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236 KiB
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class=tag-list-link href=/tags/Spring/ rel=tag>Spring</a><span class=tag-list-count>7</span><li class=tag-list-item><a class=tag-list-link href=/tags/Spring-Event/ rel=tag>Spring Event</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/SpringBoot/ rel=tag>SpringBoot</a><span class=tag-list-count>7</span><li class=tag-list-item><a class=tag-list-link href=/tags/Sql%E6%B3%A8%E5%85%A5/ rel=tag>Sql注入</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Stream/ rel=tag>Stream</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Synchronized/ rel=tag>Synchronized</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/Thread-dump/ rel=tag>Thread dump</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ThreadLocal/ rel=tag>ThreadLocal</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ThreadPool/ rel=tag>ThreadPool</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Tomcat/ rel=tag>Tomcat</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Trapping-Rain-Water/ rel=tag>Trapping Rain Water</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/WeakReference/ rel=tag>WeakReference</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Web/ rel=tag>Web</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Webhook/ rel=tag>Webhook</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Windows/ rel=tag>Windows</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/WordPress/ rel=tag>WordPress</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/aqs/ rel=tag>aqs</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/await/ rel=tag>await</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/bloom-filter/ rel=tag>bloom filter</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/c/ rel=tag>c++</a><span class=tag-list-count>14</span><li class=tag-list-item><a class=tag-list-link href=/tags/cglib/ rel=tag>cglib</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/cgroup/ rel=tag>cgroup</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/cluster/ rel=tag>cluster</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/condition/ rel=tag>condition</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/dnsmasq/ rel=tag>dnsmasq</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/dp/ rel=tag>dp</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/echo/ rel=tag>echo</a><span class=tag-list-count>1</span><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 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 class=tag-list-item><a class=tag-list-link href=/tags/gc/ rel=tag>gc</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/grep/ rel=tag>grep</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/headscale/ rel=tag>headscale</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/hexo/ rel=tag>hexo</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/im/ rel=tag>im</a><span class=tag-list-count>1</span><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 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 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 class=tag-list-item><a class=tag-list-link href=/tags/java/ rel=tag>java</a><span class=tag-list-count>35</span><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 class=tag-list-item><a class=tag-list-link href=/tags/leetcode/ rel=tag>leetcode</a><span class=tag-list-count>40</span><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 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 class=tag-list-item><a class=tag-list-link href=/tags/linux/ rel=tag>linux</a><span class=tag-list-count>3</span><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 class=tag-list-item><a class=tag-list-link href=/tags/mfc/ rel=tag>mfc</a><span class=tag-list-count>2</span><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 class=tag-list-item><a class=tag-list-link href=/tags/mq/ rel=tag>mq</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/mysql/ rel=tag>mysql</a><span class=tag-list-count>6</span><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 class=tag-list-item><a class=tag-list-link href=/tags/nas/ rel=tag>nas</a><span class=tag-list-count>6</span><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 class=tag-list-item><a class=tag-list-link href=/tags/nginx/ rel=tag>nginx</a><span class=tag-list-count>3</span><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 class=tag-list-item><a class=tag-list-link href=/tags/openresty/ rel=tag>openresty</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/php/ rel=tag>php</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/powershell/ rel=tag>powershell</a><span class=tag-list-count>2</span><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 class=tag-list-item><a class=tag-list-link href=/tags/python/ rel=tag>python</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/redis/ rel=tag>redis</a><span class=tag-list-count>12</span><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 class=tag-list-item><a class=tag-list-link href=/tags/signal/ rel=tag>signal</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/spark/ rel=tag>spark</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ssh/ rel=tag>ssh</a><span class=tag-list-count>3</span><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 class=tag-list-item><a class=tag-list-link href=/tags/stream/ rel=tag>stream</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/swoole/ rel=tag>swoole</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/uname/ rel=tag>uname</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/utf8/ rel=tag>utf8</a><span class=tag-list-count>1</span><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 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 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 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 class=tag-list-item><a class=tag-list-link href=/tags/value/ rel=tag>value</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/windows/ rel=tag>windows</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/wsl/ rel=tag>wsl</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/zsh/ rel=tag>zsh</a><span class=tag-list-count>1</span><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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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>7</span><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 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 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 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 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 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 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 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 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 class=tag-list-item><a class=tag-list-link href=/tags/%E5%8D%9A%E5%AE%A2%EF%BC%8C%E6%96%87%E7%AB%A0/ rel=tag>博客，文章</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8E%A6%E9%97%A8/ rel=tag>厦门</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE/ rel=tag>双亲委派</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%91%E8%A1%8C%E7%89%88/ rel=tag>发行版</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%A3%E7%BD%A9/ rel=tag>口罩</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/ rel=tag>可变引用</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%90%90%E6%A7%BD/ rel=tag>吐槽</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link 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 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 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 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 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 class=tag-list-item><a class=tag-list-link 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href=/tags/%E7%B1%BB%E5%8A%A0%E8%BD%BD/ rel=tag>类加载</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%B3%9F%E5%BF%83%E4%BA%8B/ rel=tag>糟心事</a><span class=tag-list-count>5</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%B4%A2%E5%BC%95/ rel=tag>索引</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BA%BF%E7%A8%8B%E6%B1%A0/ rel=tag>线程池</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98/ rel=tag>缓存</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98%E5%87%BB%E7%A9%BF/ rel=tag>缓存击穿</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98%E7%A9%BF%E9%80%8F/ rel=tag>缓存穿透</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link 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class=post-title><a class=post-title-link href=/2021/10/10/%E9%87%8D%E7%9C%8B%E4%BA%86%E4%B8%8B%E3%80%8A%E8%9B%AE%E8%8D%92%E8%AE%B0%E3%80%8B%E8%AF%B4%E8%AF%B4%E6%84%9F%E5%8F%97/ itemprop=url>重看了下《蛮荒记》说说感受</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 itemprop="dateCreated datePublished" title="创建时间：2021-10-10 20:44:23 / 修改时间：20:48:06" datetime=2021-10-10T20:44:23+08:00>2021-10-10</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><span class="post-meta-item leancloud_visitors" data-flag-title=重看了下《蛮荒记》说说感受 id=/2021/10/10/%E9%87%8D%E7%9C%8B%E4%BA%86%E4%B8%8B%E3%80%8A%E8%9B%AE%E8%8D%92%E8%AE%B0%E3%80%8B%E8%AF%B4%E8%AF%B4%E6%84%9F%E5%8F%97/ 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 href=/2021/10/10/%E9%87%8D%E7%9C%8B%E4%BA%86%E4%B8%8B%E3%80%8A%E8%9B%AE%E8%8D%92%E8%AE%B0%E3%80%8B%E8%AF%B4%E8%AF%B4%E6%84%9F%E5%8F%97/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2021/10/10/重看了下《蛮荒记》说说感受/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>周末把《蛮荒记》看完了，前面是发现微信读书有《搜神记》和《蛮荒记》，但是《搜神记》看了会发现很多都是跳段了，不知道为啥，貌似也没什么少儿不宜的情节，所以就上网找了原版来看，为什么看这个呢，主要还是高中的时候看过，觉得写得很不错，属于那时候的玄幻小说里的独一档，基于山海经创造了一个半架空的大荒宇宙，五族帝尊，人物名都是听说过的，而且又能契合部分历史，整个故事布局非常宏大，并且情节矛盾埋得很深，这里就不对具体情节作介绍了，只是聊聊对书中的一些人物和情节的看法感受。<p>乌丝兰玛是个贯穿两部，甚至在蛮荒的最后还要再搞事情，极其坚定的自以为是的大 boss，其实除了最后被我们的主人公打败，前面几乎就是无所不能，下了一盘无比巨大的棋，主人公都只是其中一个棋子和意外，但是正如很多反派，一直以来都是背着一个信念，并且这个所谓的信念是比较正义的，只是为了这个正义的信念和目标却做了各种丧尽天良的事情，说起来跟灭霸有点像，为了环保哈哈，相对来说感觉姬远玄也只是个最大牌的工具人，或者说是中间人，深爱的妹妹冰夷也意外被蚩尤怒拿一血。<p>但是中间那个赤霞仙子一定要给烈烟石的心上锁，导致最后认不出来蚩尤，也间接导致了蚩尤被杀，如果不考虑最后情节或者推动故事的需求，这个还是我很讨厌的，有点类似于《驴得水》里那个校长，看着貌似是个正常的，做的事情也是正派，但是其实是害人不浅，即使南阳仙子因此被抛进了火山，那也是有贱人在那挑食，并且赤松子是赤飚怒的儿子，烈烟石跟蚩尤又没这层关系，就很像倚天屠龙记里的灭绝师太和极品家丁里的那个玉德仙坊的院主，后者还好一些，前者几乎就是导致周芷若一生悲剧的始作俑者，自己偏执的善恶观，还要给徒弟灌输如此恶毒的理念和让她立下像紧箍咒似的誓言，在人一生中本来就有很多不能如愿的，又被最亲最尊敬的人下了这样的紧箍咒，人生的不幸也加倍了。<p>似乎习惯了总要有个总结的，想说的应该是我觉得这些剧也好，书也好，我觉得最坏的人可能是大部分人眼中的一些次要人物，或者至少大 boss 才是最坏的人，当然这个坏也不是严格的二分法，只是我觉得最让我觉得负面的人物，这些人可能看起来情景出现的不多，只是说了很少的话，做了很少的事，但是在我看来却做了最大的恶。