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259 KiB
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Theme: Default
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Description: Original highlight.js style
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License: see project LICENSE
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Touched: 2021
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rel=tag>Mybatis</a><span class=tag-list-count>13</span><li class=tag-list-item><a class=tag-list-link href=/tags/Mysql/ rel=tag>Mysql</a><span class=tag-list-count>13</span><li class=tag-list-item><a class=tag-list-link href=/tags/NameServer/ rel=tag>NameServer</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/PHP/ rel=tag>PHP</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/Preorder-Traversal/ rel=tag>Preorder Traversal</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Print-FooBar-Alternately/ rel=tag>Print FooBar Alternately</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/RPC/ rel=tag>RPC</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/Redis/ rel=tag>Redis</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/Remove-Duplicates-from-Sorted-List/ rel=tag>Remove Duplicates from Sorted List</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/RocketMQ/ rel=tag>RocketMQ</a><span class=tag-list-count>9</span><li class=tag-list-item><a class=tag-list-link href=/tags/Rotate-Image/ rel=tag>Rotate Image</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Rust/ rel=tag>Rust</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/SPI/ rel=tag>SPI</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/Servlet/ rel=tag>Servlet</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Sharding-Jdbc/ rel=tag>Sharding-Jdbc</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/Shift-2D-Grid/ rel=tag>Shift 2D Grid</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Singleton/ rel=tag>Singleton</a><span class=tag-list-count>1</span><li class=tag-list-item><a 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>22</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>13</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>5</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>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/grep/ rel=tag>grep</a><span class=tag-list-count>3</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>6</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/http/ rel=tag>http</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>2</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>54</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>44</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>7</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/mac/ rel=tag>mac</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>9</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/openwrt/ rel=tag>openwrt</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>6</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>3</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/trace/ rel=tag>trace</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>3</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>2</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%91%E6%9C%8D%E5%8A%A1%E5%99%A8/ rel=tag>云服务器</a><span class=tag-list-count>1</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 href=/tags/%E5%AE%89%E5%85%A8/ rel=tag>安全</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%AE%B9%E9%94%99%E6%9C%BA%E5%88%B6/ rel=tag>容错机制</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%AF%84%E7%94%9F%E8%99%AB/ rel=tag>寄生虫</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B0%84%E5%87%BB/ rel=tag>射击</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B0%8F%E6%8A%80%E5%B7%A7/ rel=tag>小技巧</a><span class=tag-list-count>10</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B1%80%E5%8F%A3%E8%A1%97/ rel=tag>局口街</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B7%A5%E5%85%B7/ rel=tag>工具</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B8%83%E9%9A%86%E8%BF%87%E6%BB%A4%E5%99%A8/ rel=tag>布隆过滤器</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%B2%E6%B4%BB/ rel=tag>干活</a><span class=tag-list-count>6</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/ rel=tag>年中总结</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/ rel=tag>年终总结</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%B6%E5%8F%91/ rel=tag>并发</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%B8%E7%A6%8F%E4%BA%86%E5%90%97/ rel=tag>幸福了吗</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%BB%E8%AF%BB/ rel=tag>幻读</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%BA%94%E7%94%A8/ rel=tag>应用</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%BC%80%E8%BD%A6/ rel=tag>开车</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%BC%B1%E5%BC%95%E7%94%A8/ rel=tag>弱引用</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%BD%B1%E8%AF%84/ rel=tag>影评</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%81%B6%E6%84%8F%E7%9B%97%E5%88%B7/ rel=tag>恶意盗刷</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%89%80%E6%9C%89%E6%9D%83/ rel=tag>所有权</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%89%93%E5%8D%A1/ rel=tag>打卡</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%89%B6%E6%A2%AF/ rel=tag>扶梯</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8A%80%E5%B7%A7/ rel=tag>技巧</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8A%80%E6%9C%AF/ rel=tag>技术</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8A%98%E8%85%BE/ rel=tag>折腾</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8B%96%E6%9B%B4/ rel=tag>拖更</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8D%A2%E8%BD%A6%E7%89%8C/ rel=tag>换车牌</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8E%92%E5%BA%8F/ rel=tag>排序</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8E%A5%E9%9B%A8%E6%B0%B4/ rel=tag>接雨水</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%95%B0%E6%8D%AE%E6%BA%90%E5%8A%A8%E6%80%81%E5%88%87%E6%8D%A2/ rel=tag>数据源动态切换</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/ rel=tag>数据结构</a><span class=tag-list-count>11</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%96%B0%E8%AF%AD%E8%A8%80/ rel=tag>新语言</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%97%85%E6%B8%B8/ rel=tag>旅游</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%97%A5%E5%BF%97/ rel=tag>日志</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9B%BE%E5%8E%9D%E5%9E%B5/ rel=tag>曾厝垵</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9C%80%E5%B0%8F%E6%A0%88/ rel=tag>最小栈</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9D%80%E4%BA%BA%E8%AF%9B%E5%BF%83/ rel=tag>杀人诛心</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9D%AD%E5%B7%9E/ rel=tag>杭州</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%A0%87%E8%AE%B0%E6%95%B4%E7%90%86/ rel=tag>标记整理</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%A4%8D%E7%89%A9%E5%9B%AD/ rel=tag>植物园</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B2%99%E8%8C%B6%E9%9D%A2/ rel=tag>沙茶面</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B3%A8%E8%A7%A3/ rel=tag>注解</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B5%B7%E8%9B%8E%E7%85%8E/ rel=tag>海蛎煎</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97/ rel=tag>消息队列</a><span class=tag-list-count>9</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B7%98%E6%B1%B0%E7%AD%96%E7%95%A5/ rel=tag>淘汰策略</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B7%B1%E5%BA%A6%E5%AD%A6%E4%B9%A0/ rel=tag>深度学习</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%BA%90%E7%A0%81/ rel=tag>源码</a><span class=tag-list-count>11</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%BA%90%E7%A0%81%E8%A7%A3%E6%9E%90/ rel=tag>源码解析</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%94%9F%E6%B4%BB/ rel=tag>生活</a><span class=tag-list-count>42</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%94%B5%E7%93%B6%E8%BD%A6/ rel=tag>电瓶车</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%96%AB%E6%83%85/ rel=tag>疫情</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9C%8B%E4%B9%A6/ rel=tag>看书</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9C%8B%E5%89%A7/ rel=tag>看剧</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9F%A9%E9%98%B5/ rel=tag>矩阵</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%AB%AF%E5%8F%A3%E8%BD%AC%E5%8F%91/ rel=tag>端口转发</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%AE%97%E6%B3%95/ rel=tag>算法</a><span class=tag-list-count>5</span><li class=tag-list-item><a class=tag-list-link 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 href=/tags/%E7%BC%93%E5%AD%98%E9%9B%AA%E5%B4%A9/ rel=tag>缓存雪崩</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%96%E7%A0%81/ rel=tag>编码</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BE%8E%E5%9B%BD/ rel=tag>美国</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%80%81%E7%94%B5%E8%84%91/ rel=tag>老电脑</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D/ rel=tag>自动装配</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%87%AA%E6%97%8B/ rel=tag>自旋</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/ rel=tag>自适应拓展</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%A3%85%E7%94%B5%E8%84%91/ rel=tag>装电脑</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%A7%84%E5%88%99/ rel=tag>规则</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%A7%A3%E6%9E%90/ rel=tag>解析</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/ rel=tag>设计模式</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%AF%BB%E4%B9%A6/ rel=tag>读书</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%AF%BB%E5%90%8E%E6%84%9F/ rel=tag>读后感</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B4%9F%E8%BD%BD%E5%9D%87%E8%A1%A1/ rel=tag>负载均衡</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B6%B3%E7%90%83/ rel=tag>足球</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%91%E6%AD%A5/ rel=tag>跑步</a><span class=tag-list-count>7</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%AF%E6%94%BF%E8%A7%84%E5%88%92/ rel=tag>路政规划</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%AF%E7%94%B1%E5%99%A8/ rel=tag>路由器</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%B3%E6%B0%B4/ rel=tag>跳水</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B8%A9%E8%B8%8F/ rel=tag>踩踏</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%BD%AC%E4%B9%89/ rel=tag>转义</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%BD%BB%E9%87%8F%E7%BA%A7%E9%94%81/ rel=tag>轻量级锁</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%BF%87%E6%9C%9F%E7%AD%96%E7%95%A5/ rel=tag>过期策略</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%BF%90%E5%8A%A8/ rel=tag>运动</a><span class=tag-list-count>9</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%BF%9C%E7%A8%8B%E5%8A%9E%E5%85%AC/ rel=tag>远程办公</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E9%80%92%E5%BD%92/ rel=tag>递归</a><span class=tag-list-count>1</span><li 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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=/2023/10/21/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%85%AD-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Lifecycle/ itemprop=url>Tomcat 系列篇六-介绍下 Lifecycle</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：2023-10-21 20:30:32" datetime=2023-10-21T20:30:32+08:00>2023-10-21</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：2023-11-05 19:09:18" datetime=2023-11-05T19:09:18+08:00 itemprop=dateModified>2023-11-05</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 itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/SpringBoot/Tomcat/ itemprop=url rel=index><span itemprop=name>Tomcat</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="Tomcat 系列篇六-介绍下 Lifecycle" id=/2023/10/21/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%85%AD-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Lifecycle/ 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=/2023/10/21/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%85%AD-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Lifecycle/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/10/21/Tomcat-系列篇六-介绍下-Lifecycle/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>Tomcat 中的很多组件都是继承了LifecycleBase这个抽象类的，包括之前讲过的 connector，server，service，context，host 这些组件都是，我们先来看下接口<br>主体是分为两部分，第一部分是定义状态时间，如 before_init 和 after_init，跟事件监听器的几个方法，添加查询和移除，第二部分是生命周期的相关方法，初始化开始结束与销毁等方法<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>interface</span> <span class="title class_">Lifecycle</span> {</span><br><span class=line></span><br><span class=line></span><br><span class=line> </span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>BEFORE_INIT_EVENT</span> <span class=operator>=</span> <span class=string>"before_init"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>AFTER_INIT_EVENT</span> <span class=operator>=</span> <span class=string>"after_init"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>START_EVENT</span> <span class=operator>=</span> <span class=string>"start"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>BEFORE_START_EVENT</span> <span class=operator>=</span> <span class=string>"before_start"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>AFTER_START_EVENT</span> <span class=operator>=</span> <span class=string>"after_start"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>STOP_EVENT</span> <span class=operator>=</span> <span class=string>"stop"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>BEFORE_STOP_EVENT</span> <span class=operator>=</span> <span class=string>"before_stop"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>AFTER_STOP_EVENT</span> <span