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311 lines
143 KiB
311 lines
143 KiB
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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/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/dubbo/" rel="tag">dubbo</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">2</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/git/" rel="tag">git</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">33</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">40</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">6</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">3</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">11</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/scp/" rel="tag">scp</a><span class="tag-list-count">1</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/ssh/" rel="tag">ssh</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/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/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/utf8/" rel="tag">utf8</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4/" rel="tag">utf8mb4</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-0900-ai-ci/" rel="tag">utf8mb4_0900_ai_ci</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-general-ci/" rel="tag">utf8mb4_general_ci</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-unicode-ci/" rel="tag">utf8mb4_unicode_ci</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/zookeeper/" rel="tag">zookeeper</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">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%9C%E4%BA%AC%E5%A5%A5%E8%BF%90%E4%BC%9A/" rel="tag">东京奥运会</a><span class="tag-list-count">2</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%B8%BE%E9%87%8D/" rel="tag">举重</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B9%92%E4%B9%93%E7%90%83/" rel="tag">乒乓球</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%8B%E5%8A%A1/" rel="tag">事务</a><span class="tag-list-count">1</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%BB%A3%E7%A0%81%E9%A2%98%E8%A7%A3/" rel="tag">代码题解</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%8F%E5%90%91%E9%94%81/" rel="tag">偏向锁</a><span class="tag-list-count">2</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">3</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">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/" rel="tag">内存泄漏</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%86%E5%A4%87/" rel="tag">准备</a><span class="tag-list-count">1</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%88%87%E7%89%87/" rel="tag">切片</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%9D%E5%A7%8B%E5%8C%96/" rel="tag">初始化</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%8A%A0%E8%BD%BD/" rel="tag">加载</a><span class="tag-list-count">1</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 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href="/tags/%E5%9B%A4%E7%89%A9%E8%B5%84/" rel="tag">囤物资</a><span class="tag-list-count">1</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%A4%A7%E6%89%AB%E9%99%A4/" rel="tag">大扫除</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AD%97%E7%AC%A6%E9%9B%86/" rel="tag">字符集</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%89%E5%85%A8/" rel="tag">安全</a><span class="tag-list-count">1</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%84%E5%87%BB/" rel="tag">射击</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">5</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">2</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">3</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%BA%94%E7%94%A8/" rel="tag">应用</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 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itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><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></h2><div class="post-meta-container"><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">发表于</span> <time title="创建时间：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"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</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/Spring/" itemprop="url" rel="index"><span itemprop="name">Spring</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 itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Spring/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</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="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</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="/2020/10/03/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></div></div></header><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 target="_blank" rel="noopener" href="https://github.com/mybatis/mybatis-3/blob/master/src/main/java/org/apache/ibatis/executor/BaseExecutor.java#L65">BaseExecutor</a> 中的 <a target="_blank" rel="noopener" href="https://github.com/mybatis/mybatis-3/blob/master/src/main/java/org/apache/ibatis/cache/impl/PerpetualCache.java#L27">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><pre class="line-numbers language-Java" data-language="Java"><code class="language-Java">public class PerpetualCache implements Cache {
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private final String id;
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private final Map<Object, Object> cache = new HashMap<>();
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public PerpetualCache(String id) {
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this.id = id;
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}
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@Override
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public String getId() {
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return id;
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}
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@Override
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public int getSize() {
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return cache.size();
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}
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@Override
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public void putObject(Object key, Object value) {
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cache.put(key, value);
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}
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@Override
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public Object getObject(Object key) {
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return cache.get(key);
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}
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@Override
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public Object removeObject(Object key) {
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return cache.remove(key);
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}
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@Override
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public void clear() {
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cache.clear();
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}
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@Override
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public boolean equals(Object o) {
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if (getId() == null) {
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throw new CacheException("Cache instances require an ID.");
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}
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if (this == o) {
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return true;
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}
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if (!(o instanceof Cache)) {
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return false;
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}
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Cache otherCache = (Cache) o;
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return getId().equals(otherCache.getId());
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}
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@Override
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public int hashCode() {
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if (getId() == null) {
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throw new CacheException("Cache instances require an ID.");
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}