</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2021/10/07/Leetcode-021-%E5%90%88%E5%B9%B6%E4%B8%A4%E4%B8%AA%E6%9C%89%E5%BA%8F%E9%93%BE%E8%A1%A8-Merge-Two-Sorted-Lists-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2021/10/07/Leetcode-021-%E5%90%88%E5%B9%B6%E4%B8%A4%E4%B8%AA%E6%9C%89%E5%BA%8F%E9%93%BE%E8%A1%A8-Merge-Two-Sorted-Lists-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/ itemprop=url>Leetcode 021 合并两个有序链表 ( Merge Two Sorted Lists ) 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 itemprop="dateCreated datePublished" title="创建时间：2021-10-07 23:03:16" datetime=2021-10-07T23:03:16+08:00>2021-10-07</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar-check"></i> </span><span class=post-meta-item-text>更新于</span> <time title="修改时间：2022-06-11 22:45:10" datetime=2022-06-11T22:45:10+08:00 itemprop=dateModified>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/leetcode/ itemprop=url rel=index><span itemprop=name>leetcode</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="Leetcode 021 合并两个有序链表 ( Merge Two Sorted Lists ) 题解分析" id=/2021/10/07/Leetcode-021-%E5%90%88%E5%B9%B6%E4%B8%A4%E4%B8%AA%E6%9C%89%E5%BA%8F%E9%93%BE%E8%A1%A8-Merge-Two-Sorted-Lists-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/ 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 href=/2021/10/07/Leetcode-021-%E5%90%88%E5%B9%B6%E4%B8%A4%E4%B8%AA%E6%9C%89%E5%BA%8F%E9%93%BE%E8%A1%A8-Merge-Two-Sorted-Lists-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2021/10/07/Leetcode-021-合并两个有序链表-Merge-Two-Sorted-Lists-题解分析/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><h3 id=题目介绍><a class=headerlink href=#题目介绍 title=题目介绍></a>题目介绍</h3><p>Merge two sorted linked lists and return it as a sorted list. The list should be made by splicing together the nodes of the first two lists.<p>将两个升序链表合并为一个新的 升序 链表并返回。新链表是通过拼接给定的两个链表的所有节点组成的。<h4 id=示例-1><a title="示例 1" class=headerlink href=#示例-1></a>示例 1</h4><p><img data-src=https://img.nicksxs.com/uPic/R1wHlz.jpg><blockquote><p><strong>输入</strong>：l1 = [1,2,4], l2 = [1,3,4]<br><strong>输出</strong>：[1,1,2,3,4,4]</blockquote><h4 id=示例-2><a title="示例 2" class=headerlink href=#示例-2></a>示例 2</h4><blockquote><p><strong>输入</strong>: l1 = [], l2 = []<br><strong>输出</strong>: []</blockquote><h4 id=示例-3><a title="示例 3" class=headerlink href=#示例-3></a>示例 3</h4><blockquote><p><strong>输入</strong>: l1 = [], l2 = [0]<br><strong>输出</strong>: [0]</blockquote><h3 id=简要分析><a class=headerlink href=#简要分析 title=简要分析></a>简要分析</h3><p>这题是 Easy 的，看着也挺简单，两个链表进行合并，就是比较下大小，可能将就点的话最好就在两个链表中原地合并<h3 id=题解代码><a class=headerlink href=#题解代码 title=题解代码></a>题解代码</h3><pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">ListNode</span> <span class="token function">mergeTwoLists</span><span class="token punctuation">(</span><span class="token class-name">ListNode</span> l1<span class="token punctuation">,</span> <span class="token class-name">ListNode</span> l2<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// 下面两个if判断了入参的边界，如果其一为null，直接返回另一个就可以了</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>l1 <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> l2<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>l2 <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> l1<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// new 一个合并后的头结点</span>
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<span class="token class-name">ListNode</span> merged <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ListNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// 这个是当前节点</span>
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<span class="token class-name">ListNode</span> current <span class="token operator">=</span> merged<span class="token punctuation">;</span>
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<span class="token comment">// 一开始给这个while加了l1和l2不全为null的条件，后面想了下不需要</span>
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<span class="token comment">// 因为内部前两个if就是跳出条件</span>
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<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token boolean">true</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>l1 <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">// 这里其实跟开头类似，只不过这里需要将l2剩余部分接到merged链表后面</span>
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<span class="token comment">// 所以不能是直接current = l2，这样就是把后面的直接丢了</span>
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current<span class="token punctuation">.</span>val <span class="token operator">=</span> l2<span class="token punctuation">.</span>val<span class="token punctuation">;</span>
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current<span class="token punctuation">.</span>next <span class="token operator">=</span> l2<span class="token punctuation">.</span>next<span class="token punctuation">;</span>
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<span class="token keyword">break</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>l2 <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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current<span class="token punctuation">.</span>val <span class="token operator">=</span> l1<span class="token punctuation">.</span>val<span class="token punctuation">;</span>
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current<span class="token punctuation">.</span>next <span class="token operator">=</span> l1<span class="token punctuation">.</span>next<span class="token punctuation">;</span>
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<span class="token keyword">break</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// 这里是两个链表都不为空的时候，就比较下大小</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>l1<span class="token punctuation">.</span>val <span class="token operator"><</span> l2<span class="token punctuation">.</span>val<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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current<span class="token punctuation">.</span>val <span class="token operator">=</span> l1<span class="token punctuation">.</span>val<span class="token punctuation">;</span>
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l1 <span class="token operator">=</span> l1<span class="token punctuation">.</span>next<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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current<span class="token punctuation">.</span>val <span class="token operator">=</span> l2<span class="token punctuation">.</span>val<span class="token punctuation">;</span>
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l2 <span class="token operator">=</span> l2<span class="token punctuation">.</span>next<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// 这里是new个新的，其实也可以放在循环头上</span>
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current<span class="token punctuation">.</span>next <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ListNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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current <span class="token operator">=</span> current<span class="token punctuation">.</span>next<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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current <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<span class="token comment">// 返回这个头结点</span>
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<span class="token keyword">return</span> merged<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></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><h3 id=结果><a class=headerlink href=#结果 title=结果></a>结果</h3><p><img data-src=https://img.nicksxs.com/uPic/4iHpzc.png></div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2021/10/03/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84%E6%B6%88%E6%81%AF%E5%AD%98%E5%82%A8%E4%B8%89/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2021/10/03/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84%E6%B6%88%E6%81%AF%E5%AD%98%E5%82%A8%E4%B8%89/ itemprop=url>聊一下 RocketMQ 的消息存储三</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 itemprop="dateCreated datePublished" title="创建时间：2021-10-03 20:17:37" datetime=2021-10-03T20:17:37+08:00>2021-10-03</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" datetime=2022-06-11T22:45:11+08:00 itemprop=dateModified>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/MQ/ itemprop=url rel=index><span itemprop=name>MQ</span></a> </span>， <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/MQ/RocketMQ/ itemprop=url rel=index><span itemprop=name>RocketMQ</span></a> </span>， <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/MQ/RocketMQ/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97/ itemprop=url rel=index><span itemprop=name>消息队列</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="聊一下 RocketMQ 的消息存储三" id=/2021/10/03/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84%E6%B6%88%E6%81%AF%E5%AD%98%E5%82%A8%E4%B8%89/ 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 href=/2021/10/03/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84%E6%B6%88%E6%81%AF%E5%AD%98%E5%82%A8%E4%B8%89/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2021/10/03/聊一下-RocketMQ-的消息存储三/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>ConsumeQueue 其实是定位到一个 topic 下的消息在 CommitLog 下的偏移量，它也是固定大小的<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token comment">// ConsumeQueue file size,default is 30W</span>
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<span class="token keyword">private</span> <span class="token keyword">int</span> mapedFileSizeConsumeQueue <span class="token operator">=</span> <span class="token number">300000</span> <span class="token operator">*</span> <span class="token class-name">ConsumeQueue</span><span class="token punctuation">.</span><span class="token constant">CQ_STORE_UNIT_SIZE</span><span class="token punctuation">;</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token keyword">int</span> <span class="token constant">CQ_STORE_UNIT_SIZE</span> <span class="token operator">=</span> <span class="token number">20</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>所以文件大小是5.7M 左右<p><img alt=5udpag data-src=https://img.nicksxs.com/uPic/5udpag.png><p>ConsumeQueue 的构建是通过<code>org.apache.rocketmq.store.DefaultMessageStore.ReputMessageService</code>运行后的 doReput 方法，而启动是的 reputFromOffset 则是通过<code>org.apache.rocketmq.store.DefaultMessageStore#start</code>中下面代码设置并启动<pre class="line-numbers language-java" data-language=java><code class=language-java>log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">"[SetReputOffset] maxPhysicalPosInLogicQueue={} clMinOffset={} clMaxOffset={} clConfirmedOffset={}"</span><span class="token punctuation">,</span>