class=operator>=</span> <span class=string>"after_stop"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>AFTER_DESTROY_EVENT</span> <span class=operator>=</span> <span class=string>"after_destroy"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>BEFORE_DESTROY_EVENT</span> <span class=operator>=</span> <span class=string>"before_destroy"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>PERIODIC_EVENT</span> <span class=operator>=</span> <span class=string>"periodic"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>CONFIGURE_START_EVENT</span> <span class=operator>=</span> <span class=string>"configure_start"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>CONFIGURE_STOP_EVENT</span> <span class=operator>=</span> <span class=string>"configure_stop"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">addLifecycleListener</span><span class=params>(LifecycleListener listener)</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> LifecycleListener[] findLifecycleListeners();</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">removeLifecycleListener</span><span class=params>(LifecycleListener listener)</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">init</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">start</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">stop</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">destroy</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> LifecycleState <span class="title function_">getState</span><span class=params>()</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> String <span class="title function_">getStateName</span><span class=params>()</span>;</span><br><span class=line></span><br><span class=line></span><br><span class=line> <span class=comment>/**</span></span><br><span class=line><span class=comment> * Marker interface used to indicate that the instance should only be used</span></span><br><span class=line><span class=comment> * once. Calling {<span class=doctag>@link</span> #stop()} on an instance that supports this interface</span></span><br><span class=line><span class=comment> * will automatically call {<span class=doctag>@link</span> #destroy()} after {<span class=doctag>@link</span> #stop()}</span></span><br><span class=line><span class=comment> * completes.</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>interface</span> <span class="title class_">SingleUse</span> {</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>对应的就是 Lifecycle 的状态，可以在 LifecycleState 中看到，这个枚举有两个字段组成，available 表示该状态下这个对应的组件状态是否可用，另一个就是对应的事件，比如 INITIALIZING 这个 state 对应的 BEFORE_INIT_EVENT<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>enum</span> <span class="title class_">LifecycleState</span> {</span><br><span class=line> NEW(<span class=literal>false</span>, <span class=literal>null</span>),</span><br><span class=line> INITIALIZING(<span class=literal>false</span>, Lifecycle.BEFORE_INIT_EVENT),</span><br><span class=line> INITIALIZED(<span class=literal>false</span>, Lifecycle.AFTER_INIT_EVENT),</span><br><span class=line> STARTING_PREP(<span class=literal>false</span>, Lifecycle.BEFORE_START_EVENT),</span><br><span class=line> STARTING(<span class=literal>true</span>, Lifecycle.START_EVENT),</span><br><span class=line> STARTED(<span class=literal>true</span>, Lifecycle.AFTER_START_EVENT),</span><br><span class=line> STOPPING_PREP(<span class=literal>true</span>, Lifecycle.BEFORE_STOP_EVENT),</span><br><span class=line> STOPPING(<span class=literal>false</span>, Lifecycle.STOP_EVENT),</span><br><span class=line> STOPPED(<span class=literal>false</span>, Lifecycle.AFTER_STOP_EVENT),</span><br><span class=line> DESTROYING(<span class=literal>false</span>, Lifecycle.BEFORE_DESTROY_EVENT),</span><br><span class=line> DESTROYED(<span class=literal>false</span>, Lifecycle.AFTER_DESTROY_EVENT),</span><br><span class=line> FAILED(<span class=literal>false</span>, <span class=literal>null</span>);</span><br><span class=line></span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> <span class=type>boolean</span> available;</span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> String lifecycleEvent;</span><br><span class=line></span><br><span class=line> <span class=keyword>private</span> <span class="title function_">LifecycleState</span><span class=params>(<span class=type>boolean</span> available, String lifecycleEvent)</span> {</span><br><span class=line> <span class=built_in>this</span>.available = available;</span><br><span class=line> <span class=built_in>this</span>.lifecycleEvent = lifecycleEvent;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>/**</span></span><br><span class=line><span class=comment> * May the public methods other than property getters/setters and lifecycle</span></span><br><span class=line><span class=comment> * methods be called for a component in this state? It returns</span></span><br><span class=line><span class=comment> * <code>true</code> for any component in any of the following states:</span></span><br><span class=line><span class=comment> * <ul></span></span><br><span class=line><span class=comment> * <li>{<span class=doctag>@link</span> #STARTING}</li></span></span><br><span class=line><span class=comment> * <li>{<span class=doctag>@link</span> #STARTED}</li></span></span><br><span class=line><span class=comment> * <li>{<span class=doctag>@link</span> #STOPPING_PREP}</li></span></span><br><span class=line><span class=comment> * </ul></span></span><br><span class=line><span class=comment> *</span></span><br><span class=line><span class=comment> * <span class=doctag>@return</span> <code>true</code> if the component is available for use,</span></span><br><span class=line><span class=comment> * otherwise <code>false</code></span></span><br><span class=line><span class=comment> */</span></span><br><span class=line> <span class=keyword>public</span> <span class=type>boolean</span> <span class="title function_">isAvailable</span><span class=params>()</span> {</span><br><span class=line> <span class=keyword>return</span> available;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> String <span class="title function_">getLifecycleEvent</span><span class=params>()</span> {</span><br><span class=line> <span class=keyword>return</span> lifecycleEvent;</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>然后可以看看 Lifecycle 的状态流转示意，下面是从 Lifecycle 的代码注释里拷出来的<blockquote><p>Common interface for component life cycle methods. Catalina components may implement this interface (as well as the appropriate interface(s) for the functionality they support) in order to provide a consistent mechanism to start and stop the component. The valid state transitions for components that support Lifecycle are:</blockquote><figure class="highlight shell"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br></pre><td class=code><pre><span class=line> start()</span><br><span class=line> -----------------------------</span><br><span class=line> | |</span><br><span class=line> | init() |</span><br><span class=line>NEW -»-- INITIALIZING |</span><br><span class=line>| | | | ------------------«-----------------------</span><br><span class=line>| | |auto | | |</span><br><span class=line>| | \|/ start() \|/ \|/ auto auto stop() |</span><br><span class=line>| | INITIALIZED --»-- STARTING_PREP --»- STARTING --»- STARTED --»--- |</span><br><span class=line>| | | | |</span><br><span class=line>| |destroy()| | |</span><br><span class=line>| --»-----«-- ------------------------«-------------------------------- ^</span><br><span class=line>| | | |</span><br><span class=line>| | \|/ auto auto start() |</span><br><span class=line>| | STOPPING_PREP ----»---- STOPPING ------»----- STOPPED -----»-----</span><br><span class=line>| \|/ ^ | ^</span><br><span class=line>| | stop() | | |</span><br><span class=line>| | -------------------------- | |</span><br><span class=line>| | | | |</span><br><span class=line>| | | destroy() destroy() | |</span><br><span class=line>| | FAILED ----»------ DESTROYING ---«----------------- |</span><br><span class=line>| | ^ | |</span><br><span class=line>| | destroy() | |auto |</span><br><span class=line>| --------»----------------- \|/ |</span><br><span class=line>| DESTROYED |</span><br><span class=line>| |</span><br><span class=line>| stop() |</span><br><span class=line>----»-----------------------------»------------------------------</span><br></pre></table></figure><p>Any state can transition to FAILED.<p>Calling start() while a component is in states STARTING_PREP, STARTING or<br>STARTED has no effect.<p>Calling start() while a component is in state NEW will cause init() to be<br>called immediately after the start() method is entered.<p>Calling stop() while a component is in states STOPPING_PREP, STOPPING or<br>STOPPED has no effect.<p>Calling stop() while a component is in state NEW transitions the component<br>to STOPPED. This is typically encountered when a component fails to start and<br>does not start all its sub-components. When the component is stopped, it will<br>try to stop all sub-components - even those it didn’t start.<p>Attempting any other transition will throw LifecycleException.<p>The LifecycleEvents fired during state changes are defined in the methods that trigger the changed. No LifecycleEvents are fired if the attempted transition is not valid.<br>好的项目就是会把这样的示意图画得很好，把状态流转都画得很明确，而不一定要什么好看的作图工具，用字符就可以<br>而在 LifecycleBase类中是把更细节的实现了，<br>init方法就是先判断了状态<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>final</span> <span class=keyword>synchronized</span> <span class=keyword>void</span> <span class="title function_">init</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException {</span><br><span class=line> <span class=keyword>if</span> (!state.equals(LifecycleState.NEW)) {</span><br><span class=line> <span class=comment>// 只有状态是 new 才可以执行初始化 init</span></span><br><span class=line> invalidTransition(Lifecycle.BEFORE_INIT_EVENT);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> setStateInternal(LifecycleState.INITIALIZING, <span class=literal>null</span>, <span class=literal>false</span>);</span><br><span class=line> initInternal();</span><br><span class=line> setStateInternal(LifecycleState.INITIALIZED, <span class=literal>null</span>, <span class=literal>false</span>);</span><br><span class=line> } <span class=keyword>catch</span> (Throwable t) {</span><br><span class=line> handleSubClassException(t, <span class=string>"lifecycleBase.initFail"</span>, toString());</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>在判断状态后就先设置了初始化中这个状态，这里设置的时候是 check 是 false 的，所以直接到设置状态，并且触发事件<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br></pre><td class=code><pre><span class=line><span class=keyword>private</span> <span class=keyword>synchronized</span> <span class=keyword>void</span> <span class="title function_">setStateInternal</span><span class=params>(LifecycleState state, Object data, <span class=type>boolean</span> check)</span></span><br><span class=line> <span class=keyword>throws</span> LifecycleException {</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (log.isDebugEnabled()) {</span><br><span class=line> log.debug(sm.getString(<span class=string>"lifecycleBase.setState"</span>, <span class=built_in>this</span>, state));</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (check) {</span><br><span class=line> <span class=comment>// Must have been triggered by one of the abstract methods (assume</span></span><br><span class=line> <span class=comment>// code in this class is correct)</span></span><br><span class=line> <span class=comment>// null is never a valid state</span></span><br><span class=line> <span class=keyword>if</span> (state == <span class=literal>null</span>) {</span><br><span class=line> invalidTransition(<span class=string>"null"</span>);</span><br><span class=line> <span class=comment>// Unreachable code - here to stop eclipse complaining about</span></span><br><span class=line> <span class=comment>// a possible NPE further down the method</span></span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Any method can transition to failed</span></span><br><span class=line> <span class=comment>// startInternal() permits STARTING_PREP to STARTING</span></span><br><span class=line> <span class=comment>// stopInternal() permits STOPPING_PREP to STOPPING and FAILED to</span></span><br><span class=line> <span class=comment>// STOPPING</span></span><br><span class=line> <span class=keyword>if</span> (!