</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="comment">// It should now be safe to tell the concurrent mark thread to start</span></span><br><span class="line">  <span class="comment">// without its logging output interfering with the logging output</span></span><br><span class="line">  <span class="comment">// that came from the pause.</span></span><br><span class="line"></span><br><span class="line">  <span class="keyword">if</span> (should_start_conc_mark) &#123;</span><br><span class="line">    <span class="comment">// CAUTION: after the doConcurrentMark() call below,</span></span><br><span class="line">    <span class="comment">// the concurrent marking thread(s) could be running</span></span><br><span class="line">    <span class="comment">// concurrently with us. Make sure that anything after</span></span><br><span class="line">    <span class="comment">// this point does not assume that we are the only GC thread</span></span><br><span class="line">    <span class="comment">// running. Note: of course, the actual marking work will</span></span><br><span class="line">    <span class="comment">// not start until the safepoint itself is released in</span></span><br><span class="line">    <span class="comment">// SuspendibleThreadSet::desynchronize().</span></span><br><span class="line">    do_concurrent_mark();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>往下走就是这一步<code>G1Policy::finalize_collection_set</code>,去处理新生代和老年代</p>
-<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">G1Policy::finalize_collection_set</span><span class="params">(<span class="keyword">double</span> target_pause_time_ms, G1SurvivorRegions* survivor)</span> </span>&#123;</span><br><span class="line">  <span class="keyword">double</span> time_remaining_ms = _collection_set-&gt;finalize_young_part(target_pause_time_ms, survivor);</span><br><span class="line">  _collection_set-&gt;finalize_old_part(time_remaining_ms);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>这里分别调用了两个方法，可以看到剩余时间是往下传的，来看一下具体的方法</p>
-<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">double</span> <span class="title">G1CollectionSet::finalize_young_part</span><span class="params">(<span class="keyword">double</span> target_pause_time_ms, G1SurvivorRegions* survivors)</span> </span>&#123;</span><br><span class="line">  <span class="keyword">double</span> young_start_time_sec = os::elapsedTime();</span><br><span class="line"></span><br><span class="line">  finalize_incremental_building();</span><br><span class="line"></span><br><span class="line">  guarantee(target_pause_time_ms &gt; <span class="number">0.0</span>,</span><br><span class="line">            <span class="string">"target_pause_time_ms = %1.6lf should be positive"</span>, target_pause_time_ms);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">size_t</span> pending_cards = _policy-&gt;pending_cards();</span><br><span class="line">  <span class="keyword">double</span> base_time_ms = _policy-&gt;predict_base_elapsed_time_ms(pending_cards);</span><br><span class="line">  <span class="keyword">double</span> time_remaining_ms = MAX2(target_pause_time_ms - base_time_ms, <span class="number">0.0</span>);</span><br><span class="line"></span><br><span class="line">  log_trace(gc, ergo, cset)(<span class="string">"Start choosing CSet. pending cards: "</span> SIZE_FORMAT <span class="string">" predicted base time: %1.2fms remaining time: %1.2fms target pause time: %1.2fms"</span>,</span><br><span class="line">                            pending_cards, base_time_ms, time_remaining_ms, target_pause_time_ms);</span><br><span class="line"></span><br><span class="line">  <span class="comment">// The young list is laid with the survivor regions from the previous</span></span><br><span class="line">  <span class="comment">// pause are appended to the RHS of the young list, i.e.</span></span><br><span class="line">  <span class="comment">//   [Newly Young Regions ++ Survivors from last pause].</span></span><br><span class="line"></span><br><span class="line">  uint survivor_region_length = survivors-&gt;length();</span><br><span class="line">  uint eden_region_length = _g1h-&gt;eden_regions_count();</span><br><span class="line">  init_region_lengths(eden_region_length, survivor_region_length);</span><br><span class="line"></span><br><span class="line">  verify_young_cset_indices();</span><br><span class="line"></span><br><span class="line">  <span class="comment">// Clear the fields that point to the survivor list - they are all young now.</span></span><br><span class="line">  survivors-&gt;convert_to_eden();</span><br><span class="line"></span><br><span class="line">  _bytes_used_before = _inc_bytes_used_before;</span><br><span class="line">  time_remaining_ms = MAX2(time_remaining_ms - _inc_predicted_elapsed_time_ms, <span class="number">0.0</span>);</span><br><span class="line"></span><br><span class="line">  log_trace(gc, ergo, cset)(<span class="string">"Add young regions to CSet. eden: %u regions, survivors: %u regions, predicted young region time: %1.2fms, target pause time: %1.2fms"</span>,</span><br><span class="line">                            eden_region_length, survivor_region_length, _inc_predicted_elapsed_time_ms, target_pause_time_ms);</span><br><span class="line"></span><br><span class="line">  <span class="comment">// The number of recorded young regions is the incremental</span></span><br><span class="line">  <span class="comment">// collection set's current size</span></span><br><span class="line">  set_recorded_rs_lengths(_inc_recorded_rs_lengths);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">double</span> young_end_time_sec = os::elapsedTime();</span><br><span class="line">  phase_times()-&gt;record_young_cset_choice_time_ms((young_end_time_sec - young_start_time_sec) * <span class="number">1000.0</span>);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">return</span> time_remaining_ms;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>下面是老年代的部分</p>
-<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">G1CollectionSet::finalize_old_part</span><span class="params">(<span class="keyword">double</span> time_remaining_ms)</span> </span>&#123;</span><br><span class="line">  <span class="keyword">double</span> non_young_start_time_sec = os::elapsedTime();</span><br><span class="line">  <span class="keyword">double</span> predicted_old_time_ms = <span class="number">0.0</span>;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">if</span> (collector_state()-&gt;in_mixed_phase()) &#123;</span><br><span class="line">    cset_chooser()-&gt;verify();</span><br><span class="line">    <span class="keyword">const</span> uint min_old_cset_length = _policy-&gt;calc_min_old_cset_length();</span><br><span class="line">    <span class="keyword">const</span> uint max_old_cset_length = _policy-&gt;calc_max_old_cset_length();</span><br><span class="line"></span><br><span class="line">    uint expensive_region_num = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">bool</span> check_time_remaining = _policy-&gt;adaptive_young_list_length();</span><br><span class="line"></span><br><span class="line">    HeapRegion* hr = cset_chooser()-&gt;<span class="built_in">peek</span>();</span><br><span class="line">    <span class="keyword">while</span> (hr != <span class="literal">NULL</span>) &#123;</span><br><span class="line">      <span class="keyword">if</span> (old_region_length() &gt;= max_old_cset_length) &#123;</span><br><span class="line">        <span class="comment">// Added maximum number of old regions to the CSet.</span></span><br><span class="line">        log_debug(gc, ergo, cset)(<span class="string">"Finish adding old regions to CSet (old CSet region num reached max). old %u regions, max %u regions"</span>,</span><br><span class="line">                                  old_region_length(), max_old_cset_length);</span><br><span class="line">        <span class="keyword">break</span>;</span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">      <span class="comment">// Stop adding regions if the remaining reclaimable space is</span></span><br><span class="line">      <span class="comment">// not above G1HeapWastePercent.</span></span><br><span class="line">      <span class="keyword">size_t</span> reclaimable_bytes = cset_chooser()-&gt;remaining_reclaimable_bytes();</span><br><span class="line">      <span class="keyword">double</span> reclaimable_percent = _policy-&gt;reclaimable_bytes_percent(reclaimable_bytes);</span><br><span class="line">      <span class="keyword">double</span> threshold = (<span class="keyword">double</span>) G1HeapWastePercent;</span><br><span class="line">      <span class="keyword">if</span> (reclaimable_percent &lt;= threshold) &#123;</span><br><span class="line">        <span class="comment">// We've added enough old regions that the amount of uncollected</span></span><br><span class="line">        <span class="comment">// reclaimable space is at or below the waste threshold. Stop</span></span><br><span class="line">        <span class="comment">// adding old regions to the CSet.</span></span><br><span class="line">        log_debug(gc, ergo, cset)(<span class="string">"Finish adding old regions to CSet (reclaimable percentage not over threshold). "</span></span><br><span class="line">                                  <span class="string">"old %u regions, max %u regions, reclaimable: "</span> SIZE_FORMAT <span class="string">"B (%1.2f%%) threshold: "</span> UINTX_FORMAT <span class="string">"%%"</span>,</span><br><span class="line">                                  old_region_length(), max_old_cset_length, reclaimable_bytes, reclaimable_percent, G1HeapWastePercent);</span><br><span class="line">        <span class="keyword">break</span>;</span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">      <span class="keyword">double</span> predicted_time_ms = predict_region_elapsed_time_ms(hr);</span><br><span class="line">      <span class="keyword">if</span> (check_time_remaining) &#123;</span><br><span class="line">        <span class="keyword">if</span> (predicted_time_ms &gt; time_remaining_ms) &#123;</span><br><span class="line">          <span class="comment">// Too expensive for the current CSet.</span></span><br><span class="line"></span><br><span class="line">          <span class="keyword">if</span> (old_region_length() &gt;= min_old_cset_length) &#123;</span><br><span class="line">            <span class="comment">// We have added the minimum number of old regions to the CSet,</span></span><br><span class="line">            <span class="comment">// we are done with this CSet.</span></span><br><span class="line">            log_debug(gc, ergo, cset)(<span class="string">"Finish adding old regions to CSet (predicted time is too high). "</span></span><br><span class="line">                                      <span class="string">"predicted time: %1.2fms, remaining time: %1.2fms old %u regions, min %u regions"</span>,</span><br><span class="line">                                      predicted_time_ms, time_remaining_ms, old_region_length(), min_old_cset_length);</span><br><span class="line">            <span class="keyword">break</span>;</span><br><span class="line">          &#125;</span><br><span class="line"></span><br><span class="line">          <span class="comment">// We'll add it anyway given that we haven't reached the</span></span><br><span class="line">          <span class="comment">// minimum number of old regions.</span></span><br><span class="line">          expensive_region_num += <span class="number">1</span>;</span><br><span class="line">        &#125;</span><br><span class="line">      &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="keyword">if</span> (old_region_length() &gt;= min_old_cset_length) &#123;</span><br><span class="line">          <span class="comment">// In the non-auto-tuning case, we'll finish adding regions</span></span><br><span class="line">          <span class="comment">// to the CSet if we reach the minimum.</span></span><br><span class="line"></span><br><span class="line">          log_debug(gc, ergo, cset)(<span class="string">"Finish adding old regions to CSet (old CSet region num reached min). old %u regions, min %u regions"</span>,</span><br><span class="line">                                    old_region_length(), min_old_cset_length);</span><br><span class="line">          <span class="keyword">break</span>;</span><br><span class="line">        &#125;</span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">      <span class="comment">// We will add this region to the CSet.</span></span><br><span class="line">      time_remaining_ms = MAX2(time_remaining_ms - predicted_time_ms, <span class="number">0.0</span>);</span><br><span class="line">      predicted_old_time_ms += predicted_time_ms;</span><br><span class="line">      cset_chooser()-&gt;pop(); <span class="comment">// already have region via peek()</span></span><br><span class="line">      _g1h-&gt;old_set_remove(hr);</span><br><span class="line">      add_old_region(hr);</span><br><span class="line"></span><br><span class="line">      hr = cset_chooser()-&gt;<span class="built_in">peek</span>();</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (hr == <span class="literal">NULL</span>) &#123;</span><br><span class="line">      log_debug(gc, ergo, cset)(<span class="string">"Finish adding old regions to CSet (candidate old regions not available)"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (expensive_region_num &gt; <span class="number">0</span>) &#123;</span><br><span class="line">      <span class="comment">// We print the information once here at the end, predicated on</span></span><br><span class="line">      <span class="comment">// whether we added any apparently expensive regions or not, to</span></span><br><span class="line">      <span class="comment">// avoid generating output per region.</span></span><br><span class="line">      log_debug(gc, ergo, cset)(<span class="string">"Added expensive regions to CSet (old CSet region num not reached min)."</span></span><br><span class="line">                                <span class="string">"old: %u regions, expensive: %u regions, min: %u regions, remaining time: %1.2fms"</span>,</span><br><span class="line">                                old_region_length(), expensive_region_num, min_old_cset_length, time_remaining_ms);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    cset_chooser()-&gt;verify();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  stop_incremental_building();</span><br><span class="line"></span><br><span class="line">  log_debug(gc, ergo, cset)(<span class="string">"Finish choosing CSet. old: %u regions, predicted old region time: %1.2fms, time remaining: %1.2f"</span>,</span><br><span class="line">                            old_region_length(), predicted_old_time_ms, time_remaining_ms);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">double</span> non_young_end_time_sec = os::elapsedTime();</span><br><span class="line">  phase_times()-&gt;record_non_young_cset_choice_time_ms((non_young_end_time_sec - non_young_start_time_sec) * <span class="number">1000.0</span>);</span><br><span class="line"></span><br><span class="line">  QuickSort::sort(_collection_set_regions, _collection_set_cur_length, compare_region_idx, <span class="literal">true</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>上面第三行是个判断，当前是否是 mixed 回收阶段，如果不是的话其实是没有老年代什么事的，所以可以看到代码基本是从这个 if 判断<br><code>if (collector_state()-&gt;in_mixed_phase()) {</code>开始往下走的<br>先写到这，偏向于做笔记用，有错轻拍</p>
+          <p>今天看了一下 <code>redis</code> 分布式锁 <code>redlock</code> 的实现，简单记录下，</p>
+<h2 id="加锁"><a href="#加锁" class="headerlink" title="加锁"></a>加锁</h2><p>原先我对 <code>redis</code> 锁的概念就是加锁使用 <code>setnx</code>，解锁使用 <code>lua</code> 脚本，但是 <code>setnx</code> 具体是啥，<code>lua</code> 脚本是啥不是很清楚<br>首先简单思考下这个问题，首先为啥不是先 <code>get</code> 一下 <code>key</code> 存不存在，然后再 <code>set</code> 一个 <code>key value</code>，因为加锁这个操作我们是要保证两点，一个是不能中途被打断，也就是说要原子性，如果是先 <code>get</code> 一下 <code>key</code>，如果不存在再 <code>set</code> 值的话，那就不是原子操作了；第二个是可不可以直接 <code>set</code> 值呢，显然不行，锁要保证唯一性，有且只能有一个线程或者其他应用单位获得该锁，正好 <code>setnx</code> 给了我们这种原子命令</p>
+<p>然后是 <code>setnx</code> 的键和值分别是啥，键比较容易想到是要锁住的资源，比如 <code>user_id</code>, 这里有个我自己之前比较容易陷进去的误区，但是这个误区后<br>面再说，这里其实是把<code>user_id</code> 作为要锁住的资源，在我获得锁的时候别的线程不允许操作，以此保证业务的正确性，不会被多个线程同时修改，确定了键，再来看看值是啥，其实原先我认为值是啥都没关系，我只要锁住了，光键就够我用了，但是考虑下多个线程的问题，如果我这个线程加了锁，然后我因为 <code>gc</code> 停顿等原因卡死了，这个时候<code>redis</code> 的锁或者说就是 <code>redis</code> 的缓存已经过期了，这时候另一个线程获得锁成功，然后我这个线程又活过来了，然后我就仍然认为我拿着锁，我去对数据进行修改或者释放锁，是不是就出现问题了，所以是不是我们还需要一个东西来区分这个锁是哪个线程加的，所以我们可以将值设置成为一个线程独有识别的值，至少在相对长的一段时间内不会重复。</p>
+<p>上面其实还有两个问题，一个是当 <code>gc</code> 超时时，我这个线程如何知道我手里的锁已经过期了，一种方法是我在加好锁之后就维护一个超时时间，这里其实还有个问题，不过跟第二个问题相关，就一起说了，就是设置超时时间，有些对于不是锁的 <code>redis</code> 缓存操作可以是先设置好值，然后在设置过期时间，那么这就又有上面说到的不是原子性的问题，那么就需要在同一条指令里把超时时间也设置了，幸好 <code>redis</code> 提供了这种支持</p>
+<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">SET resource_name my_random_value NX PX 30000</span><br></pre></td></tr></table></figure>
+<p>这里借鉴一下解释下，<code>resource_name</code>就是 key，代表要锁住的东西，<code>my_random_value</code>就是识别我这个线程的，<code>NX</code>代表只有在不存在的时候才设置，然后<code>PX 30000</code>表示超时时间是 30秒自动过期</p>
+<p>PS：记录下我原先有的一个误区，是不是要用 key 来区分加锁的线程，这样只有一个用处，就是自身线程可以识别是否是自己加的锁，但是最大的问题是别的线程不知道，其实这个用户的出发点是我在担心前面提过的一个问题，就是当 gc 停顿后，我要去判断当前的这个锁是否是我加的，还有就是当释放锁的时候，如果保证不会错误释放了其他线程加的锁，但是这样附带很多其他问题，最大的就是其他线程怎么知道能不能加这个锁。</p>
+<h2 id="解锁"><a href="#解锁" class="headerlink" title="解锁"></a>解锁</h2><p>当线程在锁过期之前就处理完了业务逻辑，那就可以提前释放这个锁，那么提前释放要怎么操作，直接<code>del key</code>显然是不行的，因为这样就是我前面想用线程随机值加资源名作为锁的初衷，我不能去释放别的线程加的锁，那么我要怎么办呢，先 <code>get</code> 一下看是不是我的？那又变成非原子的操作了，幸好redis 也考虑到了这个问题，给了<code>lua</code> 脚本来操作这种</p>
+<figure class="highlight lua"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> redis.call(<span class="string">"get"</span>,KEYS[<span class="number">1</span>]) == ARGV[<span class="number">1</span>] <span class="keyword">then</span></span><br><span class="line">    <span class="keyword">return</span> redis.call(<span class="string">"del"</span>,KEYS[<span class="number">1</span>])</span><br><span class="line"><span class="keyword">else</span></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span></span><br><span class="line"><span class="keyword">end</span></span><br></pre></td></tr></table></figure>
+<p>这里的<code>KEYS[1]</code>就是前面加锁的<code>resource_name</code>,<code>ARGV[1]</code>就是线程的随机值<code>my_random_value</code></p>
+<h2 id="多节点"><a href="#多节点" class="headerlink" title="多节点"></a>多节点</h2><p>前面说的其实是单节点 <code>redis</code> 作为分布式锁的情况，那么当我们的 <code>redis</code> 有多节点的情况呢，如果多节点下处于加锁或者解锁或者锁有效情况下<br><code>redis</code> 的某个节点宕掉了怎么办，这里就有一些需要思考的地方，是否单独搞一个单节点的 <code>redis</code>作为分布式锁专用的，但是如果这个单节点的挂了呢，还有就是成本问题，所以我们需要一个多节点的分布式锁方案<br>这里就引出了开头说到的<code>redlock</code>，这个可是 <code>redis</code>的作者写的, 他的加锁过程是分以下几步去做这个事情</p>
+<ul>
+<li>获取当前时间（毫秒数）。</li>
+<li>按顺序依次向N个Redis节点执行获取锁的操作。这个获取操作跟前面基于单Redis节点的获取锁的过程相同，包含随机字符串my_random_value，也包含过期时间(比如PX 30000，即锁的有效时间)。为了保证在某个Redis节点不可用的时候算法能够继续运行，这个获取锁的操作还有一个超时时间(time out)，它要远小于锁的有效时间（几十毫秒量级）。客户端在向某个Redis节点获取锁失败以后，应该立即尝试下一个Redis节点。这里的失败，应该包含任何类型的失败，比如该Redis节点不可用，或者该Redis节点上的锁已经被其它客户端持有（注：Redlock原文中这里只提到了Redis节点不可用的情况，但也应该包含其它的失败情况）。</li>
+<li>计算整个获取锁的过程总共消耗了多长时间，计算方法是用当前时间减去第1步记录的时间。如果客户端从大多数Redis节点（&gt;= N/2+1）成功获取到了锁，并且获取锁总共消耗的时间没有超过锁的有效时间(lock validity time)，那么这时客户端才认为最终获取锁成功；否则，认为最终获取锁失败。</li>
+<li>如果最终获取锁成功了，那么这个锁的有效时间应该重新计算，它等于最初的锁的有效时间减去第3步计算出来的获取锁消耗的时间。</li>
+<li>如果最终获取锁失败了（可能由于获取到锁的Redis节点个数少于N/2+1，或者整个获取锁的过程消耗的时间超过了锁的最初有效时间），那么客户端应该立即向所有Redis节点发起释放锁的操作（即前面介绍的Redis Lua脚本）。<br>释放锁的过程比较简单：客户端向所有Redis节点发起释放锁的操作，不管这些节点当时在获取锁的时候成功与否。这里为什么要向所有的节点发送释放锁的操作呢，这里是因为有部分的节点的失败原因可能是加锁时阻塞，加锁成功的结果没有及时返回，所以为了防止这种情况还是需要向所有发起这个释放锁的操作。<br>初步记录就先到这。</li>
+</ul>
 
       
     </div>
@@ -562,7 +555,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/09/23/AbstractQueuedSynchronizer/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/12/07/JVM-G1-Part-1/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -576,7 +569,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2019/09/23/AbstractQueuedSynchronizer/" class="post-title-link" itemprop="url">AbstractQueuedSynchronizer</a>
+            <a href="/2019/12/07/JVM-G1-Part-1/" class="post-title-link" itemprop="url">JVM源码分析之G1垃圾收集器分析一</a>
         </h2>
 
         <div class="post-meta">
@@ -586,14 +579,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2019-09-23 23:40:05" itemprop="dateCreated datePublished" datetime="2019-09-23T23:40:05+08:00">2019-09-23</time>
+              <time title="Created: 2019-12-07 00:54:19" itemprop="dateCreated datePublished" datetime="2019-12-07T00:54:19+08:00">2019-12-07</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
+                <time title="Modified: 2019-12-20 00:01:42" itemprop="dateModified" datetime="2019-12-20T00:01:42+08:00">2019-12-20</time>
               </span>
             <span class="post-meta-item">
               <span class="post-meta-item-icon">
@@ -601,12 +594,24 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/java/" itemprop="url" rel="index"><span itemprop="name">java</span></a>
+                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Java/JVM/" itemprop="url" rel="index"><span itemprop="name">JVM</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Java/GC/" itemprop="url" rel="index"><span itemprop="name">GC</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/C/" itemprop="url" rel="index"><span itemprop="name">C++</span></a>
                 </span>
             </span>
 
           
-            <span id="/2019/09/23/AbstractQueuedSynchronizer/" class="post-meta-item leancloud_visitors" data-flag-title="AbstractQueuedSynchronizer" title="Views">
+            <span id="/2019/12/07/JVM-G1-Part-1/" class="post-meta-item leancloud_visitors" data-flag-title="JVM源码分析之G1垃圾收集器分析一" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -621,8 +626,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2019/09/23/AbstractQueuedSynchronizer/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/09/23/AbstractQueuedSynchronizer/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2019/12/07/JVM-G1-Part-1/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/12/07/JVM-G1-Part-1/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -637,11 +642,19 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <p>最近看了大神的 AQS 的文章，之前总是断断续续地看一点，每次都知难而退，下次看又从头开始，昨天总算硬着头皮看完了第一部分<br>首先 AQS 只要有这些属性</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 头结点，你直接把它当做 当前持有锁的线程 可能是最好理解的</span></span><br><span class="line"><span class="keyword">private</span> <span class="keyword">transient</span> <span class="keyword">volatile</span> Node head;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 阻塞的尾节点，每个新的节点进来，都插入到最后，也就形成了一个链表</span></span><br><span class="line"><span class="keyword">private</span> <span class="keyword">transient</span> <span class="keyword">volatile</span> Node tail;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 这个是最重要的，代表当前锁的状态，0代表没有被占用，大于 0 代表有线程持有当前锁</span></span><br><span class="line"><span class="comment">// 这个值可以大于 1，是因为锁可以重入，每次重入都加上 1</span></span><br><span class="line"><span class="keyword">private</span> <span class="keyword">volatile</span> <span class="keyword">int</span> state;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 代表当前持有独占锁的线程，举个最重要的使用例子，因为锁可以重入</span></span><br><span class="line"><span class="comment">// reentrantLock.lock()可以嵌套调用多次，所以每次用这个来判断当前线程是否已经拥有了锁</span></span><br><span class="line"><span class="comment">// if (currentThread == getExclusiveOwnerThread()) &#123;state++&#125;</span></span><br><span class="line"><span class="keyword">private</span> <span class="keyword">transient</span> Thread exclusiveOwnerThread; <span class="comment">//继承自AbstractOwnableSynchronizer</span></span><br></pre></td></tr></table></figure>
-<p>大概了解了 aqs 底层的双向等待队列，<br>结构是这样的<br><img data-src="https://tva1.sinaimg.cn/large/006tNbRwly1g9mxu0ndt1j319o08w0t7.jpg" alt=""><br>每个 node 里面主要是的代码结构也比较简单</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">static</span> <span class="keyword">final</span> <span class="class"><span class="keyword">class</span> <span class="title">Node</span> </span>&#123;</span><br><span class="line">    <span class="comment">// 标识节点当前在共享模式下</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> Node SHARED = <span class="keyword">new</span> Node();</span><br><span class="line">    <span class="comment">// 标识节点当前在独占模式下</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> Node EXCLUSIVE = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// ======== 下面的几个int常量是给waitStatus用的 ===========</span></span><br><span class="line">    <span class="comment">/** waitStatus value to indicate thread has cancelled */</span></span><br><span class="line">    <span class="comment">// 代码此线程取消了争抢这个锁</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> CANCELLED =  <span class="number">1</span>;</span><br><span class="line">    <span class="comment">/** waitStatus value to indicate successor's thread needs unparking */</span></span><br><span class="line">    <span class="comment">// 官方的描述是，其表示当前node的后继节点对应的线程需要被唤醒</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> SIGNAL    = -<span class="number">1</span>;</span><br><span class="line">    <span class="comment">/** waitStatus value to indicate thread is waiting on condition */</span></span><br><span class="line">    <span class="comment">// 本文不分析condition，所以略过吧，下一篇文章会介绍这个</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> CONDITION = -<span class="number">2</span>;</span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * waitStatus value to indicate the next acquireShared should</span></span><br><span class="line"><span class="comment">     * unconditionally propagate</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="comment">// 同样的不分析，略过吧</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> PROPAGATE = -<span class="number">3</span>;</span><br><span class="line">    <span class="comment">// =====================================================</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">// 取值为上面的1、-1、-2、-3，或者0(以后会讲到)</span></span><br><span class="line">    <span class="comment">// 这么理解，暂时只需要知道如果这个值 大于0 代表此线程取消了等待，</span></span><br><span class="line">    <span class="comment">//    ps: 半天抢不到锁，不抢了，ReentrantLock是可以指定timeouot的。。。</span></span><br><span class="line">    <span class="keyword">volatile</span> <span class="keyword">int</span> waitStatus;</span><br><span class="line">    <span class="comment">// 前驱节点的引用</span></span><br><span class="line">    <span class="keyword">volatile</span> Node prev;</span><br><span class="line">    <span class="comment">// 后继节点的引用</span></span><br><span class="line">    <span class="keyword">volatile</span> Node next;</span><br><span class="line">    <span class="comment">// 这个就是线程本尊</span></span><br><span class="line">    <span class="keyword">volatile</span> Thread thread;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>其实可以主要关注这个 <code>waitStatus</code> 因为这个是后面的节点给前面的节点设置的，等于-1 的时候代表后面有节点等待，需要去唤醒，<br>这里使用了一个变种的 CLH 队列实现，CLH 队列相关内容可以查看这篇 <a href="https://coderbee.net/index.php/concurrent/20131115/577" target="_blank" rel="noopener">自旋锁、排队自旋锁、MCS锁、CLH锁</a></p>
+          <p>对 Java 的 gc 实现比较感兴趣，原先一般都是看周志明的书，但其实并没有讲具体的 gc 源码，而是把整个思路和流程讲解了一下<br>特别是 G1 的具体实现<br>一般对 G1 的理解其实就是把原先整块的新生代老年代分成了以 region 为单位的小块内存，简而言之，就是原先对新生代老年代的收集会涉及到整个代的堆内存空间，而G1 把它变成了更细致的小块内存<br>这带来了一个很明显的好处和一个很明显的坏处，好处是内存收集可以更灵活，耗时会变短，但整个收集的处理复杂度就变高了<br>目前看了一点点关于 G1 收集的预期时间相关的代码</p>
+<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">HeapWord* <span class="title">G1CollectedHeap::do_collection_pause</span><span class="params">(<span class="keyword">size_t</span> word_size,</span></span></span><br><span class="line"><span class="function"><span class="params">                                               uint gc_count_before,</span></span></span><br><span class="line"><span class="function"><span class="params">                                               <span class="keyword">bool</span>* succeeded,</span></span></span><br><span class="line"><span class="function"><span class="params">                                               GCCause::Cause gc_cause)</span> </span>&#123;</span><br><span class="line">  assert_heap_not_locked_and_not_at_safepoint();</span><br><span class="line">  <span class="function">VM_G1CollectForAllocation <span class="title">op</span><span class="params">(word_size,</span></span></span><br><span class="line"><span class="function"><span class="params">                               gc_count_before,</span></span></span><br><span class="line"><span class="function"><span class="params">                               gc_cause,</span></span></span><br><span class="line"><span class="function"><span class="params">                               <span class="literal">false</span>, <span class="comment">/* should_initiate_conc_mark */</span></span></span></span><br><span class="line"><span class="function"><span class="params">                               g1_policy()-&gt;max_pause_time_ms())</span></span>;</span><br><span class="line">  VMThread::execute(&amp;op);</span><br><span class="line"></span><br><span class="line">  HeapWord* result = op.result();</span><br><span class="line">  <span class="keyword">bool</span> ret_succeeded = op.prologue_succeeded() &amp;&amp; op.pause_succeeded();</span><br><span class="line">  assert(result == <span class="literal">NULL</span> || ret_succeeded,</span><br><span class="line">         <span class="string">"the result should be NULL if the VM did not succeed"</span>);</span><br><span class="line">  *succeeded = ret_succeeded;</span><br><span class="line"></span><br><span class="line">  assert_heap_not_locked();</span><br><span class="line">  <span class="keyword">return</span> result;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>这里就是收集时需要停顿的，其中<code>VMThread::execute(&amp;op);</code>是具体执行的，真正执行的是<code>VM_G1CollectForAllocation::doit</code>方法</p>
+<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">VM_G1CollectForAllocation::doit</span><span class="params">()</span> </span>&#123;</span><br><span class="line">  G1CollectedHeap* g1h = G1CollectedHeap::heap();</span><br><span class="line">  assert(!_should_initiate_conc_mark || g1h-&gt;should_do_concurrent_full_gc(_gc_cause),</span><br><span class="line">      <span class="string">"only a GC locker, a System.gc(), stats update, whitebox, or a hum allocation induced GC should start a cycle"</span>);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">if</span> (_word_size &gt; <span class="number">0</span>) &#123;</span><br><span class="line">    <span class="comment">// An allocation has been requested. So, try to do that first.</span></span><br><span class="line">    _result = g1h-&gt;attempt_allocation_at_safepoint(_word_size,</span><br><span class="line">                                                   <span class="literal">false</span> <span class="comment">/* expect_null_cur_alloc_region */</span>);</span><br><span class="line">    <span class="keyword">if</span> (_result != <span class="literal">NULL</span>) &#123;</span><br><span class="line">      <span class="comment">// If we can successfully allocate before we actually do the</span></span><br><span class="line">      <span class="comment">// pause then we will consider this pause successful.</span></span><br><span class="line">      _pause_succeeded = <span class="literal">true</span>;</span><br><span class="line">      <span class="keyword">return</span>;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="function">GCCauseSetter <span class="title">x</span><span class="params">(g1h, _gc_cause)</span></span>;</span><br><span class="line">  <span class="keyword">if</span> (_should_initiate_conc_mark) &#123;</span><br><span class="line">    <span class="comment">// It's safer to read old_marking_cycles_completed() here, given</span></span><br><span class="line">    <span class="comment">// that noone else will be updating it concurrently. Since we'll</span></span><br><span class="line">    <span class="comment">// only need it if we're initiating a marking cycle, no point in</span></span><br><span class="line">    <span class="comment">// setting it earlier.</span></span><br><span class="line">    _old_marking_cycles_completed_before = g1h-&gt;old_marking_cycles_completed();</span><br><span class="line"></span><br><span class="line">    <span class="comment">// At this point we are supposed to start a concurrent cycle. We</span></span><br><span class="line">    <span class="comment">// will do so if one is not already in progress.</span></span><br><span class="line">    <span class="keyword">bool</span> res = g1h-&gt;g1_policy()-&gt;force_initial_mark_if_outside_cycle(_gc_cause);</span><br><span class="line"></span><br><span class="line">    <span class="comment">// The above routine returns true if we were able to force the</span></span><br><span class="line">    <span class="comment">// next GC pause to be an initial mark; it returns false if a</span></span><br><span class="line">    <span class="comment">// marking cycle is already in progress.</span></span><br><span class="line">    <span class="comment">//</span></span><br><span class="line">    <span class="comment">// If a marking cycle is already in progress just return and skip the</span></span><br><span class="line">    <span class="comment">// pause below - if the reason for requesting this initial mark pause</span></span><br><span class="line">    <span class="comment">// was due to a System.gc() then the requesting thread should block in</span></span><br><span class="line">    <span class="comment">// doit_epilogue() until the marking cycle is complete.</span></span><br><span class="line">    <span class="comment">//</span></span><br><span class="line">    <span class="comment">// If this initial mark pause was requested as part of a humongous</span></span><br><span class="line">    <span class="comment">// allocation then we know that the marking cycle must just have</span></span><br><span class="line">    <span class="comment">// been started by another thread (possibly also allocating a humongous</span></span><br><span class="line">    <span class="comment">// object) as there was no active marking cycle when the requesting</span></span><br><span class="line">    <span class="comment">// thread checked before calling collect() in</span></span><br><span class="line">    <span class="comment">// attempt_allocation_humongous(). Retrying the GC, in this case,</span></span><br><span class="line">    <span class="comment">// will cause the requesting thread to spin inside collect() until the</span></span><br><span class="line">    <span class="comment">// just started marking cycle is complete - which may be a while. So</span></span><br><span class="line">    <span class="comment">// we do NOT retry the GC.</span></span><br><span class="line">    <span class="keyword">if</span> (!res) &#123;</span><br><span class="line">      assert(_word_size == <span class="number">0</span>, <span class="string">"Concurrent Full GC/Humongous Object IM shouldn't be allocating"</span>);</span><br><span class="line">      <span class="keyword">if</span> (_gc_cause != GCCause::_g1_humongous_allocation) &#123;</span><br><span class="line">        _should_retry_gc = <span class="literal">true</span>;</span><br><span class="line">      &#125;</span><br><span class="line">      <span class="keyword">return</span>;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="comment">// Try a partial collection of some kind.</span></span><br><span class="line">  _pause_succeeded = g1h-&gt;do_collection_pause_at_safepoint(_target_pause_time_ms);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">if</span> (_pause_succeeded) &#123;</span><br><span class="line">    <span class="keyword">if</span> (_word_size &gt; <span class="number">0</span>) &#123;</span><br><span class="line">      <span class="comment">// An allocation had been requested. Do it, eventually trying a stronger</span></span><br><span class="line">      <span class="comment">// kind of GC.</span></span><br><span class="line">      _result = g1h-&gt;satisfy_failed_allocation(_word_size, &amp;_pause_succeeded);</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">      <span class="keyword">bool</span> should_upgrade_to_full = !g1h-&gt;should_do_concurrent_full_gc(_gc_cause) &amp;&amp;</span><br><span class="line">                                    !g1h-&gt;has_regions_left_for_allocation();</span><br><span class="line">      <span class="keyword">if</span> (should_upgrade_to_full) &#123;</span><br><span class="line">        <span class="comment">// There has been a request to perform a GC to free some space. We have no</span></span><br><span class="line">        <span class="comment">// information on how much memory has been asked for. In case there are</span></span><br><span class="line">        <span class="comment">// absolutely no regions left to allocate into, do a maximally compacting full GC.</span></span><br><span class="line">        log_info(gc, ergo)(<span class="string">"Attempting maximally compacting collection"</span>);</span><br><span class="line">        _pause_succeeded = g1h-&gt;do_full_collection(<span class="literal">false</span>, <span class="comment">/* explicit gc */</span></span><br><span class="line">                                                   <span class="literal">true</span>   <span class="comment">/* clear_all_soft_refs */</span>);</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    guarantee(_pause_succeeded, <span class="string">"Elevated collections during the safepoint must always succeed."</span>);</span><br><span class="line">  &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">    assert(_result == <span class="literal">NULL</span>, <span class="string">"invariant"</span>);</span><br><span class="line">    <span class="comment">// The only reason for the pause to not be successful is that, the GC locker is</span></span><br><span class="line">    <span class="comment">// active (or has become active since the prologue was executed). In this case</span></span><br><span class="line">    <span class="comment">// we should retry the pause after waiting for the GC locker to become inactive.</span></span><br><span class="line">    _should_retry_gc = <span class="literal">true</span>;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>这里可以看到核心的是<code>G1CollectedHeap::do_collection_pause_at_safepoint</code>这个方法，它带上了目标暂停时间的值</p>
+<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span 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class="line">302</span><br><span class="line">303</span><br><span class="line">304</span><br><span class="line">305</span><br><span class="line">306</span><br><span class="line">307</span><br><span class="line">308</span><br><span class="line">309</span><br><span class="line">310</span><br><span class="line">311</span><br><span class="line">312</span><br><span class="line">313</span><br><span class="line">314</span><br><span class="line">315</span><br><span class="line">316</span><br><span class="line">317</span><br><span class="line">318</span><br><span class="line">319</span><br><span class="line">320</span><br><span class="line">321</span><br><span class="line">322</span><br><span class="line">323</span><br><span class="line">324</span><br><span class="line">325</span><br><span class="line">326</span><br><span class="line">327</span><br><span class="line">328</span><br><span class="line">329</span><br><span class="line">330</span><br></pre></td><td class="code"><pre><span class="line">G1CollectedHeap::do_collection_pause_at_safepoint(<span class="keyword">double</span> target_pause_time_ms) &#123;</span><br><span class="line">  assert_at_safepoint_on_vm_thread();</span><br><span class="line">  guarantee(!is_gc_active(), <span class="string">"collection is not reentrant"</span>);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">if</span> (GCLocker::check_active_before_gc()) &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  _gc_timer_stw-&gt;register_gc_start();</span><br><span class="line"></span><br><span class="line">  GCIdMark gc_id_mark;</span><br><span class="line">  _gc_tracer_stw-&gt;report_gc_start(gc_cause(), _gc_timer_stw-&gt;gc_start());</span><br><span class="line"></span><br><span class="line">  <span class="function">SvcGCMarker <span class="title">sgcm</span><span class="params">(SvcGCMarker::MINOR)</span></span>;</span><br><span class="line">  ResourceMark rm;</span><br><span class="line"></span><br><span class="line">  g1_policy()-&gt;note_gc_start();</span><br><span class="line"></span><br><span class="line">  wait_for_root_region_scanning();</span><br><span class="line"></span><br><span class="line">  print_heap_before_gc();</span><br><span class="line">  print_heap_regions();</span><br><span class="line">  trace_heap_before_gc(_gc_tracer_stw);</span><br><span class="line"></span><br><span class="line">  _verifier-&gt;verify_region_sets_optional();</span><br><span class="line">  _verifier-&gt;verify_dirty_young_regions();</span><br><span class="line"></span><br><span class="line">  <span class="comment">// We should not be doing initial mark unless the conc mark thread is running</span></span><br><span class="line">  <span class="keyword">if</span> (!_cm_thread-&gt;should_terminate()) &#123;</span><br><span class="line">    <span class="comment">// This call will decide whether this pause is an initial-mark</span></span><br><span class="line">    <span class="comment">// pause. If it is, in_initial_mark_gc() will return true</span></span><br><span class="line">    <span class="comment">// for the duration of this pause.</span></span><br><span class="line">    g1_policy()-&gt;decide_on_conc_mark_initiation();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="comment">// We do not allow initial-mark to be piggy-backed on a mixed GC.</span></span><br><span class="line">  assert(!collector_state()-&gt;in_initial_mark_gc() ||</span><br><span class="line">          collector_state()-&gt;in_young_only_phase(), <span class="string">"sanity"</span>);</span><br><span class="line"></span><br><span class="line">  <span class="comment">// We also do not allow mixed GCs during marking.</span></span><br><span class="line">  assert(!collector_state()-&gt;mark_or_rebuild_in_progress() || collector_state()-&gt;in_young_only_phase(), <span class="string">"sanity"</span>);</span><br><span class="line"></span><br><span class="line">  <span class="comment">// Record whether this pause is an initial mark. When the current</span></span><br><span class="line">  <span class="comment">// thread has completed its logging output and it's safe to signal</span></span><br><span class="line">  <span class="comment">// the CM thread, the flag's value in the policy has been reset.</span></span><br><span class="line">  <span class="keyword">bool</span> should_start_conc_mark = collector_state()-&gt;in_initial_mark_gc();</span><br><span class="line"></span><br><span class="line">  <span class="comment">// Inner scope for scope based logging, timers, and stats collection</span></span><br><span class="line">  &#123;</span><br><span class="line">    EvacuationInfo evacuation_info;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (collector_state()-&gt;in_initial_mark_gc()) &#123;</span><br><span class="line">      <span class="comment">// We are about to start a marking cycle, so we increment the</span></span><br><span class="line">      <span class="comment">// full collection counter.</span></span><br><span class="line">      increment_old_marking_cycles_started();</span><br><span class="line">      _cm-&gt;gc_tracer_cm()-&gt;set_gc_cause(gc_cause());</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    _gc_tracer_stw-&gt;report_yc_type(collector_state()-&gt;yc_type());</span><br><span class="line"></span><br><span class="line">    GCTraceCPUTime tcpu;</span><br><span class="line"></span><br><span class="line">    G1HeapVerifier::G1VerifyType verify_type;</span><br><span class="line">    <span class="function">FormatBuffer&lt;&gt; <span class="title">gc_string</span><span class="params">(<span class="string">"Pause Young "</span>)</span></span>;</span><br><span class="line">    <span class="keyword">if</span> (collector_state()-&gt;in_initial_mark_gc()) &#123;</span><br><span class="line">      gc_string.append(<span class="string">"(Concurrent Start)"</span>);</span><br><span class="line">      verify_type = G1HeapVerifier::G1VerifyConcurrentStart;</span><br><span class="line">    &#125; <span class="keyword">else</span> <span class="keyword">if</span> (collector_state()-&gt;in_young_only_phase()) &#123;</span><br><span class="line">      <span class="keyword">if</span> (collector_state()-&gt;in_young_gc_before_mixed()) &#123;</span><br><span class="line">        gc_string.append(<span class="string">"(Prepare Mixed)"</span>);</span><br><span class="line">      &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        gc_string.append(<span class="string">"(Normal)"</span>);</span><br><span class="line">      &#125;</span><br><span class="line">      verify_type = G1HeapVerifier::G1VerifyYoungNormal;</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">      gc_string.append(<span class="string">"(Mixed)"</span>);</span><br><span class="line">      verify_type = G1HeapVerifier::G1VerifyMixed;</span><br><span class="line">    &#125;</span><br><span class="line">    GCTraceTime(Info, gc) tm(gc_string, <span class="literal">NULL</span>, gc_cause(), <span class="literal">true</span>);</span><br><span class="line"></span><br><span class="line">    uint active_workers = AdaptiveSizePolicy::calc_active_workers(workers()-&gt;total_workers(),</span><br><span class="line">                                                                  workers()-&gt;active_workers(),</span><br><span class="line">                                                                  Threads::number_of_non_daemon_threads());</span><br><span class="line">    active_workers = workers()-&gt;update_active_workers(active_workers);</span><br><span class="line">    log_info(gc,task)(<span class="string">"Using %u workers of %u for evacuation"</span>, active_workers, workers()-&gt;total_workers());</span><br><span class="line"></span><br><span class="line">    <span class="function">TraceCollectorStats <span class="title">tcs</span><span class="params">(g1mm()-&gt;incremental_collection_counters())</span></span>;</span><br><span class="line">    <span class="function">TraceMemoryManagerStats <span class="title">tms</span><span class="params">(&amp;_memory_manager, gc_cause(),</span></span></span><br><span class="line"><span class="function"><span class="params">                                collector_state()-&gt;yc_type() == Mixed <span class="comment">/* allMemoryPoolsAffected */</span>)</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="function">G1HeapTransition <span class="title">heap_transition</span><span class="params">(<span class="keyword">this</span>)</span></span>;</span><br><span class="line">    <span class="keyword">size_t</span> heap_used_bytes_before_gc = used();</span><br><span class="line"></span><br><span class="line">    <span class="comment">// Don't dynamically change the number of GC threads this early.  A value of</span></span><br><span class="line">    <span class="comment">// 0 is used to indicate serial work.  When parallel work is done,</span></span><br><span class="line">    <span class="comment">// it will be set.</span></span><br><span class="line"></span><br><span class="line">    &#123; <span class="comment">// Call to jvmpi::post_class_unload_events must occur outside of active GC</span></span><br><span class="line">      IsGCActiveMark x;</span><br><span class="line"></span><br><span class="line">      gc_prologue(<span class="literal">false</span>);</span><br><span class="line"></span><br><span class="line">      <span class="keyword">if</span> (VerifyRememberedSets) &#123;</span><br><span class="line">        log_info(gc, verify)(<span class="string">"[Verifying RemSets before GC]"</span>);</span><br><span class="line">        VerifyRegionRemSetClosure v_cl;</span><br><span class="line">        heap_region_iterate(&amp;v_cl);</span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">      _verifier-&gt;verify_before_gc(verify_type);</span><br><span class="line"></span><br><span class="line">      _verifier-&gt;check_bitmaps(<span class="string">"GC Start"</span>);</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">if</span> COMPILER2_OR_JVMCI</span></span><br><span class="line">      DerivedPointerTable::<span class="built_in">clear</span>();</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"></span><br><span class="line">      <span class="comment">// Please see comment in g1CollectedHeap.hpp and</span></span><br><span class="line">      <span class="comment">// G1CollectedHeap::ref_processing_init() to see how</span></span><br><span class="line">      <span class="comment">// reference processing currently works in G1.</span></span><br><span class="line"></span><br><span class="line">      <span class="comment">// Enable discovery in the STW reference processor</span></span><br><span class="line">      _ref_processor_stw-&gt;enable_discovery();</span><br><span class="line"></span><br><span class="line">      &#123;</span><br><span class="line">        <span class="comment">// We want to temporarily turn off discovery by the</span></span><br><span class="line">        <span class="comment">// CM ref processor, if necessary, and turn it back on</span></span><br><span class="line">        <span class="comment">// on again later if we do. Using a scoped</span></span><br><span class="line">        <span class="comment">// NoRefDiscovery object will do this.</span></span><br><span class="line">        <span class="function">NoRefDiscovery <span class="title">no_cm_discovery</span><span class="params">(_ref_processor_cm)</span></span>;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// Forget the current alloc region (we might even choose it to be part</span></span><br><span class="line">        <span class="comment">// of the collection set!).</span></span><br><span class="line">        _allocator-&gt;release_mutator_alloc_region();</span><br><span class="line"></span><br><span class="line">        <span class="comment">// This timing is only used by the ergonomics to handle our pause target.</span></span><br><span class="line">        <span class="comment">// It is unclear why this should not include the full pause. We will</span></span><br><span class="line">        <span class="comment">// investigate this in CR 7178365.</span></span><br><span class="line">        <span class="comment">//</span></span><br><span class="line">        <span class="comment">// Preserving the old comment here if that helps the investigation:</span></span><br><span class="line">        <span class="comment">//</span></span><br><span class="line">        <span class="comment">// The elapsed time induced by the start time below deliberately elides</span></span><br><span class="line">        <span class="comment">// the possible verification above.</span></span><br><span class="line">        <span class="keyword">double</span> sample_start_time_sec = os::elapsedTime();</span><br><span class="line"></span><br><span class="line">        g1_policy()-&gt;record_collection_pause_start(sample_start_time_sec);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (collector_state()-&gt;in_initial_mark_gc()) &#123;</span><br><span class="line">          concurrent_mark()-&gt;pre_initial_mark();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        g1_policy()-&gt;finalize_collection_set(target_pause_time_ms, &amp;_survivor);</span><br><span class="line"></span><br><span class="line">        evacuation_info.set_collectionset_regions(collection_set()-&gt;region_length());</span><br><span class="line"></span><br><span class="line">        <span class="comment">// Make sure the remembered sets are up to date. This needs to be</span></span><br><span class="line">        <span class="comment">// done before register_humongous_regions_with_cset(), because the</span></span><br><span class="line">        <span class="comment">// remembered sets are used there to choose eager reclaim candidates.</span></span><br><span class="line">        <span class="comment">// If the remembered sets are not up to date we might miss some</span></span><br><span class="line">        <span class="comment">// entries that need to be handled.</span></span><br><span class="line">        g1_rem_set()-&gt;cleanupHRRS();</span><br><span class="line"></span><br><span class="line">        register_humongous_regions_with_cset();</span><br><span class="line"></span><br><span class="line">        assert(_verifier-&gt;check_cset_fast_test(), <span class="string">"Inconsistency in the InCSetState table."</span>);</span><br><span class="line"></span><br><span class="line">        <span class="comment">// We call this after finalize_cset() to</span></span><br><span class="line">        <span class="comment">// ensure that the CSet has been finalized.</span></span><br><span class="line">        _cm-&gt;verify_no_cset_oops();</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (_hr_printer.is_active()) &#123;</span><br><span class="line">          <span class="function">G1PrintCollectionSetClosure <span class="title">cl</span><span class="params">(&amp;_hr_printer)</span></span>;</span><br><span class="line">          _collection_set.iterate(&amp;cl);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// Initialize the GC alloc regions.</span></span><br><span class="line">        _allocator-&gt;init_gc_alloc_regions(evacuation_info);</span><br><span class="line"></span><br><span class="line">        <span class="function">G1ParScanThreadStateSet <span class="title">per_thread_states</span><span class="params">(<span class="keyword">this</span>, workers()-&gt;active_workers(), collection_set()-&gt;young_region_length())</span></span>;</span><br><span class="line">        pre_evacuate_collection_set();</span><br><span class="line"></span><br><span class="line">        <span class="comment">// Actually do the work...</span></span><br><span class="line">        evacuate_collection_set(&amp;per_thread_states);</span><br><span class="line"></span><br><span class="line">        post_evacuate_collection_set(evacuation_info, &amp;per_thread_states);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">const</span> <span class="keyword">size_t</span>* surviving_young_words = per_thread_states.surviving_young_words();</span><br><span class="line">        free_collection_set(&amp;_collection_set, evacuation_info, surviving_young_words);</span><br><span class="line"></span><br><span class="line">        eagerly_reclaim_humongous_regions();</span><br><span class="line"></span><br><span class="line">        record_obj_copy_mem_stats();</span><br><span class="line">        _survivor_evac_stats.adjust_desired_plab_sz();</span><br><span class="line">        _old_evac_stats.adjust_desired_plab_sz();</span><br><span class="line"></span><br><span class="line">        <span class="keyword">double</span> start = os::elapsedTime();</span><br><span class="line">        start_new_collection_set();</span><br><span class="line">        g1_policy()-&gt;phase_times()-&gt;record_start_new_cset_time_ms((os::elapsedTime() - start) * <span class="number">1000.0</span>);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (evacuation_failed()) &#123;</span><br><span class="line">          set_used(recalculate_used());</span><br><span class="line">          <span class="keyword">if</span> (_archive_allocator != <span class="literal">NULL</span>) &#123;</span><br><span class="line">            _archive_allocator-&gt;clear_used();</span><br><span class="line">          &#125;</span><br><span class="line">          <span class="keyword">for</span> (uint i = <span class="number">0</span>; i &lt; ParallelGCThreads; i++) &#123;</span><br><span class="line">            <span class="keyword">if</span> (_evacuation_failed_info_array[i].has_failed()) &#123;</span><br><span class="line">              _gc_tracer_stw-&gt;report_evacuation_failed(_evacuation_failed_info_array[i]);</span><br><span class="line">            &#125;</span><br><span class="line">          &#125;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">          <span class="comment">// The "used" of the the collection set have already been subtracted</span></span><br><span class="line">          <span class="comment">// when they were freed.  Add in the bytes evacuated.</span></span><br><span class="line">          increase_used(g1_policy()-&gt;bytes_copied_during_gc());</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (collector_state()-&gt;in_initial_mark_gc()) &#123;</span><br><span class="line">          <span class="comment">// We have to do this before we notify the CM threads that</span></span><br><span class="line">          <span class="comment">// they can start working to make sure that all the</span></span><br><span class="line">          <span class="comment">// appropriate initialization is done on the CM object.</span></span><br><span class="line">          concurrent_mark()-&gt;post_initial_mark();</span><br><span class="line">          <span class="comment">// Note that we don't actually trigger the CM thread at</span></span><br><span class="line">          <span class="comment">// this point. We do that later when we're sure that</span></span><br><span class="line">          <span class="comment">// the current thread has completed its logging output.</span></span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        allocate_dummy_regions();</span><br><span class="line"></span><br><span class="line">        _allocator-&gt;init_mutator_alloc_region();</span><br><span class="line"></span><br><span class="line">        &#123;</span><br><span class="line">          <span class="keyword">size_t</span> expand_bytes = _heap_sizing_policy-&gt;expansion_amount();</span><br><span class="line">          <span class="keyword">if</span> (expand_bytes &gt; <span class="number">0</span>) &#123;</span><br><span class="line">            <span class="keyword">size_t</span> bytes_before = capacity();</span><br><span class="line">            <span class="comment">// No need for an ergo logging here,</span></span><br><span class="line">            <span class="comment">// expansion_amount() does this when it returns a value &gt; 0.</span></span><br><span class="line">            <span class="keyword">double</span> expand_ms;</span><br><span class="line">            <span class="keyword">if</span> (!expand(expand_bytes, _workers, &amp;expand_ms)) &#123;</span><br><span class="line">              <span class="comment">// We failed to expand the heap. Cannot do anything about it.</span></span><br><span class="line">            &#125;</span><br><span class="line">            g1_policy()-&gt;phase_times()-&gt;record_expand_heap_time(expand_ms);</span><br><span class="line">          &#125;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// We redo the verification but now wrt to the new CSet which</span></span><br><span class="line">        <span class="comment">// has just got initialized after the previous CSet was freed.</span></span><br><span class="line">        _cm-&gt;verify_no_cset_oops();</span><br><span class="line"></span><br><span class="line">        <span class="comment">// This timing is only used by the ergonomics to handle our pause target.</span></span><br><span class="line">        <span class="comment">// It is unclear why this should not include the full pause. We will</span></span><br><span class="line">        <span class="comment">// investigate this in CR 7178365.</span></span><br><span class="line">        <span class="keyword">double</span> sample_end_time_sec = os::elapsedTime();</span><br><span class="line">        <span class="keyword">double</span> pause_time_ms = (sample_end_time_sec - sample_start_time_sec) * MILLIUNITS;</span><br><span class="line">        <span class="keyword">size_t</span> total_cards_scanned = g1_policy()-&gt;phase_times()-&gt;sum_thread_work_items(G1GCPhaseTimes::ScanRS, G1GCPhaseTimes::ScanRSScannedCards);</span><br><span class="line">        g1_policy()-&gt;record_collection_pause_end(pause_time_ms, total_cards_scanned, heap_used_bytes_before_gc);</span><br><span class="line"></span><br><span class="line">        evacuation_info.set_collectionset_used_before(collection_set()-&gt;bytes_used_before());</span><br><span class="line">        evacuation_info.set_bytes_copied(g1_policy()-&gt;bytes_copied_during_gc());</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (VerifyRememberedSets) &#123;</span><br><span class="line">          log_info(gc, verify)(<span class="string">"[Verifying RemSets after GC]"</span>);</span><br><span class="line">          VerifyRegionRemSetClosure v_cl;</span><br><span class="line">          heap_region_iterate(&amp;v_cl);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        _verifier-&gt;verify_after_gc(verify_type);</span><br><span class="line">        _verifier-&gt;check_bitmaps(<span class="string">"GC End"</span>);</span><br><span class="line"></span><br><span class="line">        assert(!_ref_processor_stw-&gt;discovery_enabled(), <span class="string">"Postcondition"</span>);</span><br><span class="line">        _ref_processor_stw-&gt;verify_no_references_recorded();</span><br><span class="line"></span><br><span class="line">        <span class="comment">// CM reference discovery will be re-enabled if necessary.</span></span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> TRACESPINNING</span></span><br><span class="line">      ParallelTaskTerminator::print_termination_counts();</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"></span><br><span class="line">      gc_epilogue(<span class="literal">false</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// Print the remainder of the GC log output.</span></span><br><span class="line">    <span class="keyword">if</span> (evacuation_failed()) &#123;</span><br><span class="line">      log_info(gc)(<span class="string">"To-space exhausted"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    g1_policy()-&gt;print_phases();</span><br><span class="line">    heap_transition.<span class="built_in">print</span>();</span><br><span class="line"></span><br><span class="line">    <span class="comment">// It is not yet to safe to tell the concurrent mark to</span></span><br><span class="line">    <span class="comment">// start as we have some optional output below. We don't want the</span></span><br><span class="line">    <span class="comment">// output from the concurrent mark thread interfering with this</span></span><br><span class="line">    <span class="comment">// logging output either.</span></span><br><span class="line"></span><br><span class="line">    _hrm.verify_optional();</span><br><span class="line">    _verifier-&gt;verify_region_sets_optional();</span><br><span class="line"></span><br><span class="line">    TASKQUEUE_STATS_ONLY(print_taskqueue_stats());</span><br><span class="line">    TASKQUEUE_STATS_ONLY(reset_taskqueue_stats());</span><br><span class="line"></span><br><span class="line">    print_heap_after_gc();</span><br><span class="line">    print_heap_regions();</span><br><span class="line">    trace_heap_after_gc(_gc_tracer_stw);</span><br><span class="line"></span><br><span class="line">    <span class="comment">// We must call G1MonitoringSupport::update_sizes() in the same scoping level</span></span><br><span class="line">    <span class="comment">// as an active TraceMemoryManagerStats object (i.e. before the destructor for the</span></span><br><span class="line">    <span class="comment">// TraceMemoryManagerStats is called) so that the G1 memory pools are updated</span></span><br><span class="line">    <span class="comment">// before any GC notifications are raised.</span></span><br><span class="line">    g1mm()-&gt;update_sizes();</span><br><span class="line"></span><br><span class="line">    _gc_tracer_stw-&gt;report_evacuation_info(&amp;evacuation_info);</span><br><span class="line">    _gc_tracer_stw-&gt;report_tenuring_threshold(_g1_policy-&gt;tenuring_threshold());</span><br><span class="line">    _gc_timer_stw-&gt;register_gc_end();</span><br><span class="line">    _gc_tracer_stw-&gt;report_gc_end(_gc_timer_stw-&gt;gc_end(), _gc_timer_stw-&gt;time_partitions());</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="comment">// It should now be safe to tell the concurrent mark thread to start</span></span><br><span class="line">  <span class="comment">// without its logging output interfering with the logging output</span></span><br><span class="line">  <span class="comment">// that came from the pause.</span></span><br><span class="line"></span><br><span class="line">  <span class="keyword">if</span> (should_start_conc_mark) &#123;</span><br><span class="line">    <span class="comment">// CAUTION: after the doConcurrentMark() call below,</span></span><br><span class="line">    <span class="comment">// the concurrent marking thread(s) could be running</span></span><br><span class="line">    <span class="comment">// concurrently with us. Make sure that anything after</span></span><br><span class="line">    <span class="comment">// this point does not assume that we are the only GC thread</span></span><br><span class="line">    <span class="comment">// running. Note: of course, the actual marking work will</span></span><br><span class="line">    <span class="comment">// not start until the safepoint itself is released in</span></span><br><span class="line">    <span class="comment">// SuspendibleThreadSet::desynchronize().</span></span><br><span class="line">    do_concurrent_mark();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>往下走就是这一步<code>G1Policy::finalize_collection_set</code>,去处理新生代和老年代</p>
+<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">G1Policy::finalize_collection_set</span><span class="params">(<span class="keyword">double</span> target_pause_time_ms, G1SurvivorRegions* survivor)</span> </span>&#123;</span><br><span class="line">  <span class="keyword">double</span> time_remaining_ms = _collection_set-&gt;finalize_young_part(target_pause_time_ms, survivor);</span><br><span class="line">  _collection_set-&gt;finalize_old_part(time_remaining_ms);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>这里分别调用了两个方法，可以看到剩余时间是往下传的，来看一下具体的方法</p>
+<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">double</span> <span class="title">G1CollectionSet::finalize_young_part</span><span class="params">(<span class="keyword">double</span> target_pause_time_ms, G1SurvivorRegions* survivors)</span> </span>&#123;</span><br><span class="line">  <span class="keyword">double</span> young_start_time_sec = os::elapsedTime();</span><br><span class="line"></span><br><span class="line">  finalize_incremental_building();</span><br><span class="line"></span><br><span class="line">  guarantee(target_pause_time_ms &gt; <span class="number">0.0</span>,</span><br><span class="line">            <span class="string">"target_pause_time_ms = %1.6lf should be positive"</span>, target_pause_time_ms);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">size_t</span> pending_cards = _policy-&gt;pending_cards();</span><br><span class="line">  <span class="keyword">double</span> base_time_ms = _policy-&gt;predict_base_elapsed_time_ms(pending_cards);</span><br><span class="line">  <span class="keyword">double</span> time_remaining_ms = MAX2(target_pause_time_ms - base_time_ms, <span class="number">0.0</span>);</span><br><span class="line"></span><br><span class="line">  log_trace(gc, ergo, cset)(<span class="string">"Start choosing CSet. pending cards: "</span> SIZE_FORMAT <span class="string">" predicted base time: %1.2fms remaining time: %1.2fms target pause time: %1.2fms"</span>,</span><br><span class="line">                            pending_cards, base_time_ms, time_remaining_ms, target_pause_time_ms);</span><br><span class="line"></span><br><span class="line">  <span class="comment">// The young list is laid with the survivor regions from the previous</span></span><br><span class="line">  <span class="comment">// pause are appended to the RHS of the young list, i.e.</span></span><br><span class="line">  <span class="comment">//   [Newly Young Regions ++ Survivors from last pause].</span></span><br><span class="line"></span><br><span class="line">  uint survivor_region_length = survivors-&gt;length();</span><br><span class="line">  uint eden_region_length = _g1h-&gt;eden_regions_count();</span><br><span class="line">  init_region_lengths(eden_region_length, survivor_region_length);</span><br><span class="line"></span><br><span class="line">  verify_young_cset_indices();</span><br><span class="line"></span><br><span class="line">  <span class="comment">// Clear the fields that point to the survivor list - they are all young now.</span></span><br><span class="line">  survivors-&gt;convert_to_eden();</span><br><span class="line"></span><br><span class="line">  _bytes_used_before = _inc_bytes_used_before;</span><br><span class="line">  time_remaining_ms = MAX2(time_remaining_ms - _inc_predicted_elapsed_time_ms, <span class="number">0.0</span>);</span><br><span class="line"></span><br><span class="line">  log_trace(gc, ergo, cset)(<span class="string">"Add young regions to CSet. eden: %u regions, survivors: %u regions, predicted young region time: %1.2fms, target pause time: %1.2fms"</span>,</span><br><span class="line">                            eden_region_length, survivor_region_length, _inc_predicted_elapsed_time_ms, target_pause_time_ms);</span><br><span class="line"></span><br><span class="line">  <span class="comment">// The number of recorded young regions is the incremental</span></span><br><span class="line">  <span class="comment">// collection set's current size</span></span><br><span class="line">  set_recorded_rs_lengths(_inc_recorded_rs_lengths);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">double</span> young_end_time_sec = os::elapsedTime();</span><br><span class="line">  phase_times()-&gt;record_young_cset_choice_time_ms((young_end_time_sec - young_start_time_sec) * <span class="number">1000.0</span>);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">return</span> time_remaining_ms;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>下面是老年代的部分</p>
+<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">G1CollectionSet::finalize_old_part</span><span class="params">(<span class="keyword">double</span> time_remaining_ms)</span> </span>&#123;</span><br><span class="line">  <span class="keyword">double</span> non_young_start_time_sec = os::elapsedTime();</span><br><span class="line">  <span class="keyword">double</span> predicted_old_time_ms = <span class="number">0.0</span>;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">if</span> (collector_state()-&gt;in_mixed_phase()) &#123;</span><br><span class="line">    cset_chooser()-&gt;verify();</span><br><span class="line">    <span class="keyword">const</span> uint min_old_cset_length = _policy-&gt;calc_min_old_cset_length();</span><br><span class="line">    <span class="keyword">const</span> uint max_old_cset_length = _policy-&gt;calc_max_old_cset_length();</span><br><span class="line"></span><br><span class="line">    uint expensive_region_num = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">bool</span> check_time_remaining = _policy-&gt;adaptive_young_list_length();</span><br><span class="line"></span><br><span class="line">    HeapRegion* hr = cset_chooser()-&gt;<span class="built_in">peek</span>();</span><br><span class="line">    <span class="keyword">while</span> (hr != <span class="literal">NULL</span>) &#123;</span><br><span class="line">      <span class="keyword">if</span> (old_region_length() &gt;= max_old_cset_length) &#123;</span><br><span class="line">        <span class="comment">// Added maximum number of old regions to the CSet.</span></span><br><span class="line">        log_debug(gc, ergo, cset)(<span class="string">"Finish adding old regions to CSet (old CSet region num reached max). old %u regions, max %u regions"</span>,</span><br><span class="line">                                  old_region_length(), max_old_cset_length);</span><br><span class="line">        <span class="keyword">break</span>;</span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">      <span class="comment">// Stop adding regions if the remaining reclaimable space is</span></span><br><span class="line">      <span class="comment">// not above G1HeapWastePercent.</span></span><br><span class="line">      <span class="keyword">size_t</span> reclaimable_bytes = cset_chooser()-&gt;remaining_reclaimable_bytes();</span><br><span class="line">      <span class="keyword">double</span> reclaimable_percent = _policy-&gt;reclaimable_bytes_percent(reclaimable_bytes);</span><br><span class="line">      <span class="keyword">double</span> threshold = (<span class="keyword">double</span>) G1HeapWastePercent;</span><br><span class="line">      <span class="keyword">if</span> (reclaimable_percent &lt;= threshold) &#123;</span><br><span class="line">        <span class="comment">// We've added enough old regions that the amount of uncollected</span></span><br><span class="line">        <span class="comment">// reclaimable space is at or below the waste threshold. Stop</span></span><br><span class="line">        <span class="comment">// adding old regions to the CSet.</span></span><br><span class="line">        log_debug(gc, ergo, cset)(<span class="string">"Finish adding old regions to CSet (reclaimable percentage not over threshold). "</span></span><br><span class="line">                                  <span class="string">"old %u regions, max %u regions, reclaimable: "</span> SIZE_FORMAT <span class="string">"B (%1.2f%%) threshold: "</span> UINTX_FORMAT <span class="string">"%%"</span>,</span><br><span class="line">                                  old_region_length(), max_old_cset_length, reclaimable_bytes, reclaimable_percent, G1HeapWastePercent);</span><br><span class="line">        <span class="keyword">break</span>;</span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">      <span class="keyword">double</span> predicted_time_ms = predict_region_elapsed_time_ms(hr);</span><br><span class="line">      <span class="keyword">if</span> (check_time_remaining) &#123;</span><br><span class="line">        <span class="keyword">if</span> (predicted_time_ms &gt; time_remaining_ms) &#123;</span><br><span class="line">          <span class="comment">// Too expensive for the current CSet.</span></span><br><span class="line"></span><br><span class="line">          <span class="keyword">if</span> (old_region_length() &gt;= min_old_cset_length) &#123;</span><br><span class="line">            <span class="comment">// We have added the minimum number of old regions to the CSet,</span></span><br><span class="line">            <span class="comment">// we are done with this CSet.</span></span><br><span class="line">            log_debug(gc, ergo, cset)(<span class="string">"Finish adding old regions to CSet (predicted time is too high). "</span></span><br><span class="line">                                      <span class="string">"predicted time: %1.2fms, remaining time: %1.2fms old %u regions, min %u regions"</span>,</span><br><span class="line">                                      predicted_time_ms, time_remaining_ms, old_region_length(), min_old_cset_length);</span><br><span class="line">            <span class="keyword">break</span>;</span><br><span class="line">          &#125;</span><br><span class="line"></span><br><span class="line">          <span class="comment">// We'll add it anyway given that we haven't reached the</span></span><br><span class="line">          <span class="comment">// minimum number of old regions.</span></span><br><span class="line">          expensive_region_num += <span class="number">1</span>;</span><br><span class="line">        &#125;</span><br><span class="line">      &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="keyword">if</span> (old_region_length() &gt;= min_old_cset_length) &#123;</span><br><span class="line">          <span class="comment">// In the non-auto-tuning case, we'll finish adding regions</span></span><br><span class="line">          <span class="comment">// to the CSet if we reach the minimum.</span></span><br><span class="line"></span><br><span class="line">          log_debug(gc, ergo, cset)(<span class="string">"Finish adding old regions to CSet (old CSet region num reached min). old %u regions, min %u regions"</span>,</span><br><span class="line">                                    old_region_length(), min_old_cset_length);</span><br><span class="line">          <span class="keyword">break</span>;</span><br><span class="line">        &#125;</span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">      <span class="comment">// We will add this region to the CSet.</span></span><br><span class="line">      time_remaining_ms = MAX2(time_remaining_ms - predicted_time_ms, <span class="number">0.0</span>);</span><br><span class="line">      predicted_old_time_ms += predicted_time_ms;</span><br><span class="line">      cset_chooser()-&gt;pop(); <span class="comment">// already have region via peek()</span></span><br><span class="line">      _g1h-&gt;old_set_remove(hr);</span><br><span class="line">      add_old_region(hr);</span><br><span class="line"></span><br><span class="line">      hr = cset_chooser()-&gt;<span class="built_in">peek</span>();</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (hr == <span class="literal">NULL</span>) &#123;</span><br><span class="line">      log_debug(gc, ergo, cset)(<span class="string">"Finish adding old regions to CSet (candidate old regions not available)"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (expensive_region_num &gt; <span class="number">0</span>) &#123;</span><br><span class="line">      <span class="comment">// We print the information once here at the end, predicated on</span></span><br><span class="line">      <span class="comment">// whether we added any apparently expensive regions or not, to</span></span><br><span class="line">      <span class="comment">// avoid generating output per region.</span></span><br><span class="line">      log_debug(gc, ergo, cset)(<span class="string">"Added expensive regions to CSet (old CSet region num not reached min)."</span></span><br><span class="line">                                <span class="string">"old: %u regions, expensive: %u regions, min: %u regions, remaining time: %1.2fms"</span>,</span><br><span class="line">                                old_region_length(), expensive_region_num, min_old_cset_length, time_remaining_ms);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    cset_chooser()-&gt;verify();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  stop_incremental_building();</span><br><span class="line"></span><br><span class="line">  log_debug(gc, ergo, cset)(<span class="string">"Finish choosing CSet. old: %u regions, predicted old region time: %1.2fms, time remaining: %1.2f"</span>,</span><br><span class="line">                            old_region_length(), predicted_old_time_ms, time_remaining_ms);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">double</span> non_young_end_time_sec = os::elapsedTime();</span><br><span class="line">  phase_times()-&gt;record_non_young_cset_choice_time_ms((non_young_end_time_sec - non_young_start_time_sec) * <span class="number">1000.0</span>);</span><br><span class="line"></span><br><span class="line">  QuickSort::sort(_collection_set_regions, _collection_set_cur_length, compare_region_idx, <span class="literal">true</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>上面第三行是个判断，当前是否是 mixed 回收阶段，如果不是的话其实是没有老年代什么事的，所以可以看到代码基本是从这个 if 判断<br><code>if (collector_state()-&gt;in_mixed_phase()) {</code>开始往下走的<br>先写到这，偏向于做笔记用，有错轻拍</p>
 