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maxPhysicalPosInLogicQueue<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>commitLog<span class="token punctuation">.</span><span class="token function">getMinOffset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>commitLog<span class="token punctuation">.</span><span class="token function">getMaxOffset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>commitLog<span class="token punctuation">.</span><span class="token function">getConfirmOffset</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">this</span><span class="token punctuation">.</span>reputMessageService<span class="token punctuation">.</span><span class="token function">setReputFromOffset</span><span class="token punctuation">(</span>maxPhysicalPosInLogicQueue<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>reputMessageService<span class="token punctuation">.</span><span class="token function">start</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>看一下 doReput 的逻辑<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">doReput</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>reputFromOffset <span class="token operator"><</span> <span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>commitLog<span class="token punctuation">.</span><span class="token function">getMinOffset</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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log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"The reputFromOffset={} is smaller than minPyOffset={}, this usually indicate that the dispatch behind too much and the commitlog has expired."</span><span class="token punctuation">,</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>reputFromOffset<span class="token punctuation">,</span> <span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>commitLog<span class="token punctuation">.</span><span class="token function">getMinOffset</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">this</span><span class="token punctuation">.</span>reputFromOffset <span class="token operator">=</span> <span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>commitLog<span class="token punctuation">.</span><span class="token function">getMinOffset</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">for</span> <span class="token punctuation">(</span><span class="token keyword">boolean</span> doNext <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">isCommitLogAvailable</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&&</span> doNext<span class="token punctuation">;</span> <span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isDuplicationEnable</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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<span class="token operator">&&</span> <span class="token keyword">this</span><span class="token punctuation">.</span>reputFromOffset <span class="token operator">>=</span> <span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getConfirmOffset</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">break</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// 根据偏移量获取消息</span>
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<span class="token class-name">SelectMappedBufferResult</span> result <span class="token operator">=</span> <span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>commitLog<span class="token punctuation">.</span><span class="token function">getData</span><span class="token punctuation">(</span>reputFromOffset<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>result <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>reputFromOffset <span class="token operator">=</span> result<span class="token punctuation">.</span><span class="token function">getStartOffset</span><span class="token punctuation">(</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 keyword">int</span> readSize <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> readSize <span class="token operator"><</span> result<span class="token punctuation">.</span><span class="token function">getSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&&</span> doNext<span class="token punctuation">;</span> <span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// 消息校验和转换</span>
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<span class="token class-name">DispatchRequest</span> dispatchRequest <span class="token operator">=</span>
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<span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>commitLog<span class="token punctuation">.</span><span class="token function">checkMessageAndReturnSize</span><span class="token punctuation">(</span>result<span class="token punctuation">.</span><span class="token function">getByteBuffer</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">int</span> size <span class="token operator">=</span> dispatchRequest<span class="token punctuation">.</span><span class="token function">getBufferSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token operator">-</span><span class="token number">1</span> <span class="token operator">?</span> dispatchRequest<span class="token punctuation">.</span><span class="token function">getMsgSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">:</span> dispatchRequest<span class="token punctuation">.</span><span class="token function">getBufferSize</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>dispatchRequest<span class="token punctuation">.</span><span class="token function">isSuccess</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>size <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 comment">// 进行分发处理，包括 ConsumeQueue 和 IndexFile</span>
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<span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">doDispatch</span><span class="token punctuation">(</span>dispatchRequest<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">BrokerRole</span><span class="token punctuation">.</span><span class="token constant">SLAVE</span> <span class="token operator">!=</span> <span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getBrokerRole</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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<span class="token operator">&&</span> <span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>brokerConfig<span class="token punctuation">.</span><span class="token function">isLongPollingEnable</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">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>messageArrivingListener<span class="token punctuation">.</span><span class="token function">arriving</span><span class="token punctuation">(</span>dispatchRequest<span class="token punctuation">.</span><span class="token function">getTopic</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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dispatchRequest<span class="token punctuation">.</span><span class="token function">getQueueId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> dispatchRequest<span class="token punctuation">.</span><span class="token function">getConsumeQueueOffset</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">,</span>
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dispatchRequest<span class="token punctuation">.</span><span class="token function">getTagsCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> dispatchRequest<span class="token punctuation">.</span><span class="token function">getStoreTimestamp</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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dispatchRequest<span class="token punctuation">.</span><span class="token function">getBitMap</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> dispatchRequest<span class="token punctuation">.</span><span class="token function">getPropertiesMap</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">this</span><span class="token punctuation">.</span>reputFromOffset <span class="token operator">+=</span> size<span class="token punctuation">;</span>
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readSize <span class="token operator">+=</span> size<span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getBrokerRole</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token class-name">BrokerRole</span><span class="token punctuation">.</span><span class="token constant">SLAVE</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>storeStatsService
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<span class="token punctuation">.</span><span class="token function">getSinglePutMessageTopicTimesTotal</span><span class="token punctuation">(</span>dispatchRequest<span class="token punctuation">.</span><span class="token function">getTopic</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">incrementAndGet</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">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>storeStatsService
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<span class="token punctuation">.</span><span class="token function">getSinglePutMessageTopicSizeTotal</span><span class="token punctuation">(</span>dispatchRequest<span class="token punctuation">.</span><span class="token function">getTopic</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 class="token function">addAndGet</span><span class="token punctuation">(</span>dispatchRequest<span class="token punctuation">.</span><span class="token function">getMsgSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>size <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">this</span><span class="token punctuation">.</span>reputFromOffset <span class="token operator">=</span> <span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>commitLog<span class="token punctuation">.</span><span class="token function">rollNextFile</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>reputFromOffset<span class="token punctuation">)</span><span class="token punctuation">;</span>
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readSize <span class="token operator">=</span> result<span class="token punctuation">.</span><span class="token function">getSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>dispatchRequest<span class="token punctuation">.</span><span class="token function">isSuccess</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>size <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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log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">"[BUG]read total count not equals msg total size. reputFromOffset={}"</span><span class="token punctuation">,</span> reputFromOffset<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>reputFromOffset <span class="token operator">+=</span> size<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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doNext <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
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<span class="token comment">// If user open the dledger pattern or the broker is master node,</span>
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<span class="token comment">// it will not ignore the exception and fix the reputFromOffset variable</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isEnableDLegerCommitLog</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">||</span>
