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class=tag-list-item><a class=tag-list-link href=/tags/SpringBoot/ rel=tag>SpringBoot</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/Sql%E6%B3%A8%E5%85%A5/ rel=tag>Sql注入</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Stream/ rel=tag>Stream</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Synchronized/ rel=tag>Synchronized</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/Thread-dump/ rel=tag>Thread dump</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ThreadLocal/ rel=tag>ThreadLocal</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ThreadPool/ rel=tag>ThreadPool</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Tomcat/ rel=tag>Tomcat</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Trapping-Rain-Water/ rel=tag>Trapping Rain Water</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/WeakReference/ rel=tag>WeakReference</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Web/ rel=tag>Web</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Webhook/ rel=tag>Webhook</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/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/docker/ rel=tag>docker</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/dp/ rel=tag>dp</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/dubbo/ rel=tag>dubbo</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/echo/ rel=tag>echo</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/environment/ rel=tag>environment</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/gap-lock/ rel=tag>gap lock</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/gc/ rel=tag>gc</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/git/ rel=tag>git</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/grep/ rel=tag>grep</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/hadoop/ rel=tag>hadoop</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/headscale/ rel=tag>headscale</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/icu4c/ rel=tag>icu4c</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/im/ rel=tag>im</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/is-not-null/ rel=tag>is not null</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/is-null/ rel=tag>is null</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/j-u-c/ rel=tag>j.u.c</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/java/ rel=tag>java</a><span class=tag-list-count>33</span><li class=tag-list-item><a class=tag-list-link href=/tags/jvm/ rel=tag>jvm</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/leetcode/ rel=tag>leetcode</a><span class=tag-list-count>40</span><li class=tag-list-item><a class=tag-list-link href=/tags/leetcode-155/ rel=tag>leetcode 155</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/linked-list/ rel=tag>linked list</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/linux/ rel=tag>linux</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/lock/ rel=tag>lock</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/mfc/ rel=tag>mfc</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/min-stack/ rel=tag>min stack</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/mq/ rel=tag>mq</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/mvcc/ rel=tag>mvcc</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/mysql/ rel=tag>mysql</a><span class=tag-list-count>6</span><li class=tag-list-item><a class=tag-list-link href=/tags/namespace/ rel=tag>namespace</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/next-key-lock/ rel=tag>next-key lock</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/nginx/ rel=tag>nginx</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/nullsfirst/ rel=tag>nullsfirst</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/openresty/ rel=tag>openresty</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/php/ rel=tag>php</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/powershell/ rel=tag>powershell</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/procedure/ rel=tag>procedure</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/python/ rel=tag>python</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/read-view/ rel=tag>read view</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/redis/ rel=tag>redis</a><span class=tag-list-count>12</span><li class=tag-list-item><a class=tag-list-link href=/tags/scp/ rel=tag>scp</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/signal/ rel=tag>signal</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/sort/ rel=tag>sort</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/spark/ rel=tag>spark</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ssh/ rel=tag>ssh</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/stack/ rel=tag>stack</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/stream/ rel=tag>stream</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/string/ rel=tag>string</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/swoole/ rel=tag>swoole</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/top/ rel=tag>top</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/uname/ rel=tag>uname</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/unlock/ rel=tag>unlock</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8/ rel=tag>utf8</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4/ rel=tag>utf8mb4</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4-0900-ai-ci/ rel=tag>utf8mb4_0900_ai_ci</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4-general-ci/ rel=tag>utf8mb4_general_ci</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4-unicode-ci/ rel=tag>utf8mb4_unicode_ci</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/value/ rel=tag>value</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/websocket/ rel=tag>websocket</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/zookeeper/ rel=tag>zookeeper</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/zsh/ rel=tag>zsh</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%89%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/ rel=tag>三阶段提交</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%8D%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/ rel=tag>不可变引用</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%9C%E4%BA%AC%E5%A5%A5%E8%BF%90%E4%BC%9A/ rel=tag>东京奥运会</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%A4%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/ rel=tag>两阶段提交</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%AD%E5%B1%B1%E8%B7%AF/ rel=tag>中山路</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%AD%E5%BA%8F/ rel=tag>中序</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%AD%E9%97%B4%E4%BB%B6/ rel=tag>中间件</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%BE%E9%87%8D/ rel=tag>举重</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B9%92%E4%B9%93%E7%90%83/ rel=tag>乒乓球</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%BA%8B%E5%8A%A1/ rel=tag>事务</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%BA%8C%E5%8F%89%E6%A0%91/ rel=tag>二叉树</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%BA%92%E6%96%A5%E9%94%81/ rel=tag>互斥锁</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%BB%A3%E7%A0%81%E9%A2%98%E8%A7%A3/ rel=tag>代码题解</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%BF%AE%E7%94%B5%E8%84%91%E7%9A%84/ rel=tag>修电脑的</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%81%8F%E5%90%91%E9%94%81/ rel=tag>偏向锁</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%81%A5%E5%BA%B7%E7%A0%81/ rel=tag>健康码</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%85%AC%E4%BA%A4/ rel=tag>公交</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%85%AC%E4%BA%A4%E8%BD%A6/ rel=tag>公交车</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%86%85%E5%AD%98%E5%88%86%E5%B8%83/ rel=tag>内存分布</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/ rel=tag>内存泄漏</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%87%86%E5%A4%87/ rel=tag>准备</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%87%8F%E8%82%A5/ rel=tag>减肥</a><span class=tag-list-count>6</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>5</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%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>5</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%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%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%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%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>41</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>1</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>3</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>6</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%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>8</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 class=tag-list-item><a class=tag-list-link href=/tags/%E9%87%8D%E9%87%8F%E7%BA%A7%E9%94%81/ rel=tag>重量级锁</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E9%93%BE%E6%8E%A5/ rel=tag>链接</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E9%A2%98%E8%A7%A3/ rel=tag>题解</a><span class=tag-list-count>24</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E9%A9%AC%E6%88%8F%E5%9B%A2/ rel=tag>马戏团</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E9%AA%8C%E8%AF%81/ rel=tag>验证</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E9%AA%91%E8%BD%A6/ rel=tag>骑车</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E9%AB%98%E9%80%9F/ rel=tag>高速</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E9%BC%93%E6%B5%AA%E5%B1%BF/ rel=tag>鼓浪屿</a><span class=tag-list-count>1</span></ul></canvas></div></div></div></div></div><div class="sidebar-inner sidebar-blogroll"><div class="links-of-blogroll animated"><div class=links-of-blogroll-title><i class="fa fa-globe fa-fw"></i> 链接</div><ul class=links-of-blogroll-list><li class=links-of-blogroll-item><a href=https://covermusic.cn/ rel=noopener target=_blank title=https://covermusic.cn>69伙伴</a></ul></div></div></aside></div><div class="main-inner index posts-expand"><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2023/01/22/Headscale%E5%88%9D%E4%BD%93%E9%AA%8C%E4%BB%A5%E5%8F%8A%E8%B8%A9%E5%9D%91%E8%AE%B0/ 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=/2023/01/22/Headscale%E5%88%9D%E4%BD%93%E9%AA%8C%E4%BB%A5%E5%8F%8A%E8%B8%A9%E5%9D%91%E8%AE%B0/ itemprop=url>Headscale初体验以及踩坑记</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：2023-01-22 21:14:21" datetime=2023-01-22T21:14:21+08:00>2023-01-22</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/headscale/ itemprop=url rel=index><span itemprop=name>headscale</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title=Headscale初体验以及踩坑记 id=/2023/01/22/Headscale%E5%88%9D%E4%BD%93%E9%AA%8C%E4%BB%A5%E5%8F%8A%E8%B8%A9%E5%9D%91%E8%AE%B0/ 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=/2023/01/22/Headscale%E5%88%9D%E4%BD%93%E9%AA%8C%E4%BB%A5%E5%8F%8A%E8%B8%A9%E5%9D%91%E8%AE%B0/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/01/22/Headscale初体验以及踩坑记/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>最近或者说很久以前就想着能够把几个散装服务器以及家里的网络连起来，譬如一些remote desktop的访问，之前搞了下frp，因为家里电脑没怎么注意安全性就被搞了一下，所以还是想用相对更安全的方式，比如限定ip和端口进行访问，但是感觉ip也不固定就比较难搞，后来看到了 <code>Tailscale</code> 和 <code>Headscale</code> 的方式，就想着试试看，没想到一开始就踩了几个比较莫名其妙的坑。<br>可以按<a href=https://github.com/juanfont/headscale/blob/main/docs/running-headscale-linux.md rel=noopener target=_blank>官方文档</a>去搭建，也可以在网上找一些其他人搭建的教程。我碰到的主要是关于配置文件的问题<h3 id=第一个问题><a class=headerlink href=#第一个问题 title=第一个问题></a>第一个问题</h3><pre class="line-numbers language-bash" data-language=bash><code class=language-bash>Error initializing <span class="token assign-left variable">error</span><span class="token operator">=</span><span class="token string">"failed to read or create private key: failed to save private key to disk: open /etc/headscale/private.key: read-only file system"</span><span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>其实一开始看到这个我都有点懵了，咋回事呢，<code>read-only file system</code>一般有可能是文件系统出问题了，不可写入，需要重启或者修改挂载方式，被这个错误的错误日志给误导了，后面才知道是配置文件，在另一个教程中也有个类似的回复，一开始没注意，其实就是同一个问题。<br>默认的配置文件是这样的<pre class="line-numbers language-yaml" data-language=yaml><code class=language-yaml><span class="token punctuation">---</span>
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<span class="token comment"># headscale will look for a configuration file named `config.yaml` (or `config.json`) in the following order:</span>
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<span class="token comment">#</span>
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<span class="token comment"># - `/etc/headscale`</span>