       
     </div>
@@ -663,7 +676,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/06/18/openresty/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/09/23/AbstractQueuedSynchronizer/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -677,7 +690,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2019/06/18/openresty/" class="post-title-link" itemprop="url">openresty</a>
+            <a href="/2019/09/23/AbstractQueuedSynchronizer/" class="post-title-link" itemprop="url">AbstractQueuedSynchronizer</a>
         </h2>
 
         <div class="post-meta">
@@ -687,14 +700,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2019-06-18 19:03:05" itemprop="dateCreated datePublished" datetime="2019-06-18T19:03:05+08:00">2019-06-18</time>
+              <time title="Created: 2019-09-23 23:40:05" itemprop="dateCreated datePublished" datetime="2019-09-23T23:40:05+08:00">2019-09-23</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
+                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
               </span>
             <span class="post-meta-item">
               <span class="post-meta-item-icon">
@@ -702,12 +715,12 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/nginx/" itemprop="url" rel="index"><span itemprop="name">nginx</span></a>
+                  <a href="/categories/java/" itemprop="url" rel="index"><span itemprop="name">java</span></a>
                 </span>
             </span>
 
           
-            <span id="/2019/06/18/openresty/" class="post-meta-item leancloud_visitors" data-flag-title="openresty" title="Views">
+            <span id="/2019/09/23/AbstractQueuedSynchronizer/" class="post-meta-item leancloud_visitors" data-flag-title="AbstractQueuedSynchronizer" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -722,8 +735,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2019/06/18/openresty/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/06/18/openresty/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2019/09/23/AbstractQueuedSynchronizer/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/09/23/AbstractQueuedSynchronizer/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -738,38 +751,11 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <p>目前公司要对一些新的产品功能做灰度测试，因为在后端业务代码层面添加判断比较麻烦，所以想在nginx上做点手脚，就想到了openresty<br>前后也踩了不少坑，这边先写一点</p>
-<p>首先是日志<br><code>error_log logs/error.log debug;</code><br>需要nginx开启日志的debug才能看到日志</p>
-<p>使用 <code>lua_code_cache off</code>即可, 另外注意只有使用 <code>content_by_lua_file</code> 才会生效</p>
-<figure class="highlight lua"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">http &#123;</span><br><span class="line">  lua_code_cache off;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">location ~* /(\d+-.*)/api/orgunits/load_all(.*) &#123;</span><br><span class="line">   default_type <span class="string">'application/json;charset=utf-8'</span>;</span><br><span class="line">   content_by_lua_file /data/projects/xxx/current/lua/controller/load_data.lua;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-
-<p>使用lua给nginx请求response头添加内容可以用这个</p>
-<figure class="highlight lua"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ngx.header[<span class="string">'response'</span>] = <span class="string">'header'</span></span><br></pre></td></tr></table></figure>
-
-
-<p><a href="http://cyukang.com/2017/05/22/try-on-openresty.html" target="_blank" rel="noopener">使用总结</a></p>
-<p>后续：</p>
-<ol>
-<li>一开始在本地环境的时候使用content_by_lua_file只关注了头，后来发到测试环境发现请求内容都没代理转发到后端服务上<br>网上查了下发现content_by_lua_file是将请求的所有内容包括response都用这里面的lua脚本生成了，content这个词就表示是请求内容<br>后来改成了access_by_lua_file就正常了，只是要去获取请求内容和修改响应头，并不是要完整的接管请求</li>
-</ol>
-<ol start="2">
-<li><p>后来又碰到了一个坑是nginx有个client_body_buffer_size的配置参数，nginx在32位和64位系统里有8K和16K两个默认值，当请求内容大于这两个值的时候，会把请求内容放到临时文件里，这个时候openresty里的ngx.req.get_post_args()就会报“failed to get post args: requesty body in temp file not supported”这个错误，将client_body_buffer_size这个参数配置调大一点就好了</p>
-</li>
-<li><p>还有就是lua的异常捕获，网上看一般是用pcall和xpcall来进行保护调用，因为问题主要出在cjson的decode，这里有两个解决方案，一个就是将cjson.decode使用pcall封装，</p>
- <figure class="highlight lua"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">local</span> decode = <span class="built_in">require</span>(<span class="string">"cjson"</span>).decode</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">json_decode</span><span class="params">( str )</span></span></span><br><span class="line">    <span class="keyword">local</span> ok, t = <span class="built_in">pcall</span>(decode, str)</span><br><span class="line">    <span class="keyword">if</span> <span class="keyword">not</span> ok <span class="keyword">then</span></span><br><span class="line">      <span class="keyword">return</span> <span class="literal">nil</span></span><br><span class="line">    <span class="keyword">end</span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> t</span><br><span class="line"><span class="keyword">end</span></span><br></pre></td></tr></table></figure>
-<p> 这个是使用了pcall，称为保护调用，会在内部错误后返回两个参数，第一个是false，第二个是错误信息<br> 还有一种是使用cjson.safe包</p>
- <figure class="highlight lua"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">local</span> json = <span class="built_in">require</span>(<span class="string">"cjson.safe"</span>)</span><br><span class="line"><span class="keyword">local</span> str = <span class="string">[[ &#123;"key:"value"&#125; ]]</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">local</span> t = json.decode(str)</span><br><span class="line"><span class="keyword">if</span> t <span class="keyword">then</span></span><br><span class="line">    ngx.say(<span class="string">" --&gt; "</span>, <span class="built_in">type</span>(t))</span><br><span class="line"><span class="keyword">end</span></span><br></pre></td></tr></table></figure>
-<p> cjson.safe包会在解析失败的时候返回nil</p>
-</li>
-<li><p>还有一个是redis链接时如果host使用的是域名的话会提示“failed to connect: no resolver defined to resolve “redis.xxxxxx.com””，这里需要使用nginx的resolver指令，<br><code>resolver 8.8.8.8 valid=3600s;</code></p>
-</li>
-<li><p>还有一点补充下<br>就是业务在使用redis的时候使用了db的特性，所以在lua访问redis的时候也需要执行db，这里lua的redis库也支持了这个特性，可以使用instance:select(config:get(‘db’))来切换db</p>
-</li>
-<li><p>性能优化tips<br><a href="https://juejin.im/entry/5b0e8fcef265da09210072a3#openresty" target="_blank" rel="noopener">建议是尽量少使用阶段钩子，例如content_by_lua_file，*_by_lua</a></p>
-</li>
-<li><p>发现一个不错的openresty站点<br><a href="http://orhub.org/" target="_blank" rel="noopener">地址</a></p>
-</li>
-</ol>
+          <p>最近看了大神的 AQS 的文章，之前总是断断续续地看一点，每次都知难而退，下次看又从头开始，昨天总算硬着头皮看完了第一部分<br>首先 AQS 只要有这些属性</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 头结点，你直接把它当做 当前持有锁的线程 可能是最好理解的</span></span><br><span class="line"><span class="keyword">private</span> <span class="keyword">transient</span> <span class="keyword">volatile</span> Node head;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 阻塞的尾节点，每个新的节点进来，都插入到最后，也就形成了一个链表</span></span><br><span class="line"><span class="keyword">private</span> <span class="keyword">transient</span> <span class="keyword">volatile</span> Node tail;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 这个是最重要的，代表当前锁的状态，0代表没有被占用，大于 0 代表有线程持有当前锁</span></span><br><span class="line"><span class="comment">// 这个值可以大于 1，是因为锁可以重入，每次重入都加上 1</span></span><br><span class="line"><span class="keyword">private</span> <span class="keyword">volatile</span> <span class="keyword">int</span> state;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 代表当前持有独占锁的线程，举个最重要的使用例子，因为锁可以重入</span></span><br><span class="line"><span class="comment">// reentrantLock.lock()可以嵌套调用多次，所以每次用这个来判断当前线程是否已经拥有了锁</span></span><br><span class="line"><span class="comment">// if (currentThread == getExclusiveOwnerThread()) &#123;state++&#125;</span></span><br><span class="line"><span class="keyword">private</span> <span class="keyword">transient</span> Thread exclusiveOwnerThread; <span class="comment">//继承自AbstractOwnableSynchronizer</span></span><br></pre></td></tr></table></figure>
+<p>大概了解了 aqs 底层的双向等待队列，<br>结构是这样的<br><img data-src="https://tva1.sinaimg.cn/large/006tNbRwly1g9mxu0ndt1j319o08w0t7.jpg" alt=""><br>每个 node 里面主要是的代码结构也比较简单</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">static</span> <span class="keyword">final</span> <span class="class"><span class="keyword">class</span> <span class="title">Node</span> </span>&#123;</span><br><span class="line">    <span class="comment">// 标识节点当前在共享模式下</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> Node SHARED = <span class="keyword">new</span> Node();</span><br><span class="line">    <span class="comment">// 标识节点当前在独占模式下</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> Node EXCLUSIVE = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// ======== 下面的几个int常量是给waitStatus用的 ===========</span></span><br><span class="line">    <span class="comment">/** waitStatus value to indicate thread has cancelled */</span></span><br><span class="line">    <span class="comment">// 代码此线程取消了争抢这个锁</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> CANCELLED =  <span class="number">1</span>;</span><br><span class="line">    <span class="comment">/** waitStatus value to indicate successor's thread needs unparking */</span></span><br><span class="line">    <span class="comment">// 官方的描述是，其表示当前node的后继节点对应的线程需要被唤醒</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> SIGNAL    = -<span class="number">1</span>;</span><br><span class="line">    <span class="comment">/** waitStatus value to indicate thread is waiting on condition */</span></span><br><span class="line">    <span class="comment">// 本文不分析condition，所以略过吧，下一篇文章会介绍这个</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> CONDITION = -<span class="number">2</span>;</span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * waitStatus value to indicate the next acquireShared should</span></span><br><span class="line"><span class="comment">     * unconditionally propagate</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="comment">// 同样的不分析，略过吧</span></span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> PROPAGATE = -<span class="number">3</span>;</span><br><span class="line">    <span class="comment">// =====================================================</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">// 取值为上面的1、-1、-2、-3，或者0(以后会讲到)</span></span><br><span class="line">    <span class="comment">// 这么理解，暂时只需要知道如果这个值 大于0 代表此线程取消了等待，</span></span><br><span class="line">    <span class="comment">//    ps: 半天抢不到锁，不抢了，ReentrantLock是可以指定timeouot的。。。</span></span><br><span class="line">    <span class="keyword">volatile</span> <span class="keyword">int</span> waitStatus;</span><br><span class="line">    <span class="comment">// 前驱节点的引用</span></span><br><span class="line">    <span class="keyword">volatile</span> Node prev;</span><br><span class="line">    <span class="comment">// 后继节点的引用</span></span><br><span class="line">    <span class="keyword">volatile</span> Node next;</span><br><span class="line">    <span class="comment">// 这个就是线程本尊</span></span><br><span class="line">    <span class="keyword">volatile</span> Thread thread;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>其实可以主要关注这个 <code>waitStatus</code> 因为这个是后面的节点给前面的节点设置的，等于-1 的时候代表后面有节点等待，需要去唤醒，<br>这里使用了一个变种的 CLH 队列实现，CLH 队列相关内容可以查看这篇 <a href="https://coderbee.net/index.php/concurrent/20131115/577" target="_blank" rel="noopener">自旋锁、排队自旋锁、MCS锁、CLH锁</a></p>
 
       
     </div>
@@ -858,7 +844,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -933,7 +919,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/page/13/index.html b/page/13/index.html
index f9d3d79104..40623f8968 100644
--- a/page/13/index.html
+++ b/page/13/index.html
@@ -204,7 +204,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2017/05/09/ambari-summary/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/06/18/openresty/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -218,7 +218,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2017/05/09/ambari-summary/" class="post-title-link" itemprop="url">ambari-summary</a>
+            <a href="/2019/06/18/openresty/" class="post-title-link" itemprop="url">openresty</a>
         </h2>
 
         <div class="post-meta">
@@ -228,7 +228,7 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2017-05-09 23:53:05" itemprop="dateCreated datePublished" datetime="2017-05-09T23:53:05+08:00">2017-05-09</time>
+              <time title="Created: 2019-06-18 19:03:05" itemprop="dateCreated datePublished" datetime="2019-06-18T19:03:05+08:00">2019-06-18</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
@@ -243,12 +243,12 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/data-analysis/" itemprop="url" rel="index"><span itemprop="name">data analysis</span></a>
+                  <a href="/categories/nginx/" itemprop="url" rel="index"><span itemprop="name">nginx</span></a>
                 </span>
             </span>
 
           
-            <span id="/2017/05/09/ambari-summary/" class="post-meta-item leancloud_visitors" data-flag-title="ambari-summary" title="Views">
+            <span id="/2019/06/18/openresty/" class="post-meta-item leancloud_visitors" data-flag-title="openresty" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -263,8 +263,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2017/05/09/ambari-summary/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2017/05/09/ambari-summary/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2019/06/18/openresty/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/06/18/openresty/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -279,15 +279,38 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h2 id="初识ambari"><a href="#初识ambari" class="headerlink" title="初识ambari"></a>初识ambari</h2><p><a href="http://ambari.apache.org/" target="_blank" rel="noopener">ambari</a>是一个大数据平台的管理工具，包含了<code>hadoop</code>, <code>yarn</code>, <code>hive</code>, <code>hbase</code>, <code>spark</code>等大数据的基础架构和工具，简化了数据平台的搭建，之前只是在同事搭建好平台后的一些使用，这次有机会从头开始用<code>ambari</code>来搭建一个测试的数据平台，过程中也踩到不少坑，简单记录下。</p>
-<h2 id="简单过程"><a href="#简单过程" class="headerlink" title="简单过程"></a>简单过程</h2><ul>
-<li>第一个坑<br>在刚开始是按照官网的指南，用maven构建，因为GFW的原因，导致反复失败等待，也就是这个<a href="https://cwiki.apache.org/confluence/display/AMBARI/Installation+Guide+for+Ambari+2.5.0" target="_blank" rel="noopener">guide</a>，因为对maven不熟悉导致有些按图索骥，浪费了很多时间，之后才知道可以直接加repo用yum安装，然而用yum安装马上就出现了第二个坑。</li>
-<li>第二个坑<br>因为在线的repo还是因为网络原因很慢很慢，用proxychains勉强把ambari-server本身安装好了，<a href="http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.5.0.3/ambari.repo" target="_blank" rel="noopener">ambari.repo</a>将这个放进<code>/etc/yum.repos.d/</code>路径下，然后<code>yum update &amp;&amp; yum install ambari-server</code>安装即可，如果有条件就用proxychains走下代理。</li>
-<li>第三步<br>安装好ambari-server后先执行<code>ambari-server setup</code>做一些初始化设置，其中包含了JDK路径的设置，数据库设置，设置好就OK了，然后执行<code>ambari-server start</code>启动服务，这里有个小插曲，因为<code>ambari-server</code>涉及到这么多服务，所以管理控制监控之类的模块是必不可少的，这部分可以在<code>ambari-server</code>的web ui界面安装，也可以命令行提前安装，这部分被称为<code>HDF Management Pack</code>，运行```ambari-server install-mpack \</li>
-<li>-mpack=<a href="http://public-repo-1.hortonworks.com/HDF/centos7/2.x/updates/2.1.4.0/tars/hdf_ambari_mp/hdf-ambari-mpack-2.1.4.0-5.tar.gz" target="_blank" rel="noopener">http://public-repo-1.hortonworks.com/HDF/centos7/2.x/updates/2.1.4.0/tars/hdf_ambari_mp/hdf-ambari-mpack-2.1.4.0-5.tar.gz</a> \</li>
-<li>-purge \</li>
-<li>-verbose```<br>安装，当然这个压缩包可以下载之后指到本地路径安装，然后就可以重启<code>ambari-server</code></li>
-</ul>
+          <p>目前公司要对一些新的产品功能做灰度测试，因为在后端业务代码层面添加判断比较麻烦，所以想在nginx上做点手脚，就想到了openresty<br>前后也踩了不少坑，这边先写一点</p>
+<p>首先是日志<br><code>error_log logs/error.log debug;</code><br>需要nginx开启日志的debug才能看到日志</p>
+<p>使用 <code>lua_code_cache off</code>即可, 另外注意只有使用 <code>content_by_lua_file</code> 才会生效</p>
+<figure class="highlight lua"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">http &#123;</span><br><span class="line">  lua_code_cache off;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">location ~* /(\d+-.*)/api/orgunits/load_all(.*) &#123;</span><br><span class="line">   default_type <span class="string">'application/json;charset=utf-8'</span>;</span><br><span class="line">   content_by_lua_file /data/projects/xxx/current/lua/controller/load_data.lua;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+
+<p>使用lua给nginx请求response头添加内容可以用这个</p>
+<figure class="highlight lua"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ngx.header[<span class="string">'response'</span>] = <span class="string">'header'</span></span><br></pre></td></tr></table></figure>
+
+
+<p><a href="http://cyukang.com/2017/05/22/try-on-openresty.html" target="_blank" rel="noopener">使用总结</a></p>
+<p>后续：</p>
+<ol>
+<li>一开始在本地环境的时候使用content_by_lua_file只关注了头，后来发到测试环境发现请求内容都没代理转发到后端服务上<br>网上查了下发现content_by_lua_file是将请求的所有内容包括response都用这里面的lua脚本生成了，content这个词就表示是请求内容<br>后来改成了access_by_lua_file就正常了，只是要去获取请求内容和修改响应头，并不是要完整的接管请求</li>
+</ol>
+<ol start="2">
+<li><p>后来又碰到了一个坑是nginx有个client_body_buffer_size的配置参数，nginx在32位和64位系统里有8K和16K两个默认值，当请求内容大于这两个值的时候，会把请求内容放到临时文件里，这个时候openresty里的ngx.req.get_post_args()就会报“failed to get post args: requesty body in temp file not supported”这个错误，将client_body_buffer_size这个参数配置调大一点就好了</p>
+</li>
+<li><p>还有就是lua的异常捕获，网上看一般是用pcall和xpcall来进行保护调用，因为问题主要出在cjson的decode，这里有两个解决方案，一个就是将cjson.decode使用pcall封装，</p>
+ <figure class="highlight lua"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">local</span> decode = <span class="built_in">require</span>(<span class="string">"cjson"</span>).decode</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">json_decode</span><span class="params">( str )</span></span></span><br><span class="line">    <span class="keyword">local</span> ok, t = <span class="built_in">pcall</span>(decode, str)</span><br><span class="line">    <span class="keyword">if</span> <span class="keyword">not</span> ok <span class="keyword">then</span></span><br><span class="line">      <span class="keyword">return</span> <span class="literal">nil</span></span><br><span class="line">    <span class="keyword">end</span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> t</span><br><span class="line"><span class="keyword">end</span></span><br></pre></td></tr></table></figure>
+<p> 这个是使用了pcall，称为保护调用，会在内部错误后返回两个参数，第一个是false，第二个是错误信息<br> 还有一种是使用cjson.safe包</p>
+ <figure class="highlight lua"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">local</span> json = <span class="built_in">require</span>(<span class="string">"cjson.safe"</span>)</span><br><span class="line"><span class="keyword">local</span> str = <span class="string">[[ &#123;"key:"value"&#125; ]]</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">local</span> t = json.decode(str)</span><br><span class="line"><span class="keyword">if</span> t <span class="keyword">then</span></span><br><span class="line">    ngx.say(<span class="string">" --&gt; "</span>, <span class="built_in">type</span>(t))</span><br><span class="line"><span class="keyword">end</span></span><br></pre></td></tr></table></figure>
+<p> cjson.safe包会在解析失败的时候返回nil</p>
+</li>
+<li><p>还有一个是redis链接时如果host使用的是域名的话会提示“failed to connect: no resolver defined to resolve “redis.xxxxxx.com””，这里需要使用nginx的resolver指令，<br><code>resolver 8.8.8.8 valid=3600s;</code></p>
+</li>
+<li><p>还有一点补充下<br>就是业务在使用redis的时候使用了db的特性，所以在lua访问redis的时候也需要执行db，这里lua的redis库也支持了这个特性，可以使用instance:select(config:get(‘db’))来切换db</p>
+</li>
+<li><p>性能优化tips<br><a href="https://juejin.im/entry/5b0e8fcef265da09210072a3#openresty" target="_blank" rel="noopener">建议是尽量少使用阶段钩子，例如content_by_lua_file，*_by_lua</a></p>
+</li>
+<li><p>发现一个不错的openresty站点<br><a href="http://orhub.org/" target="_blank" rel="noopener">地址</a></p>
+</li>
+</ol>
 
       
     </div>
@@ -309,7 +332,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2017/04/25/rabbitmq-tips/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2017/05/09/ambari-summary/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -323,7 +346,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2017/04/25/rabbitmq-tips/" class="post-title-link" itemprop="url">rabbitmq-tips</a>
+            <a href="/2017/05/09/ambari-summary/" class="post-title-link" itemprop="url">ambari-summary</a>
         </h2>
 
         <div class="post-meta">
@@ -333,14 +356,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2017-04-25 21:46:55" itemprop="dateCreated datePublished" datetime="2017-04-25T21:46:55+08:00">2017-04-25</time>
+              <time title="Created: 2017-05-09 23:53:05" itemprop="dateCreated datePublished" datetime="2017-05-09T23:53:05+08:00">2017-05-09</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
+                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
               </span>
             <span class="post-meta-item">
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@@ -348,12 +371,12 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/php/" itemprop="url" rel="index"><span itemprop="name">php</span></a>
+                  <a href="/categories/data-analysis/" itemprop="url" rel="index"><span itemprop="name">data analysis</span></a>
                 </span>
             </span>
 
           
-            <span id="/2017/04/25/rabbitmq-tips/" class="post-meta-item leancloud_visitors" data-flag-title="rabbitmq-tips" title="Views">
+            <span id="/2017/05/09/ambari-summary/" class="post-meta-item leancloud_visitors" data-flag-title="ambari-summary" title="Views">
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                 <i class="fa fa-eye"></i>
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@@ -368,8 +391,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2017/04/25/rabbitmq-tips/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2017/04/25/rabbitmq-tips/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2017/05/09/ambari-summary/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2017/05/09/ambari-summary/" itemprop="commentCount"></span>
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@@ -384,15 +407,15 @@
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-          <h2 id="rabbitmq-介绍"><a href="#rabbitmq-介绍" class="headerlink" title="rabbitmq 介绍"></a>rabbitmq 介绍</h2><p>接触了一下rabbitmq，原来在选型的时候是在rabbitmq跟kafka之间做选择，网上搜了一下之后发现kafka的优势在于吞吐量，而rabbitmq相对注重可靠性，因为应用在im上，需要保证消息不能丢失所以就暂时选定rabbitmq，<br>Message Queue的需求由来已久，80年代最早在金融交易中，高盛等公司采用Teknekron公司的产品，当时的Message queuing软件叫做：the information bus（TIB）。 TIB被电信和通讯公司采用，路透社收购了Teknekron公司。之后，IBM开发了MQSeries，微软开发了Microsoft Message Queue（MSMQ）。这些商业MQ供应商的问题是厂商锁定，价格高昂。2001年，Java Message queuing试图解决锁定和交互性的问题，但对应用来说反而更加麻烦了。<br>RabbitMQ采用Erlang语言开发。Erlang语言由Ericson设计，专门为开发concurrent和distribution系统的一种语言，在电信领域使用广泛。OTP（Open Telecom Platform）作为Erlang语言的一部分，包含了很多基于Erlang开发的中间件／库／工具，如mnesia／SASL，极大方便了Erlang应用的开发。OTP就类似于Python语言中众多的module，用户借助这些module可以很方便的开发应用。<br>于是2004年，摩根大通和iMatrix开始着手<a href="https://en.wikipedia.org/wiki/Advanced_Message_Queuing_Protocol" target="_blank" rel="noopener">Advanced Message Queuing Protocol （AMQP）</a>开放标准的开发。2006年，AMQP规范发布。2007年，Rabbit技术公司基于AMQP标准开发的RabbitMQ 1.0 发布。所有主要的编程语言均有与代理接口通讯的客户端库。</p>
-<h2 id="简单的使用经验"><a href="#简单的使用经验" class="headerlink" title="简单的使用经验"></a>简单的使用经验</h2><h3 id="通俗的理解"><a href="#通俗的理解" class="headerlink" title="通俗的理解"></a>通俗的理解</h3><p>这里介绍下其中的一些概念，connection表示和队列服务器的连接，一般情况下是tcp连接， channel表示通道，可以在一个连接上建立多个通道，这里主要是节省了tcp连接握手的成本，exchange可以理解成一个路由器，将消息推送给对应的队列queue，其实是像一个订阅的模式。</p>
-<h3 id="集群经验"><a href="#集群经验" class="headerlink" title="集群经验"></a>集群经验</h3><p><code>rabbitmqctl stop</code>这个是关闭rabbitmq，在搭建集群时候先关闭服务，然后使用<code>rabbitmq-server -detached</code>静默启动，这时候使用<code>rabbitmqctl cluster_status</code>查看集群状态，因为还没将节点加入集群，所以只能看到类似</p>
-<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Cluster status of node rabbit@rabbit1 ...</span><br><span class="line">[&#123;nodes,[&#123;disc,[rabbit@rabbit1,rabbit@rabbit2,rabbit@rabbit3]&#125;]&#125;,</span><br><span class="line"> &#123;running_nodes,[rabbit@rabbit2,rabbit@rabbit1]&#125;]</span><br><span class="line">...done.</span><br></pre></td></tr></table></figure>
-<p>然后就可以把当前节点加入集群，</p>
-<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">rabbit2$</span><span class="bash"> rabbitmqctl stop_app <span class="comment">#这个stop_app与stop的区别是前者停的是rabbitmq应用，保留erlang节点，</span></span></span><br><span class="line">                              #后者是停止了rabbitmq和erlang节点</span><br><span class="line">Stopping node rabbit@rabbit2 ...done.</span><br><span class="line"><span class="meta">rabbit2$</span><span class="bash"> rabbitmqctl join_cluster rabbit@rabbit1 <span class="comment">#这里可以用--ram指定将当前节点作为内存节点加入集群</span></span></span><br><span class="line">Clustering node rabbit@rabbit2 with [rabbit@rabbit1] ...done.</span><br><span class="line"><span class="meta">rabbit2$</span><span class="bash"> rabbitmqctl start_app</span></span><br><span class="line">Starting node rabbit@rabbit2 ...done.</span><br></pre></td></tr></table></figure>
-<p>其他可以参考<a href="http://www.rabbitmq.com/clustering.html" target="_blank" rel="noopener">官方文档</a></p>
-<h2 id="一些坑"><a href="#一些坑" class="headerlink" title="一些坑"></a>一些坑</h2><h3 id="消息丢失"><a href="#消息丢失" class="headerlink" title="消息丢失"></a>消息丢失</h3><p>这里碰到过一个坑，对于使用exchange来做消息路由的，会有一个情况，就是在routing_key没被订阅的时候，会将该条找不到路由对应的queue的消息丢掉<code>What happens if we break our contract and send a message with one or four words, like &quot;orange&quot; or &quot;quick.orange.male.rabbit&quot;? Well, these messages won&#39;t match any bindings and will be lost.</code><a href="http://www.rabbitmq.com/tutorials/tutorial-five-python.html" target="_blank" rel="noopener">对应链接</a>,而当使用空的exchange时，会保留消息，当出现消费者的时候就可以将收到之前生产者所推送的消息<a href="http://www.rabbitmq.com/tutorials/tutorial-two-python.html" target="_blank" rel="noopener">对应链接</a>,这里就是用了空的exchange。</p>
-<h3 id="集群搭建"><a href="#集群搭建" class="headerlink" title="集群搭建"></a>集群搭建</h3><p>集群搭建的时候有个erlang vm生成的random cookie，这个是用来做集群之间认证的，相同的cookie才能连接，但是如果通过vim打开复制后在其他几点新建文件写入会多一个换行，导致集群建立是报错，所以这里最好使用scp等传输命令直接传输cookie文件，同时要注意下cookie的文件权限。<br>另外在集群搭建的时候如果更改过hostname，那么要把rabbitmq的数据库删除，否则启动后会马上挂掉</p>
+          <h2 id="初识ambari"><a href="#初识ambari" class="headerlink" title="初识ambari"></a>初识ambari</h2><p><a href="http://ambari.apache.org/" target="_blank" rel="noopener">ambari</a>是一个大数据平台的管理工具，包含了<code>hadoop</code>, <code>yarn</code>, <code>hive</code>, <code>hbase</code>, <code>spark</code>等大数据的基础架构和工具，简化了数据平台的搭建，之前只是在同事搭建好平台后的一些使用，这次有机会从头开始用<code>ambari</code>来搭建一个测试的数据平台，过程中也踩到不少坑，简单记录下。</p>
+<h2 id="简单过程"><a href="#简单过程" class="headerlink" title="简单过程"></a>简单过程</h2><ul>
+<li>第一个坑<br>在刚开始是按照官网的指南，用maven构建，因为GFW的原因，导致反复失败等待，也就是这个<a href="https://cwiki.apache.org/confluence/display/AMBARI/Installation+Guide+for+Ambari+2.5.0" target="_blank" rel="noopener">guide</a>，因为对maven不熟悉导致有些按图索骥，浪费了很多时间，之后才知道可以直接加repo用yum安装，然而用yum安装马上就出现了第二个坑。</li>
+<li>第二个坑<br>因为在线的repo还是因为网络原因很慢很慢，用proxychains勉强把ambari-server本身安装好了，<a href="http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.5.0.3/ambari.repo" target="_blank" rel="noopener">ambari.repo</a>将这个放进<code>/etc/yum.repos.d/</code>路径下，然后<code>yum update &amp;&amp; yum install ambari-server</code>安装即可，如果有条件就用proxychains走下代理。</li>
+<li>第三步<br>安装好ambari-server后先执行<code>ambari-server setup</code>做一些初始化设置，其中包含了JDK路径的设置，数据库设置，设置好就OK了，然后执行<code>ambari-server start</code>启动服务，这里有个小插曲，因为<code>ambari-server</code>涉及到这么多服务，所以管理控制监控之类的模块是必不可少的，这部分可以在<code>ambari-server</code>的web ui界面安装，也可以命令行提前安装，这部分被称为<code>HDF Management Pack</code>，运行```ambari-server install-mpack \</li>
+<li>-mpack=<a href="http://public-repo-1.hortonworks.com/HDF/centos7/2.x/updates/2.1.4.0/tars/hdf_ambari_mp/hdf-ambari-mpack-2.1.4.0-5.tar.gz" target="_blank" rel="noopener">http://public-repo-1.hortonworks.com/HDF/centos7/2.x/updates/2.1.4.0/tars/hdf_ambari_mp/hdf-ambari-mpack-2.1.4.0-5.tar.gz</a> \</li>
+<li>-purge \</li>
+<li>-verbose```<br>安装，当然这个压缩包可以下载之后指到本地路径安装，然后就可以重启<code>ambari-server</code></li>
+</ul>
 
       
     </div>
@@ -414,7 +437,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2017/03/28/spark-little-tips/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2017/04/25/rabbitmq-tips/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -428,7 +451,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2017/03/28/spark-little-tips/" class="post-title-link" itemprop="url">spark-little-tips</a>
+            <a href="/2017/04/25/rabbitmq-tips/" class="post-title-link" itemprop="url">rabbitmq-tips</a>
         </h2>
 
         <div class="post-meta">
@@ -438,7 +461,7 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2017-03-28 19:20:56" itemprop="dateCreated datePublished" datetime="2017-03-28T19:20:56+08:00">2017-03-28</time>
+              <time title="Created: 2017-04-25 21:46:55" itemprop="dateCreated datePublished" datetime="2017-04-25T21:46:55+08:00">2017-04-25</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
@@ -453,12 +476,12 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/data-analysis/" itemprop="url" rel="index"><span itemprop="name">data analysis</span></a>
+                  <a href="/categories/php/" itemprop="url" rel="index"><span itemprop="name">php</span></a>
                 </span>
             </span>
 
           
-            <span id="/2017/03/28/spark-little-tips/" class="post-meta-item leancloud_visitors" data-flag-title="spark-little-tips" title="Views">
+            <span id="/2017/04/25/rabbitmq-tips/" class="post-meta-item leancloud_visitors" data-flag-title="rabbitmq-tips" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -473,8 +496,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2017/03/28/spark-little-tips/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2017/03/28/spark-little-tips/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2017/04/25/rabbitmq-tips/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2017/04/25/rabbitmq-tips/" itemprop="commentCount"></span>
     </a>
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@@ -489,11 +512,15 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h2 id="spark-的一些粗浅使用经验"><a href="#spark-的一些粗浅使用经验" class="headerlink" title="spark 的一些粗浅使用经验"></a>spark 的一些粗浅使用经验</h2><p>工作中学习使用了一下Spark做数据分析,主要是用spark的python接口，首先是<code>pyspark.SparkContext(appName=xxx)</code>，这是初始化一个Spark应用实例或者说会话，不能重复，<br>返回的实例句柄就可以调用<code>textFile(path)</code>读取文本文件，这里的文本文件可以是HDFS上的文本文件，也可以普通文本文件，但是需要在Spark的所有集群上都存在，否则会<br>读取失败，<code>parallelize</code>则可以将python生成的集合数据读取后转换成rdd(A Resilient Distributed Dataset (RDD),一种spark下的基本抽象数据集),基于这个RDD就可以做<br>数据的流式计算，例如<code>map reduce</code>,在Spark中可以非常方便地实现  </p>
-<h3 id="简单的mapreduce-word-count示例"><a href="#简单的mapreduce-word-count示例" class="headerlink" title="简单的mapreduce word count示例"></a>简单的mapreduce word count示例</h3><figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">textFile = sc.parallelize([(<span class="number">1</span>,<span class="number">1</span>), (<span class="number">2</span>,<span class="number">1</span>), (<span class="number">3</span>,<span class="number">1</span>), (<span class="number">4</span>,<span class="number">1</span>), (<span class="number">5</span>,<span class="number">1</span>),(<span class="number">1</span>,<span class="number">1</span>), (<span class="number">2</span>,<span class="number">1</span>), (<span class="number">3</span>,<span class="number">1</span>), (<span class="number">4</span>,<span class="number">1</span>), (<span class="number">5</span>,<span class="number">1</span>)])</span><br><span class="line">data = textFile.reduceByKey(<span class="keyword">lambda</span> x, y: x + y).collect()</span><br><span class="line"><span class="keyword">for</span> _ <span class="keyword">in</span> data:</span><br><span class="line">    print(_)</span><br></pre></td></tr></table></figure>
-
-
-<h3 id="结果"><a href="#结果" class="headerlink" title="结果"></a>结果</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">(3, 2)</span><br><span class="line">(1, 2)</span><br><span class="line">(4, 2)</span><br><span class="line">(2, 2)</span><br><span class="line">(5, 2)</span><br></pre></td></tr></table></figure>
+          <h2 id="rabbitmq-介绍"><a href="#rabbitmq-介绍" class="headerlink" title="rabbitmq 介绍"></a>rabbitmq 介绍</h2><p>接触了一下rabbitmq，原来在选型的时候是在rabbitmq跟kafka之间做选择，网上搜了一下之后发现kafka的优势在于吞吐量，而rabbitmq相对注重可靠性，因为应用在im上，需要保证消息不能丢失所以就暂时选定rabbitmq，<br>Message Queue的需求由来已久，80年代最早在金融交易中，高盛等公司采用Teknekron公司的产品，当时的Message queuing软件叫做：the information bus（TIB）。 TIB被电信和通讯公司采用，路透社收购了Teknekron公司。之后，IBM开发了MQSeries，微软开发了Microsoft Message Queue（MSMQ）。这些商业MQ供应商的问题是厂商锁定，价格高昂。2001年，Java Message queuing试图解决锁定和交互性的问题，但对应用来说反而更加麻烦了。<br>RabbitMQ采用Erlang语言开发。Erlang语言由Ericson设计，专门为开发concurrent和distribution系统的一种语言，在电信领域使用广泛。OTP（Open Telecom Platform）作为Erlang语言的一部分，包含了很多基于Erlang开发的中间件／库／工具，如mnesia／SASL，极大方便了Erlang应用的开发。OTP就类似于Python语言中众多的module，用户借助这些module可以很方便的开发应用。<br>于是2004年，摩根大通和iMatrix开始着手<a href="https://en.wikipedia.org/wiki/Advanced_Message_Queuing_Protocol" target="_blank" rel="noopener">Advanced Message Queuing Protocol （AMQP）</a>开放标准的开发。2006年，AMQP规范发布。2007年，Rabbit技术公司基于AMQP标准开发的RabbitMQ 1.0 发布。所有主要的编程语言均有与代理接口通讯的客户端库。</p>
+<h2 id="简单的使用经验"><a href="#简单的使用经验" class="headerlink" title="简单的使用经验"></a>简单的使用经验</h2><h3 id="通俗的理解"><a href="#通俗的理解" class="headerlink" title="通俗的理解"></a>通俗的理解</h3><p>这里介绍下其中的一些概念，connection表示和队列服务器的连接，一般情况下是tcp连接， channel表示通道，可以在一个连接上建立多个通道，这里主要是节省了tcp连接握手的成本，exchange可以理解成一个路由器，将消息推送给对应的队列queue，其实是像一个订阅的模式。</p>
+<h3 id="集群经验"><a href="#集群经验" class="headerlink" title="集群经验"></a>集群经验</h3><p><code>rabbitmqctl stop</code>这个是关闭rabbitmq，在搭建集群时候先关闭服务，然后使用<code>rabbitmq-server -detached</code>静默启动，这时候使用<code>rabbitmqctl cluster_status</code>查看集群状态，因为还没将节点加入集群，所以只能看到类似</p>
+<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Cluster status of node rabbit@rabbit1 ...</span><br><span class="line">[&#123;nodes,[&#123;disc,[rabbit@rabbit1,rabbit@rabbit2,rabbit@rabbit3]&#125;]&#125;,</span><br><span class="line"> &#123;running_nodes,[rabbit@rabbit2,rabbit@rabbit1]&#125;]</span><br><span class="line">...done.</span><br></pre></td></tr></table></figure>
+<p>然后就可以把当前节点加入集群，</p>
+<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">rabbit2$</span><span class="bash"> rabbitmqctl stop_app <span class="comment">#这个stop_app与stop的区别是前者停的是rabbitmq应用，保留erlang节点，</span></span></span><br><span class="line">                              #后者是停止了rabbitmq和erlang节点</span><br><span class="line">Stopping node rabbit@rabbit2 ...done.</span><br><span class="line"><span class="meta">rabbit2$</span><span class="bash"> rabbitmqctl join_cluster rabbit@rabbit1 <span class="comment">#这里可以用--ram指定将当前节点作为内存节点加入集群</span></span></span><br><span class="line">Clustering node rabbit@rabbit2 with [rabbit@rabbit1] ...done.</span><br><span class="line"><span class="meta">rabbit2$</span><span class="bash"> rabbitmqctl start_app</span></span><br><span class="line">Starting node rabbit@rabbit2 ...done.</span><br></pre></td></tr></table></figure>
+<p>其他可以参考<a href="http://www.rabbitmq.com/clustering.html" target="_blank" rel="noopener">官方文档</a></p>
+<h2 id="一些坑"><a href="#一些坑" class="headerlink" title="一些坑"></a>一些坑</h2><h3 id="消息丢失"><a href="#消息丢失" class="headerlink" title="消息丢失"></a>消息丢失</h3><p>这里碰到过一个坑，对于使用exchange来做消息路由的，会有一个情况，就是在routing_key没被订阅的时候，会将该条找不到路由对应的queue的消息丢掉<code>What happens if we break our contract and send a message with one or four words, like &quot;orange&quot; or &quot;quick.orange.male.rabbit&quot;? Well, these messages won&#39;t match any bindings and will be lost.</code><a href="http://www.rabbitmq.com/tutorials/tutorial-five-python.html" target="_blank" rel="noopener">对应链接</a>,而当使用空的exchange时，会保留消息，当出现消费者的时候就可以将收到之前生产者所推送的消息<a href="http://www.rabbitmq.com/tutorials/tutorial-two-python.html" target="_blank" rel="noopener">对应链接</a>,这里就是用了空的exchange。</p>
+<h3 id="集群搭建"><a href="#集群搭建" class="headerlink" title="集群搭建"></a>集群搭建</h3><p>集群搭建的时候有个erlang vm生成的random cookie，这个是用来做集群之间认证的，相同的cookie才能连接，但是如果通过vim打开复制后在其他几点新建文件写入会多一个换行，导致集群建立是报错，所以这里最好使用scp等传输命令直接传输cookie文件，同时要注意下cookie的文件权限。<br>另外在集群搭建的时候如果更改过hostname，那么要把rabbitmq的数据库删除，否则启动后会马上挂掉</p>
 
       
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@@ -515,7 +542,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/11/10/php-abstract-class-and-interface/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2017/03/28/spark-little-tips/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -529,7 +556,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2016/11/10/php-abstract-class-and-interface/" class="post-title-link" itemprop="url">php-abstract-class-and-interface</a>
+            <a href="/2017/03/28/spark-little-tips/" class="post-title-link" itemprop="url">spark-little-tips</a>
         </h2>
 
         <div class="post-meta">
@@ -539,14 +566,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2016-11-10 10:42:35" itemprop="dateCreated datePublished" datetime="2016-11-10T10:42:35+08:00">2016-11-10</time>
+              <time title="Created: 2017-03-28 19:20:56" itemprop="dateCreated datePublished" datetime="2017-03-28T19:20:56+08:00">2017-03-28</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
+                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
               </span>
             <span class="post-meta-item">
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@@ -554,12 +581,12 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/php/" itemprop="url" rel="index"><span itemprop="name">php</span></a>
+                  <a href="/categories/data-analysis/" itemprop="url" rel="index"><span itemprop="name">data analysis</span></a>
                 </span>
             </span>
 