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<span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>brokerConfig<span class="token punctuation">.</span><span class="token function">getBrokerId</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token class-name">MixAll</span><span class="token punctuation">.</span><span class="token constant">MASTER_ID</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">"[BUG]dispatch message to consume queue error, COMMITLOG OFFSET: {}"</span><span class="token punctuation">,</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>reputFromOffset<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>reputFromOffset <span class="token operator">+=</span> result<span class="token punctuation">.</span><span class="token function">getSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> readSize<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<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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result<span class="token punctuation">.</span><span class="token function">release</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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doNext <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></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>分发的逻辑看到这<pre class="line-numbers language-java" data-language=java><code class=language-java> <span class="token keyword">class</span> <span class="token class-name">CommitLogDispatcherBuildConsumeQueue</span> <span class="token keyword">implements</span> <span class="token class-name">CommitLogDispatcher</span> <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 keyword">void</span> <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token class-name">DispatchRequest</span> request<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">final</span> <span class="token keyword">int</span> tranType <span class="token operator">=</span> <span class="token class-name">MessageSysFlag</span><span class="token punctuation">.</span><span class="token function">getTransactionValue</span><span class="token punctuation">(</span>request<span class="token punctuation">.</span><span class="token function">getSysFlag</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">switch</span> <span class="token punctuation">(</span>tranType<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">case</span> <span class="token class-name">MessageSysFlag</span><span class="token punctuation">.</span><span class="token constant">TRANSACTION_NOT_TYPE</span><span class="token operator">:</span>
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<span class="token keyword">case</span> <span class="token class-name">MessageSysFlag</span><span class="token punctuation">.</span><span class="token constant">TRANSACTION_COMMIT_TYPE</span><span class="token operator">:</span>
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<span class="token class-name">DefaultMessageStore</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">putMessagePositionInfo</span><span class="token punctuation">(</span>request<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">break</span><span class="token punctuation">;</span>
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<span class="token keyword">case</span> <span class="token class-name">MessageSysFlag</span><span class="token punctuation">.</span><span class="token constant">TRANSACTION_PREPARED_TYPE</span><span class="token operator">:</span>
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<span class="token keyword">case</span> <span class="token class-name">MessageSysFlag</span><span class="token punctuation">.</span><span class="token constant">TRANSACTION_ROLLBACK_TYPE</span><span class="token operator">:</span>
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<span class="token keyword">break</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">putMessagePositionInfo</span><span class="token punctuation">(</span><span class="token class-name">DispatchRequest</span> dispatchRequest<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">ConsumeQueue</span> cq <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">findConsumeQueue</span><span class="token punctuation">(</span>dispatchRequest<span class="token punctuation">.</span><span class="token function">getTopic</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> dispatchRequest<span class="token punctuation">.</span><span class="token function">getQueueId</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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cq<span class="token punctuation">.</span><span class="token function">putMessagePositionInfoWrapper</span><span class="token punctuation">(</span>dispatchRequest<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></code></pre><p>真正存储的是在这<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">private</span> <span class="token keyword">boolean</span> <span class="token function">putMessagePositionInfo</span><span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token keyword">long</span> offset<span class="token punctuation">,</span> <span class="token keyword">final</span> <span class="token keyword">int</span> size<span class="token punctuation">,</span> <span class="token keyword">final</span> <span class="token keyword">long</span> tagsCode<span class="token punctuation">,</span>
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<span class="token keyword">final</span> <span class="token keyword">long</span> cqOffset<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>offset <span class="token operator">+</span> size <span class="token operator"><=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>maxPhysicOffset<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"Maybe try to build consume queue repeatedly maxPhysicOffset={} phyOffset={}"</span><span class="token punctuation">,</span> maxPhysicOffset<span class="token punctuation">,</span> offset<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>byteBufferIndex<span class="token punctuation">.</span><span class="token function">flip</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>byteBufferIndex<span class="token punctuation">.</span><span class="token function">limit</span><span class="token punctuation">(</span><span class="token constant">CQ_STORE_UNIT_SIZE</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>byteBufferIndex<span class="token punctuation">.</span><span class="token function">putLong</span><span class="token punctuation">(</span>offset<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>byteBufferIndex<span class="token punctuation">.</span><span class="token function">putInt</span><span class="token punctuation">(</span>size<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>byteBufferIndex<span class="token punctuation">.</span><span class="token function">putLong</span><span class="token punctuation">(</span>tagsCode<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这里也可以看到 ConsumeQueue 的存储格式，<p><img alt=AA6Tve data-src=https://img.nicksxs.com/uPic/AA6Tve.jpg><p>偏移量，消息大小，跟 tag 的 hashCode</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2021/09/26/%E8%81%8A%E4%B8%80%E4%B8%8B-SpringBoot-%E4%B8%AD%E5%8A%A8%E6%80%81%E5%88%87%E6%8D%A2%E6%95%B0%E6%8D%AE%E6%BA%90%E7%9A%84%E6%96%B9%E6%B3%95/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2021/09/26/%E8%81%8A%E4%B8%80%E4%B8%8B-SpringBoot-%E4%B8%AD%E5%8A%A8%E6%80%81%E5%88%87%E6%8D%A2%E6%95%B0%E6%8D%AE%E6%BA%90%E7%9A%84%E6%96%B9%E6%B3%95/ itemprop=url>聊一下 SpringBoot 中动态切换数据源的方法</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 itemprop="dateCreated datePublished" title="创建时间：2021-09-26 17:41:49" datetime=2021-09-26T17:41:49+08:00>2021-09-26</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" datetime=2022-06-11T22:45:11+08:00 itemprop=dateModified>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/SpringBoot/ itemprop=url rel=index><span itemprop=name>SpringBoot</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="聊一下 SpringBoot 中动态切换数据源的方法" id=/2021/09/26/%E8%81%8A%E4%B8%80%E4%B8%8B-SpringBoot-%E4%B8%AD%E5%8A%A8%E6%80%81%E5%88%87%E6%8D%A2%E6%95%B0%E6%8D%AE%E6%BA%90%E7%9A%84%E6%96%B9%E6%B3%95/ 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 href=/2021/09/26/%E8%81%8A%E4%B8%80%E4%B8%8B-SpringBoot-%E4%B8%AD%E5%8A%A8%E6%80%81%E5%88%87%E6%8D%A2%E6%95%B0%E6%8D%AE%E6%BA%90%E7%9A%84%E6%96%B9%E6%B3%95/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2021/09/26/聊一下-SpringBoot-中动态切换数据源的方法/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>其实这个表示有点不太对，应该是 Druid 动态切换数据源的方法，只是应用在了 springboot 框架中，准备代码准备了半天，之前在一次数据库迁移中使用了，发现 Druid 还是很强大的，用来做动态数据源切换很方便。<p>首先这里的场景跟我原来用的有点点区别，在项目中使用的是通过配置中心控制数据源切换，统一切换，而这里的例子多加了个可以根据接口注解配置<p>第一部分是最核心的，如何基于 Spring JDBC 和 Druid 来实现数据源切换，是继承了<code>org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource</code> 这个类，他的<code>determineCurrentLookupKey</code>方法会被调用来获得用来决定选择那个数据源的对象，也就是 lookupKey，也可以通过这个类看到就是通过这个 lookupKey 来路由找到数据源。<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">DynamicDataSource</span> <span class="token keyword">extends</span> <span class="token class-name">AbstractRoutingDataSource</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@Override</span>
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<span class="token keyword">protected</span> <span class="token class-name">Object</span> <span class="token function">determineCurrentLookupKey</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">DatabaseContextHolder</span><span class="token punctuation">.</span><span class="token function">getDatabaseType</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 keyword">return</span> <span class="token class-name">DatabaseContextHolder</span><span class="token punctuation">.</span><span class="token function">getDatabaseType</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</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> <span class="token class-name">DatabaseType</span><span class="token punctuation">.</span><span class="token constant">MASTER1</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而如何使用这个 lookupKey 呢，就涉及到我们的 DataSource 配置了，原来就是我们可以直接通过spring 的 jdbc 配置数据源，像这样<p><img data-src=https://img.nicksxs.com/uPic/VQPrT3.png><p>现在我们要使用 Druid 作为数据源了，然后配置 <code>DynamicDataSource</code>的参数，通过 key 来选择对应的 DataSource，也就是下面配的 master1 和 master2<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>bean</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>master1<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>com.alibaba.druid.pool.DruidDataSource<span class="token punctuation">"</span></span> <span class="token attr-name">init-method</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>init<span class="token punctuation">"</span></span>