(state == LifecycleState.FAILED ||</span><br><span class=line> (<span class=built_in>this</span>.state == LifecycleState.STARTING_PREP &&</span><br><span class=line> state == LifecycleState.STARTING) ||</span><br><span class=line> (<span class=built_in>this</span>.state == LifecycleState.STOPPING_PREP &&</span><br><span class=line> state == LifecycleState.STOPPING) ||</span><br><span class=line> (<span class=built_in>this</span>.state == LifecycleState.FAILED &&</span><br><span class=line> state == LifecycleState.STOPPING))) {</span><br><span class=line> <span class=comment>// No other transition permitted</span></span><br><span class=line> invalidTransition(state.name());</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=built_in>this</span>.state = state;</span><br><span class=line> <span class=type>String</span> <span class=variable>lifecycleEvent</span> <span class=operator>=</span> state.getLifecycleEvent();</span><br><span class=line> <span class=keyword>if</span> (lifecycleEvent != <span class=literal>null</span>) {</span><br><span class=line> fireLifecycleEvent(lifecycleEvent, data);</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>触发事件调用了 fireLifecycleEvent<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br></pre><td class=code><pre><span class=line><span class=keyword>protected</span> <span class=keyword>void</span> <span class="title function_">fireLifecycleEvent</span><span class=params>(String type, Object data)</span> {</span><br><span class=line> <span class=type>LifecycleEvent</span> <span class=variable>event</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">LifecycleEvent</span>(<span class=built_in>this</span>, type, data);</span><br><span class=line> <span class=keyword>for</span> (LifecycleListener listener : lifecycleListeners) {</span><br><span class=line> listener.lifecycleEvent(event);</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>会调用所有的 listener 将事件发送出去<br>而回到上面 init 方法，第二步的 initInternal 就是 Tomcat 的 Lifecycle 中非常核心的一点了<br>因为上面说到很多组件都是继承了 LifecycleBase 的，实际外部被调用的其实都是 LifecycleBase 的<br>init，start 等方法，内部是由这个抽象基类去设置前后的状态，以及调用 initInternal ，也就是具体<br>实现类的实现方法，譬如 connector 的 initInternal 方法，就是真正处理初始化逻辑的<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>protected</span> <span class=keyword>void</span> <span class="title function_">initInternal</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException {</span><br><span class=line></span><br><span class=line> <span class=built_in>super</span>.initInternal();</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (protocolHandler == <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(</span><br><span class=line> sm.getString(<span class=string>"coyoteConnector.protocolHandlerInstantiationFailed"</span>));</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Initialize adapter</span></span><br><span class=line> adapter = <span class=keyword>new</span> <span class="title class_">CoyoteAdapter</span>(<span class=built_in>this</span>);</span><br><span class=line> protocolHandler.setAdapter(adapter);</span><br><span class=line> <span class=keyword>if</span> (service != <span class=literal>null</span>) {</span><br><span class=line> protocolHandler.setUtilityExecutor(service.getServer().getUtilityExecutor());</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Make sure parseBodyMethodsSet has a default</span></span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == parseBodyMethodsSet) {</span><br><span class=line> setParseBodyMethods(getParseBodyMethods());</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (protocolHandler.isAprRequired() && !AprStatus.isInstanceCreated()) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(sm.getString(<span class=string>"coyoteConnector.protocolHandlerNoAprListener"</span>,</span><br><span class=line> getProtocolHandlerClassName()));</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (protocolHandler.isAprRequired() && !AprStatus.isAprAvailable()) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(sm.getString(<span class=string>"coyoteConnector.protocolHandlerNoAprLibrary"</span>,</span><br><span class=line> getProtocolHandlerClassName()));</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (AprStatus.isAprAvailable() && AprStatus.getUseOpenSSL() &&</span><br><span class=line> protocolHandler <span class=keyword>instanceof</span> AbstractHttp11JsseProtocol) {</span><br><span class=line> AbstractHttp11JsseProtocol<?> jsseProtocolHandler =</span><br><span class=line> (AbstractHttp11JsseProtocol<?>) protocolHandler;</span><br><span class=line> <span class=keyword>if</span> (jsseProtocolHandler.isSSLEnabled() &&</span><br><span class=line> jsseProtocolHandler.getSslImplementationName() == <span class=literal>null</span>) {</span><br><span class=line> <span class=comment>// OpenSSL is compatible with the JSSE configuration, so use it if APR is available</span></span><br><span class=line> jsseProtocolHandler.setSslImplementationName(OpenSSLImplementation.class.getName());</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> protocolHandler.init();</span><br><span class=line> } <span class=keyword>catch</span> (Exception e) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(</span><br><span class=line> sm.getString(<span class=string>"coyoteConnector.protocolHandlerInitializationFailed"</span>), e);</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>start 方法也是类似的，但是更复杂，第一步也是状态判断，是不是已经被启动过了，如果还是 new 状态的话就先调用 init，如果已经 failed 启动失败了就直接调用 stop 结束了，如果是非已初始化和非已停止的状态则是错误的状态转变<br>如果是正常情况，那就是先设置成 STARTING_PREP，然后调用实现类的 startInternal，如果启动失败了就调用 stop，此时理论上应该是启动中 STARTING 状态，否则就是异常状态转变，剩下的就是状态启动完的状态，<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>final</span> <span class=keyword>synchronized</span> <span class=keyword>void</span> <span class="title function_">start</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException {</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (LifecycleState.STARTING_PREP.equals(state) || LifecycleState.STARTING.equals(state) ||</span><br><span class=line> LifecycleState.STARTED.equals(state)) {</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (log.isDebugEnabled()) {</span><br><span class=line> <span class=type>Exception</span> <span class=variable>e</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>();</span><br><span class=line> log.debug(sm.getString(<span class=string>"lifecycleBase.alreadyStarted"</span>, toString()), e);</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (log.isInfoEnabled()) {</span><br><span class=line> log.info(sm.getString(<span class=string>"lifecycleBase.alreadyStarted"</span>, toString()));</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (state.equals(LifecycleState.NEW)) {</span><br><span class=line> init();</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (state.equals(LifecycleState.FAILED)) {</span><br><span class=line> stop();</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (!state.equals(LifecycleState.INITIALIZED) &&</span><br><span class=line> !state.equals(LifecycleState.STOPPED)) {</span><br><span class=line> invalidTransition(Lifecycle.BEFORE_START_EVENT);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> setStateInternal(LifecycleState.STARTING_PREP, <span class=literal>null</span>, <span class=literal>false</span>);</span><br><span class=line> startInternal();</span><br><span class=line> <span class=keyword>if</span> (state.equals(LifecycleState.FAILED)) {</span><br><span class=line> <span class=comment>// This is a 'controlled' failure. The component put itself into the</span></span><br><span class=line> <span class=comment>// FAILED state so call stop() to complete the clean-up.</span></span><br><span class=line> stop();</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (!state.equals(LifecycleState.STARTING)) {</span><br><span class=line> <span class=comment>// Shouldn't be necessary but acts as a check that sub-classes are</span></span><br><span class=line> <span class=comment>// doing what they are supposed to.</span></span><br><span class=line> invalidTransition(Lifecycle.AFTER_START_EVENT);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> setStateInternal(LifecycleState.STARTED, <span class=literal>null</span>, <span class=literal>false</span>);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (Throwable t) {</span><br><span class=line> <span class=comment>// This is an 'uncontrolled' failure so put the component into the</span></span><br><span class=line> <span class=comment>// FAILED state and throw an exception.</span></span><br><span class=line> handleSubClassException(t, <span class=string>"lifecycleBase.startFail"</span>, toString());</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>stop 跟 destroy 也类似的</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/2023/10/15/%E8%81%8A%E8%81%8A%E5%AF%B9-FunctionalInterface-%E6%B3%A8%E8%A7%A3%E7%9A%84%E4%B8%80%E4%BA%9B%E7%90%86%E8%A7%A3/ 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=/2023/10/15/%E8%81%8A%E8%81%8A%E5%AF%B9-FunctionalInterface-%E6%B3%A8%E8%A7%A3%E7%9A%84%E4%B8%80%E4%BA%9B%E7%90%86%E8%A7%A3/ itemprop=url>聊聊对 FunctionalInterface 注解的一些理解</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：2023-10-15 20:13:42 / 修改时间：20:14:55" datetime=2023-10-15T20:13:42+08:00>2023-10-15</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><span class="post-meta-item leancloud_visitors" data-flag-title="聊聊对 FunctionalInterface 注解的一些理解" id=/2023/10/15/%E8%81%8A%E8%81%8A%E5%AF%B9-FunctionalInterface-%E6%B3%A8%E8%A7%A3%E7%9A%84%E4%B8%80%E4%BA%9B%E7%90%86%E8%A7%A3/ 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=/2023/10/15/%E8%81%8A%E8%81%8A%E5%AF%B9-FunctionalInterface-%E6%B3%A8%E8%A7%A3%E7%9A%84%E4%B8%80%E4%BA%9B%E7%90%86%E8%A7%A3/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/10/15/聊聊对-FunctionalInterface-注解的一些理解/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>在看 Tomcat 代码过程中碰到了一个小问题，可以用代码来举例讲一下<br>先定义一个简单的接口<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br></pre><td class=code><pre><span class=line><span class=meta>@FunctionalInterface</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>interface</span> <span class="title class_">FunctionalInterfaceTest</span> {</span><br><span class=line></span><br><span class=line> String <span class="title function_">getInfo</span><span class=params>()</span>;</span><br><span class=line>}</span><br></pre></table></figure><p>functionalInterface本质还是个接口，所以可以用类实现接口的方式<br>比如像这样<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>class</span> <span class="title class_">FunctionalInterfaceImpl</span> <span class=keyword>implements</span> <span class="title class_">FunctionalInterfaceTest</span>{</span><br><span class=line> <span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> String <span class="title function_">getInfo</span><span class=params>()</span> {</span><br><span class=line> <span class=keyword>return</span> <span class=string>"info"</span>;</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>但是有下面另外两种方式也是可以实现接口的<br>第一种是 lambda，<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br></pre><td class=code><pre><span class=line><span class=type>FunctionalInterfaceTest</span> <span class=variable>interfaceTest</span> <span class=operator>=</span> () -> <span class=string>"aaa"</span>;</span><br><span class=line>System.out.println(interfaceTest.getInfo());</span><br></pre></table></figure><p>这个实现方式就是直接把 lambda 表达式作为接口实现，但是如果这样就要注意如果实在代码中间的话，debug 还是会跳到这个 lambda 的实现，有时候会混乱，因为只是跳转到 lambda 表达式，而不是所在的方法<br>第二种是这样<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>void</span> <span class="title function_">main</span><span class=params>(String[] args)</span> {</span><br><span class=line> <span class=type>FunctionalInterfaceTest</span> <span class=variable>interfaceTest1</span> <span class=operator>=</span> demo.getSelfInfo();</span><br><span class=line> System.out.println(interfaceTest.getInfo());</span><br><span class=line>}</span><br><span class=line></span><br><span class=line><span class=keyword>public</span> FunctionalInterfaceTest <span class="title function_">getSelfInfo</span><span class=params>()</span> {</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>::info;</span><br><span class=line>}</span><br><span class=line></span><br><span class=line><span class=keyword>public</span> String <span class="title function_">info</span><span class=params>()</span> {</span><br><span class=line> <span class=keyword>return</span> <span class=string>"ccc"</span>;</span><br><span class=line>}</span><br></pre></table></figure><p>前面 <code>getSelfInfo</code> 的返回值就是类里的一个方法，可以用来作为 FunctionalInterface 的实现，这里跟上面有个比较奇怪的，或者说对于常规的接口理解，一般来说实现的方法签名必须和接口的方法签名一致，但是对于函数接口，私域就突破了这个限制，不管是lambda 这种匿名函数或者后面这种方法引用，都没有用 <code>getInfo</code> 这个方法名，这也是一个比较最近的一个理解。</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/2023/10/07/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%9B%9B-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Service-%E5%90%AF%E5%8A%A8%E8%BF%87%E7%A8%8B/ 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=/2023/10/07/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%9B%9B-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Service-%E5%90%AF%E5%8A%A8%E8%BF%87%E7%A8%8B/ itemprop=url>Tomcat 系列篇五-介绍下 Service 启动过程</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：2023-10-07 16:03:56 / 修改时间：16:04:46" datetime=2023-10-07T16:03:56+08:00>2023-10-07</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 itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/SpringBoot/Tomcat/ itemprop=url rel=index><span itemprop=name>Tomcat</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="Tomcat 系列篇五-介绍下 Service 启动过程" id=/2023/10/07/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%9B%9B-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Service-%E5%90%AF%E5%8A%A8%E8%BF%87%E7%A8%8B/ 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=/2023/10/07/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%9B%9B-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Service-%E5%90%AF%E5%8A%A8%E8%BF%87%E7%A8%8B/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/10/07/Tomcat-系列篇四-介绍下-Service-启动过程/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>这里开始介绍下 Service 的启动过程，Tomcat 的启动过程中<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">start</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException {</span><br><span class=line> getServer();</span><br><span class=line> server.start();</span><br><span class=line>}</span><br></pre></table></figure><p>getServer之前讲到过<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> Server <span class="title function_">getServer</span><span class=params>()</span> {</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (server != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>return</span> server;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> System.setProperty(<span class=string>"catalina.useNaming"</span>, <span class=string>"false"</span>);</span><br><span class=line></span><br><span class=line> server = <span class=keyword>new</span> <span class="title class_">StandardServer</span>();</span><br><span class=line></span><br><span class=line> initBaseDir();</span><br><span class=line></span><br><span class=line> <span class=comment>// Set configuration source</span></span><br><span class=line> ConfigFileLoader.setSource(<span class=keyword>new</span> <span class="title class_">CatalinaBaseConfigurationSource</span>(<span class=keyword>new</span> <span class="title class_">File</span>(basedir), <span class=literal>null</span>));</span><br><span class=line></span><br><span class=line> server.setPort( -<span class=number>1</span> );</span><br><span class=line></span><br><span class=line> <span class=type>Service</span> <span class=variable>service</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">StandardService</span>();</span><br><span class=line> service.setName(<span class=string>"Tomcat"</span>);</span><br><span class=line> server.addService(service);</span><br><span class=line> <span class=keyword>return</span> server;</span><br><span class=line>}</span><br></pre></table></figure><p>会 new 一个StandardService，添加到 server 里，然后进行启动<br>而这个外面的 server.start 其实调用的是 <code>org.apache.catalina.Lifecycle#start</code>,<br>里面是一个 Lifecycle 的接口，这个接口被很多 Tomcat 的组件实现，其实都共用了 Lifecycle 的机制<br>然后 Lifecycle 里面会根据状态，调用实际的实现层的 startInternal 方法<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>protected</span> <span class=keyword>void</span> <span class="title function_">startInternal</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException {</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span>(log.isInfoEnabled()) {</span><br><span class=line> log.info(sm.getString(<span class=string>"standardService.start.name"</span>, <span class=built_in>this</span>.name));</span><br><span class=line> }</span><br><span class=line> setState(LifecycleState.STARTING);</span><br><span class=line></span><br><span class=line> <span class=comment>// Start our defined Container first</span></span><br><span class=line> <span class=keyword>if</span> (engine != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>synchronized</span> (engine) {</span><br><span class=line> engine.start();</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>synchronized</span> (executors) {</span><br><span class=line> <span class=keyword>for</span> (Executor executor: executors) {</span><br><span class=line> executor.start();</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> mapperListener.start();</span><br><span class=line></span><br><span class=line> <span class=comment>// Start our defined Connectors second</span></span><br><span class=line> <span class=keyword>synchronized</span> (connectorsLock) {</span><br><span class=line> <span class=keyword>for</span> (Connector connector: connectors) {</span><br><span class=line> <span class=comment>// If it has already failed, don't try and start it</span></span><br><span class=line> <span class=keyword>if</span> (connector.getState() != LifecycleState.FAILED) {</span><br><span class=line> connector.start();</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>这里会先设置状态，这个状态也有点东西，可以后面再讲，因为里面有个状态事件的触发<br>然后是启动 Engine，也就是 container，在这里就是 StandardEngine，先不深入去讲里面做了啥，后面讲 StandardEngine 的启动过程会讲，然后是启动线程池了，对于 StandardService 是没有线程池要启动的，或者是 springboot 集成的这个 Tomcat 中不需要，接着就是 mapperListener 的启动，这里其实是给 container 这种添加 listener，用来监听事件，做处理<br>然后就是启动 connector，connector 的启动就是之前说的，里面会启动 protocolHandler，这里还是一样的通过 Lifecycle 的接口，再通过 Lifecycle 的模板方法调用实际的 connector 实现 startInternal 方法，这也是 Tomcat 的一大特点，关于 Tomcat 也是个很大的课题，后面可能还会调整下组织结构，对新同学更友好一点。<br>值得注意的还有两个<br>第一个是添加 connector，先是锁一下，设置 connector 的 Service，然后 connectors 是个数组，这里进行了重新申请一个数组，然后进行拷贝，再把新添加的放到数组最后，<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">addConnector</span><span class=params>(Connector connector)</span> {</span><br><span class=line></span><br><span class=line> <span class=keyword>synchronized</span> (connectorsLock) {</span><br><span class=line> connector.setService(<span class=built_in>this</span>);</span><br><span class=line> Connector results[] = <span class=keyword>new</span> <span class="title class_">Connector</span>[connectors.length + <span class=number>1</span>];</span><br><span class=line> System.arraycopy(connectors, <span class=number>0</span>, results, <span class=number>0</span>, connectors.length);</span><br><span class=line> results[connectors.length] = connector;</span><br><span class=line> connectors = results;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>if</span> (getState().isAvailable()) {</span><br><span class=line> connector.start();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (LifecycleException e) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">IllegalArgumentException</span>(</span><br><span class=line> sm.getString(<span class=string>"standardService.connector.startFailed"</span>, connector), e);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Report this property change to interested listeners</span></span><br><span class=line> support.firePropertyChange(<span class=string>"connector"</span>, <span class=literal>null</span>, connector);</span><br><span class=line>}</span><br></pre></table></figure><p>然后是判断当前的状态是否可用，如果可用就启动 connector, 最后触发下 connector 的变更事件<br>还有一个是设置Engine，<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br></pre><td class=code><pre><span class=line></span><br><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">setContainer</span><span class=params>(Engine engine)</span> {</span><br><span class=line> <span class=type>Engine</span> <span class=variable>oldEngine</span> <span class=operator>=</span> <span class=built_in>this</span>.engine;</span><br><span class=line> <span class=keyword>if</span> (oldEngine != <span class=literal>null</span>) {</span><br><span class=line> oldEngine.setService(<span class=literal>null</span>);</span><br><span class=line> }</span><br><span class=line> <span class=built_in>this</span>.engine = engine;</span><br><span class=line> <span class=keyword>if</span> (<span class=built_in>this</span>.engine != <span class=literal>null</span>) {</span><br><span class=line> <span class=built_in>this</span>.engine.setService(<span class=built_in>this</span>);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (getState().isAvailable()) {</span><br><span class=line> <span class=keyword>if</span> (<span class=built_in>this</span>.engine != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=built_in>this</span>.engine.start();</span><br><span class=line> } <span class=keyword>catch</span> (LifecycleException e) {</span><br><span class=line> log.error(sm.getString(<span class=string>"standardService.engine.startFailed"</span>), e);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> <span class=comment>// Restart MapperListener to pick up new engine.</span></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> mapperListener.stop();</span><br><span class=line> } <span class=keyword>catch</span> (LifecycleException e) {</span><br><span class=line> log.error(sm.getString(<span class=string>"standardService.mapperListener.stopFailed"</span>), e);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> mapperListener.start();</span><br><span class=line> } <span class=keyword>catch</span> (LifecycleException e) {</span><br><span class=line> log.error(sm.getString(<span class=string>"standardService.mapperListener.startFailed"</span>), e);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (oldEngine != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> oldEngine.stop();</span><br><span class=line> } <span class=keyword>catch</span> (LifecycleException e) {</span><br><span class=line> log.error(sm.getString(<span class=string>"standardService.engine.stopFailed"</span>), e);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Report this property change to interested listeners</span></span><br><span class=line> support.firePropertyChange(<span class=string>"container"</span>, oldEngine, <span class=built_in>this</span>.engine);</span><br><span class=line>}</span><br></pre></table></figure><p>前面两步是把第一个的 engine 的 service 设置为 null，然后第二个 engine 也就是新的这个的 service 设置成当前的 service，然后也是判断状态，启动 engine，接着是重启 mapperListener，先关闭再启动，最后是关闭老的 engine，最后的最后就是触发 container 变更事件。</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/2023/10/01/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%9B%9B-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Valve-%E6%9E%B6%E6%9E%84/ 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=/2023/10/01/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%9B%9B-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Valve-%E6%9E%B6%E6%9E%84/ itemprop=url>Tomcat 系列篇四-介绍下 Valve 架构</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：2023-10-01 19:54:06" datetime=2023-10-01T19:54:06+08:00>2023-10-01</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：2025-10-12 20:06:06" datetime=2025-10-12T20:06:06+08:00 itemprop=dateModified>2025-10-12</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>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 itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/SpringBoot/Tomcat/ itemprop=url rel=index><span itemprop=name>Tomcat</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="Tomcat 系列篇四-介绍下 Valve 架构" id=/2023/10/01/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%9B%9B-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Valve-%E6%9E%B6%E6%9E%84/ 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=/2023/10/01/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%9B%9B-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Valve-%E6%9E%B6%E6%9E%84/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/10/01/Tomcat-系列篇四-介绍下-Valve-架构/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>valve 是 Tomcat 架构中比较重要的一个组成部分，<br>之前说到<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br></pre><td class=code><pre><span class=line>connector.getService().getContainer().getPipeline().getFirst().invoke(</span><br><span class=line> request, response);</span><br></pre></table></figure><p>这段代码是通过 CoyoteAdapter 将请求处理往 container 传，这里就有个 pipeline 机制，这个 pipeline 可以看一下接口<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>interface</span> <span class="title class_">Pipeline</span> <span class=keyword>extends</span> <span class="title class_">Contained</span> {</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> Valve <span class="title function_">getBasic</span><span class=params>()</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">setBasic</span><span class=params>(Valve valve)</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">addValve</span><span class=params>(Valve valve)</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> Valve[] getValves();</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">removeValve</span><span class=params>(Valve valve)</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> Valve <span class="title function_">getFirst</span><span class=params>()</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=type>boolean</span> <span class="title function_">isAsyncSupported</span><span class=params>()</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">findNonAsyncValves</span><span class=params>(Set<String> result)</span>;</span><br><span class=line>}</span><br></pre></table></figure><p>这里可以往 pipeline 里添加 valve，然后看下 valve 的接口<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>interface</span> <span class="title class_">Valve</span> {</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> Valve <span class="title function_">getNext</span><span class=params>()</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">setNext</span><span class=params>(Valve valve)</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">backgroundProcess</span><span class=params>()</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">invoke</span><span class=params>(Request request, Response response)</span></span><br><span class=line> <span class=keyword>throws</span> IOException, ServletException;</span><br><span class=line></span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=type>boolean</span> <span class="title function_">isAsyncSupported</span><span class=params>()</span>;</span><br><span class=line>}</span><br></pre></table></figure><p>这里主要看的就是 getNext 跟 setNext，就变成了一个有序的 pipeline，然后就是 invoke 方法，其实 pipeline 是由两部分组成，valve 在其中起到了前后衔接的重要作用，而且可以再 invoke 中进一步串联调用<br><img data-src=https://img.nicksxs.me/blog/Ttnmpu.png><br>图中我们可以看到，对于 container 这个 pipeline，是没设置 first 的，只有 basic，basic 就是个兜底的 valve，在 StandardPipeline 中的 getFirst 实现<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> Valve <span class="title function_">getFirst</span><span class=params>()</span> {</span><br><span class=line> <span class=keyword>if</span> (first != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>return</span> first;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>return</span> basic;</span><br><span class=line>}</span><br></pre></table></figure><p>取不到 first 就降级到 basic，也就是这里的 <code>StandardEngineValve</code>，<br>它的 invoke 我们来看下<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>final</span> <span class=keyword>void</span> <span class="title function_">invoke</span><span class=params>(Request request, Response response)</span></span><br><span class=line> <span class=keyword>throws</span> IOException, ServletException {</span><br><span class=line></span><br><span class=line> <span class=comment>// Select the Host to be used for this Request</span></span><br><span class=line> <span class=type>Host</span> <span class=variable>host</span> <span class=operator>=</span> request.getHost();</span><br><span class=line> <span class=keyword>if</span> (host == <span class=literal>null</span>) {</span><br><span class=line> <span class=comment>// HTTP 0.9 or HTTP 1.0 request without a host when no default host</span></span><br><span class=line> <span class=comment>// is defined.</span></span><br><span class=line> <span class=comment>// Don't overwrite an existing error</span></span><br><span class=line> <span class=keyword>if</span> (!response.isError()) {</span><br><span class=line> response.sendError(<span class=number>404</span>);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (request.isAsyncSupported()) {</span><br><span class=line> request.setAsyncSupported(host.getPipeline().isAsyncSupported());</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Ask this Host to process this request</span></span><br><span class=line> host.getPipeline().getFirst().invoke(request, response);</span><br><span class=line>}</span><br></pre></table></figure><p>比较简单，就是调用 host 中的 pipeline 里的第一个 valve 来处理<br><img data-src=https://img.nicksxs.me/blog/TOBldQ.png><br>第一个是 org.apache.catalina.valves.ErrorReportValve，<br>这里处理的其实是先调用了 next<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br><span class=line>59</span><br><span class=line>60</span><br><span class=line>61</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">invoke</span><span class=params>(Request request, Response response)</span> <span class=keyword>throws</span> IOException, ServletException {</span><br><span class=line></span><br><span class=line> <span class=comment>// Perform the request</span></span><br><span class=line> getNext().invoke(request, response);</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (response.isCommitted()) {</span><br><span class=line> <span class=keyword>if</span> (response.setErrorReported()) {</span><br><span class=line> <span class=comment>// Error wasn't previously reported but we can't write an error</span></span><br><span class=line> <span class=comment>// page because the response has already been committed.</span></span><br><span class=line></span><br><span class=line> <span class=comment>// See if IO is allowed</span></span><br><span class=line> <span class=type>AtomicBoolean</span> <span class=variable>ioAllowed</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">AtomicBoolean</span>(<span class=literal>true</span>);</span><br><span class=line> response.getCoyoteResponse().action(ActionCode.IS_IO_ALLOWED, ioAllowed);</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (ioAllowed.get()) {</span><br><span class=line> <span class=comment>// I/O is currently still allowed. Flush any data that is</span></span><br><span class=line> <span class=comment>// still to be written to the client.</span></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> response.flushBuffer();</span><br><span class=line> } <span class=keyword>catch</span> (Throwable t) {</span><br><span class=line> ExceptionUtils.handleThrowable(t);</span><br><span class=line> }</span><br><span class=line> <span class=comment>// Now close immediately to signal to the client that</span></span><br><span class=line> <span class=comment>// something went wrong</span></span><br><span class=line> response.getCoyoteResponse().action(ActionCode.CLOSE_NOW,</span><br><span class=line> request.getAttribute(RequestDispatcher.ERROR_EXCEPTION));</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>Throwable</span> <span class=variable>throwable</span> <span class=operator>=</span> (Throwable) request.getAttribute(RequestDispatcher.ERROR_EXCEPTION);</span><br><span class=line></span><br><span class=line> <span class=comment>// If an async request is in progress and is not going to end once this</span></span><br><span class=line> <span class=comment>// container thread finishes, do not process any error page here.</span></span><br><span class=line> <span class=keyword>if</span> (request.isAsync() && !request.isAsyncCompleting()) {</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (throwable != <span class=literal>null</span> && !response.isError()) {</span><br><span class=line> <span class=comment>// Make sure that the necessary methods have been called on the</span></span><br><span class=line> <span class=comment>// response. (It is possible a component may just have set the</span></span><br><span class=line> <span class=comment>// Throwable. Tomcat won't do that but other components might.)</span></span><br><span class=line> <span class=comment>// These are safe to call at this point as we know that the response</span></span><br><span class=line> <span class=comment>// has not been committed.</span></span><br><span class=line> response.reset();</span><br><span class=line> response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// One way or another, response.sendError() will have been called before</span></span><br><span class=line> <span class=comment>// execution reaches this point and suspended the response. Need to</span></span><br><span class=line> <span class=comment>// reverse that so this valve can write to the response.</span></span><br><span class=line> response.setSuspended(<span class=literal>false</span>);</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> report(request, response, throwable);</span><br><span class=line> } <span class=keyword>catch</span> (Throwable tt) {</span><br><span class=line> ExceptionUtils.handleThrowable(tt);</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>虽然是放在 first，实际是先调用 next 的 invoke，也就是 <code>org.apache.catalina.core.StandardHostValve</code> 的invoke 方法<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br><span class=line>59</span><br><span class=line>60</span><br><span class=line>61</span><br><span class=line>62</span><br><span class=line>63</span><br><span class=line>64</span><br><span class=line>65</span><br><span class=line>66</span><br><span class=line>67</span><br><span class=line>68</span><br><span class=line>69</span><br><span class=line>70</span><br><span class=line>71</span><br><span class=line>72</span><br><span class=line>73</span><br><span class=line>74</span><br><span class=line>75</span><br><span class=line>76</span><br><span class=line>77</span><br><span class=line>78</span><br><span class=line>79</span><br><span class=line>80</span><br><span class=line>81</span><br><span class=line>82</span><br><span class=line>83</span><br><span class=line>84</span><br><span class=line>85</span><br><span class=line>86</span><br><span class=line>87</span><br><span class=line>88</span><br><span class=line>89</span><br><span class=line>90</span><br><span class=line>91</span><br><span class=line>92</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>final</span> <span class=keyword>void</span> <span class="title function_">invoke</span><span class=params>(Request request, Response response)</span></span><br><span class=line> <span class=keyword>throws</span> IOException, ServletException {</span><br><span class=line></span><br><span class=line> <span class=comment>// Select the Context to be used for this Request</span></span><br><span class=line> <span class=type>Context</span> <span class=variable>context</span> <span class=operator>=</span> request.getContext();</span><br><span class=line> <span class=keyword>if</span> (context == <span class=literal>null</span>) {</span><br><span class=line> <span class=comment>// Don't overwrite an existing error</span></span><br><span class=line> <span class=keyword>if</span> (!response.isError()) {</span><br><span class=line> response.sendError(<span class=number>404</span>);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (request.isAsyncSupported()) {</span><br><span class=line> request.setAsyncSupported(context.getPipeline().isAsyncSupported());</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>boolean</span> <span class=variable>asyncAtStart</span> <span class=operator>=</span> request.isAsync();</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> context.bind(Globals.IS_SECURITY_ENABLED, MY_CLASSLOADER);</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (!asyncAtStart && !context.fireRequestInitEvent(request.getRequest())) {</span><br><span class=line> <span class=comment>// Don't fire listeners during async processing (the listener</span></span><br><span class=line> <span class=comment>// fired for the request that called startAsync()).</span></span><br><span class=line> <span class=comment>// If a request init listener throws an exception, the request</span></span><br><span class=line> <span class=comment>// is aborted.</span></span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Ask this Context to process this request. Requests that are</span></span><br><span class=line> <span class=comment>// already in error must have been routed here to check for</span></span><br><span class=line> <span class=comment>// application defined error pages so DO NOT forward them to the the</span></span><br><span class=line> <span class=comment>// application for processing.</span></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>if</span> (!response.isErrorReportRequired()) {</span><br><span class=line> <span class=comment>// 交给 context 去处理请求了</span></span><br><span class=line> context.getPipeline().getFirst().invoke(request, response);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (Throwable t) {</span><br><span class=line> ExceptionUtils.handleThrowable(t);</span><br><span class=line> container.getLogger().error(<span class=string>"Exception Processing "</span> + request.getRequestURI(), t);</span><br><span class=line> <span class=comment>// If a new error occurred while trying to report a previous</span></span><br><span class=line> <span class=comment>// error allow the original error to be reported.</span></span><br><span class=line> <span class=keyword>if</span> (!response.isErrorReportRequired()) {</span><br><span class=line> request.setAttribute(RequestDispatcher.ERROR_EXCEPTION, t);</span><br><span class=line> throwable(request, response, t);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Now that the request/response pair is back under container</span></span><br><span class=line> <span class=comment>// control lift the suspension so that the error handling can</span></span><br><span class=line> <span class=comment>// complete and/or the container can flush any remaining data</span></span><br><span class=line> response.setSuspended(<span class=literal>false</span>);</span><br><span class=line></span><br><span class=line> <span class=type>Throwable</span> <span class=variable>t</span> <span class=operator>=</span> (Throwable) request.getAttribute(RequestDispatcher.ERROR_EXCEPTION);</span><br><span class=line></span><br><span class=line> <span class=comment>// Protect against NPEs if the context was destroyed during a</span></span><br><span class=line> <span class=comment>// long running request.</span></span><br><span class=line> <span class=keyword>if</span> (!context.getState().isAvailable()) {</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Look for (and render if found) an application level error page</span></span><br><span class=line> <span class=keyword>if</span> (response.isErrorReportRequired()) {</span><br><span class=line> <span class=comment>// If an error has occurred that prevents further I/O, don't waste time</span></span><br><span class=line> <span class=comment>// producing an error report that will never be read</span></span><br><span class=line> <span class=type>AtomicBoolean</span> <span class=variable>result</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">AtomicBoolean</span>(<span class=literal>false</span>);</span><br><span class=line> response.getCoyoteResponse().action(ActionCode.IS_IO_ALLOWED, result);</span><br><span class=line> <span class=keyword>if</span> (result.get()) {</span><br><span class=line> <span class=keyword>if</span> (t != <span class=literal>null</span>) {</span><br><span class=line> throwable(request, response, t);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> status(request, response);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (!request.isAsync() && !asyncAtStart) {</span><br><span class=line> context.fireRequestDestroyEvent(request.getRequest());</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=comment>// Access a session (if present) to update last accessed time, based</span></span><br><span class=line> <span class=comment>// on a strict interpretation of the specification</span></span><br><span class=line> <span class=keyword>if</span> (ACCESS_SESSION) {</span><br><span class=line> request.getSession(<span class=literal>false</span>);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> context.unbind(Globals.IS_SECURITY_ENABLED, MY_CLASSLOADER);</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>这里的往下就是调用 context 的 pipeline 去处理请求了, StandardContext 的 pipeline 里的 first 是<br>org.apache.catalina.authenticator.NonLoginAuthenticator，处理认证相关的，然后 basic 就是<br>org.apache.catalina.core.StandardContextValve, 这里的来看下<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>final</span> <span class=keyword>void</span> <span class="title function_">invoke</span><span class=params>(Request request, Response