           
-            <span id="/2016/11/10/php-abstract-class-and-interface/" class="post-meta-item leancloud_visitors" data-flag-title="php-abstract-class-and-interface" title="Views">
+            <span id="/2017/03/28/spark-little-tips/" class="post-meta-item leancloud_visitors" data-flag-title="spark-little-tips" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -574,8 +601,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2016/11/10/php-abstract-class-and-interface/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/11/10/php-abstract-class-and-interface/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2017/03/28/spark-little-tips/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2017/03/28/spark-little-tips/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -590,18 +617,11 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h2 id="PHP抽象类和接口"><a href="#PHP抽象类和接口" class="headerlink" title="PHP抽象类和接口"></a>PHP抽象类和接口</h2><ul>
-<li>抽象类与接口</li>
-<li>抽象类内可以包含非抽象函数，即可实现函数</li>
-<li>抽象类内必须包含至少一个抽象方法，抽象类和接口均不能实例化</li>
-<li>抽象类可以设置访问级别，接口默认都是public</li>
-<li>类可以实现多个接口但不能继承多个抽象类</li>
-<li>类必须实现抽象类和接口里的抽象方法，不一定要实现抽象类的非抽象方法</li>
-<li>接口内不能定义变量，但是可以定义常量</li>
-</ul>
-<h2 id="示例代码"><a href="#示例代码" class="headerlink" title="示例代码"></a>示例代码</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line">&lt;?php</span><br><span class="line">interface int1&#123;</span><br><span class="line">    const INTER1 &#x3D; 111;</span><br><span class="line">    function inter1();</span><br><span class="line">&#125;</span><br><span class="line">interface int2&#123;</span><br><span class="line">    const INTER1 &#x3D; 222;</span><br><span class="line">    function inter2();</span><br><span class="line">&#125;</span><br><span class="line">abstract class abst1&#123;</span><br><span class="line">    public function abstr1()&#123;</span><br><span class="line">        echo 1111;</span><br><span class="line">    &#125;</span><br><span class="line">    abstract function abstra1()&#123;</span><br><span class="line">        echo &#39;ahahahha&#39;;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line">abstract class abst2&#123;</span><br><span class="line">    public function abstr2()&#123;</span><br><span class="line">        echo 1111;</span><br><span class="line">    &#125;</span><br><span class="line">    abstract function abstra2();</span><br><span class="line">&#125;</span><br><span class="line">class normal1 extends abst1&#123;</span><br><span class="line">    protected function abstr2()&#123;</span><br><span class="line">        echo 222;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+          <h2 id="spark-的一些粗浅使用经验"><a href="#spark-的一些粗浅使用经验" class="headerlink" title="spark 的一些粗浅使用经验"></a>spark 的一些粗浅使用经验</h2><p>工作中学习使用了一下Spark做数据分析,主要是用spark的python接口，首先是<code>pyspark.SparkContext(appName=xxx)</code>，这是初始化一个Spark应用实例或者说会话，不能重复，<br>返回的实例句柄就可以调用<code>textFile(path)</code>读取文本文件，这里的文本文件可以是HDFS上的文本文件，也可以普通文本文件，但是需要在Spark的所有集群上都存在，否则会<br>读取失败，<code>parallelize</code>则可以将python生成的集合数据读取后转换成rdd(A Resilient Distributed Dataset (RDD),一种spark下的基本抽象数据集),基于这个RDD就可以做<br>数据的流式计算，例如<code>map reduce</code>,在Spark中可以非常方便地实现  </p>
+<h3 id="简单的mapreduce-word-count示例"><a href="#简单的mapreduce-word-count示例" class="headerlink" title="简单的mapreduce word count示例"></a>简单的mapreduce word count示例</h3><figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">textFile = sc.parallelize([(<span class="number">1</span>,<span class="number">1</span>), (<span class="number">2</span>,<span class="number">1</span>), (<span class="number">3</span>,<span class="number">1</span>), (<span class="number">4</span>,<span class="number">1</span>), (<span class="number">5</span>,<span class="number">1</span>),(<span class="number">1</span>,<span class="number">1</span>), (<span class="number">2</span>,<span class="number">1</span>), (<span class="number">3</span>,<span class="number">1</span>), (<span class="number">4</span>,<span class="number">1</span>), (<span class="number">5</span>,<span class="number">1</span>)])</span><br><span class="line">data = textFile.reduceByKey(<span class="keyword">lambda</span> x, y: x + y).collect()</span><br><span class="line"><span class="keyword">for</span> _ <span class="keyword">in</span> data:</span><br><span class="line">    print(_)</span><br></pre></td></tr></table></figure>
 
-<h2 id="result"><a href="#result" class="headerlink" title="result"></a>result</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">PHP Fatal error:  Abstract function abst1::abstra1() cannot contain body in new.php on line 17</span><br><span class="line"></span><br><span class="line">Fatal error: Abstract function abst1::abstra1() cannot contain body in php on line 17</span><br></pre></td></tr></table></figure>
+
+<h3 id="结果"><a href="#结果" class="headerlink" title="结果"></a>结果</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">(3, 2)</span><br><span class="line">(1, 2)</span><br><span class="line">(4, 2)</span><br><span class="line">(2, 2)</span><br><span class="line">(5, 2)</span><br></pre></td></tr></table></figure>
 
       
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@@ -623,7 +643,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/10/12/summary-ranges-228/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/11/10/php-abstract-class-and-interface/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -637,7 +657,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2016/10/12/summary-ranges-228/" class="post-title-link" itemprop="url">summary-ranges-228</a>
+            <a href="/2016/11/10/php-abstract-class-and-interface/" class="post-title-link" itemprop="url">php-abstract-class-and-interface</a>
         </h2>
 
         <div class="post-meta">
@@ -647,14 +667,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2016-10-12 23:25:17" itemprop="dateCreated datePublished" datetime="2016-10-12T23:25:17+08:00">2016-10-12</time>
+              <time title="Created: 2016-11-10 10:42:35" itemprop="dateCreated datePublished" datetime="2016-11-10T10:42:35+08:00">2016-11-10</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
+                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
               </span>
             <span class="post-meta-item">
               <span class="post-meta-item-icon">
@@ -662,12 +682,12 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a>
+                  <a href="/categories/php/" itemprop="url" rel="index"><span itemprop="name">php</span></a>
                 </span>
             </span>
 
           
-            <span id="/2016/10/12/summary-ranges-228/" class="post-meta-item leancloud_visitors" data-flag-title="summary-ranges-228" title="Views">
+            <span id="/2016/11/10/php-abstract-class-and-interface/" class="post-meta-item leancloud_visitors" data-flag-title="php-abstract-class-and-interface" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
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@@ -682,8 +702,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2016/10/12/summary-ranges-228/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/10/12/summary-ranges-228/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2016/11/10/php-abstract-class-and-interface/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/11/10/php-abstract-class-and-interface/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -698,10 +718,19 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h4 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h4><p>Given a sorted integer array without duplicates, return the summary of its ranges.</p>
-<p>For example, given <code>[0,1,2,4,5,7]</code>, return <code>[&quot;0-&gt;2&quot;,&quot;4-&gt;5&quot;,&quot;7&quot;]</code>.</p>
-<h4 id="题解"><a href="#题解" class="headerlink" title="题解"></a>题解</h4><p>每一个区间的起点<code>nums[i]</code>加上<code>j</code>是否等于<code>nums[i+j]</code><br><a href="http://www.cnblogs.com/grandyang/p/4603555.html" target="_blank" rel="noopener">参考</a></p>
-<h4 id="Code"><a href="#Code" class="headerlink" title="Code"></a>Code</h4><figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> &#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    <span class="function"><span class="built_in">vector</span>&lt;<span class="built_in">string</span>&gt; <span class="title">summaryRanges</span><span class="params">(<span class="built_in">vector</span>&lt;<span class="keyword">int</span>&gt;&amp; nums)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">int</span> i = <span class="number">0</span>, j = <span class="number">1</span>, n;</span><br><span class="line">        <span class="built_in">vector</span>&lt;<span class="built_in">string</span>&gt; res;</span><br><span class="line">        n = nums.<span class="built_in">size</span>();</span><br><span class="line">        <span class="keyword">while</span>(i &lt; n)&#123;</span><br><span class="line">            j = <span class="number">1</span>;</span><br><span class="line">            <span class="keyword">while</span>(j &lt; n &amp;&amp; nums[i+j] - nums[i] == j) j++;</span><br><span class="line">            res.push_back(j &lt;= <span class="number">1</span> ? to_string(nums[i]) : to_string(nums[i]) + <span class="string">"-&gt;"</span> + to_string(nums[i + j - <span class="number">1</span>]));</span><br><span class="line">            i += j;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> res;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
+          <h2 id="PHP抽象类和接口"><a href="#PHP抽象类和接口" class="headerlink" title="PHP抽象类和接口"></a>PHP抽象类和接口</h2><ul>
+<li>抽象类与接口</li>
+<li>抽象类内可以包含非抽象函数，即可实现函数</li>
+<li>抽象类内必须包含至少一个抽象方法，抽象类和接口均不能实例化</li>
+<li>抽象类可以设置访问级别，接口默认都是public</li>
+<li>类可以实现多个接口但不能继承多个抽象类</li>
+<li>类必须实现抽象类和接口里的抽象方法，不一定要实现抽象类的非抽象方法</li>
+<li>接口内不能定义变量，但是可以定义常量</li>
+</ul>
+<h2 id="示例代码"><a href="#示例代码" class="headerlink" title="示例代码"></a>示例代码</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line">&lt;?php</span><br><span class="line">interface int1&#123;</span><br><span class="line">    const INTER1 &#x3D; 111;</span><br><span class="line">    function inter1();</span><br><span class="line">&#125;</span><br><span class="line">interface int2&#123;</span><br><span class="line">    const INTER1 &#x3D; 222;</span><br><span class="line">    function inter2();</span><br><span class="line">&#125;</span><br><span class="line">abstract class abst1&#123;</span><br><span class="line">    public function abstr1()&#123;</span><br><span class="line">        echo 1111;</span><br><span class="line">    &#125;</span><br><span class="line">    abstract function abstra1()&#123;</span><br><span class="line">        echo &#39;ahahahha&#39;;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line">abstract class abst2&#123;</span><br><span class="line">    public function abstr2()&#123;</span><br><span class="line">        echo 1111;</span><br><span class="line">    &#125;</span><br><span class="line">    abstract function abstra2();</span><br><span class="line">&#125;</span><br><span class="line">class normal1 extends abst1&#123;</span><br><span class="line">    protected function abstr2()&#123;</span><br><span class="line">        echo 222;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+
+<h2 id="result"><a href="#result" class="headerlink" title="result"></a>result</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">PHP Fatal error:  Abstract function abst1::abstra1() cannot contain body in new.php on line 17</span><br><span class="line"></span><br><span class="line">Fatal error: Abstract function abst1::abstra1() cannot contain body in php on line 17</span><br></pre></td></tr></table></figure>
+
       
     </div>
 
@@ -789,7 +818,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -864,7 +893,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/page/14/index.html b/page/14/index.html
index 2ffda66e63..f809152cc5 100644
--- a/page/14/index.html
+++ b/page/14/index.html
@@ -204,7 +204,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/10/11/minimum-size-subarray-sum-209/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/10/12/summary-ranges-228/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -218,7 +218,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2016/10/11/minimum-size-subarray-sum-209/" class="post-title-link" itemprop="url">minimum-size-subarray-sum-209</a>
+            <a href="/2016/10/12/summary-ranges-228/" class="post-title-link" itemprop="url">summary-ranges-228</a>
         </h2>
 
         <div class="post-meta">
@@ -228,14 +228,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2016-10-11 22:04:28" itemprop="dateCreated datePublished" datetime="2016-10-11T22:04:28+08:00">2016-10-11</time>
+              <time title="Created: 2016-10-12 23:25:17" itemprop="dateCreated datePublished" datetime="2016-10-12T23:25:17+08:00">2016-10-12</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
+                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
               </span>
             <span class="post-meta-item">
               <span class="post-meta-item-icon">
@@ -248,7 +248,7 @@
             </span>
 
           
-            <span id="/2016/10/11/minimum-size-subarray-sum-209/" class="post-meta-item leancloud_visitors" data-flag-title="minimum-size-subarray-sum-209" title="Views">
+            <span id="/2016/10/12/summary-ranges-228/" class="post-meta-item leancloud_visitors" data-flag-title="summary-ranges-228" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -263,8 +263,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2016/10/11/minimum-size-subarray-sum-209/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/10/11/minimum-size-subarray-sum-209/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2016/10/12/summary-ranges-228/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/10/12/summary-ranges-228/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -279,11 +279,10 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>Given an array of n positive integers and a positive integer s, find the minimal length of a subarray of which the sum ≥ s. If there isn’t one, return 0 instead.  </p>
-<p>For example, given the array <code>[2,3,1,2,4,3]</code> and <code>s = 7</code>,<br>the subarray <code>[4,3]</code> has the minimal length under the problem constraint.  </p>
-<h4 id="题解"><a href="#题解" class="headerlink" title="题解"></a>题解</h4><p>参考，滑动窗口，跟之前Data Structure课上的online算法有点像，<a href="http://blog.csdn.net/lisonglisonglisong/article/details/45666975" target="_blank" rel="noopener">链接</a>  </p>
-<h4 id="Code"><a href="#Code" class="headerlink" title="Code"></a>Code</h4><figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> &#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    <span class="function"><span class="keyword">int</span> <span class="title">minSubArrayLen</span><span class="params">(<span class="keyword">int</span> s, <span class="built_in">vector</span>&lt;<span class="keyword">int</span>&gt;&amp; nums)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">int</span> len = nums.<span class="built_in">size</span>();</span><br><span class="line">        <span class="keyword">if</span>(len == <span class="number">0</span>) <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">        <span class="keyword">int</span> minlen = INT_MAX;</span><br><span class="line">        <span class="keyword">int</span> sum = <span class="number">0</span>;</span><br><span class="line">        </span><br><span class="line">        <span class="keyword">int</span> left = <span class="number">0</span>;</span><br><span class="line">        <span class="keyword">int</span> right = <span class="number">-1</span>;</span><br><span class="line">        <span class="keyword">while</span>(right &lt; len)</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">while</span>(sum &lt; s &amp;&amp; right &lt; len)</span><br><span class="line">                sum += nums[++right];</span><br><span class="line">            <span class="keyword">if</span>(sum &gt;= s)</span><br><span class="line">            &#123;</span><br><span class="line">                minlen = minlen &lt; right - left + <span class="number">1</span> ? minlen : right - left + <span class="number">1</span>;</span><br><span class="line">                sum -= nums[left++];</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> minlen &gt; len ? <span class="number">0</span> : minlen;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
-
+          <h4 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h4><p>Given a sorted integer array without duplicates, return the summary of its ranges.</p>
+<p>For example, given <code>[0,1,2,4,5,7]</code>, return <code>[&quot;0-&gt;2&quot;,&quot;4-&gt;5&quot;,&quot;7&quot;]</code>.</p>
+<h4 id="题解"><a href="#题解" class="headerlink" title="题解"></a>题解</h4><p>每一个区间的起点<code>nums[i]</code>加上<code>j</code>是否等于<code>nums[i+j]</code><br><a href="http://www.cnblogs.com/grandyang/p/4603555.html" target="_blank" rel="noopener">参考</a></p>
+<h4 id="Code"><a href="#Code" class="headerlink" title="Code"></a>Code</h4><figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> &#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    <span class="function"><span class="built_in">vector</span>&lt;<span class="built_in">string</span>&gt; <span class="title">summaryRanges</span><span class="params">(<span class="built_in">vector</span>&lt;<span class="keyword">int</span>&gt;&amp; nums)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">int</span> i = <span class="number">0</span>, j = <span class="number">1</span>, n;</span><br><span class="line">        <span class="built_in">vector</span>&lt;<span class="built_in">string</span>&gt; res;</span><br><span class="line">        n = nums.<span class="built_in">size</span>();</span><br><span class="line">        <span class="keyword">while</span>(i &lt; n)&#123;</span><br><span class="line">            j = <span class="number">1</span>;</span><br><span class="line">            <span class="keyword">while</span>(j &lt; n &amp;&amp; nums[i+j] - nums[i] == j) j++;</span><br><span class="line">            res.push_back(j &lt;= <span class="number">1</span> ? to_string(nums[i]) : to_string(nums[i]) + <span class="string">"-&gt;"</span> + to_string(nums[i + j - <span class="number">1</span>]));</span><br><span class="line">            i += j;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> res;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
       
     </div>
 
@@ -304,7 +303,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/09/29/binary-watch/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/10/11/minimum-size-subarray-sum-209/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -318,7 +317,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2016/09/29/binary-watch/" class="post-title-link" itemprop="url">binary-watch</a>
+            <a href="/2016/10/11/minimum-size-subarray-sum-209/" class="post-title-link" itemprop="url">minimum-size-subarray-sum-209</a>
         </h2>
 
         <div class="post-meta">
@@ -328,7 +327,7 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2016-09-29 23:16:06" itemprop="dateCreated datePublished" datetime="2016-09-29T23:16:06+08:00">2016-09-29</time>
+              <time title="Created: 2016-10-11 22:04:28" itemprop="dateCreated datePublished" datetime="2016-10-11T22:04:28+08:00">2016-10-11</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
@@ -348,7 +347,7 @@
             </span>
 
           
-            <span id="/2016/09/29/binary-watch/" class="post-meta-item leancloud_visitors" data-flag-title="binary-watch" title="Views">
+            <span id="/2016/10/11/minimum-size-subarray-sum-209/" class="post-meta-item leancloud_visitors" data-flag-title="minimum-size-subarray-sum-209" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -363,8 +362,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2016/09/29/binary-watch/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/09/29/binary-watch/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2016/10/11/minimum-size-subarray-sum-209/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/10/11/minimum-size-subarray-sum-209/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -379,19 +378,11 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>A binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the minutes (0-59).  </p>
-<p>Each LED represents a zero or one, with the least significant bit on the right.  </p>
-<p><img data-src="http://7sbp1g.com1.z0.glb.clouddn.com/Binary_clock_samui_moon.jpg?imageView2/2/w/620" alt=""></p>
-<p>For example, the above binary watch reads “3:25”.  </p>
-<p>Given a non-negative integer n which represents the number of LEDs that are currently on, return all possible times the watch could represent.  </p>
-<h4 id="Example"><a href="#Example" class="headerlink" title="Example:"></a>Example:</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Input: n &#x3D; 1</span><br><span class="line">Return: [&quot;1:00&quot;, &quot;2:00&quot;, &quot;4:00&quot;, &quot;8:00&quot;, &quot;0:01&quot;, &quot;0:02&quot;, &quot;0:04&quot;, &quot;0:08&quot;, &quot;0:16&quot;, &quot;0:32&quot;]</span><br></pre></td></tr></table></figure>
-<h4 id="Note"><a href="#Note" class="headerlink" title="Note:"></a>Note:</h4><ul>
-<li>The order of output does not matter.</li>
-<li>The hour must not contain a leading zero, for example “01:00” is not valid, it should be “1:00”.</li>
-<li>The minute must be consist of two digits and may contain a leading zero, for example “10:2” is not valid, it should be “10:02”.</li>
-</ul>
-<h3 id="题解"><a href="#题解" class="headerlink" title="题解"></a>题解</h3><p>又是参（chao）考（xi）别人的代码，嗯，就是这么不要脸，<a href="http://www.cnblogs.com/grandyang/p/5896454.html" target="_blank" rel="noopener">链接</a></p>
-<h4 id="Code"><a href="#Code" class="headerlink" title="Code"></a>Code</h4><figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> &#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    <span class="function"><span class="built_in">vector</span>&lt;<span class="built_in">string</span>&gt; <span class="title">readBinaryWatch</span><span class="params">(<span class="keyword">int</span> num)</span> </span>&#123;</span><br><span class="line">        <span class="built_in">vector</span>&lt;<span class="built_in">string</span>&gt; res;</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">int</span> h = <span class="number">0</span>; h &lt; <span class="number">12</span>; ++h) &#123;</span><br><span class="line">            <span class="keyword">for</span> (<span class="keyword">int</span> m = <span class="number">0</span>; m &lt; <span class="number">60</span>; ++m) &#123;</span><br><span class="line">                <span class="keyword">if</span> (<span class="built_in">bitset</span>&lt;<span class="number">10</span>&gt;((h &lt;&lt; <span class="number">6</span>) + m).count() == num) &#123;</span><br><span class="line">                    res.push_back(to_string(h) + (m &lt; <span class="number">10</span> ? <span class="string">":0"</span> : <span class="string">":"</span>) + to_string(m));</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> res;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
+          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>Given an array of n positive integers and a positive integer s, find the minimal length of a subarray of which the sum ≥ s. If there isn’t one, return 0 instead.  </p>
+<p>For example, given the array <code>[2,3,1,2,4,3]</code> and <code>s = 7</code>,<br>the subarray <code>[4,3]</code> has the minimal length under the problem constraint.  </p>
+<h4 id="题解"><a href="#题解" class="headerlink" title="题解"></a>题解</h4><p>参考，滑动窗口，跟之前Data Structure课上的online算法有点像，<a href="http://blog.csdn.net/lisonglisonglisong/article/details/45666975" target="_blank" rel="noopener">链接</a>  </p>
+<h4 id="Code"><a href="#Code" class="headerlink" title="Code"></a>Code</h4><figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> &#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    <span class="function"><span class="keyword">int</span> <span class="title">minSubArrayLen</span><span class="params">(<span class="keyword">int</span> s, <span class="built_in">vector</span>&lt;<span class="keyword">int</span>&gt;&amp; nums)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">int</span> len = nums.<span class="built_in">size</span>();</span><br><span class="line">        <span class="keyword">if</span>(len == <span class="number">0</span>) <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">        <span class="keyword">int</span> minlen = INT_MAX;</span><br><span class="line">        <span class="keyword">int</span> sum = <span class="number">0</span>;</span><br><span class="line">        </span><br><span class="line">        <span class="keyword">int</span> left = <span class="number">0</span>;</span><br><span class="line">        <span class="keyword">int</span> right = <span class="number">-1</span>;</span><br><span class="line">        <span class="keyword">while</span>(right &lt; len)</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">while</span>(sum &lt; s &amp;&amp; right &lt; len)</span><br><span class="line">                sum += nums[++right];</span><br><span class="line">            <span class="keyword">if</span>(sum &gt;= s)</span><br><span class="line">            &#123;</span><br><span class="line">                minlen = minlen &lt; right - left + <span class="number">1</span> ? minlen : right - left + <span class="number">1</span>;</span><br><span class="line">                sum -= nums[left++];</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> minlen &gt; len ? <span class="number">0</span> : minlen;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
+
       
     </div>
 
@@ -412,7 +403,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/08/14/34-Search-for-a-Range/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/09/29/binary-watch/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -426,7 +417,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2016/08/14/34-Search-for-a-Range/" class="post-title-link" itemprop="url">34_Search_for_a_Range</a>
+            <a href="/2016/09/29/binary-watch/" class="post-title-link" itemprop="url">binary-watch</a>
         </h2>
 
         <div class="post-meta">
@@ -436,7 +427,7 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2016-08-14 21:33:24" itemprop="dateCreated datePublished" datetime="2016-08-14T21:33:24+08:00">2016-08-14</time>
+              <time title="Created: 2016-09-29 23:16:06" itemprop="dateCreated datePublished" datetime="2016-09-29T23:16:06+08:00">2016-09-29</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
@@ -456,7 +447,7 @@
             </span>
 
           
-            <span id="/2016/08/14/34-Search-for-a-Range/" class="post-meta-item leancloud_visitors" data-flag-title="34_Search_for_a_Range" title="Views">
+            <span id="/2016/09/29/binary-watch/" class="post-meta-item leancloud_visitors" data-flag-title="binary-watch" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -471,8 +462,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2016/08/14/34-Search-for-a-Range/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/08/14/34-Search-for-a-Range/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2016/09/29/binary-watch/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/09/29/binary-watch/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -487,13 +478,19 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h2 id="question"><a href="#question" class="headerlink" title="question"></a>question</h2><h3 id="34-Search-for-a-Range"><a href="#34-Search-for-a-Range" class="headerlink" title="34. Search for a Range"></a>34. Search for a Range</h3><p><a href="https://leetcode.com/problems/search-for-a-range/" target="_blank" rel="noopener">Original Page</a></p>
-<p>Given a sorted array of integers, find the starting and ending position of a given target value.</p>
-<p>Your algorithm’s runtime complexity must be in the order of <em>O</em>(log <em>n</em>).</p>
-<p>If the target is not found in the array, return <code>[-1, -1]</code>.</p>
-<p>For example,<br>Given <code>[5, 7, 7, 8, 8, 10]</code> and target value 8,<br>return <code>[3, 4]</code>.</p>
-<h2 id="analysis"><a href="#analysis" class="headerlink" title="analysis"></a>analysis</h2><p>一开始就想到了二分查找，但是原来做二分查找的时候一般都是找到确定的那个数就完成了，<br>这里的情况比较特殊，需要找到整个区间，所以需要两遍查找，并且一个是找到小于target<br>的最大索引，一个是找到大于target的最大索引，代码参考<a href="https://discuss.leetcode.com/topic/5891/clean-iterative-solution-with-two-binary-searches-with-explanation/2" target="_blank" rel="noopener">leetcode discuss</a>,这位仁<br>兄也做了详细的分析解释。  </p>
-<h2 id="code"><a href="#code" class="headerlink" title="code"></a>code</h2><figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> &#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    <span class="function"><span class="built_in">vector</span>&lt;<span class="keyword">int</span>&gt; <span class="title">searchRange</span><span class="params">(<span class="built_in">vector</span>&lt;<span class="keyword">int</span>&gt;&amp; nums, <span class="keyword">int</span> target)</span> </span>&#123;</span><br><span class="line">        <span class="function"><span class="built_in">vector</span>&lt;<span class="keyword">int</span>&gt; <span class="title">ret</span><span class="params">(<span class="number">2</span>, <span class="number">-1</span>)</span></span>;</span><br><span class="line">        <span class="keyword">int</span> i = <span class="number">0</span>, j = nums.<span class="built_in">size</span>() - <span class="number">1</span>;</span><br><span class="line">        <span class="keyword">int</span> mid;</span><br><span class="line">        <span class="keyword">while</span>(i &lt; j)&#123;</span><br><span class="line">            mid = (i + j) / <span class="number">2</span>;</span><br><span class="line">            <span class="keyword">if</span>(nums[mid] &lt; target) i = mid + <span class="number">1</span>;</span><br><span class="line">            <span class="keyword">else</span> j = mid;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">if</span>(nums[i] != target) <span class="keyword">return</span> ret;</span><br><span class="line">        <span class="keyword">else</span> &#123;</span><br><span class="line">            ret[<span class="number">0</span>] = i;</span><br><span class="line">            <span class="keyword">if</span>((i+<span class="number">1</span>) &lt; (nums.<span class="built_in">size</span>() - <span class="number">1</span>) &amp;&amp; nums[i+<span class="number">1</span>] &gt; target)&#123;</span><br><span class="line">                ret[<span class="number">1</span>] = i;</span><br><span class="line">                <span class="keyword">return</span> ret;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;   <span class="comment">//一点小优化</span></span><br><span class="line">        j = nums.<span class="built_in">size</span>() - <span class="number">1</span>;</span><br><span class="line">        <span class="keyword">while</span>(i &lt; j)&#123;</span><br><span class="line">            mid = (i + j) / <span class="number">2</span> + <span class="number">1</span>;</span><br><span class="line">            <span class="keyword">if</span>(nums[mid] &gt; target) j = mid - <span class="number">1</span>;</span><br><span class="line">            <span class="keyword">else</span> i = mid;</span><br><span class="line">        &#125;</span><br><span class="line">        ret[<span class="number">1</span>] = j;</span><br><span class="line">        <span class="keyword">return</span> ret;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
+          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>A binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the minutes (0-59).  </p>
+<p>Each LED represents a zero or one, with the least significant bit on the right.  </p>
+<p><img data-src="http://7sbp1g.com1.z0.glb.clouddn.com/Binary_clock_samui_moon.jpg?imageView2/2/w/620" alt=""></p>
+<p>For example, the above binary watch reads “3:25”.  </p>
+<p>Given a non-negative integer n which represents the number of LEDs that are currently on, return all possible times the watch could represent.  </p>
+<h4 id="Example"><a href="#Example" class="headerlink" title="Example:"></a>Example:</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Input: n &#x3D; 1</span><br><span class="line">Return: [&quot;1:00&quot;, &quot;2:00&quot;, &quot;4:00&quot;, &quot;8:00&quot;, &quot;0:01&quot;, &quot;0:02&quot;, &quot;0:04&quot;, &quot;0:08&quot;, &quot;0:16&quot;, &quot;0:32&quot;]</span><br></pre></td></tr></table></figure>
+<h4 id="Note"><a href="#Note" class="headerlink" title="Note:"></a>Note:</h4><ul>
+<li>The order of output does not matter.</li>
+<li>The hour must not contain a leading zero, for example “01:00” is not valid, it should be “1:00”.</li>
+<li>The minute must be consist of two digits and may contain a leading zero, for example “10:2” is not valid, it should be “10:02”.</li>
+</ul>
+<h3 id="题解"><a href="#题解" class="headerlink" title="题解"></a>题解</h3><p>又是参（chao）考（xi）别人的代码，嗯，就是这么不要脸，<a href="http://www.cnblogs.com/grandyang/p/5896454.html" target="_blank" rel="noopener">链接</a></p>
+<h4 id="Code"><a href="#Code" class="headerlink" title="Code"></a>Code</h4><figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> &#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    <span class="function"><span class="built_in">vector</span>&lt;<span class="built_in">string</span>&gt; <span class="title">readBinaryWatch</span><span class="params">(<span class="keyword">int</span> num)</span> </span>&#123;</span><br><span class="line">        <span class="built_in">vector</span>&lt;<span class="built_in">string</span>&gt; res;</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">int</span> h = <span class="number">0</span>; h &lt; <span class="number">12</span>; ++h) &#123;</span><br><span class="line">            <span class="keyword">for</span> (<span class="keyword">int</span> m = <span class="number">0</span>; m &lt; <span class="number">60</span>; ++m) &#123;</span><br><span class="line">                <span class="keyword">if</span> (<span class="built_in">bitset</span>&lt;<span class="number">10</span>&gt;((h &lt;&lt; <span class="number">6</span>) + m).count() == num) &#123;</span><br><span class="line">                    res.push_back(to_string(h) + (m &lt; <span class="number">10</span> ? <span class="string">":0"</span> : <span class="string">":"</span>) + to_string(m));</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> res;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
       
     </div>
 
@@ -514,7 +511,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/08/14/docker-mysql-cluster/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/08/14/34-Search-for-a-Range/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -528,7 +525,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2016/08/14/docker-mysql-cluster/" class="post-title-link" itemprop="url">docker-mysql-cluster</a>
+            <a href="/2016/08/14/34-Search-for-a-Range/" class="post-title-link" itemprop="url">34_Search_for_a_Range</a>
         </h2>
 
         <div class="post-meta">
@@ -538,7 +535,7 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2016-08-14 16:51:00" itemprop="dateCreated datePublished" datetime="2016-08-14T16:51:00+08:00">2016-08-14</time>
+              <time title="Created: 2016-08-14 21:33:24" itemprop="dateCreated datePublished" datetime="2016-08-14T21:33:24+08:00">2016-08-14</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
@@ -553,12 +550,12 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/docker/" itemprop="url" rel="index"><span itemprop="name">docker</span></a>
+                  <a href="/categories/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a>
                 </span>
             </span>
 
           
-            <span id="/2016/08/14/docker-mysql-cluster/" class="post-meta-item leancloud_visitors" data-flag-title="docker-mysql-cluster" title="Views">
+            <span id="/2016/08/14/34-Search-for-a-Range/" class="post-meta-item leancloud_visitors" data-flag-title="34_Search_for_a_Range" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -573,8 +570,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2016/08/14/docker-mysql-cluster/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/08/14/docker-mysql-cluster/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2016/08/14/34-Search-for-a-Range/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/08/14/34-Search-for-a-Range/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -589,15 +586,13 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h3 id="docker-mysql-cluster"><a href="#docker-mysql-cluster" class="headerlink" title="docker-mysql-cluster"></a>docker-mysql-cluster</h3><p>基于docker搭了个mysql集群，稍微记一下，<br>首先是新建mysql主库容<br>
-          <!--noindex-->
-            <div class="post-button">
-              <a class="btn" href="/2016/08/14/docker-mysql-cluster/#more" rel="contents">
-                Read more &raquo;
-              </a>
-            </div>
-          <!--/noindex-->
-        
+          <h2 id="question"><a href="#question" class="headerlink" title="question"></a>question</h2><h3 id="34-Search-for-a-Range"><a href="#34-Search-for-a-Range" class="headerlink" title="34. Search for a Range"></a>34. Search for a Range</h3><p><a href="https://leetcode.com/problems/search-for-a-range/" target="_blank" rel="noopener">Original Page</a></p>
+<p>Given a sorted array of integers, find the starting and ending position of a given target value.</p>
+<p>Your algorithm’s runtime complexity must be in the order of <em>O</em>(log <em>n</em>).</p>
+<p>If the target is not found in the array, return <code>[-1, -1]</code>.</p>
+<p>For example,<br>Given <code>[5, 7, 7, 8, 8, 10]</code> and target value 8,<br>return <code>[3, 4]</code>.</p>
+<h2 id="analysis"><a href="#analysis" class="headerlink" title="analysis"></a>analysis</h2><p>一开始就想到了二分查找，但是原来做二分查找的时候一般都是找到确定的那个数就完成了，<br>这里的情况比较特殊，需要找到整个区间，所以需要两遍查找，并且一个是找到小于target<br>的最大索引，一个是找到大于target的最大索引，代码参考<a href="https://discuss.leetcode.com/topic/5891/clean-iterative-solution-with-two-binary-searches-with-explanation/2" target="_blank" rel="noopener">leetcode discuss</a>,这位仁<br>兄也做了详细的分析解释。  </p>
+<h2 id="code"><a href="#code" class="headerlink" title="code"></a>code</h2><figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> &#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    <span class="function"><span class="built_in">vector</span>&lt;<span class="keyword">int</span>&gt; <span class="title">searchRange</span><span class="params">(<span class="built_in">vector</span>&lt;<span class="keyword">int</span>&gt;&amp; nums, <span class="keyword">int</span> target)</span> </span>&#123;</span><br><span class="line">        <span class="function"><span class="built_in">vector</span>&lt;<span class="keyword">int</span>&gt; <span class="title">ret</span><span class="params">(<span class="number">2</span>, <span class="number">-1</span>)</span></span>;</span><br><span class="line">        <span class="keyword">int</span> i = <span class="number">0</span>, j = nums.<span class="built_in">size</span>() - <span class="number">1</span>;</span><br><span class="line">        <span class="keyword">int</span> mid;</span><br><span class="line">        <span class="keyword">while</span>(i &lt; j)&#123;</span><br><span class="line">            mid = (i + j) / <span class="number">2</span>;</span><br><span class="line">            <span class="keyword">if</span>(nums[mid] &lt; target) i = mid + <span class="number">1</span>;</span><br><span class="line">            <span class="keyword">else</span> j = mid;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">if</span>(nums[i] != target) <span class="keyword">return</span> ret;</span><br><span class="line">        <span class="keyword">else</span> &#123;</span><br><span class="line">            ret[<span class="number">0</span>] = i;</span><br><span class="line">            <span class="keyword">if</span>((i+<span class="number">1</span>) &lt; (nums.<span class="built_in">size</span>() - <span class="number">1</span>) &amp;&amp; nums[i+<span class="number">1</span>] &gt; target)&#123;</span><br><span class="line">                ret[<span class="number">1</span>] = i;</span><br><span class="line">                <span class="keyword">return</span> ret;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;   <span class="comment">//一点小优化</span></span><br><span class="line">        j = nums.<span class="built_in">size</span>() - <span class="number">1</span>;</span><br><span class="line">        <span class="keyword">while</span>(i &lt; j)&#123;</span><br><span class="line">            mid = (i + j) / <span class="number">2</span> + <span class="number">1</span>;</span><br><span class="line">            <span class="keyword">if</span>(nums[mid] &gt; target) j = mid - <span class="number">1</span>;</span><br><span class="line">            <span class="keyword">else</span> i = mid;</span><br><span class="line">        &#125;</span><br><span class="line">        ret[<span class="number">1</span>] = j;</span><br><span class="line">        <span class="keyword">return</span> ret;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
       
     </div>
 
@@ -618,7 +613,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/07/13/swoole-websocket-test/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/08/14/docker-mysql-cluster/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -632,7 +627,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2016/07/13/swoole-websocket-test/" class="post-title-link" itemprop="url">swoole-websocket-test</a>
+            <a href="/2016/08/14/docker-mysql-cluster/" class="post-title-link" itemprop="url">docker-mysql-cluster</a>
         </h2>
 
         <div class="post-meta">
@@ -642,14 +637,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2016-07-13 22:59:23" itemprop="dateCreated datePublished" datetime="2016-07-13T22:59:23+08:00">2016-07-13</time>
+              <time title="Created: 2016-08-14 16:51:00" itemprop="dateCreated datePublished" datetime="2016-08-14T16:51:00+08:00">2016-08-14</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
+                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
               </span>
             <span class="post-meta-item">
               <span class="post-meta-item-icon">
@@ -657,12 +652,12 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/php/" itemprop="url" rel="index"><span itemprop="name">php</span></a>
+                  <a href="/categories/docker/" itemprop="url" rel="index"><span itemprop="name">docker</span></a>
                 </span>
             </span>
 
           
-            <span id="/2016/07/13/swoole-websocket-test/" class="post-meta-item leancloud_visitors" data-flag-title="swoole-websocket-test" title="Views">
+            <span id="/2016/08/14/docker-mysql-cluster/" class="post-meta-item leancloud_visitors" data-flag-title="docker-mysql-cluster" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -677,8 +672,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2016/07/13/swoole-websocket-test/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/07/13/swoole-websocket-test/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2016/08/14/docker-mysql-cluster/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/08/14/docker-mysql-cluster/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -693,11 +688,10 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h3 id="玩一下swoole的websocket"><a href="#玩一下swoole的websocket" class="headerlink" title="玩一下swoole的websocket"></a>玩一下swoole的websocket</h3><p>WebSocket是HTML5开始提供的一种在单个<a href="https://zh.wikipedia.org/wiki/TCP" target="_blank" rel="noopener">TCP</a>连接上进行<a href="https://zh.wikipedia.org/wiki/%E5%85%A8%E9%9B%99%E5%B7%A5" target="_blank" rel="noopener">全双工</a>通讯的协议。WebSocket通信协议于2011年被<a href="https://zh.wikipedia.org/wiki/Internet_Engineering_Task_Force" target="_blank" rel="noopener">IETF</a>定为标准RFC 6455，WebSocketAPI被W3C定为标准。<br>,在web私信，im等应用较多。背景和优缺点可以参看<a href="https://zh.wikipedia.org/wiki/WebSocket" target="_blank" rel="noopener">wiki</a>。</p>
-<h3 id="环境准备"><a href="#环境准备" class="headerlink" title="环境准备"></a>环境准备</h3><p>因为swoole官方还不支持windows，所以需要装下linux,之前都是用ubuntu，<br>这次就试一下centos7，还是满好看的，虽然虚拟机会默认最小安装，需要在安装<br>时自己选择带gnome的，当然最小安装也是可以的，只是最后需要改下防火墙。<br>然后是装下PHP，Nginx什么的，我是用<a href="https://oneinstack.com/" target="_blank" rel="noopener">Oneinstack</a>，可以按需安装<br>给做这个的大大点个赞。</p>
+          <h3 id="docker-mysql-cluster"><a href="#docker-mysql-cluster" class="headerlink" title="docker-mysql-cluster"></a>docker-mysql-cluster</h3><p>基于docker搭了个mysql集群，稍微记一下，<br>首先是新建mysql主库容<br>
           <!--noindex-->
             <div class="post-button">
-              <a class="btn" href="/2016/07/13/swoole-websocket-test/#more" rel="contents">
+              <a class="btn" href="/2016/08/14/docker-mysql-cluster/#more" rel="contents">
                 Read more &raquo;
               </a>
             </div>
@@ -790,7 +784,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -865,7 +859,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/page/15/index.html b/page/15/index.html
index 43a8b74abb..e9e8594832 100644
--- a/page/15/index.html
+++ b/page/15/index.html
@@ -204,7 +204,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/06/22/invert-binary-tree/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2016/07/13/swoole-websocket-test/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -218,7 +218,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2015/06/22/invert-binary-tree/" class="post-title-link" itemprop="url">invert-binary-tree</a>
+            <a href="/2016/07/13/swoole-websocket-test/" class="post-title-link" itemprop="url">swoole-websocket-test</a>
         </h2>
 
         <div class="post-meta">
@@ -228,7 +228,7 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2015-06-22 10:29:44" itemprop="dateCreated datePublished" datetime="2015-06-22T10:29:44+08:00">2015-06-22</time>
+              <time title="Created: 2016-07-13 22:59:23" itemprop="dateCreated datePublished" datetime="2016-07-13T22:59:23+08:00">2016-07-13</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
@@ -243,12 +243,12 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a>
+                  <a href="/categories/php/" itemprop="url" rel="index"><span itemprop="name">php</span></a>
                 </span>
             </span>
 
           
-            <span id="/2015/06/22/invert-binary-tree/" class="post-meta-item leancloud_visitors" data-flag-title="invert-binary-tree" title="Views">
+            <span id="/2016/07/13/swoole-websocket-test/" class="post-meta-item leancloud_visitors" data-flag-title="swoole-websocket-test" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -263,8 +263,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2015/06/22/invert-binary-tree/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/06/22/invert-binary-tree/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2016/07/13/swoole-websocket-test/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2016/07/13/swoole-websocket-test/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -279,21 +279,16 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <p><strong>Invert a binary tree</strong></p>
-<pre><code>     4
-   /   \
-  2     7
- / \   / \
-1   3 6   9</code></pre><p>to</p>
-<pre><code>     4
-   /   \
-  7     2
- / \   / \
-9   6 3   1</code></pre><p><strong>Trivia:</strong><br>This problem was inspired by <a href="https://twitter.com/mxcl/status/608682016205344768" target="_blank" rel="noopener">this original tweet</a> by <a href="https://twitter.com/mxcl" target="_blank" rel="noopener">Max Howell</a>:</p>
-<blockquote>
-<p>Google: 90% of our engineers use the software you wrote (Homebrew),<br>but you can’t invert a binary tree on a whiteboard so fuck off.  </p>
-</blockquote>
-<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Definition for a binary tree node.</span></span><br><span class="line"><span class="comment"> * struct TreeNode &#123;</span></span><br><span class="line"><span class="comment"> *     int val;</span></span><br><span class="line"><span class="comment"> *     TreeNode *left;</span></span><br><span class="line"><span class="comment"> *     TreeNode *right;</span></span><br><span class="line"><span class="comment"> *     TreeNode(int x) : val(x), left(NULL), right(NULL) &#123;&#125;</span></span><br><span class="line"><span class="comment"> * &#125;;</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> &#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    <span class="function">TreeNode* <span class="title">invertTree</span><span class="params">(TreeNode* root)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">if</span>(root == <span class="literal">NULL</span>) <span class="keyword">return</span> root;</span><br><span class="line">        TreeNode* temp;</span><br><span class="line">        temp = invertTree(root-&gt;left);</span><br><span class="line">        root-&gt;left = invertTree(root-&gt;right);</span><br><span class="line">        root-&gt;right = temp;</span><br><span class="line">        <span class="keyword">return</span> root;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
+          <h3 id="玩一下swoole的websocket"><a href="#玩一下swoole的websocket" class="headerlink" title="玩一下swoole的websocket"></a>玩一下swoole的websocket</h3><p>WebSocket是HTML5开始提供的一种在单个<a href="https://zh.wikipedia.org/wiki/TCP" target="_blank" rel="noopener">TCP</a>连接上进行<a href="https://zh.wikipedia.org/wiki/%E5%85%A8%E9%9B%99%E5%B7%A5" target="_blank" rel="noopener">全双工</a>通讯的协议。WebSocket通信协议于2011年被<a href="https://zh.wikipedia.org/wiki/Internet_Engineering_Task_Force" target="_blank" rel="noopener">IETF</a>定为标准RFC 6455，WebSocketAPI被W3C定为标准。<br>,在web私信，im等应用较多。背景和优缺点可以参看<a href="https://zh.wikipedia.org/wiki/WebSocket" target="_blank" rel="noopener">wiki</a>。</p>
+<h3 id="环境准备"><a href="#环境准备" class="headerlink" title="环境准备"></a>环境准备</h3><p>因为swoole官方还不支持windows，所以需要装下linux,之前都是用ubuntu，<br>这次就试一下centos7，还是满好看的，虽然虚拟机会默认最小安装，需要在安装<br>时自己选择带gnome的，当然最小安装也是可以的，只是最后需要改下防火墙。<br>然后是装下PHP，Nginx什么的，我是用<a href="https://oneinstack.com/" target="_blank" rel="noopener">Oneinstack</a>，可以按需安装<br>给做这个的大大点个赞。</p>
+          <!--noindex-->
+            <div class="post-button">
+              <a class="btn" href="/2016/07/13/swoole-websocket-test/#more" rel="contents">
+                Read more &raquo;
+              </a>
+            </div>
+          <!--/noindex-->
+        
       
     </div>
 
@@ -314,7 +309,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/04/15/Leetcode-No-3/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/06/22/invert-binary-tree/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -328,7 +323,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2015/04/15/Leetcode-No-3/" class="post-title-link" itemprop="url">leetcode no.3</a>
+            <a href="/2015/06/22/invert-binary-tree/" class="post-title-link" itemprop="url">invert-binary-tree</a>
         </h2>
 
         <div class="post-meta">
@@ -338,7 +333,7 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2015-04-15 13:49:00" itemprop="dateCreated datePublished" datetime="2015-04-15T13:49:00+08:00">2015-04-15</time>
+              <time title="Created: 2015-06-22 10:29:44" itemprop="dateCreated datePublished" datetime="2015-06-22T10:29:44+08:00">2015-06-22</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
@@ -358,7 +353,7 @@
             </span>
 
           
-            <span id="/2015/04/15/Leetcode-No-3/" class="post-meta-item leancloud_visitors" data-flag-title="leetcode no.3" title="Views">
+            <span id="/2015/06/22/invert-binary-tree/" class="post-meta-item leancloud_visitors" data-flag-title="invert-binary-tree" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -373,8 +368,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2015/04/15/Leetcode-No-3/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/04/15/Leetcode-No-3/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2015/06/22/invert-binary-tree/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/06/22/invert-binary-tree/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -389,15 +384,21 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <p>*<em>Longest Substring Without Repeating Characters *</em></p>
-          <!--noindex-->
-            <div class="post-button">
-              <a class="btn" href="/2015/04/15/Leetcode-No-3/#more" rel="contents">
-                Read more &raquo;
-              </a>
-            </div>
-          <!--/noindex-->
-        
+          <p><strong>Invert a binary tree</strong></p>
+<pre><code>     4
+   /   \
+  2     7
+ / \   / \
+1   3 6   9</code></pre><p>to</p>
+<pre><code>     4
+   /   \
+  7     2
+ / \   / \
+9   6 3   1</code></pre><p><strong>Trivia:</strong><br>This problem was inspired by <a href="https://twitter.com/mxcl/status/608682016205344768" target="_blank" rel="noopener">this original tweet</a> by <a href="https://twitter.com/mxcl" target="_blank" rel="noopener">Max Howell</a>:</p>
+<blockquote>
+<p>Google: 90% of our engineers use the software you wrote (Homebrew),<br>but you can’t invert a binary tree on a whiteboard so fuck off.  </p>
+</blockquote>
+<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Definition for a binary tree node.</span></span><br><span class="line"><span class="comment"> * struct TreeNode &#123;</span></span><br><span class="line"><span class="comment"> *     int val;</span></span><br><span class="line"><span class="comment"> *     TreeNode *left;</span></span><br><span class="line"><span class="comment"> *     TreeNode *right;</span></span><br><span class="line"><span class="comment"> *     TreeNode(int x) : val(x), left(NULL), right(NULL) &#123;&#125;</span></span><br><span class="line"><span class="comment"> * &#125;;</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> &#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    <span class="function">TreeNode* <span class="title">invertTree</span><span class="params">(TreeNode* root)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">if</span>(root == <span class="literal">NULL</span>) <span class="keyword">return</span> root;</span><br><span class="line">        TreeNode* temp;</span><br><span class="line">        temp = invertTree(root-&gt;left);</span><br><span class="line">        root-&gt;left = invertTree(root-&gt;right);</span><br><span class="line">        root-&gt;right = temp;</span><br><span class="line">        <span class="keyword">return</span> root;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
       
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@@ -418,7 +419,7 @@
   
   
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-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/04/14/Add-Two-Number/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/04/15/Leetcode-No-3/">
 
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@@ -432,7 +433,7 @@
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         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2015/04/14/Add-Two-Number/" class="post-title-link" itemprop="url">add-two-number</a>
+            <a href="/2015/04/15/Leetcode-No-3/" class="post-title-link" itemprop="url">leetcode no.3</a>
         </h2>
 
         <div class="post-meta">
@@ -442,14 +443,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2015-04-14 17:40:10" itemprop="dateCreated datePublished" datetime="2015-04-14T17:40:10+08:00">2015-04-14</time>
+              <time title="Created: 2015-04-15 13:49:00" itemprop="dateCreated datePublished" datetime="2015-04-15T13:49:00+08:00">2015-04-15</time>
             </span>
               <span class="post-meta-item">
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                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
+                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
               </span>
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@@ -462,7 +463,7 @@
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-            <span id="/2015/04/14/Add-Two-Number/" class="post-meta-item leancloud_visitors" data-flag-title="add-two-number" title="Views">
+            <span id="/2015/04/15/Leetcode-No-3/" class="post-meta-item leancloud_visitors" data-flag-title="leetcode no.3" title="Views">
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@@ -477,8 +478,8 @@
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-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/04/14/Add-Two-Number/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2015/04/15/Leetcode-No-3/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/04/15/Leetcode-No-3/" itemprop="commentCount"></span>
     </a>
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@@ -493,12 +494,10 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.</p>
-<p><strong>Input</strong>:<code>(2 -&gt; 4 -&gt; 3) + (5 -&gt; 6 -&gt; 4)</code><br><strong>Output</strong>: <code>7 -&gt; 0 -&gt; 8</code></p>
-<p><strong>分析（不用英文装逼了）</strong><br>这个代码是抄来的，<a href="https://github.com/haoel/leetcode" target="_blank" rel="noopener">链接</a>原作是这位大大。</p>
+          <p>*<em>Longest Substring Without Repeating Characters *</em></p>
           <!--noindex-->
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-              <a class="btn" href="/2015/04/14/Add-Two-Number/#more" rel="contents">
+              <a class="btn" href="/2015/04/15/Leetcode-No-3/#more" rel="contents">
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@@ -524,7 +523,7 @@
   
   
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-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/03/13/Reverse-Integer/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/04/14/Add-Two-Number/">
 
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-            <a href="/2015/03/13/Reverse-Integer/" class="post-title-link" itemprop="url">Reverse Integer</a>
+            <a href="/2015/04/14/Add-Two-Number/" class="post-title-link" itemprop="url">add-two-number</a>
         </h2>
 
         <div class="post-meta">
@@ -548,7 +547,7 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2015-03-13 17:22:20" itemprop="dateCreated datePublished" datetime="2015-03-13T17:22:20+08:00">2015-03-13</time>
+              <time title="Created: 2015-04-14 17:40:10" itemprop="dateCreated datePublished" datetime="2015-04-14T17:40:10+08:00">2015-04-14</time>
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-            <span id="/2015/03/13/Reverse-Integer/" class="post-meta-item leancloud_visitors" data-flag-title="Reverse Integer" title="Views">
+            <span id="/2015/04/14/Add-Two-Number/" class="post-meta-item leancloud_visitors" data-flag-title="add-two-number" title="Views">
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@@ -583,8 +582,8 @@
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-    <a title="disqus" href="/2015/03/13/Reverse-Integer/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/03/13/Reverse-Integer/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2015/04/14/Add-Two-Number/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/04/14/Add-Two-Number/" itemprop="commentCount"></span>
     </a>
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@@ -599,10 +598,12 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h3 id="Reverse-Integer"><a href="#Reverse-Integer" class="headerlink" title="Reverse Integer"></a><a href="https://leetcode.com/problems/reverse-integer/" target="_blank" rel="noopener">Reverse Integer</a></h3><h4 id="Reverse-digits-of-an-integer"><a href="#Reverse-digits-of-an-integer" class="headerlink" title="Reverse digits of an integer."></a>Reverse digits of an integer.</h4><p>Example1: x = 123, return 321<br>Example2: x = -123, return -321</p>
+          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.</p>
+<p><strong>Input</strong>:<code>(2 -&gt; 4 -&gt; 3) + (5 -&gt; 6 -&gt; 4)</code><br><strong>Output</strong>: <code>7 -&gt; 0 -&gt; 8</code></p>
+<p><strong>分析（不用英文装逼了）</strong><br>这个代码是抄来的，<a href="https://github.com/haoel/leetcode" target="_blank" rel="noopener">链接</a>原作是这位大大。</p>
           <!--noindex-->
             <div class="post-button">
-              <a class="btn" href="/2015/03/13/Reverse-Integer/#more" rel="contents">
+              <a class="btn" href="/2015/04/14/Add-Two-Number/#more" rel="contents">
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               </a>
             </div>
@@ -628,7 +629,7 @@
   
   
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-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/03/11/Reverse-Bits/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/03/13/Reverse-Integer/">
 
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-            <a href="/2015/03/11/Reverse-Bits/" class="post-title-link" itemprop="url">Reverse Bits</a>
+            <a href="/2015/03/13/Reverse-Integer/" class="post-title-link" itemprop="url">Reverse Integer</a>
         </h2>
 
         <div class="post-meta">
@@ -652,7 +653,7 @@
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               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2015-03-11 17:35:20" itemprop="dateCreated datePublished" datetime="2015-03-11T17:35:20+08:00">2015-03-11</time>
+              <time title="Created: 2015-03-13 17:22:20" itemprop="dateCreated datePublished" datetime="2015-03-13T17:22:20+08:00">2015-03-13</time>
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-            <span id="/2015/03/11/Reverse-Bits/" class="post-meta-item leancloud_visitors" data-flag-title="Reverse Bits" title="Views">
+            <span id="/2015/03/13/Reverse-Integer/" class="post-meta-item leancloud_visitors" data-flag-title="Reverse Integer" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
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@@ -687,8 +688,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2015/03/11/Reverse-Bits/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/03/11/Reverse-Bits/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2015/03/13/Reverse-Integer/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/03/13/Reverse-Integer/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -703,10 +704,10 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h3 id="Reverse-Bits"><a href="#Reverse-Bits" class="headerlink" title="Reverse Bits "></a><a href="https://leetcode.com/problems/reverse-bits/" target="_blank" rel="noopener">Reverse Bits </a></h3><h4 id="Reverse-bits-of-a-given-32-bits-unsigned-integer"><a href="#Reverse-bits-of-a-given-32-bits-unsigned-integer" class="headerlink" title="Reverse bits of a given 32 bits unsigned integer."></a>Reverse bits of a given 32 bits unsigned integer.</h4><p>For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return 964176192 (represented in binary as 00111001011110000010100101000000).</p>
+          <h3 id="Reverse-Integer"><a href="#Reverse-Integer" class="headerlink" title="Reverse Integer"></a><a href="https://leetcode.com/problems/reverse-integer/" target="_blank" rel="noopener">Reverse Integer</a></h3><h4 id="Reverse-digits-of-an-integer"><a href="#Reverse-digits-of-an-integer" class="headerlink" title="Reverse digits of an integer."></a>Reverse digits of an integer.</h4><p>Example1: x = 123, return 321<br>Example2: x = -123, return -321</p>
           <!--noindex-->
             <div class="post-button">
-              <a class="btn" href="/2015/03/11/Reverse-Bits/#more" rel="contents">
+              <a class="btn" href="/2015/03/13/Reverse-Integer/#more" rel="contents">
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               </a>
             </div>
@@ -799,7 +800,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -874,7 +875,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/page/16/index.html b/page/16/index.html
index 56a93a9dd2..242bb87dec 100644
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+++ b/page/16/index.html
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-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/03/11/Number-Of-1-Bits/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/03/11/Reverse-Bits/">
 
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@@ -218,7 +218,7 @@
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         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2015/03/11/Number-Of-1-Bits/" class="post-title-link" itemprop="url">Number of 1 Bits</a>
+            <a href="/2015/03/11/Reverse-Bits/" class="post-title-link" itemprop="url">Reverse Bits</a>
         </h2>
 
         <div class="post-meta">
@@ -228,14 +228,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2015-03-11 17:02:58" itemprop="dateCreated datePublished" datetime="2015-03-11T17:02:58+08:00">2015-03-11</time>
+              <time title="Created: 2015-03-11 17:35:20" itemprop="dateCreated datePublished" datetime="2015-03-11T17:35:20+08:00">2015-03-11</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
+                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
               </span>
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@@ -248,7 +248,7 @@
             </span>
 