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<span class="token comment"># - `~/.headscale`</span>
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<span class="token comment"># - current working directory</span>
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<span class="token comment"># The url clients will connect to.</span>
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<span class="token comment"># Typically this will be a domain like:</span>
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<span class="token comment">#</span>
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<span class="token comment"># https://myheadscale.example.com:443</span>
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<span class="token comment">#</span>
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<span class="token key atrule">server_url</span><span class="token punctuation">:</span> http<span class="token punctuation">:</span>//127.0.0.1<span class="token punctuation">:</span><span class="token number">8080</span>
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<span class="token comment"># Address to listen to / bind to on the server</span>
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<span class="token comment">#</span>
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<span class="token comment"># For production:</span>
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<span class="token comment"># listen_addr: 0.0.0.0:8080</span>
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<span class="token key atrule">listen_addr</span><span class="token punctuation">:</span> 127.0.0.1<span class="token punctuation">:</span><span class="token number">8080</span>
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<span class="token comment"># Address to listen to /metrics, you may want</span>
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<span class="token comment"># to keep this endpoint private to your internal</span>
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<span class="token comment"># network</span>
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<span class="token comment">#</span>
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<span class="token key atrule">metrics_listen_addr</span><span class="token punctuation">:</span> 127.0.0.1<span class="token punctuation">:</span><span class="token number">9090</span>
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<span class="token comment"># Address to listen for gRPC.</span>
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<span class="token comment"># gRPC is used for controlling a headscale server</span>
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<span class="token comment"># remotely with the CLI</span>
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<span class="token comment"># Note: Remote access _only_ works if you have</span>
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<span class="token comment"># valid certificates.</span>
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<span class="token comment">#</span>
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<span class="token comment"># For production:</span>
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<span class="token comment"># grpc_listen_addr: 0.0.0.0:50443</span>
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<span class="token key atrule">grpc_listen_addr</span><span class="token punctuation">:</span> 127.0.0.1<span class="token punctuation">:</span><span class="token number">50443</span>
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<span class="token comment"># Allow the gRPC admin interface to run in INSECURE</span>
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<span class="token comment"># mode. This is not recommended as the traffic will</span>
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<span class="token comment"># be unencrypted. Only enable if you know what you</span>
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<span class="token comment"># are doing.</span>
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<span class="token key atrule">grpc_allow_insecure</span><span class="token punctuation">:</span> <span class="token boolean important">false</span>
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<span class="token comment"># Private key used to encrypt the traffic between headscale</span>
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<span class="token comment"># and Tailscale clients.</span>
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<span class="token comment"># The private key file will be autogenerated if it's missing.</span>
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<span class="token comment">#</span>
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<span class="token comment"># For production:</span>
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<span class="token comment"># /var/lib/headscale/private.key</span>
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<span class="token key atrule">private_key_path</span><span class="token punctuation">:</span> ./private.key
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<span class="token comment"># The Noise section includes specific configuration for the</span>
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<span class="token comment"># TS2021 Noise protocol</span>
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<span class="token key atrule">noise</span><span class="token punctuation">:</span>
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<span class="token comment"># The Noise private key is used to encrypt the</span>
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<span class="token comment"># traffic between headscale and Tailscale clients when</span>
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<span class="token comment"># using the new Noise-based protocol. It must be different</span>
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<span class="token comment"># from the legacy private key.</span>
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<span class="token comment">#</span>
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<span class="token comment"># For production:</span>
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<span class="token comment"># private_key_path: /var/lib/headscale/noise_private.key</span>
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<span class="token key atrule">private_key_path</span><span class="token punctuation">:</span> ./noise_private.key
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<span class="token comment"># List of IP prefixes to allocate tailaddresses from.</span>
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<span class="token comment"># Each prefix consists of either an IPv4 or IPv6 address,</span>
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<span class="token comment"># and the associated prefix length, delimited by a slash.</span>
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<span class="token comment"># While this looks like it can take arbitrary values, it</span>
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<span class="token comment"># needs to be within IP ranges supported by the Tailscale</span>
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<span class="token comment"># client.</span>
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<span class="token comment"># IPv6: https://github.com/tailscale/tailscale/blob/22ebb25e833264f58d7c3f534a8b166894a89536/net/tsaddr/tsaddr.go#LL81C52-L81C71</span>
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<span class="token comment"># IPv4: https://github.com/tailscale/tailscale/blob/22ebb25e833264f58d7c3f534a8b166894a89536/net/tsaddr/tsaddr.go#L33</span>
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<span class="token key atrule">ip_prefixes</span><span class="token punctuation">:</span>
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<span class="token punctuation">-</span> fd7a<span class="token punctuation">:</span>115c<span class="token punctuation">:</span>a1e0<span class="token punctuation">:</span><span class="token punctuation">:</span>/48
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<span class="token punctuation">-</span> 100.64.0.0/10
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<span class="token comment"># DERP is a relay system that Tailscale uses when a direct</span>
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<span class="token comment"># connection cannot be established.</span>
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<span class="token comment"># https://tailscale.com/blog/how-tailscale-works/#encrypted-tcp-relays-derp</span>
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<span class="token comment">#</span>
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<span class="token comment"># headscale needs a list of DERP servers that can be presented</span>
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<span class="token comment"># to the clients.</span>
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<span class="token key atrule">derp</span><span class="token punctuation">:</span>
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<span class="token key atrule">server</span><span class="token punctuation">:</span>
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<span class="token comment"># If enabled, runs the embedded DERP server and merges it into the rest of the DERP config</span>
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<span class="token comment"># The Headscale server_url defined above MUST be using https, DERP requires TLS to be in place</span>
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<span class="token key atrule">enabled</span><span class="token punctuation">:</span> <span class="token boolean important">false</span>
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<span class="token comment"># Region ID to use for the embedded DERP server.</span>
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<span class="token comment"># The local DERP prevails if the region ID collides with other region ID coming from</span>
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<span class="token comment"># the regular DERP config.</span>
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<span class="token key atrule">region_id</span><span class="token punctuation">:</span> <span class="token number">999</span>
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<span class="token comment"># Region code and name are displayed in the Tailscale UI to identify a DERP region</span>
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<span class="token key atrule">region_code</span><span class="token punctuation">:</span> <span class="token string">"headscale"</span>
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<span class="token key atrule">region_name</span><span class="token punctuation">:</span> <span class="token string">"Headscale Embedded DERP"</span>
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<span class="token comment"># Listens over UDP at the configured address for STUN connections - to help with NAT traversal.</span>
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<span class="token comment"># When the embedded DERP server is enabled stun_listen_addr MUST be defined.</span>
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<span class="token comment">#</span>
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<span class="token comment"># For more details on how this works, check this great article: https://tailscale.com/blog/how-tailscale-works/</span>
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<span class="token key atrule">stun_listen_addr</span><span class="token punctuation">:</span> <span class="token string">"0.0.0.0:3478"</span>
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<span class="token comment"># List of externally available DERP maps encoded in JSON</span>
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<span class="token key atrule">urls</span><span class="token punctuation">:</span>
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<span class="token punctuation">-</span> https<span class="token punctuation">:</span>//controlplane.tailscale.com/derpmap/default
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<span class="token comment"># Locally available DERP map files encoded in YAML</span>
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<span class="token comment">#</span>
