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<a 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/" class="post-title-link" itemprop="url">聊聊 Dubbo 的容错机制</a>
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<time title="Created: 2020-11-22 21:37:55" itemprop="dateCreated datePublished" datetime="2020-11-22T21:37:55+08:00">2020-11-22</time>
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,
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,
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<p>之前看了 dubbo 的一些代码，在学习过程中，主要关注那些比较“高级”的内容，SPI，自适应扩展等，却忘了一些作为一个 rpc 框架最核心需要的部分，比如如何通信，序列化，网络，容错机制等等，因为其实这个最核心的就是远程调用，自适应扩展其实就是让代码可扩展性，可读性，更优雅等，写的搓一点其实也问题不大，但是一个合适的通信协议，序列化方法，如何容错等却是真正保证是一个 rpc 框架最重要的要素。<br>首先来看这张图<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/cluster.jpg" alt="cluster"><br>在集群调用失败时，Dubbo 提供了多种容错方案，缺省为 failover 重试。<br>各节点关系：</p>
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<ul>
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<li>这里的 <code>Invoker</code> 是 <code>Provider</code> 的一个可调用 <code>Service</code> 的抽象，<code>Invoker</code> 封装了 <code>Provider</code> 地址及 <code>Service</code> 接口信息</li>
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<li><code>Directory</code> 代表多个 <code>Invoker</code>，可以把它看成 <code>List<Invoker></code> ，但与 <code>List</code> 不同的是，它的值可能是动态变化的，比如注册中心推送变更</li>
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<li><code>Cluster</code> 将 <code>Directory</code> 中的多个 <code>Invoker</code> 伪装成一个 <code>Invoker</code>，对上层透明，伪装过程包含了容错逻辑，调用失败后，重试另一个</li>
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<li><code>Router</code> 负责从多个 <code>Invoker</code> 中按路由规则选出子集，比如读写分离，应用隔离等</li>
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<li><code>LoadBalance</code> 负责从多个 <code>Invoker</code> 中选出具体的一个用于本次调用，选的过程包含了负载均衡算法，调用失败后，需要重选</li>
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</ul>
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<h2 id="集群容错模式"><a href="#集群容错模式" class="headerlink" title="集群容错模式"></a>集群容错模式</h2><h3 id="Failover-Cluster"><a href="#Failover-Cluster" class="headerlink" title="Failover Cluster"></a>Failover Cluster</h3><p>失败自动切换，当出现失败，重试其它服务器 1。通常用于读操作，但重试会带来更长延迟。可通过 retries=”2” 来设置重试次数(不含第一次)。</p>
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<p>重试次数配置如下：</p>
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<p><dubbo:service retries=”2” /><br>这里重点看下 <code>Failover Cluster</code>集群模式的实现 </p>
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<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">FailoverCluster</span> <span class="token keyword">implements</span> <span class="token class-name">Cluster</span> <span class="token punctuation">{</span>
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<span class="token keyword">public</span> <span class="token keyword">final</span> <span class="token keyword">static</span> <span class="token class-name">String</span> NAME <span class="token operator">=</span> <span class="token string">"failover"</span><span class="token punctuation">;</span>
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<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token class-name">Invoker</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token function">join</span><span class="token punctuation">(</span><span class="token class-name">Directory</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span> directory<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">RpcException</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">FailoverClusterInvoker</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span><span class="token punctuation">(</span>directory<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>这个代码就非常简单，重点需要看<code>FailoverClusterInvoker</code>里的代码，<code>FailoverClusterInvoker</code>继承了<code>AbstractClusterInvoker</code>类，其中invoke 方法是在抽象类里实现的</p>
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<pre class="line-numbers language-Java" data-language="Java"><code class="language-Java">@Override
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public Result invoke(final Invocation invocation) throws RpcException {
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checkWhetherDestroyed();
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// binding attachments into invocation.
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// 绑定 attachments 到 invocation 中.
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Map<String, Object> contextAttachments = RpcContext.getContext().getObjectAttachments();
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if (contextAttachments != null && contextAttachments.size() != 0) {
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((RpcInvocation) invocation).addObjectAttachments(contextAttachments);
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}
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// 列举 Invoker
|
|
List<Invoker<T>> invokers = list(invocation);
|
|
// 加载 LoadBalance 负载均衡器
|
|
LoadBalance loadbalance = initLoadBalance(invokers, invocation);
|
|
RpcUtils.attachInvocationIdIfAsync(getUrl(), invocation);
|
|
// 调用 实际的 doInvoke 进行后续操作
|
|
return doInvoke(invocation, invokers, loadbalance);
|
|
}
|
|
// 这是个抽象方法，实际是由子类实现的
|
|
protected abstract Result doInvoke(Invocation invocation, List<Invoker<T>> invokers,
|
|
LoadBalance loadbalance) throws RpcException;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
|
|
<p>然后重点就是<code>FailoverClusterInvoker</code>中的<code>doInvoke</code>方法了，其实它里面也就这么一个方法</p>
|
|
<pre class="line-numbers language-Java" data-language="Java"><code class="language-Java">@Override
|
|
@SuppressWarnings({"unchecked", "rawtypes"})
|
|
public Result doInvoke(Invocation invocation, final List<Invoker<T>> invokers, LoadBalance loadbalance) throws RpcException {
|
|
List<Invoker<T>> copyInvokers = invokers;
|
|
checkInvokers(copyInvokers, invocation);
|
|
String methodName = RpcUtils.getMethodName(invocation);
|
|
// 获取重试次数，这里默认是 2 次，还有可以注意下后面的+1
|
|
int len = getUrl().getMethodParameter(methodName, RETRIES_KEY, DEFAULT_RETRIES) + 1;
|
|
if (len <= 0) {
|
|
len = 1;
|
|
}
|
|
// retry loop.
