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</span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/ itemprop=url rel=index><span itemprop=name>Java</span></a> </span>, <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/SpringBoot/ itemprop=url rel=index><span itemprop=name>SpringBoot</span></a> </span>, <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/SpringBoot/Tomcat/ itemprop=url rel=index><span itemprop=name>Tomcat</span></a> </span></span><span class="post-meta-item cloudflare-page-counter" data-title="Tomcat 系列篇一-介绍下 connector" data-increment=true data-path=/2023/09/10/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E4%B8%80-%E4%BB%8B%E7%BB%8D%E4%B8%8B-connector/ 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=cloudflare-page-counter-count></span></span></div><div class=post-description>tomcat的主体架构里,connector 作为核心的连接器 这也是个架构的优化,将连接跟请求处理分开,可以适配各种连接协议 连接器的初始化逻辑,是在初始化 WebServer 的时候调用 org.springframework.boot.web.embedded.tomca…</div></div></header><div class=post-body itemprop=articleBody><p>tomcat的主体架构里,connector 作为核心的连接器<br><img loading=lazy src=https://img.nicksxs.me/blog/pMttov.png><br>这也是个架构的优化,将连接跟请求处理分开,可以适配各种连接协议<br>连接器的初始化逻辑,是在初始化 WebServer 的时候调用<br><code>org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory#getWebServer</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> WebServer <span class="title function_">getWebServer</span><span class=params>(ServletContextInitializer... initializers)</span> {</span><br><span class=line> <span class=keyword>if</span> (<span class=built_in>this</span>.disableMBeanRegistry) {</span><br><span class=line> Registry.disableRegistry();</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>Tomcat</span> <span class=variable>tomcat</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">Tomcat</span>();</span><br><span class=line> <span class=type>File</span> <span class=variable>baseDir</span> <span class=operator>=</span> <span class=built_in>this</span>.baseDirectory != <span class=literal>null</span> ? <span class=built_in>this</span>.baseDirectory : <span class=built_in>this</span>.createTempDir(<span class=string>"tomcat"</span>);</span><br><span class=line> tomcat.setBaseDir(baseDir.getAbsolutePath());</span><br><span class=line> <span class=comment>// 这里就是创建 Connector</span></span><br><span class=line> <span class=type>Connector</span> <span class=variable>connector</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">Connector</span>(<span class=built_in>this</span>.protocol);</span><br><span class=line> connector.setThrowOnFailure(<span class=literal>true</span>);</span><br><span class=line> tomcat.getService().addConnector(connector);</span><br><span class=line> <span class=built_in>this</span>.customizeConnector(connector);</span><br><span class=line> tomcat.setConnector(connector);</span><br></pre></table></figure><p>而 connector 中最重要的就是 <code>ProtocolHandler</code> ,初始化代码中<br><code>org.apache.catalina.connector.Connector#Connector(java.lang.String)</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class="title function_">Connector</span><span class=params>(String protocol)</span> {</span><br><span class=line> <span class=type>boolean</span> <span class=variable>apr</span> <span class=operator>=</span> AprStatus.getUseAprConnector() && AprStatus.isInstanceCreated()</span><br><span class=line> && AprLifecycleListener.isAprAvailable();</span><br><span class=line> <span class=type>ProtocolHandler</span> <span class=variable>p</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> p = ProtocolHandler.create(protocol, apr);</span><br><span class=line> } <span class=keyword>catch</span> (Exception e) {</span><br><span class=line> log.error(sm.getString(</span><br><span class=line> <span class=string>"coyoteConnector.protocolHandlerInstantiationFailed"</span>), e);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (p != <span class=literal>null</span>) {</span><br><span class=line> protocolHandler = p;</span><br><span class=line> protocolHandlerClassName = protocolHandler.getClass().getName();</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> protocolHandler = <span class=literal>null</span>;</span><br><span class=line> protocolHandlerClassName = protocol;</span><br><span class=line> }</span><br><span class=line> <span class=comment>// Default for Connector depends on this system property</span></span><br><span class=line> setThrowOnFailure(Boolean.getBoolean(<span class=string>"org.apache.catalina.startup.EXIT_ON_INIT_FAILURE"</span>));</span><br><span class=line> }</span><br></pre></table></figure><p>这里就调用了<br><code>org.apache.coyote.ProtocolHandler#create</code><br>根据协议来生成对应的,我们这里默认就是<br><code>org.apache.coyote.http11.Http11NioProtocol</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>static</span> ProtocolHandler <span class="title function_">create</span><span class=params>(String protocol, <span class=type>boolean</span> apr)</span></span><br><span class=line> <span class=keyword>throws</span> ClassNotFoundException, InstantiationException, IllegalAccessException,</span><br><span class=line> IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException {</span><br><span class=line> <span class=keyword>if</span> (protocol == <span class=literal>null</span> || <span class=string>"HTTP/1.1"</span>.equals(protocol)</span><br><span class=line> || (!apr && org.apache.coyote.http11.Http11NioProtocol.class.getName().equals(protocol))</span><br><span class=line> || (apr && org.apache.coyote.http11.Http11AprProtocol.class.getName().equals(protocol))) {</span><br><span class=line> <span class=keyword>if</span> (apr) {</span><br><span class=line> <span class=keyword>return</span> <span class=keyword>new</span> <span class="title class_">org</span>.apache.coyote.http11.Http11AprProtocol();</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> <span class=keyword>return</span> <span class=keyword>new</span> <span class="title class_">org</span>.apache.coyote.http11.Http11NioProtocol();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (<span class=string>"AJP/1.3"</span>.equals(protocol)</span><br><span class=line> || (!apr && org.apache.coyote.ajp.AjpNioProtocol.class.getName().equals(protocol))</span><br><span class=line> || (apr && org.apache.coyote.ajp.AjpAprProtocol.class.getName().equals(protocol))) {</span><br><span class=line> <span class=keyword>if</span> (apr) {</span><br><span class=line> <span class=keyword>return</span> <span class=keyword>new</span> <span class="title class_">org</span>.apache.coyote.ajp.AjpAprProtocol();</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> <span class=keyword>return</span> <span class=keyword>new</span> <span class="title class_">org</span>.apache.coyote.ajp.AjpNioProtocol();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> <span class=comment>// Instantiate protocol handler</span></span><br><span class=line> Class<?> clazz = Class.forName(protocol);</span><br><span class=line> <span class=keyword>return</span> (ProtocolHandler) clazz.getConstructor().newInstance();</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>而这个初始化就主要做的是初始化 <code>EndPoint</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class="title function_">Http11NioProtocol</span><span class=params>()</span> {</span><br><span class=line> <span class=built_in>super</span>(<span class=keyword>new</span> <span class="title class_">NioEndpoint</span>());</span><br><span class=line>}</span><br></pre></table></figure><p>这个调用父类的方法是调用的<br><code>org.apache.coyote.http11.AbstractHttp11Protocol#AbstractHttp11Protocol</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class="title function_">AbstractHttp11Protocol</span><span class=params>(AbstractEndpoint<S,?> endpoint)</span> {</span><br><span class=line> <span class=built_in>super</span>(endpoint);</span><br><span class=line> setConnectionTimeout(Constants.DEFAULT_CONNECTION_TIMEOUT);</span><br><span class=line> ConnectionHandler<S> cHandler = <span class=keyword>new</span> <span class="title class_">ConnectionHandler</span><>(<span class=built_in>this</span>);</span><br><span class=line> setHandler(cHandler);</span><br><span class=line> getEndpoint().setHandler(cHandler);</span><br><span class=line> }</span><br></pre></table></figure><p>而后在 Tomcat 启动后,在启动 connector 的时候<br>是在<code>StandardService</code> 添加 connector 时,启动了 connector<br><code>org.apache.catalina.core.StandardService#addConnector</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">addConnector</span><span class=params>(Connector connector)</span> {</span><br><span class=line></span><br><span class=line> <span class=keyword>synchronized</span> (connectorsLock) {</span><br><span class=line> connector.setService(<span class=built_in>this</span>);</span><br><span class=line> Connector results[] = <span class=keyword>new</span> <span class="title class_">Connector</span>[connectors.length + <span class=number>1</span>];</span><br><span class=line> System.arraycopy(connectors, <span class=number>0</span>, results, <span class=number>0</span>, connectors.length);</span><br><span class=line> results[connectors.length] = connector;</span><br><span class=line> connectors = results;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>if</span> (getState().isAvailable()) {</span><br><span class=line> connector.start();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (LifecycleException e) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">IllegalArgumentException</span>(</span><br><span class=line> sm.getString(<span class=string>"standardService.connector.startFailed"</span>, connector), e);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Report this property change to interested listeners</span></span><br><span class=line> support.firePropertyChange(<span class=string>"connector"</span>, <span class=literal>null</span>, connector);</span><br><span class=line> }</span><br></pre></table></figure><p>而后就会调用到 <code>Connector</code> 的 <code>initInternal</code> 方法<br><code>org.apache.catalina.connector.Connector#initInternal</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>protected</span> <span class=keyword>void</span> <span class="title function_">initInternal</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException {</span><br><span class=line></span><br><span class=line> <span class=built_in>super</span>.initInternal();</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (protocolHandler == <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(</span><br><span class=line> sm.getString(<span class=string>"coyoteConnector.protocolHandlerInstantiationFailed"</span>));</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Initialize adapter</span></span><br><span class=line> adapter = <span class=keyword>new</span> <span class="title class_">CoyoteAdapter</span>(<span class=built_in>this</span>);</span><br><span class=line> protocolHandler.setAdapter(adapter);</span><br><span class=line> <span class=keyword>if</span> (service != <span class=literal>null</span>) {</span><br><span class=line> protocolHandler.setUtilityExecutor(service.getServer().getUtilityExecutor());</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Make sure parseBodyMethodsSet has a default</span></span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == parseBodyMethodsSet) {</span><br><span class=line> setParseBodyMethods(getParseBodyMethods());</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (protocolHandler.isAprRequired() && !AprStatus.isInstanceCreated()) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(sm.getString(<span class=string>"coyoteConnector.protocolHandlerNoAprListener"</span>,</span><br><span class=line> getProtocolHandlerClassName()));</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (protocolHandler.isAprRequired() && !AprStatus.isAprAvailable()) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(sm.getString(<span class=string>"coyoteConnector.protocolHandlerNoAprLibrary"</span>,</span><br><span class=line> getProtocolHandlerClassName()));</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (AprStatus.isAprAvailable() && AprStatus.getUseOpenSSL() &&</span><br><span class=line> protocolHandler <span class=keyword>instanceof</span> AbstractHttp11JsseProtocol) {</span><br><span class=line> AbstractHttp11JsseProtocol<?> jsseProtocolHandler =</span><br><span class=line> (AbstractHttp11JsseProtocol<?>) protocolHandler;</span><br><span class=line> <span class=keyword>if</span> (jsseProtocolHandler.isSSLEnabled() &&</span><br><span class=line> jsseProtocolHandler.getSslImplementationName() == <span class=literal>null</span>) {</span><br><span class=line> <span class=comment>// OpenSSL is compatible with the JSSE configuration, so use it if APR is available</span></span><br><span class=line> jsseProtocolHandler.setSslImplementationName(OpenSSLImplementation.class.getName());</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> protocolHandler.init();</span><br><span class=line> } <span class=keyword>catch</span> (Exception e) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(</span><br><span class=line> sm.getString(<span class=string>"coyoteConnector.protocolHandlerInitializationFailed"</span>), e);</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>这里继续往下走就是 protocolHandler 的 init 方法<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">init</span><span class=params>()</span> <span class=keyword>throws</span> Exception {</span><br><span class=line> <span class=keyword>if</span> (getLog().isInfoEnabled()) {</span><br><span class=line> getLog().info(sm.getString(<span class=string>"abstractProtocolHandler.init"</span>, getName()));</span><br><span class=line> logPortOffset();</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (oname == <span class=literal>null</span>) {</span><br><span class=line> <span class=comment>// Component not pre-registered so register it</span></span><br><span class=line> oname = createObjectName();</span><br><span class=line> <span class=keyword>if</span> (oname != <span class=literal>null</span>) {</span><br><span class=line> Registry.getRegistry(<span