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return getId().hashCode();
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}
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}<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></code></pre><p>可以看一下BaseExecutor 的构造函数</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">protected</span> <span class="token class-name">BaseExecutor</span><span class="token punctuation">(</span><span class="token class-name">Configuration</span> configuration<span class="token punctuation">,</span> <span class="token class-name">Transaction</span> transaction<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>transaction <span class="token operator">=</span> transaction<span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>deferredLoads <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ConcurrentLinkedQueue</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>
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<span class="token keyword">this</span><span class="token punctuation">.</span>localCache <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">PerpetualCache</span><span class="token punctuation">(</span><span class="token string">"LocalCache"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>localOutputParameterCache <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">PerpetualCache</span><span class="token punctuation">(</span><span class="token string">"LocalOutputParameterCache"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>closed <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>configuration <span class="token operator">=</span> configuration<span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>wrapper <span class="token operator">=</span> <span class="token keyword">this</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></code></pre><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><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 generics"><span class="token punctuation"><</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">query</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">{</span>
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<span class="token class-name">BoundSql</span> boundSql <span class="token operator">=</span> ms<span class="token punctuation">.</span><span class="token function">getBoundSql</span><span class="token punctuation">(</span>parameter<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">CacheKey</span> key <span class="token operator">=</span> <span class="token function">createCacheKey</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> <span class="token function">query</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> key<span class="token punctuation">,</span> boundSql<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></code></pre><p>可以看到首先是调用了 <a target="_blank" rel="noopener" href="https://github.com/mybatis/mybatis-3/blob/master/src/main/java/org/apache/ibatis/executor/BaseExecutor.java#L195">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><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 class-name">CacheKey</span> <span class="token function">createCacheKey</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameterObject<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">BoundSql</span> boundSql<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>closed<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">ExecutorException</span><span class="token punctuation">(</span><span class="token string">"Executor was closed."</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 class-name">CacheKey</span> cacheKey <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CacheKey</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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cacheKey<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span>ms<span class="token punctuation">.</span><span class="token function">getId</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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cacheKey<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span>rowBounds<span class="token punctuation">.</span><span class="token function">getOffset</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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cacheKey<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span>rowBounds<span class="token punctuation">.</span><span class="token function">getLimit</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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cacheKey<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span>boundSql<span class="token punctuation">.</span><span class="token function">getSql</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 class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">ParameterMapping</span><span class="token punctuation">></span></span> parameterMappings <span class="token operator">=</span> boundSql<span class="token punctuation">.</span><span class="token function">getParameterMappings</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">TypeHandlerRegistry</span> typeHandlerRegistry <span class="token operator">=</span> ms<span class="token punctuation">.</span><span class="token function">getConfiguration</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getTypeHandlerRegistry</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// mimic DefaultParameterHandler logic</span>
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<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">ParameterMapping</span> parameterMapping <span class="token operator">:</span> parameterMappings<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>parameterMapping<span class="token punctuation">.</span><span class="token function">getMode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token class-name">ParameterMode</span><span class="token punctuation">.</span><span class="token constant">OUT</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">Object</span> value<span class="token punctuation">;</span>
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|
<span class="token class-name">String</span> propertyName <span class="token operator">=</span> parameterMapping<span class="token punctuation">.</span><span class="token function">getProperty</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>boundSql<span class="token punctuation">.</span><span class="token function">hasAdditionalParameter</span><span class="token punctuation">(</span>propertyName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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value <span class="token operator">=</span> boundSql<span class="token punctuation">.</span><span class="token function">getAdditionalParameter</span><span class="token punctuation">(</span>propertyName<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>parameterObject <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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value <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>typeHandlerRegistry<span class="token punctuation">.</span><span class="token function">hasTypeHandler</span><span class="token punctuation">(</span>parameterObject<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</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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value <span class="token operator">=</span> parameterObject<span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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<span class="token class-name">MetaObject</span> metaObject <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">newMetaObject</span><span class="token punctuation">(</span>parameterObject<span class="token punctuation">)</span><span class="token punctuation">;</span>
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value <span class="token operator">=</span> metaObject<span class="token punctuation">.</span><span class="token function">getValue</span><span class="token punctuation">(</span>propertyName<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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cacheKey<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span>value<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 keyword">if</span> <span class="token punctuation">(</span>configuration<span class="token punctuation">.</span><span class="token function">getEnvironment</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <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 comment">// issue #176</span>