|
|
RpcException le = null; // last exception.
|
|
List<Invoker<T>> invoked = new ArrayList<Invoker<T>>(copyInvokers.size()); // invoked invokers.
|
|
Set<String> providers = new HashSet<String>(len);
|
|
// 循环调用，失败重试
|
|
for (int i = 0; i < len; i++) {
|
|
//Reselect before retry to avoid a change of candidate `invokers`.
|
|
//NOTE: if `invokers` changed, then `invoked` also lose accuracy.
|
|
if (i > 0) {
|
|
checkWhetherDestroyed();
|
|
// 在进行重试前重新列举 Invoker，这样做的好处是，如果某个服务挂了，
|
|
// 通过调用 list 可得到最新可用的 Invoker 列表
|
|
copyInvokers = list(invocation);
|
|
// check again
|
|
// 对 copyinvokers 进行判空检查
|
|
checkInvokers(copyInvokers, invocation);
|
|
}
|
|
// 通过负载均衡来选择 invoker
|
|
Invoker<T> invoker = select(loadbalance, invocation, copyInvokers, invoked);
|
|
// 将其添加到 invoker 到 invoked 列表中
|
|
invoked.add(invoker);
|
|
// 设置上下文
|
|
RpcContext.getContext().setInvokers((List) invoked);
|
|
try {
|
|
// 正式调用
|
|
Result result = invoker.invoke(invocation);
|
|
if (le != null && logger.isWarnEnabled()) {
|
|
logger.warn("Although retry the method " + methodName
|
|
+ " in the service " + getInterface().getName()
|
|
+ " was successful by the provider " + invoker.getUrl().getAddress()
|
|
+ ", but there have been failed providers " + providers
|
|
+ " (" + providers.size() + "/" + copyInvokers.size()
|
|
+ ") from the registry " + directory.getUrl().getAddress()
|
|
+ " on the consumer " + NetUtils.getLocalHost()
|
|
+ " using the dubbo version " + Version.getVersion() + ". Last error is: "
|
|
+ le.getMessage(), le);
|
|
}
|
|
return result;
|
|
} catch (RpcException e) {
|
|
if (e.isBiz()) { // biz exception.
|
|
throw e;
|
|
}
|
|
le = e;
|
|
} catch (Throwable e) {
|
|
le = new RpcException(e.getMessage(), e);
|
|
} finally {
|
|
providers.add(invoker.getUrl().getAddress());
|
|
}
|
|
}
|
|
throw new RpcException(le.getCode(), "Failed to invoke the method "
|
|
+ methodName + " in the service " + getInterface().getName()
|
|
+ ". Tried " + len + " times of the providers " + providers
|
|
+ " (" + providers.size() + "/" + copyInvokers.size()
|
|
+ ") from the registry " + directory.getUrl().getAddress()
|
|
+ " on the consumer " + NetUtils.getLocalHost() + " using the dubbo version "
|
|
+ Version.getVersion() + ". Last error is: "
|
|
+ le.getMessage(), le.getCause() != null ? le.getCause() : le);
|
|
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
|
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|
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<h3 id="Failfast-Cluster"><a href="#Failfast-Cluster" class="headerlink" title="Failfast Cluster"></a>Failfast Cluster</h3><p>快速失败，只发起一次调用，失败立即报错。通常用于非幂等性的写操作，比如新增记录。</p>
|
|
<h3 id="Failsafe-Cluster"><a href="#Failsafe-Cluster" class="headerlink" title="Failsafe Cluster"></a>Failsafe Cluster</h3><p>失败安全，出现异常时，直接忽略。通常用于写入审计日志等操作。</p>
|
|
<h3 id="Failback-Cluster"><a href="#Failback-Cluster" class="headerlink" title="Failback Cluster"></a>Failback Cluster</h3><p>失败自动恢复，后台记录失败请求，定时重发。通常用于消息通知操作。</p>
|
|
<h3 id="Forking-Cluster"><a href="#Forking-Cluster" class="headerlink" title="Forking Cluster"></a>Forking Cluster</h3><p>并行调用多个服务器，只要一个成功即返回。通常用于实时性要求较高的读操作，但需要浪费更多服务资源。可通过 forks=”2” 来设置最大并行数。</p>
|
|
<h3 id="Broadcast-Cluster"><a href="#Broadcast-Cluster" class="headerlink" title="Broadcast Cluster"></a>Broadcast Cluster</h3><p>广播调用所有提供者，逐个调用，任意一台报错则报错 2。通常用于通知所有提供者更新缓存或日志等本地资源信息。</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>Given a singly linked list, determine if it is a palindrome.<br>给定一个单向链表，判断是否是回文链表</p>
|
|
<h3 id="例一-Example-1"><a href="#例一-Example-1" class="headerlink" title="例一 Example 1:"></a>例一 Example 1:</h3><p>Input: 1->2<br>Output: false</p>
|
|
<h3 id="例二-Example-2"><a href="#例二-Example-2" class="headerlink" title="例二 Example 2:"></a>例二 Example 2:</h3><p>Input: 1->2->2->1<br>Output: true</p>
|
|
<h3 id="挑战下自己"><a href="#挑战下自己" class="headerlink" title="挑战下自己"></a>挑战下自己</h3><p>Follow up:<br>Could you do it in O(n) time and O(1) space?</p>
|
|
<h2 id="简要分析"><a href="#简要分析" class="headerlink" title="简要分析"></a>简要分析</h2><p>首先这是个单向链表，如果是双向的就可以一个从头到尾，一个从尾到头，显然那样就没啥意思了，然后想过要不找到中点，然后用一个栈，把前一半塞进栈里，但是这种其实也比较麻烦，比如长度是奇偶数，然后如何找到中点，这倒是可以借助于双指针，还是比较麻烦，再想一想，回文链表，就跟最开始的一样，链表只有单向的，我用个栈不就可以逆向了么，先把链表整个塞进栈里，然后在一个个 pop 出来跟链表从头开始比较，全对上了就是回文了</p>
|
|
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
|
|
* Definition for singly-linked list.
|
|
* public class ListNode {
|
|
* int val;
|
|
* ListNode next;
|
|
* ListNode() {}
|
|
* ListNode(int val) { this.val = val; }
|
|
* ListNode(int val, ListNode next) { this.val = val; this.next = next; }
|
|
* }
|
|
*/</span>
|
|
<span class="token keyword">class</span> <span class="token class-name">Solution</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">isPalindrome</span><span class="token punctuation">(</span><span class="token class-name">ListNode</span> head<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">if</span> <span class="token punctuation">(</span>head <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token class-name">ListNode</span> tail <span class="token operator">=</span> head<span class="token punctuation">;</span>
|
|
<span class="token class-name">LinkedList</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Integer</span><span class="token punctuation">></span></span> stack <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedList</span><span class="token generics"><span class="token punctuation"><</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token comment">// 这里就是一个循环，将所有元素依次压入栈</span>
|
|
<span class="token keyword">while</span> <span class="token punctuation">(</span>tail <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
stack<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>tail<span class="token punctuation">.</span>val<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
tail <span class="token operator">=</span> tail<span class="token punctuation">.</span>next<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token comment">// 在逐个 pop 出来，其实这个出来的顺序就等于链表从尾到头遍历，同时跟链表从头到尾遍历进行逐对对比</span>
|
|
<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span>stack<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">if</span> <span class="token punctuation">(</span>stack<span class="token punctuation">.</span><span class="token function">peekFirst</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> head<span class="token punctuation">.</span>val<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
stack<span class="token punctuation">.</span><span class="token function">pollFirst</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
head <span class="token operator">=</span> head<span class="token punctuation">.</span>next<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<span id="/2020/11/08/%E8%81%8A%E8%81%8A-Java-%E7%9A%84%E7%B1%BB%E5%8A%A0%E8%BD%BD%E6%9C%BA%E5%88%B6/" class="post-meta-item leancloud_visitors" data-flag-title="聊聊 Java 的类加载机制一" title="Views">