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<span class="token comment"># This option is mostly interesting for people hosting</span>
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<span class="token comment"># their own DERP servers:</span>
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<span class="token comment"># https://tailscale.com/kb/1118/custom-derp-servers/</span>
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<span class="token comment">#</span>
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<span class="token comment"># paths:</span>
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<span class="token comment"># - /etc/headscale/derp-example.yaml</span>
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<span class="token key atrule">paths</span><span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>
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<span class="token comment"># If enabled, a worker will be set up to periodically</span>
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<span class="token comment"># refresh the given sources and update the derpmap</span>
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<span class="token comment"># will be set up.</span>
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<span class="token key atrule">auto_update_enabled</span><span class="token punctuation">:</span> <span class="token boolean important">true</span>
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<span class="token comment"># How often should we check for DERP updates?</span>
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<span class="token key atrule">update_frequency</span><span class="token punctuation">:</span> 24h
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<span class="token comment"># Disables the automatic check for headscale updates on startup</span>
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<span class="token key atrule">disable_check_updates</span><span class="token punctuation">:</span> <span class="token boolean important">false</span>
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<span class="token comment"># Time before an inactive ephemeral node is deleted?</span>
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<span class="token key atrule">ephemeral_node_inactivity_timeout</span><span class="token punctuation">:</span> 30m
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<span class="token comment"># Period to check for node updates within the tailnet. A value too low will severely affect</span>
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<span class="token comment"># CPU consumption of Headscale. A value too high (over 60s) will cause problems</span>
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<span class="token comment"># for the nodes, as they won't get updates or keep alive messages frequently enough.</span>
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<span class="token comment"># In case of doubts, do not touch the default 10s.</span>
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<span class="token key atrule">node_update_check_interval</span><span class="token punctuation">:</span> 10s
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<span class="token comment"># SQLite config</span>
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<span class="token key atrule">db_type</span><span class="token punctuation">:</span> sqlite3
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<span class="token comment"># For production:</span>
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<span class="token comment"># db_path: /var/lib/headscale/db.sqlite</span>
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<span class="token key atrule">db_path</span><span class="token punctuation">:</span> ./db.sqlite
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<span class="token comment"># # Postgres config</span>
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<span class="token comment"># If using a Unix socket to connect to Postgres, set the socket path in the 'host' field and leave 'port' blank.</span>
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<span class="token comment"># db_type: postgres</span>
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<span class="token comment"># db_host: localhost</span>
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<span class="token comment"># db_port: 5432</span>
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<span class="token comment"># db_name: headscale</span>
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<span class="token comment"># db_user: foo</span>
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<span class="token comment"># db_pass: bar</span>
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<span class="token comment"># If other 'sslmode' is required instead of 'require(true)' and 'disabled(false)', set the 'sslmode' you need</span>
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<span class="token comment"># in the 'db_ssl' field. Refers to https://www.postgresql.org/docs/current/libpq-ssl.html Table 34.1.</span>
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<span class="token comment"># db_ssl: false</span>
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<span class="token comment">### TLS configuration</span>
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<span class="token comment">#</span>
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<span class="token comment">## Let's encrypt / ACME</span>
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<span class="token comment">#</span>
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<span class="token comment"># headscale supports automatically requesting and setting up</span>
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<span class="token comment"># TLS for a domain with Let's Encrypt.</span>
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<span class="token comment">#</span>
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<span class="token comment"># URL to ACME directory</span>
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<span class="token key atrule">acme_url</span><span class="token punctuation">:</span> https<span class="token punctuation">:</span>//acme<span class="token punctuation">-</span>v02.api.letsencrypt.org/directory
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<span class="token comment"># Email to register with ACME provider</span>
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<span class="token key atrule">acme_email</span><span class="token punctuation">:</span> <span class="token string">""</span>
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<span class="token comment"># Domain name to request a TLS certificate for:</span>
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<span class="token key atrule">tls_letsencrypt_hostname</span><span class="token punctuation">:</span> <span class="token string">""</span>
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<span class="token comment"># Path to store certificates and metadata needed by</span>
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<span class="token comment"># letsencrypt</span>
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<span class="token comment"># For production:</span>
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<span class="token comment"># tls_letsencrypt_cache_dir: /var/lib/headscale/cache</span>
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<span class="token key atrule">tls_letsencrypt_cache_dir</span><span class="token punctuation">:</span> ./cache
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<span class="token comment"># Type of ACME challenge to use, currently supported types:</span>
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<span class="token comment"># HTTP-01 or TLS-ALPN-01</span>
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<span class="token comment"># See [docs/tls.md](docs/tls.md) for more information</span>
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<span class="token key atrule">tls_letsencrypt_challenge_type</span><span class="token punctuation">:</span> HTTP<span class="token punctuation">-</span><span class="token number">01</span>
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<span class="token comment"># When HTTP-01 challenge is chosen, letsencrypt must set up a</span>
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<span class="token comment"># verification endpoint, and it will be listening on:</span>
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<span class="token comment"># :http = port 80</span>
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<span class="token key atrule">tls_letsencrypt_listen</span><span class="token punctuation">:</span> <span class="token string">":http"</span>
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<span class="token comment">## Use already defined certificates:</span>
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<span class="token key atrule">tls_cert_path</span><span class="token punctuation">:</span> <span class="token string">""</span>
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<span class="token key atrule">tls_key_path</span><span class="token punctuation">:</span> <span class="token string">""</span>
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<span class="token key atrule">log</span><span class="token punctuation">:</span>
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<span class="token comment"># Output formatting for logs: text or json</span>
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<span class="token key atrule">format</span><span class="token punctuation">:</span> text
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<span class="token key atrule">level</span><span class="token punctuation">:</span> info
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<span class="token comment"># Path to a file containg ACL policies.</span>
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<span class="token comment"># ACLs can be defined as YAML or HUJSON.</span>
|
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<span class="token comment"># https://tailscale.com/kb/1018/acls/</span>
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<span class="token key atrule">acl_policy_path</span><span class="token punctuation">:</span> <span class="token string">""</span>
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<span class="token comment">## DNS</span>
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<span class="token comment">#</span>
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<span class="token comment"># headscale supports Tailscale's DNS configuration and MagicDNS.</span>
|
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<span class="token comment"># Please have a look to their KB to better understand the concepts:</span>
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<span class="token comment">#</span>
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<span class="token comment"># - https://tailscale.com/kb/1054/dns/</span>
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<span class="token comment"># - https://tailscale.com/kb/1081/magicdns/</span>
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<span class="token comment"># - https://tailscale.com/blog/2021-09-private-dns-with-magicdns/</span>
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<span class="token comment">#</span>
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<span class="token key atrule">dns_config</span><span class="token punctuation">:</span>
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<span class="token comment"># Whether to prefer using Headscale provided DNS or use local.</span>
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<span class="token key atrule">override_local_dns</span><span class="token punctuation">:</span> <span class="token boolean important">true</span>
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<span class="token comment"># List of DNS servers to expose to clients.</span>
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<span class="token key atrule">nameservers</span><span class="token punctuation">:</span>
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<span class="token punctuation">-</span> 1.1.1.1
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<span class="token comment"># NextDNS (see https://tailscale.com/kb/1218/nextdns/).</span>
|