class=literal>null</span>, <span class=literal>null</span>).registerComponent(<span class=built_in>this</span>, oname, <span class=literal>null</span>);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (<span class=built_in>this</span>.domain != <span class=literal>null</span>) {</span><br><span class=line> <span class=type>ObjectName</span> <span class=variable>rgOname</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">ObjectName</span>(domain + <span class=string>":type=GlobalRequestProcessor,name="</span> + getName());</span><br><span class=line> <span class=built_in>this</span>.rgOname = rgOname;</span><br><span class=line> Registry.getRegistry(<span class=literal>null</span>, <span class=literal>null</span>).registerComponent(</span><br><span class=line> getHandler().getGlobal(), rgOname, <span class=literal>null</span>);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>String</span> <span class=variable>endpointName</span> <span class=operator>=</span> getName();</span><br><span class=line> endpoint.setName(endpointName.substring(<span class=number>1</span>, endpointName.length()-<span class=number>1</span>));</span><br><span class=line> endpoint.setDomain(domain);</span><br><span class=line></span><br><span class=line> endpoint.init();</span><br><span class=line>}</span><br></pre></table></figure><p>看一下继承关系<br><img loading=lazy src=https://img.nicksxs.me/blog/fivtyf.png><br>然后就看到这里调用了 endpoint.init() ,走的也是父类的初始化方法,<br><code>org.apache.tomcat.util.net.AbstractEndpoint#init</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>final</span> <span class=keyword>void</span> <span class="title function_">init</span><span class=params>()</span> <span class=keyword>throws</span> Exception {</span><br><span class=line> <span class=keyword>if</span> (bindOnInit) {</span><br><span class=line> bindWithCleanup();</span><br><span class=line> bindState = BindState.BOUND_ON_INIT;</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (<span class=built_in>this</span>.domain != <span class=literal>null</span>) {</span><br><span class=line> <span class=comment>// Register endpoint (as ThreadPool - historical name)</span></span><br><span class=line> oname = <span class=keyword>new</span> <span class="title class_">ObjectName</span>(domain + <span class=string>":type=ThreadPool,name=\""</span> + getName() + <span class=string>"\""</span>);</span><br><span class=line> Registry.getRegistry(<span class=literal>null</span>, <span class=literal>null</span>).registerComponent(<span class=built_in>this</span>, oname, <span class=literal>null</span>);</span><br><span class=line></span><br><span class=line> <span class=type>ObjectName</span> <span class=variable>socketPropertiesOname</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">ObjectName</span>(domain +</span><br><span class=line> <span class=string>":type=SocketProperties,name=\""</span> + getName() + <span class=string>"\""</span>);</span><br><span class=line> socketProperties.setObjectName(socketPropertiesOname);</span><br><span class=line> Registry.getRegistry(<span class=literal>null</span>, <span class=literal>null</span>).registerComponent(socketProperties, socketPropertiesOname, <span class=literal>null</span>);</span><br><span class=line></span><br><span class=line> <span class=keyword>for</span> (SSLHostConfig sslHostConfig : findSslHostConfigs()) {</span><br><span class=line> registerJmx(sslHostConfig);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>然后接着调用了<br><code>org.apache.tomcat.util.net.AbstractEndpoint#bindWithCleanup</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br></pre><td class=code><pre><span class=line><span class=keyword>private</span> <span class=keyword>void</span> <span class="title function_">bindWithCleanup</span><span class=params>()</span> <span class=keyword>throws</span> Exception {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> bind();</span><br><span class=line> } <span class=keyword>catch</span> (Throwable t) {</span><br><span class=line> <span class=comment>// Ensure open sockets etc. are cleaned up if something goes</span></span><br><span class=line> <span class=comment>// wrong during bind</span></span><br><span class=line> ExceptionUtils.handleThrowable(t);</span><br><span class=line> unbind();</span><br><span class=line> <span class=keyword>throw</span> t;</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>这里的 bind 方法调用的是<br><code>org.apache.tomcat.util.net.NioEndpoint#bind</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">bind</span><span class=params>()</span> <span class=keyword>throws</span> Exception {</span><br><span class=line> initServerSocket();</span><br><span class=line></span><br><span