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<p>一说到这个主题，想到的应该是双亲委派模型，不过讲的包括但不限于这个，主要内容是参考深入理解 Java 虚拟机书中的介绍，<br>一个类型的生命周期包含了七个阶段，加载，验证，准备，解析，初始化，使用，卸载。</p>
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<ul>
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<li><h2 id="加载"><a href="#加载" class="headerlink" title="加载"></a>加载</h2></li>
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</ul>
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<ol>
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<li>通过一个类的全限定名来获取定义此类的二进制字节流</li>
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<li>将这个字节流代表的静态存储结构转化为方法区的运行时数据结构</li>
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<li>在内存中生成了一个代表这个类的 java.lang.Class 对象，作为方法区这个类的各种数据的访问入口</li>
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</ol>
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<li><h2 id="验证"><a href="#验证" class="headerlink" title="验证"></a>验证</h2></li>
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<ol>
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<li>文件格式验证</li>
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<li>元数据验证</li>
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<li>字节码验证</li>
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<li>符号引用验证</li>
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</ol>
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<ul>
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<li><h2 id="准备"><a href="#准备" class="headerlink" title="准备"></a>准备</h2><p>准备阶段是正式为类中定义的变量（即静态变量，被static修饰的变量）分配内存并设置类变量初始值的阶段</p>
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</li>
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<li><h2 id="解析"><a href="#解析" class="headerlink" title="解析"></a>解析</h2><p>解析阶段是 Java 虚拟机将常量池内的符号引用替换为直接引用的过程</p>
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</li>
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<p>以上<a href="##%E9%93%BE%E6%8E%A5">验证</a>、<a href="##%E5%87%86%E5%A4%87">准备</a>、<a href="##%E8%A7%A3%E6%9E%90">解析</a> 三个阶段又合称为链接阶段，链接阶段要做的是将加载到JVM中的二进制字节流的类数据信息合并到JVM的运行时状态中。</p>
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<li><h2 id="初始化"><a href="#初始化" class="headerlink" title="初始化"></a>初始化</h2>类的初始化阶段是类加载过程的最后一个步骤，也是除了自定义类加载器之外将主动权交给了应用程序，其实就是执行类构造器<clinit>()方法的过程，<clinit>()并不是我们在 Java 代码中直接编写的方法，它是 Javac编译器的自动生成物，<clinit>()方法是由编译器自动收集类中的所有类变量的复制动作和静态句块(static{}块)中的语句合并产生的，编译器收集的顺序是由语句在原文件中出现的顺序决定的，静态语句块中只能访问定义在静态语句块之前的变量，定义在它之后的变量，在前面的静态语句块可以复制，但是不能访问，同时还要保证父类的执行先于子类，然后保证多线程下的并发问题</li>
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</ul>
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<p>最终，方法区会存储当前类类信息，包括类的静态变量、类初始化代码（定义静态变量时的赋值语句 和 静态初始化代码块）、实例变量定义、实例初始化代码（定义实例变量时的赋值语句实例代码块和构造方法）和实例方法，还有父类的类信息引用。</p>
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<a 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/" class="post-title-link" itemprop="url">Apollo 的 value 注解是怎么自动更新的</a>
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<a href="/categories/Java/Apollo/value/" itemprop="url" rel="index"><span itemprop="name">value</span></a>
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<span id="/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/" class="post-meta-item leancloud_visitors" data-flag-title="Apollo 的 value 注解是怎么自动更新的" title="Views">
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<p>在前司和目前公司，用的配置中心都是使用的 Apollo，经过了业界验证，比较强大的配置管理系统，特别是在0.10 后开始支持对使用 value 注解的配置值进行自动更新，今天刚好有个同学问到我，就顺便写篇文章记录下，其实也是借助于 spring 强大的 bean 生命周期管理，可以实现BeanPostProcessor接口，使用postProcessBeforeInitialization方法，来对bean 内部的属性和方法进行判断，是否有 value 注解，如果有就是将它注册到一个 map 中，可以看到这个方法<code>com.ctrip.framework.apollo.spring.annotation.SpringValueProcessor#processField</code></p>
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<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
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<span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">processField</span><span class="token punctuation">(</span><span class="token class-name">Object</span> bean<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">,</span> <span class="token class-name">Field</span> field<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// register @Value on field</span>
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<span class="token class-name">Value</span> value <span class="token operator">=</span> field<span class="token punctuation">.</span><span class="token function">getAnnotation</span><span class="token punctuation">(</span><span class="token class-name">Value</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>value <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token class-name">Set</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> keys <span class="token operator">=</span> placeholderHelper<span class="token punctuation">.</span><span class="token function">extractPlaceholderKeys</span><span class="token punctuation">(</span>value<span class="token punctuation">.</span><span class="token function">value</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>keys<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">String</span> key <span class="token operator">:</span> keys<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">SpringValue</span> springValue <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SpringValue</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> value<span class="token punctuation">.</span><span class="token function">value</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> bean<span class="token punctuation">,</span> beanName<span class="token punctuation">,</span> field<span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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springValueRegistry<span class="token punctuation">.</span><span class="token function">register</span><span class="token punctuation">(</span>beanFactory<span class="token punctuation">,</span> key<span class="token punctuation">,</span> springValue<span class="token punctuation">)</span><span class="token punctuation">;</span>
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logger<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Monitoring {}"</span><span class="token punctuation">,</span> springValue<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>然后我们看下这个<code>springValueRegistry</code>是啥玩意</p>
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<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">SpringValueRegistry</span> <span class="token punctuation">{</span>