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cacheKey<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span>configuration<span class="token punctuation">.</span><span class="token function">getEnvironment</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getId</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 keyword">return</span> cacheKey<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<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></code></pre><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><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">update</span><span class="token punctuation">(</span><span class="token class-name">Object</span> object<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">int</span> baseHashCode <span class="token operator">=</span> object <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">?</span> <span class="token number">1</span> <span class="token operator">:</span> <span class="token class-name">ArrayUtil</span><span class="token punctuation">.</span><span class="token function">hashCode</span><span class="token punctuation">(</span>object<span class="token punctuation">)</span><span class="token punctuation">;</span>
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count<span class="token operator">++</span><span class="token punctuation">;</span>
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checksum <span class="token operator">+=</span> baseHashCode<span class="token punctuation">;</span>
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baseHashCode <span class="token operator">*=</span> count<span class="token punctuation">;</span>
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hashcode <span class="token operator">=</span> multiplier <span class="token operator">*</span> hashcode <span class="token operator">+</span> baseHashCode<span class="token punctuation">;</span>
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updateList<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>object<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></code></pre><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><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 generics"><span class="token punctuation"><</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">query</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">,</span> <span class="token class-name">CacheKey</span> key<span class="token punctuation">,</span> <span class="token class-name">BoundSql</span> boundSql<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">{</span>
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<span class="token class-name">ErrorContext</span><span class="token punctuation">.</span><span class="token function">instance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">resource</span><span class="token punctuation">(</span>ms<span class="token punctuation">.</span><span class="token function">getResource</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">activity</span><span class="token punctuation">(</span><span class="token string">"executing a query"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">object</span><span class="token punctuation">(</span>ms<span class="token punctuation">.</span><span class="token function">getId</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>closed<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">ExecutorException</span><span class="token punctuation">(</span><span class="token string">"Executor was closed."</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 keyword">if</span> <span class="token punctuation">(</span>queryStack <span class="token operator">==</span> <span class="token number">0</span> <span class="token operator">&&</span> ms<span class="token punctuation">.</span><span class="token function">isFlushCacheRequired</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 function">clearLocalCache</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 class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">E</span><span class="token punctuation">></span></span> list<span class="token punctuation">;</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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queryStack<span class="token operator">++</span><span class="token punctuation">;</span>
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list <span class="token operator">=</span> resultHandler <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">?</span> <span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">E</span><span class="token punctuation">></span></span><span class="token punctuation">)</span> localCache<span class="token punctuation">.</span><span class="token function">getObject</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span> <span class="token operator">:</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>list <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 function">handleLocallyCachedOutputParameters</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> key<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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list <span class="token operator">=</span> <span class="token function">queryFromDatabase</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> key<span class="token punctuation">,</span> boundSql<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 class="token keyword">finally</span> <span class="token punctuation">{</span>
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queryStack<span class="token operator">--</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>queryStack <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <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">DeferredLoad</span> deferredLoad <span class="token operator">:</span> deferredLoads<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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deferredLoad<span class="token punctuation">.</span><span class="token function">load</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 comment">// issue #601</span>
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deferredLoads<span class="token punctuation">.</span><span class="token function">clear</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>configuration<span class="token punctuation">.</span><span class="token function">getLocalCacheScope</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token class-name">LocalCacheScope</span><span class="token punctuation">.</span><span class="token constant">STATEMENT</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// issue #482</span>
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<span class="token function">clearLocalCache</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 keyword">return</span> list<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></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><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><pre class="line-numbers language-markup" data-language="markup"><code class="language-markup"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>setting</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>cacheEnabled<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>true<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p>来开启，然后我们的查询就会走到</p><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">CachingExecutor</span> <span class="token keyword">implements</span> <span class="token class-name">Executor</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">Executor</span> delegate<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">TransactionalCacheManager</span> tcm <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TransactionalCacheManager</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></code></pre><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><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 generics"><span class="token punctuation"><</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">query</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameterObject<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">{</span>