class=line> setStopLatch(<span class=keyword>new</span> <span class="title class_">CountDownLatch</span>(<span class=number>1</span>));</span><br><span class=line></span><br><span class=line> <span class=comment>// Initialize SSL if needed</span></span><br><span class=line> initialiseSsl();</span><br><span class=line>}</span><br></pre></table></figure><p>这里的 initServerSocket是后面抽出来的,方便扩展,主要就是开启 ServerSocketChannel,绑定端口<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br></pre><td class=code><pre><span class=line><span class=comment>// Separated out to make it easier for folks that extend NioEndpoint to</span></span><br><span class=line> <span class=comment>// implement custom [server]sockets</span></span><br><span class=line> <span class=keyword>protected</span> <span class=keyword>void</span> <span class="title function_">initServerSocket</span><span class=params>()</span> <span class=keyword>throws</span> Exception {</span><br><span class=line> <span class=keyword>if</span> (getUseInheritedChannel()) {</span><br><span class=line> <span class=comment>// Retrieve the channel provided by the OS</span></span><br><span class=line> <span class=type>Channel</span> <span class=variable>ic</span> <span class=operator>=</span> System.inheritedChannel();</span><br><span class=line> <span class=keyword>if</span> (ic <span class=keyword>instanceof</span> ServerSocketChannel) {</span><br><span class=line> serverSock = (ServerSocketChannel) ic;</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (serverSock == <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">IllegalArgumentException</span>(sm.getString(<span class=string>"endpoint.init.bind.inherited"</span>));</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (getUnixDomainSocketPath() != <span class=literal>null</span>) {</span><br><span class=line> <span class=type>SocketAddress</span> <span class=variable>sa</span> <span class=operator>=</span> JreCompat.getInstance().getUnixDomainSocketAddress(getUnixDomainSocketPath());</span><br><span class=line> serverSock = JreCompat.getInstance().openUnixDomainServerSocketChannel();</span><br><span class=line> serverSock.bind(sa, getAcceptCount());</span><br><span class=line> <span class=keyword>if</span> (getUnixDomainSocketPathPermissions() != <span class=literal>null</span>) {</span><br><span class=line> <span class=type>Path</span> <span class=variable>path</span> <span class=operator>=</span> Paths.get(getUnixDomainSocketPath());</span><br><span class=line> Set<PosixFilePermission> permissions =</span><br><span class=line> PosixFilePermissions.fromString(getUnixDomainSocketPathPermissions());</span><br><span class=line> <span class=keyword>if</span> (path.getFileSystem().supportedFileAttributeViews().contains(<span class=string>"posix"</span>)) {</span><br><span class=line> FileAttribute<Set<PosixFilePermission>> attrs = PosixFilePermissions.asFileAttribute(permissions);</span><br><span class=line> Files.setAttribute(path, attrs.name(), attrs.value());</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> java.io.<span class=type>File</span> <span class=variable>file</span> <span class=operator>=</span> path.toFile();</span><br><span class=line> <span class=keyword>if</span> (permissions.contains(PosixFilePermission.OTHERS_READ) && !file.setReadable(<span class=literal>true</span>, <span class=literal>false</span>)) {</span><br><span class=line> log.warn(sm.getString(<span class=string>"endpoint.nio.perms.readFail"</span>, file.getPath()));</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (permissions.contains(PosixFilePermission.OTHERS_WRITE) && !file.setWritable(<span class=literal>true</span>, <span class=literal>false</span>)) {</span><br><span class=line> log.warn(sm.getString(<span class=string>"endpoint.nio.perms.writeFail"</span>, file.getPath()));</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> serverSock = ServerSocketChannel.open();</span><br><span class=line> socketProperties.setProperties(serverSock.socket());</span><br><span class=line> <span class=type>InetSocketAddress</span> <span class=variable>addr</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">InetSocketAddress</span>(getAddress(), getPortWithOffset());</span><br><span class=line> serverSock.bind(addr, getAcceptCount());</span><br><span class=line> }</span><br><span class=line> serverSock.configureBlocking(<span class=literal>true</span>); <span class=comment>//mimic APR behavior</span></span><br><span class=line> }</span><br></pre></table></figure><p>接着我们来看下 start 方法,这里多数是复用的 父类的方法<br><code>org.apache.tomcat.util.net.AbstractEndpoint#start</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>final</span> <span