           
-            <span id="/2015/03/11/Number-Of-1-Bits/" class="post-meta-item leancloud_visitors" data-flag-title="Number of 1 Bits" title="Views">
+            <span id="/2015/03/11/Reverse-Bits/" class="post-meta-item leancloud_visitors" data-flag-title="Reverse Bits" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
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@@ -263,8 +263,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2015/03/11/Number-Of-1-Bits/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/03/11/Number-Of-1-Bits/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2015/03/11/Reverse-Bits/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/03/11/Reverse-Bits/" itemprop="commentCount"></span>
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@@ -279,10 +279,10 @@
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-          <h3 id="Number-of-1-Bits"><a href="#Number-of-1-Bits" class="headerlink" title="Number of 1 Bits "></a><a href="https://leetcode.com/problems/number-of-1-bits/" target="_blank" rel="noopener">Number of 1 Bits </a></h3><h4 id="Write-a-function-that-takes-an-unsigned-integer-and-returns-the-number-of-’1’-bits-it-has-also-known-as-the-Hamming-weight-For-example-the-32-bit-integer-‘11’-has-binary-representation-00000000000000000000000000001011-so-the-function-should-return-3"><a href="#Write-a-function-that-takes-an-unsigned-integer-and-returns-the-number-of-’1’-bits-it-has-also-known-as-the-Hamming-weight-For-example-the-32-bit-integer-‘11’-has-binary-representation-00000000000000000000000000001011-so-the-function-should-return-3" class="headerlink" title="Write a function that takes an unsigned integer and returns the number of ’1’ bits it has (also known as the Hamming weight). For example, the 32-bit integer ‘11’ has binary representation  00000000000000000000000000001011, so the function should return 3."></a>Write a function that takes an unsigned integer and returns the number of ’1’ bits it has (also known as the Hamming weight). For example, the 32-bit integer ‘11’ has binary representation  <code>00000000000000000000000000001011</code>, so the function should return 3.</h4>
+          <h3 id="Reverse-Bits"><a href="#Reverse-Bits" class="headerlink" title="Reverse Bits "></a><a href="https://leetcode.com/problems/reverse-bits/" target="_blank" rel="noopener">Reverse Bits </a></h3><h4 id="Reverse-bits-of-a-given-32-bits-unsigned-integer"><a href="#Reverse-bits-of-a-given-32-bits-unsigned-integer" class="headerlink" title="Reverse bits of a given 32 bits unsigned integer."></a>Reverse bits of a given 32 bits unsigned integer.</h4><p>For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return 964176192 (represented in binary as 00111001011110000010100101000000).</p>
           <!--noindex-->
             <div class="post-button">
-              <a class="btn" href="/2015/03/11/Number-Of-1-Bits/#more" rel="contents">
+              <a class="btn" href="/2015/03/11/Reverse-Bits/#more" rel="contents">
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               </a>
             </div>
@@ -308,7 +308,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/01/16/pcre-intro-and-a-simple-package/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/03/11/Number-Of-1-Bits/">
 
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@@ -322,7 +322,7 @@
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-            <a href="/2015/01/16/pcre-intro-and-a-simple-package/" class="post-title-link" itemprop="url">pcre-intro-and-a-simple-package</a>
+            <a href="/2015/03/11/Number-Of-1-Bits/" class="post-title-link" itemprop="url">Number of 1 Bits</a>
         </h2>
 
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@@ -332,7 +332,7 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2015-01-16 14:30:20" itemprop="dateCreated datePublished" datetime="2015-01-16T14:30:20+08:00">2015-01-16</time>
+              <time title="Created: 2015-03-11 17:02:58" itemprop="dateCreated datePublished" datetime="2015-03-11T17:02:58+08:00">2015-03-11</time>
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@@ -347,12 +347,12 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/C/" itemprop="url" rel="index"><span itemprop="name">C++</span></a>
+                  <a href="/categories/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a>
                 </span>
             </span>
 
           
-            <span id="/2015/01/16/pcre-intro-and-a-simple-package/" class="post-meta-item leancloud_visitors" data-flag-title="pcre-intro-and-a-simple-package" title="Views">
+            <span id="/2015/03/11/Number-Of-1-Bits/" class="post-meta-item leancloud_visitors" data-flag-title="Number of 1 Bits" title="Views">
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                 <i class="fa fa-eye"></i>
               </span>
@@ -367,8 +367,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2015/01/16/pcre-intro-and-a-simple-package/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/01/16/pcre-intro-and-a-simple-package/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2015/03/11/Number-Of-1-Bits/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/03/11/Number-Of-1-Bits/" itemprop="commentCount"></span>
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@@ -383,13 +383,10 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h3 id="Pcre"><a href="#Pcre" class="headerlink" title="Pcre"></a><a href="http://www.pcre.org/" target="_blank" rel="noopener">Pcre</a></h3><blockquote>
-<p>Perl Compatible Regular Expressions (PCRE) is a regular<br> expression C library inspired by the regular expression<br> capabilities in the Perl programming language, written<br> by Philip Hazel, starting in summer 1997.</p>
-</blockquote>
-<p>因为最近工作内容的一部分需要做字符串的识别处理，所以就顺便用上了之前在PHP中用过的正则，在C/C++中本身不包含正则库，这里使用的pcre，对MFC开发，在<a href="http://www.psyon.org/projects/pcre-win32/index.php" target="_blank" rel="noopener">这里</a>提供了静态链接库，在引入lib跟.h文件后即可使用。</p>
+          <h3 id="Number-of-1-Bits"><a href="#Number-of-1-Bits" class="headerlink" title="Number of 1 Bits "></a><a href="https://leetcode.com/problems/number-of-1-bits/" target="_blank" rel="noopener">Number of 1 Bits </a></h3><h4 id="Write-a-function-that-takes-an-unsigned-integer-and-returns-the-number-of-’1’-bits-it-has-also-known-as-the-Hamming-weight-For-example-the-32-bit-integer-‘11’-has-binary-representation-00000000000000000000000000001011-so-the-function-should-return-3"><a href="#Write-a-function-that-takes-an-unsigned-integer-and-returns-the-number-of-’1’-bits-it-has-also-known-as-the-Hamming-weight-For-example-the-32-bit-integer-‘11’-has-binary-representation-00000000000000000000000000001011-so-the-function-should-return-3" class="headerlink" title="Write a function that takes an unsigned integer and returns the number of ’1’ bits it has (also known as the Hamming weight). For example, the 32-bit integer ‘11’ has binary representation  00000000000000000000000000001011, so the function should return 3."></a>Write a function that takes an unsigned integer and returns the number of ’1’ bits it has (also known as the Hamming weight). For example, the 32-bit integer ‘11’ has binary representation  <code>00000000000000000000000000001011</code>, so the function should return 3.</h4>
           <!--noindex-->
             <div class="post-button">
-              <a class="btn" href="/2015/01/16/pcre-intro-and-a-simple-package/#more" rel="contents">
+              <a class="btn" href="/2015/03/11/Number-Of-1-Bits/#more" rel="contents">
                 Read more &raquo;
               </a>
             </div>
@@ -415,7 +412,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/01/14/Two-Sum/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/01/16/pcre-intro-and-a-simple-package/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -429,7 +426,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2015/01/14/Two-Sum/" class="post-title-link" itemprop="url">two sum</a>
+            <a href="/2015/01/16/pcre-intro-and-a-simple-package/" class="post-title-link" itemprop="url">pcre-intro-and-a-simple-package</a>
         </h2>
 
         <div class="post-meta">
@@ -439,14 +436,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2015-01-14 15:39:31" itemprop="dateCreated datePublished" datetime="2015-01-14T15:39:31+08:00">2015-01-14</time>
+              <time title="Created: 2015-01-16 14:30:20" itemprop="dateCreated datePublished" datetime="2015-01-16T14:30:20+08:00">2015-01-16</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
+                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
               </span>
             <span class="post-meta-item">
               <span class="post-meta-item-icon">
@@ -454,12 +451,12 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a>
+                  <a href="/categories/C/" itemprop="url" rel="index"><span itemprop="name">C++</span></a>
                 </span>
             </span>
 
           
-            <span id="/2015/01/14/Two-Sum/" class="post-meta-item leancloud_visitors" data-flag-title="two sum" title="Views">
+            <span id="/2015/01/16/pcre-intro-and-a-simple-package/" class="post-meta-item leancloud_visitors" data-flag-title="pcre-intro-and-a-simple-package" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -474,8 +471,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2015/01/14/Two-Sum/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/01/14/Two-Sum/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2015/01/16/pcre-intro-and-a-simple-package/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/01/16/pcre-intro-and-a-simple-package/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -490,11 +487,13 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>Given an array of integers, find two numbers such that they add up to a specific target number.</p>
-<p>The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2. Please note that your returned answers (both index1 and index2) are not zero-based.</p>
+          <h3 id="Pcre"><a href="#Pcre" class="headerlink" title="Pcre"></a><a href="http://www.pcre.org/" target="_blank" rel="noopener">Pcre</a></h3><blockquote>
+<p>Perl Compatible Regular Expressions (PCRE) is a regular<br> expression C library inspired by the regular expression<br> capabilities in the Perl programming language, written<br> by Philip Hazel, starting in summer 1997.</p>
+</blockquote>
+<p>因为最近工作内容的一部分需要做字符串的识别处理，所以就顺便用上了之前在PHP中用过的正则，在C/C++中本身不包含正则库，这里使用的pcre，对MFC开发，在<a href="http://www.psyon.org/projects/pcre-win32/index.php" target="_blank" rel="noopener">这里</a>提供了静态链接库，在引入lib跟.h文件后即可使用。</p>
           <!--noindex-->
             <div class="post-button">
-              <a class="btn" href="/2015/01/14/Two-Sum/#more" rel="contents">
+              <a class="btn" href="/2015/01/16/pcre-intro-and-a-simple-package/#more" rel="contents">
                 Read more &raquo;
               </a>
             </div>
@@ -520,7 +519,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/01/04/Path-Sum/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/01/14/Two-Sum/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -534,7 +533,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2015/01/04/Path-Sum/" class="post-title-link" itemprop="url">Path Sum</a>
+            <a href="/2015/01/14/Two-Sum/" class="post-title-link" itemprop="url">two sum</a>
         </h2>
 
         <div class="post-meta">
@@ -544,14 +543,14 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2015-01-04 15:44:10" itemprop="dateCreated datePublished" datetime="2015-01-04T15:44:10+08:00">2015-01-04</time>
+              <time title="Created: 2015-01-14 15:39:31" itemprop="dateCreated datePublished" datetime="2015-01-14T15:39:31+08:00">2015-01-14</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
                   <i class="far fa-calendar-check"></i>
                 </span>
                 <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
+                <time title="Modified: 2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time>
               </span>
             <span class="post-meta-item">
               <span class="post-meta-item-icon">
@@ -564,7 +563,7 @@
             </span>
 
           
-            <span id="/2015/01/04/Path-Sum/" class="post-meta-item leancloud_visitors" data-flag-title="Path Sum" title="Views">
+            <span id="/2015/01/14/Two-Sum/" class="post-meta-item leancloud_visitors" data-flag-title="two sum" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -579,8 +578,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2015/01/04/Path-Sum/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/01/04/Path-Sum/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2015/01/14/Two-Sum/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/01/14/Two-Sum/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -595,10 +594,11 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum.</p>
+          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>Given an array of integers, find two numbers such that they add up to a specific target number.</p>
+<p>The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2. Please note that your returned answers (both index1 and index2) are not zero-based.</p>
           <!--noindex-->
             <div class="post-button">
-              <a class="btn" href="/2015/01/04/Path-Sum/#more" rel="contents">
+              <a class="btn" href="/2015/01/14/Two-Sum/#more" rel="contents">
                 Read more &raquo;
               </a>
             </div>
@@ -624,7 +624,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2014/12/30/Clone-Graph-Part-I/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2015/01/04/Path-Sum/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -638,7 +638,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2014/12/30/Clone-Graph-Part-I/" class="post-title-link" itemprop="url">Clone Graph Part I</a>
+            <a href="/2015/01/04/Path-Sum/" class="post-title-link" itemprop="url">Path Sum</a>
         </h2>
 
         <div class="post-meta">
@@ -648,7 +648,7 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2014-12-30 16:50:01" itemprop="dateCreated datePublished" datetime="2014-12-30T16:50:01+08:00">2014-12-30</time>
+              <time title="Created: 2015-01-04 15:44:10" itemprop="dateCreated datePublished" datetime="2015-01-04T15:44:10+08:00">2015-01-04</time>
             </span>
               <span class="post-meta-item">
                 <span class="post-meta-item-icon">
@@ -668,7 +668,7 @@
             </span>
 
           
-            <span id="/2014/12/30/Clone-Graph-Part-I/" class="post-meta-item leancloud_visitors" data-flag-title="Clone Graph Part I" title="Views">
+            <span id="/2015/01/04/Path-Sum/" class="post-meta-item leancloud_visitors" data-flag-title="Path Sum" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -683,8 +683,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2014/12/30/Clone-Graph-Part-I/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2014/12/30/Clone-Graph-Part-I/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2015/01/04/Path-Sum/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2015/01/04/Path-Sum/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -699,10 +699,10 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">Clone a graph. Input is a Node pointer. Return the Node pointer of the cloned graph.</span><br><span class="line"></span><br><span class="line">A graph is defined below:</span><br><span class="line">struct Node &#123;</span><br><span class="line">vector neighbors;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum.</p>
           <!--noindex-->
             <div class="post-button">
-              <a class="btn" href="/2014/12/30/Clone-Graph-Part-I/#more" rel="contents">
+              <a class="btn" href="/2015/01/04/Path-Sum/#more" rel="contents">
                 Read more &raquo;
               </a>
             </div>
@@ -795,7 +795,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -870,7 +870,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/page/17/index.html b/page/17/index.html
index ef3e49158c..0f7b328d13 100644
--- a/page/17/index.html
+++ b/page/17/index.html
@@ -203,6 +203,110 @@
       
   
   
+  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2014/12/30/Clone-Graph-Part-I/">
+
+    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
+      <meta itemprop="image" content="/uploads/avatar.jpg">
+      <meta itemprop="name" content="Nicksxs">
+      <meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森">
+    </span>
+
+    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
+      <meta itemprop="name" content="Nicksxs's Blog">
+    </span>
+      <header class="post-header">
+        <h2 class="post-title" itemprop="name headline">
+          
+            <a href="/2014/12/30/Clone-Graph-Part-I/" class="post-title-link" itemprop="url">Clone Graph Part I</a>
+        </h2>
+
+        <div class="post-meta">
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
+                <i class="far fa-calendar"></i>
+              </span>
+              <span class="post-meta-item-text">Posted on</span>
+
+              <time title="Created: 2014-12-30 16:50:01" itemprop="dateCreated datePublished" datetime="2014-12-30T16:50:01+08:00">2014-12-30</time>
+            </span>
+              <span class="post-meta-item">
+                <span class="post-meta-item-icon">
+                  <i class="far fa-calendar-check"></i>
+                </span>
+                <span class="post-meta-item-text">Edited on</span>
+                <time title="Modified: 2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time>
+              </span>
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
+                <i class="far fa-folder"></i>
+              </span>
+              <span class="post-meta-item-text">In</span>
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a>
+                </span>
+            </span>
+
+          
+            <span id="/2014/12/30/Clone-Graph-Part-I/" class="post-meta-item leancloud_visitors" data-flag-title="Clone Graph Part I" title="Views">
+              <span class="post-meta-item-icon">
+                <i class="fa fa-eye"></i>
+              </span>
+              <span class="post-meta-item-text">Views: </span>
+              <span class="leancloud-visitors-count"></span>
+            </span>
+  
+  <span class="post-meta-item">
+    
+      <span class="post-meta-item-icon">
+        <i class="far fa-comment"></i>
+      </span>
+      <span class="post-meta-item-text">Disqus: </span>
+    
+    <a title="disqus" href="/2014/12/30/Clone-Graph-Part-I/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2014/12/30/Clone-Graph-Part-I/" itemprop="commentCount"></span>
+    </a>
+  </span>
+  
+  
+
+        </div>
+      </header>
+
+    
+    
+    
+    <div class="post-body" itemprop="articleBody">
+
+      
+          <h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">Clone a graph. Input is a Node pointer. Return the Node pointer of the cloned graph.</span><br><span class="line"></span><br><span class="line">A graph is defined below:</span><br><span class="line">struct Node &#123;</span><br><span class="line">vector neighbors;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+          <!--noindex-->
+            <div class="post-button">
+              <a class="btn" href="/2014/12/30/Clone-Graph-Part-I/#more" rel="contents">
+                Read more &raquo;
+              </a>
+            </div>
+          <!--/noindex-->
+        
+      
+    </div>
+
+    
+    
+    
+      
+
+      <footer class="post-footer">
+        <div class="post-eof"></div>
+      </footer>
+  </article>
+  
+  
+  
+
+      
+  
+  
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
     <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2014/12/24/MFC%20%E6%A8%A1%E6%80%81%E5%AF%B9%E8%AF%9D%E6%A1%86/">
 
@@ -468,7 +572,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -543,7 +647,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/page/2/index.html b/page/2/index.html
index 36eaa3d8b8..9a4f54c960 100644
--- a/page/2/index.html
+++ b/page/2/index.html
@@ -203,6 +203,108 @@
       
   
   
+  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/11/29/%E4%BB%8E%E6%B8%85%E5%8D%8E%E7%BE%8E%E9%99%A2%E5%AD%A6%E5%A7%90%E8%81%8A%E8%81%8A%E6%88%91%E4%BB%AC%E8%BA%AB%E8%BE%B9%E7%9A%84%E6%81%B6%E4%BA%BA/">
+
+    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
+      <meta itemprop="image" content="/uploads/avatar.jpg">
+      <meta itemprop="name" content="Nicksxs">
+      <meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森">
+    </span>
+
+    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
+      <meta itemprop="name" content="Nicksxs's Blog">
+    </span>
+      <header class="post-header">
+        <h2 class="post-title" itemprop="name headline">
+          
+            <a href="/2020/11/29/%E4%BB%8E%E6%B8%85%E5%8D%8E%E7%BE%8E%E9%99%A2%E5%AD%A6%E5%A7%90%E8%81%8A%E8%81%8A%E6%88%91%E4%BB%AC%E8%BA%AB%E8%BE%B9%E7%9A%84%E6%81%B6%E4%BA%BA/" class="post-title-link" itemprop="url">从清华美院学姐聊聊我们身边的恶人</a>
+        </h2>
+
+        <div class="post-meta">
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
+                <i class="far fa-calendar"></i>
+              </span>
+              <span class="post-meta-item-text">Posted on</span>
+
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+          <p>前几天清华美院学姐的热点火了，然后仔细看了下，其实是个学姐诬陷以为其貌不扬的男同学摸她屁股<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/ZovTIK.jpg" alt=""><br>然后还在朋友圈发文想让他社死，我也是挺晚才知道这个词什么意思，然后后面我看到了这个图片，挺有意思的<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/%E6%91%B8%E5%B1%81%E8%82%A1.png" alt=""><br>本来其实也没什么想聊这个的，是在 B 站看了个吐槽这个的，然后刚好晚上乘公交的时候又碰到了有点类似的问题<br>故事描述下，我们从始发站做了公交，这辆公交司机上次碰到过一回，就是会比较关注乘客的佩戴情况，主要考虑到目前国内疫情，然后这次在差不多人都坐满的情况下，可能在提示了三次让车内乘客戴好口罩，但是他指的那个中年女性还是没有反应，司机就转头比较大声指着这个乘客（中年女性）让戴好口罩，然后这个乘客（中年女性）就大声的说“我口罩是滑下来了，你指着我干嘛，你态度这么差，要吃了我一样，我要投诉你”等等，然后可能跟她一块的一个中年女性也是这么帮腔指责司机，比较基本的理解，车子里这么多乘客，假如是处于这位乘客口罩滑下来了而不自知的情况下，司机在提示了三次以后回头指着她说，我想的是没什么问题的，但是这位却反而指责这位司机指着她，并且说是态度差，要吃了她，完全是不可理喻的，并且一直喋喋不休说她口罩滑掉了有什么错，要投诉这个司机，让他可以提前退休了，在其他乘客的劝说下司机准备继续开车时，又口吐芬芳“你个傻<em>，你来打我呀”，真的是让我再次体会到了所谓的恶人先告状的又一完美呈现，后面还有个乘客还是表示要打死司机这个傻</em>，让我有点不明所以，俗话说有人是得理不饶人，前提是得理，这种理亏不饶人真的是挺让人长见识的，试想下，司机在提示三次后，这位乘客还是没有把口罩戴好，如何在不指着这位乘客的情况下能准确的提示到她呢，并且觉得语气态度不好，司机要载着一车的人，因为你这一个乘客不戴好口罩而不能正常出发，有些着急应该很正常吧，可能是平时自己在家里耀武扬威的使唤别人习惯了吧，别人不敢这么大声跟她说话，其实想想这位中年女性应该年纪不会很大，还比较时髦的吧，像一些常见的中年杭州本地人可能是不会说傻*这个词的吧。<br>杭州的公交可能是在二月份疫情还比较严重的时候是要求上车出示健康码，后面比较缓和以后只要求佩戴好口罩，但是在我们小绍兴，目前还是一律要求检验健康码和佩戴口罩，对于疫情中，并且目前阶段国内也时有报出小范围的疫情的情况下，司机尽职要求佩戴好口罩其实也是为了乘客着想，另一种情况如果司机不严格要求，万一车上有个感染者，这位中年女性被传染了，如果能找到这个司机的话，是不是想“打死”这个司机，竟然让感染者上了车，反正她自己是不可能有错的，上来就是对方态度差，要投诉，自己不戴好口罩啥都没错，我就想知道如果因为自己没戴好口罩被感染了，是不是也是司机的错，毕竟没有像仆人那样点头哈腰求着她戴好口罩。<br>再说回来，整个车就她一个人没戴好口罩，并且还有个细节，其实这个乘客是上了车之后就没戴好了，本来上车的时候是戴好的，这种比较有可能是觉得上车的时候司机那看一眼就好了，如果好好戴着口罩，一点事情都没有，唉，纯粹是太气愤了，调理逻辑什么的就忽略吧</p>
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-          <h2 id="题目介绍"><a href="#题目介绍" class="headerlink" title="题目介绍"></a>题目介绍</h2><p>给定一个二叉树，找出其最大深度。</p>
-<p>二叉树的深度为根节点到最远叶子节点的最长路径上的节点数。</p>
-<p>说明: 叶子节点是指没有子节点的节点。</p>
-<p>示例：<br>给定二叉树 [3,9,20,null,null,15,7]，</p>
-<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">  3</span><br><span class="line"> &#x2F; \</span><br><span class="line">9  20</span><br><span class="line">  &#x2F;  \</span><br><span class="line"> 15   7</span><br></pre></td></tr></table></figure>
-<p>返回它的最大深度 3 。</p>
-<h2 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 主体是个递归的应用</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">maxDepth</span><span class="params">(TreeNode root)</span> </span>&#123;</span><br><span class="line">    <span class="comment">// 节点的退出条件之一</span></span><br><span class="line">    <span class="keyword">if</span> (root == <span class="keyword">null</span>) &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">int</span> left = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">int</span> right = <span class="number">0</span>;</span><br><span class="line">    <span class="comment">// 存在左子树，就递归左子树</span></span><br><span class="line">    <span class="keyword">if</span> (root.left != <span class="keyword">null</span>) &#123;</span><br><span class="line">        left = maxDepth(root.left);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">// 存在右子树，就递归右子树</span></span><br><span class="line">    <span class="keyword">if</span> (root.right != <span class="keyword">null</span>) &#123;</span><br><span class="line">        right = maxDepth(root.right);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">// 前面返回后，左右取大者</span></span><br><span class="line">    <span class="keyword">return</span> Math.max(left + <span class="number">1</span>, right + <span class="number">1</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<h2 id="分析"><a href="#分析" class="headerlink" title="分析"></a>分析</h2><p>其实对于树这类题，一般是以递归形式比较方便，只是要注意退出条件</p>
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-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/" itemprop="url" rel="index"><span itemprop="name">跑步</span></a>
+                  <a href="/categories/Binary-Tree/" itemprop="url" rel="index"><span itemprop="name">Binary Tree</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/%E5%B9%B2%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">干活</span></a>
+                  <a href="/categories/leetcode/java/" itemprop="url" rel="index"><span itemprop="name">java</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/leetcode/java/Binary-Tree/" itemprop="url" rel="index"><span itemprop="name">Binary Tree</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/leetcode/java/Binary-Tree/DFS/" itemprop="url" rel="index"><span itemprop="name">DFS</span></a>
                 </span>
             </span>
 
           
-            <span id="/2020/10/18/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E4%BA%94/" class="post-meta-item leancloud_visitors" data-flag-title="在老丈人家的小工记五" title="Views">
+            <span id="/2020/10/25/Leetcode-104-%E4%BA%8C%E5%8F%89%E6%A0%91%E7%9A%84%E6%9C%80%E5%A4%A7%E6%B7%B1%E5%BA%A6-Maximum-Depth-of-Binary-Tree-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-meta-item leancloud_visitors" data-flag-title="Leetcode 104 二叉树的最大深度(Maximum Depth of Binary Tree) 题解分析" title="Views">
               <span class="post-meta-item-icon">
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@@ -269,8 +276,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2020/10/18/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E4%BA%94/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/10/18/在老丈人家的小工记五/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/10/25/Leetcode-104-%E4%BA%8C%E5%8F%89%E6%A0%91%E7%9A%84%E6%9C%80%E5%A4%A7%E6%B7%B1%E5%BA%A6-Maximum-Depth-of-Binary-Tree-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/10/25/Leetcode-104-二叉树的最大深度-Maximum-Depth-of-Binary-Tree-题解分析/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -285,7 +292,14 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <p>终于回忆起来了，年纪大了写这种东西真的要立马写，不然很容易想不起来，那天应该是 9 月 12 日，也就是上周六，因为我爸也去了，而且娘亲（丈母娘，LD 这么叫，我也就随了她这么叫，当然是背后，当面就叫妈）也在那，早上一到那二爹就给我爸指挥了活，要挖一条院子的出水道，自己想出来的词，因为觉得下水道是竖的，在那稍稍帮了一会会忙，然后我还是比较惯例的跟着 LD 还有娘亲去住的家里，主要是老丈人可能也不太想让我干太累的活，因为上次已经差不多把三楼都整理干净了，然后就是二楼了，二楼说实话我也帮不上什么忙，主要是衣服被子什么的，正好是有张以前小孩子睡过的那种摇篮床，看上去虽然有一些破损，整体还是不错的，所以打算拿过去，我就负责把它拆掉了，比较简单的是只要拧螺丝就行了，但是其实是用了好多好多工具才搞定的，一开始只要螺丝刀就行了，但是因为年代久了，后面的螺帽也有点锈住或者本身就会串着会一起动，所以拿来了个扳手，大部分的其实都被这两个工具给搞定了，但是后期大概还剩下四分之一的时候，有一颗完全锈住，并且螺纹跟之前那些都不一样，但是这个已经是最大的螺丝刀了，也没办法换个大的了，所以又去找来个一字的，因为十字的不是也可以用一字的拧嘛，结果可能是我买的工具箱里的一字螺丝刀太新了，口子那很锋利，直接把螺丝花纹给划掉了，大的小的都划掉，然后真的变成凹进去一个圆柱体了，然后就想能不能隔一层布去拧，然而因为的确是已经变成圆柱体了，布也不太给力，不放弃的我又去找来了个老虎钳，妄图把划掉的螺丝用老虎钳钳住，另一端用扳手拧开螺帽，但是这个螺丝跟螺帽真的是生锈的太严重了，外加上钳不太牢，完全是两边一起转，实在是没办法了，在征得同意之后，直接掰断了，火死了，一颗螺丝折腾得比我拆一张床还久，那天因为早上去的也比较晚了，然后就快吃午饭了，正好想着带一点东西过去，就把一些脸盆，泡脚桶啥的拿过去了，先是去吃了饭，还是在那家快餐店，菜的口味还是依然不错，就是人比较多，我爸旁边都是素菜，都没怎么吃远一点的荤菜，下次要早点去，把荤菜放我爸旁边😄（PS：他们家饭还是依然尴尬，需要等），吃完就开到在修的房子那把东西拿了出来，我爸已经动作很快的打了一小半的地沟了，说实话那玩意真的是很重，我之前把它从三楼拿下来，就觉得这个太重了，这次还要用起来，感觉我的手会分分钟废掉，不过一开始我还是跟着LD去了住的家里，惯例睡了午觉，那天睡得比较踏实，竟然睡了一个小时，醒了想了下，其实LD她们收拾也用不上我（没啥力气活），我还是去帮我爸他们，跟LD说了下就去了在修的老房子那，两位老爹在一起钻地，看着就很累，我连忙上去想换一会他们，因为刚好是钻到混凝土地线，特别难，力道不够就会滑开，用蛮力就是钻进去拔不出来，原理是因为本身浇的时候就是很紧实的，需要边钻边动，那家伙实在是太重了，真的是汗如雨下，基本是三个人轮流来，我是个添乱的，经常卡住，然后把地线，其实就是一条混凝土横梁，里面还有14跟18的钢筋，需要割断，这个割断也是很有技巧，钢筋本身在里面是受到挤压的，直接用切割的，到快断掉的时候就会崩一下，非常危险，还是老丈人比较有经验，要留一点点，然后直接用榔头敲断就好了，本来以为这个是最难的了，结果下面是一块非常大的青基石，而且也是石头跟石头挤一块，边上一点点打钻有点杯水车薪，后来是用那种螺旋的钻，钻四个洞，相对位置大概是个长方形，这样子把中间这个长方形钻出来就比较容易地能拿出来了，后面的也容易搞出来了，后面的其实难度不是特别大了，主要是地沟打好之后得看看高低是不是符合要求的，不能本来是往外排水的反而外面高，这个怎么看就又很有技巧了，一般在地上的只要侧着看一下就好了，考究点就用下水平尺，但是在地下的，不用水平尺，其实可以借助于地沟里正要放进去的水管，放点水进去，看水往哪流就行了，铺好水管后，就剩填埋的活了，不是太麻烦了，那天真的是累到了，打那个混凝土的时候我真的是把我整个人压上去了，不过也挺爽的，有点把平时无处发泄的蛮力发泄出去了。</p>
+          <h2 id="题目介绍"><a href="#题目介绍" class="headerlink" title="题目介绍"></a>题目介绍</h2><p>给定一个二叉树，找出其最大深度。</p>
+<p>二叉树的深度为根节点到最远叶子节点的最长路径上的节点数。</p>
+<p>说明: 叶子节点是指没有子节点的节点。</p>
+<p>示例：<br>给定二叉树 [3,9,20,null,null,15,7]，</p>
+<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">  3</span><br><span class="line"> &#x2F; \</span><br><span class="line">9  20</span><br><span class="line">  &#x2F;  \</span><br><span class="line"> 15   7</span><br></pre></td></tr></table></figure>
+<p>返回它的最大深度 3 。</p>
+<h2 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 主体是个递归的应用</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">maxDepth</span><span class="params">(TreeNode root)</span> </span>&#123;</span><br><span class="line">    <span class="comment">// 节点的退出条件之一</span></span><br><span class="line">    <span class="keyword">if</span> (root == <span class="keyword">null</span>) &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">int</span> left = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">int</span> right = <span class="number">0</span>;</span><br><span class="line">    <span class="comment">// 存在左子树，就递归左子树</span></span><br><span class="line">    <span class="keyword">if</span> (root.left != <span class="keyword">null</span>) &#123;</span><br><span class="line">        left = maxDepth(root.left);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">// 存在右子树，就递归右子树</span></span><br><span class="line">    <span class="keyword">if</span> (root.right != <span class="keyword">null</span>) &#123;</span><br><span class="line">        right = maxDepth(root.right);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">// 前面返回后，左右取大者</span></span><br><span class="line">    <span class="keyword">return</span> Math.max(left + <span class="number">1</span>, right + <span class="number">1</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<h2 id="分析"><a href="#分析" class="headerlink" title="分析"></a>分析</h2><p>其实对于树这类题，一般是以递归形式比较方便，只是要注意退出条件</p>
 
       
     </div>
@@ -307,7 +321,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/10/11/Leetcode-2-Add-Two-Numbers-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/10/18/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E4%BA%94/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -321,7 +335,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2020/10/11/Leetcode-2-Add-Two-Numbers-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-title-link" itemprop="url">Leetcode 2 Add Two Numbers 题解分析</a>
+            <a href="/2020/10/18/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E4%BA%94/" class="post-title-link" itemprop="url">在老丈人家的小工记五</a>
         </h2>
 
         <div class="post-meta">
@@ -332,7 +346,7 @@
               <span class="post-meta-item-text">Posted on</span>
               
 
-              <time title="Created: 2020-10-11 23:22:45 / Modified: 23:23:51" itemprop="dateCreated datePublished" datetime="2020-10-11T23:22:45+08:00">2020-10-11</time>
+              <time title="Created: 2020-10-18 23:14:52 / Modified: 23:15:50" itemprop="dateCreated datePublished" datetime="2020-10-18T23:14:52+08:00">2020-10-18</time>
             </span>
             <span class="post-meta-item">
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@@ -340,28 +354,24 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/linked-list/" itemprop="url" rel="index"><span itemprop="name">linked list</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/" itemprop="url" rel="index"><span itemprop="name">运动</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/leetcode/java/" itemprop="url" rel="index"><span itemprop="name">java</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/" itemprop="url" rel="index"><span itemprop="name">跑步</span></a>
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                   , 
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-                  <a href="/categories/leetcode/java/linked-list/" itemprop="url" rel="index"><span itemprop="name">linked list</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/%E5%B9%B2%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">干活</span></a>
                 </span>
             </span>
 
           
-            <span id="/2020/10/11/Leetcode-2-Add-Two-Numbers-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-meta-item leancloud_visitors" data-flag-title="Leetcode 2 Add Two Numbers 题解分析" title="Views">
+            <span id="/2020/10/18/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E4%BA%94/" class="post-meta-item leancloud_visitors" data-flag-title="在老丈人家的小工记五" title="Views">
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@@ -376,8 +386,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2020/10/11/Leetcode-2-Add-Two-Numbers-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/10/11/Leetcode-2-Add-Two-Numbers-题解分析/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/10/18/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E4%BA%94/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/10/18/在老丈人家的小工记五/" itemprop="commentCount"></span>
     </a>
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@@ -392,17 +402,7 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <p>又 roll 到了一个以前做过的题，不过现在用 Java 也来写一下，是 easy 级别的，所以就简单说下</p>
-<h2 id="简要介绍"><a href="#简要介绍" class="headerlink" title="简要介绍"></a>简要介绍</h2><p>You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list.</p>
-<p>You may assume the two numbers do not contain any leading zero, except the number 0 itself.<br>就是给了两个链表，用来表示两个非负的整数，在链表中倒序放着，每个节点包含一位的数字，把他们加起来以后也按照原来的链表结构输出</p>
-<h2 id="样例"><a href="#样例" class="headerlink" title="样例"></a>样例</h2><h4 id="example-1"><a href="#example-1" class="headerlink" title="example 1"></a>example 1</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Input: l1 &#x3D; [2,4,3], l2 &#x3D; [5,6,4]</span><br><span class="line">Output: [7,0,8]</span><br><span class="line">Explanation: 342 + 465 &#x3D; 807.</span><br></pre></td></tr></table></figure>
-
-<h4 id="example-2"><a href="#example-2" class="headerlink" title="example 2"></a>example 2</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Input: l1 &#x3D; [0], l2 &#x3D; [0]</span><br><span class="line">Output: [0]</span><br></pre></td></tr></table></figure>
-
-<h4 id="example-3"><a href="#example-3" class="headerlink" title="example 3"></a>example 3</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Input: l1 &#x3D; [9,9,9,9,9,9,9], l2 &#x3D; [9,9,9,9]</span><br><span class="line">Output: [8,9,9,9,0,0,0,1]</span><br></pre></td></tr></table></figure>
-
-<h2 id="题解"><a href="#题解" class="headerlink" title="题解"></a>题解</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> ListNode <span class="title">addTwoNumbers</span><span class="params">(ListNode l1, ListNode l2)</span> </span>&#123;</span><br><span class="line">        ListNode root = <span class="keyword">new</span> ListNode();</span><br><span class="line">        <span class="keyword">if</span> (l1 == <span class="keyword">null</span> &amp;&amp; l2 == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">return</span> root;</span><br><span class="line">        &#125;</span><br><span class="line">        ListNode tail = root;</span><br><span class="line">        <span class="keyword">int</span> entered = <span class="number">0</span>;</span><br><span class="line">        <span class="comment">// 这个条件加了 entered，就是还有进位的数</span></span><br><span class="line">        <span class="keyword">while</span> (l1 != <span class="keyword">null</span> || l2 != <span class="keyword">null</span> || entered != <span class="number">0</span>) &#123;</span><br><span class="line">            <span class="keyword">int</span> temp = entered;</span><br><span class="line">            <span class="keyword">if</span> (l1 != <span class="keyword">null</span>) &#123;</span><br><span class="line">                temp += l1.val;</span><br><span class="line">                l1 = l1.next;</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">if</span> (l2 != <span class="keyword">null</span>) &#123;</span><br><span class="line">                temp += l2.val;</span><br><span class="line">                l2 = l2.next;</span><br><span class="line">            &#125;</span><br><span class="line">            entered = (temp - temp % <span class="number">10</span>) / <span class="number">10</span>;</span><br><span class="line">            tail.val = temp % <span class="number">10</span>;</span><br><span class="line">            <span class="comment">// 循环内部的控制是为了排除最后的空节点</span></span><br><span class="line">            <span class="keyword">if</span> (l1 != <span class="keyword">null</span> || l2 != <span class="keyword">null</span> || entered != <span class="number">0</span>) &#123;</span><br><span class="line">                tail.next = <span class="keyword">new</span> ListNode();</span><br><span class="line">                tail = tail.next;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="comment">//        tail = null;</span></span><br><span class="line">        <span class="keyword">return</span> root;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
-<p>这里唯二需要注意的就是两个点，一个是循环条件需要包含进位值还存在的情况，还有一个是最后一个节点，如果是空的了，就不要在 new 一个出来了，写的比较挫</p>
+          <p>终于回忆起来了，年纪大了写这种东西真的要立马写，不然很容易想不起来，那天应该是 9 月 12 日，也就是上周六，因为我爸也去了，而且娘亲（丈母娘，LD 这么叫，我也就随了她这么叫，当然是背后，当面就叫妈）也在那，早上一到那二爹就给我爸指挥了活，要挖一条院子的出水道，自己想出来的词，因为觉得下水道是竖的，在那稍稍帮了一会会忙，然后我还是比较惯例的跟着 LD 还有娘亲去住的家里，主要是老丈人可能也不太想让我干太累的活，因为上次已经差不多把三楼都整理干净了，然后就是二楼了，二楼说实话我也帮不上什么忙，主要是衣服被子什么的，正好是有张以前小孩子睡过的那种摇篮床，看上去虽然有一些破损，整体还是不错的，所以打算拿过去，我就负责把它拆掉了，比较简单的是只要拧螺丝就行了，但是其实是用了好多好多工具才搞定的，一开始只要螺丝刀就行了，但是因为年代久了，后面的螺帽也有点锈住或者本身就会串着会一起动，所以拿来了个扳手，大部分的其实都被这两个工具给搞定了，但是后期大概还剩下四分之一的时候，有一颗完全锈住，并且螺纹跟之前那些都不一样，但是这个已经是最大的螺丝刀了，也没办法换个大的了，所以又去找来个一字的，因为十字的不是也可以用一字的拧嘛，结果可能是我买的工具箱里的一字螺丝刀太新了，口子那很锋利，直接把螺丝花纹给划掉了，大的小的都划掉，然后真的变成凹进去一个圆柱体了，然后就想能不能隔一层布去拧，然而因为的确是已经变成圆柱体了，布也不太给力，不放弃的我又去找来了个老虎钳，妄图把划掉的螺丝用老虎钳钳住，另一端用扳手拧开螺帽，但是这个螺丝跟螺帽真的是生锈的太严重了，外加上钳不太牢，完全是两边一起转，实在是没办法了，在征得同意之后，直接掰断了，火死了，一颗螺丝折腾得比我拆一张床还久，那天因为早上去的也比较晚了，然后就快吃午饭了，正好想着带一点东西过去，就把一些脸盆，泡脚桶啥的拿过去了，先是去吃了饭，还是在那家快餐店，菜的口味还是依然不错，就是人比较多，我爸旁边都是素菜，都没怎么吃远一点的荤菜，下次要早点去，把荤菜放我爸旁边😄（PS：他们家饭还是依然尴尬，需要等），吃完就开到在修的房子那把东西拿了出来，我爸已经动作很快的打了一小半的地沟了，说实话那玩意真的是很重，我之前把它从三楼拿下来，就觉得这个太重了，这次还要用起来，感觉我的手会分分钟废掉，不过一开始我还是跟着LD去了住的家里，惯例睡了午觉，那天睡得比较踏实，竟然睡了一个小时，醒了想了下，其实LD她们收拾也用不上我（没啥力气活），我还是去帮我爸他们，跟LD说了下就去了在修的老房子那，两位老爹在一起钻地，看着就很累，我连忙上去想换一会他们，因为刚好是钻到混凝土地线，特别难，力道不够就会滑开，用蛮力就是钻进去拔不出来，原理是因为本身浇的时候就是很紧实的，需要边钻边动，那家伙实在是太重了，真的是汗如雨下，基本是三个人轮流来，我是个添乱的，经常卡住，然后把地线，其实就是一条混凝土横梁，里面还有14跟18的钢筋，需要割断，这个割断也是很有技巧，钢筋本身在里面是受到挤压的，直接用切割的，到快断掉的时候就会崩一下，非常危险，还是老丈人比较有经验，要留一点点，然后直接用榔头敲断就好了，本来以为这个是最难的了，结果下面是一块非常大的青基石，而且也是石头跟石头挤一块，边上一点点打钻有点杯水车薪，后来是用那种螺旋的钻，钻四个洞，相对位置大概是个长方形，这样子把中间这个长方形钻出来就比较容易地能拿出来了，后面的也容易搞出来了，后面的其实难度不是特别大了，主要是地沟打好之后得看看高低是不是符合要求的，不能本来是往外排水的反而外面高，这个怎么看就又很有技巧了，一般在地上的只要侧着看一下就好了，考究点就用下水平尺，但是在地下的，不用水平尺，其实可以借助于地沟里正要放进去的水管，放点水进去，看水往哪流就行了，铺好水管后，就剩填埋的活了，不是太麻烦了，那天真的是累到了，打那个混凝土的时候我真的是把我整个人压上去了，不过也挺爽的，有点把平时无处发泄的蛮力发泄出去了。</p>
 
       
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@@ -424,7 +424,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/10/03/mybatis-%E7%9A%84%E7%BC%93%E5%AD%98%E6%98%AF%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/10/11/Leetcode-2-Add-Two-Numbers-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/">
 
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       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -438,7 +438,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2020/10/03/mybatis-%E7%9A%84%E7%BC%93%E5%AD%98%E6%98%AF%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B/" class="post-title-link" itemprop="url">mybatis 的缓存是怎么回事</a>
+            <a href="/2020/10/11/Leetcode-2-Add-Two-Numbers-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-title-link" itemprop="url">Leetcode 2 Add Two Numbers 题解分析</a>
         </h2>
 
         <div class="post-meta">
@@ -447,8 +447,9 @@
                 <i class="far fa-calendar"></i>
               </span>
               <span class="post-meta-item-text">Posted on</span>
+              
 
-              <time title="Created: 2020-10-03 22:43:13" itemprop="dateCreated datePublished" datetime="2020-10-03T22:43:13+08:00">2020-10-03</time>
+              <time title="Created: 2020-10-11 23:22:45 / Modified: 23:23:51" itemprop="dateCreated datePublished" datetime="2020-10-11T23:22:45+08:00">2020-10-11</time>
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@@ -460,28 +461,24 @@
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                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Spring/" itemprop="url" rel="index"><span itemprop="name">Spring</span></a>
+                  <a href="/categories/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Spring/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a>
+                  <a href="/categories/linked-list/" itemprop="url" rel="index"><span itemprop="name">linked list</span></a>
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                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a>
+                  <a href="/categories/leetcode/java/" itemprop="url" rel="index"><span itemprop="name">java</span></a>
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                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Mybatis/%E7%BC%93%E5%AD%98/" itemprop="url" rel="index"><span itemprop="name">缓存</span></a>
+                  <a href="/categories/leetcode/java/linked-list/" itemprop="url" rel="index"><span itemprop="name">linked list</span></a>
                 </span>
             </span>
 
           
-            <span id="/2020/10/03/mybatis-%E7%9A%84%E7%BC%93%E5%AD%98%E6%98%AF%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B/" class="post-meta-item leancloud_visitors" data-flag-title="mybatis 的缓存是怎么回事" title="Views">
+            <span id="/2020/10/11/Leetcode-2-Add-Two-Numbers-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-meta-item leancloud_visitors" data-flag-title="Leetcode 2 Add Two Numbers 题解分析" title="Views">
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@@ -496,8 +493,8 @@
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       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2020/10/03/mybatis-%E7%9A%84%E7%BC%93%E5%AD%98%E6%98%AF%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/10/03/mybatis-的缓存是怎么回事/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/10/11/Leetcode-2-Add-Two-Numbers-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/10/11/Leetcode-2-Add-Two-Numbers-题解分析/" itemprop="commentCount"></span>
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@@ -512,33 +509,18 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <p>Java 真的是任何一个中间件，比较常用的那种，都有很多内容值得深挖，比如这个缓存，慢慢有过一些感悟，比如如何提升性能，缓存无疑是一大重要手段，最底层开始 CPU 就有缓存，而且又小又贵，再往上一点内存一般作为硬盘存储在运行时的存储，一般在代码里也会用内存作为一些本地缓存，譬如数据库，像 mysql 这种也是有innodb_buffer_pool来提升查询效率，本质上理解就是用更快的存储作为相对慢存储的缓存，减少查询直接访问较慢的存储，并且这个都是相对的，比起 cpu 的缓存，那内存也是渣，但是与普通机械硬盘相比，那也是两个次元的水平。</p>
-<p>闲扯这么多来说说 mybatis 的缓存，mybatis 一般作为一个轻量级的 orm 使用，相对应的就是比较重量级的 hibernate，不过不在这次讨论范围，上一次是主要讲了 mybatis 在解析 sql 过程中，对于两种占位符的不同替换实现策略，这次主要聊下 mybatis 的缓存，前面其实得了解下前置的东西，比如 sqlsession，先当做我们知道 sqlsession 是个什么玩意，可能或多或少的知道 mybatis 是有两级缓存，</p>
-<h3 id="一级缓存"><a href="#一级缓存" class="headerlink" title="一级缓存"></a>一级缓存</h3><p>第一级的缓存是在 <a href="https://github.com/mybatis/mybatis-3/blob/master/src/main/java/org/apache/ibatis/executor/BaseExecutor.java#L65" target="_blank" rel="noopener">BaseExecutor</a> 中的 <a href="https://github.com/mybatis/mybatis-3/blob/master/src/main/java/org/apache/ibatis/cache/impl/PerpetualCache.java#L27" target="_blank" rel="noopener">PerpetualCache</a>，它是个最基本的缓存实现类，使用了 HashMap 实现缓存功能，代码其实没几十行</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">PerpetualCache</span> <span class="keyword">implements</span> <span class="title">Cache</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> String id;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Map&lt;Object, Object&gt; cache = <span class="keyword">new</span> HashMap&lt;&gt;();</span><br><span class="line"></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="title">PerpetualCache</span><span class="params">(String id)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.id = id;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> String <span class="title">getId</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> id;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getSize</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> cache.size();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">putObject</span><span class="params">(Object key, Object value)</span> </span>&#123;</span><br><span class="line">    cache.put(key, value);</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> Object <span class="title">getObject</span><span class="params">(Object key)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> cache.get(key);</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> Object <span class="title">removeObject</span><span class="params">(Object key)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> cache.remove(key);</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">clear</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    cache.clear();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">equals</span><span class="params">(Object o)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (getId() == <span class="keyword">null</span>) &#123;</span><br><span class="line">      <span class="keyword">throw</span> <span class="keyword">new</span> CacheException(<span class="string">"Cache instances require an ID."</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (<span class="keyword">this</span> == o) &#123;</span><br><span class="line">      <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (!(o <span class="keyword">instanceof</span> Cache)) &#123;</span><br><span class="line">      <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    Cache otherCache = (Cache) o;</span><br><span class="line">    <span class="keyword">return</span> getId().equals(otherCache.getId());</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">hashCode</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (getId() == <span class="keyword">null</span>) &#123;</span><br><span class="line">      <span class="keyword">throw</span> <span class="keyword">new</span> CacheException(<span class="string">"Cache instances require an ID."</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> getId().hashCode();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>可以看一下BaseExecutor 的构造函数</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">protected</span> <span class="title">BaseExecutor</span><span class="params">(Configuration configuration, Transaction transaction)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.transaction = transaction;</span><br><span class="line">    <span class="keyword">this</span>.deferredLoads = <span class="keyword">new</span> ConcurrentLinkedQueue&lt;&gt;();</span><br><span class="line">    <span class="keyword">this</span>.localCache = <span class="keyword">new</span> PerpetualCache(<span class="string">"LocalCache"</span>);</span><br><span class="line">    <span class="keyword">this</span>.localOutputParameterCache = <span class="keyword">new</span> PerpetualCache(<span class="string">"LocalOutputParameterCache"</span>);</span><br><span class="line">    <span class="keyword">this</span>.closed = <span class="keyword">false</span>;</span><br><span class="line">    <span class="keyword">this</span>.configuration = configuration;</span><br><span class="line">    <span class="keyword">this</span>.wrapper = <span class="keyword">this</span>;</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
-<p>就是把 PerpetualCache 作为 localCache，然后怎么使用我看简单看一下，BaseExecutor 的查询首先是调用这个函数</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line">  <span class="keyword">public</span> &lt;E&gt; <span class="function">List&lt;E&gt; <span class="title">query</span><span class="params">(MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler)</span> <span class="keyword">throws</span> SQLException </span>&#123;</span><br><span class="line">    BoundSql boundSql = ms.getBoundSql(parameter);</span><br><span class="line">    CacheKey key = createCacheKey(ms, parameter, rowBounds, boundSql);</span><br><span class="line">    <span class="keyword">return</span> query(ms, parameter, rowBounds, resultHandler, key, boundSql);</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
-<p>可以看到首先是调用了 <a href="https://github.com/mybatis/mybatis-3/blob/master/src/main/java/org/apache/ibatis/executor/BaseExecutor.java#L195" target="_blank" rel="noopener">createCacheKey</a> 方法，这个方法呢，先不看怎么写的，如果我们自己要实现这么个缓存，首先这个缓存 key 的设计也是个问题，如果是以表名加主键作为 key，那么分页查询，或者没有主键的时候就不行，来看看 mybatis 是怎么设计的</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> CacheKey <span class="title">createCacheKey</span><span class="params">(MappedStatement ms, Object parameterObject, RowBounds rowBounds, BoundSql boundSql)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (closed) &#123;</span><br><span class="line">      <span class="keyword">throw</span> <span class="keyword">new</span> ExecutorException(<span class="string">"Executor was closed."</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    CacheKey cacheKey = <span class="keyword">new</span> CacheKey();</span><br><span class="line">    cacheKey.update(ms.getId());</span><br><span class="line">    cacheKey.update(rowBounds.getOffset());</span><br><span class="line">    cacheKey.update(rowBounds.getLimit());</span><br><span class="line">    cacheKey.update(boundSql.getSql());</span><br><span class="line">    List&lt;ParameterMapping&gt; parameterMappings = boundSql.getParameterMappings();</span><br><span class="line">    TypeHandlerRegistry typeHandlerRegistry = ms.getConfiguration().getTypeHandlerRegistry();</span><br><span class="line">    <span class="comment">// mimic DefaultParameterHandler logic</span></span><br><span class="line">    <span class="keyword">for</span> (ParameterMapping parameterMapping : parameterMappings) &#123;</span><br><span class="line">      <span class="keyword">if</span> (parameterMapping.getMode() != ParameterMode.OUT) &#123;</span><br><span class="line">        Object value;</span><br><span class="line">        String propertyName = parameterMapping.getProperty();</span><br><span class="line">        <span class="keyword">if</span> (boundSql.hasAdditionalParameter(propertyName)) &#123;</span><br><span class="line">          value = boundSql.getAdditionalParameter(propertyName);</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (parameterObject == <span class="keyword">null</span>) &#123;</span><br><span class="line">          value = <span class="keyword">null</span>;</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) &#123;</span><br><span class="line">          value = parameterObject;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">          MetaObject metaObject = configuration.newMetaObject(parameterObject);</span><br><span class="line">          value = metaObject.getValue(propertyName);</span><br><span class="line">        &#125;</span><br><span class="line">        cacheKey.update(value);</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (configuration.getEnvironment() != <span class="keyword">null</span>) &#123;</span><br><span class="line">      <span class="comment">// issue #176</span></span><br><span class="line">      cacheKey.update(configuration.getEnvironment().getId());</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> cacheKey;</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
-<p>首先需要 id，这个 id 是 mapper 里方法的 id， 然后是偏移量跟返回行数，再就是 sql，然后是参数，基本上是会有影响的都加进去了，在这个 update 里面</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">update</span><span class="params">(Object object)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">int</span> baseHashCode = object == <span class="keyword">null</span> ? <span class="number">1</span> : ArrayUtil.hashCode(object);</span><br><span class="line"></span><br><span class="line">    count++;</span><br><span class="line">    checksum += baseHashCode;</span><br><span class="line">    baseHashCode *= count;</span><br><span class="line"></span><br><span class="line">    hashcode = multiplier * hashcode + baseHashCode;</span><br><span class="line"></span><br><span class="line">    updateList.add(object);</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
-<p>其实是一个 hash 转换，具体不纠结，就是提高特异性，然后回来就是继续调用 query</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line">  <span class="keyword">public</span> &lt;E&gt; <span class="function">List&lt;E&gt; <span class="title">query</span><span class="params">(MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, CacheKey key, BoundSql boundSql)</span> <span class="keyword">throws</span> SQLException </span>&#123;</span><br><span class="line">    ErrorContext.instance().resource(ms.getResource()).activity(<span class="string">"executing a query"</span>).object(ms.getId());</span><br><span class="line">    <span class="keyword">if</span> (closed) &#123;</span><br><span class="line">      <span class="keyword">throw</span> <span class="keyword">new</span> ExecutorException(<span class="string">"Executor was closed."</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (queryStack == <span class="number">0</span> &amp;&amp; ms.isFlushCacheRequired()) &#123;</span><br><span class="line">      clearLocalCache();</span><br><span class="line">    &#125;</span><br><span class="line">    List&lt;E&gt; list;</span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">      queryStack++;</span><br><span class="line">      list = resultHandler == <span class="keyword">null</span> ? (List&lt;E&gt;) localCache.getObject(key) : <span class="keyword">null</span>;</span><br><span class="line">      <span class="keyword">if</span> (list != <span class="keyword">null</span>) &#123;</span><br><span class="line">        handleLocallyCachedOutputParameters(ms, key, parameter, boundSql);</span><br><span class="line">      &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        list = queryFromDatabase(ms, parameter, rowBounds, resultHandler, key, boundSql);</span><br><span class="line">      &#125;</span><br><span class="line">    &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">      queryStack--;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (queryStack == <span class="number">0</span>) &#123;</span><br><span class="line">      <span class="keyword">for</span> (DeferredLoad deferredLoad : deferredLoads) &#123;</span><br><span class="line">        deferredLoad.load();</span><br><span class="line">      &#125;</span><br><span class="line">      <span class="comment">// issue #601</span></span><br><span class="line">      deferredLoads.clear();</span><br><span class="line">      <span class="keyword">if</span> (configuration.getLocalCacheScope() == LocalCacheScope.STATEMENT) &#123;</span><br><span class="line">        <span class="comment">// issue #482</span></span><br><span class="line">        clearLocalCache();</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> list;</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
-<p>可以看到是先从 localCache 里取，取不到再 queryFromDatabase，其实比较简单，这是一级缓存，考虑到 sqlsession 跟 BaseExecutor 的关系，其实是随着 sqlsession 来保证这个缓存不会出现脏数据幻读的情况，当然事务相关的后面可能再单独聊。</p>
-<h3 id="二级缓存"><a href="#二级缓存" class="headerlink" title="二级缓存"></a>二级缓存</h3><p>其实这个一级二级顺序有点反过来，其实查询的是先走的二级缓存，当然二级的需要配置开启，默认不开，<br>需要通过</p>
-<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">setting</span> <span class="attr">name</span>=<span class="string">"cacheEnabled"</span> <span class="attr">value</span>=<span class="string">"true"</span>/&gt;</span></span><br></pre></td></tr></table></figure>
-<p>来开启，然后我们的查询就会走到</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">CachingExecutor</span> <span class="keyword">implements</span> <span class="title">Executor</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Executor delegate;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> TransactionalCacheManager tcm = <span class="keyword">new</span> TransactionalCacheManager();</span><br></pre></td></tr></table></figure>
-<p>这个 Executor 中，这里我放了类里面的元素，发现没有一个 Cache 类，这就是一个特点了，往下看查询过程</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line">  <span class="keyword">public</span> &lt;E&gt; <span class="function">List&lt;E&gt; <span class="title">query</span><span class="params">(MappedStatement ms, Object parameterObject, RowBounds rowBounds, ResultHandler resultHandler)</span> <span class="keyword">throws</span> SQLException </span>&#123;</span><br><span class="line">    BoundSql boundSql = ms.getBoundSql(parameterObject);</span><br><span class="line">    CacheKey key = createCacheKey(ms, parameterObject, rowBounds, boundSql);</span><br><span class="line">    <span class="keyword">return</span> query(ms, parameterObject, rowBounds, resultHandler, key, boundSql);</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="keyword">public</span> &lt;E&gt; <span class="function">List&lt;E&gt; <span class="title">query</span><span class="params">(MappedStatement ms, Object parameterObject, RowBounds rowBounds, ResultHandler resultHandler, CacheKey key, BoundSql boundSql)</span></span></span><br><span class="line"><span class="function">      <span class="keyword">throws</span> SQLException </span>&#123;</span><br><span class="line">    Cache cache = ms.getCache();</span><br><span class="line">    <span class="keyword">if</span> (cache != <span class="keyword">null</span>) &#123;</span><br><span class="line">      flushCacheIfRequired(ms);</span><br><span class="line">      <span class="keyword">if</span> (ms.isUseCache() &amp;&amp; resultHandler == <span class="keyword">null</span>) &#123;</span><br><span class="line">        ensureNoOutParams(ms, boundSql);</span><br><span class="line">        <span class="meta">@SuppressWarnings</span>(<span class="string">"unchecked"</span>)</span><br><span class="line">        List&lt;E&gt; list = (List&lt;E&gt;) tcm.getObject(cache, key);</span><br><span class="line">        <span class="keyword">if</span> (list == <span class="keyword">null</span>) &#123;</span><br><span class="line">          list = delegate.query(ms, parameterObject, rowBounds, resultHandler, key, boundSql);</span><br><span class="line">          tcm.putObject(cache, key, list); <span class="comment">// issue #578 and #116</span></span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> list;</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> delegate.query(ms, parameterObject, rowBounds, resultHandler, key, boundSql);</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
-<p>看到没，其实缓存是从 tcm 这个成员变量里取，而这个是什么呢，事务性缓存(直译下)，因为这个其实是用 MappedStatement 里的 Cache 作为key 从 tcm 的 map 取出来的</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TransactionalCacheManager</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Map&lt;Cache, TransactionalCache&gt; transactionalCaches = <span class="keyword">new</span> HashMap&lt;&gt;();</span><br></pre></td></tr></table></figure>
-<p>MappedStatement是被全局使用的，所以其实二级缓存是跟着 mapper 的 namespace 走的，可以被多个 CachingExecutor 获取到，就会出现线程安全问题，线程安全问题可以用SynchronizedCache来解决，就是加锁，但是对于事务中的脏读，使用了TransactionalCache来解决这个问题，</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TransactionalCache</span> <span class="keyword">implements</span> <span class="title">Cache</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> Log log = LogFactory.getLog(TransactionalCache<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Cache delegate;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">boolean</span> clearOnCommit;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Map&lt;Object, Object&gt; entriesToAddOnCommit;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Set&lt;Object&gt; entriesMissedInCache;</span><br></pre></td></tr></table></figure>
-<p>在事务还没提交的时候，会把中间状态的数据放在 entriesToAddOnCommit 中，只有在提交后会放进共享缓存中，</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">commit</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (clearOnCommit) &#123;</span><br><span class="line">      delegate.clear();</span><br><span class="line">    &#125;</span><br><span class="line">    flushPendingEntries();</span><br><span class="line">    reset();</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
+          <p>又 roll 到了一个以前做过的题，不过现在用 Java 也来写一下，是 easy 级别的，所以就简单说下</p>
+<h2 id="简要介绍"><a href="#简要介绍" class="headerlink" title="简要介绍"></a>简要介绍</h2><p>You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list.</p>
+<p>You may assume the two numbers do not contain any leading zero, except the number 0 itself.<br>就是给了两个链表，用来表示两个非负的整数，在链表中倒序放着，每个节点包含一位的数字，把他们加起来以后也按照原来的链表结构输出</p>
+<h2 id="样例"><a href="#样例" class="headerlink" title="样例"></a>样例</h2><h4 id="example-1"><a href="#example-1" class="headerlink" title="example 1"></a>example 1</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Input: l1 &#x3D; [2,4,3], l2 &#x3D; [5,6,4]</span><br><span class="line">Output: [7,0,8]</span><br><span class="line">Explanation: 342 + 465 &#x3D; 807.</span><br></pre></td></tr></table></figure>
+
+<h4 id="example-2"><a href="#example-2" class="headerlink" title="example 2"></a>example 2</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Input: l1 &#x3D; [0], l2 &#x3D; [0]</span><br><span class="line">Output: [0]</span><br></pre></td></tr></table></figure>
+
+<h4 id="example-3"><a href="#example-3" class="headerlink" title="example 3"></a>example 3</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Input: l1 &#x3D; [9,9,9,9,9,9,9], l2 &#x3D; [9,9,9,9]</span><br><span class="line">Output: [8,9,9,9,0,0,0,1]</span><br></pre></td></tr></table></figure>
+
+<h2 id="题解"><a href="#题解" class="headerlink" title="题解"></a>题解</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> ListNode <span class="title">addTwoNumbers</span><span class="params">(ListNode l1, ListNode l2)</span> </span>&#123;</span><br><span class="line">        ListNode root = <span class="keyword">new</span> ListNode();</span><br><span class="line">        <span class="keyword">if</span> (l1 == <span class="keyword">null</span> &amp;&amp; l2 == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">return</span> root;</span><br><span class="line">        &#125;</span><br><span class="line">        ListNode tail = root;</span><br><span class="line">        <span class="keyword">int</span> entered = <span class="number">0</span>;</span><br><span class="line">        <span class="comment">// 这个条件加了 entered，就是还有进位的数</span></span><br><span class="line">        <span class="keyword">while</span> (l1 != <span class="keyword">null</span> || l2 != <span class="keyword">null</span> || entered != <span class="number">0</span>) &#123;</span><br><span class="line">            <span class="keyword">int</span> temp = entered;</span><br><span class="line">            <span class="keyword">if</span> (l1 != <span class="keyword">null</span>) &#123;</span><br><span class="line">                temp += l1.val;</span><br><span class="line">                l1 = l1.next;</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">if</span> (l2 != <span class="keyword">null</span>) &#123;</span><br><span class="line">                temp += l2.val;</span><br><span class="line">                l2 = l2.next;</span><br><span class="line">            &#125;</span><br><span class="line">            entered = (temp - temp % <span class="number">10</span>) / <span class="number">10</span>;</span><br><span class="line">            tail.val = temp % <span class="number">10</span>;</span><br><span class="line">            <span class="comment">// 循环内部的控制是为了排除最后的空节点</span></span><br><span class="line">            <span class="keyword">if</span> (l1 != <span class="keyword">null</span> || l2 != <span class="keyword">null</span> || entered != <span class="number">0</span>) &#123;</span><br><span class="line">                tail.next = <span class="keyword">new</span> ListNode();</span><br><span class="line">                tail = tail.next;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="comment">//        tail = null;</span></span><br><span class="line">        <span class="keyword">return</span> root;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
+<p>这里唯二需要注意的就是两个点，一个是循环条件需要包含进位值还存在的情况，还有一个是最后一个节点，如果是空的了，就不要在 new 一个出来了，写的比较挫</p>
+
       