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<span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token keyword">long</span> CLEAN_INTERVAL_IN_SECONDS <span class="token operator">=</span> <span class="token number">5</span><span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">BeanFactory</span><span class="token punctuation">,</span> <span class="token class-name">Multimap</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">SpringValue</span><span class="token punctuation">></span><span class="token punctuation">></span></span> registry <span class="token operator">=</span> <span class="token class-name">Maps</span><span class="token punctuation">.</span><span class="token function">newConcurrentMap</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">AtomicBoolean</span> initialized <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">AtomicBoolean</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Object</span> LOCK <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Object</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">register</span><span class="token punctuation">(</span><span class="token class-name">BeanFactory</span> beanFactory<span class="token punctuation">,</span> <span class="token class-name">String</span> key<span class="token punctuation">,</span> <span class="token class-name">SpringValue</span> springValue<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>registry<span class="token punctuation">.</span><span class="token function">containsKey</span><span class="token punctuation">(</span>beanFactory<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">synchronized</span> <span class="token punctuation">(</span>LOCK<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>registry<span class="token punctuation">.</span><span class="token function">containsKey</span><span class="token punctuation">(</span>beanFactory<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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registry<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>beanFactory<span class="token punctuation">,</span> <span class="token class-name">LinkedListMultimap</span><span class="token punctuation">.</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">SpringValue</span><span class="token punctuation">></span></span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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registry<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>beanFactory<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> springValue<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// lazy initialize</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>initialized<span class="token punctuation">.</span><span class="token function">compareAndSet</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token function">initialize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>这类其实就是个 map 来存放 springvalue，然后有<code>com.ctrip.framework.apollo.spring.property.AutoUpdateConfigChangeListener</code>来监听更新操作，当有变更时</p>
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<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">onChange</span><span class="token punctuation">(</span><span class="token class-name">ConfigChangeEvent</span> changeEvent<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">Set</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> keys <span class="token operator">=</span> changeEvent<span class="token punctuation">.</span><span class="token function">changedKeys</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">CollectionUtils</span><span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span>keys<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">String</span> key <span class="token operator">:</span> keys<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// 1. check whether the changed key is relevant</span>
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<span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">SpringValue</span><span class="token punctuation">></span></span> targetValues <span class="token operator">=</span> springValueRegistry<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>beanFactory<span class="token punctuation">,</span> key<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>targetValues <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">||</span> targetValues<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">continue</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// 2. check whether the value is really changed or not (since spring property sources have hierarchies)</span>
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<span class="token comment">// 这里其实有一点比较绕，是因为 Apollo 里的 namespace 划分，会出现 key 相同，但是 namespace 不同的情况，所以会有个优先级存在，所以需要去校验 environment 里面的是否已经更新，如果未更新则表示不需要更新</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">shouldTriggerAutoUpdate</span><span class="token punctuation">(</span>changeEvent<span class="token punctuation">,</span> key<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">continue</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// 3. update the value</span>
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<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">SpringValue</span> val <span class="token operator">:</span> targetValues<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token function">updateSpringValue</span><span class="token punctuation">(</span>val<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>其实原理很简单，就是得了解知道下</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>
|
|
<pre class="line-numbers language-none"><code class="language-none"> 3
|
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/ \
|
|
9 20
|
|
/ \
|
|
15 7<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
|
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<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><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 主体是个递归的应用</span>
|
|
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">maxDepth</span><span class="token punctuation">(</span><span class="token class-name">TreeNode</span> root<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
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<span class="token comment">// 节点的退出条件之一</span>
|
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<span class="token keyword">if</span> <span class="token punctuation">(</span>root <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
|
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<span class="token punctuation">}</span>
|
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<span class="token keyword">int</span> left <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
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<span class="token keyword">int</span> right <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
|
|
<span class="token comment">// 存在左子树，就递归左子树</span>
|
|
<span class="token keyword">if</span> <span class="token punctuation">(</span>root<span class="token punctuation">.</span>left <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