class=keyword>void</span> <span class="title function_">start</span><span class=params>()</span> <span class=keyword>throws</span> Exception {</span><br><span class=line> <span class=keyword>if</span> (bindState == BindState.UNBOUND) {</span><br><span class=line> bindWithCleanup();</span><br><span class=line> bindState = BindState.BOUND_ON_START;</span><br><span class=line> }</span><br><span class=line> startInternal();</span><br><span class=line> }</span><br></pre></table></figure><p>startInternal 才是 NioEndPoint 中的处理<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br></pre><td class=code><pre><span class=line><span class=comment>/**</span></span><br><span class=line><span class=comment> * Start the NIO endpoint, creating acceptor, poller threads.</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">startInternal</span><span class=params>()</span> <span class=keyword>throws</span> Exception {</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (!running) {</span><br><span class=line> running = <span class=literal>true</span>;</span><br><span class=line> paused = <span class=literal>false</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (socketProperties.getProcessorCache() != <span class=number>0</span>) {</span><br><span class=line> processorCache = <span class=keyword>new</span> <span class="title class_">SynchronizedStack</span><>(SynchronizedStack.DEFAULT_SIZE,</span><br><span class=line> socketProperties.getProcessorCache());</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (socketProperties.getEventCache() != <span class=number>0</span>) {</span><br><span class=line> eventCache = <span class=keyword>new</span> <span class="title class_">SynchronizedStack</span><>(SynchronizedStack.DEFAULT_SIZE,</span><br><span class=line> socketProperties.getEventCache());</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (socketProperties.getBufferPool() != <span class=number>0</span>) {</span><br><span class=line> nioChannels = <span class=keyword>new</span> <span class="title class_">SynchronizedStack</span><>(SynchronizedStack.DEFAULT_SIZE,</span><br><span class=line> socketProperties.getBufferPool());</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Create worker collection</span></span><br><span class=line> <span class=keyword>if</span> (getExecutor() == <span class=literal>null</span>) {</span><br><span class=line> createExecutor();</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> initializeConnectionLatch();</span><br><span class=line></span><br><span class=line> <span class=comment>// Start poller thread</span></span><br><span class=line> poller = <span class=keyword>new</span> <span class="title class_">Poller</span>();</span><br><span class=line> <span class=type>Thread</span> <span class=variable>pollerThread</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">Thread</span>(poller, getName() + <span class=string>"-Poller"</span>);</span><br><span class=line> pollerThread.setPriority(threadPriority);</span><br><span class=line> pollerThread.setDaemon(<span class=literal>true</span>);</span><br><span class=line> pollerThread.start();</span><br><span class=line></span><br><span class=line> startAcceptorThread();</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>上面是启动了一个 Poller 线程,在<code>startAcceptorThread</code> 里是启动了 acceptor<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br></pre><td class=code><pre><span class=line><span class=keyword>protected</span> <span class=keyword>void</span> <span class="title function_">startAcceptorThread</span><span class=params>()</span> {</span><br><span class=line> acceptor = <span class=keyword>new</span> <span class="title class_">Acceptor</span><>(<span class=built_in>this</span>);</span><br><span class=line> <span class=type>String</span> <span class=variable>threadName</span> <span class=operator>=</span> getName() + <span class=string>"-Acceptor"</span>;</span><br><span class=line> acceptor.setThreadName(threadName);</span><br><span class=line> <span class=type>Thread</span> <span class=variable>t</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">Thread</span>(acceptor, threadName);</span><br><span class=line> t.setPriority(getAcceptorThreadPriority());</span><br><span class=line> t.setDaemon(getDaemon());</span><br><span class=line> t.start();</span><br><span class=line> }</span><br></pre></table></figure><p>启动后运行的代码<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br><span class=line>59</span><br><span class=line>60</span><br><span class=line>61</span><br><span class=line>62</span><br><span class=line>63</span><br><span class=line>64</span><br><span class=line>65</span><br><span class=line>66</span><br><span