response)</span></span><br><span class=line> <span class=keyword>throws</span> IOException, ServletException {</span><br><span class=line></span><br><span class=line> <span class=comment>// Disallow any direct access to resources under WEB-INF or META-INF</span></span><br><span class=line> <span class=type>MessageBytes</span> <span class=variable>requestPathMB</span> <span class=operator>=</span> request.getRequestPathMB();</span><br><span class=line> <span class=keyword>if</span> ((requestPathMB.startsWithIgnoreCase(<span class=string>"/META-INF/"</span>, <span class=number>0</span>))</span><br><span class=line> || (requestPathMB.equalsIgnoreCase(<span class=string>"/META-INF"</span>))</span><br><span class=line> || (requestPathMB.startsWithIgnoreCase(<span class=string>"/WEB-INF/"</span>, <span class=number>0</span>))</span><br><span class=line> || (requestPathMB.equalsIgnoreCase(<span class=string>"/WEB-INF"</span>))) {</span><br><span class=line> response.sendError(HttpServletResponse.SC_NOT_FOUND);</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Select the Wrapper to be used for this Request</span></span><br><span class=line> <span class=type>Wrapper</span> <span class=variable>wrapper</span> <span class=operator>=</span> request.getWrapper();</span><br><span class=line> <span class=keyword>if</span> (wrapper == <span class=literal>null</span> || wrapper.isUnavailable()) {</span><br><span class=line> response.sendError(HttpServletResponse.SC_NOT_FOUND);</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Acknowledge the request</span></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> response.sendAcknowledgement(ContinueResponseTiming.IMMEDIATELY);</span><br><span class=line> } <span class=keyword>catch</span> (IOException ioe) {</span><br><span class=line> container.getLogger().error(sm.getString(</span><br><span class=line> <span class=string>"standardContextValve.acknowledgeException"</span>), ioe);</span><br><span class=line> request.setAttribute(RequestDispatcher.ERROR_EXCEPTION, ioe);</span><br><span class=line> response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (request.isAsyncSupported()) {</span><br><span class=line> request.setAsyncSupported(wrapper.getPipeline().isAsyncSupported());</span><br><span class=line> }</span><br><span class=line> wrapper.getPipeline().getFirst().invoke(request, response);</span><br><span class=line> }</span><br></pre></table></figure><p>会调用 wrapper 的 pipeline 去处理请求，这里也只有一个<br><code>org.apache.catalina.core.StandardWrapperValve</code><br>这部分的逻辑比较长，因为要串联后面的 filter 流程<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br><span class=line>59</span><br><span class=line>60</span><br><span class=line>61</span><br><span class=line>62</span><br><span class=line>63</span><br><span class=line>64</span><br><span class=line>65</span><br><span class=line>66</span><br><span class=line>67</span><br><span class=line>68</span><br><span class=line>69</span><br><span class=line>70</span><br><span class=line>71</span><br><span class=line>72</span><br><span class=line>73</span><br><span class=line>74</span><br><span class=line>75</span><br><span class=line>76</span><br><span class=line>77</span><br><span class=line>78</span><br><span class=line>79</span><br><span class=line>80</span><br><span class=line>81</span><br><span class=line>82</span><br><span class=line>83</span><br><span class=line>84</span><br><span class=line>85</span><br><span class=line>86</span><br><span class=line>87</span><br><span class=line>88</span><br><span class=line>89</span><br><span class=line>90</span><br><span class=line>91</span><br><span class=line>92</span><br><span class=line>93</span><br><span class=line>94</span><br><span class=line>95</span><br><span class=line>96</span><br><span class=line>97</span><br><span class=line>98</span><br><span class=line>99</span><br><span class=line>100</span><br><span class=line>101</span><br><span class=line>102</span><br><span class=line>103</span><br><span class=line>104</span><br><span class=line>105</span><br><span class=line>106</span><br><span class=line>107</span><br><span class=line>108</span><br><span class=line>109</span><br><span class=line>110</span><br><span class=line>111</span><br><span class=line>112</span><br><span class=line>113</span><br><span class=line>114</span><br><span class=line>115</span><br><span class=line>116</span><br><span class=line>117</span><br><span class=line>118</span><br><span class=line>119</span><br><span class=line>120</span><br><span class=line>121</span><br><span class=line>122</span><br><span class=line>123</span><br><span class=line>124</span><br><span class=line>125</span><br><span class=line>126</span><br><span class=line>127</span><br><span class=line>128</span><br><span class=line>129</span><br><span class=line>130</span><br><span class=line>131</span><br><span class=line>132</span><br><span class=line>133</span><br><span class=line>134</span><br><span class=line>135</span><br><span class=line>136</span><br><span class=line>137</span><br><span class=line>138</span><br><span class=line>139</span><br><span class=line>140</span><br><span class=line>141</span><br><span class=line>142</span><br><span class=line>143</span><br><span class=line>144</span><br><span class=line>145</span><br><span class=line>146</span><br><span class=line>147</span><br><span class=line>148</span><br><span class=line>149</span><br><span class=line>150</span><br><span class=line>151</span><br><span class=line>152</span><br><span class=line>153</span><br><span class=line>154</span><br><span class=line>155</span><br><span class=line>156</span><br><span class=line>157</span><br><span class=line>158</span><br><span class=line>159</span><br><span class=line>160</span><br><span class=line>161</span><br><span class=line>162</span><br><span class=line>163</span><br><span class=line>164</span><br><span class=line>165</span><br><span class=line>166</span><br><span class=line>167</span><br><span class=line>168</span><br><span class=line>169</span><br><span class=line>170</span><br><span class=line>171</span><br><span class=line>172</span><br><span class=line>173</span><br><span class=line>174</span><br><span class=line>175</span><br><span class=line>176</span><br><span class=line>177</span><br><span class=line>178</span><br><span class=line>179</span><br><span class=line>180</span><br><span class=line>181</span><br><span class=line>182</span><br><span class=line>183</span><br><span class=line>184</span><br><span class=line>185</span><br><span class=line>186</span><br><span class=line>187</span><br><span class=line>188</span><br><span class=line>189</span><br><span class=line>190</span><br><span class=line>191</span><br><span class=line>192</span><br><span class=line>193</span><br><span class=line>194</span><br><span class=line>195</span><br><span class=line>196</span><br><span class=line>197</span><br><span class=line>198</span><br><span class=line>199</span><br><span class=line>200</span><br><span class=line>201</span><br><span class=line>202</span><br><span class=line>203</span><br><span class=line>204</span><br><span class=line>205</span><br><span class=line>206</span><br><span class=line>207</span><br><span class=line>208</span><br><span class=line>209</span><br><span class=line>210</span><br><span class=line>211</span><br><span class=line>212</span><br><span class=line>213</span><br><span class=line>214</span><br><span class=line>215</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>final</span> <span class=keyword>void</span> <span class="title function_">invoke</span><span class=params>(Request request, Response response)</span></span><br><span class=line> <span class=keyword>throws</span> IOException, ServletException {</span><br><span class=line></span><br><span class=line> <span class=comment>// Initialize local variables we may need</span></span><br><span class=line> <span class=type>boolean</span> <span class=variable>unavailable</span> <span class=operator>=</span> <span class=literal>false</span>;</span><br><span class=line> <span class=type>Throwable</span> <span class=variable>throwable</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=comment>// This should be a Request attribute...</span></span><br><span class=line> <span class=type>long</span> t1=System.currentTimeMillis();</span><br><span class=line> requestCount.incrementAndGet();</span><br><span class=line> <span class=type>StandardWrapper</span> <span class=variable>wrapper</span> <span class=operator>=</span> (StandardWrapper) getContainer();</span><br><span class=line> <span class=type>Servlet</span> <span class=variable>servlet</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=type>Context</span> <span class=variable>context</span> <span class=operator>=</span> (Context) wrapper.getParent();</span><br><span class=line></span><br><span class=line> <span class=comment>// Check for the application being marked unavailable</span></span><br><span class=line> <span class=keyword>if</span> (!context.getState().isAvailable()) {</span><br><span class=line> response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,</span><br><span class=line> sm.getString(<span class=string>"standardContext.isUnavailable"</span>));</span><br><span class=line> unavailable = <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Check for the servlet being marked unavailable</span></span><br><span class=line> <span class=keyword>if</span> (!unavailable && wrapper.isUnavailable()) {</span><br><span class=line> container.getLogger().info(sm.getString(<span class=string>"standardWrapper.isUnavailable"</span>,</span><br><span class=line> wrapper.getName()));</span><br><span class=line> <span class=type>long</span> <span class=variable>available</span> <span class=operator>=</span> wrapper.getAvailable();</span><br><span class=line> <span class=keyword>if</span> ((available > <span class=number>0L</span>) && (available < Long.MAX_VALUE)) {</span><br><span class=line> response.setDateHeader(<span class=string>"Retry-After"</span>, available);</span><br><span class=line> response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,</span><br><span class=line> sm.getString(<span class=string>"standardWrapper.isUnavailable"</span>,</span><br><span class=line> wrapper.getName()));</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (available == Long.MAX_VALUE) {</span><br><span class=line> response.sendError(HttpServletResponse.SC_NOT_FOUND,</span><br><span class=line> sm.getString(<span class=string>"standardWrapper.notFound"</span>,</span><br><span class=line> wrapper.getName()));</span><br><span class=line> }</span><br><span class=line> unavailable = <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Allocate a servlet instance to process this request</span></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>if</span> (!unavailable) {</span><br><span class=line> servlet = wrapper.allocate();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (UnavailableException e) {</span><br><span class=line> container.getLogger().error(</span><br><span class=line> sm.getString(<span class=string>"standardWrapper.allocateException"</span>,</span><br><span class=line> wrapper.getName()), e);</span><br><span class=line> <span class=type>long</span> <span class=variable>available</span> <span class=operator>=</span> wrapper.getAvailable();</span><br><span class=line> <span class=keyword>if</span> ((available > <span class=number>0L</span>) && (available < Long.MAX_VALUE)) {</span><br><span class=line> response.setDateHeader(<span class=string>"Retry-After"</span>, available);</span><br><span class=line> response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,</span><br><span class=line> sm.getString(<span class=string>"standardWrapper.isUnavailable"</span>,</span><br><span class=line> wrapper.getName()));</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (available == Long.MAX_VALUE) {</span><br><span class=line> response.sendError(HttpServletResponse.SC_NOT_FOUND,</span><br><span class=line> sm.getString(<span class=string>"standardWrapper.notFound"</span>,</span><br><span class=line> wrapper.getName()));</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (ServletException e) {</span><br><span class=line> container.getLogger().error(sm.getString(<span class=string>"standardWrapper.allocateException"</span>,</span><br><span class=line> wrapper.getName()), StandardWrapper.getRootCause(e));</span><br><span class=line> throwable = e;</span><br><span class=line> exception(request, response, e);</span><br><span class=line> } <span class=keyword>catch</span> (Throwable e) {</span><br><span class=line> ExceptionUtils.handleThrowable(e);</span><br><span class=line> container.getLogger().error(sm.getString(<span class=string>"standardWrapper.allocateException"</span>,</span><br><span class=line> wrapper.getName()), e);</span><br><span class=line> throwable = e;</span><br><span class=line> exception(request, response, e);</span><br><span class=line> servlet = <span class=literal>null</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>MessageBytes</span> <span class=variable>requestPathMB</span> <span class=operator>=</span> request.getRequestPathMB();</span><br><span class=line> <span class=type>DispatcherType</span> <span class=variable>dispatcherType</span> <span class=operator>=</span> DispatcherType.REQUEST;</span><br><span class=line> <span class=keyword>if</span> (request.getDispatcherType()==DispatcherType.ASYNC) {</span><br><span class=line> dispatcherType = DispatcherType.ASYNC;</span><br><span class=line> }</span><br><span