     </div>
 
@@ -559,7 +541,7 @@
   
   
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+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/10/03/mybatis-%E7%9A%84%E7%BC%93%E5%AD%98%E6%98%AF%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B/">
 
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       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -573,7 +555,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2020/09/26/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E5%9B%9B/" class="post-title-link" itemprop="url">在老丈人家的小工记四</a>
+            <a href="/2020/10/03/mybatis-%E7%9A%84%E7%BC%93%E5%AD%98%E6%98%AF%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B/" class="post-title-link" itemprop="url">mybatis 的缓存是怎么回事</a>
         </h2>
 
         <div class="post-meta">
@@ -583,7 +565,7 @@
               </span>
               <span class="post-meta-item-text">Posted on</span>
 
-              <time title="Created: 2020-09-26 23:48:05" itemprop="dateCreated datePublished" datetime="2020-09-26T23:48:05+08:00">2020-09-26</time>
+              <time title="Created: 2020-10-03 22:43:13" itemprop="dateCreated datePublished" datetime="2020-10-03T22:43:13+08:00">2020-10-03</time>
             </span>
             <span class="post-meta-item">
               <span class="post-meta-item-icon">
@@ -591,24 +573,32 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
+                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/" itemprop="url" rel="index"><span itemprop="name">运动</span></a>
+                  <a href="/categories/Java/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/" itemprop="url" rel="index"><span itemprop="name">跑步</span></a>
+                  <a href="/categories/Spring/" itemprop="url" rel="index"><span itemprop="name">Spring</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/%E5%B9%B2%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">干活</span></a>
+                  <a href="/categories/Spring/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Mybatis/%E7%BC%93%E5%AD%98/" itemprop="url" rel="index"><span itemprop="name">缓存</span></a>
                 </span>
             </span>
 
           
-            <span id="/2020/09/26/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E5%9B%9B/" class="post-meta-item leancloud_visitors" data-flag-title="在老丈人家的小工记四" title="Views">
+            <span id="/2020/10/03/mybatis-%E7%9A%84%E7%BC%93%E5%AD%98%E6%98%AF%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B/" class="post-meta-item leancloud_visitors" data-flag-title="mybatis 的缓存是怎么回事" title="Views">
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@@ -623,8 +613,8 @@
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       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2020/09/26/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E5%9B%9B/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/09/26/在老丈人家的小工记四/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/10/03/mybatis-%E7%9A%84%E7%BC%93%E5%AD%98%E6%98%AF%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/10/03/mybatis-的缓存是怎么回事/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -639,8 +629,33 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <h2 id="小工记四"><a href="#小工记四" class="headerlink" title="小工记四"></a>小工记四</h2><p>第四周去的时候让我们去了现在在住的房子里，去三楼整理东西了，蛮多的东西需要收拾整理，有些需要丢一下，以前往往是把不太要用的东西就放三楼了，但是后面就不会再去收拾整理，LD 跟丈母娘负责收拾，我不太知道哪些还要的，哪些不要了，而且本来也不擅长这种收拾🤦‍♂️，然后就变成她们收拾出来废纸箱，我负责拆掉，压平，这时候终于觉得体重还算是有点作用，总体来说这个事情我其实也不擅长，不擅长的主要是捆起来，可能我总是小题大做，因为纸箱大小不一，如果不做一下分类，然后把大的折小一些的话，直接绑起来，容易拎起来就散掉了，而且一些鞋盒子这种小件的纸盒会比较薄，冰箱这种大件的比较厚，厚的比较不容易变形，需要大力踩踏，而且扎的时候需要用体重压住捆实了之后那样子才是真的捆实的，不然待会又是松松垮垮容易滑出来散架，因为压住了捆好后，下来了之后箱子就会弹开了把绳子崩紧实，感觉又是掌握到生活小技巧了😃，我这里其实比较单调无聊，然后 LD 那可以说非常厉害了，一共理出来 11 把旧电扇，还有好多没用过全新的不锈钢脸盆大大小小的，感觉比店里在卖的还多，还有是有比较多小时候的东西，特别多小时候的衣服，其实这种对我来说最难了，可能需要读一下断舍离，蛮多东西都舍不得扔，但是其实是没啥用了，然后还占地方，这天应该算是比较轻松的一天了，上午主要是把收拾出来要的和不要的搬下楼，然后下午要去把纸板给卖掉。中午还是去小快餐店吃的，在住的家里理东西还有个好处就是中午吃完饭可以小憩一下，因为我个人是非常依赖午休的，不然下午完全没精神，而且心态也会比较烦躁，一方面是客观的的确比较疲惫，另一方面应该主观心理作用也有点影响，就像上班的时候也是觉得不午睡就会很难受，心理作用也有一点，不过总之能睡还是睡一会，真的没办法就心态好点，吃完午饭之后我们就推着小平板车去收废品的地方卖掉了上午我收拾捆起来的纸板，好像卖了一百多，都是直接过地磅了，不用一捆一捆地称，不过有个小插曲，那里另外一个大爷在倒他的三轮车的时候撞了我一下，还好车速慢，屁股上肉垫后，接下来就比较麻烦了，是LD 她们两姐妹从小到大的书，也要去卖掉，小平板车就载不下了，而且着实也不太好推，轮子不太平，导致推着很累，书有好多箱，本来是想去亲戚家借电动三轮车，因为不会开摩托的那种，摩托的那种 LD 邻居家就有，可是到了那发现那个也是很大，而且刹车是用脚踩的那种，俺爹不太放心，就说第二天周日他有空会帮忙去载了卖掉的，然后比较搞笑的来了，丈母娘看错了时间，以为已经快五点了，就让我们顺便在车里带点东西去在修的房子，放到那边三楼去，到了那还跟老丈人说已经这么迟了要赶紧去菜场买菜了，结果我们回来以后才发现看错了一个小时🤦‍♂️。<br>前面可以没提，前三周去的我们一般就周六去一天，然后周日因为要早点回杭州，而且可能想让我们周日能休息下，但是这周就因为周日的时候我爸要去帮忙载书，然后 LD 姐姐也会过来收拾东西，我们周日就又去整理收拾了，周日由于俺爹去的很早，我过去的时候书已经木有了，主要是去收拾东西了，把一些有用没用的继续整理，基本上三楼的就处理完毕了，舒了一大口气，毕竟让丈母娘一个人收拾实在是太累了，但是要扔掉的衣服比较棘手，附近知道的青蛙回收桶被推倒了，其他地方也不知道哪里有，我们就先载了一些东西去在修的房子那，然后去找青蛙桶，结果一个小区可以进，但是已经满了，另一个不让进，后来只能让 LD 姐姐带去她们小区扔了，塞了满满一车。因为要赶回杭州的车就没有等我爸一起回来，他还在那帮忙搞卫生间的墙缝。<br>虽然这两天不太热，活也不算很吃力，不过我这个体重和易出汗的体质，还是让短袖不知道湿透了多少次，灌了好多水和冰红茶（下午能提提神），回来周一早上称体重也比较喜人，差一点就达到阶段目标，可以想想去哪里吃之前想好的烤肉跟火锅了（估计吃完立马回到解放前）。</p>
-
+          <p>Java 真的是任何一个中间件，比较常用的那种，都有很多内容值得深挖，比如这个缓存，慢慢有过一些感悟，比如如何提升性能，缓存无疑是一大重要手段，最底层开始 CPU 就有缓存，而且又小又贵，再往上一点内存一般作为硬盘存储在运行时的存储，一般在代码里也会用内存作为一些本地缓存，譬如数据库，像 mysql 这种也是有innodb_buffer_pool来提升查询效率，本质上理解就是用更快的存储作为相对慢存储的缓存，减少查询直接访问较慢的存储，并且这个都是相对的，比起 cpu 的缓存，那内存也是渣，但是与普通机械硬盘相比，那也是两个次元的水平。</p>
+<p>闲扯这么多来说说 mybatis 的缓存，mybatis 一般作为一个轻量级的 orm 使用，相对应的就是比较重量级的 hibernate，不过不在这次讨论范围，上一次是主要讲了 mybatis 在解析 sql 过程中，对于两种占位符的不同替换实现策略，这次主要聊下 mybatis 的缓存，前面其实得了解下前置的东西，比如 sqlsession，先当做我们知道 sqlsession 是个什么玩意，可能或多或少的知道 mybatis 是有两级缓存，</p>
+<h3 id="一级缓存"><a href="#一级缓存" class="headerlink" title="一级缓存"></a>一级缓存</h3><p>第一级的缓存是在 <a href="https://github.com/mybatis/mybatis-3/blob/master/src/main/java/org/apache/ibatis/executor/BaseExecutor.java#L65" target="_blank" rel="noopener">BaseExecutor</a> 中的 <a href="https://github.com/mybatis/mybatis-3/blob/master/src/main/java/org/apache/ibatis/cache/impl/PerpetualCache.java#L27" target="_blank" rel="noopener">PerpetualCache</a>，它是个最基本的缓存实现类，使用了 HashMap 实现缓存功能，代码其实没几十行</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">PerpetualCache</span> <span class="keyword">implements</span> <span class="title">Cache</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> String id;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Map&lt;Object, Object&gt; cache = <span class="keyword">new</span> HashMap&lt;&gt;();</span><br><span class="line"></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="title">PerpetualCache</span><span class="params">(String id)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.id = id;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> String <span class="title">getId</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> id;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getSize</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> cache.size();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">putObject</span><span class="params">(Object key, Object value)</span> </span>&#123;</span><br><span class="line">    cache.put(key, value);</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> Object <span class="title">getObject</span><span class="params">(Object key)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> cache.get(key);</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> Object <span class="title">removeObject</span><span class="params">(Object key)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> cache.remove(key);</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">clear</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    cache.clear();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">equals</span><span class="params">(Object o)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (getId() == <span class="keyword">null</span>) &#123;</span><br><span class="line">      <span class="keyword">throw</span> <span class="keyword">new</span> CacheException(<span class="string">"Cache instances require an ID."</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (<span class="keyword">this</span> == o) &#123;</span><br><span class="line">      <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (!(o <span class="keyword">instanceof</span> Cache)) &#123;</span><br><span class="line">      <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    Cache otherCache = (Cache) o;</span><br><span class="line">    <span class="keyword">return</span> getId().equals(otherCache.getId());</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">hashCode</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (getId() == <span class="keyword">null</span>) &#123;</span><br><span class="line">      <span class="keyword">throw</span> <span class="keyword">new</span> CacheException(<span class="string">"Cache instances require an ID."</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> getId().hashCode();</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>可以看一下BaseExecutor 的构造函数</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">protected</span> <span class="title">BaseExecutor</span><span class="params">(Configuration configuration, Transaction transaction)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.transaction = transaction;</span><br><span class="line">    <span class="keyword">this</span>.deferredLoads = <span class="keyword">new</span> ConcurrentLinkedQueue&lt;&gt;();</span><br><span class="line">    <span class="keyword">this</span>.localCache = <span class="keyword">new</span> PerpetualCache(<span class="string">"LocalCache"</span>);</span><br><span class="line">    <span class="keyword">this</span>.localOutputParameterCache = <span class="keyword">new</span> PerpetualCache(<span class="string">"LocalOutputParameterCache"</span>);</span><br><span class="line">    <span class="keyword">this</span>.closed = <span class="keyword">false</span>;</span><br><span class="line">    <span class="keyword">this</span>.configuration = configuration;</span><br><span class="line">    <span class="keyword">this</span>.wrapper = <span class="keyword">this</span>;</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
+<p>就是把 PerpetualCache 作为 localCache，然后怎么使用我看简单看一下，BaseExecutor 的查询首先是调用这个函数</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line">  <span class="keyword">public</span> &lt;E&gt; <span class="function">List&lt;E&gt; <span class="title">query</span><span class="params">(MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler)</span> <span class="keyword">throws</span> SQLException </span>&#123;</span><br><span class="line">    BoundSql boundSql = ms.getBoundSql(parameter);</span><br><span class="line">    CacheKey key = createCacheKey(ms, parameter, rowBounds, boundSql);</span><br><span class="line">    <span class="keyword">return</span> query(ms, parameter, rowBounds, resultHandler, key, boundSql);</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
+<p>可以看到首先是调用了 <a href="https://github.com/mybatis/mybatis-3/blob/master/src/main/java/org/apache/ibatis/executor/BaseExecutor.java#L195" target="_blank" rel="noopener">createCacheKey</a> 方法，这个方法呢，先不看怎么写的，如果我们自己要实现这么个缓存，首先这个缓存 key 的设计也是个问题，如果是以表名加主键作为 key，那么分页查询，或者没有主键的时候就不行，来看看 mybatis 是怎么设计的</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> CacheKey <span class="title">createCacheKey</span><span class="params">(MappedStatement ms, Object parameterObject, RowBounds rowBounds, BoundSql boundSql)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (closed) &#123;</span><br><span class="line">      <span class="keyword">throw</span> <span class="keyword">new</span> ExecutorException(<span class="string">"Executor was closed."</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    CacheKey cacheKey = <span class="keyword">new</span> CacheKey();</span><br><span class="line">    cacheKey.update(ms.getId());</span><br><span class="line">    cacheKey.update(rowBounds.getOffset());</span><br><span class="line">    cacheKey.update(rowBounds.getLimit());</span><br><span class="line">    cacheKey.update(boundSql.getSql());</span><br><span class="line">    List&lt;ParameterMapping&gt; parameterMappings = boundSql.getParameterMappings();</span><br><span class="line">    TypeHandlerRegistry typeHandlerRegistry = ms.getConfiguration().getTypeHandlerRegistry();</span><br><span class="line">    <span class="comment">// mimic DefaultParameterHandler logic</span></span><br><span class="line">    <span class="keyword">for</span> (ParameterMapping parameterMapping : parameterMappings) &#123;</span><br><span class="line">      <span class="keyword">if</span> (parameterMapping.getMode() != ParameterMode.OUT) &#123;</span><br><span class="line">        Object value;</span><br><span class="line">        String propertyName = parameterMapping.getProperty();</span><br><span class="line">        <span class="keyword">if</span> (boundSql.hasAdditionalParameter(propertyName)) &#123;</span><br><span class="line">          value = boundSql.getAdditionalParameter(propertyName);</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (parameterObject == <span class="keyword">null</span>) &#123;</span><br><span class="line">          value = <span class="keyword">null</span>;</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) &#123;</span><br><span class="line">          value = parameterObject;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">          MetaObject metaObject = configuration.newMetaObject(parameterObject);</span><br><span class="line">          value = metaObject.getValue(propertyName);</span><br><span class="line">        &#125;</span><br><span class="line">        cacheKey.update(value);</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (configuration.getEnvironment() != <span class="keyword">null</span>) &#123;</span><br><span class="line">      <span class="comment">// issue #176</span></span><br><span class="line">      cacheKey.update(configuration.getEnvironment().getId());</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> cacheKey;</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
+<p>首先需要 id，这个 id 是 mapper 里方法的 id， 然后是偏移量跟返回行数，再就是 sql，然后是参数，基本上是会有影响的都加进去了，在这个 update 里面</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">update</span><span class="params">(Object object)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">int</span> baseHashCode = object == <span class="keyword">null</span> ? <span class="number">1</span> : ArrayUtil.hashCode(object);</span><br><span class="line"></span><br><span class="line">    count++;</span><br><span class="line">    checksum += baseHashCode;</span><br><span class="line">    baseHashCode *= count;</span><br><span class="line"></span><br><span class="line">    hashcode = multiplier * hashcode + baseHashCode;</span><br><span class="line"></span><br><span class="line">    updateList.add(object);</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
+<p>其实是一个 hash 转换，具体不纠结，就是提高特异性，然后回来就是继续调用 query</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line">  <span class="keyword">public</span> &lt;E&gt; <span class="function">List&lt;E&gt; <span class="title">query</span><span class="params">(MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, CacheKey key, BoundSql boundSql)</span> <span class="keyword">throws</span> SQLException </span>&#123;</span><br><span class="line">    ErrorContext.instance().resource(ms.getResource()).activity(<span class="string">"executing a query"</span>).object(ms.getId());</span><br><span class="line">    <span class="keyword">if</span> (closed) &#123;</span><br><span class="line">      <span class="keyword">throw</span> <span class="keyword">new</span> ExecutorException(<span class="string">"Executor was closed."</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (queryStack == <span class="number">0</span> &amp;&amp; ms.isFlushCacheRequired()) &#123;</span><br><span class="line">      clearLocalCache();</span><br><span class="line">    &#125;</span><br><span class="line">    List&lt;E&gt; list;</span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">      queryStack++;</span><br><span class="line">      list = resultHandler == <span class="keyword">null</span> ? (List&lt;E&gt;) localCache.getObject(key) : <span class="keyword">null</span>;</span><br><span class="line">      <span class="keyword">if</span> (list != <span class="keyword">null</span>) &#123;</span><br><span class="line">        handleLocallyCachedOutputParameters(ms, key, parameter, boundSql);</span><br><span class="line">      &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        list = queryFromDatabase(ms, parameter, rowBounds, resultHandler, key, boundSql);</span><br><span class="line">      &#125;</span><br><span class="line">    &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">      queryStack--;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (queryStack == <span class="number">0</span>) &#123;</span><br><span class="line">      <span class="keyword">for</span> (DeferredLoad deferredLoad : deferredLoads) &#123;</span><br><span class="line">        deferredLoad.load();</span><br><span class="line">      &#125;</span><br><span class="line">      <span class="comment">// issue #601</span></span><br><span class="line">      deferredLoads.clear();</span><br><span class="line">      <span class="keyword">if</span> (configuration.getLocalCacheScope() == LocalCacheScope.STATEMENT) &#123;</span><br><span class="line">        <span class="comment">// issue #482</span></span><br><span class="line">        clearLocalCache();</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> list;</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
+<p>可以看到是先从 localCache 里取，取不到再 queryFromDatabase，其实比较简单，这是一级缓存，考虑到 sqlsession 跟 BaseExecutor 的关系，其实是随着 sqlsession 来保证这个缓存不会出现脏数据幻读的情况，当然事务相关的后面可能再单独聊。</p>
+<h3 id="二级缓存"><a href="#二级缓存" class="headerlink" title="二级缓存"></a>二级缓存</h3><p>其实这个一级二级顺序有点反过来，其实查询的是先走的二级缓存，当然二级的需要配置开启，默认不开，<br>需要通过</p>
+<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">setting</span> <span class="attr">name</span>=<span class="string">"cacheEnabled"</span> <span class="attr">value</span>=<span class="string">"true"</span>/&gt;</span></span><br></pre></td></tr></table></figure>
+<p>来开启，然后我们的查询就会走到</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">CachingExecutor</span> <span class="keyword">implements</span> <span class="title">Executor</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Executor delegate;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> TransactionalCacheManager tcm = <span class="keyword">new</span> TransactionalCacheManager();</span><br></pre></td></tr></table></figure>
+<p>这个 Executor 中，这里我放了类里面的元素，发现没有一个 Cache 类，这就是一个特点了，往下看查询过程</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line">  <span class="keyword">public</span> &lt;E&gt; <span class="function">List&lt;E&gt; <span class="title">query</span><span class="params">(MappedStatement ms, Object parameterObject, RowBounds rowBounds, ResultHandler resultHandler)</span> <span class="keyword">throws</span> SQLException </span>&#123;</span><br><span class="line">    BoundSql boundSql = ms.getBoundSql(parameterObject);</span><br><span class="line">    CacheKey key = createCacheKey(ms, parameterObject, rowBounds, boundSql);</span><br><span class="line">    <span class="keyword">return</span> query(ms, parameterObject, rowBounds, resultHandler, key, boundSql);</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="keyword">public</span> &lt;E&gt; <span class="function">List&lt;E&gt; <span class="title">query</span><span class="params">(MappedStatement ms, Object parameterObject, RowBounds rowBounds, ResultHandler resultHandler, CacheKey key, BoundSql boundSql)</span></span></span><br><span class="line"><span class="function">      <span class="keyword">throws</span> SQLException </span>&#123;</span><br><span class="line">    Cache cache = ms.getCache();</span><br><span class="line">    <span class="keyword">if</span> (cache != <span class="keyword">null</span>) &#123;</span><br><span class="line">      flushCacheIfRequired(ms);</span><br><span class="line">      <span class="keyword">if</span> (ms.isUseCache() &amp;&amp; resultHandler == <span class="keyword">null</span>) &#123;</span><br><span class="line">        ensureNoOutParams(ms, boundSql);</span><br><span class="line">        <span class="meta">@SuppressWarnings</span>(<span class="string">"unchecked"</span>)</span><br><span class="line">        List&lt;E&gt; list = (List&lt;E&gt;) tcm.getObject(cache, key);</span><br><span class="line">        <span class="keyword">if</span> (list == <span class="keyword">null</span>) &#123;</span><br><span class="line">          list = delegate.query(ms, parameterObject, rowBounds, resultHandler, key, boundSql);</span><br><span class="line">          tcm.putObject(cache, key, list); <span class="comment">// issue #578 and #116</span></span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> list;</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> delegate.query(ms, parameterObject, rowBounds, resultHandler, key, boundSql);</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
+<p>看到没，其实缓存是从 tcm 这个成员变量里取，而这个是什么呢，事务性缓存(直译下)，因为这个其实是用 MappedStatement 里的 Cache 作为key 从 tcm 的 map 取出来的</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TransactionalCacheManager</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Map&lt;Cache, TransactionalCache&gt; transactionalCaches = <span class="keyword">new</span> HashMap&lt;&gt;();</span><br></pre></td></tr></table></figure>
+<p>MappedStatement是被全局使用的，所以其实二级缓存是跟着 mapper 的 namespace 走的，可以被多个 CachingExecutor 获取到，就会出现线程安全问题，线程安全问题可以用SynchronizedCache来解决，就是加锁，但是对于事务中的脏读，使用了TransactionalCache来解决这个问题，</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TransactionalCache</span> <span class="keyword">implements</span> <span class="title">Cache</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> Log log = LogFactory.getLog(TransactionalCache<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Cache delegate;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">boolean</span> clearOnCommit;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Map&lt;Object, Object&gt; entriesToAddOnCommit;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Set&lt;Object&gt; entriesMissedInCache;</span><br></pre></td></tr></table></figure>
+<p>在事务还没提交的时候，会把中间状态的数据放在 entriesToAddOnCommit 中，只有在提交后会放进共享缓存中，</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">commit</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (clearOnCommit) &#123;</span><br><span class="line">      delegate.clear();</span><br><span class="line">    &#125;</span><br><span class="line">    flushPendingEntries();</span><br><span class="line">    reset();</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
       
     </div>
 
@@ -661,7 +676,7 @@
   
   
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+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/09/26/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E5%9B%9B/">
 
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       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -675,7 +690,7 @@
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         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2020/09/20/Leetcode-3-Longest-Substring-Without-Repeating-Characters-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-title-link" itemprop="url">Leetcode 3 Longest Substring Without Repeating Characters 题解分析</a>
+            <a href="/2020/09/26/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E5%9B%9B/" class="post-title-link" itemprop="url">在老丈人家的小工记四</a>
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@@ -684,9 +699,8 @@
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               </span>
               <span class="post-meta-item-text">Posted on</span>
-              
 
-              <time title="Created: 2020-09-20 21:40:23 / Modified: 21:45:17" itemprop="dateCreated datePublished" datetime="2020-09-20T21:40:23+08:00">2020-09-20</time>
+              <time title="Created: 2020-09-26 23:48:05" itemprop="dateCreated datePublished" datetime="2020-09-26T23:48:05+08:00">2020-09-26</time>
             </span>
             <span class="post-meta-item">
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@@ -694,28 +708,24 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E5%AD%97%E7%AC%A6%E4%B8%B2-online/" itemprop="url" rel="index"><span itemprop="name">字符串 - online</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/" itemprop="url" rel="index"><span itemprop="name">运动</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/leetcode/java/" itemprop="url" rel="index"><span itemprop="name">java</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/" itemprop="url" rel="index"><span itemprop="name">跑步</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/leetcode/java/string/" itemprop="url" rel="index"><span itemprop="name">string</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/%E5%B9%B2%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">干活</span></a>
                 </span>
             </span>
 
           
-            <span id="/2020/09/20/Leetcode-3-Longest-Substring-Without-Repeating-Characters-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-meta-item leancloud_visitors" data-flag-title="Leetcode 3 Longest Substring Without Repeating Characters 题解分析" title="Views">
+            <span id="/2020/09/26/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E5%9B%9B/" class="post-meta-item leancloud_visitors" data-flag-title="在老丈人家的小工记四" title="Views">
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@@ -730,8 +740,8 @@
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       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2020/09/20/Leetcode-3-Longest-Substring-Without-Repeating-Characters-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/09/20/Leetcode-3-Longest-Substring-Without-Repeating-Characters-题解分析/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/09/26/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E5%9B%9B/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/09/26/在老丈人家的小工记四/" itemprop="commentCount"></span>
     </a>
   </span>
   
@@ -746,17 +756,7 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <p>又做了个题，看记录是以前用 C++写过的，现在捋一捋思路，用 Java 再写了一下，思路还是比较清晰的，但是边界细节处理得比较差</p>
-<h2 id="简要介绍"><a href="#简要介绍" class="headerlink" title="简要介绍"></a>简要介绍</h2><p>Given a string <code>s</code>, find the length of the <strong>longest substring</strong> without repeating characters.</p>
-<h2 id="样例"><a href="#样例" class="headerlink" title="样例"></a>样例</h2><h4 id="Example-1"><a href="#Example-1" class="headerlink" title="Example 1:"></a>Example 1:</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Input: s &#x3D; &quot;abcabcbb&quot;</span><br><span class="line">Output: 3</span><br><span class="line">Explanation: The answer is &quot;abc&quot;, with the length of 3.</span><br></pre></td></tr></table></figure>
-
-<h4 id="Example-2"><a href="#Example-2" class="headerlink" title="Example 2:"></a>Example 2:</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Input: s &#x3D; &quot;bbbbb&quot;</span><br><span class="line">Output: 1</span><br><span class="line">Explanation: The answer is &quot;b&quot;, with the length of 1.</span><br></pre></td></tr></table></figure>
-<h4 id="Example-3"><a href="#Example-3" class="headerlink" title="Example 3:"></a>Example 3:</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Input: s &#x3D; &quot;pwwkew&quot;</span><br><span class="line">Output: 3</span><br><span class="line">Explanation: The answer is &quot;wke&quot;, with the length of 3.</span><br><span class="line">Notice that the answer must be a substring, &quot;pwke&quot; is a subsequence and not a substring.</span><br></pre></td></tr></table></figure>
-<h4 id="Example-4"><a href="#Example-4" class="headerlink" title="Example 4:"></a>Example 4:</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Input: s &#x3D; &quot;&quot;</span><br><span class="line">Output: 0</span><br></pre></td></tr></table></figure>
-
-<p>就是一个最长不重复的字符串长度，因为也是中等难度的题，不太需要特别复杂的思考，最基本的就是O(N*N)两重循环，不过显然不太好，万一超时间，还有一种就是线性复杂度的了，这个就是需要搞定一个思路，比如字符串时 <code>a</code>bcdefg<code>a</code>qwrty，比如遍历到第二个<code>a</code>的时候其实不用再从头去遍历了，只要把前面那个<code>a</code>给排除掉，继续往下算就好了</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> </span>&#123;</span><br><span class="line">    Map&lt;String, Integer&gt; counter = <span class="keyword">new</span> HashMap&lt;&gt;();</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">lengthOfLongestSubstring</span><span class="params">(String s)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">int</span> length = s.length();</span><br><span class="line">        <span class="comment">// 当前的长度</span></span><br><span class="line">        <span class="keyword">int</span> subStringLength = <span class="number">0</span>;</span><br><span class="line">        <span class="comment">// 最长的长度</span></span><br><span class="line">        <span class="keyword">int</span> maxSubStringLength = <span class="number">0</span>;</span><br><span class="line">        <span class="comment">// 考虑到重复的位置已经被跳过的情况，即已经在当前长度的字符串范围之前的重复字符不需要回溯</span></span><br><span class="line">        <span class="keyword">int</span> lastDuplicatePos = -<span class="number">1</span>;</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; length; i++) &#123;</span><br><span class="line">            <span class="comment">// 使用 map 存储字符和上一次出现的位置，如果存在并且大于上一次重复位置</span></span><br><span class="line">            <span class="keyword">if</span> (counter.get(String.valueOf(s.charAt(i))) != <span class="keyword">null</span> &amp;&amp; counter.get(String.valueOf(s.charAt(i))) &gt; lastDuplicatePos) &#123;</span><br><span class="line">                <span class="comment">// 记录重复位置</span></span><br><span class="line">                lastDuplicatePos = counter.get(String.valueOf(s.charAt(i)));</span><br><span class="line">                <span class="comment">// 重置不重复子串的长度，减去重复起点</span></span><br><span class="line">                subStringLength = i - counter.get(String.valueOf(s.charAt(i))) - <span class="number">1</span>;</span><br><span class="line">                <span class="comment">// 替换当前位置</span></span><br><span class="line">                counter.replace(String.valueOf(s.charAt(i)), i);</span><br><span class="line">            &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                <span class="comment">// 如果不存在就直接 put</span></span><br><span class="line">                counter.put(String.valueOf(s.charAt(i)), i);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="comment">// 长度累加</span></span><br><span class="line">            subStringLength++;</span><br><span class="line">            <span class="keyword">if</span> (subStringLength &gt; maxSubStringLength) &#123;</span><br><span class="line">                <span class="comment">// 简单替换</span></span><br><span class="line">                maxSubStringLength = subStringLength;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> maxSubStringLength;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>注释应该写的比较清楚了。</p>
+          <h2 id="小工记四"><a href="#小工记四" class="headerlink" title="小工记四"></a>小工记四</h2><p>第四周去的时候让我们去了现在在住的房子里，去三楼整理东西了，蛮多的东西需要收拾整理，有些需要丢一下，以前往往是把不太要用的东西就放三楼了，但是后面就不会再去收拾整理，LD 跟丈母娘负责收拾，我不太知道哪些还要的，哪些不要了，而且本来也不擅长这种收拾🤦‍♂️，然后就变成她们收拾出来废纸箱，我负责拆掉，压平，这时候终于觉得体重还算是有点作用，总体来说这个事情我其实也不擅长，不擅长的主要是捆起来，可能我总是小题大做，因为纸箱大小不一，如果不做一下分类，然后把大的折小一些的话，直接绑起来，容易拎起来就散掉了，而且一些鞋盒子这种小件的纸盒会比较薄，冰箱这种大件的比较厚，厚的比较不容易变形，需要大力踩踏，而且扎的时候需要用体重压住捆实了之后那样子才是真的捆实的，不然待会又是松松垮垮容易滑出来散架，因为压住了捆好后，下来了之后箱子就会弹开了把绳子崩紧实，感觉又是掌握到生活小技巧了😃，我这里其实比较单调无聊，然后 LD 那可以说非常厉害了，一共理出来 11 把旧电扇，还有好多没用过全新的不锈钢脸盆大大小小的，感觉比店里在卖的还多，还有是有比较多小时候的东西，特别多小时候的衣服，其实这种对我来说最难了，可能需要读一下断舍离，蛮多东西都舍不得扔，但是其实是没啥用了，然后还占地方，这天应该算是比较轻松的一天了，上午主要是把收拾出来要的和不要的搬下楼，然后下午要去把纸板给卖掉。中午还是去小快餐店吃的，在住的家里理东西还有个好处就是中午吃完饭可以小憩一下，因为我个人是非常依赖午休的，不然下午完全没精神，而且心态也会比较烦躁，一方面是客观的的确比较疲惫，另一方面应该主观心理作用也有点影响，就像上班的时候也是觉得不午睡就会很难受，心理作用也有一点，不过总之能睡还是睡一会，真的没办法就心态好点，吃完午饭之后我们就推着小平板车去收废品的地方卖掉了上午我收拾捆起来的纸板，好像卖了一百多，都是直接过地磅了，不用一捆一捆地称，不过有个小插曲，那里另外一个大爷在倒他的三轮车的时候撞了我一下，还好车速慢，屁股上肉垫后，接下来就比较麻烦了，是LD 她们两姐妹从小到大的书，也要去卖掉，小平板车就载不下了，而且着实也不太好推，轮子不太平，导致推着很累，书有好多箱，本来是想去亲戚家借电动三轮车，因为不会开摩托的那种，摩托的那种 LD 邻居家就有，可是到了那发现那个也是很大，而且刹车是用脚踩的那种，俺爹不太放心，就说第二天周日他有空会帮忙去载了卖掉的，然后比较搞笑的来了，丈母娘看错了时间，以为已经快五点了，就让我们顺便在车里带点东西去在修的房子，放到那边三楼去，到了那还跟老丈人说已经这么迟了要赶紧去菜场买菜了，结果我们回来以后才发现看错了一个小时🤦‍♂️。<br>前面可以没提，前三周去的我们一般就周六去一天，然后周日因为要早点回杭州，而且可能想让我们周日能休息下，但是这周就因为周日的时候我爸要去帮忙载书，然后 LD 姐姐也会过来收拾东西，我们周日就又去整理收拾了，周日由于俺爹去的很早，我过去的时候书已经木有了，主要是去收拾东西了，把一些有用没用的继续整理，基本上三楼的就处理完毕了，舒了一大口气，毕竟让丈母娘一个人收拾实在是太累了，但是要扔掉的衣服比较棘手，附近知道的青蛙回收桶被推倒了，其他地方也不知道哪里有，我们就先载了一些东西去在修的房子那，然后去找青蛙桶，结果一个小区可以进，但是已经满了，另一个不让进，后来只能让 LD 姐姐带去她们小区扔了，塞了满满一车。因为要赶回杭州的车就没有等我爸一起回来，他还在那帮忙搞卫生间的墙缝。<br>虽然这两天不太热，活也不算很吃力，不过我这个体重和易出汗的体质，还是让短袖不知道湿透了多少次，灌了好多水和冰红茶（下午能提提神），回来周一早上称体重也比较喜人，差一点就达到阶段目标，可以想想去哪里吃之前想好的烤肉跟火锅了（估计吃完立马回到解放前）。</p>
 
       
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@@ -845,7 +845,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -920,7 +920,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
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diff --git a/page/4/index.html b/page/4/index.html
index 40a65eae10..a01e109e04 100644
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+++ b/page/4/index.html
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+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/09/20/Leetcode-3-Longest-Substring-Without-Repeating-Characters-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/">
 
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@@ -218,7 +218,7 @@
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-            <a href="/2020/09/13/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E4%B8%89/" class="post-title-link" itemprop="url">在老丈人家的小工记三</a>
+            <a href="/2020/09/20/Leetcode-3-Longest-Substring-Without-Repeating-Characters-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-title-link" itemprop="url">Leetcode 3 Longest Substring Without Repeating Characters 题解分析</a>
         </h2>
 
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@@ -229,7 +229,7 @@
               <span class="post-meta-item-text">Posted on</span>
               
 
-              <time title="Created: 2020-09-13 23:37:21 / Modified: 23:39:01" itemprop="dateCreated datePublished" datetime="2020-09-13T23:37:21+08:00">2020-09-13</time>
+              <time title="Created: 2020-09-20 21:40:23 / Modified: 21:45:17" itemprop="dateCreated datePublished" datetime="2020-09-20T21:40:23+08:00">2020-09-20</time>
             </span>
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@@ -237,24 +237,28 @@
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               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
+                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/" itemprop="url" rel="index"><span itemprop="name">运动</span></a>
+                  <a href="/categories/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
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+                  <a href="/categories/%E5%AD%97%E7%AC%A6%E4%B8%B2-online/" itemprop="url" rel="index"><span itemprop="name">字符串 - online</span></a>
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+                  <a href="/categories/leetcode/java/" itemprop="url" rel="index"><span itemprop="name">java</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/leetcode/java/string/" itemprop="url" rel="index"><span itemprop="name">string</span></a>
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+            <span id="/2020/09/20/Leetcode-3-Longest-Substring-Without-Repeating-Characters-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-meta-item leancloud_visitors" data-flag-title="Leetcode 3 Longest Substring Without Repeating Characters 题解分析" title="Views">
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@@ -269,8 +273,8 @@
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       <span class="post-meta-item-text">Disqus: </span>
     
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-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/09/13/在老丈人家的小工记三/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/09/20/Leetcode-3-Longest-Substring-Without-Repeating-Characters-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/09/20/Leetcode-3-Longest-Substring-Without-Repeating-Characters-题解分析/" itemprop="commentCount"></span>
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-          <h2 id="小工记三"><a href="#小工记三" class="headerlink" title="小工记三"></a>小工记三</h2><p>前面这两周周末也都去老丈人家帮忙了，上上周周六先是去了那个在装修的旧房子那，把三楼收拾了下，因为要搬进来住，来不及等二楼装修好，就要把三楼里的东西都整理干净，这个活感觉是比较 easy，原来是就准备把三楼当放东西仓储的地方了，我们乡下大部分三层楼都是这么用的，这次也是没办法，之前搬进来的木头什么的都搬出去，主要是这上面灰尘太多，后面清理鼻孔的时候都是黑色的了，把东西都搬出去以后主要是地还是很脏，就扫了地拖了地，因为是水泥地，灰尘又太多了，拖起来都是会灰尘扬起来，整个脱完了的确干净很多，然而这会就出了个大乌龙，我们清理的是三楼的西边一间，结果老丈人上来说要住东边那间的🤦‍♂️，不过其实西边的也得清理，因为还是要放被子什么的，不算是白费功夫，接着清理东边那间，之前这个房子做过群租房，里面有个高低铺的床，当时觉得可以用在放被子什么的就没扔，只是拆掉了放旁边，我们就把它擦干净了又装好，发现螺丝🔩少了几个，亘古不变的真理，拆了以后装要不就多几个要不就少几个，不是很牢靠，不过用来放放被子省得放地上总还是可以的，对了前面还做了个事情就是铺地毯，其实也不是地毯，就是类似于墙布雨篷布那种，别人不用了送给我们的，三楼水泥地也不会铺瓷砖地板了就放一下，干净好看点，不过大小不合适要裁一下，那把剪刀是真的太难用了，我手都要抽筋了，它就是刀口只有一小个点是能剪下来的，其他都是钝的，后来还是用刀片直接裁，铺好以后，真的感觉也不太一样了，焕然一新的感觉<br>差不多中午了就去吃饭了，之前两次是去了一家小饭店，还是还比较干净，但是店里菜不好吃，还死贵，这次去了一家小快餐店，口味好，便宜，味道是真的不错，带鱼跟黄鱼都好吃，一点都不腥，我对这类比较腥的鱼真的是很挑剔的，基本上除了家里做的很少吃外面的，那天抱着试试的态度吃了下，真的还不错，后来丈母娘说好像这家老板是给别人结婚喜事酒席当厨师的，怪不得做的好吃，其实本来是有一点小抗拒，怕不干净什么的，后来发现菜很好吃，而且可能是老丈人跟干活的师傅去吃的比较多，老板很客气，我们吃完饭，还给我们买了葡萄吃，不过这家店有一个槽点，就是饭比较不好吃，有时候会夹生，不过后面聊起来其实是这种小菜馆饭点的通病，烧的太早太多容易多出来浪费，烧的迟了不够吃，而且大的电饭锅比较不容易烧好。<br>下午前面还是在处理三楼的，窗户上各种钉子，实在是太多了，我后面在走廊上排了一排🤦‍♂️，有些是直接断了，有些是就撬了出来，感觉我在杭州租房也没有这样子各种钉钉子，挂下衣服什么的也不用这么多吧，比较不能理解，搞得到处都是钉子。那天我爸也去帮忙了，主要是在卫生间里做白缝，其实也是个技术活，印象中好像我小时候自己家里也做过这个事情，但是比较模糊了，后面我们三楼搞完了就去帮我爸了，前面是我老婆二爹在那先刷上白缝，这里叫白缝，有些考究的也叫美缝，就是瓷砖铺完之后的缝，如果不去弄的话，里面水泥的颜色就露出来了，而且容易渗水，所以就要用白水泥加胶水搅拌之后糊在缝上，但是也不是直接糊，先要把缝抠一抠，因为铺瓷砖的还不会仔细到每个缝里的水泥都是一样满，而且也需要一些空间糊上去，不然就太表面的一层很容易被水直接冲掉了，然后这次其实也不是用的白水泥，而是直接现成买来就已经配好的用来填缝的，兑水搅拌均匀就好了，后面就主要是我跟我爸在搞，那个时候真的觉得我实在是太胖了，蹲下去真的没一会就受不了了，膝盖什么的太难受了，后面我跪着刷，然后膝盖又疼，也是比较不容易，不过我爸动作很快，我中间跪累了休息一会，我爸就能搞一大片，后面其实我也没做多少（谦虚一下），总体来讲这次不是很累，就是蹲着跪着腿有点受不了，是应该好好减肥了。</p>
+          <p>又做了个题，看记录是以前用 C++写过的，现在捋一捋思路，用 Java 再写了一下，思路还是比较清晰的，但是边界细节处理得比较差</p>
+<h2 id="简要介绍"><a href="#简要介绍" class="headerlink" title="简要介绍"></a>简要介绍</h2><p>Given a string <code>s</code>, find the length of the <strong>longest substring</strong> without repeating characters.</p>
+<h2 id="样例"><a href="#样例" class="headerlink" title="样例"></a>样例</h2><h4 id="Example-1"><a href="#Example-1" class="headerlink" title="Example 1:"></a>Example 1:</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Input: s &#x3D; &quot;abcabcbb&quot;</span><br><span class="line">Output: 3</span><br><span class="line">Explanation: The answer is &quot;abc&quot;, with the length of 3.</span><br></pre></td></tr></table></figure>
+
+<h4 id="Example-2"><a href="#Example-2" class="headerlink" title="Example 2:"></a>Example 2:</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Input: s &#x3D; &quot;bbbbb&quot;</span><br><span class="line">Output: 1</span><br><span class="line">Explanation: The answer is &quot;b&quot;, with the length of 1.</span><br></pre></td></tr></table></figure>
+<h4 id="Example-3"><a href="#Example-3" class="headerlink" title="Example 3:"></a>Example 3:</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Input: s &#x3D; &quot;pwwkew&quot;</span><br><span class="line">Output: 3</span><br><span class="line">Explanation: The answer is &quot;wke&quot;, with the length of 3.</span><br><span class="line">Notice that the answer must be a substring, &quot;pwke&quot; is a subsequence and not a substring.</span><br></pre></td></tr></table></figure>
+<h4 id="Example-4"><a href="#Example-4" class="headerlink" title="Example 4:"></a>Example 4:</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Input: s &#x3D; &quot;&quot;</span><br><span class="line">Output: 0</span><br></pre></td></tr></table></figure>
+
+<p>就是一个最长不重复的字符串长度，因为也是中等难度的题，不太需要特别复杂的思考，最基本的就是O(N*N)两重循环，不过显然不太好，万一超时间，还有一种就是线性复杂度的了，这个就是需要搞定一个思路，比如字符串时 <code>a</code>bcdefg<code>a</code>qwrty，比如遍历到第二个<code>a</code>的时候其实不用再从头去遍历了，只要把前面那个<code>a</code>给排除掉，继续往下算就好了</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> </span>&#123;</span><br><span class="line">    Map&lt;String, Integer&gt; counter = <span class="keyword">new</span> HashMap&lt;&gt;();</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">lengthOfLongestSubstring</span><span class="params">(String s)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">int</span> length = s.length();</span><br><span class="line">        <span class="comment">// 当前的长度</span></span><br><span class="line">        <span class="keyword">int</span> subStringLength = <span class="number">0</span>;</span><br><span class="line">        <span class="comment">// 最长的长度</span></span><br><span class="line">        <span class="keyword">int</span> maxSubStringLength = <span class="number">0</span>;</span><br><span class="line">        <span class="comment">// 考虑到重复的位置已经被跳过的情况，即已经在当前长度的字符串范围之前的重复字符不需要回溯</span></span><br><span class="line">        <span class="keyword">int</span> lastDuplicatePos = -<span class="number">1</span>;</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; length; i++) &#123;</span><br><span class="line">            <span class="comment">// 使用 map 存储字符和上一次出现的位置，如果存在并且大于上一次重复位置</span></span><br><span class="line">            <span class="keyword">if</span> (counter.get(String.valueOf(s.charAt(i))) != <span class="keyword">null</span> &amp;&amp; counter.get(String.valueOf(s.charAt(i))) &gt; lastDuplicatePos) &#123;</span><br><span class="line">                <span class="comment">// 记录重复位置</span></span><br><span class="line">                lastDuplicatePos = counter.get(String.valueOf(s.charAt(i)));</span><br><span class="line">                <span class="comment">// 重置不重复子串的长度，减去重复起点</span></span><br><span class="line">                subStringLength = i - counter.get(String.valueOf(s.charAt(i))) - <span class="number">1</span>;</span><br><span class="line">                <span class="comment">// 替换当前位置</span></span><br><span class="line">                counter.replace(String.valueOf(s.charAt(i)), i);</span><br><span class="line">            &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                <span class="comment">// 如果不存在就直接 put</span></span><br><span class="line">                counter.put(String.valueOf(s.charAt(i)), i);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="comment">// 长度累加</span></span><br><span class="line">            subStringLength++;</span><br><span class="line">            <span class="keyword">if</span> (subStringLength &gt; maxSubStringLength) &#123;</span><br><span class="line">                <span class="comment">// 简单替换</span></span><br><span class="line">                maxSubStringLength = subStringLength;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> maxSubStringLength;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>注释应该写的比较清楚了。</p>
 
       
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@@ -307,7 +321,7 @@
   
   
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-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/09/06/mybatis-%E7%9A%84-%E5%92%8C-%E6%98%AF%E6%9C%89%E5%95%A5%E5%8C%BA%E5%88%AB/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/09/13/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E4%B8%89/">
 
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       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -321,7 +335,7 @@
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         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2020/09/06/mybatis-%E7%9A%84-%E5%92%8C-%E6%98%AF%E6%9C%89%E5%95%A5%E5%8C%BA%E5%88%AB/" class="post-title-link" itemprop="url">mybatis 的 $ 和 # 是有啥区别</a>
+            <a href="/2020/09/13/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E4%B8%89/" class="post-title-link" itemprop="url">在老丈人家的小工记三</a>
         </h2>
 
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@@ -332,7 +346,7 @@
               <span class="post-meta-item-text">Posted on</span>
               
 
-              <time title="Created: 2020-09-06 23:14:50 / Modified: 23:18:32" itemprop="dateCreated datePublished" datetime="2020-09-06T23:14:50+08:00">2020-09-06</time>
+              <time title="Created: 2020-09-13 23:37:21 / Modified: 23:39:01" itemprop="dateCreated datePublished" datetime="2020-09-13T23:37:21+08:00">2020-09-13</time>
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             <span class="post-meta-item">
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@@ -340,32 +354,24 @@
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               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Mysql/" itemprop="url" rel="index"><span itemprop="name">Mysql</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
                 </span>
                   , 
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-                  <a href="/categories/Mysql/Sql%E6%B3%A8%E5%85%A5/" itemprop="url" rel="index"><span itemprop="name">Sql注入</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/" itemprop="url" rel="index"><span itemprop="name">运动</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Spring/" itemprop="url" rel="index"><span itemprop="name">Spring</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/" itemprop="url" rel="index"><span itemprop="name">跑步</span></a>
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                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Spring/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/%E5%B9%B2%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">干活</span></a>
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@@ -380,8 +386,8 @@
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       <span class="post-meta-item-text">Disqus: </span>
     