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<span class="token attr-name">destroy-method</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>close<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>driverClassName</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>com.mysql.cj.jdbc.Driver<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>url</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${master1.demo.datasource.url}<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>username</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${master1.demo.datasource.username}<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>password</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${master1.demo.datasource.password}<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>initialSize</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>5<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>minIdle</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>1<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>maxActive</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>10<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>maxWait</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>60000<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>timeBetweenEvictionRunsMillis</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>60000<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>minEvictableIdleTimeMillis</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>300000<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>validationQuery</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>SELECT 'x'<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>testWhileIdle</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>
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<span class="token attr-name"><span class="token namespace">p:</span>testOnBorrow</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>false<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>testOnReturn</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>false<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>poolPreparedStatements</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>false<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>maxPoolPreparedStatementPerConnectionSize</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>20<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>connectionProperties</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>config.decrypt=true<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>filters</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>stat,config<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>bean</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>master2<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>com.alibaba.druid.pool.DruidDataSource<span class="token punctuation">"</span></span> <span class="token attr-name">init-method</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>init<span class="token punctuation">"</span></span>
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<span class="token attr-name">destroy-method</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>close<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>driverClassName</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>com.mysql.cj.jdbc.Driver<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>url</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${master2.demo.datasource.url}<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>username</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${master2.demo.datasource.username}<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>password</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${master2.demo.datasource.password}<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>initialSize</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>5<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>minIdle</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>1<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>maxActive</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>10<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>maxWait</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>60000<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>timeBetweenEvictionRunsMillis</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>60000<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>minEvictableIdleTimeMillis</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>300000<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>validationQuery</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>SELECT 'x'<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>testWhileIdle</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>
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<span class="token attr-name"><span class="token namespace">p:</span>testOnBorrow</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>false<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>testOnReturn</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>false<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>poolPreparedStatements</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>false<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>maxPoolPreparedStatementPerConnectionSize</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>20<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>connectionProperties</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>config.decrypt=true<span class="token punctuation">"</span></span>
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<span class="token attr-name"><span class="token namespace">p:</span>filters</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>stat,config<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>bean</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>dataSource<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>com.nicksxs.springdemo.config.DynamicDataSource<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</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>targetDataSources<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>map</span> <span class="token attr-name">key-type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>java.lang.String<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token comment"><!-- master --></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>entry</span> <span class="token attr-name">key</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>master1<span class="token punctuation">"</span></span> <span class="token attr-name">value-ref</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>master1<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token comment"><!-- slave --></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>entry</span> <span class="token attr-name">key</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>master2<span class="token punctuation">"</span></span> <span class="token attr-name">value-ref</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>master2<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>map</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>property</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</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>defaultTargetDataSource<span class="token punctuation">"</span></span> <span class="token attr-name">ref</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>master1<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>bean</span><span class="token punctuation">></span></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></span><span></span><span></span><span></span><span></span><span></span><span></span><span></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>现在就要回到头上，介绍下这个<code>DatabaseContextHolder</code>，这里使用了 ThreadLocal 存放这个 DatabaseType，为啥要用这个是因为前面说的我们想要让接口层面去配置不同的数据源，要把持相互隔离不受影响，就使用了 ThreadLocal，关于它也可以看我前面写的一篇文章<a href=https://nicksxs.me/2021/05/30/%E8%81%8A%E8%81%8A%E4%BC%A0%E8%AF%B4%E4%B8%AD%E7%9A%84-ThreadLocal/>聊聊传说中的 ThreadLocal</a>，而 DatabaseType 就是个简单的枚举<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">DatabaseContextHolder</span> <span class="token punctuation">{</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token class-name">ThreadLocal</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">DatabaseType</span><span class="token punctuation">></span></span> databaseTypeThreadLocal <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ThreadLocal</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">public</span> <span class="token keyword">static</span> <span class="token class-name">DatabaseType</span> <span class="token function">getDatabaseType</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> databaseTypeThreadLocal<span class="token punctuation">.</span><span class="token function">get</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">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">putDatabaseType</span><span class="token punctuation">(</span><span class="token class-name">DatabaseType</span> databaseType<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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databaseTypeThreadLocal<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span>databaseType<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">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">clearDatabaseType</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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databaseTypeThreadLocal<span class="token punctuation">.</span><span class="token function">remove</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">public</span> <span class="token keyword">enum</span> <span class="token class-name">DatabaseType</span> <span class="token punctuation">{</span>
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<span class="token function">MASTER1</span><span class="token punctuation">(</span><span class="token string">"master1"</span><span class="token punctuation">,</span> <span class="token string">"1"</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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<span class="token function">MASTER2</span><span class="token punctuation">(</span><span class="token string">"master2"</span><span class="token punctuation">,</span> <span class="token string">"2"</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">String</span> name<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">String</span> value<span class="token punctuation">;</span>
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<span class="token class-name">DatabaseType</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">,</span> <span class="token class-name">String</span> value<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>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>value <span class="token operator">=</span> value<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> name<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">getValue</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> value<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token class-name">DatabaseType</span> <span class="token function">getDatabaseType</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token constant">MASTER2</span><span class="token punctuation">.</span>name<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>name<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token constant">MASTER2</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> <span class="token constant">MASTER1</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></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>这边可以看到就是通过动态地通过<code>putDatabaseType</code>设置<code>lookupKey</code>来进行数据源切换，要通过接口注解配置来进行设置的话，我们就需要一个注解<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Retention</span><span class="token punctuation">(</span><span class="token class-name">RetentionPolicy</span><span class="token punctuation">.</span><span class="token constant">RUNTIME</span><span class="token punctuation">)</span>