class=line>67</span><br><span class=line>68</span><br><span class=line>69</span><br><span class=line>70</span><br><span class=line>71</span><br><span class=line>72</span><br><span class=line>73</span><br><span class=line>74</span><br><span class=line>75</span><br><span class=line>76</span><br><span class=line>77</span><br><span class=line>78</span><br><span class=line>79</span><br><span class=line>80</span><br><span class=line>81</span><br><span class=line>82</span><br><span class=line>83</span><br><span class=line>84</span><br><span class=line>85</span><br><span class=line>86</span><br><span class=line>87</span><br><span class=line>88</span><br><span class=line>89</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">run</span><span class=params>()</span> {</span><br><span class=line></span><br><span class=line> <span class=type>int</span> <span class=variable>errorDelay</span> <span class=operator>=</span> <span class=number>0</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>// Loop until we receive a shutdown command</span></span><br><span class=line> <span class=keyword>while</span> (!stopCalled) {</span><br><span class=line></span><br><span class=line> <span class=comment>// Loop if endpoint is paused</span></span><br><span class=line> <span class=keyword>while</span> (endpoint.isPaused() && !stopCalled) {</span><br><span class=line> state = AcceptorState.PAUSED;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> Thread.sleep(<span class=number>50</span>);</span><br><span class=line> } <span class=keyword>catch</span> (InterruptedException e) {</span><br><span class=line> <span class=comment>// Ignore</span></span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (stopCalled) {</span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line> state = AcceptorState.RUNNING;</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>//if we have reached max connections, wait</span></span><br><span class=line> endpoint.countUpOrAwaitConnection();</span><br><span class=line></span><br><span class=line> <span class=comment>// Endpoint might have been paused while waiting for latch</span></span><br><span class=line> <span class=comment>// If that is the case, don't accept new connections</span></span><br><span class=line> <span class=keyword>if</span> (endpoint.isPaused()) {</span><br><span class=line> <span class=keyword>continue</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>U</span> <span class=variable>socket</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>// Accept the next incoming connection from the server</span></span><br><span class=line> <span class=comment>// socket</span></span><br><span class=line> socket = endpoint.serverSocketAccept();</span><br><span class=line> } <span class=keyword>catch</span> (Exception ioe) {</span><br><span class=line> <span class=comment>// We didn't get a socket</span></span><br><span class=line> endpoint.countDownConnection();</span><br><span class=line> <span class=keyword>if</span> (endpoint.isRunning()) {</span><br><span class=line> <span class=comment>// Introduce delay if necessary</span></span><br><span class=line> errorDelay = handleExceptionWithDelay(errorDelay);</span><br><span class=line> <span class=comment>// re-throw</span></span><br><span class=line> <span class=keyword>throw</span> ioe;</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> <span class=comment>// Successful accept, reset the error delay</span></span><br><span class=line> errorDelay = <span class=number>0</span>;</span><br><span class=line></span><br><span class=line> <span class=comment>// Configure the socket</span></span><br><span class=line> <span class=keyword>if</span> (!stopCalled && !endpoint.isPaused()) {</span><br><span class=line> <span class=comment>// setSocketOptions() will hand the socket off to</span></span><br><span class=line> <span class=comment>// an appropriate processor if successful</span></span><br><span class=line> <span class=keyword>if</span> (!endpoint.setSocketOptions(socket)) {</span><br><span class=line> endpoint.closeSocket(socket);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> endpoint.destroySocket(socket);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (Throwable t) {</span><br><span class=line> ExceptionUtils.handleThrowable(t);</span><br><span class=line> <span class=type>String</span> <span class=variable>msg</span> <span class=operator>=</span> sm.getString(<span class=string>"endpoint.accept.fail"</span>);</span><br><span class=line> <span class=comment>// APR specific.</span></span><br><span class=line> <span class=comment>// Could push this down but not sure it is worth the trouble.