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-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/09/06/mybatis-的-和-是有啥区别/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/09/13/%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E7%9A%84%E5%B0%8F%E5%B7%A5%E8%AE%B0%E4%B8%89/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/09/13/在老丈人家的小工记三/" itemprop="commentCount"></span>
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@@ -396,11 +402,7 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <p>这个问题也是面试中常被问到的，就抽空来了解下这个，跳过一大段前面初始化的逻辑，<br>对于一条<code>select * from t1 where id = #{id}</code>这样的 sql，在初始化扫描 mapper 的xml文件的时候会根据是否是 dynamic 来判断生成 DynamicSqlSource 还是 RawSqlSource，这里它是一条 RawSqlSource，<br>在这里做了替换，将<code>#{}</code>替换成了<code>?</code><br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/c84r0g.png" alt=""><br>前面说的是否 dynamic 就是在这里进行判断<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/E0ODcp.png" alt=""></p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// org.apache.ibatis.scripting.xmltags.XMLScriptBuilder#parseScriptNode</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> SqlSource <span class="title">parseScriptNode</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    MixedSqlNode rootSqlNode = parseDynamicTags(context);</span><br><span class="line">    SqlSource sqlSource;</span><br><span class="line">    <span class="keyword">if</span> (isDynamic) &#123;</span><br><span class="line">      sqlSource = <span class="keyword">new</span> DynamicSqlSource(configuration, rootSqlNode);</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">      sqlSource = <span class="keyword">new</span> RawSqlSource(configuration, rootSqlNode, parameterType);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> sqlSource;</span><br><span class="line">  &#125;</span><br><span class="line"><span class="comment">// org.apache.ibatis.scripting.xmltags.XMLScriptBuilder#parseDynamicTags</span></span><br><span class="line"><span class="function"><span class="keyword">protected</span> MixedSqlNode <span class="title">parseDynamicTags</span><span class="params">(XNode node)</span> </span>&#123;</span><br><span class="line">    List&lt;SqlNode&gt; contents = <span class="keyword">new</span> ArrayList&lt;&gt;();</span><br><span class="line">    NodeList children = node.getNode().getChildNodes();</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; children.getLength(); i++) &#123;</span><br><span class="line">      XNode child = node.newXNode(children.item(i));</span><br><span class="line">      <span class="keyword">if</span> (child.getNode().getNodeType() == Node.CDATA_SECTION_NODE || child.getNode().getNodeType() == Node.TEXT_NODE) &#123;</span><br><span class="line">        String data = child.getStringBody(<span class="string">""</span>);</span><br><span class="line">        TextSqlNode textSqlNode = <span class="keyword">new</span> TextSqlNode(data);</span><br><span class="line">        <span class="keyword">if</span> (textSqlNode.isDynamic()) &#123;</span><br><span class="line">          contents.add(textSqlNode);</span><br><span class="line">          isDynamic = <span class="keyword">true</span>;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">          contents.add(<span class="keyword">new</span> StaticTextSqlNode(data));</span><br><span class="line">        &#125;</span><br><span class="line">      &#125; <span class="keyword">else</span> <span class="keyword">if</span> (child.getNode().getNodeType() == Node.ELEMENT_NODE) &#123; <span class="comment">// issue #628</span></span><br><span class="line">        String nodeName = child.getNode().getNodeName();</span><br><span class="line">        NodeHandler handler = nodeHandlerMap.get(nodeName);</span><br><span class="line">        <span class="keyword">if</span> (handler == <span class="keyword">null</span>) &#123;</span><br><span class="line">          <span class="keyword">throw</span> <span class="keyword">new</span> BuilderException(<span class="string">"Unknown element &lt;"</span> + nodeName + <span class="string">"&gt; in SQL statement."</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        handler.handleNode(child, contents);</span><br><span class="line">        isDynamic = <span class="keyword">true</span>;</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">new</span> MixedSqlNode(contents);</span><br><span class="line">  &#125;</span><br><span class="line"><span class="comment">// org.apache.ibatis.scripting.xmltags.TextSqlNode#isDynamic</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">isDynamic</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    DynamicCheckerTokenParser checker = <span class="keyword">new</span> DynamicCheckerTokenParser();</span><br><span class="line">    GenericTokenParser parser = createParser(checker);</span><br><span class="line">    parser.parse(text);</span><br><span class="line">    <span class="keyword">return</span> checker.isDynamic();</span><br><span class="line">  &#125;</span><br><span class="line">    <span class="function"><span class="keyword">private</span> GenericTokenParser <span class="title">createParser</span><span class="params">(TokenHandler handler)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">new</span> GenericTokenParser(<span class="string">"$&#123;"</span>, <span class="string">"&#125;"</span>, handler);</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
-<p>可以看到其中一个条件就是是否有<code>${}</code>这种占位符，假如说上面的 sql 换成 <code>${}</code>，那么可以看到它会在这里创建一个 dynamicSqlSource,</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// org.apache.ibatis.scripting.xmltags.DynamicSqlSource</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DynamicSqlSource</span> <span class="keyword">implements</span> <span class="title">SqlSource</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Configuration configuration;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> SqlNode rootSqlNode;</span><br><span class="line"></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="title">DynamicSqlSource</span><span class="params">(Configuration configuration, SqlNode rootSqlNode)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.configuration = configuration;</span><br><span class="line">    <span class="keyword">this</span>.rootSqlNode = rootSqlNode;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> BoundSql <span class="title">getBoundSql</span><span class="params">(Object parameterObject)</span> </span>&#123;</span><br><span class="line">    DynamicContext context = <span class="keyword">new</span> DynamicContext(configuration, parameterObject);</span><br><span class="line">    rootSqlNode.apply(context);</span><br><span class="line">    SqlSourceBuilder sqlSourceParser = <span class="keyword">new</span> SqlSourceBuilder(configuration);</span><br><span class="line">    Class&lt;?&gt; parameterType = parameterObject == null ? Object.class : parameterObject.getClass();</span><br><span class="line">    SqlSource sqlSource = sqlSourceParser.parse(context.getSql(), parameterType, context.getBindings());</span><br><span class="line">    BoundSql boundSql = sqlSource.getBoundSql(parameterObject);</span><br><span class="line">    context.getBindings().forEach(boundSql::setAdditionalParameter);</span><br><span class="line">    <span class="keyword">return</span> boundSql;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>这里眼尖的同学可能就可以看出来了，RawSqlSource 在初始化的时候已经经过了 parse，把<code>#{}</code>替换成了<code>?</code>占位符，但是 DynamicSqlSource 并没有<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/dnZWP7.png" alt="">再看这个图，我们发现在这的时候还没有进行替换<br>然后往里跟<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/YGVD0P.png" alt="">好像是这里了<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/BWHuUO.png" alt=""><br>这里 rootSqlNode.apply 其实是一个对原来 sql 的解析结果的一个循环调用，不同类型的标签会构成不同的 node，像这里就是一个 textSqlNode<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/eTiQm6.png" alt=""><br>可以发现到这我们的 sql 已经被替换了，而且是直接作为 string 类型替换的，所以可以明白了这个问题所在，就是注入，不过细心的同学发现其实这里是有个<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/Cc4JPw.png" alt=""><br>理论上还是可以做过滤的，不过好像现在没用起来。<br>我们前面可以发现对于<code>#{}</code>是在启动扫描 mapper的 xml 文件就替换成了 <code>?</code>,然后是在什么时候变成实际的值的呢<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/fRHpNO.png" alt=""><br>发现到这的时候还是没有替换，其实说白了也就是 prepareStatement 那一套，<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/4tNU7f.png" alt=""><br>在这里进行替换，会拿到 org.apache.ibatis.mapping.ParameterMapping，然后进行替换，因为会带着类型信息，所以不用担心注入咯</p>
+          <h2 id="小工记三"><a href="#小工记三" class="headerlink" title="小工记三"></a>小工记三</h2><p>前面这两周周末也都去老丈人家帮忙了，上上周周六先是去了那个在装修的旧房子那，把三楼收拾了下，因为要搬进来住，来不及等二楼装修好，就要把三楼里的东西都整理干净，这个活感觉是比较 easy，原来是就准备把三楼当放东西仓储的地方了，我们乡下大部分三层楼都是这么用的，这次也是没办法，之前搬进来的木头什么的都搬出去，主要是这上面灰尘太多，后面清理鼻孔的时候都是黑色的了，把东西都搬出去以后主要是地还是很脏，就扫了地拖了地，因为是水泥地，灰尘又太多了，拖起来都是会灰尘扬起来，整个脱完了的确干净很多，然而这会就出了个大乌龙，我们清理的是三楼的西边一间，结果老丈人上来说要住东边那间的🤦‍♂️，不过其实西边的也得清理，因为还是要放被子什么的，不算是白费功夫，接着清理东边那间，之前这个房子做过群租房，里面有个高低铺的床，当时觉得可以用在放被子什么的就没扔，只是拆掉了放旁边，我们就把它擦干净了又装好，发现螺丝🔩少了几个，亘古不变的真理，拆了以后装要不就多几个要不就少几个，不是很牢靠，不过用来放放被子省得放地上总还是可以的，对了前面还做了个事情就是铺地毯，其实也不是地毯，就是类似于墙布雨篷布那种，别人不用了送给我们的，三楼水泥地也不会铺瓷砖地板了就放一下，干净好看点，不过大小不合适要裁一下，那把剪刀是真的太难用了，我手都要抽筋了，它就是刀口只有一小个点是能剪下来的，其他都是钝的，后来还是用刀片直接裁，铺好以后，真的感觉也不太一样了，焕然一新的感觉<br>差不多中午了就去吃饭了，之前两次是去了一家小饭店，还是还比较干净，但是店里菜不好吃，还死贵，这次去了一家小快餐店，口味好，便宜，味道是真的不错，带鱼跟黄鱼都好吃，一点都不腥，我对这类比较腥的鱼真的是很挑剔的，基本上除了家里做的很少吃外面的，那天抱着试试的态度吃了下，真的还不错，后来丈母娘说好像这家老板是给别人结婚喜事酒席当厨师的，怪不得做的好吃，其实本来是有一点小抗拒，怕不干净什么的，后来发现菜很好吃，而且可能是老丈人跟干活的师傅去吃的比较多，老板很客气，我们吃完饭，还给我们买了葡萄吃，不过这家店有一个槽点，就是饭比较不好吃，有时候会夹生，不过后面聊起来其实是这种小菜馆饭点的通病，烧的太早太多容易多出来浪费，烧的迟了不够吃，而且大的电饭锅比较不容易烧好。<br>下午前面还是在处理三楼的，窗户上各种钉子，实在是太多了，我后面在走廊上排了一排🤦‍♂️，有些是直接断了，有些是就撬了出来，感觉我在杭州租房也没有这样子各种钉钉子，挂下衣服什么的也不用这么多吧，比较不能理解，搞得到处都是钉子。那天我爸也去帮忙了，主要是在卫生间里做白缝，其实也是个技术活，印象中好像我小时候自己家里也做过这个事情，但是比较模糊了，后面我们三楼搞完了就去帮我爸了，前面是我老婆二爹在那先刷上白缝，这里叫白缝，有些考究的也叫美缝，就是瓷砖铺完之后的缝，如果不去弄的话，里面水泥的颜色就露出来了，而且容易渗水，所以就要用白水泥加胶水搅拌之后糊在缝上，但是也不是直接糊，先要把缝抠一抠，因为铺瓷砖的还不会仔细到每个缝里的水泥都是一样满，而且也需要一些空间糊上去，不然就太表面的一层很容易被水直接冲掉了，然后这次其实也不是用的白水泥，而是直接现成买来就已经配好的用来填缝的，兑水搅拌均匀就好了，后面就主要是我跟我爸在搞，那个时候真的觉得我实在是太胖了，蹲下去真的没一会就受不了了，膝盖什么的太难受了，后面我跪着刷，然后膝盖又疼，也是比较不容易，不过我爸动作很快，我中间跪累了休息一会，我爸就能搞一大片，后面其实我也没做多少（谦虚一下），总体来讲这次不是很累，就是蹲着跪着腿有点受不了，是应该好好减肥了。</p>
 
       
     </div>
@@ -422,7 +424,7 @@
   
   
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-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/08/30/%E8%BF%99%E5%91%A8%E6%9C%AB%E6%88%91%E5%8F%88%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/09/06/mybatis-%E7%9A%84-%E5%92%8C-%E6%98%AF%E6%9C%89%E5%95%A5%E5%8C%BA%E5%88%AB/">
 
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       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -436,7 +438,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2020/08/30/%E8%BF%99%E5%91%A8%E6%9C%AB%E6%88%91%E5%8F%88%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/" class="post-title-link" itemprop="url">这周末我又在老丈人家打了天小工</a>
+            <a href="/2020/09/06/mybatis-%E7%9A%84-%E5%92%8C-%E6%98%AF%E6%9C%89%E5%95%A5%E5%8C%BA%E5%88%AB/" class="post-title-link" itemprop="url">mybatis 的 $ 和 # 是有啥区别</a>
         </h2>
 
         <div class="post-meta">
@@ -447,7 +449,7 @@
               <span class="post-meta-item-text">Posted on</span>
               
 
-              <time title="Created: 2020-08-30 23:22:57 / Modified: 23:31:08" itemprop="dateCreated datePublished" datetime="2020-08-30T23:22:57+08:00">2020-08-30</time>
+              <time title="Created: 2020-09-06 23:14:50 / Modified: 23:18:32" itemprop="dateCreated datePublished" datetime="2020-09-06T23:14:50+08:00">2020-09-06</time>
             </span>
             <span class="post-meta-item">
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@@ -455,24 +457,32 @@
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
+                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/" itemprop="url" rel="index"><span itemprop="name">运动</span></a>
+                  <a href="/categories/Java/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/" itemprop="url" rel="index"><span itemprop="name">跑步</span></a>
+                  <a href="/categories/Mysql/" itemprop="url" rel="index"><span itemprop="name">Mysql</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/%E5%B9%B2%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">干活</span></a>
+                  <a href="/categories/Mysql/Sql%E6%B3%A8%E5%85%A5/" itemprop="url" rel="index"><span itemprop="name">Sql注入</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Spring/" itemprop="url" rel="index"><span itemprop="name">Spring</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Spring/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a>
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-            <span id="/2020/08/30/%E8%BF%99%E5%91%A8%E6%9C%AB%E6%88%91%E5%8F%88%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/" class="post-meta-item leancloud_visitors" data-flag-title="这周末我又在老丈人家打了天小工" title="Views">
+            <span id="/2020/09/06/mybatis-%E7%9A%84-%E5%92%8C-%E6%98%AF%E6%9C%89%E5%95%A5%E5%8C%BA%E5%88%AB/" class="post-meta-item leancloud_visitors" data-flag-title="mybatis 的 $ 和 # 是有啥区别" title="Views">
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@@ -487,8 +497,8 @@
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       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2020/08/30/%E8%BF%99%E5%91%A8%E6%9C%AB%E6%88%91%E5%8F%88%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/08/30/这周末我又在老丈人家打了天小工/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/09/06/mybatis-%E7%9A%84-%E5%92%8C-%E6%98%AF%E6%9C%89%E5%95%A5%E5%8C%BA%E5%88%AB/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/09/06/mybatis-的-和-是有啥区别/" itemprop="commentCount"></span>
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@@ -503,7 +513,11 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <p>因为活实在比较多，也不太好叫大工(活比较杂散)，相比上一次我跟 LD 俩人晚起了一点，我真的是只要有事，早上就醒的很早，准备八点出发的，六点就醒了，然后想继续睡就一直做梦🤦‍♂️，差不多八点半多到的丈人家，他们应该已经干了有一会了，我们到了以后就分配给我撬地板的活，上次说的那个敲掉柜子的房间里，还铺着质地还不错的木地板，但是也不想要了，得撬掉重新铺。<br>拿着撬棍和榔头就上楼去干了，浙江这几天的天气，最高温度一般 38、9，楼上那个房间也没风扇，有了也不能用，都是灰尘，撬了两下，我感觉我体内的水就像真气爆发一样变成汗炸了出来，眼睛全被汗糊住了，可能大部分人不太了解地板是怎么铺的，一般是在地面先铺一层混凝土，混凝土中间嵌进去规则的长条木条，然后真正的地板一块块的都是钉在那个木条上，用那种气枪钉和普通的钉子，并且块跟块之前还有一个木头的槽结构相互耦合，然后边缘的一圈在用较薄的木板将整个木地板封边(这些词都是我现造的)，边缘的用的钉子会更多，所以那几下真的很用力，而且撬地板，得蹲下起来，如此反复，对于我这个体重快超过身高的中年人来说的确是非常大的挑战，接下来继续撬了几个，已经有种要虚脱晕倒的感觉了，及时去喝水擦了汗，又歇了一会，为啥一上来就这么拼呢，主要是因为那个房间丈人在干活的时候是直接看得到的🤦‍♂️，后来被 LD 一顿教育，本来就是去帮忙的，又不是专业做这个的，急啥。<br>喝了水之后，又稍稍歇了一会，就开始继续撬了，本来觉得这个地板撬着好像还行，房间不大，没多久就撬完了，撬完之后喝了点饮料(补充点糖分，早餐吃得少，有点低血糖)，然后看到 LD 在撬下面的木条了，这个动作开始了那天最大的经验值收集行动，前面说了这个木条一般是跟混凝土一块铺上去的，但是谁也没想到，这个混凝土铺上去的时候竟然处理的这么随意，根本没考虑跟下面的贴合，所以撬木条的时候直接把木条跟木条中间大块大块的混凝土一块撬起来了，想想那重量，于是我这靠蛮力干活的，就用力把木条带着混凝土一块撬了起来，还沾沾自喜，但是发现结果是撬起来一块之后，体力值瞬间归零，上一篇我也提到了，其实干这类活也是很有技巧性的，但是上次的是我没学会，可能需要花时间学的，但是这次是LD 用她的纤细胳膊教会我的，我在撬的时候，屏住一口气，双手用力，起，大概是吃好几口奶的力气都用出来了，但是 LD 在我休息的时候，慢慢悠悠的，先把撬棍挤到木条或者混凝土跟下层的缝里，然后往下垫一小块混凝土碎石，然后轻轻松松的扳两下，就撬开了，亏我高中的时候引以为傲的物理成绩，作为物理课代表，这么浅显易懂的杠杆原理都完全不会用到生活里，后面在用这个技巧撬的过程中，真的觉得自己蠢到家了，当然在明白了用点杠杆原理之后，撬地板的活就变得慢慢悠悠，悠哉悠哉的了(其实还是很热的，披着毛巾擦眼睛)。<br>上午的活差不多完了，后面就是把撬出来的混凝土和地板条丢下去，地上铺着不用了的被子，然后就是午饭和午休环节了，午饭换了一家快餐，味道非常可以，下午的活就比较单调了，帮忙清理了上去扔下来的混凝土碎块跟木条，然后稍微打扫了下，老丈人就让我们回家了，接着上次说的，还是觉得比跑步啥的消耗大太多了，那汗流的，一口就能喝完一瓶 500 毫升左右的矿泉水。</p>
+          <p>这个问题也是面试中常被问到的，就抽空来了解下这个，跳过一大段前面初始化的逻辑，<br>对于一条<code>select * from t1 where id = #{id}</code>这样的 sql，在初始化扫描 mapper 的xml文件的时候会根据是否是 dynamic 来判断生成 DynamicSqlSource 还是 RawSqlSource，这里它是一条 RawSqlSource，<br>在这里做了替换，将<code>#{}</code>替换成了<code>?</code><br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/c84r0g.png" alt=""><br>前面说的是否 dynamic 就是在这里进行判断<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/E0ODcp.png" alt=""></p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// org.apache.ibatis.scripting.xmltags.XMLScriptBuilder#parseScriptNode</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> SqlSource <span class="title">parseScriptNode</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    MixedSqlNode rootSqlNode = parseDynamicTags(context);</span><br><span class="line">    SqlSource sqlSource;</span><br><span class="line">    <span class="keyword">if</span> (isDynamic) &#123;</span><br><span class="line">      sqlSource = <span class="keyword">new</span> DynamicSqlSource(configuration, rootSqlNode);</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">      sqlSource = <span class="keyword">new</span> RawSqlSource(configuration, rootSqlNode, parameterType);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> sqlSource;</span><br><span class="line">  &#125;</span><br><span class="line"><span class="comment">// org.apache.ibatis.scripting.xmltags.XMLScriptBuilder#parseDynamicTags</span></span><br><span class="line"><span class="function"><span class="keyword">protected</span> MixedSqlNode <span class="title">parseDynamicTags</span><span class="params">(XNode node)</span> </span>&#123;</span><br><span class="line">    List&lt;SqlNode&gt; contents = <span class="keyword">new</span> ArrayList&lt;&gt;();</span><br><span class="line">    NodeList children = node.getNode().getChildNodes();</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; children.getLength(); i++) &#123;</span><br><span class="line">      XNode child = node.newXNode(children.item(i));</span><br><span class="line">      <span class="keyword">if</span> (child.getNode().getNodeType() == Node.CDATA_SECTION_NODE || child.getNode().getNodeType() == Node.TEXT_NODE) &#123;</span><br><span class="line">        String data = child.getStringBody(<span class="string">""</span>);</span><br><span class="line">        TextSqlNode textSqlNode = <span class="keyword">new</span> TextSqlNode(data);</span><br><span class="line">        <span class="keyword">if</span> (textSqlNode.isDynamic()) &#123;</span><br><span class="line">          contents.add(textSqlNode);</span><br><span class="line">          isDynamic = <span class="keyword">true</span>;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">          contents.add(<span class="keyword">new</span> StaticTextSqlNode(data));</span><br><span class="line">        &#125;</span><br><span class="line">      &#125; <span class="keyword">else</span> <span class="keyword">if</span> (child.getNode().getNodeType() == Node.ELEMENT_NODE) &#123; <span class="comment">// issue #628</span></span><br><span class="line">        String nodeName = child.getNode().getNodeName();</span><br><span class="line">        NodeHandler handler = nodeHandlerMap.get(nodeName);</span><br><span class="line">        <span class="keyword">if</span> (handler == <span class="keyword">null</span>) &#123;</span><br><span class="line">          <span class="keyword">throw</span> <span class="keyword">new</span> BuilderException(<span class="string">"Unknown element &lt;"</span> + nodeName + <span class="string">"&gt; in SQL statement."</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        handler.handleNode(child, contents);</span><br><span class="line">        isDynamic = <span class="keyword">true</span>;</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">new</span> MixedSqlNode(contents);</span><br><span class="line">  &#125;</span><br><span class="line"><span class="comment">// org.apache.ibatis.scripting.xmltags.TextSqlNode#isDynamic</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">isDynamic</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    DynamicCheckerTokenParser checker = <span class="keyword">new</span> DynamicCheckerTokenParser();</span><br><span class="line">    GenericTokenParser parser = createParser(checker);</span><br><span class="line">    parser.parse(text);</span><br><span class="line">    <span class="keyword">return</span> checker.isDynamic();</span><br><span class="line">  &#125;</span><br><span class="line">    <span class="function"><span class="keyword">private</span> GenericTokenParser <span class="title">createParser</span><span class="params">(TokenHandler handler)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">new</span> GenericTokenParser(<span class="string">"$&#123;"</span>, <span class="string">"&#125;"</span>, handler);</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
+<p>可以看到其中一个条件就是是否有<code>${}</code>这种占位符，假如说上面的 sql 换成 <code>${}</code>，那么可以看到它会在这里创建一个 dynamicSqlSource,</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// org.apache.ibatis.scripting.xmltags.DynamicSqlSource</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DynamicSqlSource</span> <span class="keyword">implements</span> <span class="title">SqlSource</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> Configuration configuration;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">final</span> SqlNode rootSqlNode;</span><br><span class="line"></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="title">DynamicSqlSource</span><span class="params">(Configuration configuration, SqlNode rootSqlNode)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.configuration = configuration;</span><br><span class="line">    <span class="keyword">this</span>.rootSqlNode = rootSqlNode;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> BoundSql <span class="title">getBoundSql</span><span class="params">(Object parameterObject)</span> </span>&#123;</span><br><span class="line">    DynamicContext context = <span class="keyword">new</span> DynamicContext(configuration, parameterObject);</span><br><span class="line">    rootSqlNode.apply(context);</span><br><span class="line">    SqlSourceBuilder sqlSourceParser = <span class="keyword">new</span> SqlSourceBuilder(configuration);</span><br><span class="line">    Class&lt;?&gt; parameterType = parameterObject == null ? Object.class : parameterObject.getClass();</span><br><span class="line">    SqlSource sqlSource = sqlSourceParser.parse(context.getSql(), parameterType, context.getBindings());</span><br><span class="line">    BoundSql boundSql = sqlSource.getBoundSql(parameterObject);</span><br><span class="line">    context.getBindings().forEach(boundSql::setAdditionalParameter);</span><br><span class="line">    <span class="keyword">return</span> boundSql;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>这里眼尖的同学可能就可以看出来了，RawSqlSource 在初始化的时候已经经过了 parse，把<code>#{}</code>替换成了<code>?</code>占位符，但是 DynamicSqlSource 并没有<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/dnZWP7.png" alt="">再看这个图，我们发现在这的时候还没有进行替换<br>然后往里跟<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/YGVD0P.png" alt="">好像是这里了<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/BWHuUO.png" alt=""><br>这里 rootSqlNode.apply 其实是一个对原来 sql 的解析结果的一个循环调用，不同类型的标签会构成不同的 node，像这里就是一个 textSqlNode<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/eTiQm6.png" alt=""><br>可以发现到这我们的 sql 已经被替换了，而且是直接作为 string 类型替换的，所以可以明白了这个问题所在，就是注入，不过细心的同学发现其实这里是有个<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/Cc4JPw.png" alt=""><br>理论上还是可以做过滤的，不过好像现在没用起来。<br>我们前面可以发现对于<code>#{}</code>是在启动扫描 mapper的 xml 文件就替换成了 <code>?</code>,然后是在什么时候变成实际的值的呢<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/fRHpNO.png" alt=""><br>发现到这的时候还是没有替换，其实说白了也就是 prepareStatement 那一套，<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/4tNU7f.png" alt=""><br>在这里进行替换，会拿到 org.apache.ibatis.mapping.ParameterMapping，然后进行替换，因为会带着类型信息，所以不用担心注入咯</p>
 
       
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@@ -525,7 +539,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/08/22/Filter-Intercepter-Aop-%E5%95%A5-%E5%95%A5-%E5%95%A5-%E8%BF%99%E4%BA%9B%E9%83%BD%E6%98%AF%E5%95%A5/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/08/30/%E8%BF%99%E5%91%A8%E6%9C%AB%E6%88%91%E5%8F%88%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -539,7 +553,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2020/08/22/Filter-Intercepter-Aop-%E5%95%A5-%E5%95%A5-%E5%95%A5-%E8%BF%99%E4%BA%9B%E9%83%BD%E6%98%AF%E5%95%A5/" class="post-title-link" itemprop="url">Filter, Interceptor, Aop, 啥, 啥, 啥? 这些都是啥?</a>
+            <a href="/2020/08/30/%E8%BF%99%E5%91%A8%E6%9C%AB%E6%88%91%E5%8F%88%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/" class="post-title-link" itemprop="url">这周末我又在老丈人家打了天小工</a>
         </h2>
 
         <div class="post-meta">
@@ -548,52 +562,34 @@
                 <i class="far fa-calendar"></i>
               </span>
               <span class="post-meta-item-text">Posted on</span>
+              
 
-              <time title="Created: 2020-08-22 20:44:32" itemprop="dateCreated datePublished" datetime="2020-08-22T20:44:32+08:00">2020-08-22</time>
+              <time title="Created: 2020-08-30 23:22:57 / Modified: 23:31:08" itemprop="dateCreated datePublished" datetime="2020-08-30T23:22:57+08:00">2020-08-30</time>
             </span>
-              <span class="post-meta-item">
-                <span class="post-meta-item-icon">
-                  <i class="far fa-calendar-check"></i>
-                </span>
-                <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-08-23 23:10:23" itemprop="dateModified" datetime="2020-08-23T23:10:23+08:00">2020-08-23</time>
-              </span>
             <span class="post-meta-item">
               <span class="post-meta-item-icon">
                 <i class="far fa-folder"></i>
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Spring/" itemprop="url" rel="index"><span itemprop="name">Spring</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Filter/" itemprop="url" rel="index"><span itemprop="name">Filter</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Interceptor-AOP/" itemprop="url" rel="index"><span itemprop="name">Interceptor - AOP</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Spring/Servlet/" itemprop="url" rel="index"><span itemprop="name">Servlet</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/" itemprop="url" rel="index"><span itemprop="name">运动</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Spring/Servlet/Interceptor/" itemprop="url" rel="index"><span itemprop="name">Interceptor</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/" itemprop="url" rel="index"><span itemprop="name">跑步</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Spring/Servlet/Interceptor/AOP/" itemprop="url" rel="index"><span itemprop="name">AOP</span></a>
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/%E5%B9%B2%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">干活</span></a>
                 </span>
             </span>
 
           
-            <span id="/2020/08/22/Filter-Intercepter-Aop-%E5%95%A5-%E5%95%A5-%E5%95%A5-%E8%BF%99%E4%BA%9B%E9%83%BD%E6%98%AF%E5%95%A5/" class="post-meta-item leancloud_visitors" data-flag-title="Filter, Interceptor, Aop, 啥, 啥, 啥? 这些都是啥?" title="Views">
+            <span id="/2020/08/30/%E8%BF%99%E5%91%A8%E6%9C%AB%E6%88%91%E5%8F%88%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/" class="post-meta-item leancloud_visitors" data-flag-title="这周末我又在老丈人家打了天小工" title="Views">
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@@ -608,8 +604,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2020/08/22/Filter-Intercepter-Aop-%E5%95%A5-%E5%95%A5-%E5%95%A5-%E8%BF%99%E4%BA%9B%E9%83%BD%E6%98%AF%E5%95%A5/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/08/22/Filter-Intercepter-Aop-啥-啥-啥-这些都是啥/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/08/30/%E8%BF%99%E5%91%A8%E6%9C%AB%E6%88%91%E5%8F%88%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/08/30/这周末我又在老丈人家打了天小工/" itemprop="commentCount"></span>
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-          <p>本来是想取个像现在那些公众号转了又转的文章标题，”面试官再问你xxxxx，就把这篇文章甩给他看”这种标题，但是觉得实在太 low 了，还是用一部我比较喜欢的电影里的一句台词，《人在囧途》里王宝强对着那张老板给他的欠条，看不懂字时候说的那句，这些都是些啥（第四声）<br>当我刚开始面 Java 的时候，其实我真的没注意这方面的东西，实话说就是不知道这些是啥，开发中用过 Interceptor和 Aop，了解 aop 的实现原理，但是不知道 Java web 中的 Filter 是怎么回事，知道 dubbo 的 filter，就这样，所以被问到了的确是回答不出来，可能就觉得这个渣渣，这么简单的都不会，所以还是花点时间来看看这个是个啥，为了避免我口吐芬芳，还是耐下性子来简单说下这几个东西<br>首先是 servlet，怎么去解释这个呢，因为之前是 PHPer，所以比较喜欢用它来举例子，在普通的 PHP 的 web 应用中一般有几部分组成，接受 HTTP 请求的是前置的 nginx 或者 apache，但是这俩玩意都是只能处理静态的请求，远古时代 PHP 和 HTML 混编是通过 apache 的 php module，跟后来 nginx 使用 php-fpm 其实道理类似，就是把请求中需要 PHP 处理的转发给 PHP，在 Java 中呢，是有个比较牛叉的叫 Tomcat 的，它可以把请求转成 servlet，而 servlet 其实就是一种实现了特定接口的 Java 代码，</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span 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class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br><span class="line">159</span><br><span class="line">160</span><br><span class="line">161</span><br><span class="line">162</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="keyword">package</span> javax.servlet;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Defines methods that all servlets must implement.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * &lt;p&gt;</span></span><br><span class="line"><span class="comment"> * A servlet is a small Java program that runs within a Web server. Servlets</span></span><br><span class="line"><span class="comment"> * receive and respond to requests from Web clients, usually across HTTP, the</span></span><br><span class="line"><span class="comment"> * HyperText Transfer Protocol.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * &lt;p&gt;</span></span><br><span class="line"><span class="comment"> * To implement this interface, you can write a generic servlet that extends</span></span><br><span class="line"><span class="comment"> * &lt;code&gt;javax.servlet.GenericServlet&lt;/code&gt; or an HTTP servlet that extends</span></span><br><span class="line"><span class="comment"> * &lt;code&gt;javax.servlet.http.HttpServlet&lt;/code&gt;.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * &lt;p&gt;</span></span><br><span class="line"><span class="comment"> * This interface defines methods to initialize a servlet, to service requests,</span></span><br><span class="line"><span class="comment"> * and to remove a servlet from the server. These are known as life-cycle</span></span><br><span class="line"><span class="comment"> * methods and are called in the following sequence:</span></span><br><span class="line"><span class="comment"> * &lt;ol&gt;</span></span><br><span class="line"><span class="comment"> * &lt;li&gt;The servlet is constructed, then initialized with the &lt;code&gt;init&lt;/code&gt;</span></span><br><span class="line"><span class="comment"> * method.</span></span><br><span class="line"><span class="comment"> * &lt;li&gt;Any calls from clients to the &lt;code&gt;service&lt;/code&gt; method are handled.</span></span><br><span class="line"><span class="comment"> * &lt;li&gt;The servlet is taken out of service, then destroyed with the</span></span><br><span class="line"><span class="comment"> * &lt;code&gt;destroy&lt;/code&gt; method, then garbage collected and finalized.</span></span><br><span class="line"><span class="comment"> * &lt;/ol&gt;</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * &lt;p&gt;</span></span><br><span class="line"><span class="comment"> * In addition to the life-cycle methods, this interface provides the</span></span><br><span class="line"><span class="comment"> * &lt;code&gt;getServletConfig&lt;/code&gt; method, which the servlet can use to get any</span></span><br><span class="line"><span class="comment"> * startup information, and the &lt;code&gt;getServletInfo&lt;/code&gt; method, which allows</span></span><br><span class="line"><span class="comment"> * the servlet to return basic information about itself, such as author,</span></span><br><span class="line"><span class="comment"> * version, and copyright.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@see</span> GenericServlet</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@see</span> javax.servlet.http.HttpServlet</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Servlet</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * Called by the servlet container to indicate to a servlet that the servlet</span></span><br><span class="line"><span class="comment">     * is being placed into service.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * The servlet container calls the &lt;code&gt;init&lt;/code&gt; method exactly once</span></span><br><span class="line"><span class="comment">     * after instantiating the servlet. The &lt;code&gt;init&lt;/code&gt; method must</span></span><br><span class="line"><span class="comment">     * complete successfully before the servlet can receive any requests.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * The servlet container cannot place the servlet into service if the</span></span><br><span class="line"><span class="comment">     * &lt;code&gt;init&lt;/code&gt; method</span></span><br><span class="line"><span class="comment">     * &lt;ol&gt;</span></span><br><span class="line"><span class="comment">     * &lt;li&gt;Throws a &lt;code&gt;ServletException&lt;/code&gt;</span></span><br><span class="line"><span class="comment">     * &lt;li&gt;Does not return within a time period defined by the Web server</span></span><br><span class="line"><span class="comment">     * &lt;/ol&gt;</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> config</span></span><br><span class="line"><span class="comment">     *            a &lt;code&gt;ServletConfig&lt;/code&gt; object containing the servlet's</span></span><br><span class="line"><span class="comment">     *            configuration and initialization parameters</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@exception</span> ServletException</span></span><br><span class="line"><span class="comment">     *                if an exception has occurred that interferes with the</span></span><br><span class="line"><span class="comment">     *                servlet's normal operation</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@see</span> UnavailableException</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@see</span> #getServletConfig</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">init</span><span class="params">(ServletConfig config)</span> <span class="keyword">throws</span> ServletException</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * Returns a &#123;<span class="doctag">@link</span> ServletConfig&#125; object, which contains initialization and</span></span><br><span class="line"><span class="comment">     * startup parameters for this servlet. The &lt;code&gt;ServletConfig&lt;/code&gt;</span></span><br><span class="line"><span class="comment">     * object returned is the one passed to the &lt;code&gt;init&lt;/code&gt; method.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * Implementations of this interface are responsible for storing the</span></span><br><span class="line"><span class="comment">     * &lt;code&gt;ServletConfig&lt;/code&gt; object so that this method can return it. The</span></span><br><span class="line"><span class="comment">     * &#123;<span class="doctag">@link</span> GenericServlet&#125; class, which implements this interface, already</span></span><br><span class="line"><span class="comment">     * does this.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span> the &lt;code&gt;ServletConfig&lt;/code&gt; object that initializes this</span></span><br><span class="line"><span class="comment">     *         servlet</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@see</span> #init</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> ServletConfig <span class="title">getServletConfig</span><span class="params">()</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * Called by the servlet container to allow the servlet to respond to a</span></span><br><span class="line"><span class="comment">     * request.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * This method is only called after the servlet's &lt;code&gt;init()&lt;/code&gt; method</span></span><br><span class="line"><span class="comment">     * has completed successfully.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * The status code of the response always should be set for a servlet that</span></span><br><span class="line"><span class="comment">     * throws or sends an error.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * Servlets typically run inside multithreaded servlet containers that can</span></span><br><span class="line"><span class="comment">     * handle multiple requests concurrently. Developers must be aware to</span></span><br><span class="line"><span class="comment">     * synchronize access to any shared resources such as files, network</span></span><br><span class="line"><span class="comment">     * connections, and as well as the servlet's class and instance variables.</span></span><br><span class="line"><span class="comment">     * More information on multithreaded programming in Java is available in &lt;a</span></span><br><span class="line"><span class="comment">     * href</span></span><br><span class="line"><span class="comment">     * ="http://java.sun.com/Series/Tutorial/java/threads/multithreaded.html"&gt;</span></span><br><span class="line"><span class="comment">     * the Java tutorial on multi-threaded programming&lt;/a&gt;.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> req</span></span><br><span class="line"><span class="comment">     *            the &lt;code&gt;ServletRequest&lt;/code&gt; object that contains the</span></span><br><span class="line"><span class="comment">     *            client's request</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> res</span></span><br><span class="line"><span class="comment">     *            the &lt;code&gt;ServletResponse&lt;/code&gt; object that contains the</span></span><br><span class="line"><span class="comment">     *            servlet's response</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@exception</span> ServletException</span></span><br><span class="line"><span class="comment">     *                if an exception occurs that interferes with the servlet's</span></span><br><span class="line"><span class="comment">     *                normal operation</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@exception</span> IOException</span></span><br><span class="line"><span class="comment">     *                if an input or output exception occurs</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">service</span><span class="params">(ServletRequest req, ServletResponse res)</span></span></span><br><span class="line"><span class="function">            <span class="keyword">throws</span> ServletException, IOException</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * Returns information about the servlet, such as author, version, and</span></span><br><span class="line"><span class="comment">     * copyright.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * The string that this method returns should be plain text and not markup</span></span><br><span class="line"><span class="comment">     * of any kind (such as HTML, XML, etc.).</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span> a &lt;code&gt;String&lt;/code&gt; containing servlet information</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">getServletInfo</span><span class="params">()</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * Called by the servlet container to indicate to a servlet that the servlet</span></span><br><span class="line"><span class="comment">     * is being taken out of service. This method is only called once all</span></span><br><span class="line"><span class="comment">     * threads within the servlet's &lt;code&gt;service&lt;/code&gt; method have exited or</span></span><br><span class="line"><span class="comment">     * after a timeout period has passed. After the servlet container calls this</span></span><br><span class="line"><span class="comment">     * method, it will not call the &lt;code&gt;service&lt;/code&gt; method again on this</span></span><br><span class="line"><span class="comment">     * servlet.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * This method gives the servlet an opportunity to clean up any resources</span></span><br><span class="line"><span class="comment">     * that are being held (for example, memory, file handles, threads) and make</span></span><br><span class="line"><span class="comment">     * sure that any persistent state is synchronized with the servlet's current</span></span><br><span class="line"><span class="comment">     * state in memory.</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">destroy</span><span class="params">()</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>重点看 servlet 的 service方法，就是接受请求，处理完了给响应，不说细节，不然光 Tomcat 的能说半年，所以呢再进一步去理解，其实就能知道，就是一个先后的问题，盗个图<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/2451842-a95c4ece9b4d3833.png" alt=""><br>filter 跟后两者最大的不一样其实是一个基于 servlet，在非常外层做的处理，然后是 interceptor 的 prehandle 跟 posthandle，接着才是我们常规的 aop，就这么点事情，做个小试验吧(还是先补段代码吧)</p>
-<h2 id="Filter"><a href="#Filter" class="headerlink" title="Filter"></a>Filter</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// ---------------------------------------------------- FilterChain Methods</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * Invoke the next filter in this chain, passing the specified request</span></span><br><span class="line"><span class="comment">     * and response.  If there are no more filters in this chain, invoke</span></span><br><span class="line"><span class="comment">     * the &lt;code&gt;service()&lt;/code&gt; method of the servlet itself.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> request The servlet request we are processing</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> response The servlet response we are creating</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@exception</span> IOException if an input/output error occurs</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@exception</span> ServletException if a servlet exception occurs</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doFilter</span><span class="params">(ServletRequest request, ServletResponse response)</span></span></span><br><span class="line"><span class="function">        <span class="keyword">throws</span> IOException, ServletException </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span>( Globals.IS_SECURITY_ENABLED ) &#123;</span><br><span class="line">            <span class="keyword">final</span> ServletRequest req = request;</span><br><span class="line">            <span class="keyword">final</span> ServletResponse res = response;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                java.security.AccessController.doPrivileged(</span><br><span class="line">                    <span class="keyword">new</span> java.security.PrivilegedExceptionAction&lt;Void&gt;() &#123;</span><br><span class="line">                        <span class="meta">@Override</span></span><br><span class="line">                        <span class="function"><span class="keyword">public</span> Void <span class="title">run</span><span class="params">()</span></span></span><br><span class="line"><span class="function">                            <span class="keyword">throws</span> ServletException, IOException </span>&#123;</span><br><span class="line">                            internalDoFilter(req,res);</span><br><span class="line">                            <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line">                );</span><br><span class="line">            &#125; <span class="keyword">catch</span>( PrivilegedActionException pe) &#123;</span><br><span class="line">                Exception e = pe.getException();</span><br><span class="line">                <span class="keyword">if</span> (e <span class="keyword">instanceof</span> ServletException)</span><br><span class="line">                    <span class="keyword">throw</span> (ServletException) e;</span><br><span class="line">                <span class="keyword">else</span> <span class="keyword">if</span> (e <span class="keyword">instanceof</span> IOException)</span><br><span class="line">                    <span class="keyword">throw</span> (IOException) e;</span><br><span class="line">                <span class="keyword">else</span> <span class="keyword">if</span> (e <span class="keyword">instanceof</span> RuntimeException)</span><br><span class="line">                    <span class="keyword">throw</span> (RuntimeException) e;</span><br><span class="line">                <span class="keyword">else</span></span><br><span class="line">                    <span class="keyword">throw</span> <span class="keyword">new</span> ServletException(e.getMessage(), e);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            internalDoFilter(request,response);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">internalDoFilter</span><span class="params">(ServletRequest request,</span></span></span><br><span class="line"><span class="function"><span class="params">                                  ServletResponse response)</span></span></span><br><span class="line"><span class="function">        <span class="keyword">throws</span> IOException, ServletException </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// Call the next filter if there is one</span></span><br><span class="line">        <span class="keyword">if</span> (pos &lt; n) &#123;</span><br><span class="line">            ApplicationFilterConfig filterConfig = filters[pos++];</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                Filter filter = filterConfig.getFilter();</span><br><span class="line"></span><br><span class="line">                <span class="keyword">if</span> (request.isAsyncSupported() &amp;&amp; <span class="string">"false"</span>.equalsIgnoreCase(</span><br><span class="line">                        filterConfig.getFilterDef().getAsyncSupported())) &#123;</span><br><span class="line">                    request.setAttribute(Globals.ASYNC_SUPPORTED_ATTR, Boolean.FALSE);</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="keyword">if</span>( Globals.IS_SECURITY_ENABLED ) &#123;</span><br><span class="line">                    <span class="keyword">final</span> ServletRequest req = request;</span><br><span class="line">                    <span class="keyword">final</span> ServletResponse res = response;</span><br><span class="line">                    Principal principal =</span><br><span class="line">                        ((HttpServletRequest) req).getUserPrincipal();</span><br><span class="line"></span><br><span class="line">                    Object[] args = <span class="keyword">new</span> Object[]&#123;req, res, <span class="keyword">this</span>&#125;;</span><br><span class="line">                    SecurityUtil.doAsPrivilege (<span class="string">"doFilter"</span>, filter, classType, args, principal);</span><br><span class="line">                &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                    filter.doFilter(request, response, <span class="keyword">this</span>);</span><br><span class="line">                &#125;</span><br><span class="line">            &#125; <span class="keyword">catch</span> (IOException | ServletException | RuntimeException e) &#123;</span><br><span class="line">                <span class="keyword">throw</span> e;</span><br><span class="line">            &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line">                e = ExceptionUtils.unwrapInvocationTargetException(e);</span><br><span class="line">                ExceptionUtils.handleThrowable(e);</span><br><span class="line">                <span class="keyword">throw</span> <span class="keyword">new</span> ServletException(sm.getString(<span class="string">"filterChain.filter"</span>), e);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">return</span>;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// We fell off the end of the chain -- call the servlet instance</span></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="keyword">if</span> (ApplicationDispatcher.WRAP_SAME_OBJECT) &#123;</span><br><span class="line">                lastServicedRequest.set(request);</span><br><span class="line">                lastServicedResponse.set(response);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            <span class="keyword">if</span> (request.isAsyncSupported() &amp;&amp; !servletSupportsAsync) &#123;</span><br><span class="line">                request.setAttribute(Globals.ASYNC_SUPPORTED_ATTR,</span><br><span class="line">                        Boolean.FALSE);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="comment">// Use potentially wrapped request from this point</span></span><br><span class="line">            <span class="keyword">if</span> ((request <span class="keyword">instanceof</span> HttpServletRequest) &amp;&amp;</span><br><span class="line">                    (response <span class="keyword">instanceof</span> HttpServletResponse) &amp;&amp;</span><br><span class="line">                    Globals.IS_SECURITY_ENABLED ) &#123;</span><br><span class="line">                <span class="keyword">final</span> ServletRequest req = request;</span><br><span class="line">                <span class="keyword">final</span> ServletResponse res = response;</span><br><span class="line">                Principal principal =</span><br><span class="line">                    ((HttpServletRequest) req).getUserPrincipal();</span><br><span class="line">                Object[] args = <span class="keyword">new</span> Object[]&#123;req, res&#125;;</span><br><span class="line">                SecurityUtil.doAsPrivilege(<span class="string">"service"</span>,</span><br><span class="line">                                           servlet,</span><br><span class="line">                                           classTypeUsedInService,</span><br><span class="line">                                           args,</span><br><span class="line">                                           principal);</span><br><span class="line">            &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                servlet.service(request, response);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">catch</span> (IOException | ServletException | RuntimeException e) &#123;</span><br><span class="line">            <span class="keyword">throw</span> e;</span><br><span class="line">        &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line">            e = ExceptionUtils.unwrapInvocationTargetException(e);</span><br><span class="line">            ExceptionUtils.handleThrowable(e);</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> ServletException(sm.getString(<span class="string">"filterChain.servlet"</span>), e);</span><br><span class="line">        &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">            <span class="keyword">if</span> (ApplicationDispatcher.WRAP_SAME_OBJECT) &#123;</span><br><span class="line">                lastServicedRequest.set(<span class="keyword">null</span>);</span><br><span class="line">                lastServicedResponse.set(<span class="keyword">null</span>);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
-<p>注意看这一行<br><code>filter.doFilter(request, response, this);</code><br>是不是看懂了，就是个 filter 链，但是这个代码在哪呢，<code>org.apache.catalina.core.ApplicationFilterChain#doFilter</code><br>然后是interceptor，</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">doDispatch</span><span class="params">(HttpServletRequest request, HttpServletResponse response)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        HttpServletRequest processedRequest = request;</span><br><span class="line">        HandlerExecutionChain mappedHandler = <span class="keyword">null</span>;</span><br><span class="line">        <span class="keyword">boolean</span> multipartRequestParsed = <span class="keyword">false</span>;</span><br><span class="line">        WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                ModelAndView mv = <span class="keyword">null</span>;</span><br><span class="line">                Object dispatchException = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line">                <span class="keyword">try</span> &#123;</span><br><span class="line">                    processedRequest = <span class="keyword">this</span>.checkMultipart(request);</span><br><span class="line">                    multipartRequestParsed = processedRequest != request;</span><br><span class="line">                    mappedHandler = <span class="keyword">this</span>.getHandler(processedRequest);</span><br><span class="line">                    <span class="keyword">if</span> (mappedHandler == <span class="keyword">null</span>) &#123;</span><br><span class="line">                        <span class="keyword">this</span>.noHandlerFound(processedRequest, response);</span><br><span class="line">                        <span class="keyword">return</span>;</span><br><span class="line">                    &#125;</span><br><span class="line"></span><br><span class="line">                    HandlerAdapter ha = <span class="keyword">this</span>.getHandlerAdapter(mappedHandler.getHandler());</span><br><span class="line">                    String method = request.getMethod();</span><br><span class="line">                    <span class="keyword">boolean</span> isGet = <span class="string">"GET"</span>.equals(method);</span><br><span class="line">                    <span class="keyword">if</span> (isGet || <span class="string">"HEAD"</span>.equals(method)) &#123;</span><br><span class="line">                        <span class="keyword">long</span> lastModified = ha.getLastModified(request, mappedHandler.getHandler());</span><br><span class="line">                        <span class="keyword">if</span> ((<span class="keyword">new</span> ServletWebRequest(request, response)).checkNotModified(lastModified) &amp;&amp; isGet) &#123;</span><br><span class="line">                            <span class="keyword">return</span>;</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line"></span><br><span class="line">                    <span class="comment">/** </span></span><br><span class="line"><span class="comment">                     * 看这里看这里‼️</span></span><br><span class="line"><span class="comment">                     */</span></span><br><span class="line">                    <span class="keyword">if</span> (!mappedHandler.applyPreHandle(processedRequest, response)) &#123;</span><br><span class="line">                        <span class="keyword">return</span>;</span><br><span class="line">                    &#125;</span><br><span class="line"></span><br><span class="line">                    mv = ha.handle(processedRequest, response, mappedHandler.getHandler());</span><br><span class="line">                    <span class="keyword">if</span> (asyncManager.isConcurrentHandlingStarted()) &#123;</span><br><span class="line">                        <span class="keyword">return</span>;</span><br><span class="line">                    &#125;</span><br><span class="line"></span><br><span class="line">                    <span class="keyword">this</span>.applyDefaultViewName(processedRequest, mv);</span><br><span class="line">                    <span class="comment">/** </span></span><br><span class="line"><span class="comment">                     * 再看这里看这里‼️</span></span><br><span class="line"><span class="comment">                     */</span></span><br><span class="line">                    mappedHandler.applyPostHandle(processedRequest, response, mv);</span><br><span class="line">                &#125; <span class="keyword">catch</span> (Exception var20) &#123;</span><br><span class="line">                    dispatchException = var20;</span><br><span class="line">                &#125; <span class="keyword">catch</span> (Throwable var21) &#123;</span><br><span class="line">                    dispatchException = <span class="keyword">new</span> NestedServletException(<span class="string">"Handler dispatch failed"</span>, var21);</span><br><span class="line">                &#125;</span><br><span class="line"></span><br><span class="line">                <span class="keyword">this</span>.processDispatchResult(processedRequest, response, mappedHandler, mv, (Exception)dispatchException);</span><br><span class="line">            &#125; <span class="keyword">catch</span> (Exception var22) &#123;</span><br><span class="line">                <span class="keyword">this</span>.triggerAfterCompletion(processedRequest, response, mappedHandler, var22);</span><br><span class="line">            &#125; <span class="keyword">catch</span> (Throwable var23) &#123;</span><br><span class="line">                <span class="keyword">this</span>.triggerAfterCompletion(processedRequest, response, mappedHandler, <span class="keyword">new</span> NestedServletException(<span class="string">"Handler processing failed"</span>, var23));</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">        &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">            <span class="keyword">if</span> (asyncManager.isConcurrentHandlingStarted()) &#123;</span><br><span class="line">                <span class="keyword">if</span> (mappedHandler != <span class="keyword">null</span>) &#123;</span><br><span class="line">                    mappedHandler.applyAfterConcurrentHandlingStarted(processedRequest, response);</span><br><span class="line">                &#125;</span><br><span class="line">            &#125; <span class="keyword">else</span> <span class="keyword">if</span> (multipartRequestParsed) &#123;</span><br><span class="line">                <span class="keyword">this</span>.cleanupMultipart(processedRequest);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
-<p>代码在哪呢，<code>org.springframework.web.servlet.DispatcherServlet#doDispatch</code>，然后才是我们自己写的 aop，是不是差不多明白了，嗯，接下来是例子<br>写个 filter</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DemoFilter</span> <span class="keyword">extends</span> <span class="title">HttpServlet</span> <span class="keyword">implements</span> <span class="title">Filter</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">init</span><span class="params">(FilterConfig filterConfig)</span> <span class="keyword">throws</span> ServletException </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"==&gt;DemoFilter启动"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doFilter</span><span class="params">(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)</span> <span class="keyword">throws</span> IOException, ServletException </span>&#123;</span><br><span class="line">        <span class="comment">// 将请求转换成HttpServletRequest 请求</span></span><br><span class="line">        HttpServletRequest req = (HttpServletRequest) servletRequest;</span><br><span class="line">        HttpServletResponse resp = (HttpServletResponse) servletResponse;</span><br><span class="line">        System.out.println(<span class="string">"before filter"</span>);</span><br><span class="line">        filterChain.doFilter(req, resp);</span><br><span class="line">        System.out.println(<span class="string">"after filter"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">destroy</span><span class="params">()</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>因为用的springboot，所以就不写 web.xml 了，写个配置类</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">FilterConfiguration</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> FilterRegistrationBean <span class="title">filterDemo4Registration</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        FilterRegistrationBean registration = <span class="keyword">new</span> FilterRegistrationBean();</span><br><span class="line">        <span class="comment">//注入过滤器</span></span><br><span class="line">        registration.setFilter(<span class="keyword">new</span> DemoFilter());</span><br><span class="line">        <span class="comment">//拦截规则</span></span><br><span class="line">        registration.addUrlPatterns(<span class="string">"/*"</span>);</span><br><span class="line">        <span class="comment">//过滤器名称</span></span><br><span class="line">        registration.setName(<span class="string">"DemoFilter"</span>);</span><br><span class="line">        <span class="comment">//是否自动注册 false 取消Filter的自动注册</span></span><br><span class="line">        registration.setEnabled(<span class="keyword">true</span>);</span><br><span class="line">        <span class="comment">//过滤器顺序</span></span><br><span class="line">        registration.setOrder(<span class="number">1</span>);</span><br><span class="line">        <span class="keyword">return</span> registration;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>然后再来个 interceptor 和 aop,以及一个简单的请求处理</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DemoInterceptor</span> <span class="keyword">extends</span> <span class="title">HandlerInterceptorAdapter</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">preHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"preHandle test"</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">postHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"postHandle test"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="meta">@Aspect</span></span><br><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DemoAspect</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Pointcut</span>(<span class="string">"execution( public * com.nicksxs.springbootdemo.demo.DemoController.*())"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">point</span><span class="params">()</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Before</span>(<span class="string">"point()"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doBefore</span><span class="params">()</span></span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"==doBefore=="</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@After</span>(<span class="string">"point()"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doAfter</span><span class="params">()</span></span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"==doAfter=="</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="meta">@RestController</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DemoController</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@RequestMapping</span>(<span class="string">"/hello"</span>)</span><br><span class="line">    <span class="meta">@ResponseBody</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">hello</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">"hello world"</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-<p>好了，请求一下，看看 stdout，<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/pT4oXL.png" alt=""><br>搞定完事儿~</p>
+          <p>因为活实在比较多，也不太好叫大工(活比较杂散)，相比上一次我跟 LD 俩人晚起了一点，我真的是只要有事，早上就醒的很早，准备八点出发的，六点就醒了，然后想继续睡就一直做梦🤦‍♂️，差不多八点半多到的丈人家，他们应该已经干了有一会了，我们到了以后就分配给我撬地板的活，上次说的那个敲掉柜子的房间里，还铺着质地还不错的木地板，但是也不想要了，得撬掉重新铺。<br>拿着撬棍和榔头就上楼去干了，浙江这几天的天气，最高温度一般 38、9，楼上那个房间也没风扇，有了也不能用，都是灰尘，撬了两下，我感觉我体内的水就像真气爆发一样变成汗炸了出来，眼睛全被汗糊住了，可能大部分人不太了解地板是怎么铺的，一般是在地面先铺一层混凝土，混凝土中间嵌进去规则的长条木条，然后真正的地板一块块的都是钉在那个木条上，用那种气枪钉和普通的钉子，并且块跟块之前还有一个木头的槽结构相互耦合，然后边缘的一圈在用较薄的木板将整个木地板封边(这些词都是我现造的)，边缘的用的钉子会更多，所以那几下真的很用力，而且撬地板，得蹲下起来，如此反复，对于我这个体重快超过身高的中年人来说的确是非常大的挑战，接下来继续撬了几个，已经有种要虚脱晕倒的感觉了，及时去喝水擦了汗，又歇了一会，为啥一上来就这么拼呢，主要是因为那个房间丈人在干活的时候是直接看得到的🤦‍♂️，后来被 LD 一顿教育，本来就是去帮忙的，又不是专业做这个的，急啥。<br>喝了水之后，又稍稍歇了一会，就开始继续撬了，本来觉得这个地板撬着好像还行，房间不大，没多久就撬完了，撬完之后喝了点饮料(补充点糖分，早餐吃得少，有点低血糖)，然后看到 LD 在撬下面的木条了，这个动作开始了那天最大的经验值收集行动，前面说了这个木条一般是跟混凝土一块铺上去的，但是谁也没想到，这个混凝土铺上去的时候竟然处理的这么随意，根本没考虑跟下面的贴合，所以撬木条的时候直接把木条跟木条中间大块大块的混凝土一块撬起来了，想想那重量，于是我这靠蛮力干活的，就用力把木条带着混凝土一块撬了起来，还沾沾自喜，但是发现结果是撬起来一块之后，体力值瞬间归零，上一篇我也提到了，其实干这类活也是很有技巧性的，但是上次的是我没学会，可能需要花时间学的，但是这次是LD 用她的纤细胳膊教会我的，我在撬的时候，屏住一口气，双手用力，起，大概是吃好几口奶的力气都用出来了，但是 LD 在我休息的时候，慢慢悠悠的，先把撬棍挤到木条或者混凝土跟下层的缝里，然后往下垫一小块混凝土碎石，然后轻轻松松的扳两下，就撬开了，亏我高中的时候引以为傲的物理成绩，作为物理课代表，这么浅显易懂的杠杆原理都完全不会用到生活里，后面在用这个技巧撬的过程中，真的觉得自己蠢到家了，当然在明白了用点杠杆原理之后，撬地板的活就变得慢慢悠悠，悠哉悠哉的了(其实还是很热的，披着毛巾擦眼睛)。<br>上午的活差不多完了，后面就是把撬出来的混凝土和地板条丢下去，地上铺着不用了的被子，然后就是午饭和午休环节了，午饭换了一家快餐，味道非常可以，下午的活就比较单调了，帮忙清理了上去扔下来的混凝土碎块跟木条，然后稍微打扫了下，老丈人就让我们回家了，接着上次说的，还是觉得比跑步啥的消耗大太多了，那汗流的，一口就能喝完一瓶 500 毫升左右的矿泉水。</p>
 