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<span class="token comment"># "abc123" is example NextDNS ID, replace with yours.</span>
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<span class="token comment">#</span>
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|
<span class="token comment"># With metadata sharing:</span>
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<span class="token comment"># nameservers:</span>
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<span class="token comment"># - https://dns.nextdns.io/abc123</span>
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|
<span class="token comment">#</span>
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<span class="token comment"># Without metadata sharing:</span>
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|
<span class="token comment"># nameservers:</span>
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|
<span class="token comment"># - 2a07:a8c0::ab:c123</span>
|
|
<span class="token comment"># - 2a07:a8c1::ab:c123</span>
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|
|
<span class="token comment"># Split DNS (see https://tailscale.com/kb/1054/dns/),</span>
|
|
<span class="token comment"># list of search domains and the DNS to query for each one.</span>
|
|
<span class="token comment">#</span>
|
|
<span class="token comment"># restricted_nameservers:</span>
|
|
<span class="token comment"># foo.bar.com:</span>
|
|
<span class="token comment"># - 1.1.1.1</span>
|
|
<span class="token comment"># darp.headscale.net:</span>
|
|
<span class="token comment"># - 1.1.1.1</span>
|
|
<span class="token comment"># - 8.8.8.8</span>
|
|
|
|
<span class="token comment"># Search domains to inject.</span>
|
|
<span class="token key atrule">domains</span><span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>
|
|
|
|
<span class="token comment"># Extra DNS records</span>
|
|
<span class="token comment"># so far only A-records are supported (on the tailscale side)</span>
|
|
<span class="token comment"># See https://github.com/juanfont/headscale/blob/main/docs/dns-records.md#Limitations</span>
|
|
<span class="token comment"># extra_records:</span>
|
|
<span class="token comment"># - name: "grafana.myvpn.example.com"</span>
|
|
<span class="token comment"># type: "A"</span>
|
|
<span class="token comment"># value: "100.64.0.3"</span>
|
|
<span class="token comment">#</span>
|
|
<span class="token comment"># # you can also put it in one line</span>
|
|
<span class="token comment"># - { name: "prometheus.myvpn.example.com", type: "A", value: "100.64.0.3" }</span>
|
|
|
|
<span class="token comment"># Whether to use [MagicDNS](https://tailscale.com/kb/1081/magicdns/).</span>
|
|
<span class="token comment"># Only works if there is at least a nameserver defined.</span>
|
|
<span class="token key atrule">magic_dns</span><span class="token punctuation">:</span> <span class="token boolean important">true</span>
|
|
|
|
<span class="token comment"># Defines the base domain to create the hostnames for MagicDNS.</span>
|
|
<span class="token comment"># `base_domain` must be a FQDNs, without the trailing dot.</span>
|
|
<span class="token comment"># The FQDN of the hosts will be</span>
|
|
<span class="token comment"># `hostname.user.base_domain` (e.g., _myhost.myuser.example.com_).</span>
|
|
<span class="token key atrule">base_domain</span><span class="token punctuation">:</span> example.com
|
|
|
|
<span class="token comment"># Unix socket used for the CLI to connect without authentication</span>
|
|
<span class="token comment"># Note: for production you will want to set this to something like:</span>
|
|
<span class="token comment"># unix_socket: /var/run/headscale.sock</span>
|
|
<span class="token key atrule">unix_socket</span><span class="token punctuation">:</span> ./headscale.sock
|
|
<span class="token key atrule">unix_socket_permission</span><span class="token punctuation">:</span> <span class="token string">"0770"</span>
|
|
<span class="token comment">#</span>
|
|
<span class="token comment"># headscale supports experimental OpenID connect support,</span>
|
|
<span class="token comment"># it is still being tested and might have some bugs, please</span>
|
|
<span class="token comment"># help us test it.</span>
|
|
<span class="token comment"># OpenID Connect</span>
|
|
<span class="token comment"># oidc:</span>
|
|
<span class="token comment"># only_start_if_oidc_is_available: true</span>
|
|
<span class="token comment"># issuer: "https://your-oidc.issuer.com/path"</span>
|
|
<span class="token comment"># client_id: "your-oidc-client-id"</span>
|
|
<span class="token comment"># client_secret: "your-oidc-client-secret"</span>
|
|
<span class="token comment"># # Alternatively, set `client_secret_path` to read the secret from the file.</span>
|
|
<span class="token comment"># # It resolves environment variables, making integration to systemd's</span>
|
|
<span class="token comment"># # `LoadCredential` straightforward:</span>
|
|
<span class="token comment"># client_secret_path: "${CREDENTIALS_DIRECTORY}/oidc_client_secret"</span>
|
|
<span class="token comment"># # client_secret and client_secret_path are mutually exclusive.</span>
|
|
<span class="token comment">#</span>
|
|
<span class="token comment"># Customize the scopes used in the OIDC flow, defaults to "openid", "profile" and "email" and add custom query</span>
|
|
<span class="token comment"># parameters to the Authorize Endpoint request. Scopes default to "openid", "profile" and "email".</span>
|
|
<span class="token comment">#</span>
|
|
<span class="token comment"># scope: ["openid", "profile", "email", "custom"]</span>
|
|
<span class="token comment"># extra_params:</span>
|
|
<span class="token comment"># domain_hint: example.com</span>
|
|
<span class="token comment">#</span>
|
|
<span class="token comment"># List allowed principal domains and/or users. If an authenticated user's domain is not in this list, the</span>
|
|
<span class="token comment"># authentication request will be rejected.</span>
|
|
<span class="token comment">#</span>
|
|
<span class="token comment"># allowed_domains:</span>
|
|
<span class="token comment"># - example.com</span>
|
|
<span class="token comment"># Groups from keycloak have a leading '/'</span>
|
|
<span class="token comment"># allowed_groups:</span>
|
|
<span class="token comment"># - /headscale</span>
|
|
<span class="token comment"># allowed_users:</span>
|
|
<span class="token comment"># - alice@example.com</span>
|
|
<span class="token comment">#</span>
|
|
<span class="token comment"># If `strip_email_domain` is set to `true`, the domain part of the username email address will be removed.</span>
|
|
<span class="token comment"># This will transform `first-name.last-name@example.com` to the user `first-name.last-name`</span>
|
|
<span class="token comment"># If `strip_email_domain` is set to `false` the domain part will NOT be removed resulting to the following</span>
|
|
<span class="token comment"># user: `first-name.last-name.example.com`</span>
|
|
<span class="token comment">#</span>
|
|
<span class="token comment"># strip_email_domain: true</span>
|
|
|
|
<span class="token comment"># Logtail configuration</span>
|
|
<span class="token comment"># Logtail is Tailscales logging and auditing infrastructure, it allows the control panel</span>
|
|
<span class="token comment"># to instruct tailscale nodes to log their activity to a remote server.</span>
|
|
<span class="token key atrule">logtail</span><span class="token punctuation">:</span>
|
|
<span class="token comment"># Enable logtail for this headscales clients.</span>
|
|
<span class="token comment"># As there is currently no support for overriding the log server in headscale, this is</span>
|
|
<span class="token comment"># disabled by default. Enabling this will make your clients send logs to Tailscale Inc.</span>
|
|
<span class="token key atrule">enabled</span><span class="token punctuation">:</span> <span class="token boolean important">false</span>
|
|
|
|
<span class="token comment"># Enabling this option makes devices prefer a random port for WireGuard traffic over the</span>
|
|
<span class="token comment"># default static port 41641. This option is intended as a workaround for some buggy</span>
|
|
<span class="token comment"># firewall devices. See https://tailscale.com/kb/1181/firewalls/ for more information.</span>
|
|
<span class="token key atrule">randomize_client_port</span><span class="token punctuation">:</span> <span class="token boolean important">false</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>问题就是出在几个文件路径的配置，默认都是当前目录，也就是headscale的可执行文件所在目录，需要按它配置说明中的生产配置进行修改<pre class="line-numbers language-yaml" data-language=yaml><code class=language-yaml><span class="token comment"># For production:</span>
|
|
<span class="token comment"># /var/lib/headscale/private.key</span>
|
|
<span class="token key atrule">private_key_path</span><span class="token punctuation">:</span> /var/lib/headscale/private.key<span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span></span></code></pre><p>直接改成绝对路径就好了，还有两个文件路径<br>另一个也是个秘钥的路径问题<pre class="line-numbers language-yaml" data-language=yaml><code class=language-yaml><span class="token key atrule">noise</span><span class="token punctuation">:</span>
|
|
<span class="token comment"># The Noise private key is used to encrypt the</span>
|
|
<span class="token comment"># traffic between headscale and Tailscale clients when</span>
|
|
<span class="token comment"># using the new Noise-based protocol. It must be different</span>
|
|
<span class="token comment"># from the legacy private key.</span>
|
|
<span class="token comment">#</span>
|
|
<span class="token comment"># For production:</span>
|
|
<span class="token comment"># private_key_path: /var/lib/headscale/noise_private.key</span>
|
|
<span class="token key atrule">private_key_path</span><span class="token punctuation">:</span> /var/lib/headscale/noise_private.key<span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><h3 id=第二个问题><a class=headerlink href=#第二个问题 title=第二个问题></a>第二个问题</h3><p>这个问题也是一种误导，<br>错误信息是<pre class="line-numbers language-bash" data-language=bash><code class=language-bash>Error initializing <span class="token assign-left variable">error</span><span class="token operator">=</span><span class="token string">"unable to open database file: out of memory (14)"</span><span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>这就是个文件，内存也完全没有被占满的迹象，原来也是文件路径的问题<pre class="line-numbers language-yaml" data-language=yaml><code class=language-yaml><span class="token comment"># For production:</span>
|
|
<span class="token comment"># db_path: /var/lib/headscale/db.sqlite</span>
|
|
<span class="token key atrule">db_path</span><span class="token punctuation">:</span> /var/lib/headscale/db.sqlite<span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span></span></code></pre><p>都改成绝对路径就可以了，然后这里还有个就是要对<code>/var/lib/headscale/</code>和<code>/etc/headscale/</code>等路径赋予headscale用户权限，有时候对这类问题的排查真的蛮头疼，日志报错都不是真实的错误信息，开源项目对这些错误的提示真的也需要优化，后续的譬如mac也加入节点等后面再开篇讲</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/2023/01/15/2022-%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/ 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=/2023/01/15/2022-%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/ itemprop=url>2022 年终总结</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：2023-01-15 13:45:17 / 修改时间：13:45:18" datetime=2023-01-15T13:45:17+08:00>2023-01-15</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/%E7%94%9F%E6%B4%BB/ itemprop=url rel=index><span itemprop=name>生活</span></a> </span>， <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/%E7%94%9F%E6%B4%BB/%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/ itemprop=url rel=index><span itemprop=name>年终总结</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="2022 年终总结" id=/2023/01/15/2022-%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/ 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=/2023/01/15/2022-%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/01/15/2022-年终总结/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>一年又一年，时间匆匆，这一年过得不太容易，很多事情都是来得猝不及防，很多规划也照例是没有完成，今年更多了一些，又是比较丧的一篇总结<div class=post-button><a class=btn href=/2023/01/15/2022-%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/#more rel=contents>阅读全文 »</a></div></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/2023/01/08/mybatis%E7%B3%BB%E5%88%97-dataSource%E8%A7%A3%E6%9E%90/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2023/01/08/mybatis%E7%B3%BB%E5%88%97-dataSource%E8%A7%A3%E6%9E%90/ itemprop=url>mybatis系列-dataSource解析</a></h2><div