left <span class="token operator">=</span> <span class="token function">maxDepth</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span>left<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
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<span class="token comment">// 存在右子树，就递归右子树</span>
|
|
<span class="token keyword">if</span> <span class="token punctuation">(</span>root<span class="token punctuation">.</span>right <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
right <span class="token operator">=</span> <span class="token function">maxDepth</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span>right<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token comment">// 前面返回后，左右取大者</span>
|
|
<span class="token keyword">return</span> <span class="token class-name">Math</span><span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span>left <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">,</span> right <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
|
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<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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class="tag-list-item"><a class="tag-list-link" href="/tags/Adaptive/" rel="tag">Adaptive</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Apollo/" rel="tag">Apollo</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Binary-Tree/" rel="tag">Binary Tree</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Broker/" rel="tag">Broker</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/C/" rel="tag">C</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/C/" rel="tag">C++</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/CachedThreadPool/" rel="tag">CachedThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Comparator/" rel="tag">Comparator</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/DFS/" rel="tag">DFS</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/DP/" rel="tag">DP</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/DefaultMQPushConsumer/" rel="tag">DefaultMQPushConsumer</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Design-Patterns/" rel="tag">Design Patterns</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Distributed-Lock/" rel="tag">Distributed Lock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Docker/" rel="tag">Docker</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Dockerfile/" rel="tag">Dockerfile</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Dubbo/" rel="tag">Dubbo</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/EagerThreadPool/" rel="tag">EagerThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Filter/" rel="tag">Filter</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/FixedThreadPool/" rel="tag">FixedThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/G1/" rel="tag">G1</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/GC/" rel="tag">GC</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Garbage-First-Collector/" rel="tag">Garbage-First Collector</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Gogs/" rel="tag">Gogs</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Homebrew/" rel="tag">Homebrew</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Inorder-Traversal/" rel="tag">Inorder Traversal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Interceptor/" rel="tag">Interceptor</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/JMap/" rel="tag">JMap</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/JPS/" rel="tag">JPS</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/JStack/" rel="tag">JStack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/JVM/" rel="tag">JVM</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Java/" rel="tag">Java</a><span class="tag-list-count">14</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/LimitedThreadPool/" rel="tag">LimitedThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Linked-List/" rel="tag">Linked List</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/MQ/" rel="tag">MQ</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Mac/" rel="tag">Mac</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Maven/" rel="tag">Maven</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Mybatis/" rel="tag">Mybatis</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Mysql/" rel="tag">Mysql</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/NameServer/" rel="tag">NameServer</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/PHP/" rel="tag">PHP</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Preorder-Traversal/" rel="tag">Preorder Traversal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/RPC/" rel="tag">RPC</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Redis/" rel="tag">Redis</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/RocketMQ/" rel="tag">RocketMQ</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Rotate-Image/" rel="tag">Rotate Image</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Rust/" rel="tag">Rust</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/SPI/" rel="tag">SPI</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Servlet/" rel="tag">Servlet</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Singleton/" rel="tag">Singleton</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Spring/" rel="tag">Spring</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Sql%E6%B3%A8%E5%85%A5/" rel="tag">Sql注入</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Stream/" rel="tag">Stream</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Thread-dump/" rel="tag">Thread dump</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ThreadPool/" rel="tag">ThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Tomcat/" rel="tag">Tomcat</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Web/" rel="tag">Web</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Webhook/" rel="tag">Webhook</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/aqs/" rel="tag">aqs</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/await/" rel="tag">await</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/bloom-filter/" rel="tag">bloom filter</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/c/" rel="tag">c++</a><span class="tag-list-count">14</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cgroup/" rel="tag">cgroup</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cluster/" rel="tag">cluster</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/condition/" rel="tag">condition</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/docker/" rel="tag">docker</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/echo/" rel="tag">echo</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/environment/" rel="tag">environment</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gap-lock/" rel="tag">gap