       
     </div>
@@ -658,7 +642,7 @@
   
   
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/08/16/%E5%91%A8%E6%9C%AB%E6%88%91%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/08/22/Filter-Intercepter-Aop-%E5%95%A5-%E5%95%A5-%E5%95%A5-%E8%BF%99%E4%BA%9B%E9%83%BD%E6%98%AF%E5%95%A5/">
 
     <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
       <meta itemprop="image" content="/uploads/avatar.jpg">
@@ -672,7 +656,7 @@
       <header class="post-header">
         <h2 class="post-title" itemprop="name headline">
           
-            <a href="/2020/08/16/%E5%91%A8%E6%9C%AB%E6%88%91%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/" class="post-title-link" itemprop="url">周末我在老丈人家打了天小工</a>
+            <a href="/2020/08/22/Filter-Intercepter-Aop-%E5%95%A5-%E5%95%A5-%E5%95%A5-%E8%BF%99%E4%BA%9B%E9%83%BD%E6%98%AF%E5%95%A5/" class="post-title-link" itemprop="url">Filter, Interceptor, Aop, 啥, 啥, 啥? 这些都是啥?</a>
         </h2>
 
         <div class="post-meta">
@@ -681,34 +665,52 @@
                 <i class="far fa-calendar"></i>
               </span>
               <span class="post-meta-item-text">Posted on</span>
-              
 
-              <time title="Created: 2020-08-16 23:01:09 / Modified: 23:48:08" itemprop="dateCreated datePublished" datetime="2020-08-16T23:01:09+08:00">2020-08-16</time>
+              <time title="Created: 2020-08-22 20:44:32" itemprop="dateCreated datePublished" datetime="2020-08-22T20:44:32+08:00">2020-08-22</time>
             </span>
+              <span class="post-meta-item">
+                <span class="post-meta-item-icon">
+                  <i class="far fa-calendar-check"></i>
+                </span>
+                <span class="post-meta-item-text">Edited on</span>
+                <time title="Modified: 2020-08-23 23:10:23" itemprop="dateModified" datetime="2020-08-23T23:10:23+08:00">2020-08-23</time>
+              </span>
             <span class="post-meta-item">
               <span class="post-meta-item-icon">
                 <i class="far fa-folder"></i>
               </span>
               <span class="post-meta-item-text">In</span>
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
+                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/" itemprop="url" rel="index"><span itemprop="name">运动</span></a>
+                  <a href="/categories/Spring/" itemprop="url" rel="index"><span itemprop="name">Spring</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/" itemprop="url" rel="index"><span itemprop="name">跑步</span></a>
+                  <a href="/categories/Filter/" itemprop="url" rel="index"><span itemprop="name">Filter</span></a>
                 </span>
                   , 
                 <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/%E5%B9%B2%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">干活</span></a>
+                  <a href="/categories/Interceptor-AOP/" itemprop="url" rel="index"><span itemprop="name">Interceptor - AOP</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Spring/Servlet/" itemprop="url" rel="index"><span itemprop="name">Servlet</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Spring/Servlet/Interceptor/" itemprop="url" rel="index"><span itemprop="name">Interceptor</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Spring/Servlet/Interceptor/AOP/" itemprop="url" rel="index"><span itemprop="name">AOP</span></a>
                 </span>
             </span>
 
           
-            <span id="/2020/08/16/%E5%91%A8%E6%9C%AB%E6%88%91%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/" class="post-meta-item leancloud_visitors" data-flag-title="周末我在老丈人家打了天小工" title="Views">
+            <span id="/2020/08/22/Filter-Intercepter-Aop-%E5%95%A5-%E5%95%A5-%E5%95%A5-%E8%BF%99%E4%BA%9B%E9%83%BD%E6%98%AF%E5%95%A5/" class="post-meta-item leancloud_visitors" data-flag-title="Filter, Interceptor, Aop, 啥, 啥, 啥? 这些都是啥?" title="Views">
               <span class="post-meta-item-icon">
                 <i class="fa fa-eye"></i>
               </span>
@@ -723,8 +725,8 @@
       </span>
       <span class="post-meta-item-text">Disqus: </span>
     
-    <a title="disqus" href="/2020/08/16/%E5%91%A8%E6%9C%AB%E6%88%91%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/08/16/周末我在老丈人家打了天小工/" itemprop="commentCount"></span>
+    <a title="disqus" href="/2020/08/22/Filter-Intercepter-Aop-%E5%95%A5-%E5%95%A5-%E5%95%A5-%E8%BF%99%E4%BA%9B%E9%83%BD%E6%98%AF%E5%95%A5/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/08/22/Filter-Intercepter-Aop-啥-啥-啥-这些都是啥/" itemprop="commentCount"></span>
     </a>
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@@ -739,7 +741,19 @@
     <div class="post-body" itemprop="articleBody">
 
       
-          <p>这周回家提前约好了要去老丈人家帮下忙，因为在翻修下老房子，活不是特别整的那种，所以大部分都是自己干，或者找个大工临时干几天（我们这那种比较专业的泥工匠叫做大工），像我这样去帮忙的，就是干点小工（把给大工帮忙的，干些偏体力活的叫做小工）的活。从大学毕业以后真的蛮少帮家里干活了，以前上学的时候放假还是帮家里淘个米，简单的扫地拖地啥的，当然刚高考完的时候，还去我爸厂里帮忙干了几天的活，实在是比较累，不过现在想着是觉得自己那时候比较牛，而不是特别排斥这个活，相对于现在的工作来说，导致了一系列的职业病，颈椎腰背都很僵硬，眼镜也不好，还有反流，像我爸那种活反而是脑力加体力的比较好的结合。<br>这一天的活前半部分主要是在清理厨房，瓷砖上的油污和墙上天花板上即将脱落的石灰或者白色涂料层，这种活特别是瓷砖上的油污，之前在自己家里也干活，还是比较熟悉的，不过前面主要是LD 在干，我主要是先搞墙上和天花板上的，干活还是很需要技巧的，如果直接去铲，那基本我会变成一个灰人，而且吸一鼻子灰，老丈人比较专业，先接上软管用水冲，一冲效果特别好，有些石灰涂料层直接就冲掉了，冲完之后先用带加长杆的刀片铲铲了一圈墙面，说实话因为老房子之前租出去了，所以墙面什么的被糟蹋的比较难看，一层一层的，不过这还算还好，后面主要是天花板上的，这可难倒我了，从小我爸妈是比较把我当小孩管着，爬上爬下的基本都是我爸搞定，但是到了老丈人家也只得硬着头皮上了，爬到跳（一种建筑工地用的架子）上，还有点晃，小心脏扑通扑通跳，而且带加长杆的铲子还是比较重的，铲一会手也有点累，不过坚持着铲完了，上面还是比较平整的，不过下来的时候又把我难住了🤦‍♂️，往下爬的时候有根杆子要跨过去，由于裤子比较紧，强行一把跨过去怕抽筋，所以以一个非常尴尬的姿势停留休息了一会，再跨了过去，幸好事后问 LD，他们都没看到，哈哈哈，然后就是帮忙一起搞瓷砖上的油污，这个太有经验了，不过老丈人更有意思，一会试试啤酒，一会用用沙子，后面在午饭前基本就弄的比较干净了，就坐着等吃饭了，下午午休了会，就继续干活了。<br>下午是我这次体验的重点了，因为要清理以前贴的墙纸，真的是个很麻烦的活，只能说贴墙纸的师傅活干得太好了，基本不可能整个撕下来，想用铲子一点点铲下来也不行，太轻了就只铲掉表面一层，太重了就把墙纸跟墙面的石灰啥的整个铲下来了，而且手又累又酸，后来想着是不是继续用水冲一下，对着一小面墙试验了下，效果还不错，但是又发现了个问题，那一面墙又有一块是后面糊上去的，铲掉外层的石灰后不平，然后就是最最重头的，也是让我后遗症持续到第二天的，要把那一块糊上去的水泥敲下来，毛估下大概是敲了80%左右，剩下的我的手已经不会用力了，因为那一块应该是要糊上去的始作俑者，就一块里面凹进去的，我拿着榔头敲到我手已经没法使劲了，而且大下午，感觉没五分钟，我的汗已经糊满脸，眼睛也睁不开，不然就流到眼睛里了，此处获得成就一：用榔头敲墙壁，也是个技术加体力的活，而且需要非常好的技巧，否则手马上就废了，敲下去的反作用力，没一会就不行了，然后是看着老丈人兄弟帮忙拆一个柜子，在我看来是个几天都搞不定的活，他轻轻松松在我敲墙的那会就搞定了，以前总觉得我干的活非常有技术含量，可是这个事情真的也是很有技巧啊，它是个把一间房间分隔开的柜子，从底到顶上，还带着门，我还在旁边帮忙撬一下脚踢，一根木条撬半天，唉，成就二：专业的人就是不一样。<br>最后就是成就三了：我之前沾沾自喜的跑了多少步，做了什么锻炼，其实都是渣渣，像这样干一天活，没经历过的，基本大半天就废了，反过来说，如果能经常去这么干一天活，跑步啥的都是渣渣，消耗的能量远远超过跑个十公里啥的。</p>
+          <p>本来是想取个像现在那些公众号转了又转的文章标题，”面试官再问你xxxxx，就把这篇文章甩给他看”这种标题，但是觉得实在太 low 了，还是用一部我比较喜欢的电影里的一句台词，《人在囧途》里王宝强对着那张老板给他的欠条，看不懂字时候说的那句，这些都是些啥（第四声）<br>当我刚开始面 Java 的时候，其实我真的没注意这方面的东西，实话说就是不知道这些是啥，开发中用过 Interceptor和 Aop，了解 aop 的实现原理，但是不知道 Java web 中的 Filter 是怎么回事，知道 dubbo 的 filter，就这样，所以被问到了的确是回答不出来，可能就觉得这个渣渣，这么简单的都不会，所以还是花点时间来看看这个是个啥，为了避免我口吐芬芳，还是耐下性子来简单说下这几个东西<br>首先是 servlet，怎么去解释这个呢，因为之前是 PHPer，所以比较喜欢用它来举例子，在普通的 PHP 的 web 应用中一般有几部分组成，接受 HTTP 请求的是前置的 nginx 或者 apache，但是这俩玩意都是只能处理静态的请求，远古时代 PHP 和 HTML 混编是通过 apache 的 php module，跟后来 nginx 使用 php-fpm 其实道理类似，就是把请求中需要 PHP 处理的转发给 PHP，在 Java 中呢，是有个比较牛叉的叫 Tomcat 的，它可以把请求转成 servlet，而 servlet 其实就是一种实现了特定接口的 Java 代码，</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span 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class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br><span class="line">159</span><br><span class="line">160</span><br><span class="line">161</span><br><span class="line">162</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="keyword">package</span> javax.servlet;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Defines methods that all servlets must implement.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * &lt;p&gt;</span></span><br><span class="line"><span class="comment"> * A servlet is a small Java program that runs within a Web server. Servlets</span></span><br><span class="line"><span class="comment"> * receive and respond to requests from Web clients, usually across HTTP, the</span></span><br><span class="line"><span class="comment"> * HyperText Transfer Protocol.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * &lt;p&gt;</span></span><br><span class="line"><span class="comment"> * To implement this interface, you can write a generic servlet that extends</span></span><br><span class="line"><span class="comment"> * &lt;code&gt;javax.servlet.GenericServlet&lt;/code&gt; or an HTTP servlet that extends</span></span><br><span class="line"><span class="comment"> * &lt;code&gt;javax.servlet.http.HttpServlet&lt;/code&gt;.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * &lt;p&gt;</span></span><br><span class="line"><span class="comment"> * This interface defines methods to initialize a servlet, to service requests,</span></span><br><span class="line"><span class="comment"> * and to remove a servlet from the server. These are known as life-cycle</span></span><br><span class="line"><span class="comment"> * methods and are called in the following sequence:</span></span><br><span class="line"><span class="comment"> * &lt;ol&gt;</span></span><br><span class="line"><span class="comment"> * &lt;li&gt;The servlet is constructed, then initialized with the &lt;code&gt;init&lt;/code&gt;</span></span><br><span class="line"><span class="comment"> * method.</span></span><br><span class="line"><span class="comment"> * &lt;li&gt;Any calls from clients to the &lt;code&gt;service&lt;/code&gt; method are handled.</span></span><br><span class="line"><span class="comment"> * &lt;li&gt;The servlet is taken out of service, then destroyed with the</span></span><br><span class="line"><span class="comment"> * &lt;code&gt;destroy&lt;/code&gt; method, then garbage collected and finalized.</span></span><br><span class="line"><span class="comment"> * &lt;/ol&gt;</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * &lt;p&gt;</span></span><br><span class="line"><span class="comment"> * In addition to the life-cycle methods, this interface provides the</span></span><br><span class="line"><span class="comment"> * &lt;code&gt;getServletConfig&lt;/code&gt; method, which the servlet can use to get any</span></span><br><span class="line"><span class="comment"> * startup information, and the &lt;code&gt;getServletInfo&lt;/code&gt; method, which allows</span></span><br><span class="line"><span class="comment"> * the servlet to return basic information about itself, such as author,</span></span><br><span class="line"><span class="comment"> * version, and copyright.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@see</span> GenericServlet</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@see</span> javax.servlet.http.HttpServlet</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Servlet</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * Called by the servlet container to indicate to a servlet that the servlet</span></span><br><span class="line"><span class="comment">     * is being placed into service.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * The servlet container calls the &lt;code&gt;init&lt;/code&gt; method exactly once</span></span><br><span class="line"><span class="comment">     * after instantiating the servlet. The &lt;code&gt;init&lt;/code&gt; method must</span></span><br><span class="line"><span class="comment">     * complete successfully before the servlet can receive any requests.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * The servlet container cannot place the servlet into service if the</span></span><br><span class="line"><span class="comment">     * &lt;code&gt;init&lt;/code&gt; method</span></span><br><span class="line"><span class="comment">     * &lt;ol&gt;</span></span><br><span class="line"><span class="comment">     * &lt;li&gt;Throws a &lt;code&gt;ServletException&lt;/code&gt;</span></span><br><span class="line"><span class="comment">     * &lt;li&gt;Does not return within a time period defined by the Web server</span></span><br><span class="line"><span class="comment">     * &lt;/ol&gt;</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> config</span></span><br><span class="line"><span class="comment">     *            a &lt;code&gt;ServletConfig&lt;/code&gt; object containing the servlet's</span></span><br><span class="line"><span class="comment">     *            configuration and initialization parameters</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@exception</span> ServletException</span></span><br><span class="line"><span class="comment">     *                if an exception has occurred that interferes with the</span></span><br><span class="line"><span class="comment">     *                servlet's normal operation</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@see</span> UnavailableException</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@see</span> #getServletConfig</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">init</span><span class="params">(ServletConfig config)</span> <span class="keyword">throws</span> ServletException</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * Returns a &#123;<span class="doctag">@link</span> ServletConfig&#125; object, which contains initialization and</span></span><br><span class="line"><span class="comment">     * startup parameters for this servlet. The &lt;code&gt;ServletConfig&lt;/code&gt;</span></span><br><span class="line"><span class="comment">     * object returned is the one passed to the &lt;code&gt;init&lt;/code&gt; method.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * Implementations of this interface are responsible for storing the</span></span><br><span class="line"><span class="comment">     * &lt;code&gt;ServletConfig&lt;/code&gt; object so that this method can return it. The</span></span><br><span class="line"><span class="comment">     * &#123;<span class="doctag">@link</span> GenericServlet&#125; class, which implements this interface, already</span></span><br><span class="line"><span class="comment">     * does this.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span> the &lt;code&gt;ServletConfig&lt;/code&gt; object that initializes this</span></span><br><span class="line"><span class="comment">     *         servlet</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@see</span> #init</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> ServletConfig <span class="title">getServletConfig</span><span class="params">()</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * Called by the servlet container to allow the servlet to respond to a</span></span><br><span class="line"><span class="comment">     * request.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * This method is only called after the servlet's &lt;code&gt;init()&lt;/code&gt; method</span></span><br><span class="line"><span class="comment">     * has completed successfully.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * The status code of the response always should be set for a servlet that</span></span><br><span class="line"><span class="comment">     * throws or sends an error.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * Servlets typically run inside multithreaded servlet containers that can</span></span><br><span class="line"><span class="comment">     * handle multiple requests concurrently. Developers must be aware to</span></span><br><span class="line"><span class="comment">     * synchronize access to any shared resources such as files, network</span></span><br><span class="line"><span class="comment">     * connections, and as well as the servlet's class and instance variables.</span></span><br><span class="line"><span class="comment">     * More information on multithreaded programming in Java is available in &lt;a</span></span><br><span class="line"><span class="comment">     * href</span></span><br><span class="line"><span class="comment">     * ="http://java.sun.com/Series/Tutorial/java/threads/multithreaded.html"&gt;</span></span><br><span class="line"><span class="comment">     * the Java tutorial on multi-threaded programming&lt;/a&gt;.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> req</span></span><br><span class="line"><span class="comment">     *            the &lt;code&gt;ServletRequest&lt;/code&gt; object that contains the</span></span><br><span class="line"><span class="comment">     *            client's request</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> res</span></span><br><span class="line"><span class="comment">     *            the &lt;code&gt;ServletResponse&lt;/code&gt; object that contains the</span></span><br><span class="line"><span class="comment">     *            servlet's response</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@exception</span> ServletException</span></span><br><span class="line"><span class="comment">     *                if an exception occurs that interferes with the servlet's</span></span><br><span class="line"><span class="comment">     *                normal operation</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@exception</span> IOException</span></span><br><span class="line"><span class="comment">     *                if an input or output exception occurs</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">service</span><span class="params">(ServletRequest req, ServletResponse res)</span></span></span><br><span class="line"><span class="function">            <span class="keyword">throws</span> ServletException, IOException</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * Returns information about the servlet, such as author, version, and</span></span><br><span class="line"><span class="comment">     * copyright.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * The string that this method returns should be plain text and not markup</span></span><br><span class="line"><span class="comment">     * of any kind (such as HTML, XML, etc.).</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span> a &lt;code&gt;String&lt;/code&gt; containing servlet information</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">getServletInfo</span><span class="params">()</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * Called by the servlet container to indicate to a servlet that the servlet</span></span><br><span class="line"><span class="comment">     * is being taken out of service. This method is only called once all</span></span><br><span class="line"><span class="comment">     * threads within the servlet's &lt;code&gt;service&lt;/code&gt; method have exited or</span></span><br><span class="line"><span class="comment">     * after a timeout period has passed. After the servlet container calls this</span></span><br><span class="line"><span class="comment">     * method, it will not call the &lt;code&gt;service&lt;/code&gt; method again on this</span></span><br><span class="line"><span class="comment">     * servlet.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * &lt;p&gt;</span></span><br><span class="line"><span class="comment">     * This method gives the servlet an opportunity to clean up any resources</span></span><br><span class="line"><span class="comment">     * that are being held (for example, memory, file handles, threads) and make</span></span><br><span class="line"><span class="comment">     * sure that any persistent state is synchronized with the servlet's current</span></span><br><span class="line"><span class="comment">     * state in memory.</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">destroy</span><span class="params">()</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>重点看 servlet 的 service方法，就是接受请求，处理完了给响应，不说细节，不然光 Tomcat 的能说半年，所以呢再进一步去理解，其实就能知道，就是一个先后的问题，盗个图<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/2451842-a95c4ece9b4d3833.png" alt=""><br>filter 跟后两者最大的不一样其实是一个基于 servlet，在非常外层做的处理，然后是 interceptor 的 prehandle 跟 posthandle，接着才是我们常规的 aop，就这么点事情，做个小试验吧(还是先补段代码吧)</p>
+<h2 id="Filter"><a href="#Filter" class="headerlink" title="Filter"></a>Filter</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// ---------------------------------------------------- FilterChain Methods</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * Invoke the next filter in this chain, passing the specified request</span></span><br><span class="line"><span class="comment">     * and response.  If there are no more filters in this chain, invoke</span></span><br><span class="line"><span class="comment">     * the &lt;code&gt;service()&lt;/code&gt; method of the servlet itself.</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> request The servlet request we are processing</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> response The servlet response we are creating</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@exception</span> IOException if an input/output error occurs</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@exception</span> ServletException if a servlet exception occurs</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doFilter</span><span class="params">(ServletRequest request, ServletResponse response)</span></span></span><br><span class="line"><span class="function">        <span class="keyword">throws</span> IOException, ServletException </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span>( Globals.IS_SECURITY_ENABLED ) &#123;</span><br><span class="line">            <span class="keyword">final</span> ServletRequest req = request;</span><br><span class="line">            <span class="keyword">final</span> ServletResponse res = response;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                java.security.AccessController.doPrivileged(</span><br><span class="line">                    <span class="keyword">new</span> java.security.PrivilegedExceptionAction&lt;Void&gt;() &#123;</span><br><span class="line">                        <span class="meta">@Override</span></span><br><span class="line">                        <span class="function"><span class="keyword">public</span> Void <span class="title">run</span><span class="params">()</span></span></span><br><span class="line"><span class="function">                            <span class="keyword">throws</span> ServletException, IOException </span>&#123;</span><br><span class="line">                            internalDoFilter(req,res);</span><br><span class="line">                            <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line">                );</span><br><span class="line">            &#125; <span class="keyword">catch</span>( PrivilegedActionException pe) &#123;</span><br><span class="line">                Exception e = pe.getException();</span><br><span class="line">                <span class="keyword">if</span> (e <span class="keyword">instanceof</span> ServletException)</span><br><span class="line">                    <span class="keyword">throw</span> (ServletException) e;</span><br><span class="line">                <span class="keyword">else</span> <span class="keyword">if</span> (e <span class="keyword">instanceof</span> IOException)</span><br><span class="line">                    <span class="keyword">throw</span> (IOException) e;</span><br><span class="line">                <span class="keyword">else</span> <span class="keyword">if</span> (e <span class="keyword">instanceof</span> RuntimeException)</span><br><span class="line">                    <span class="keyword">throw</span> (RuntimeException) e;</span><br><span class="line">                <span class="keyword">else</span></span><br><span class="line">                    <span class="keyword">throw</span> <span class="keyword">new</span> ServletException(e.getMessage(), e);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            internalDoFilter(request,response);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">internalDoFilter</span><span class="params">(ServletRequest request,</span></span></span><br><span class="line"><span class="function"><span class="params">                                  ServletResponse response)</span></span></span><br><span class="line"><span class="function">        <span class="keyword">throws</span> IOException, ServletException </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// Call the next filter if there is one</span></span><br><span class="line">        <span class="keyword">if</span> (pos &lt; n) &#123;</span><br><span class="line">            ApplicationFilterConfig filterConfig = filters[pos++];</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                Filter filter = filterConfig.getFilter();</span><br><span class="line"></span><br><span class="line">                <span class="keyword">if</span> (request.isAsyncSupported() &amp;&amp; <span class="string">"false"</span>.equalsIgnoreCase(</span><br><span class="line">                        filterConfig.getFilterDef().getAsyncSupported())) &#123;</span><br><span class="line">                    request.setAttribute(Globals.ASYNC_SUPPORTED_ATTR, Boolean.FALSE);</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="keyword">if</span>( Globals.IS_SECURITY_ENABLED ) &#123;</span><br><span class="line">                    <span class="keyword">final</span> ServletRequest req = request;</span><br><span class="line">                    <span class="keyword">final</span> ServletResponse res = response;</span><br><span class="line">                    Principal principal =</span><br><span class="line">                        ((HttpServletRequest) req).getUserPrincipal();</span><br><span class="line"></span><br><span class="line">                    Object[] args = <span class="keyword">new</span> Object[]&#123;req, res, <span class="keyword">this</span>&#125;;</span><br><span class="line">                    SecurityUtil.doAsPrivilege (<span class="string">"doFilter"</span>, filter, classType, args, principal);</span><br><span class="line">                &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                    filter.doFilter(request, response, <span class="keyword">this</span>);</span><br><span class="line">                &#125;</span><br><span class="line">            &#125; <span class="keyword">catch</span> (IOException | ServletException | RuntimeException e) &#123;</span><br><span class="line">                <span class="keyword">throw</span> e;</span><br><span class="line">            &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line">                e = ExceptionUtils.unwrapInvocationTargetException(e);</span><br><span class="line">                ExceptionUtils.handleThrowable(e);</span><br><span class="line">                <span class="keyword">throw</span> <span class="keyword">new</span> ServletException(sm.getString(<span class="string">"filterChain.filter"</span>), e);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">return</span>;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// We fell off the end of the chain -- call the servlet instance</span></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="keyword">if</span> (ApplicationDispatcher.WRAP_SAME_OBJECT) &#123;</span><br><span class="line">                lastServicedRequest.set(request);</span><br><span class="line">                lastServicedResponse.set(response);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            <span class="keyword">if</span> (request.isAsyncSupported() &amp;&amp; !servletSupportsAsync) &#123;</span><br><span class="line">                request.setAttribute(Globals.ASYNC_SUPPORTED_ATTR,</span><br><span class="line">                        Boolean.FALSE);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="comment">// Use potentially wrapped request from this point</span></span><br><span class="line">            <span class="keyword">if</span> ((request <span class="keyword">instanceof</span> HttpServletRequest) &amp;&amp;</span><br><span class="line">                    (response <span class="keyword">instanceof</span> HttpServletResponse) &amp;&amp;</span><br><span class="line">                    Globals.IS_SECURITY_ENABLED ) &#123;</span><br><span class="line">                <span class="keyword">final</span> ServletRequest req = request;</span><br><span class="line">                <span class="keyword">final</span> ServletResponse res = response;</span><br><span class="line">                Principal principal =</span><br><span class="line">                    ((HttpServletRequest) req).getUserPrincipal();</span><br><span class="line">                Object[] args = <span class="keyword">new</span> Object[]&#123;req, res&#125;;</span><br><span class="line">                SecurityUtil.doAsPrivilege(<span class="string">"service"</span>,</span><br><span class="line">                                           servlet,</span><br><span class="line">                                           classTypeUsedInService,</span><br><span class="line">                                           args,</span><br><span class="line">                                           principal);</span><br><span class="line">            &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                servlet.service(request, response);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">catch</span> (IOException | ServletException | RuntimeException e) &#123;</span><br><span class="line">            <span class="keyword">throw</span> e;</span><br><span class="line">        &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line">            e = ExceptionUtils.unwrapInvocationTargetException(e);</span><br><span class="line">            ExceptionUtils.handleThrowable(e);</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> ServletException(sm.getString(<span class="string">"filterChain.servlet"</span>), e);</span><br><span class="line">        &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">            <span class="keyword">if</span> (ApplicationDispatcher.WRAP_SAME_OBJECT) &#123;</span><br><span class="line">                lastServicedRequest.set(<span class="keyword">null</span>);</span><br><span class="line">                lastServicedResponse.set(<span class="keyword">null</span>);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
+<p>注意看这一行<br><code>filter.doFilter(request, response, this);</code><br>是不是看懂了，就是个 filter 链，但是这个代码在哪呢，<code>org.apache.catalina.core.ApplicationFilterChain#doFilter</code><br>然后是interceptor，</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">doDispatch</span><span class="params">(HttpServletRequest request, HttpServletResponse response)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        HttpServletRequest processedRequest = request;</span><br><span class="line">        HandlerExecutionChain mappedHandler = <span class="keyword">null</span>;</span><br><span class="line">        <span class="keyword">boolean</span> multipartRequestParsed = <span class="keyword">false</span>;</span><br><span class="line">        WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                ModelAndView mv = <span class="keyword">null</span>;</span><br><span class="line">                Object dispatchException = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line">                <span class="keyword">try</span> &#123;</span><br><span class="line">                    processedRequest = <span class="keyword">this</span>.checkMultipart(request);</span><br><span class="line">                    multipartRequestParsed = processedRequest != request;</span><br><span class="line">                    mappedHandler = <span class="keyword">this</span>.getHandler(processedRequest);</span><br><span class="line">                    <span class="keyword">if</span> (mappedHandler == <span class="keyword">null</span>) &#123;</span><br><span class="line">                        <span class="keyword">this</span>.noHandlerFound(processedRequest, response);</span><br><span class="line">                        <span class="keyword">return</span>;</span><br><span class="line">                    &#125;</span><br><span class="line"></span><br><span class="line">                    HandlerAdapter ha = <span class="keyword">this</span>.getHandlerAdapter(mappedHandler.getHandler());</span><br><span class="line">                    String method = request.getMethod();</span><br><span class="line">                    <span class="keyword">boolean</span> isGet = <span class="string">"GET"</span>.equals(method);</span><br><span class="line">                    <span class="keyword">if</span> (isGet || <span class="string">"HEAD"</span>.equals(method)) &#123;</span><br><span class="line">                        <span class="keyword">long</span> lastModified = ha.getLastModified(request, mappedHandler.getHandler());</span><br><span class="line">                        <span class="keyword">if</span> ((<span class="keyword">new</span> ServletWebRequest(request, response)).checkNotModified(lastModified) &amp;&amp; isGet) &#123;</span><br><span class="line">                            <span class="keyword">return</span>;</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line"></span><br><span class="line">                    <span class="comment">/** </span></span><br><span class="line"><span class="comment">                     * 看这里看这里‼️</span></span><br><span class="line"><span class="comment">                     */</span></span><br><span class="line">                    <span class="keyword">if</span> (!mappedHandler.applyPreHandle(processedRequest, response)) &#123;</span><br><span class="line">                        <span class="keyword">return</span>;</span><br><span class="line">                    &#125;</span><br><span class="line"></span><br><span class="line">                    mv = ha.handle(processedRequest, response, mappedHandler.getHandler());</span><br><span class="line">                    <span class="keyword">if</span> (asyncManager.isConcurrentHandlingStarted()) &#123;</span><br><span class="line">                        <span class="keyword">return</span>;</span><br><span class="line">                    &#125;</span><br><span class="line"></span><br><span class="line">                    <span class="keyword">this</span>.applyDefaultViewName(processedRequest, mv);</span><br><span class="line">                    <span class="comment">/** </span></span><br><span class="line"><span class="comment">                     * 再看这里看这里‼️</span></span><br><span class="line"><span class="comment">                     */</span></span><br><span class="line">                    mappedHandler.applyPostHandle(processedRequest, response, mv);</span><br><span class="line">                &#125; <span class="keyword">catch</span> (Exception var20) &#123;</span><br><span class="line">                    dispatchException = var20;</span><br><span class="line">                &#125; <span class="keyword">catch</span> (Throwable var21) &#123;</span><br><span class="line">                    dispatchException = <span class="keyword">new</span> NestedServletException(<span class="string">"Handler dispatch failed"</span>, var21);</span><br><span class="line">                &#125;</span><br><span class="line"></span><br><span class="line">                <span class="keyword">this</span>.processDispatchResult(processedRequest, response, mappedHandler, mv, (Exception)dispatchException);</span><br><span class="line">            &#125; <span class="keyword">catch</span> (Exception var22) &#123;</span><br><span class="line">                <span class="keyword">this</span>.triggerAfterCompletion(processedRequest, response, mappedHandler, var22);</span><br><span class="line">            &#125; <span class="keyword">catch</span> (Throwable var23) &#123;</span><br><span class="line">                <span class="keyword">this</span>.triggerAfterCompletion(processedRequest, response, mappedHandler, <span class="keyword">new</span> NestedServletException(<span class="string">"Handler processing failed"</span>, var23));</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">        &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">            <span class="keyword">if</span> (asyncManager.isConcurrentHandlingStarted()) &#123;</span><br><span class="line">                <span class="keyword">if</span> (mappedHandler != <span class="keyword">null</span>) &#123;</span><br><span class="line">                    mappedHandler.applyAfterConcurrentHandlingStarted(processedRequest, response);</span><br><span class="line">                &#125;</span><br><span class="line">            &#125; <span class="keyword">else</span> <span class="keyword">if</span> (multipartRequestParsed) &#123;</span><br><span class="line">                <span class="keyword">this</span>.cleanupMultipart(processedRequest);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
+<p>代码在哪呢，<code>org.springframework.web.servlet.DispatcherServlet#doDispatch</code>，然后才是我们自己写的 aop，是不是差不多明白了，嗯，接下来是例子<br>写个 filter</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DemoFilter</span> <span class="keyword">extends</span> <span class="title">HttpServlet</span> <span class="keyword">implements</span> <span class="title">Filter</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">init</span><span class="params">(FilterConfig filterConfig)</span> <span class="keyword">throws</span> ServletException </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"==&gt;DemoFilter启动"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doFilter</span><span class="params">(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)</span> <span class="keyword">throws</span> IOException, ServletException </span>&#123;</span><br><span class="line">        <span class="comment">// 将请求转换成HttpServletRequest 请求</span></span><br><span class="line">        HttpServletRequest req = (HttpServletRequest) servletRequest;</span><br><span class="line">        HttpServletResponse resp = (HttpServletResponse) servletResponse;</span><br><span class="line">        System.out.println(<span class="string">"before filter"</span>);</span><br><span class="line">        filterChain.doFilter(req, resp);</span><br><span class="line">        System.out.println(<span class="string">"after filter"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">destroy</span><span class="params">()</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>因为用的springboot，所以就不写 web.xml 了，写个配置类</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">FilterConfiguration</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> FilterRegistrationBean <span class="title">filterDemo4Registration</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        FilterRegistrationBean registration = <span class="keyword">new</span> FilterRegistrationBean();</span><br><span class="line">        <span class="comment">//注入过滤器</span></span><br><span class="line">        registration.setFilter(<span class="keyword">new</span> DemoFilter());</span><br><span class="line">        <span class="comment">//拦截规则</span></span><br><span class="line">        registration.addUrlPatterns(<span class="string">"/*"</span>);</span><br><span class="line">        <span class="comment">//过滤器名称</span></span><br><span class="line">        registration.setName(<span class="string">"DemoFilter"</span>);</span><br><span class="line">        <span class="comment">//是否自动注册 false 取消Filter的自动注册</span></span><br><span class="line">        registration.setEnabled(<span class="keyword">true</span>);</span><br><span class="line">        <span class="comment">//过滤器顺序</span></span><br><span class="line">        registration.setOrder(<span class="number">1</span>);</span><br><span class="line">        <span class="keyword">return</span> registration;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>然后再来个 interceptor 和 aop,以及一个简单的请求处理</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DemoInterceptor</span> <span class="keyword">extends</span> <span class="title">HandlerInterceptorAdapter</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">preHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"preHandle test"</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">postHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"postHandle test"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="meta">@Aspect</span></span><br><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DemoAspect</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Pointcut</span>(<span class="string">"execution( public * com.nicksxs.springbootdemo.demo.DemoController.*())"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">point</span><span class="params">()</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Before</span>(<span class="string">"point()"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doBefore</span><span class="params">()</span></span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"==doBefore=="</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@After</span>(<span class="string">"point()"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doAfter</span><span class="params">()</span></span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"==doAfter=="</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="meta">@RestController</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DemoController</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@RequestMapping</span>(<span class="string">"/hello"</span>)</span><br><span class="line">    <span class="meta">@ResponseBody</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">hello</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">"hello world"</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+<p>好了，请求一下，看看 stdout，<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/pT4oXL.png" alt=""><br>搞定完事儿~</p>
 
       
     </div>
@@ -828,7 +842,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -903,7 +917,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
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diff --git a/page/5/index.html b/page/5/index.html
index 335be6090e..80e2386fa2 100644
--- a/page/5/index.html
+++ b/page/5/index.html
@@ -203,6 +203,109 @@
       
   
   
+  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/08/16/%E5%91%A8%E6%9C%AB%E6%88%91%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/">
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+      <meta itemprop="image" content="/uploads/avatar.jpg">
+      <meta itemprop="name" content="Nicksxs">
+      <meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森">
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+    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
+      <meta itemprop="name" content="Nicksxs's Blog">
+    </span>
+      <header class="post-header">
+        <h2 class="post-title" itemprop="name headline">
+          
+            <a href="/2020/08/16/%E5%91%A8%E6%9C%AB%E6%88%91%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/" class="post-title-link" itemprop="url">周末我在老丈人家打了天小工</a>
+        </h2>
+
+        <div class="post-meta">
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
+                <i class="far fa-calendar"></i>
+              </span>
+              <span class="post-meta-item-text">Posted on</span>
+              
+
+              <time title="Created: 2020-08-16 23:01:09 / Modified: 23:48:08" itemprop="dateCreated datePublished" datetime="2020-08-16T23:01:09+08:00">2020-08-16</time>
+            </span>
+            <span class="post-meta-item">
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+                <i class="far fa-folder"></i>
+              </span>
+              <span class="post-meta-item-text">In</span>
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/" itemprop="url" rel="index"><span itemprop="name">运动</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/" itemprop="url" rel="index"><span itemprop="name">跑步</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E8%BF%90%E5%8A%A8/%E8%B7%91%E6%AD%A5/%E5%B9%B2%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">干活</span></a>
+                </span>
+            </span>
+
+          
+            <span id="/2020/08/16/%E5%91%A8%E6%9C%AB%E6%88%91%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/" class="post-meta-item leancloud_visitors" data-flag-title="周末我在老丈人家打了天小工" title="Views">
+              <span class="post-meta-item-icon">
+                <i class="fa fa-eye"></i>
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+              <span class="post-meta-item-text">Views: </span>
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+    <a title="disqus" href="/2020/08/16/%E5%91%A8%E6%9C%AB%E6%88%91%E5%9C%A8%E8%80%81%E4%B8%88%E4%BA%BA%E5%AE%B6%E6%89%93%E4%BA%86%E5%A4%A9%E5%B0%8F%E5%B7%A5/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/08/16/周末我在老丈人家打了天小工/" itemprop="commentCount"></span>
+    </a>
+  </span>
+  
+  
+
+        </div>
+      </header>
+
+    
+    
+    
+    <div class="post-body" itemprop="articleBody">
+
+      
+          <p>这周回家提前约好了要去老丈人家帮下忙，因为在翻修下老房子，活不是特别整的那种，所以大部分都是自己干，或者找个大工临时干几天（我们这那种比较专业的泥工匠叫做大工），像我这样去帮忙的，就是干点小工（把给大工帮忙的，干些偏体力活的叫做小工）的活。从大学毕业以后真的蛮少帮家里干活了，以前上学的时候放假还是帮家里淘个米，简单的扫地拖地啥的，当然刚高考完的时候，还去我爸厂里帮忙干了几天的活，实在是比较累，不过现在想着是觉得自己那时候比较牛，而不是特别排斥这个活，相对于现在的工作来说，导致了一系列的职业病，颈椎腰背都很僵硬，眼镜也不好，还有反流，像我爸那种活反而是脑力加体力的比较好的结合。<br>这一天的活前半部分主要是在清理厨房，瓷砖上的油污和墙上天花板上即将脱落的石灰或者白色涂料层，这种活特别是瓷砖上的油污，之前在自己家里也干活，还是比较熟悉的，不过前面主要是LD 在干，我主要是先搞墙上和天花板上的，干活还是很需要技巧的，如果直接去铲，那基本我会变成一个灰人，而且吸一鼻子灰，老丈人比较专业，先接上软管用水冲，一冲效果特别好，有些石灰涂料层直接就冲掉了，冲完之后先用带加长杆的刀片铲铲了一圈墙面，说实话因为老房子之前租出去了，所以墙面什么的被糟蹋的比较难看，一层一层的，不过这还算还好，后面主要是天花板上的，这可难倒我了，从小我爸妈是比较把我当小孩管着，爬上爬下的基本都是我爸搞定，但是到了老丈人家也只得硬着头皮上了，爬到跳（一种建筑工地用的架子）上，还有点晃，小心脏扑通扑通跳，而且带加长杆的铲子还是比较重的，铲一会手也有点累，不过坚持着铲完了，上面还是比较平整的，不过下来的时候又把我难住了🤦‍♂️，往下爬的时候有根杆子要跨过去，由于裤子比较紧，强行一把跨过去怕抽筋，所以以一个非常尴尬的姿势停留休息了一会，再跨了过去，幸好事后问 LD，他们都没看到，哈哈哈，然后就是帮忙一起搞瓷砖上的油污，这个太有经验了，不过老丈人更有意思，一会试试啤酒，一会用用沙子，后面在午饭前基本就弄的比较干净了，就坐着等吃饭了，下午午休了会，就继续干活了。<br>下午是我这次体验的重点了，因为要清理以前贴的墙纸，真的是个很麻烦的活，只能说贴墙纸的师傅活干得太好了，基本不可能整个撕下来，想用铲子一点点铲下来也不行，太轻了就只铲掉表面一层，太重了就把墙纸跟墙面的石灰啥的整个铲下来了，而且手又累又酸，后来想着是不是继续用水冲一下，对着一小面墙试验了下，效果还不错，但是又发现了个问题，那一面墙又有一块是后面糊上去的，铲掉外层的石灰后不平，然后就是最最重头的，也是让我后遗症持续到第二天的，要把那一块糊上去的水泥敲下来，毛估下大概是敲了80%左右，剩下的我的手已经不会用力了，因为那一块应该是要糊上去的始作俑者，就一块里面凹进去的，我拿着榔头敲到我手已经没法使劲了，而且大下午，感觉没五分钟，我的汗已经糊满脸，眼睛也睁不开，不然就流到眼睛里了，此处获得成就一：用榔头敲墙壁，也是个技术加体力的活，而且需要非常好的技巧，否则手马上就废了，敲下去的反作用力，没一会就不行了，然后是看着老丈人兄弟帮忙拆一个柜子，在我看来是个几天都搞不定的活，他轻轻松松在我敲墙的那会就搞定了，以前总觉得我干的活非常有技术含量，可是这个事情真的也是很有技巧啊，它是个把一间房间分隔开的柜子，从底到顶上，还带着门，我还在旁边帮忙撬一下脚踢，一根木条撬半天，唉，成就二：专业的人就是不一样。<br>最后就是成就三了：我之前沾沾自喜的跑了多少步，做了什么锻炼，其实都是渣渣，像这样干一天活，没经历过的，基本大半天就废了，反过来说，如果能经常去这么干一天活，跑步啥的都是渣渣，消耗的能量远远超过跑个十公里啥的。</p>
+
+      
+    </div>
+
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+      
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+      <footer class="post-footer">
+        <div class="post-eof"></div>
+      </footer>
+  </article>
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-  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/07/11/2020%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/">
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-      <meta itemprop="name" content="Nicksxs's Blog">
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-      <header class="post-header">
-        <h2 class="post-title" itemprop="name headline">
-          
-            <a href="/2020/07/11/2020%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" class="post-title-link" itemprop="url">2020年中总结</a>
-        </h2>
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-              
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-              <time title="Created: 2020-07-11 23:20:38 / Modified: 23:21:22" itemprop="dateCreated datePublished" datetime="2020-07-11T23:20:38+08:00">2020-07-11</time>
-            </span>
-            <span class="post-meta-item">
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-              <span class="post-meta-item-text">In</span>
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" itemprop="url" rel="index"><span itemprop="name">年中总结</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/2020/" itemprop="url" rel="index"><span itemprop="name">2020</span></a>
-                </span>
-            </span>
-
-          
-            <span id="/2020/07/11/2020%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" class="post-meta-item leancloud_visitors" data-flag-title="2020年中总结" title="Views">
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-    
-    <a title="disqus" href="/2020/07/11/2020%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/07/11/2020年中总结/" itemprop="commentCount"></span>
-    </a>
-  </span>
-  
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-          <p>很快2020 年就过了一半了，而且是今年这么特殊的一年，很多事情都发生的出乎意料，疫情这个绕不过去的话题，之前写了点比较愤青的文字，感觉不太适合发出来就烂在草稿箱里吧，这个目前一大影响估计是今年都没办法完全摘下口罩了，前面几个月来回杭州都开车，因为彭埠大桥不通行了，实在是非常不方便，每条路都灰常堵，心累，吐槽下杭州的交通规划和交警同志，工作实在做的不咋地。</p>
-<p>另外一件是就是蜗壳，从前不知道黝黑蜗壳是啥意思，只是经常会在他的视频里看到，大学的时候在缘网下了一个集锦，炒鸡帅气，各种空接扣篮，越来越能明白那句“你永远不知道意外和明天不知道哪个会先来,且行且珍惜”的含义，只是听了很多道理，依然活不好这一生，知易行难，王阳明真的是这方面的大师，有空可以看看这方面的书，一直想写写我跟篮球跟蜗壳的这十几年，争取能早日写好吧，不过得找个静得下来的时候写。</p>
-<p>正事方面上半年还是挺让人失望的，没有达成一些目标，应该还是能力不足吧，技术方面分析一下还是停留在看的表面层，有些实操的，或者结合业务场景的能力不太行，算是在坚持写写 blog，主要是被这个每周一篇的目标推着走，有时会比较焦虑，内容产出也还比较差，希望能在后面有些改善，可能会降低频率，只是觉得降低了也不一定能有比较好的提升，无法战胜自己的惰性，所以暂时还是坚持下这个目标吧，还有就是 coding 能力，有时候也应该刷刷题，提升思维敏捷度，大脑用太少可能生锈了，况且本来就不是很有优势，虽然失望也只能继续努力吧，日拱一卒，来日方长，加油吧~😔</p>
-<p>还有就是跑步减肥了，截止今天，上半年跑了 136 公里了，因为疫情影响，农历年后是从 4 月 17 号开始跑的，去年跑到了 300 公里，奖励自己了一个手表（真的挺后悔的，还不如 200 块买个手表），今年希望可以能在这个基础上再进一步，一直跟领导说，跑步算是我坚持下来的唯一一个好习惯了，618 买了个跑步机，周末回家了可以不受天气影响的多跑跑，不过如果天气好可能还是会出去跑跑，跑步机跑道多少还是有点拘束，只是感觉可能是我还是吃得太多了🤦‍♂️，效果不是很明显，还在 80 这个坎徘徊，等于浪费了大半年，可能是年初的项目太费心力，压力比较大，吃得更多，是不是可以算工伤😄，这方面也需要好好调整，可以放得开一点，虽然不太可能一下子到位，但是总要去努力下，随着年龄成长总要承担更多，也要看得开一点，没法事事如愿，尽力就好了，减肥这个事情还在结合一些俯卧撑啥的，希望也能坚持下去，加油吧，不知道原话怎么说的，意思是人类最大的勇敢就是看透了人世间的苦难，仍然热爱生活。我当然没可能让内心变得这么强大，试着去努力吧，奥力给！</p>
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-  </article>
-  
-  
-  
-
 
   
   <nav class="pagination">
@@ -884,7 +885,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -959,7 +960,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
   </span>
diff --git a/page/6/index.html b/page/6/index.html
index 008eaf8927..faeacb216f 100644
--- a/page/6/index.html
+++ b/page/6/index.html
@@ -203,6 +203,108 @@
       
   
   
+  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/07/11/2020%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/">
+
+    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
+      <meta itemprop="image" content="/uploads/avatar.jpg">
+      <meta itemprop="name" content="Nicksxs">
+      <meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森">
+    </span>
+
+    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
+      <meta itemprop="name" content="Nicksxs's Blog">
+    </span>
+      <header class="post-header">
+        <h2 class="post-title" itemprop="name headline">
+          
+            <a href="/2020/07/11/2020%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" class="post-title-link" itemprop="url">2020年中总结</a>
+        </h2>
+
+        <div class="post-meta">
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
+                <i class="far fa-calendar"></i>
+              </span>
+              <span class="post-meta-item-text">Posted on</span>
+              
+
+              <time title="Created: 2020-07-11 23:20:38 / Modified: 23:21:22" itemprop="dateCreated datePublished" datetime="2020-07-11T23:20:38+08:00">2020-07-11</time>
+            </span>
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
+                <i class="far fa-folder"></i>
+              </span>
+              <span class="post-meta-item-text">In</span>
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" itemprop="url" rel="index"><span itemprop="name">年中总结</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/%E7%94%9F%E6%B4%BB/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/2020/" itemprop="url" rel="index"><span itemprop="name">2020</span></a>
+                </span>
+            </span>
+
+          
+            <span id="/2020/07/11/2020%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" class="post-meta-item leancloud_visitors" data-flag-title="2020年中总结" title="Views">
+              <span class="post-meta-item-icon">
+                <i class="fa fa-eye"></i>
+              </span>
+              <span class="post-meta-item-text">Views: </span>
+              <span class="leancloud-visitors-count"></span>
+            </span>
+  
+  <span class="post-meta-item">
+    
+      <span class="post-meta-item-icon">
+        <i class="far fa-comment"></i>
+      </span>
+      <span class="post-meta-item-text">Disqus: </span>
+    
+    <a title="disqus" href="/2020/07/11/2020%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/07/11/2020年中总结/" itemprop="commentCount"></span>
+    </a>
+  </span>
+  
+  
+
+        </div>
+      </header>
+
+    
+    
+    
+    <div class="post-body" itemprop="articleBody">
+
+      
+          <p>很快2020 年就过了一半了，而且是今年这么特殊的一年，很多事情都发生的出乎意料，疫情这个绕不过去的话题，之前写了点比较愤青的文字，感觉不太适合发出来就烂在草稿箱里吧，这个目前一大影响估计是今年都没办法完全摘下口罩了，前面几个月来回杭州都开车，因为彭埠大桥不通行了，实在是非常不方便，每条路都灰常堵，心累，吐槽下杭州的交通规划和交警同志，工作实在做的不咋地。</p>
+<p>另外一件是就是蜗壳，从前不知道黝黑蜗壳是啥意思，只是经常会在他的视频里看到，大学的时候在缘网下了一个集锦，炒鸡帅气，各种空接扣篮，越来越能明白那句“你永远不知道意外和明天不知道哪个会先来,且行且珍惜”的含义，只是听了很多道理，依然活不好这一生，知易行难，王阳明真的是这方面的大师，有空可以看看这方面的书，一直想写写我跟篮球跟蜗壳的这十几年，争取能早日写好吧，不过得找个静得下来的时候写。</p>
+<p>正事方面上半年还是挺让人失望的，没有达成一些目标，应该还是能力不足吧，技术方面分析一下还是停留在看的表面层，有些实操的，或者结合业务场景的能力不太行，算是在坚持写写 blog，主要是被这个每周一篇的目标推着走，有时会比较焦虑，内容产出也还比较差，希望能在后面有些改善，可能会降低频率，只是觉得降低了也不一定能有比较好的提升，无法战胜自己的惰性，所以暂时还是坚持下这个目标吧，还有就是 coding 能力，有时候也应该刷刷题，提升思维敏捷度，大脑用太少可能生锈了，况且本来就不是很有优势，虽然失望也只能继续努力吧，日拱一卒，来日方长，加油吧~😔</p>
+<p>还有就是跑步减肥了，截止今天，上半年跑了 136 公里了，因为疫情影响，农历年后是从 4 月 17 号开始跑的，去年跑到了 300 公里，奖励自己了一个手表（真的挺后悔的，还不如 200 块买个手表），今年希望可以能在这个基础上再进一步，一直跟领导说，跑步算是我坚持下来的唯一一个好习惯了，618 买了个跑步机，周末回家了可以不受天气影响的多跑跑，不过如果天气好可能还是会出去跑跑，跑步机跑道多少还是有点拘束，只是感觉可能是我还是吃得太多了🤦‍♂️，效果不是很明显，还在 80 这个坎徘徊，等于浪费了大半年，可能是年初的项目太费心力，压力比较大，吃得更多，是不是可以算工伤😄，这方面也需要好好调整，可以放得开一点，虽然不太可能一下子到位，但是总要去努力下，随着年龄成长总要承担更多，也要看得开一点，没法事事如愿，尽力就好了，减肥这个事情还在结合一些俯卧撑啥的，希望也能坚持下去，加油吧，不知道原话怎么说的，意思是人类最大的勇敢就是看透了人世间的苦难，仍然热爱生活。我当然没可能让内心变得这么强大，试着去努力吧，奥力给！</p>
+
+      
+    </div>
+
+    
+    
+    
+      
+
+      <footer class="post-footer">
+        <div class="post-eof"></div>
+      </footer>
+  </article>
+  
+  
+  
+
+      
+  
+  
   <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
     <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/07/05/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84-NameServer-%E6%BA%90%E7%A0%81/">
 
@@ -782,124 +884,6 @@
   
   
 