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<span class="token annotation punctuation">@Target</span><span class="token punctuation">(</span><span class="token class-name">ElementType</span><span class="token punctuation">.</span><span class="token constant">METHOD</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token annotation punctuation">@interface</span> <span class="token class-name">DataSource</span> <span class="token punctuation">{</span>
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<span class="token class-name">String</span> <span class="token function">value</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></code></pre><p>这个注解可以配置在我的接口方法上，比如这样<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">StudentService</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@DataSource</span><span class="token punctuation">(</span><span class="token string">"master1"</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token class-name">Student</span> <span class="token function">queryOne</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token annotation punctuation">@DataSource</span><span class="token punctuation">(</span><span class="token string">"master2"</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token class-name">Student</span> <span class="token function">queryAnother</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></span><span></span></span></code></pre><p>通过切面来进行数据源的设置<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Aspect</span>
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<span class="token annotation punctuation">@Component</span>
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<span class="token annotation punctuation">@Order</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">DataSourceAspect</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@Pointcut</span><span class="token punctuation">(</span><span class="token string">"execution(* com.nicksxs.springdemo.service..*.*(..))"</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">pointCut</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 annotation punctuation">@Before</span><span class="token punctuation">(</span><span class="token string">"pointCut()"</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">before</span><span class="token punctuation">(</span><span class="token class-name">JoinPoint</span> point<span class="token punctuation">)</span>
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<span class="token punctuation">{</span>
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<span class="token class-name">Object</span> target <span class="token operator">=</span> point<span class="token punctuation">.</span><span class="token function">getTarget</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">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>target<span class="token punctuation">.</span><span class="token function">toString</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">String</span> method <span class="token operator">=</span> point<span class="token punctuation">.</span><span class="token function">getSignature</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</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">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>method<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token operator">?</span><span class="token punctuation">></span></span><span class="token punctuation">[</span><span class="token punctuation">]</span> classz <span class="token operator">=</span> target<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 function">getInterfaces</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">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token operator">?</span><span class="token punctuation">></span></span><span class="token punctuation">[</span><span class="token punctuation">]</span> parameterTypes <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">MethodSignature</span><span class="token punctuation">)</span> point<span class="token punctuation">.</span><span class="token function">getSignature</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 class="token function">getMethod</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getParameterTypes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token class-name">Method</span> m <span class="token operator">=</span> classz<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">getMethod</span><span class="token punctuation">(</span>method<span class="token punctuation">,</span> parameterTypes<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"method"</span><span class="token operator">+</span> m<span class="token punctuation">.</span><span class="token function">getName</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>m<span class="token punctuation">.</span><span class="token function">isAnnotationPresent</span><span class="token punctuation">(</span><span class="token class-name">DataSource</span><span class="token punctuation">.</span><span class="token keyword">class</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">DataSource</span> data <span class="token operator">=</span> m<span class="token punctuation">.</span><span class="token function">getAnnotation</span><span class="token punctuation">(</span><span class="token class-name">DataSource</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 class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"dataSource："</span><span class="token operator">+</span>data<span class="token punctuation">.</span><span class="token function">value</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">DatabaseContextHolder</span><span class="token punctuation">.</span><span class="token function">putDatabaseType</span><span class="token punctuation">(</span><span class="token class-name">DatabaseType</span><span class="token punctuation">.</span><span class="token function">getDatabaseType</span><span class="token punctuation">(</span>data<span class="token punctuation">.</span><span class="token function">value</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><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">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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e<span class="token punctuation">.</span><span class="token function">printStackTrace</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 annotation punctuation">@After</span><span class="token punctuation">(</span><span class="token string">"pointCut()"</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">after</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">DatabaseContextHolder</span><span class="token punctuation">.</span><span class="token function">clearDatabaseType</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></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>通过接口判断是否带有注解跟是注解的值，DatabaseType 的配置不太好，不过先忽略了，然后在切点后进行清理<p>这是我 master1 的数据，<p><img data-src=https://img.nicksxs.com/uPic/sdQuJo.png><p>master2 的数据<p><img data-src=https://img.nicksxs.com/uPic/fXK1Wk.png><p>然后跑一下简单的 demo，<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token constant">LOGGER</span><span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">"run here"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>studentService<span class="token punctuation">.</span><span class="token function">queryOne</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">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>studentService<span class="token punctuation">.</span><span class="token function">queryAnother</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><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><p>看一下运行结果<p><img data-src=https://img.nicksxs.com/uPic/42VAeq.png><p>其实这个方法应用场景不止可以用来迁移数据库，还能实现精细化的读写数据源分离之类的，算是做个简单记录和分享。</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2021/09/19/%E8%81%8A%E4%B8%80%E4%B8%8B-SpringBoot-%E4%B8%AD%E4%BD%BF%E7%94%A8%E7%9A%84-cglib-%E4%BD%9C%E4%B8%BA%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E4%B8%AD%E7%9A%84%E4%B8%80%E4%B8%AA%E6%B3%A8%E6%84%8F%E7%82%B9/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2021/09/19/%E8%81%8A%E4%B8%80%E4%B8%8B-SpringBoot-%E4%B8%AD%E4%BD%BF%E7%94%A8%E7%9A%84-cglib-%E4%BD%9C%E4%B8%BA%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E4%B8%AD%E7%9A%84%E4%B8%80%E4%B8%AA%E6%B3%A8%E6%84%8F%E7%82%B9/ itemprop=url>聊一下 SpringBoot 中使用的 cglib 作为动态代理中的一个注意点</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 itemprop="dateCreated datePublished" title="创建时间：2021-09-19 22:56:31" datetime=2021-09-19T22:56:31+08:00>2021-09-19</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" datetime=2022-06-11T22:45:11+08:00 itemprop=dateModified>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/SpringBoot/ itemprop=url rel=index><span itemprop=name>SpringBoot</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="聊一下 SpringBoot 中使用的 cglib 作为动态代理中的一个注意点" id=/2021/09/19/%E8%81%8A%E4%B8%80%E4%B8%8B-SpringBoot-%E4%B8%AD%E4%BD%BF%E7%94%A8%E7%9A%84-cglib-%E4%BD%9C%E4%B8%BA%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E4%B8%AD%E7%9A%84%E4%B8%80%E4%B8%AA%E6%B3%A8%E6%84%8F%E7%82%B9/ 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 href=/2021/09/19/%E8%81%8A%E4%B8%80%E4%B8%8B-SpringBoot-%E4%B8%AD%E4%BD%BF%E7%94%A8%E7%9A%84-cglib-%E4%BD%9C%E4%B8%BA%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E4%B8%AD%E7%9A%84%E4%B8%80%E4%B8%AA%E6%B3%A8%E6%84%8F%E7%82%B9/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2021/09/19/聊一下-SpringBoot-中使用的-cglib-作为动态代理中的一个注意点/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>这个话题是由一次组内同学分享引出来的，首先在 springboot 2.x 开始默认使用了 cglib 作为 aop 的实现，这里也稍微讲一下，在一个 1.x 的老项目里，可以看到AopAutoConfiguration 是这样的<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Configuration</span>