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<span class="token class-name">BoundSql</span> boundSql <span class="token operator">=</span> ms<span class="token punctuation">.</span><span class="token function">getBoundSql</span><span class="token punctuation">(</span>parameterObject<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">CacheKey</span> key <span class="token operator">=</span> <span class="token function">createCacheKey</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameterObject<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> <span class="token function">query</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameterObject<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> key<span class="token punctuation">,</span> boundSql<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 annotation punctuation">@Override</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">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">query</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameterObject<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">,</span> <span class="token class-name">CacheKey</span> key<span class="token punctuation">,</span> <span class="token class-name">BoundSql</span> boundSql<span class="token punctuation">)</span>
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<span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">{</span>
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<span class="token class-name">Cache</span> cache <span class="token operator">=</span> ms<span class="token punctuation">.</span><span class="token function">getCache</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>cache <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 function">flushCacheIfRequired</span><span class="token punctuation">(</span>ms<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>ms<span class="token punctuation">.</span><span class="token function">isUseCache</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&&</span> resultHandler <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 function">ensureNoOutParams</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token annotation punctuation">@SuppressWarnings</span><span class="token punctuation">(</span><span class="token string">"unchecked"</span><span class="token punctuation">)</span>
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<span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">E</span><span class="token punctuation">></span></span> list <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">E</span><span class="token punctuation">></span></span><span class="token punctuation">)</span> tcm<span class="token punctuation">.</span><span class="token function">getObject</span><span class="token punctuation">(</span>cache<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>list <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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list <span class="token operator">=</span> delegate<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameterObject<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> key<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
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tcm<span class="token punctuation">.</span><span class="token function">putObject</span><span class="token punctuation">(</span>cache<span class="token punctuation">,</span> key<span class="token punctuation">,</span> list<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// issue #578 and #116</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">return</span> list<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 keyword">return</span> delegate<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameterObject<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> key<span class="token punctuation">,</span> boundSql<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></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><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><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">TransactionalCacheManager</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">Cache</span><span class="token punctuation">,</span> <span class="token class-name">TransactionalCache</span><span class="token punctuation">></span></span> transactionalCaches <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">HashMap</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 aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre><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><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">TransactionalCache</span> <span class="token keyword">implements</span> <span class="token class-name">Cache</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 class-name">Log</span> log <span class="token operator">=</span> <span class="token class-name">LogFactory</span><span class="token punctuation">.</span><span class="token function">getLog</span><span class="token punctuation">(</span><span class="token class-name">TransactionalCache</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">private</span> <span class="token keyword">final</span> <span class="token class-name">Cache</span> delegate<span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">boolean</span> clearOnCommit<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">Object</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">></span></span> entriesToAddOnCommit<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">Set</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Object</span><span class="token punctuation">></span></span> entriesMissedInCache<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></code></pre><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><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">commit</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>clearOnCommit<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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delegate<span class="token punctuation">.</span><span class="token function">clear</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 function">flushPendingEntries</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">reset</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><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><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/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><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></h2><div class="post-meta-container"><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">发表于</span> <time title="创建时间：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"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</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="/2020/09/26/%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="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</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="/2020/09/26/%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></div></div></header><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></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><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/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><header class="post-header"><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></h2><div class="post-meta-container"><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">发表于</span> <time title="创建时间：2020-09-20 21:40:23 / 修改时间：21:45:17" itemprop="dateCreated datePublished" datetime="2020-09-20T21:40:23+08:00">2020-09-20</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">分类于</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> </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> </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> </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> </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="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</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="/2020/09/20/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></span></div></div></header><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><pre class="line-numbers language-none"><code class="language-none">Input: s = "abcabcbb"
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Output: 3
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Explanation: The answer is "abc", with the length of 3.<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre><h4 id="Example-2"><a href="#Example-2" class="headerlink" title="Example 2:"></a>Example 2:</h4><pre class="line-numbers language-none"><code class="language-none">Input: s = "bbbbb"
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Output: 1
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Explanation: The answer is "b", with the length of 1.<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre><h4 id="Example-3"><a href="#Example-3" class="headerlink" title="Example 3:"></a>Example 3:</h4><pre class="line-numbers language-none"><code class="language-none">Input: s = "pwwkew"
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Output: 3
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Explanation: The answer is "wke", with the length of 3.