class=post-meta-container><div class=post-meta><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar"></i> </span><span class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间：2023-01-08 20:35:14" datetime=2023-01-08T20:35:14+08:00>2023-01-08</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/ itemprop=url rel=index><span itemprop=name>Java</span></a> </span>， <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/Mybatis/ itemprop=url rel=index><span itemprop=name>Mybatis</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title=mybatis系列-dataSource解析 id=/2023/01/08/mybatis%E7%B3%BB%E5%88%97-dataSource%E8%A7%A3%E6%9E%90/ title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数：</span> <span class=leancloud-visitors-count></span> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-comment"></i> </span><span class=post-meta-item-text>Disqus：</span> <a href=/2023/01/08/mybatis%E7%B3%BB%E5%88%97-dataSource%E8%A7%A3%E6%9E%90/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/01/08/mybatis系列-dataSource解析/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>DataSource 作为数据库查询的最重要的数据源，在 mybatis 中也展开来说下<br>首先是解析的过程<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token class-name">SqlSessionFactory</span> sqlSessionFactory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SqlSessionFactoryBuilder</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span>inputStream<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>在构建 SqlSessionFactory 也就是 DefaultSqlSessionFactory 的时候，<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">SqlSessionFactory</span> <span class="token function">build</span><span class="token punctuation">(</span><span class="token class-name">InputStream</span> inputStream<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> <span class="token function">build</span><span class="token punctuation">(</span>inputStream<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token keyword">public</span> <span class="token class-name">SqlSessionFactory</span> <span class="token function">build</span><span class="token punctuation">(</span><span class="token class-name">InputStream</span> inputStream<span class="token punctuation">,</span> <span class="token class-name">String</span> environment<span class="token punctuation">,</span> <span class="token class-name">Properties</span> properties<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">try</span> <span class="token punctuation">{</span>
|
|
<span class="token class-name">XMLConfigBuilder</span> parser <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLConfigBuilder</span><span class="token punctuation">(</span>inputStream<span class="token punctuation">,</span> environment<span class="token punctuation">,</span> properties<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> <span class="token function">build</span><span class="token punctuation">(</span>parser<span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">throw</span> <span class="token class-name">ExceptionFactory</span><span class="token punctuation">.</span><span class="token function">wrapException</span><span class="token punctuation">(</span><span class="token string">"Error building SqlSession."</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
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<span class="token class-name">ErrorContext</span><span class="token punctuation">.</span><span class="token function">instance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">reset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>inputStream <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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inputStream<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">IOException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// Intentionally ignore. Prefer previous error.</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>前面也说过，就是解析 <code>mybatis-config.xml</code> 成 <code>Configuration</code><pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">Configuration</span> <span class="token function">parse</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>parsed<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Each XMLConfigBuilder can only be used once."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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parsed <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token function">parseConfiguration</span><span class="token punctuation">(</span>parser<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"/configuration"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> configuration<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">parseConfiguration</span><span class="token punctuation">(</span><span class="token class-name">XNode</span> root<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token comment">// issue #117 read properties first</span>
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<span class="token function">propertiesElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"properties"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">Properties</span> settings <span class="token operator">=</span> <span class="token function">settingsAsProperties</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"settings"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">loadCustomVfs</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">loadCustomLogImpl</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">typeAliasesElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"typeAliases"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">pluginElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"plugins"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">objectFactoryElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"objectFactory"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">objectWrapperFactoryElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"objectWrapperFactory"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">reflectorFactoryElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"reflectorFactory"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">settingsElement</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// read it after objectFactory and objectWrapperFactory issue #631</span>
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<span class="token comment">// -------------> 是在这里解析了DataSource</span>
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<span class="token function">environmentsElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"environments"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">databaseIdProviderElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"databaseIdProvider"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">typeHandlerElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"typeHandlers"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">mapperElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"mappers"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Error parsing SQL Mapper Configuration. Cause: "</span> <span class="token operator">+</span> e<span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>环境解析了这一块的内容<pre class="line-numbers language-markup" data-language=markup><code class=language-markup><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>environments</span> <span class="token attr-name">default</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>development<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>environment</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>development<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>transactionManager</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>JDBC<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dataSource</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>POOLED<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>driver<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${driver}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>url<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${url}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${username}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${password}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dataSource</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>environment</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>environments</span><span class="token punctuation">></span></span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>解析也是自上而下的，<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">environmentsElement</span><span class="token punctuation">(</span><span class="token class-name">XNode</span> context<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>context <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>environment <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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environment <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"default"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">XNode</span> child <span class="token operator">:</span> context<span class="token punctuation">.</span><span class="token function">getChildren</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">String</span> id <span class="token operator">=</span> child<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"id"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isSpecifiedEnvironment</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">TransactionFactory</span> txFactory <span class="token operator">=</span> <span class="token function">transactionManagerElement</span><span class="token punctuation">(</span>child<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"transactionManager"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">DataSourceFactory</span> dsFactory <span class="token operator">=</span> <span class="token function">dataSourceElement</span><span class="token punctuation">(</span>child<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"dataSource"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">DataSource</span> dataSource <span class="token operator">=</span> dsFactory<span class="token punctuation">.</span><span class="token function">getDataSource</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">Environment<span class="token punctuation">.</span>Builder</span> environmentBuilder <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Environment<span class="token punctuation">.</span>Builder</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span>
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<span class="token punctuation">.</span><span class="token function">transactionFactory</span><span class="token punctuation">(</span>txFactory<span class="token punctuation">)</span>
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<span class="token punctuation">.</span><span class="token function">dataSource</span><span class="token punctuation">(</span>dataSource<span class="token punctuation">)</span><span class="token punctuation">;</span>