-      
-  
-  
-  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
-    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/06/06/%E8%81%8A%E8%81%8A-Dubbo-%E7%9A%84-SPI-%E7%BB%AD%E4%B9%8B%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/">
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-      <meta itemprop="image" content="/uploads/avatar.jpg">
-      <meta itemprop="name" content="Nicksxs">
-      <meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森">
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-    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
-      <meta itemprop="name" content="Nicksxs's Blog">
-    </span>
-      <header class="post-header">
-        <h2 class="post-title" itemprop="name headline">
-          
-            <a href="/2020/06/06/%E8%81%8A%E8%81%8A-Dubbo-%E7%9A%84-SPI-%E7%BB%AD%E4%B9%8B%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/" class="post-title-link" itemprop="url">聊聊 Dubbo 的 SPI 续之自适应拓展</a>
-        </h2>
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-              <span class="post-meta-item-icon">
-                <i class="far fa-calendar"></i>
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-              <span class="post-meta-item-text">Posted on</span>
-              
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-              <time title="Created: 2020-06-06 22:39:38 / Modified: 22:48:09" itemprop="dateCreated datePublished" datetime="2020-06-06T22:39:38+08:00">2020-06-06</time>
-            </span>
-            <span class="post-meta-item">
-              <span class="post-meta-item-icon">
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-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Dubbo-RPC-SPI/" itemprop="url" rel="index"><span itemprop="name">Dubbo - RPC - SPI</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Dubbo/" itemprop="url" rel="index"><span itemprop="name">Dubbo</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Dubbo/SPI/" itemprop="url" rel="index"><span itemprop="name">SPI</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Dubbo/SPI/Adaptive/" itemprop="url" rel="index"><span itemprop="name">Adaptive</span></a>
-                </span>
-            </span>
-
-          
-            <span id="/2020/06/06/%E8%81%8A%E8%81%8A-Dubbo-%E7%9A%84-SPI-%E7%BB%AD%E4%B9%8B%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/" class="post-meta-item leancloud_visitors" data-flag-title="聊聊 Dubbo 的 SPI 续之自适应拓展" title="Views">
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-              <span class="leancloud-visitors-count"></span>
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-      <span class="post-meta-item-text">Disqus: </span>
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-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/06/06/聊聊-Dubbo-的-SPI-续之自适应拓展/" itemprop="commentCount"></span>
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-      </header>
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-    
-    <div class="post-body" itemprop="articleBody">
-
-      
-          <h2 id="Adaptive"><a href="#Adaptive" class="headerlink" title="Adaptive"></a>Adaptive</h2><p>这个应该是 Dubbo SPI 里最玄妙的东西了，一开始没懂，自适应扩展点加载，<br><code>dubbo://123.123.123.123:1234/com.nicksxs.demo.service.HelloWorldService?anyhost=true&amp;application=demo&amp;default.loadbalance=random&amp;default.service.filter=LoggerFilter&amp;dubbo=2.5.3&amp;interface=com.nicksxs.demo.service.HelloWorldService&amp;logger=slf4j&amp;methods=method1,method2,method3,method4&amp;pid=4292&amp;retries=0&amp;side=provider&amp;threadpool=fixed&amp;threads=200&amp;timeout=2000&amp;timestamp=1590647155886</code><br>那我从比较能理解的角度或者说思路去讲讲我的理解，因为直接将原理如果脱离了使用，对于我这样的理解能力比较差的可能会比较吃力，从使用场景开始讲可能会比较舒服了，这里可以看到参数里有蛮多的，举个例子，比如这个 <code>threadpool = fixed</code>，说明线程池使用的是 fixed 对应的实现，也就是下图的这个<br><img data-src="https://mystore-1255223546.cos.ap-chengdu.myqcloud.com/uPic/4AAOaW.png" alt=""><br>这样子似乎没啥问题了，反正就是用dubbo 的 spi 加载嘛，好像没啥问题，其实问题还是存在的，或者说不太优雅，比如要先判断我这个 fixed 对应的实现类是哪个，这里可能就有个 if-else 判断了，但是 dubbo 的开发人员似乎不太想这么做这个事情，</p>
-<p>譬如我们在引用一个服务时，在ReferenceConfig 中的</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> Protocol refprotocol = ExtensionLoader.getExtensionLoader(Protocol<span class="class">.<span class="keyword">class</span>).<span class="title">getAdaptiveExtension</span>()</span>;</span><br></pre></td></tr></table></figure>
-
-<p>就获取了自适应拓展，</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> T <span class="title">getAdaptiveExtension</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        Object instance = cachedAdaptiveInstance.get();</span><br><span class="line">        <span class="keyword">if</span> (instance == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">if</span> (createAdaptiveInstanceError == <span class="keyword">null</span>) &#123;</span><br><span class="line">                <span class="keyword">synchronized</span> (cachedAdaptiveInstance) &#123;</span><br><span class="line">                    instance = cachedAdaptiveInstance.get();</span><br><span class="line">                    <span class="keyword">if</span> (instance == <span class="keyword">null</span>) &#123;</span><br><span class="line">                        <span class="keyword">try</span> &#123;</span><br><span class="line">                            instance = createAdaptiveExtension();</span><br><span class="line">                            cachedAdaptiveInstance.set(instance);</span><br><span class="line">                        &#125; <span class="keyword">catch</span> (Throwable t) &#123;</span><br><span class="line">                            createAdaptiveInstanceError = t;</span><br><span class="line">                            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(<span class="string">"fail to create adaptive instance: "</span> + t.toString(), t);</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(<span class="string">"fail to create adaptive instance: "</span> + createAdaptiveInstanceError.toString(), createAdaptiveInstanceError);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">return</span> (T) instance;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
-
-<p>这里也使用了 DCL，来锁cachedAdaptiveInstance，当缓存中没有时就去创建自适应拓展</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> T <span class="title">createAdaptiveExtension</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">          <span class="comment">// 获取自适应拓展类然后实例化</span></span><br><span class="line">            <span class="keyword">return</span> injectExtension((T) getAdaptiveExtensionClass().newInstance());</span><br><span class="line">        &#125; <span class="keyword">catch</span> (Exception e) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(<span class="string">"Can not create adaptive extension "</span> + type + <span class="string">", cause: "</span> + e.getMessage(), e);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">private</span> Class&lt;?&gt; getAdaptiveExtensionClass() &#123;</span><br><span class="line">  			<span class="comment">// 这里会获取拓展类，如果没有自适应的拓展类，那么就需要调用createAdaptiveExtensionClass</span></span><br><span class="line">        getExtensionClasses();</span><br><span class="line">        <span class="keyword">if</span> (cachedAdaptiveClass != <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">return</span> cachedAdaptiveClass;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> cachedAdaptiveClass = createAdaptiveExtensionClass();</span><br><span class="line">    &#125;</span><br><span class="line"><span class="keyword">private</span> Class&lt;?&gt; createAdaptiveExtensionClass() &#123;</span><br><span class="line">  			<span class="comment">// 这里去生成了自适应拓展的代码，具体生成逻辑比较复杂先不展开讲</span></span><br><span class="line">        String code = createAdaptiveExtensionClassCode();</span><br><span class="line">        ClassLoader classLoader = findClassLoader();</span><br><span class="line">        com.alibaba.dubbo.common.compiler.Compiler compiler = ExtensionLoader.getExtensionLoader(com.alibaba.dubbo.common.compiler.Compiler<span class="class">.<span class="keyword">class</span>).<span class="title">getAdaptiveExtension</span>()</span>;</span><br><span class="line">        <span class="keyword">return</span> compiler.compile(code, classLoader);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
-
-<p>生成的代码像这样</p>
-<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.alibaba.dubbo.rpc;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.alibaba.dubbo.common.extension.ExtensionLoader;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Protocol</span>$<span class="title">Adaptive</span> <span class="keyword">implements</span> <span class="title">com</span>.<span class="title">alibaba</span>.<span class="title">dubbo</span>.<span class="title">rpc</span>.<span class="title">Protocol</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">destroy</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> UnsupportedOperationException(</span><br><span class="line">            <span class="string">"method public abstract void com.alibaba.dubbo.rpc.Protocol.destroy() of interface com.alibaba.dubbo.rpc.Protocol is not adaptive method!"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getDefaultPort</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> UnsupportedOperationException(</span><br><span class="line">            <span class="string">"method public abstract int com.alibaba.dubbo.rpc.Protocol.getDefaultPort() of interface com.alibaba.dubbo.rpc.Protocol is not adaptive method!"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> com.alibaba.dubbo.rpc.<span class="function">Exporter <span class="title">export</span><span class="params">(</span></span></span><br><span class="line"><span class="function"><span class="params">        com.alibaba.dubbo.rpc.Invoker arg0)</span></span></span><br><span class="line"><span class="function">        <span class="keyword">throws</span> com.alibaba.dubbo.rpc.RpcException </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (arg0 == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(</span><br><span class="line">                <span class="string">"com.alibaba.dubbo.rpc.Invoker argument == null"</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (arg0.getUrl() == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(</span><br><span class="line">                <span class="string">"com.alibaba.dubbo.rpc.Invoker argument getUrl() == null"</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        com.alibaba.dubbo.common.URL url = arg0.getUrl();</span><br><span class="line">        String extName = ((url.getProtocol() == <span class="keyword">null</span>) ? <span class="string">"dubbo"</span></span><br><span class="line">                                                      : url.getProtocol());</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (extName == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(</span><br><span class="line">                <span class="string">"Fail to get extension(com.alibaba.dubbo.rpc.Protocol) name from url("</span> +</span><br><span class="line">                url.toString() + <span class="string">") use keys([protocol])"</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        com.alibaba.dubbo.rpc.Protocol extension = (com.alibaba.dubbo.rpc.Protocol) ExtensionLoader.getExtensionLoader(com.alibaba.dubbo.rpc.Protocol<span class="class">.<span class="keyword">class</span>)</span></span><br><span class="line"><span class="class">                                                                                                   .<span class="title">getExtension</span>(<span class="title">extName</span>)</span>;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">return</span> extension.export(arg0);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> com.alibaba.dubbo.rpc.<span class="function">Invoker <span class="title">refer</span><span class="params">(java.lang.Class arg0,</span></span></span><br><span class="line"><span class="function"><span class="params">        com.alibaba.dubbo.common.URL arg1)</span></span></span><br><span class="line"><span class="function">        <span class="keyword">throws</span> com.alibaba.dubbo.rpc.RpcException </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (arg1 == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(<span class="string">"url == null"</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        com.alibaba.dubbo.common.URL url = arg1;</span><br><span class="line">      <span class="comment">// 其实前面所说的逻辑就在这里呈现了</span></span><br><span class="line">        String extName = ((url.getProtocol() == <span class="keyword">null</span>) ? <span class="string">"dubbo"</span></span><br><span class="line">                                                      : url.getProtocol());</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (extName == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(</span><br><span class="line">                <span class="string">"Fail to get extension(com.alibaba.dubbo.rpc.Protocol) name from url("</span> +</span><br><span class="line">                url.toString() + <span class="string">") use keys([protocol])"</span>);</span><br><span class="line">        &#125;</span><br><span class="line">				<span class="comment">// 在这就是实际的通过dubbo 的 spi 去加载实际对应的扩展</span></span><br><span class="line">        com.alibaba.dubbo.rpc.Protocol extension = (com.alibaba.dubbo.rpc.Protocol) ExtensionLoader.getExtensionLoader(com.alibaba.dubbo.rpc.Protocol<span class="class">.<span class="keyword">class</span>)</span></span><br><span class="line"><span class="class">                                                                                                   .<span class="title">getExtension</span>(<span class="title">extName</span>)</span>;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">return</span> extension.refer(arg0, arg1);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
-
-      
-    </div>
-
-    
-    
-    
-      
-
-      <footer class="post-footer">
-        <div class="post-eof"></div>
-      </footer>
-  </article>
-  
-  
-  
-
 
   
   <nav class="pagination">
@@ -971,7 +955,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -1046,7 +1030,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
   <span class="with-love">
     <i class="fa fa-heart"></i>
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diff --git a/page/7/index.html b/page/7/index.html
index 0106ed2594..26b3a2e964 100644
--- a/page/7/index.html
+++ b/page/7/index.html
@@ -203,6 +203,124 @@
       
   
   
+  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/06/06/%E8%81%8A%E8%81%8A-Dubbo-%E7%9A%84-SPI-%E7%BB%AD%E4%B9%8B%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/">
+
+    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
+      <meta itemprop="image" content="/uploads/avatar.jpg">
+      <meta itemprop="name" content="Nicksxs">
+      <meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森">
+    </span>
+
+    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
+      <meta itemprop="name" content="Nicksxs's Blog">
+    </span>
+      <header class="post-header">
+        <h2 class="post-title" itemprop="name headline">
+          
+            <a href="/2020/06/06/%E8%81%8A%E8%81%8A-Dubbo-%E7%9A%84-SPI-%E7%BB%AD%E4%B9%8B%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/" class="post-title-link" itemprop="url">聊聊 Dubbo 的 SPI 续之自适应拓展</a>
+        </h2>
+
+        <div class="post-meta">
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
+                <i class="far fa-calendar"></i>
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+              <span class="post-meta-item-text">Posted on</span>
+              
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+              <time title="Created: 2020-06-06 22:39:38 / Modified: 22:48:09" itemprop="dateCreated datePublished" datetime="2020-06-06T22:39:38+08:00">2020-06-06</time>
+            </span>
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
+                <i class="far fa-folder"></i>
+              </span>
+              <span class="post-meta-item-text">In</span>
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Dubbo-RPC-SPI/" itemprop="url" rel="index"><span itemprop="name">Dubbo - RPC - SPI</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Dubbo/" itemprop="url" rel="index"><span itemprop="name">Dubbo</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Dubbo/SPI/" itemprop="url" rel="index"><span itemprop="name">SPI</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Dubbo/SPI/Adaptive/" itemprop="url" rel="index"><span itemprop="name">Adaptive</span></a>
+                </span>
+            </span>
+
+          
+            <span id="/2020/06/06/%E8%81%8A%E8%81%8A-Dubbo-%E7%9A%84-SPI-%E7%BB%AD%E4%B9%8B%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/" class="post-meta-item leancloud_visitors" data-flag-title="聊聊 Dubbo 的 SPI 续之自适应拓展" title="Views">
+              <span class="post-meta-item-icon">
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+  
+  <span class="post-meta-item">
+    
+      <span class="post-meta-item-icon">
+        <i class="far fa-comment"></i>
+      </span>
+      <span class="post-meta-item-text">Disqus: </span>
+    
+    <a title="disqus" href="/2020/06/06/%E8%81%8A%E8%81%8A-Dubbo-%E7%9A%84-SPI-%E7%BB%AD%E4%B9%8B%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/#disqus_thread" itemprop="discussionUrl">
+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/06/06/聊聊-Dubbo-的-SPI-续之自适应拓展/" itemprop="commentCount"></span>
+    </a>
+  </span>
+  
+  
+
+        </div>
+      </header>
+
+    
+    
+    
+    <div class="post-body" itemprop="articleBody">
+
+      
+          <h2 id="Adaptive"><a href="#Adaptive" class="headerlink" title="Adaptive"></a>Adaptive</h2><p>这个应该是 Dubbo SPI 里最玄妙的东西了，一开始没懂，自适应扩展点加载，<br><code>dubbo://123.123.123.123:1234/com.nicksxs.demo.service.HelloWorldService?anyhost=true&amp;application=demo&amp;default.loadbalance=random&amp;default.service.filter=LoggerFilter&amp;dubbo=2.5.3&amp;interface=com.nicksxs.demo.service.HelloWorldService&amp;logger=slf4j&amp;methods=method1,method2,method3,method4&amp;pid=4292&amp;retries=0&amp;side=provider&amp;threadpool=fixed&amp;threads=200&amp;timeout=2000&amp;timestamp=1590647155886</code><br>那我从比较能理解的角度或者说思路去讲讲我的理解，因为直接将原理如果脱离了使用，对于我这样的理解能力比较差的可能会比较吃力，从使用场景开始讲可能会比较舒服了，这里可以看到参数里有蛮多的，举个例子，比如这个 <code>threadpool = fixed</code>，说明线程池使用的是 fixed 对应的实现，也就是下图的这个<br><img data-src="https://mystore-1255223546.cos.ap-chengdu.myqcloud.com/uPic/4AAOaW.png" alt=""><br>这样子似乎没啥问题了，反正就是用dubbo 的 spi 加载嘛，好像没啥问题，其实问题还是存在的，或者说不太优雅，比如要先判断我这个 fixed 对应的实现类是哪个，这里可能就有个 if-else 判断了，但是 dubbo 的开发人员似乎不太想这么做这个事情，</p>
+<p>譬如我们在引用一个服务时，在ReferenceConfig 中的</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> Protocol refprotocol = ExtensionLoader.getExtensionLoader(Protocol<span class="class">.<span class="keyword">class</span>).<span class="title">getAdaptiveExtension</span>()</span>;</span><br></pre></td></tr></table></figure>
+
+<p>就获取了自适应拓展，</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> T <span class="title">getAdaptiveExtension</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        Object instance = cachedAdaptiveInstance.get();</span><br><span class="line">        <span class="keyword">if</span> (instance == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">if</span> (createAdaptiveInstanceError == <span class="keyword">null</span>) &#123;</span><br><span class="line">                <span class="keyword">synchronized</span> (cachedAdaptiveInstance) &#123;</span><br><span class="line">                    instance = cachedAdaptiveInstance.get();</span><br><span class="line">                    <span class="keyword">if</span> (instance == <span class="keyword">null</span>) &#123;</span><br><span class="line">                        <span class="keyword">try</span> &#123;</span><br><span class="line">                            instance = createAdaptiveExtension();</span><br><span class="line">                            cachedAdaptiveInstance.set(instance);</span><br><span class="line">                        &#125; <span class="keyword">catch</span> (Throwable t) &#123;</span><br><span class="line">                            createAdaptiveInstanceError = t;</span><br><span class="line">                            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(<span class="string">"fail to create adaptive instance: "</span> + t.toString(), t);</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(<span class="string">"fail to create adaptive instance: "</span> + createAdaptiveInstanceError.toString(), createAdaptiveInstanceError);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">return</span> (T) instance;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
+
+<p>这里也使用了 DCL，来锁cachedAdaptiveInstance，当缓存中没有时就去创建自适应拓展</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> T <span class="title">createAdaptiveExtension</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">          <span class="comment">// 获取自适应拓展类然后实例化</span></span><br><span class="line">            <span class="keyword">return</span> injectExtension((T) getAdaptiveExtensionClass().newInstance());</span><br><span class="line">        &#125; <span class="keyword">catch</span> (Exception e) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(<span class="string">"Can not create adaptive extension "</span> + type + <span class="string">", cause: "</span> + e.getMessage(), e);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">private</span> Class&lt;?&gt; getAdaptiveExtensionClass() &#123;</span><br><span class="line">  			<span class="comment">// 这里会获取拓展类，如果没有自适应的拓展类，那么就需要调用createAdaptiveExtensionClass</span></span><br><span class="line">        getExtensionClasses();</span><br><span class="line">        <span class="keyword">if</span> (cachedAdaptiveClass != <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">return</span> cachedAdaptiveClass;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> cachedAdaptiveClass = createAdaptiveExtensionClass();</span><br><span class="line">    &#125;</span><br><span class="line"><span class="keyword">private</span> Class&lt;?&gt; createAdaptiveExtensionClass() &#123;</span><br><span class="line">  			<span class="comment">// 这里去生成了自适应拓展的代码，具体生成逻辑比较复杂先不展开讲</span></span><br><span class="line">        String code = createAdaptiveExtensionClassCode();</span><br><span class="line">        ClassLoader classLoader = findClassLoader();</span><br><span class="line">        com.alibaba.dubbo.common.compiler.Compiler compiler = ExtensionLoader.getExtensionLoader(com.alibaba.dubbo.common.compiler.Compiler<span class="class">.<span class="keyword">class</span>).<span class="title">getAdaptiveExtension</span>()</span>;</span><br><span class="line">        <span class="keyword">return</span> compiler.compile(code, classLoader);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
+
+<p>生成的代码像这样</p>
+<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.alibaba.dubbo.rpc;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.alibaba.dubbo.common.extension.ExtensionLoader;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Protocol</span>$<span class="title">Adaptive</span> <span class="keyword">implements</span> <span class="title">com</span>.<span class="title">alibaba</span>.<span class="title">dubbo</span>.<span class="title">rpc</span>.<span class="title">Protocol</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">destroy</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> UnsupportedOperationException(</span><br><span class="line">            <span class="string">"method public abstract void com.alibaba.dubbo.rpc.Protocol.destroy() of interface com.alibaba.dubbo.rpc.Protocol is not adaptive method!"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getDefaultPort</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> UnsupportedOperationException(</span><br><span class="line">            <span class="string">"method public abstract int com.alibaba.dubbo.rpc.Protocol.getDefaultPort() of interface com.alibaba.dubbo.rpc.Protocol is not adaptive method!"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> com.alibaba.dubbo.rpc.<span class="function">Exporter <span class="title">export</span><span class="params">(</span></span></span><br><span class="line"><span class="function"><span class="params">        com.alibaba.dubbo.rpc.Invoker arg0)</span></span></span><br><span class="line"><span class="function">        <span class="keyword">throws</span> com.alibaba.dubbo.rpc.RpcException </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (arg0 == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(</span><br><span class="line">                <span class="string">"com.alibaba.dubbo.rpc.Invoker argument == null"</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (arg0.getUrl() == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(</span><br><span class="line">                <span class="string">"com.alibaba.dubbo.rpc.Invoker argument getUrl() == null"</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        com.alibaba.dubbo.common.URL url = arg0.getUrl();</span><br><span class="line">        String extName = ((url.getProtocol() == <span class="keyword">null</span>) ? <span class="string">"dubbo"</span></span><br><span class="line">                                                      : url.getProtocol());</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (extName == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(</span><br><span class="line">                <span class="string">"Fail to get extension(com.alibaba.dubbo.rpc.Protocol) name from url("</span> +</span><br><span class="line">                url.toString() + <span class="string">") use keys([protocol])"</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        com.alibaba.dubbo.rpc.Protocol extension = (com.alibaba.dubbo.rpc.Protocol) ExtensionLoader.getExtensionLoader(com.alibaba.dubbo.rpc.Protocol<span class="class">.<span class="keyword">class</span>)</span></span><br><span class="line"><span class="class">                                                                                                   .<span class="title">getExtension</span>(<span class="title">extName</span>)</span>;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">return</span> extension.export(arg0);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> com.alibaba.dubbo.rpc.<span class="function">Invoker <span class="title">refer</span><span class="params">(java.lang.Class arg0,</span></span></span><br><span class="line"><span class="function"><span class="params">        com.alibaba.dubbo.common.URL arg1)</span></span></span><br><span class="line"><span class="function">        <span class="keyword">throws</span> com.alibaba.dubbo.rpc.RpcException </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (arg1 == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(<span class="string">"url == null"</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        com.alibaba.dubbo.common.URL url = arg1;</span><br><span class="line">      <span class="comment">// 其实前面所说的逻辑就在这里呈现了</span></span><br><span class="line">        String extName = ((url.getProtocol() == <span class="keyword">null</span>) ? <span class="string">"dubbo"</span></span><br><span class="line">                                                      : url.getProtocol());</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (extName == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(</span><br><span class="line">                <span class="string">"Fail to get extension(com.alibaba.dubbo.rpc.Protocol) name from url("</span> +</span><br><span class="line">                url.toString() + <span class="string">") use keys([protocol])"</span>);</span><br><span class="line">        &#125;</span><br><span class="line">				<span class="comment">// 在这就是实际的通过dubbo 的 spi 去加载实际对应的扩展</span></span><br><span class="line">        com.alibaba.dubbo.rpc.Protocol extension = (com.alibaba.dubbo.rpc.Protocol) ExtensionLoader.getExtensionLoader(com.alibaba.dubbo.rpc.Protocol<span class="class">.<span class="keyword">class</span>)</span></span><br><span class="line"><span class="class">                                                                                                   .<span class="title">getExtension</span>(<span class="title">extName</span>)</span>;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">return</span> extension.refer(arg0, arg1);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+
+      
+    </div>
+
+    
+    
+    
+      
+
+      <footer class="post-footer">
+        <div class="post-eof"></div>
+      </footer>
+  </article>
+  
+  
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     <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/05/31/%E8%81%8A%E8%81%8A-Dubbo-%E7%9A%84-SPI/">
 
@@ -676,126 +794,6 @@
   
   
 
-      
-  
-  
-  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
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-      <meta itemprop="name" content="Nicksxs's Blog">
-    </span>
-      <header class="post-header">
-        <h2 class="post-title" itemprop="name headline">
-          
-            <a href="/2020/05/02/%E8%81%8A%E8%81%8A-mysql-%E7%9A%84-MVCC-%E7%BB%AD%E7%AF%87/" class="post-title-link" itemprop="url">聊聊 mysql 的 MVCC 续篇</a>
-        </h2>
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-              <span class="post-meta-item-icon">
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-              <time title="Created: 2020-05-02 14:46:35" itemprop="dateCreated datePublished" datetime="2020-05-02T14:46:35+08:00">2020-05-02</time>
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-              <span class="post-meta-item">
-                <span class="post-meta-item-icon">
-                  <i class="far fa-calendar-check"></i>
-                </span>
-                <span class="post-meta-item-text">Edited on</span>
-                <time title="Modified: 2020-05-03 22:26:29" itemprop="dateModified" datetime="2020-05-03T22:26:29+08:00">2020-05-03</time>
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-            <span class="post-meta-item">
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-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Mysql/" itemprop="url" rel="index"><span itemprop="name">Mysql</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Mysql/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/" itemprop="url" rel="index"><span itemprop="name">数据结构</span></a>
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-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
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-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/C/Mysql/" itemprop="url" rel="index"><span itemprop="name">Mysql</span></a>
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-
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-      <span class="post-meta-item-text">Disqus: </span>
-    
-    <a title="disqus" href="/2020/05/02/%E8%81%8A%E8%81%8A-mysql-%E7%9A%84-MVCC-%E7%BB%AD%E7%AF%87/#disqus_thread" itemprop="discussionUrl">
-      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/05/02/聊聊-mysql-的-MVCC-续篇/" itemprop="commentCount"></span>
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-          <p>上一篇聊了mysql 的 innodb 引擎基于 read view 实现的 mvcc 和事务隔离级别，可能有些细心的小伙伴会发现一些问题，第一个是在 RC 级别下的事务提交后的可见性，这里涉及到了三个参数，m_low_limit_id，m_up_limit_id，m_ids，之前看到知乎的一篇写的非常不错的文章，但是就在这一点上似乎有点疑惑，这里基于源码和注释来解释下这个问题</p>
-<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment">Opens a read view where exactly the transactions serialized before this</span></span><br><span class="line"><span class="comment">point in time are seen in the view.</span></span><br><span class="line"><span class="comment">@param id		Creator transaction id */</span></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">ReadView::prepare</span><span class="params">(<span class="keyword">trx_id_t</span> id)</span> </span>&#123;</span><br><span class="line">  ut_ad(mutex_own(&amp;trx_sys-&gt;mutex));</span><br><span class="line"></span><br><span class="line">  m_creator_trx_id = id;</span><br><span class="line"></span><br><span class="line">  m_low_limit_no = m_low_limit_id = m_up_limit_id = trx_sys-&gt;max_trx_id;</span><br></pre></td></tr></table></figure>
-<p>m_low_limit_id赋的值是trx_sys-&gt;max_trx_id，代表的是当前系统最小的未分配的事务 id，所以呢，举个例子，当前有三个活跃事务，事务 id 分别是 100，200，300，而 m_up_limit_id = 100, m_low_limit_id = 301，当事务 id 是 200 的提交之后，它的更新就是可以被 100 和 300 看到，而不是说 m_ids 里没了 200，并且 200 比 100 大就应该不可见了</p>
-<h2 id="幻读"><a href="#幻读" class="headerlink" title="幻读"></a>幻读</h2><p>还有一个问题是幻读的问题，这貌似也是个高频面试题，啥意思呢，或者说跟它最常拿来比较的脏读，脏读是指读到了别的事务未提交的数据，因为未提交，严格意义上来讲，不一定是会被最后落到库里，可能会回滚，也就是在 read uncommitted 级别下会出现的问题，但是幻读不太一样，幻读是指两次查询的结果数量不一样，比如我查了第一次是 <code>select * from table1 where id &lt; 10 for update</code>,查出来了一条结果 id 是 5，然后再查一下发现出来了一条 id 是 5，一条 id 是 7，那是不是有点尴尬了，其实呢这个点我觉得脏读跟幻读也比较是从原理层面来命名，如果第一次接触的同学发觉有点不理解也比较正常，因为从逻辑上讲总之都是数据不符合预期，但是基于源码层面其实是不同的情况，幻读是在原先的 read view 无法完全解决的，怎么解决呢，简单的来说就是锁咯，我们知道innodb 是基于 record lock 行锁的，但是貌似没有办法解决这种问题，那么 innodb 就引入了 gap lock 间隙锁，比如上面说的情况下，id 小于 10 的情况下，是都应该锁住的，gap lock 其实是基于索引结构来锁的，因为索引树除了树形结构之外，还有一个next record 的指针，gap lock 也是基于这个来锁的<br>看一下 mysql 的文档</p>
-<blockquote>
-<p>SELECT … FOR UPDATE sets an exclusive next-key lock on every record the search encounters. However, only an index record lock is required for statements that lock rows using a unique index to search for a unique row.  </p>
-</blockquote>
-<p>对于一个 for update 查询，在 RR 级别下，会设置一个 next-key lock在每一条被查询到的记录上，next-lock 又是啥呢，其实就是 gap 锁和 record 锁的结合体，比如我在数据库里有 id 是 1，3，5，7，10，对于上面那条查询，查出来的结果就是 1，3，5，7，那么按照文档里描述的，对于这几条记录都会加上next-key lock，也就是(-∞, 1], (1, 3], (3, 5], (5, 7], (7, 10) 这些区间和记录会被锁起来，不让插入，再唠叨一下呢，就是其实如果是只读的事务，光 read view 一致性读就够了，如果是有写操作的呢，就需要锁了。</p>
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@@ -867,7 +865,7 @@
       <div class="site-state-item site-state-posts">
           <a href="/archives/">
         
-          <span class="site-state-item-count">82</span>
+          <span class="site-state-item-count">83</span>
           <span class="site-state-item-name">posts</span>
         </a>
       </div>
@@ -942,7 +940,7 @@
 <div class="copyright">
   
   &copy; 
-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
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diff --git a/page/8/index.html b/page/8/index.html
index 9588f40507..0b5261ef6d 100644
--- a/page/8/index.html
+++ b/page/8/index.html
@@ -203,6 +203,126 @@
       
   
   
+  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
+    <link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/05/02/%E8%81%8A%E8%81%8A-mysql-%E7%9A%84-MVCC-%E7%BB%AD%E7%AF%87/">
+
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+      <meta itemprop="image" content="/uploads/avatar.jpg">
+      <meta itemprop="name" content="Nicksxs">
+      <meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森">
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+      <meta itemprop="name" content="Nicksxs's Blog">
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+      <header class="post-header">
+        <h2 class="post-title" itemprop="name headline">
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+            <a href="/2020/05/02/%E8%81%8A%E8%81%8A-mysql-%E7%9A%84-MVCC-%E7%BB%AD%E7%AF%87/" class="post-title-link" itemprop="url">聊聊 mysql 的 MVCC 续篇</a>
+        </h2>
+
+        <div class="post-meta">
+            <span class="post-meta-item">
+              <span class="post-meta-item-icon">
+                <i class="far fa-calendar"></i>
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+              <span class="post-meta-item-text">Posted on</span>
+
+              <time title="Created: 2020-05-02 14:46:35" itemprop="dateCreated datePublished" datetime="2020-05-02T14:46:35+08:00">2020-05-02</time>
+            </span>
+              <span class="post-meta-item">
+                <span class="post-meta-item-icon">
+                  <i class="far fa-calendar-check"></i>
+                </span>
+                <span class="post-meta-item-text">Edited on</span>
+                <time title="Modified: 2020-05-03 22:26:29" itemprop="dateModified" datetime="2020-05-03T22:26:29+08:00">2020-05-03</time>
+              </span>
+            <span class="post-meta-item">
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+              <span class="post-meta-item-text">In</span>
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Mysql/" itemprop="url" rel="index"><span itemprop="name">Mysql</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Mysql/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/" itemprop="url" rel="index"><span itemprop="name">数据结构</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/C/" itemprop="url" rel="index"><span itemprop="name">C</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Mysql/%E6%BA%90%E7%A0%81/" itemprop="url" rel="index"><span itemprop="name">源码</span></a>
+                </span>
+                  , 
+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/C/Mysql/" itemprop="url" rel="index"><span itemprop="name">Mysql</span></a>
+                </span>
+            </span>
+
+          
+            <span id="/2020/05/02/%E8%81%8A%E8%81%8A-mysql-%E7%9A%84-MVCC-%E7%BB%AD%E7%AF%87/" class="post-meta-item leancloud_visitors" data-flag-title="聊聊 mysql 的 MVCC 续篇" title="Views">
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+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/05/02/聊聊-mysql-的-MVCC-续篇/" itemprop="commentCount"></span>
+    </a>
+  </span>
+  
+  
+
+        </div>
+      </header>
+
+    
+    
+    
+    <div class="post-body" itemprop="articleBody">
+
+      
+          <p>上一篇聊了mysql 的 innodb 引擎基于 read view 实现的 mvcc 和事务隔离级别，可能有些细心的小伙伴会发现一些问题，第一个是在 RC 级别下的事务提交后的可见性，这里涉及到了三个参数，m_low_limit_id，m_up_limit_id，m_ids，之前看到知乎的一篇写的非常不错的文章，但是就在这一点上似乎有点疑惑，这里基于源码和注释来解释下这个问题</p>
+<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment">Opens a read view where exactly the transactions serialized before this</span></span><br><span class="line"><span class="comment">point in time are seen in the view.</span></span><br><span class="line"><span class="comment">@param id		Creator transaction id */</span></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">ReadView::prepare</span><span class="params">(<span class="keyword">trx_id_t</span> id)</span> </span>&#123;</span><br><span class="line">  ut_ad(mutex_own(&amp;trx_sys-&gt;mutex));</span><br><span class="line"></span><br><span class="line">  m_creator_trx_id = id;</span><br><span class="line"></span><br><span class="line">  m_low_limit_no = m_low_limit_id = m_up_limit_id = trx_sys-&gt;max_trx_id;</span><br></pre></td></tr></table></figure>
+<p>m_low_limit_id赋的值是trx_sys-&gt;max_trx_id，代表的是当前系统最小的未分配的事务 id，所以呢，举个例子，当前有三个活跃事务，事务 id 分别是 100，200，300，而 m_up_limit_id = 100, m_low_limit_id = 301，当事务 id 是 200 的提交之后，它的更新就是可以被 100 和 300 看到，而不是说 m_ids 里没了 200，并且 200 比 100 大就应该不可见了</p>
+<h2 id="幻读"><a href="#幻读" class="headerlink" title="幻读"></a>幻读</h2><p>还有一个问题是幻读的问题，这貌似也是个高频面试题，啥意思呢，或者说跟它最常拿来比较的脏读，脏读是指读到了别的事务未提交的数据，因为未提交，严格意义上来讲，不一定是会被最后落到库里，可能会回滚，也就是在 read uncommitted 级别下会出现的问题，但是幻读不太一样，幻读是指两次查询的结果数量不一样，比如我查了第一次是 <code>select * from table1 where id &lt; 10 for update</code>,查出来了一条结果 id 是 5，然后再查一下发现出来了一条 id 是 5，一条 id 是 7，那是不是有点尴尬了，其实呢这个点我觉得脏读跟幻读也比较是从原理层面来命名，如果第一次接触的同学发觉有点不理解也比较正常，因为从逻辑上讲总之都是数据不符合预期，但是基于源码层面其实是不同的情况，幻读是在原先的 read view 无法完全解决的，怎么解决呢，简单的来说就是锁咯，我们知道innodb 是基于 record lock 行锁的，但是貌似没有办法解决这种问题，那么 innodb 就引入了 gap lock 间隙锁，比如上面说的情况下，id 小于 10 的情况下，是都应该锁住的，gap lock 其实是基于索引结构来锁的，因为索引树除了树形结构之外，还有一个next record 的指针，gap lock 也是基于这个来锁的<br>看一下 mysql 的文档</p>
+<blockquote>
+<p>SELECT … FOR UPDATE sets an exclusive next-key lock on every record the search encounters. However, only an index record lock is required for statements that lock rows using a unique index to search for a unique row.  </p>
+</blockquote>
+<p>对于一个 for update 查询，在 RR 级别下，会设置一个 next-key lock在每一条被查询到的记录上，next-lock 又是啥呢，其实就是 gap 锁和 record 锁的结合体，比如我在数据库里有 id 是 1，3，5，7，10，对于上面那条查询，查出来的结果就是 1，3，5，7，那么按照文档里描述的，对于这几条记录都会加上next-key lock，也就是(-∞, 1], (1, 3], (3, 5], (5, 7], (7, 10) 这些区间和记录会被锁起来，不让插入，再唠叨一下呢，就是其实如果是只读的事务，光 read view 一致性读就够了，如果是有写操作的呢，就需要锁了。</p>
+
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-                  <a href="/categories/Linux/%E5%91%BD%E4%BB%A4/" itemprop="url" rel="index"><span itemprop="name">命令</span></a>
-                </span>
-                  , 
-                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
-                  <a href="/categories/Linux/%E5%91%BD%E4%BB%A4/echo/" itemprop="url" rel="index"><span itemprop="name">echo</span></a>
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-          <p>最近做 docker 系列，会经常进到 docker 内部，如上一篇介绍的，这些镜像一般都有用 ubuntu 或者alpine 这样的 Linux 系统作为底包，如果构建镜像的时候没有替换源的话，因为你懂的原因，在内部想编辑下东西要安装 vim 就会很慢很慢，thousand years later~<br>而且如果在容器内部想改源配置的话也要编辑器，就陷入了一个鸡生蛋，跟蛋生鸡的问题中，对于 linux 大神来说应该有一万种方法解决这个问题，对于我这个渣渣来说可能只想到了这个土方法，先 cp backup 一下 sources.list, 再 echo “xxx” &gt; sources.list, 这里就碰到了一个问题，这个 sources.list 一般不止一行，直接 echo 的话就解析不了了，不过 echo 可以支持”\n”转义，就是加-e<br>看一下解释和示例<br><img data-src="https://i.loli.net/2020/03/23/4vlxSOuR2DdF5kp.png" alt=""><br>还有一点也是在这个时候要安装 vim 之类的，得知道是什么镜像底包，如果是用 uname 指令，其实看到的是宿主机的系统，得用<code>cat /etc/issue</code><br><img data-src="https://i.loli.net/2020/03/29/mh5YxdDnX3VSkg8.png" alt=""><br>这里稍稍记一下</p>
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+          <span class="site-state-item-count">83</span>
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@@ -955,7 +969,7 @@
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diff --git a/page/9/index.html b/page/9/index.html
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+++ b/page/9/index.html
@@ -203,6 +203,112 @@
       
   
   
+  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-Hans">
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+        </h2>
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+            <span class="post-meta-item">
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+                </span>
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+                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
+                  <a href="/categories/Docker/" itemprop="url" rel="index"><span itemprop="name">Docker</span></a>
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+                  <a href="/categories/Linux/%E5%91%BD%E4%BB%A4/" itemprop="url" rel="index"><span itemprop="name">命令</span></a>
+                </span>
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+
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+      <span class="post-comments-count disqus-comment-count" data-disqus-identifier="2020/03/29/echo命令的一个小技巧/" itemprop="commentCount"></span>
+    </a>
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+  
+
+        </div>
+      </header>
+
+    
+    
+    
+    <div class="post-body" itemprop="articleBody">
+
+      
+          <p>最近做 docker 系列，会经常进到 docker 内部，如上一篇介绍的，这些镜像一般都有用 ubuntu 或者alpine 这样的 Linux 系统作为底包，如果构建镜像的时候没有替换源的话，因为你懂的原因，在内部想编辑下东西要安装 vim 就会很慢很慢，thousand years later~<br>而且如果在容器内部想改源配置的话也要编辑器，就陷入了一个鸡生蛋，跟蛋生鸡的问题中，对于 linux 大神来说应该有一万种方法解决这个问题，对于我这个渣渣来说可能只想到了这个土方法，先 cp backup 一下 sources.list, 再 echo “xxx” &gt; sources.list, 这里就碰到了一个问题，这个 sources.list 一般不止一行，直接 echo 的话就解析不了了，不过 echo 可以支持”\n”转义，就是加-e<br>看一下解释和示例<br><img data-src="https://i.loli.net/2020/03/23/4vlxSOuR2DdF5kp.png" alt=""><br>还有一点也是在这个时候要安装 vim 之类的，得知道是什么镜像底包，如果是用 uname 指令，其实看到的是宿主机的系统，得用<code>cat /etc/issue</code><br><img data-src="https://i.loli.net/2020/03/29/mh5YxdDnX3VSkg8.png" alt=""><br>这里稍稍记一下</p>
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-          <p>众所周知，我是个前端彩笔，但是也想做点自己可以用的工具页面，所以就让朋友推荐了蚂蚁出品的 ant design，说基本可以直接 ctrl-c ctrl-v，实测对我这种来说还是有点难的，不过也能写点，但是现在碰到的问题是怎么部署到自己的服务器上去<br>用 ant design 写的是个单页应用，实际来说就是一个 html 加 css 跟 js，最初的时候是直接 build 完就 scp 上去，也考虑过 rsync 之类的，但是都感觉不够自动化，正好自己还没这方面的经验就想折腾下，因为我自己搭的仓库应用是 gogs，搜了一下主要是跟 drones 配合做 ci/cd，研究了一下发现其实这个事情没必要这么搞(PS：drone 也不好用)，整个 hook 就可以了, 但是实际上呢，这东西也不是那么简单<br>首先是需要在服务器上装 <a href="https://github.com/adnanh/webhook" target="_blank" rel="noopener">webhook</a>，这个我一开始用 snap 安装，但是出现问题，run 的时候会出现后面参数带的 hooks.json 文件找不到，然后索性就直接 github 上下最新版，放 /usr/local/bin 了，webhook 的原理呢其实也比较简单，就是起一个 http 服务，通过 post 请求调用，解析下参数，如果跟配置的参数一致，就调用对应的命令或者脚本。</p>
-<h2 id="配置-hooks-json"><a href="#配置-hooks-json" class="headerlink" title="配置 hooks.json"></a>配置 hooks.json</h2><p>webhook 的配置，需要的两个文件，一个是 hooks.json，这个是 webhook 服务的配置文件，像这样</p>
-<figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br></pre></td><td class="code"><pre><span class="line">[</span><br><span class="line">  &#123;</span><br><span class="line">    <span class="attr">"id"</span>: <span class="string">"redeploy-app"</span>,</span><br><span class="line">    <span class="attr">"execute-command"</span>: <span class="string">"/opt/scripts/redeploy.sh"</span>,</span><br><span class="line">    <span class="attr">"command-working-directory"</span>: <span class="string">"/opt/scripts"</span>,</span><br><span class="line">    <span class="attr">"pass-arguments-to-command"</span>:</span><br><span class="line">    [</span><br><span class="line">      &#123;</span><br><span class="line">        <span class="attr">"source"</span>: <span class="string">"payload"</span>,</span><br><span class="line">        <span class="attr">"name"</span>: <span class="string">"head_commit.message"</span></span><br><span class="line">      &#125;,</span><br><span class="line">      &#123;</span><br><span class="line">        <span class="attr">"source"</span>: <span class="string">"payload"</span>,</span><br><span class="line">        <span class="attr">"name"</span>: <span class="string">"pusher.name"</span></span><br><span class="line">      &#125;,</span><br><span class="line">      &#123;</span><br><span class="line">        <span class="attr">"source"</span>: <span class="string">"payload"</span>,</span><br><span class="line">        <span class="attr">"name"</span>: <span class="string">"head_commit.id"</span></span><br><span class="line">      &#125;</span><br><span class="line">    ],</span><br><span class="line">    <span class="attr">"trigger-rule"</span>:</span><br><span class="line">    &#123;</span><br><span class="line">      <span class="attr">"and"</span>:</span><br><span class="line">      [</span><br><span class="line">        &#123;</span><br><span class="line">          <span class="attr">"match"</span>:</span><br><span class="line">          &#123;</span><br><span class="line">            <span class="attr">"type"</span>: <span class="string">"payload-hash-sha1"</span>,</span><br><span class="line">            <span class="attr">"secret"</span>: <span class="string">"your-github-secret"</span>,</span><br><span class="line">            <span class="attr">"parameter"</span>:</span><br><span class="line">            &#123;</span><br><span class="line">              <span class="attr">"source"</span>: <span class="string">"header"</span>,</span><br><span class="line">              <span class="attr">"name"</span>: <span class="string">"X-Hub-Signature"</span></span><br><span class="line">            &#125;</span><br><span class="line">          &#125;</span><br><span class="line">        &#125;,</span><br><span class="line">        &#123;</span><br><span class="line">          <span class="attr">"match"</span>:</span><br><span class="line">          &#123;</span><br><span class="line">            <span class="attr">"type"</span>: <span class="string">"value"</span>,</span><br><span class="line">            <span class="attr">"value"</span>: <span class="string">"refs/heads/master"</span>,</span><br><span class="line">            <span class="attr">"parameter"</span>:</span><br><span class="line">            &#123;</span><br><span class="line">              <span class="attr">"source"</span>: <span class="string">"payload"</span>,</span><br><span class="line">              <span class="attr">"name"</span>: <span class="string">"ref"</span></span><br><span class="line">            &#125;</span><br><span class="line">          &#125;</span><br><span class="line">        &#125;</span><br><span class="line">      ]</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">]</span><br></pre></td></tr></table></figure>
-
-<p>这是个跟 github搭配的示例，首先 id 表示的是这个对应 hook 的识别 id，也可以看到这个 hooks.json 的结构是这样的一个数组，然后就是要执行的命令和命令执行的参数，值得注意的是这个<code>trigger-rule</code>,就是请求进来了回去匹配里面的，比如前一个是一个加密的，放在请求头里，第二个 match 表示请求里的 ref 是个 master 分支，就可以区分分支进行不同操作，但是前面的加密配合 gogs 使用的时候有个问题(PS: webhook 的文档是真的烂)，gogs 设置 webhook 的加密是用的</p>
-<blockquote>
-<p>密钥文本将被用于计算推送内容的 SHA256 HMAC 哈希值，并设置为 <code>X-Gogs-Signature</code> 请求头的值。</p>
-</blockquote>
-<p>这种加密方式，所以 webhook 的这个示例的加密方式不行，但这货的文档里居然没有说明支持哪些加密，神TM，后来还是翻 <a href="https://github.com/adnanh/webhook/issues/289" target="_blank" rel="noopener">issue</a> 翻到了, 需要使用这个<code>payload-hash-sha256</code></p>
-<h2 id="执行脚本-redeploy-sh"><a href="#执行脚本-redeploy-sh" class="headerlink" title="执行脚本 redeploy.sh"></a>执行脚本 redeploy.sh</h2><p>脚本类似于这样</p>
-<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#</span><span class="bash">!/bin/bash -e</span></span><br><span class="line"></span><br><span class="line">function cleanup &#123;</span><br><span class="line">      echo "Error occoured"</span><br><span class="line">&#125;</span><br><span class="line">trap cleanup ERR</span><br><span class="line"></span><br><span class="line">commit_message=$1 # head_commit.message</span><br><span class="line">pusher_name=$2 # pusher.name</span><br><span class="line">commit_id=$3 # head_commit.id</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">cd ~/do-react-example-app/</span><br><span class="line">git pull origin master</span><br><span class="line">yarn &amp;&amp; yarn build</span><br></pre></td></tr></table></figure>
-
-<p>就是简单的拉代码，然后构建下，真实使用时可能不是这样，因为页面会部署在 nginx 的作用目录，还需要 rsync 过去，这部分可能还涉及到两个问题第一个是使用 rsync 还是其他的 cp，不过这个无所谓；第二个是目录权限的问题，以我的系统ubuntu 为例，默认用户是 ubuntu，nginx 部署的目录是 www，所以需要切换用户等操作，一开始是想用在shell 文件中直接写了密码，但是不知道咋传，查了下是类似于这样 <code>echo &quot;passwd&quot; | sudo -S cmd</code>，通过管道命令往后传，然后就是这个<code>-S</code>, 参数的解释是<code>-S, --stdin                 read password from standard input</code>,但是这样么也不是太安全的赶脚，又看了下还有两种方法，</p>
-<ul>
-<li><p>就是给root 设置一个不需要密码的命令类似于这样，</p>
-<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">myusername ALL = (ALL) ALL</span><br><span class="line">myusername ALL = (root) NOPASSWD: /path/to/my/program</span><br></pre></td></tr></table></figure>
-</li>
-<li><p>另一种就是把默认用户跟 root 设置成同一个 group 的</p>
-</li>
-</ul>
-<h2 id="使用"><a href="#使用" class="headerlink" title="使用"></a>使用</h2><p>真正实操的时候其实还有不少问题，首先运行 webhook 就碰到了我前面说的，使用 snap 运行的时候会找不到前面的 hooks.json配置文件，执行<code>snap run webhook -hooks /opt/hooks/hooks.json -verbose</code>就碰到下面的<code>couldn&#39;t load hooks from file! open /opt/hooks/hooks.json: no such file or directory</code>，后来直接下了个官方最新的 release，就直接执行 <code>webhook -hooks /opt/hooks/hooks.json -verbose</code> 就可以了，然后是前面的示例配置文件里的几个参数，比如<code>head_commit.message</code> 其实 gogs 推过来的根本没这玩意，而且都是数组，不知道咋取，烂文档，不过总比搭个 drone 好一点就忍了。补充一点就是在 debug 的时候需要看下问题出在哪，看看脚本有没有执行，所以需要在前面的 json 里加这个参数<code>&quot;include-command-output-in-response&quot;: true</code>, 就能输出来脚本执行结果</p>
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+          <span class="site-state-item-count">83</span>
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-  <span itemprop="copyrightYear">2020</span>
+  <span itemprop="copyrightYear">2021</span>
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+    <loc>https://nicksxs.me/2014/12/23/my-new-post/</loc>
     
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   </url>
   
   <url>
-    <loc>https://nicksxs.me/2015/06/22/invert-binary-tree/</loc>
+    <loc>https://nicksxs.me/2019/09/23/AbstractQueuedSynchronizer/</loc>
     
     <lastmod>2020-01-12T13:08:26.000Z</lastmod>
     
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index ce87dfdcfb..3d0d11c8ad 100644
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index bd64e7061f..76fd254560 100644
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index 811b4af607..3f914f22a1 100644
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index f052fdb825..3e3155bac8 100644
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index 7feb7c4ef9..6443ca08e0 100644
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index 96cc0958b6..0448e0098a 100644
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index 4a34ba8c9b..d0cd7b0ec1 100644
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index c81a61c934..a7bdaf3f93 100644
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+  <span itemprop="copyrightYear">2021</span>
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diff --git a/tags/index.html b/tags/index.html
index f70d20dab5..98d24495b6 100644
--- a/tags/index.html
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diff --git a/tags/is-not-null/index.html b/tags/is-not-null/index.html
index 10e6931367..f573862e90 100644
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diff --git a/tags/is-null/index.html b/tags/is-null/index.html
index 9ee4a3251a..103a935bcf 100644
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diff --git a/tags/java/index.html b/tags/java/index.html
index 9364ee4bc6..98f01e7f5c 100644
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 <meta property="og:title" content="Nicksxs&#39;s Blog">
-<meta property="og:url" content="https://nicksxs.me/tags/Java/index.html">
+<meta property="og:url" content="https://nicksxs.me/tags/java/index.html">
 <meta property="og:site_name" content="Nicksxs&#39;s Blog">
 <meta property="og:description" content="learn from zero,技术博客，Nicksxs，史学森">
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@@ -40,7 +40,7 @@
 <meta property="article:tag" content="森哥">
 <meta name="twitter:card" content="summary">
 
-<link rel="canonical" href="https://nicksxs.me/tags/Java/">
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 <script id="page-configurations">
@@ -53,7 +53,7 @@
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-  <title>Tag: Java | Nicksxs's Blog</title>
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@@ -207,7 +207,7 @@
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@@ -222,15 +222,15 @@
 
       <div class="post-meta">
         <time itemprop="dateCreated"
-              datetime="2020-11-22T21:37:55+08:00"
-              content="2020-11-22">
-          11-22
+              datetime="2020-12-13T21:19:43+08:00"
+              content="2020-12-13">
+          12-13
         </time>
       </div>
 
       <div class="post-title">
-          <a class="post-title-link" href="/2020/11/22/%E8%81%8A%E8%81%8A-Dubbo-%E7%9A%84%E5%AE%B9%E9%94%99%E6%9C%BA%E5%88%B6/" itemprop="url">
-            <span itemprop="name">聊聊 Dubbo 的容错机制</span>
+          <a class="post-title-link" href="/2020/12/13/Leetcode-105-%E4%BB%8E%E5%89%8D%E5%BA%8F%E4%B8%8E%E4%B8%AD%E5%BA%8F%E9%81%8D%E5%8E%86%E5%BA%8F%E5%88%97%E6%9E%84%E9%80%A0%E4%BA%8C%E5%8F%89%E6%A0%91-Construct-Binary-Tree-from-Preorder-and-Inorder-Traversal-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" itemprop="url">
+            <span itemprop="name">Leetcode 105 从前序与中序遍历序列构造二叉树(Construct Binary Tree from Preorder and Inorder Traversal) 题解分析</span>
           </a>
       </div>
 
@@ -242,15 +242,15 @@
 
       <div class="post-meta">
         <time itemprop="dateCreated"
-              datetime="2020-11-01T23:26:43+08:00"
-              content="2020-11-01">
-          11-01
+              datetime="2020-12-06T21:55:55+08:00"
+              content="2020-12-06">
+          12-06
         </time>
       </div>
 
       <div class="post-title">
-          <a class="post-title-link" href="/2020/11/01/Apollo-%E7%9A%84-value-%E6%B3%A8%E8%A7%A3%E6%98%AF%E6%80%8E%E4%B9%88%E8%87%AA%E5%8A%A8%E6%9B%B4%E6%96%B0%E7%9A%84/" itemprop="url">
-            <span itemprop="name">Apollo 的 value 注解是怎么自动更新的</span>
+          <a class="post-title-link" href="/2020/12/06/Leetcode-155-%E6%9C%80%E5%B0%8F%E6%A0%88-Min-Stack-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" itemprop="url">
+            <span itemprop="name">Leetcode 155 最小栈(Min Stack) 题解分析</span>
           </a>
       </div>
 
@@ -262,15 +262,15 @@
 
       <div class="post-meta">
         <time itemprop="dateCreated"
-              datetime="2020-10-03T22:43:13+08:00"
-              content="2020-10-03">
-          10-03
+              datetime="2020-11-15T23:47:20+08:00"
+              content="2020-11-15">
+          11-15
         </time>
       </div>
 
       <div class="post-title">
-          <a class="post-title-link" href="/2020/10/03/mybatis-%E7%9A%84%E7%BC%93%E5%AD%98%E6%98%AF%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B/" itemprop="url">
-            <span itemprop="name">mybatis 的缓存是怎么回事</span>
+          <a class="post-title-link" href="/2020/11/15/Leetcode-234-%E5%9B%9E%E6%96%87%E8%81%94%E8%A1%A8-Palindrome-Linked-List-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" itemprop="url">
+            <span itemprop="name">Leetcode 234 回文链表(Palindrome Linked List) 题解分析</span>
           </a>
       </div>
 
@@ -282,15 +282,15 @@
 
       <div class="post-meta">
         <time itemprop="dateCreated"
-              datetime="2020-09-06T23:14:50+08:00"
-              content="2020-09-06">
-          09-06
+              datetime="2020-10-25T23:43:29+08:00"
+              content="2020-10-25">
+          10-25
         </time>
       </div>
 
       <div class="post-title">
-          <a class="post-title-link" href="/2020/09/06/mybatis-%E7%9A%84-%E5%92%8C-%E6%98%AF%E6%9C%89%E5%95%A5%E5%8C%BA%E5%88%AB/" itemprop="url">
-            <span itemprop="name">mybatis 的 $ 和 # 是有啥区别</span>
+          <a class="post-title-link" href="/2020/10/25/Leetcode-104-%E4%BA%8C%E5%8F%89%E6%A0%91%E7%9A%84%E6%9C%80%E5%A4%A7%E6%B7%B1%E5%BA%A6-Maximum-Depth-of-Binary-Tree-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" itemprop="url">
+            <span itemprop="name">Leetcode 104 二叉树的最大深度(Maximum Depth of Binary Tree) 题解分析</span>
           </a>
       </div>
 
@@ -302,15 +302,15 @@
 
       <div class="post-meta">
         <time itemprop="dateCreated"
-              datetime="2020-08-22T20:44:32+08:00"
-              content="2020-08-22">
-          08-22
+              datetime="2020-10-11T23:22:45+08:00"
+              content="2020-10-11">
+          10-11
         </time>
       </div>
 
       <div class="post-title">
-          <a class="post-title-link" href="/2020/08/22/Filter-Intercepter-Aop-%E5%95%A5-%E5%95%A5-%E5%95%A5-%E8%BF%99%E4%BA%9B%E9%83%BD%E6%98%AF%E5%95%A5/" itemprop="url">
-            <span itemprop="name">Filter, Interceptor, Aop, 啥, 啥, 啥? 这些都是啥?</span>
+          <a class="post-title-link" href="/2020/10/11/Leetcode-2-Add-Two-Numbers-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" itemprop="url">
+            <span itemprop="name">Leetcode 2 Add Two Numbers 题解分析</span>
           </a>
       </div>
 
@@ -322,95 +322,38 @@
 
       <div class="post-meta">
         <time itemprop="dateCreated"
-              datetime="2020-08-02T21:13:59+08:00"
-              content="2020-08-02">
-          08-02
+              datetime="2020-09-20T21:40:23+08:00"
+              content="2020-09-20">
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       </div>
 
       <div class="post-title">
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-            <span itemprop="name">聊聊 Java 自带的那些*逆天*工具</span>
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-
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-              datetime="2020-06-06T22:39:38+08:00"
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-          06-06
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-            <span itemprop="name">聊聊 Dubbo 的 SPI 续之自适应拓展</span>
-          </a>
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-
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-  </article>
-
-  <article itemscope itemtype="http://schema.org/Article">
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-      <div class="post-meta">
-        <time itemprop="dateCreated"
-              datetime="2020-05-31T21:06:13+08:00"
-              content="2020-05-31">
-          05-31
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-      <div class="post-title">
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-            <span itemprop="name">聊聊 Dubbo 的 SPI</span>
-          </a>
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-
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-  </article>
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-  <article itemscope itemtype="http://schema.org/Article">
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-      <div class="post-meta">
-        <time itemprop="dateCreated"
-              datetime="2020-05-22T23:26:50+08:00"
-              content="2020-05-22">
-          05-22
-        </time>
-      </div>
-
-      <div class="post-title">
-          <a class="post-title-link" href="/2020/05/22/%E8%81%8A%E8%81%8A%E6%88%91%E5%88%9A%E5%AD%A6%E4%BC%9A%E7%9A%84%E5%BA%94%E7%94%A8%E8%AF%8A%E6%96%AD%E6%96%B9%E6%B3%95/" itemprop="url">
-            <span itemprop="name">聊聊我刚学会的应用诊断方法</span>
+          <a class="post-title-link" href="/2020/09/20/Leetcode-3-Longest-Substring-Without-Repeating-Characters-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" itemprop="url">
+            <span itemprop="name">Leetcode 3 Longest Substring Without Repeating Characters 题解分析</span>
           </a>
       </div>
 
     </header>
   </article>
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       <div class="post-meta">
         <time itemprop="dateCreated"
-              datetime="2020-04-05T21:41:41+08:00"
-              content="2020-04-05">
-          04-05
+              datetime="2019-09-23T23:40:05+08:00"
+              content="2019-09-23">
+          09-23
         </time>
       </div>
 
       <div class="post-title">
-          <a class="post-title-link" href="/2020/04/05/Comparator%E4%BD%BF%E7%94%A8%E5%B0%8F%E8%AE%B0/" itemprop="url">
-            <span itemprop="name">Comparator使用小记</span>
+          <a class="post-title-link" href="/2019/09/23/AbstractQueuedSynchronizer/" itemprop="url">
+            <span itemprop="name">AbstractQueuedSynchronizer</span>
           </a>
       </div>
 
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@@ -568,7 +508,7 @@
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+  <span itemprop="copyrightYear">2021</span>
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index 08df00f1ea..e73e38ac97 100644
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diff --git a/tags/leetcode/index.html b/tags/leetcode/index.html
index 91219771b9..559830bec8 100644
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index 0164124428..c10bc1ad7e 100644
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diff --git a/tags/linked-list/index.html b/tags/linked-list/index.html
index d46348d3c3..404d7873a5 100644
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diff --git a/tags/linux/index.html b/tags/linux/index.html
index b4982d05ce..0a66320993 100644
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index e1888713e7..1fecc6ab51 100644
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