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Notice that the answer must be a substring, "pwke" is a subsequence and not a substring.<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre><h4 id="Example-4"><a href="#Example-4" class="headerlink" title="Example 4:"></a>Example 4:</h4><pre class="line-numbers language-none"><code class="language-none">Input: s = ""
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Output: 0<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre><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><pre class="line-numbers language-Java" data-language="Java"><code class="language-Java">class Solution {
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Map<String, Integer> counter = new HashMap<>();
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public int lengthOfLongestSubstring(String s) {
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int length = s.length();
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// 当前的长度
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int subStringLength = 0;
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// 最长的长度
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int maxSubStringLength = 0;
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// 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
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int lastDuplicatePos = -1;
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for (int i = 0; i < length; i++) {
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// 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
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if (counter.get(String.valueOf(s.charAt(i))) != null && counter.get(String.valueOf(s.charAt(i))) > lastDuplicatePos) {
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// 记录重复位置
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lastDuplicatePos = counter.get(String.valueOf(s.charAt(i)));
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// 重置不重复子串的长度，减去重复起点
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subStringLength = i - counter.get(String.valueOf(s.charAt(i))) - 1;
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// 替换当前位置
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counter.replace(String.valueOf(s.charAt(i)), i);
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} else {
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// 如果不存在就直接 put
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counter.put(String.valueOf(s.charAt(i)), i);
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}
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// 长度累加
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subStringLength++;
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if (subStringLength > maxSubStringLength) {
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// 简单替换
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maxSubStringLength = subStringLength;
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}
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}
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return maxSubStringLength;
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}
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}<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></code></pre><p>注释应该写的比较清楚了。</p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><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/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><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><div class="post-meta-container"><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">发表于</span> <time title="创建时间：2020-09-13 23:37:21 / 修改时间：23:39:01" itemprop="dateCreated datePublished" datetime="2020-09-13T23:37:21+08:00">2020-09-13</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">分类于</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="/2020/09/13/%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-meta-item leancloud_visitors" data-flag-title="在老丈人家的小工记三" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</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="/2020/09/13/%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></a></span></div></div></header><div class="post-body" itemprop="articleBody"><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><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><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/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><header class="post-header"><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></h2><div class="post-meta-container"><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">发表于</span> <time title="创建时间：2020-09-06 23:14:50" itemprop="dateCreated datePublished" datetime="2020-09-06T23:14:50+08:00">2020-09-06</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">更新于</span> <time title="修改时间：2022-06-11 22:45:11" itemprop="dateModified" datetime="2022-06-11T22:45:11+08:00">2022-06-11</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">分类于</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/Spring/" itemprop="url" rel="index"><span itemprop="name">Spring</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> </span>， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><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/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a> </span></span><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="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</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="/2020/09/06/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></a></span></div></div></header><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://img.nicksxs.com/uPic/c84r0g.png"><br>前面说的是否 dynamic 就是在这里进行判断<br><img data-src="https://img.nicksxs.com/uPic/E0ODcp.png"></p><pre class="line-numbers language-Java" data-language="Java"><code class="language-Java">// org.apache.ibatis.scripting.xmltags.XMLScriptBuilder#parseScriptNode
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public SqlSource parseScriptNode() {
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MixedSqlNode rootSqlNode = parseDynamicTags(context);
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SqlSource sqlSource;
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if (isDynamic) {
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sqlSource = new DynamicSqlSource(configuration, rootSqlNode);
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} else {
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sqlSource = new RawSqlSource(configuration, rootSqlNode, parameterType);