lock</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gc/" rel="tag">gc</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/grep/" rel="tag">grep</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/hadoop/" rel="tag">hadoop</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/icu4c/" rel="tag">icu4c</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/im/" rel="tag">im</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/is-not-null/" rel="tag">is not null</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/is-null/" rel="tag">is null</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/j-u-c/" rel="tag">j.u.c</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/java/" rel="tag">java</a><span class="tag-list-count">14</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/jvm/" rel="tag">jvm</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/leetcode/" rel="tag">leetcode</a><span class="tag-list-count">23</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/leetcode-155/" rel="tag">leetcode 155</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/linked-list/" rel="tag">linked list</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/linux/" rel="tag">linux</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/lock/" rel="tag">lock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mfc/" rel="tag">mfc</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/min-stack/" rel="tag">min stack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mq/" rel="tag">mq</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mvcc/" rel="tag">mvcc</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mysql/" rel="tag">mysql</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/namespace/" rel="tag">namespace</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/next-key-lock/" rel="tag">next-key lock</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nginx/" rel="tag">nginx</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nullsfirst/" rel="tag">nullsfirst</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/openresty/" rel="tag">openresty</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/php/" rel="tag">php</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/procedure/" rel="tag">procedure</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/python/" rel="tag">python</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/read-view/" rel="tag">read view</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/redis/" rel="tag">redis</a><span class="tag-list-count">8</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/signal/" rel="tag">signal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/sort/" rel="tag">sort</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/spark/" rel="tag">spark</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/stack/" rel="tag">stack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/string/" rel="tag">string</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/swoole/" rel="tag">swoole</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/top/" rel="tag">top</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/uname/" rel="tag">uname</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/unlock/" rel="tag">unlock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/value/" rel="tag">value</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/websocket/" rel="tag">websocket</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/zsh/" rel="tag">zsh</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%89%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">三阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%8D%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/" rel="tag">不可变引用</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%A4%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">两阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%B1%B1%E8%B7%AF/" rel="tag">中山路</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%BA%8F/" rel="tag">中序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E9%97%B4%E4%BB%B6/" rel="tag">中间件</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%8C%E5%8F%89%E6%A0%91/" rel="tag">二叉树</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%92%E6%96%A5%E9%94%81/" rel="tag">互斥锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BF%AE%E7%94%B5%E8%84%91%E7%9A%84/" rel="tag">修电脑的</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%81%A5%E5%BA%B7%E7%A0%81/" rel="tag">健康码</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4/" rel="tag">公交</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4%E8%BD%A6/" rel="tag">公交车</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E5%88%86%E5%B8%83/" rel="tag">内存分布</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%8F%E8%82%A5/" rel="tag">减肥</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E4%BA%8B%E5%8A%A1/" rel="tag">分布式事务</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81/" rel="tag">分布式锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8A%E5%B3%B0%E5%A1%AB%E8%B0%B7/" rel="tag">削峰填谷</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8D%E5%BA%8F/" rel="tag">前序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A0%E5%A1%9E/" rel="tag">加塞</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%95%E4%BE%8B/" rel="tag">单例</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%9A%E5%AE%A2%EF%BC%8C%E6%96%87%E7%AB%A0/" rel="tag">博客，文章</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8E%A6%E9%97%A8/" rel="tag">厦门</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%91%E8%A1%8C%E7%89%88/" rel="tag">发行版</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%A3%E7%BD%A9/" rel="tag">口罩</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/" rel="tag">可变引用</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%90%90%E6%A7%BD/" rel="tag">吐槽</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6/" rel="tag">垃圾回收</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9F%BA%E7%A1%80%E8%AE%BE%E6%96%BD/" rel="tag">基础设施</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%B9%E9%94%99%E6%9C%BA%E5%88%B6/" rel="tag">容错机制</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AF%84%E7%94%9F%E8%99%AB/" rel="tag">寄生虫</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B0%8F%E6%8A%80%E5%B7%A7/" rel="tag">小技巧</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B1%80%E5%8F%A3%E8%A1%97/" rel="tag">局口街</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B8%83%E9%9A%86%E8%BF%87%E6%BB%A4%E5%99%A8/" rel="tag">布隆过滤器</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B2%E6%B4%BB/" rel="tag">干活</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" rel="tag">年中总结</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/" rel="tag">年终总结</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B6%E5%8F%91/" rel="tag">并发</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B8%E7%A6%8F%E4%BA%86%E5%90%97/" rel="tag">幸福了吗</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%BB%E8%AF%BB/" rel="tag">幻读</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%BC%80%E8%BD%A6/" rel="tag">开车</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%BD%B1%E8%AF%84/" rel="tag">影评</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%89%80%E6%9C%89%E6%9D%83/" rel="tag">所有权</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%89%93%E5%8D%A1/" rel="tag">打卡</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%8B%96%E6%9B%B4/" rel="tag">拖更</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%8E%92%E5%BA%8F/" rel="tag">排序</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/" rel="tag">数据结构</a><span