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configuration<span class="token punctuation">.</span><span class="token function">setEnvironment</span><span class="token punctuation">(</span>environmentBuilder<span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">break</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>前面第一步是解析事务管理器元素<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">private</span> <span class="token class-name">TransactionFactory</span> <span class="token function">transactionManagerElement</span><span class="token punctuation">(</span><span class="token class-name">XNode</span> context<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>context <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">String</span> type <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"type"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">Properties</span> props <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getChildrenAsProperties</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">TransactionFactory</span> factory <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">TransactionFactory</span><span class="token punctuation">)</span> <span class="token function">resolveClass</span><span class="token punctuation">(</span>type<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getDeclaredConstructor</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">newInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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factory<span class="token punctuation">.</span><span class="token function">setProperties</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> factory<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Environment declaration requires a TransactionFactory."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而这里的 <code>resolveClass</code> 其实就使用了上一篇的 <code>typeAliases</code> 系统，这里是使用了 <code>JdbcTransactionFactory</code> 作为事务管理器，<br>后面的就是 <code>DataSourceFactory</code> 的创建也是 <code>DataSource</code> 的创建<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">private</span> <span class="token class-name">DataSourceFactory</span> <span class="token function">dataSourceElement</span><span class="token punctuation">(</span><span class="token class-name">XNode</span> context<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>context <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">String</span> type <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"type"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">Properties</span> props <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getChildrenAsProperties</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">DataSourceFactory</span> factory <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">DataSourceFactory</span><span class="token punctuation">)</span> <span class="token function">resolveClass</span><span class="token punctuation">(</span>type<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getDeclaredConstructor</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">newInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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factory<span class="token punctuation">.</span><span class="token function">setProperties</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> factory<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Environment declaration requires a DataSourceFactory."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>因为在config文件中设置了Pooled，所以对应创建的就是 <code>PooledDataSourceFactory</code><br>但是这里其实有个比较需要注意的，mybatis 这里的其实是继承了 <code>UnpooledDataSourceFactory</code><br>将基础方法都放在了 <code>UnpooledDataSourceFactory</code> 中<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">PooledDataSourceFactory</span> <span class="token keyword">extends</span> <span class="token class-name">UnpooledDataSourceFactory</span> <span class="token punctuation">{</span>
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<span class="token keyword">public</span> <span class="token class-name">PooledDataSourceFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>dataSource <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">PooledDataSource</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这里只保留了在构造方法里创建 <code>DataSource</code><br>而这个 <code>PooledDataSource</code> 虽然没有直接继承 <code>UnpooledDataSource</code>，但其实<br>在构造方法里也是<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">PooledDataSource</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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dataSource <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">UnpooledDataSource</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span></span></code></pre><p>至于为什么这么做呢应该也是考虑到能比较多的复用代码，因为 <code>Pooled</code> 其实跟 <code>Unpooled</code> 最重要的差别就在于是不是每次都重开连接<br>使用连接池能够让应用在有大量查询的时候不用反复创建连接，省去了建联的网络等开销，<code>Unpooled</code>就是完成与数据库的连接，并可以获取该连接<br>主要的代码<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token class-name">Connection</span> <span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token function">doGetConnection</span><span class="token punctuation">(</span>username<span class="token punctuation">,</span> password<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token class-name">Connection</span> <span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token class-name">String</span> username<span class="token punctuation">,</span> <span class="token class-name">String</span> password<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token function">doGetConnection</span><span class="token punctuation">(</span>username<span class="token punctuation">,</span> password<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">private</span> <span class="token class-name">Connection</span> <span class="token function">doGetConnection</span><span class="token punctuation">(</span><span class="token class-name">String</span> username<span class="token punctuation">,</span> <span class="token class-name">String</span> password<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">{</span>
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<span class="token class-name">Properties</span> props <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Properties</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>driverProperties <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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props<span class="token punctuation">.</span><span class="token function">putAll</span><span class="token punctuation">(</span>driverProperties<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>username <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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props<span class="token punctuation">.</span><span class="token function">setProperty</span><span class="token punctuation">(</span><span class="token string">"user"</span><span class="token punctuation">,</span> username<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>password <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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props<span class="token punctuation">.</span><span class="token function">setProperty</span><span class="token punctuation">(</span><span class="token string">"password"</span><span class="token punctuation">,</span> password<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">return</span> <span class="token function">doGetConnection</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">private</span> <span class="token class-name">Connection</span> <span class="token function">doGetConnection</span><span class="token punctuation">(</span><span class="token class-name">Properties</span> properties<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">{</span>
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<span class="token function">initializeDriver</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">Connection</span> connection <span class="token operator">=</span> <span class="token class-name">DriverManager</span><span class="token punctuation">.</span><span class="token function">getConnection</span><span class="token punctuation">(</span>url<span class="token punctuation">,</span> properties<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">configureConnection</span><span class="token punctuation">(</span>connection<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> connection<span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而对于Pooled就会处理池化的逻辑<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">private</span> <span class="token class-name">PooledConnection</span> <span class="token function">popConnection</span><span class="token punctuation">(</span><span class="token class-name">String</span> username<span class="token punctuation">,</span> <span class="token class-name">String</span> password<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">{</span>
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<span class="token keyword">boolean</span> countedWait <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
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<span class="token class-name">PooledConnection</span> conn <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<span class="token keyword">long</span> t <span class="token operator">=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">int</span> localBadConnectionCount <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
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<span class="token keyword">while</span> <span class="token punctuation">(</span>conn <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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lock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>state<span class="token punctuation">.</span>idleConnections<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// Pool has available connection</span>
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conn <span class="token operator">=</span> state<span class="token punctuation">.</span>idleConnections<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Checked out connection "</span> <span class="token operator">+</span> conn<span class="token punctuation">.</span><span class="token function">getRealHashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" from pool."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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<span class="token comment">// Pool does not have available connection</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>state<span class="token punctuation">.</span>activeConnections<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator"><</span> poolMaximumActiveConnections<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// Can create new connection</span>
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conn <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">PooledConnection</span><span class="token punctuation">(</span>dataSource<span class="token punctuation">.</span><span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Created connection "</span> <span class="token operator">+</span> conn<span class="token punctuation">.</span><span class="token function">getRealHashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">"."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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<span class="token comment">// Cannot create new connection</span>
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<span class="token class-name">PooledConnection</span> oldestActiveConnection <span class="token operator">=</span> state<span class="token punctuation">.</span>activeConnections<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">long</span> longestCheckoutTime <span class="token operator">=</span> oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getCheckoutTime</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>longestCheckoutTime <span class="token operator">></span> poolMaximumCheckoutTime<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// Can claim overdue connection</span>
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state<span class="token punctuation">.</span>claimedOverdueConnectionCount<span class="token operator">++</span><span class="token punctuation">;</span>
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state<span class="token punctuation">.</span>accumulatedCheckoutTimeOfOverdueConnections <span class="token operator">+=</span> longestCheckoutTime<span class="token punctuation">;</span>
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state<span class="token punctuation">.</span>accumulatedCheckoutTime <span class="token operator">+=</span> longestCheckoutTime<span class="token punctuation">;</span>
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state<span class="token punctuation">.</span>activeConnections<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span>oldestActiveConnection<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getRealConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getAutoCommit</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getRealConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">rollback</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">SQLException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">/*
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|
Just log a message for debug and continue to execute the following
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|
statement like nothing happened.
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|
Wrap the bad connection with a new PooledConnection, this will help
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|
to not interrupt current executing thread and give current thread a
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chance to join the next competition for another valid/good database
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connection. At the end of this loop, bad {@link @conn} will be set as null.