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<span class="token annotation punctuation">@ConditionalOnClass</span><span class="token punctuation">(</span><span class="token punctuation">{</span> <span class="token class-name">EnableAspectJAutoProxy</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> <span class="token class-name">Aspect</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> <span class="token class-name">Advice</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 annotation punctuation">@ConditionalOnProperty</span><span class="token punctuation">(</span>prefix <span class="token operator">=</span> <span class="token string">"spring.aop"</span><span class="token punctuation">,</span> name <span class="token operator">=</span> <span class="token string">"auto"</span><span class="token punctuation">,</span> havingValue <span class="token operator">=</span> <span class="token string">"true"</span><span class="token punctuation">,</span> matchIfMissing <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">AopAutoConfiguration</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@Configuration</span>
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<span class="token annotation punctuation">@EnableAspectJAutoProxy</span><span class="token punctuation">(</span>proxyTargetClass <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">)</span>
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<span class="token annotation punctuation">@ConditionalOnProperty</span><span class="token punctuation">(</span>prefix <span class="token operator">=</span> <span class="token string">"spring.aop"</span><span class="token punctuation">,</span> name <span class="token operator">=</span> <span class="token string">"proxy-target-class"</span><span class="token punctuation">,</span> havingValue <span class="token operator">=</span> <span class="token string">"false"</span><span class="token punctuation">,</span> matchIfMissing <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">class</span> <span class="token class-name">JdkDynamicAutoProxyConfiguration</span> <span class="token punctuation">{</span>
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<span class="token punctuation">}</span>
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<span class="token annotation punctuation">@Configuration</span>
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<span class="token annotation punctuation">@EnableAspectJAutoProxy</span><span class="token punctuation">(</span>proxyTargetClass <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
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<span class="token annotation punctuation">@ConditionalOnProperty</span><span class="token punctuation">(</span>prefix <span class="token operator">=</span> <span class="token string">"spring.aop"</span><span class="token punctuation">,</span> name <span class="token operator">=</span> <span class="token string">"proxy-target-class"</span><span class="token punctuation">,</span> havingValue <span class="token operator">=</span> <span class="token string">"true"</span><span class="token punctuation">,</span> matchIfMissing <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">class</span> <span class="token class-name">CglibAutoProxyConfiguration</span> <span class="token punctuation">{</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而在 2.x 中变成了这样<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Configuration</span><span class="token punctuation">(</span>proxyBeanMethods <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">)</span>
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<span class="token annotation punctuation">@ConditionalOnProperty</span><span class="token punctuation">(</span>prefix <span class="token operator">=</span> <span class="token string">"spring.aop"</span><span class="token punctuation">,</span> name <span class="token operator">=</span> <span class="token string">"auto"</span><span class="token punctuation">,</span> havingValue <span class="token operator">=</span> <span class="token string">"true"</span><span class="token punctuation">,</span> matchIfMissing <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">AopAutoConfiguration</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@Configuration</span><span class="token punctuation">(</span>proxyBeanMethods <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">)</span>
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<span class="token annotation punctuation">@ConditionalOnClass</span><span class="token punctuation">(</span><span class="token class-name">Advice</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span>
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<span class="token keyword">static</span> <span class="token keyword">class</span> <span class="token class-name">AspectJAutoProxyingConfiguration</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@Configuration</span><span class="token punctuation">(</span>proxyBeanMethods <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">)</span>
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<span class="token annotation punctuation">@EnableAspectJAutoProxy</span><span class="token punctuation">(</span>proxyTargetClass <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">)</span>
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<span class="token annotation punctuation">@ConditionalOnProperty</span><span class="token punctuation">(</span>prefix <span class="token operator">=</span> <span class="token string">"spring.aop"</span><span class="token punctuation">,</span> name <span class="token operator">=</span> <span class="token string">"proxy-target-class"</span><span class="token punctuation">,</span> havingValue <span class="token operator">=</span> <span class="token string">"false"</span><span class="token punctuation">)</span>
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<span class="token keyword">static</span> <span class="token keyword">class</span> <span class="token class-name">JdkDynamicAutoProxyConfiguration</span> <span class="token punctuation">{</span>
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<span class="token punctuation">}</span>
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<span class="token annotation punctuation">@Configuration</span><span class="token punctuation">(</span>proxyBeanMethods <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">)</span>
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<span class="token annotation punctuation">@EnableAspectJAutoProxy</span><span class="token punctuation">(</span>proxyTargetClass <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
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<span class="token annotation punctuation">@ConditionalOnProperty</span><span class="token punctuation">(</span>prefix <span class="token operator">=</span> <span class="token string">"spring.aop"</span><span class="token punctuation">,</span> name <span class="token operator">=</span> <span class="token string">"proxy-target-class"</span><span class="token punctuation">,</span> havingValue <span class="token operator">=</span> <span class="token string">"true"</span><span class="token punctuation">,</span>
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matchIfMissing <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
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<span class="token keyword">static</span> <span class="token keyword">class</span> <span class="token class-name">CglibAutoProxyConfiguration</span> <span class="token punctuation">{</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>为何会加载 AopAutoConfiguration 在前面的文章<a href=https://nicksxs.me/2021/07/11/%E8%81%8A%E8%81%8ASpringBoot-%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D/>聊聊 SpringBoot 自动装配</a>里已经介绍过，有兴趣的可以看下，可以发现 springboot 在 2.x 版本开始使用 cglib 作为默认的动态代理实现。<p>然后就是出现的问题了，代码是这样的，一个简单的基于 springboot 的带有数据库的插入，对插入代码加了事务注解，<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Mapper</span>
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<span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">StudentMapper</span> <span class="token punctuation">{</span>
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<span class="token comment">// 就是插入一条数据</span>
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<span class="token annotation punctuation">@Insert</span><span class="token punctuation">(</span><span class="token string">"insert into student(name, age)"</span> <span class="token operator">+</span> <span class="token string">"values ('nick', '18')"</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token class-name">Long</span> <span class="token function">insert</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 annotation punctuation">@Component</span>
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<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">StudentManager</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@Resource</span>
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<span class="token keyword">private</span> <span class="token class-name">StudentMapper</span> studentMapper<span class="token punctuation">;</span>
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<span class="token keyword">public</span> <span class="token class-name">Long</span> <span class="token function">createStudent</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> studentMapper<span class="token punctuation">.</span><span class="token function">insert</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 annotation punctuation">@Component</span>
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<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">StudentServiceImpl</span> <span class="token keyword">implements</span> <span class="token class-name">StudentService</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@Resource</span>
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<span class="token keyword">private</span> <span class="token class-name">StudentManager</span> studentManager<span class="token punctuation">;</span>
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<span class="token comment">// 自己引用</span>
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<span class="token annotation punctuation">@Resource</span>
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<span class="token keyword">private</span> <span class="token class-name">StudentServiceImpl</span> studentService<span class="token punctuation">;</span>
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<span class="token annotation punctuation">@Override</span>
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<span class="token annotation punctuation">@Transactional</span>
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<span class="token keyword">public</span> <span class="token class-name">Long</span> <span class="token function">createStudent</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">Long</span> id <span class="token operator">=</span> studentManager<span class="token punctuation">.</span><span class="token function">createStudent</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">Long</span> id2 <span class="token operator">=</span> studentService<span class="token punctuation">.</span><span class="token function">createStudent2</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> <span class="token number">1L</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token annotation punctuation">@Transactional</span>