class="tag-list-count">11</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%96%B0%E8%AF%AD%E8%A8%80/" rel="tag">新语言</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%97%85%E6%B8%B8/" rel="tag">旅游</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%9B%BE%E5%8E%9D%E5%9E%B5/" rel="tag">曾厝垵</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%9C%80%E5%B0%8F%E6%A0%88/" rel="tag">最小栈</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%9D%80%E4%BA%BA%E8%AF%9B%E5%BF%83/" rel="tag">杀人诛心</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%9D%AD%E5%B7%9E/" rel="tag">杭州</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%A0%87%E8%AE%B0%E6%95%B4%E7%90%86/" rel="tag">标记整理</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%A4%8D%E7%89%A9%E5%9B%AD/" rel="tag">植物园</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%B2%99%E8%8C%B6%E9%9D%A2/" rel="tag">沙茶面</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%B3%A8%E8%A7%A3/" rel="tag">注解</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%B5%B7%E8%9B%8E%E7%85%8E/" rel="tag">海蛎煎</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97/" rel="tag">消息队列</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%BA%90%E7%A0%81/" rel="tag">源码</a><span class="tag-list-count">11</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%BA%90%E7%A0%81%E8%A7%A3%E6%9E%90/" rel="tag">源码解析</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%94%9F%E6%B4%BB/" rel="tag">生活</a><span class="tag-list-count">17</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%96%AB%E6%83%85/" rel="tag">疫情</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%9F%A9%E9%98%B5/" rel="tag">矩阵</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%B3%9F%E5%BF%83%E4%BA%8B/" rel="tag">糟心事</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%B4%A2%E5%BC%95/" rel="tag">索引</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BA%BF%E7%A8%8B%E6%B1%A0/" rel="tag">线程池</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BC%93%E5%AD%98/" rel="tag">缓存</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BC%93%E5%AD%98%E5%87%BB%E7%A9%BF/" rel="tag">缓存击穿</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BC%93%E5%AD%98%E7%A9%BF%E9%80%8F/" rel="tag">缓存穿透</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BC%93%E5%AD%98%E9%9B%AA%E5%B4%A9/" rel="tag">缓存雪崩</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BE%8E%E5%9B%BD/" 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%80%81%E7%94%B5%E8%84%91/" rel="tag">老电脑</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%A3%85%E7%94%B5%E8%84%91/" rel="tag">装电脑</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%A7%84%E5%88%99/" rel="tag">规则</a><span class="tag-list-count">3</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%E4%B9%A6/" rel="tag">读书</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">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%B6%B3%E7%90%83/" rel="tag">足球</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%B7%AF%E6%94%BF%E8%A7%84%E5%88%92/" rel="tag">路政规划</a><span class="tag-list-count">2</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">10</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E9%A9%AC%E6%88%8F%E5%9B%A2/" rel="tag">马戏团</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E9%AB%98%E9%80%9F/" rel="tag">高速</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E9%BC%93%E6%B5%AA%E5%B1%BF/" rel="tag">鼓浪屿</a><span class="tag-list-count">1</span></li></ul>
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</canvas>
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<div class="links-of-blogroll motion-element">
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<div class="links-of-blogroll-title"><i class="fa fa-link fa-fw"></i>
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Links
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<a href="https://covermusic.cn/" title="https://covermusic.cn" rel="noopener" target="_blank">69伙伴</a>
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<footer class="footer">
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<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-icon">
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<i class="fa fa-user"></i>
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</span>
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<span class="site-uv" title="Total Visitors">
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<span id="busuanzi_value_site_uv"></span>
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<span class="post-meta-item" id="busuanzi_container_site_pv" style="display: none;">
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<i class="fa fa-eye"></i>
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<span id="busuanzi_value_site_pv"></span>
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<script>
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(function() {
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function leancloudSelector(url) {
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url = encodeURI(url);
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return document.getElementById(url).querySelector('.leancloud-visitors-count');
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}
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function addCount(Counter) {
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var visitors = document.querySelector('.leancloud_visitors');
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var url = decodeURI(visitors.id);
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var title = visitors.dataset.flagTitle;
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Counter('get', '/classes/Counter?where=' + encodeURIComponent(JSON.stringify({ url })))
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.then(response => response.json())
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.then(({ results }) => {
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if (results.length > 0) {
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var counter = results[0];
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leancloudSelector(url).innerText = counter.time + 1;