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*/</span>
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log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Bad connection. Could not roll back"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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conn <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">PooledConnection</span><span class="token punctuation">(</span>oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getRealConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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conn<span class="token punctuation">.</span><span class="token function">setCreatedTimestamp</span><span class="token punctuation">(</span>oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getCreatedTimestamp</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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conn<span class="token punctuation">.</span><span class="token function">setLastUsedTimestamp</span><span class="token punctuation">(</span>oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getLastUsedTimestamp</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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oldestActiveConnection<span class="token punctuation">.</span><span class="token function">invalidate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Claimed overdue connection "</span> <span class="token operator">+</span> conn<span class="token punctuation">.</span><span class="token function">getRealHashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">"."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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|
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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|
<span class="token comment">// Must wait</span>
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|
<span class="token keyword">try</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>countedWait<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
state<span class="token punctuation">.</span>hadToWaitCount<span class="token operator">++</span><span class="token punctuation">;</span>
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countedWait <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span>
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|
<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Waiting as long as "</span> <span class="token operator">+</span> poolTimeToWait <span class="token operator">+</span> <span class="token string">" milliseconds for connection."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span>
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|
<span class="token keyword">long</span> wt <span class="token operator">=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
condition<span class="token punctuation">.</span><span class="token function">await</span><span class="token punctuation">(</span>poolTimeToWait<span class="token punctuation">,</span> <span class="token class-name">TimeUnit</span><span class="token punctuation">.</span><span class="token constant">MILLISECONDS</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
state<span class="token punctuation">.</span>accumulatedWaitTime <span class="token operator">+=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> wt<span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token comment">// set interrupt flag</span>
|
|
<span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">interrupt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token keyword">break</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token keyword">if</span> <span class="token punctuation">(</span>conn <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token comment">// ping to server and check the connection is valid or not</span>
|
|
<span class="token keyword">if</span> <span class="token punctuation">(</span>conn<span class="token punctuation">.</span><span class="token function">isValid</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>conn<span class="token punctuation">.</span><span class="token function">getRealConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getAutoCommit</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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conn<span class="token punctuation">.</span><span class="token function">getRealConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">rollback</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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conn<span class="token punctuation">.</span><span class="token function">setConnectionTypeCode</span><span class="token punctuation">(</span><span class="token function">assembleConnectionTypeCode</span><span class="token punctuation">(</span>dataSource<span class="token punctuation">.</span><span class="token function">getUrl</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> username<span class="token punctuation">,</span> password<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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conn<span class="token punctuation">.</span><span class="token function">setCheckoutTimestamp</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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conn<span class="token punctuation">.</span><span class="token function">setLastUsedTimestamp</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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state<span class="token punctuation">.</span>activeConnections<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>conn<span class="token punctuation">)</span><span class="token punctuation">;</span>
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state<span class="token punctuation">.</span>requestCount<span class="token operator">++</span><span class="token punctuation">;</span>
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state<span class="token punctuation">.</span>accumulatedRequestTime <span class="token operator">+=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> t<span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"A bad connection ("</span> <span class="token operator">+</span> conn<span class="token punctuation">.</span><span class="token function">getRealHashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">") was returned from the pool, getting another connection."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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state<span class="token punctuation">.</span>badConnectionCount<span class="token operator">++</span><span class="token punctuation">;</span>
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localBadConnectionCount<span class="token operator">++</span><span class="token punctuation">;</span>
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conn <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>localBadConnectionCount <span class="token operator">></span> <span class="token punctuation">(</span>poolMaximumIdleConnections <span class="token operator">+</span> poolMaximumLocalBadConnectionTolerance<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"PooledDataSource: Could not get a good connection to the database."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">SQLException</span><span class="token punctuation">(</span><span class="token string">"PooledDataSource: Could not get a good connection to the database."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
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lock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>conn <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"PooledDataSource: Unknown severe error condition. The connection pool returned a null connection."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">SQLException</span><span class="token punctuation">(</span><span class="token string">"PooledDataSource: Unknown severe error condition. The connection pool returned a null connection."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">return</span> conn<span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>它的入口不是个get方法，而是pop，从含义来来讲就不一样<br><code>org.apache.ibatis.datasource.pooled.PooledDataSource#getConnection()</code><pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token class-name">Connection</span> <span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token function">popConnection</span><span class="token punctuation">(</span>dataSource<span class="token punctuation">.</span><span class="token function">getUsername</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> dataSource<span class="token punctuation">.</span><span class="token function">getPassword</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getProxyConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span></span></code></pre><p>对于具体怎么获取连接我们可以下一篇具体讲下</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/2023/01/01/mybatis%E7%B3%BB%E5%88%97-typeAliases%E7%B3%BB%E7%BB%9F/ 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=/2023/01/01/mybatis%E7%B3%BB%E5%88%97-typeAliases%E7%B3%BB%E7%BB%9F/ itemprop=url>mybatis系列-typeAliases系统</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：2023-01-01 20:07:42 / 修改时间：20:08:24" datetime=2023-01-01T20:07:42+08:00>2023-01-01</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/ itemprop=url rel=index><span itemprop=name>Java</span></a> </span>， <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/Mybatis/ itemprop=url rel=index><span itemprop=name>Mybatis</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title=mybatis系列-typeAliases系统 id=/2023/01/01/mybatis%E7%B3%BB%E5%88%97-typeAliases%E7%B3%BB%E7%BB%9F/ 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=/2023/01/01/mybatis%E7%B3%BB%E5%88%97-typeAliases%E7%B3%BB%E7%BB%9F/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/01/01/mybatis系列-typeAliases系统/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>其实前面已经聊到过这个概念，在mybatis的配置中，以及一些初始化逻辑都是用了typeAliases，<pre class="line-numbers language-markup" data-language=markup><code class=language-markup><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAliases</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Author<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>domain.blog.Author<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Blog<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>domain.blog.Blog<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Comment<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>domain.blog.Comment<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Post<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>domain.blog.Post<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Section<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>domain.blog.Section<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Tag<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>domain.blog.Tag<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>typeAliases</span><span class="token punctuation">></span></span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>可以在这里注册类型别名，然后在mybatis中配置使用时，可以简化这些类型的使用，其底层逻辑主要是一个map，<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">TypeAliasRegistry</span> <span class="token punctuation">{</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Class</span><span class="token punctuation"><</span><span class="token operator">?