class=line> request.setAttribute(Globals.DISPATCHER_TYPE_ATTR,dispatcherType);</span><br><span class=line> request.setAttribute(Globals.DISPATCHER_REQUEST_PATH_ATTR,</span><br><span class=line> requestPathMB);</span><br><span class=line> <span class=comment>// Create the filter chain for this request</span></span><br><span class=line> <span class=type>ApplicationFilterChain</span> <span class=variable>filterChain</span> <span class=operator>=</span></span><br><span class=line> ApplicationFilterFactory.createFilterChain(request, wrapper, servlet);</span><br><span class=line></span><br><span class=line> <span class=comment>// Call the filter chain for this request</span></span><br><span class=line> <span class=comment>// <span class=doctag>NOTE:</span> This also calls the servlet's service() method</span></span><br><span class=line> <span class=type>Container</span> <span class=variable>container</span> <span class=operator>=</span> <span class=built_in>this</span>.container;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>if</span> ((servlet != <span class=literal>null</span>) && (filterChain != <span class=literal>null</span>)) {</span><br><span class=line> <span class=comment>// Swallow output if needed</span></span><br><span class=line> <span class=keyword>if</span> (context.getSwallowOutput()) {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> SystemLogHandler.startCapture();</span><br><span class=line> <span class=keyword>if</span> (request.isAsyncDispatching()) {</span><br><span class=line> request.getAsyncContextInternal().doInternalDispatch();</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> filterChain.doFilter(request.getRequest(),</span><br><span class=line> response.getResponse());</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=type>String</span> <span class=variable>log</span> <span class=operator>=</span> SystemLogHandler.stopCapture();</span><br><span class=line> <span class=keyword>if</span> (log != <span class=literal>null</span> && log.length() > <span class=number>0</span>) {</span><br><span class=line> context.getLogger().info(log);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> <span class=keyword>if</span> (request.isAsyncDispatching()) {</span><br><span class=line> request.getAsyncContextInternal().doInternalDispatch();</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> filterChain.doFilter</span><br><span class=line> (request.getRequest(), response.getResponse());</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (ClientAbortException | CloseNowException e) {</span><br><span class=line> <span class=keyword>if</span> (container.getLogger().isDebugEnabled()) {</span><br><span class=line> container.getLogger().debug(sm.getString(</span><br><span class=line> <span class=string>"standardWrapper.serviceException"</span>, wrapper.getName(),</span><br><span class=line> context.getName()), e);</span><br><span class=line> }</span><br><span class=line> throwable = e;</span><br><span class=line> exception(request, response, e);</span><br><span class=line> } <span class=keyword>catch</span> (IOException e) {</span><br><span class=line> container.getLogger().error(sm.getString(</span><br><span class=line> <span class=string>"standardWrapper.serviceException"</span>, wrapper.getName(),</span><br><span class=line> context.getName()), e);</span><br><span class=line> throwable = e;</span><br><span class=line> exception(request, response, e);</span><br><span class=line> } <span class=keyword>catch</span> (UnavailableException e) {</span><br><span class=line> container.getLogger().error(sm.getString(</span><br><span class=line> <span class=string>"standardWrapper.serviceException"</span>, wrapper.getName(),</span><br><span class=line> context.getName()), e);</span><br><span class=line> <span class=comment>// throwable = e;</span></span><br><span class=line> <span class=comment>// exception(request, response, e);</span></span><br><span class=line> wrapper.unavailable(e);</span><br><span class=line> <span class=type>long</span> <span class=variable>available</span> <span class=operator>=</span> wrapper.getAvailable();</span><br><span class=line> <span class=keyword>if</span> ((available > <span class=number>0L</span>) && (available < Long.MAX_VALUE)) {</span><br><span class=line> response.setDateHeader(<span class=string>"Retry-After"</span>, available);</span><br><span class=line> response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,</span><br><span class=line> sm.getString(<span class=string>"standardWrapper.isUnavailable"</span>,</span><br><span class=line> wrapper.getName()));</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (available == Long.MAX_VALUE) {</span><br><span class=line> response.sendError(HttpServletResponse.SC_NOT_FOUND,</span><br><span class=line> sm.getString(<span class=string>"standardWrapper.notFound"</span>,</span><br><span class=line> wrapper.getName()));</span><br><span class=line> }</span><br><span class=line> <span class=comment>// Do not save exception in 'throwable', because we</span></span><br><span class=line> <span class=comment>// do not want to do exception(request, response, e) processing</span></span><br><span class=line> } <span class=keyword>catch</span> (ServletException e) {</span><br><span class=line> <span class=type>Throwable</span> <span class=variable>rootCause</span> <span class=operator>=</span> StandardWrapper.getRootCause(e);</span><br><span class=line> <span class=keyword>if</span> (!(rootCause <span class=keyword>instanceof</span> ClientAbortException)) {</span><br><span class=line> container.getLogger().error(sm.getString(</span><br><span class=line> <span class=string>"standardWrapper.serviceExceptionRoot"</span>,</span><br><span class=line> wrapper.getName(), context.getName(), e.getMessage()),</span><br><span class=line> rootCause);</span><br><span class=line> }</span><br><span class=line> throwable = e;</span><br><span class=line> exception(request, response, e);</span><br><span class=line> } <span class=keyword>catch</span> (Throwable e) {</span><br><span class=line> ExceptionUtils.handleThrowable(e);</span><br><span class=line> container.getLogger().error(sm.getString(</span><br><span class=line> <span class=string>"standardWrapper.serviceException"</span>, wrapper.getName(),</span><br><span class=line> context.getName()), e);</span><br><span class=line> throwable = e;</span><br><span class=line> exception(request, response, e);</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=comment>// Release the filter chain (if any) for this request</span></span><br><span class=line> <span class=keyword>if</span> (filterChain != <span class=literal>null</span>) {</span><br><span class=line> filterChain.release();</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Deallocate the allocated servlet instance</span></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>if</span> (servlet != <span class=literal>null</span>) {</span><br><span class=line> wrapper.deallocate(servlet);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (Throwable e) {</span><br><span class=line> ExceptionUtils.handleThrowable(e);</span><br><span class=line> container.getLogger().error(sm.getString(<span class=string>"standardWrapper.deallocateException"</span>,</span><br><span class=line> wrapper.getName()), e);</span><br><span class=line> <span class=keyword>if</span> (throwable == <span class=literal>null</span>) {</span><br><span class=line> throwable = e;</span><br><span class=line> exception(request, response, e);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// If this servlet has been marked permanently unavailable,</span></span><br><span class=line> <span class=comment>// unload it and release this instance</span></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>if</span> ((servlet != <span class=literal>null</span>) &&</span><br><span class=line> (wrapper.getAvailable() == Long.MAX_VALUE)) {</span><br><span class=line> wrapper.unload();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (Throwable e) {</span><br><span class=line> ExceptionUtils.handleThrowable(e);</span><br><span class=line> container.getLogger().error(sm.getString(<span class=string>"standardWrapper.unloadException"</span>,</span><br><span class=line> wrapper.getName()), e);</span><br><span class=line> <span class=keyword>if</span> (throwable == <span class=literal>null</span>) {</span><br><span class=line> exception(request, response, e);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> <span class=type>long</span> t2=System.currentTimeMillis();</span><br><span class=line></span><br><span class=line> <span class=type>long</span> time=t2-t1;</span><br><span class=line> processingTime += time;</span><br><span class=line> <span class=keyword>if</span>( time > maxTime) {</span><br><span class=line> maxTime=time;</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span>( time < minTime) {</span><br><span class=line> minTime=time;</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>这里就会创建 ApplicationFilterChain 然后进行<br><code>filterChain.doFilter(request.getRequest(), response.getResponse());</code><br>doFilter 处理</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/2023/09/24/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E4%B8%89-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Coyote/ 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=/2023/09/24/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E4%B8%89-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Coyote/ itemprop=url>Tomcat 系列篇三-介绍下 Coyote</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：2023-09-24 21:36:43" datetime=2023-09-24T21:36:43+08:00>2023-09-24</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 itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/SpringBoot/Tomcat/ itemprop=url rel=index><span itemprop=name>Tomcat</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="Tomcat 系列篇三-介绍下 Coyote" id=/2023/09/24/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E4%B8%89-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Coyote/ 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=/2023/09/24/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E4%B8%89-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Coyote/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/09/24/Tomcat-系列篇三-介绍下-Coyote/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>前面介绍了 connector，这里边还有个很重要的概念是 Coyote，真正将前面的 connector 跟后面的 container 做了连接，<br><code>org.apache.tomcat.util.net.AbstractEndpoint#createSocketProcessor</code> 从这里开始<br>然后会调用到 <code>org.apache.tomcat.util.net.NioEndpoint#createSocketProcessor</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>protected</span> SocketProcessorBase<NioChannel> <span class="title function_">createSocketProcessor</span><span class=params>(</span></span><br><span class=line><span class=params> SocketWrapperBase<NioChannel> socketWrapper, SocketEvent event)</span> {</span><br><span class=line> <span class=keyword>return</span> <span class=keyword>new</span> <span class="title class_">SocketProcessor</span>(socketWrapper, event);</span><br><span class=line>}</span><br></pre></table></figure><p>里面实际的是 new 了<br><code>org.apache.tomcat.util.net.NioEndpoint.SocketProcessor#SocketProcessor</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br></pre><td class=code><pre><span class=line><span class=keyword>protected</span> <span class=keyword>class</span> <span class="title class_">SocketProcessor</span> <span class=keyword>extends</span> <span class="title class_">SocketProcessorBase</span><NioChannel> {</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class="title function_">SocketProcessor</span><span class=params>(SocketWrapperBase<NioChannel> socketWrapper, SocketEvent event)</span> {</span><br><span class=line> <span class=built_in>super</span>(socketWrapper, event);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=meta>@Override</span></span><br><span class=line> <span class=keyword>protected</span> <span class=keyword>void</span> <span class="title function_">doRun</span><span class=params>()</span> {</span><br><span class=line> <span class=comment>/*</span></span><br><span class=line><span class=comment> * Do not cache and re-use the value of socketWrapper.getSocket() in</span></span><br><span class=line><span class=comment> * this method. If the socket closes the value will be updated to</span></span><br><span class=line><span class=comment> * CLOSED_NIO_CHANNEL and the previous value potentially re-used for</span></span><br><span class=line><span class=comment> * a new connection. That can result in a stale cached value which</span></span><br><span class=line><span class=comment> * in turn can result in unintentionally closing currently active</span></span><br><span class=line><span class=comment> * connections.</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line> <span class=type>Poller</span> <span class=variable>poller</span> <span class=operator>=</span> NioEndpoint.