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Counter('put', '/classes/Counter/' + counter.objectId, { time: { '__op': 'Increment', 'amount': 1 } })
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.catch(error => {
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console.error('Failed to save visitor count', error);
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});
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} else {
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leancloudSelector(url).innerText = 'Counter not initialized! More info at console err msg.';
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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`.');
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}
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})
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.catch(error => {
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console.error('LeanCloud Counter Error', error);
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});
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}
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function showTime(Counter) {
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var visitors = document.querySelectorAll('.leancloud_visitors');
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var entries = [...visitors].map(element => {
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return decodeURI(element.id);
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});
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Counter('get', '/classes/Counter?where=' + encodeURIComponent(JSON.stringify({ url: { '$in': entries } })))
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.then(response => response.json())
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.then(({ results }) => {
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for (let url of entries) {
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let target = results.find(item => item.url === url);
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leancloudSelector(url).innerText = target ? target.time : 0;
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}
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})
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.catch(error => {
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console.error('LeanCloud Counter Error', error);
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});
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}
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let { app_id, app_key, server_url } = {"enable":true,"app_id":"ysza182Vghlqjdt7QiwGLLJy-gzGzoHsz","app_key":"s9GDqbn7gnGGkusf66YRVccw","server_url":"https://leancloud.cn","security":true};
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function fetchData(api_server) {
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var Counter = (method, url, data) => {
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return fetch(`${api_server}/1.1${url}`, {
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method,
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headers: {
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'X-LC-Id' : app_id,
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'X-LC-Key' : app_key,
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'Content-Type': 'application/json',
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},
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body: JSON.stringify(data)
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});
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};
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if (CONFIG.page.isPost) {
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if (CONFIG.hostname !== location.hostname) return;
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addCount(Counter);
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} else if (document.querySelectorAll('.post-title-link').length >= 1) {
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showTime(Counter);
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}
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}
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let api_server = app_id.slice(-9) !== '-MdYXbMMI' ? server_url : `https://${app_id.slice(0, 8).toLowerCase()}.api.lncldglobal.com`;
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if (api_server) {
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fetchData(api_server);
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} else {
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fetch('https://app-router.leancloud.cn/2/route?appId=' + app_id)
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.then(response => response.json())
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.then(({ api_server }) => {
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fetchData('https://' + api_server);
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});
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}
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})();
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for (i=0;i<x.length;i++){
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if(x[i].rel.toLowerCase() == 'canonical' && x[i].href){
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canonicalURL=x[i].href;
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}
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}
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}
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//Get protocol
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if (!canonicalURL){
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curProtocol = window.location.protocol.split(':')[0];
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}
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else{
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curProtocol = canonicalURL.split(':')[0];
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}
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|
//Get current URL if the canonical URL does not exist
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|
if (!canonicalURL) canonicalURL = window.location.href;
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|
//Assign script content. Replace current URL with the canonical URL
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|
!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);})();
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</script>
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<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>
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|
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</body>
|
|
</html>
|