</span><span class="token punctuation">></span><span class="token punctuation">></span></span> typeAliases <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">HashMap</span><span class="token generics"><span class="token punctuation"><</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span></span></code></pre><p>以string作为key，class对象作为value，比如我们在一开始使用的配置文件<pre class="line-numbers language-markup" data-language=markup><code class=language-markup><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dataSource</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>POOLED<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>driver<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${driver}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>url<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${url}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${username}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${password}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dataSource</span><span class="token punctuation">></span></span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这里使用的dataSource是POOLED，那它肯定是个别名或者需要对应处理<br>而这个别名就是在Configuration的构造方法里初始化<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">Configuration</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"JDBC"</span><span class="token punctuation">,</span> <span class="token class-name">JdbcTransactionFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"MANAGED"</span><span class="token punctuation">,</span> <span class="token class-name">ManagedTransactionFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"JNDI"</span><span class="token punctuation">,</span> <span class="token class-name">JndiDataSourceFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"POOLED"</span><span class="token punctuation">,</span> <span class="token class-name">PooledDataSourceFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"UNPOOLED"</span><span class="token punctuation">,</span> <span class="token class-name">UnpooledDataSourceFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"PERPETUAL"</span><span class="token punctuation">,</span> <span class="token class-name">PerpetualCache</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"FIFO"</span><span class="token punctuation">,</span> <span class="token class-name">FifoCache</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"LRU"</span><span class="token punctuation">,</span> <span class="token class-name">LruCache</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"SOFT"</span><span class="token punctuation">,</span> <span class="token class-name">SoftCache</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"WEAK"</span><span class="token punctuation">,</span> <span class="token class-name">WeakCache</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"DB_VENDOR"</span><span class="token punctuation">,</span> <span class="token class-name">VendorDatabaseIdProvider</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"XML"</span><span class="token punctuation">,</span> <span class="token class-name">XMLLanguageDriver</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"RAW"</span><span class="token punctuation">,</span> <span class="token class-name">RawLanguageDriver</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"SLF4J"</span><span class="token punctuation">,</span> <span class="token class-name">Slf4jImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"COMMONS_LOGGING"</span><span class="token punctuation">,</span> <span class="token class-name">JakartaCommonsLoggingImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"LOG4J"</span><span class="token punctuation">,</span> <span class="token class-name">Log4jImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"LOG4J2"</span><span class="token punctuation">,</span> <span class="token class-name">Log4j2Impl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"JDK_LOGGING"</span><span class="token punctuation">,</span> <span class="token class-name">Jdk14LoggingImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"STDOUT_LOGGING"</span><span class="token punctuation">,</span> <span class="token class-name">StdOutImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"NO_LOGGING"</span><span class="token punctuation">,</span> <span class="token class-name">NoLoggingImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"CGLIB"</span><span class="token punctuation">,</span> <span class="token class-name">CglibProxyFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"JAVASSIST"</span><span class="token punctuation">,</span> <span class="token class-name">JavassistProxyFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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languageRegistry<span class="token punctuation">.</span><span class="token function">setDefaultDriverClass</span><span class="token punctuation">(</span><span class="token class-name">XMLLanguageDriver</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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languageRegistry<span class="token punctuation">.</span><span class="token function">register</span><span class="token punctuation">(</span><span class="token class-name">RawLanguageDriver</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>正是通过<code>typeAliasRegistry.registerAlias("POOLED", PooledDataSourceFactory.class);</code>这一行，注册了<br><code>POOLED</code>对应的别名类型是<code>PooledDataSourceFactory.class</code><br>具体的注册方法是在<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token class-name">String</span> alias<span class="token punctuation">,</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token operator">?</span><span class="token punctuation">></span></span> value<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>alias <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TypeException</span><span class="token punctuation">(</span><span class="token string">"The parameter alias cannot be null"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// issue #748</span>
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<span class="token comment">// 转换成小写，</span>
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<span class="token class-name">String</span> key <span class="token operator">=</span> alias<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token class-name">Locale</span><span class="token punctuation">.</span><span class="token constant">ENGLISH</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// 判断是否已经注册过了</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>typeAliases<span class="token punctuation">.</span><span class="token function">containsKey</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span> <span class="token operator">&&</span> typeAliases<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&&</span> <span class="token operator">!</span>typeAliases<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TypeException</span><span class="token punctuation">(</span><span class="token string">"The alias '"</span> <span class="token operator">+</span> alias <span class="token operator">+</span> <span class="token string">"' is already mapped to the value '"</span> <span class="token operator">+</span> typeAliases<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">"'."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span>
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<span class="token comment">// 放进map里</span>
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|
typeAliases<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> value<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而获取的逻辑在这<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token function">resolveAlias</span><span class="token punctuation">(</span><span class="token class-name">String</span> string<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">if</span> <span class="token punctuation">(</span>string <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token comment">// issue #748</span>
|
|
<span class="token comment">// 同样的转成小写</span>
|
|
<span class="token class-name">String</span> key <span class="token operator">=</span> string<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token class-name">Locale</span><span class="token punctuation">.</span><span class="token constant">ENGLISH</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span> value<span class="token punctuation">;</span>
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|
<span class="token keyword">if</span> <span class="token punctuation">(</span>typeAliases<span class="token punctuation">.</span><span class="token function">containsKey</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
value <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span><span class="token punctuation">)</span> typeAliases<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
|
|
<span class="token comment">// 这里还有从路径下处理的逻辑</span>
|
|
value <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span><span class="token punctuation">)</span> <span class="token class-name">Resources</span><span class="token punctuation">.</span><span class="token function">classForName</span><span class="token punctuation">(</span>string<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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|
<span class="token keyword">return</span> value<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">ClassNotFoundException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TypeException</span><span class="token punctuation">(</span><span class="token string">"Could not resolve type alias '"</span> <span class="token operator">+</span> string <span class="token operator">+</span> <span class="token string">"'. Cause: "</span> <span class="token operator">+</span> e<span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>逻辑比较简单，但是在mybatis中也是不可或缺的一块概念</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/2022/12/25/docker%E6%AF%94%E4%B8%80%E8%88%AC%E5%A4%9A%E4%B8%80%E7%82%B9%E7%9A%84%E5%88%9D%E5%AD%A6%E8%80%85%E4%BB%8B%E7%BB%8D%E5%9B%9B/ 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=/2022/12/25/docker%E6%AF%94%E4%B8%80%E8%88%AC%E5%A4%9A%E4%B8%80%E7%82%B9%E7%9A%84%E5%88%9D%E5%AD%A6%E8%80%85%E4%BB%8B%E7%BB%8D%E5%9B%9B/ itemprop=url>docker比一般多一点的初学者介绍四</a></h2><div class=post-meta-container><div class=post-meta><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar"></i> </span><span class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间：2022-12-25 19:40:28 / 修改时间：19:41:57" datetime=2022-12-25T19:40:28+08:00>2022-12-25</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/Docker/ itemprop=url rel=index><span itemprop=name>Docker</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title=docker比一般多一点的初学者介绍四 id=/2022/12/25/docker%E6%AF%94%E4%B8%80%E8%88%AC%E5%A4%9A%E4%B8%80%E7%82%B9%E7%9A%84%E5%88%9D%E5%AD%A6%E8%80%85%E4%BB%8B%E7%BB%8D%E5%9B%9B/ 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=/2022/12/25/docker%E6%AF%94%E4%B8%80%E8%88%AC%E5%A4%9A%E4%B8%80%E7%82%B9%E7%9A%84%E5%88%9D%E5%AD%A6%E8%80%85%E4%BB%8B%E7%BB%8D%E5%9B%9B/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2022/12/25/docker比一般多一点的初学者介绍四/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>这次单独介绍下docker体系里非常重要的cgroup，docker对资源的限制也是基于cgroup构建的，<br>简单尝试<br>新建一个shell脚本<pre class="line-numbers language-bash" data-language=bash><code class=language-bash><span class="token shebang important">#!/bin/bash</span>
|
|
<span class="token keyword">while</span> <span class="token boolean">true</span><span class="token punctuation">;</span><span class="token keyword">do</span>
|
|
<span class="token builtin class-name">echo</span> <span class="token string">"1"</span>
|
|
<span class="token keyword">done</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span></span></code></pre><p>直接执行的话就是单核100%的cpu<br><img data-src=https://img.nicksxs.com/blog/rFp7D1.jpg><p>首先在cgroup下面建个目录<pre class="line-numbers language-bash" data-language=bash><code class=language-bash><span class="token function">mkdir</span> <span class="token parameter variable">-p</span> /sys/fs/cgroup/cpu/sxs_test/<span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>查看目录下的文件<br><img data-src=https://img.nicksxs.com/blog/b6UwLR.jpg><br>其中cpuacct开头的表示cpu相关的统计信息，<br>我们要配置cpu的额度，是在cpu.cfs_quota_us中<pre class="line-numbers language-bash" data-language=bash><code class=language-bash><span class="token builtin class-name">echo</span> <span class="token number">2000</span> <span class="token operator">></span> /sys/fs/cgroup/cpu/sxs_test/cpu.cfs_quota_us <span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>这样表示可以使用2%的cpu，总的配额是在cpu.cfs_period_us中<br><img data-src=https://img.nicksxs.com/blog/oikqB8.png><p>然后将当前进程输入到cgroup.procs,<pre class="line-numbers language-bash" data-language=bash><code class=language-bash><span class="token builtin class-name">echo</span> <span class="token variable">$$</span> <span class="token operator">></span> /sys/fs/cgroup/cpu/sxs_test/cgroup.procs<span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>这样就会自动继承当前进程产生的新进程<br>再次执行就可以看到cpu被限制了<br><img data-src=https://img.nicksxs.com/blog/W0ptVg.png></div><footer class=post-footer><div class=post-eof></div></footer></article></div><nav class=pagination><span class="page-number current">1</span><a class=page-number href=/page/2/>2</a><span class=space>…</span><a class=page-number href=/page/39/>39</a><a class="extend next" aria-label=下一页 href=/page/2/ rel=next title=下一页><i class="fa 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