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<span class="token keyword">private</span> <span class="token class-name">Long</span> <span class="token function">createStudent2</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// Integer t = Integer.valueOf("aaa");</span>
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<span class="token keyword">return</span> studentManager<span class="token punctuation">.</span><span class="token function">createStudent</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></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>第一个公有方法 createStudent 首先调用了 manager 层的创建方法，然后再通过引入的 studentService 调用了createStudent2，我们先跑一下看看会出现啥情况，果不其然报错了，正是这个报错让我纠结了很久<p><img alt=EdR7oB data-src=https://img.nicksxs.com/uPic/EdR7oB.png><p>报了个空指针，而且是在 createStudent2 已经被调用到了，在它的内部，报的 studentManager 是 null，首先 cglib 作为动态代理它是通过继承的方式来实现的，相当于是会在调用目标对象的代理方法时调用 cglib 生成的子类，具体的代理切面逻辑在子类实现，然后在调用目标对象的目标方法，但是继承的方式对于 final 和私有方法其实是没法进行代理的，因为没法继承，所以我最开始的想法是应该通过 studentService 调用 createStudent2 的时候就报错了，也就是不会进入这个方法内部，后面才发现犯了个特别二的错误，继承的方式去调用父类的私有方法，对于 Java 来说是可以调用到的，父类的私有方法并不由子类的InstanceKlass维护，只能通过子类的InstanceKlass找到Java类对应的_super，这样间接地访问。也就是说子类其实是可以访问的，那为啥访问了会报空指针呢，这里报的是studentManager 是空的，可以往依赖注入方面去想，如果忽略依赖注入，我这个studentManager 的确是 null，那是不是就没有被依赖注入呢，但是为啥前面那个可以呢<p>这个问题着实查了很久，不废话来看代码<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
|
|
<span class="token keyword">protected</span> <span class="token class-name">Object</span> <span class="token function">invokeJoinpoint</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Throwable</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>methodProxy <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token comment">// 这里的 target 就是被代理的 bean</span>
|
|
<span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>methodProxy<span class="token punctuation">.</span><span class="token function">invoke</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>target<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>arguments<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token keyword">else</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> <span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">invokeJoinpoint</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><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></code></pre><p>这个是<code>org.springframework.aop.framework.CglibAopProxy.CglibMethodInvocation</code>的代码，其实它在这里不是直接调用 super 也就是父类的方法，而是通过 methodProxy 调用 target 目标对象的方法，也就是原始的 studentService bean 的方法，这样子 spring 管理的已经做好依赖注入的 bean 就能正常起作用，否则就会出现上面的问题，因为 cglib 其实是通过继承来实现，通过将调用转移到子类上加入代理逻辑，我们在简单使用的时候会直接 invokeSuper() 调用父类的方法，但是在这里 spring 的场景里需要去支持 spring 的功能逻辑，所以上面的问题就可以开始来解释了，因为 createStudent 是公共方法，cglib 可以对其进行继承代理，但是在执行逻辑的时候其实是通过调用目标对象，也就是 spring 管理的被代理的目标对象的 bean 调用的 createStudent，而对于下面的 createStudent2 方法因为是私有方法，不会走代理逻辑，也就不会有调用回目标对象的逻辑，只是通过继承关系，在子类中没有这个方法，所以会通过子类的InstanceKlass找到这个类对应的_super，然后调用父类的这个私有方法，这里要搞清楚一个点，从这个代理类直接找到其父类然后调用这个私有方法，这个类是由 cglib 生成的，不是被 spring 管理起来经过依赖注入的 bean，所以是没有 studentManager 这个依赖的，也就出现了前面的问题<p>而在前面提到的cglib通过methodProxy调用到目标对象，目标对象是在什么时候设置的呢，其实是在bean的生命周期中，org.springframework.beans.factory.config.BeanPostProcessor#postProcessAfterInitialization这个接口的在bean的初始化过程中，会调用实现了这个接口的方法，<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">Object</span> <span class="token function">postProcessAfterInitialization</span><span class="token punctuation">(</span><span class="token annotation punctuation">@Nullable</span> <span class="token class-name">Object</span> bean<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">if</span> <span class="token punctuation">(</span>bean <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token class-name">Object</span> cacheKey <span class="token operator">=</span> <span class="token function">getCacheKey</span><span class="token punctuation">(</span>bean<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> beanName<span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>earlyProxyReferences<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">)</span> <span class="token operator">!=</span> bean<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">return</span> <span class="token function">wrapIfNecessary</span><span class="token punctuation">(</span>bean<span class="token punctuation">,</span> beanName<span class="token punctuation">,</span> cacheKey<span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token keyword">return</span> bean<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>具体的逻辑在 org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator#wrapIfNecessary这个方法里<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">protected</span> <span class="token class-name">Object</span> <span class="token function">getCacheKey</span><span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token operator">?</span><span class="token punctuation">></span></span> beanClass<span class="token punctuation">,</span> <span class="token annotation punctuation">@Nullable</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">StringUtils</span><span class="token punctuation">.</span><span class="token function">hasLength</span><span class="token punctuation">(</span>beanName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token punctuation">(</span><span class="token class-name">FactoryBean</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">.</span><span class="token function">isAssignableFrom</span><span class="token punctuation">(</span>beanClass<span class="token punctuation">)</span> <span class="token operator">?</span>
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<span class="token class-name">BeanFactory</span><span class="token punctuation">.</span><span class="token constant">FACTORY_BEAN_PREFIX</span> <span class="token operator">+</span> beanName <span class="token operator">:</span> beanName<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">else</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">return</span> beanClass<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 comment">/**
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|
* Wrap the given bean if necessary, i.e. if it is eligible for being proxied.
|
|
* @param bean the raw bean instance
|
|
* @param beanName the name of the bean
|
|
* @param cacheKey the cache key for metadata access
|
|
* @return a proxy wrapping the bean, or the raw bean instance as-is
|
|
*/</span>
|
|
<span class="token keyword">protected</span> <span class="token class-name">Object</span> <span class="token function">wrapIfNecessary</span><span class="token punctuation">(</span><span class="token class-name">Object</span> bean<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">,</span> <span class="token class-name">Object</span> cacheKey<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">StringUtils</span><span class="token punctuation">.</span><span class="token function">hasLength</span><span class="token punctuation">(</span>beanName<span class="token punctuation">)</span> <span class="token operator">&&</span> <span class="token keyword">this</span><span class="token punctuation">.</span>targetSourcedBeans<span class="token punctuation">.</span><span class="token function">contains</span><span class="token punctuation">(</span>beanName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> bean<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">Boolean</span><span class="token punctuation">.</span><span class="token constant">FALSE</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>advisedBeans<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> bean<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isInfrastructureClass</span><span class="token punctuation">(</span>bean<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 operator">||</span> <span class="token function">shouldSkip</span><span class="token punctuation">(</span>bean<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> beanName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">this</span><span class="token punctuation">.</span>advisedBeans<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">,</span> <span class="token class-name">Boolean</span><span class="token punctuation">.</span><span class="token constant">FALSE</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token keyword">return</span> bean<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token comment">// Create proxy if we have advice.</span>
|
|
<span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token punctuation">]</span> specificInterceptors <span class="token operator">=</span> <span class="token function">getAdvicesAndAdvisorsForBean</span><span class="token punctuation">(</span>bean<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> beanName<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token keyword">if</span> <span class="token punctuation">(</span>specificInterceptors <span class="token operator">!=</span> <span class="token constant">DO_NOT_PROXY</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">this</span><span class="token punctuation">.</span>advisedBeans<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">,</span> <span class="token class-name">Boolean</span><span class="token punctuation">.</span><span class="token constant">TRUE</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token class-name">Object</span> proxy <span class="token operator">=</span> <span class="token function">createProxy</span><span class="token punctuation">(</span>
|
|
bean<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> beanName<span class="token punctuation">,</span> specificInterceptors<span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">SingletonTargetSource</span><span class="token punctuation">(</span>bean<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token keyword">this</span><span class="token punctuation">.</span>proxyTypes<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">,</span> proxy<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 keyword">return</span> proxy<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token keyword">this</span><span class="token punctuation">.</span>advisedBeans<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">,</span> <span class="token class-name">Boolean</span><span class="token punctuation">.</span><span class="token constant">FALSE</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token keyword">return</span> bean<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>然后在 <code>org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator#createProxy</code> 中创建了代理类</div><footer class=post-footer><div class=post-eof></div></footer></article></div><nav class=pagination><a class="extend prev" aria-label=上一页 href=/page/20/ rel=prev title=上一页><i class="fa fa-angle-left"></i></a><a class=page-number 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