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}
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return sqlSource;
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}
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// org.apache.ibatis.scripting.xmltags.XMLScriptBuilder#parseDynamicTags
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protected MixedSqlNode parseDynamicTags(XNode node) {
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List<SqlNode> contents = new ArrayList<>();
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NodeList children = node.getNode().getChildNodes();
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for (int i = 0; i < children.getLength(); i++) {
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XNode child = node.newXNode(children.item(i));
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if (child.getNode().getNodeType() == Node.CDATA_SECTION_NODE || child.getNode().getNodeType() == Node.TEXT_NODE) {
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String data = child.getStringBody("");
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TextSqlNode textSqlNode = new TextSqlNode(data);
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if (textSqlNode.isDynamic()) {
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contents.add(textSqlNode);
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isDynamic = true;
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} else {
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contents.add(new StaticTextSqlNode(data));
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}
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} else if (child.getNode().getNodeType() == Node.ELEMENT_NODE) { // issue #628
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String nodeName = child.getNode().getNodeName();
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NodeHandler handler = nodeHandlerMap.get(nodeName);
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if (handler == null) {
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throw new BuilderException("Unknown element <" + nodeName + "> in SQL statement.");
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}
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handler.handleNode(child, contents);
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isDynamic = true;
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}
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}
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return new MixedSqlNode(contents);
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}
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// org.apache.ibatis.scripting.xmltags.TextSqlNode#isDynamic
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public boolean isDynamic() {
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DynamicCheckerTokenParser checker = new DynamicCheckerTokenParser();
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GenericTokenParser parser = createParser(checker);
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parser.parse(text);
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return checker.isDynamic();
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}
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private GenericTokenParser createParser(TokenHandler handler) {
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return new GenericTokenParser("${", "}", handler);
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}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>可以看到其中一个条件就是是否有<code>${}</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><pre class="line-numbers language-Java" data-language="Java"><code class="language-Java">// org.apache.ibatis.scripting.xmltags.DynamicSqlSource
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public class DynamicSqlSource implements SqlSource {
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private final Configuration configuration;
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private final SqlNode rootSqlNode;
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public DynamicSqlSource(Configuration configuration, SqlNode rootSqlNode) {
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this.configuration = configuration;
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this.rootSqlNode = rootSqlNode;
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}
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|
|
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@Override
|
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public BoundSql getBoundSql(Object parameterObject) {
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DynamicContext context = new DynamicContext(configuration, parameterObject);
|
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rootSqlNode.apply(context);
|
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SqlSourceBuilder sqlSourceParser = new SqlSourceBuilder(configuration);
|
|
Class<?> parameterType = parameterObject == null ? Object.class : parameterObject.getClass();
|
|
SqlSource sqlSource = sqlSourceParser.parse(context.getSql(), parameterType, context.getBindings());
|
|
BoundSql boundSql = sqlSource.getBoundSql(parameterObject);
|
|
context.getBindings().forEach(boundSql::setAdditionalParameter);
|
|
return boundSql;
|
|
}
|
|
|
|
}
|
|
<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></code></pre><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://img.nicksxs.com/uPic/dnZWP7.png">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://img.nicksxs.com/uPic/YGVD0P.png">好像是这里了<br><img data-src="https://img.nicksxs.com/uPic/BWHuUO.png"><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://img.nicksxs.com/uPic/eTiQm6.png"><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://img.nicksxs.com/uPic/Cc4JPw.png"><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://img.nicksxs.com/uPic/fRHpNO.png"><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://img.nicksxs.com/uPic/4tNU7f.png"><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></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><nav class="pagination"><a class="extend prev" rel="prev" href="/page/22/"><i class="fa fa-angle-left" aria-label="上一页"></i></a><a class="page-number" href="/">1</a><span class="space">…</span><a class="page-number" href="/page/22/">22</a><span class="page-number current">23</span><a class="page-number" href="/page/24/">24</a><span class="space">…</span><a class="page-number" href="/page/36/">36</a><a class="extend next" rel="next" href="/page/24/"><i class="fa fa-angle-right" 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