<span class=built_in>this</span>.poller;</span><br><span class=line> <span class=keyword>if</span> (poller == <span class=literal>null</span>) {</span><br><span class=line> socketWrapper.close();</span><br></pre></table></figure><p>然后是 <code>org.apache.tomcat.util.net.NioEndpoint.SocketProcessor#doRun</code> 这里开始运行<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br></pre><td class=code><pre><span class=line><span class=keyword>protected</span> <span class=keyword>void</span> <span class="title function_">doRun</span><span class=params>()</span> {</span><br><span class=line> <span class=comment>/*</span></span><br><span class=line><span class=comment> * Do not cache and re-use the value of socketWrapper.getSocket() in</span></span><br><span class=line><span class=comment> * this method. If the socket closes the value will be updated to</span></span><br><span class=line><span class=comment> * CLOSED_NIO_CHANNEL and the previous value potentially re-used for</span></span><br><span class=line><span class=comment> * a new connection. That can result in a stale cached value which</span></span><br><span class=line><span class=comment> * in turn can result in unintentionally closing currently active</span></span><br><span class=line><span class=comment> * connections.</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line> <span class=type>Poller</span> <span class=variable>poller</span> <span class=operator>=</span> NioEndpoint.<span class=built_in>this</span>.poller;</span><br><span class=line> <span class=keyword>if</span> (poller == <span class=literal>null</span>) {</span><br><span class=line> socketWrapper.close();</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=type>int</span> <span class=variable>handshake</span> <span class=operator>=</span> -<span class=number>1</span>;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>if</span> (socketWrapper.getSocket().isHandshakeComplete()) {</span><br><span class=line> <span class=comment>// No TLS handshaking required. Let the handler</span></span><br><span class=line> <span class=comment>// process this socket / event combination.</span></span><br><span class=line> handshake = <span class=number>0</span>;</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (event == SocketEvent.STOP || event == SocketEvent.DISCONNECT ||</span><br><span class=line> event == SocketEvent.ERROR) {</span><br><span class=line> <span class=comment>// Unable to complete the TLS handshake. Treat it as</span></span><br><span class=line> <span class=comment>// if the handshake failed.</span></span><br><span class=line> handshake = -<span class=number>1</span>;</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> handshake = socketWrapper.getSocket().handshake(event == SocketEvent.OPEN_READ, event == SocketEvent.OPEN_WRITE);</span><br><span class=line> <span class=comment>// The handshake process reads/writes from/to the</span></span><br><span class=line> <span class=comment>// socket. status may therefore be OPEN_WRITE once</span></span><br><span class=line> <span class=comment>// the handshake completes. However, the handshake</span></span><br><span class=line> <span class=comment>// happens when the socket is opened so the status</span></span><br><span class=line> <span class=comment>// must always be OPEN_READ after it completes. It</span></span><br><span class=line> <span class=comment>// is OK to always set this as it is only used if</span></span><br><span class=line> <span class=comment>// the handshake completes.</span></span><br><span class=line> event = SocketEvent.OPEN_READ;</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (IOException x) {</span><br><span class=line> handshake = -<span class=number>1</span>;</span><br><span class=line> <span class=keyword>if</span> (log.isDebugEnabled()) {</span><br><span class=line> log.debug(<span class=string>"Error during SSL handshake"</span>,x);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (CancelledKeyException ckx) {</span><br><span class=line> handshake = -<span class=number>1</span>;</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (handshake == <span class=number>0</span>) {</span><br><span class=line> <span class=type>SocketState</span> <span class=variable>state</span> <span class=operator>=</span> SocketState.OPEN;</span><br><span class=line> <span class=comment>// Process the request from this socket</span></span><br><span class=line> <span class=keyword>if</span> (event == <span class=literal>null</span>) {</span><br><span class=line> state = getHandler().process(socketWrapper, SocketEvent.OPEN_READ);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> state = getHandler().process(socketWrapper, event);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (state == SocketState.CLOSED) {</span><br><span class=line> poller.cancelledKey(getSelectionKey(), socketWrapper);</span><br><span class=line> }</span><br></pre></table></figure><p><code>org.apache.coyote.AbstractProtocol.ConnectionHandler#process</code> 这个 <code>getHandler</code> 是哪个呢<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class="title function_">AbstractHttp11Protocol</span><span class=params>(AbstractEndpoint<S,?> endpoint)</span> {</span><br><span class=line> <span class=built_in>super</span>(endpoint);</span><br><span class=line> setConnectionTimeout(Constants.DEFAULT_CONNECTION_TIMEOUT);</span><br><span class=line> ConnectionHandler<S> cHandler = <span class=keyword>new</span> <span class="title class_">ConnectionHandler</span><>(<span class=built_in>this</span>);</span><br><span class=line> setHandler(cHandler);</span><br><span class=line> getEndpoint().setHandler(cHandler);</span><br><span class=line>}</span><br></pre></table></figure><p>上面补充下这个 Handler，帮助后面的理解，而这个 connectionHandler 则是实现了 <code>AbstractEndpoint.Handler</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br></pre><td class=code><pre><span class=line><span class=keyword>protected</span> <span class=keyword>static</span> <span class=keyword>class</span> <span class="title class_">ConnectionHandler</span><S> <span class=keyword>implements</span> <span class="title class_">AbstractEndpoint</span>.Handler<S> {</span><br><span class=line></span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> AbstractProtocol<S> proto;</span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> <span class=type>RequestGroupInfo</span> <span class=variable>global</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">RequestGroupInfo</span>();</span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> <span class=type>AtomicLong</span> <span class=variable>registerCount</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">AtomicLong</span>(<span class=number>0</span>);</span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> <span class=type>RecycledProcessors</span> <span class=variable>recycledProcessors</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">RecycledProcessors</span>(<span class=built_in>this</span>);</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class="title function_">ConnectionHandler</span><span class=params>(AbstractProtocol<S> proto)</span> {</span><br><span class=line> <span class=built_in>this</span>.proto = proto;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>protected</span> AbstractProtocol<S> <span class="title function_">getProtocol</span><span class=params>()</span> {</span><br><span class=line> <span class=keyword>return</span> proto;</span><br><span class=line> }</span><br></pre></table></figure><p>然后会继续寻找真实的 Processer<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> SocketState <span class="title function_">process</span><span class=params>(SocketWrapperBase<S> wrapper, SocketEvent status)</span> {</span><br><span class=line> <span class=keyword>if</span> (getLog().isDebugEnabled()) {</span><br><span class=line> getLog().debug(sm.getString(<span class=string>"abstractConnectionHandler.process"</span>,</span><br><span class=line> wrapper.getSocket(), status));</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (wrapper == <span class=literal>null</span>) {</span><br><span class=line> <span class=comment>// Nothing to do. Socket has been closed.</span></span><br><span class=line> <span class=keyword>return</span> SocketState.CLOSED;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>S</span> <span class=variable>socket</span> <span class=operator>=</span> wrapper.getSocket();</span><br><span class=line></span><br><span class=line> <span class=type>Processor</span> <span class=variable>processor</span> <span class=operator>=</span> (Processor) wrapper.getCurrentProcessor();</span><br><span class=line> <span class=keyword>if</span> (getLog().isDebugEnabled()) {</span><br><span class=line> getLog().debug(sm.getString(<span class=string>"abstractConnectionHandler.connectionsGet"</span>,</span><br><span class=line> processor, socket));</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 省略代码</span></span><br><span class=line> <span class=comment>// 直到这里创建 processor</span></span><br><span class=line> <span class=keyword>if</span> (processor == <span class=literal>null</span>) {</span><br><span class=line> processor = getProtocol().createProcessor();</span><br><span class=line> register(processor);</span><br><span class=line> <span class=keyword>if</span> (getLog().isDebugEnabled()) {</span><br><span class=line> getLog().debug(sm.getString(<span class=string>"abstractConnectionHandler.processorCreate"</span>, processor));</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>也就是 <code>org.apache.coyote.http11.AbstractHttp11Protocol#createProcessor</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>protected</span> Processor <span class="title function_">createProcessor</span><span class=params>()</span> {</span><br><span class=line> <span class=type>Http11Processor</span> <span class=variable>processor</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">Http11Processor</span>(<span class=built_in>this</span>, adapter);</span><br><span class=line> <span class=keyword>return</span> processor;</span><br><span class=line>}</span><br></pre></table></figure><p>再往后就是调用 process 方法了，然后它是 Http11Processor 的抽象父类<br><code>org.apache.coyote.AbstractProcessorLight</code><br>会调用 <code>org.apache.coyote.AbstractProcessorLight#process</code> 来处理前面说的 socket<br>接着会跑到这<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> SocketState <span class="title function_">process</span><span class=params>(SocketWrapperBase<?> socketWrapper, SocketEvent status)</span></span><br><span class=line> <span class=keyword>throws</span> IOException {</span><br><span class=line></span><br><span class=line> <span class=type>SocketState</span> <span class=variable>state</span> <span class=operator>=</span> SocketState.CLOSED;</span><br><span class=line> Iterator<DispatchType> dispatches = <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>do</span> {</span><br><span class=line> <span class=keyword>if</span> (dispatches != <span class=literal>null</span>) {</span><br><span class=line> <span class=type>DispatchType</span> <span class=variable>nextDispatch</span> <span class=operator>=</span> dispatches.next();</span><br><span class=line> <span class=keyword>if</span> (getLog().isDebugEnabled()) {</span><br><span class=line> getLog().debug(<span class=string>"Processing dispatch type: ["</span> + nextDispatch + <span class=string>"]"</span>);</span><br><span class=line> }</span><br><span class=line> state = dispatch(nextDispatch.getSocketStatus());</span><br><span class=line> <span class=keyword>if</span> (!dispatches.hasNext()) {</span><br><span class=line> state = checkForPipelinedData(state, socketWrapper);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (status == SocketEvent.DISCONNECT) {</span><br><span class=line> <span class=comment>// Do nothing here, just wait for it to get recycled</span></span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (isAsync() || isUpgrade() || state == SocketState.ASYNC_END) {</span><br><span class=line> state = dispatch(status);</span><br><span class=line> state = checkForPipelinedData(state, socketWrapper);</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (status == SocketEvent.OPEN_WRITE) {</span><br><span class=line> <span class=comment>// Extra write event likely after async, ignore</span></span><br><span class=line> state = SocketState.LONG;</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (status == SocketEvent.OPEN_READ) {</span><br><span class=line> state = service(socketWrapper);</span><br></pre></table></figure><p>接下去就是<br><code>org.apache.coyote.http11.Http11Processor#service</code><br>再就是调用coyote的 service 方法也就是 <code>org.apache.catalina.connector.CoyoteAdapter#service</code><br>这里就会调用到<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br></pre><td class=code><pre><span class=line></span><br><span class=line>connector.getService().getContainer().getPipeline().getFirst().invoke(</span><br><span class=line> request, response);</span><br><span class=line> </span><br></pre></table></figure><p>然后进行 valve 串的执行到 <code>org.apache.catalina.core.StandardWrapperValve#invoke</code> 中<br>会调用<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br></pre><td class=code><pre><span class=line>filterChain.doFilter</span><br><span class=line> (request.getRequest(), response.getResponse());</span><br></pre></table></figure><p>就会执行 filter 链<br>最后到<br><code>org.apache.catalina.core.ApplicationFilterChain#internalDoFilter</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br></pre><td class=code><pre><span class=line>servlet.service(request, response);</span><br></pre></table></figure><p>就到了 DispatcherServlet 处理的流程, 这样就和之前介绍 DispatcherServlet开始的请求处理接上了。</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/21/ rel=prev title=上一页><i class="fa fa-angle-left"></i></a><a class=page-number href=/>1</a><span class=space>…</span><a class=page-number href=/page/21/>21</a><span class="page-number current">22</span><a class=page-number href=/page/23/>23</a><span class=space>…</span><a class=page-number href=/page/69/>69</a><a class="extend next" aria-label=下一页 href=/page/23/ rel=next title=下一页><i class="fa 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