</span></span><br><span class=line> <span class=keyword>if</span> (t <span class=keyword>instanceof</span> Error) {</span><br><span class=line> <span class=type>Error</span> <span class=variable>e</span> <span class=operator>=</span> (Error) t;</span><br><span class=line> <span class=keyword>if</span> (e.getError() == <span class=number>233</span>) {</span><br><span class=line> <span class=comment>// Not an error on HP-UX so log as a warning</span></span><br><span class=line> <span class=comment>// so it can be filtered out on that platform</span></span><br><span class=line> <span class=comment>// See bug 50273</span></span><br><span class=line> log.warn(msg, t);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> log.error(msg, t);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> log.error(msg, t);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> stopLatch.countDown();</span><br><span class=line> }</span><br><span class=line> state = AcceptorState.ENDED;</span><br><span class=line> }</span><br></pre></table></figure><p>这行<code>socket = endpoint.serverSocketAccept();</code>是 accept 等待线程进来,进来以后调用<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>protected</span> <span class=type>boolean</span> <span class="title function_">setSocketOptions</span><span class=params>(SocketChannel socket)</span> {</span><br><span class=line> <span class=type>NioSocketWrapper</span> <span class=variable>socketWrapper</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>// Allocate channel and wrapper</span></span><br><span class=line> <span class=type>NioChannel</span> <span class=variable>channel</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>if</span> (nioChannels != <span class=literal>null</span>) {</span><br><span class=line> channel = nioChannels.pop();</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (channel == <span class=literal>null</span>) {</span><br><span class=line> <span class=type>SocketBufferHandler</span> <span class=variable>bufhandler</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">SocketBufferHandler</span>(</span><br><span class=line> socketProperties.getAppReadBufSize(),</span><br><span class=line> socketProperties.getAppWriteBufSize(),</span><br><span class=line> socketProperties.getDirectBuffer());</span><br><span class=line> <span class=keyword>if</span> (isSSLEnabled()) {</span><br><span class=line> channel = <span class=keyword>new</span> <span class="title class_">SecureNioChannel</span>(bufhandler, <span class=built_in>this</span>);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> channel = <span class=keyword>new</span> <span class="title class_">NioChannel</span>(bufhandler);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> <span class=type>NioSocketWrapper</span> <span class=variable>newWrapper</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">NioSocketWrapper</span>(channel, <span class=built_in>this</span>);</span><br><span class=line> channel.reset(socket, newWrapper);</span><br><span class=line> connections.put(socket, newWrapper);</span><br><span class=line> socketWrapper = newWrapper;</span><br><span class=line></span><br><span class=line> <span class=comment>// Set socket properties</span></span><br><span class=line> <span class=comment>// Disable blocking, polling will be used</span></span><br><span class=line> socket.configureBlocking(<span class=literal>false</span>);</span><br><span class=line> <span class=keyword>if</span> (getUnixDomainSocketPath() == <span class=literal>null</span>) {</span><br><span class=line> socketProperties.setProperties(socket.socket());</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> socketWrapper.setReadTimeout(getConnectionTimeout());</span><br><span class=line> socketWrapper.setWriteTimeout(getConnectionTimeout());</span><br><span class=line> socketWrapper.setKeepAliveLeft(NioEndpoint.<span class=built_in>this</span>.getMaxKeepAliveRequests());</span><br><span class=line> poller.register(socketWrapper);</span><br><span class=line> <span class=keyword>return</span> <span class=literal>true</span>;</span><br><span class=line> } <span class=keyword>catch</span> (Throwable t) {</span><br><span class=line> ExceptionUtils.handleThrowable(t);</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> log.error(sm.getString(<span class=string>"endpoint.socketOptionsError"</span>), t);</span><br><span class=line> } <span class=keyword>catch</span> (Throwable tt) {</span><br><span class=line> ExceptionUtils.handleThrowable(tt);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (socketWrapper == <span class=literal>null</span>) {</span><br><span class=line> destroySocket(socket);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> <span class=comment>// Tell to close the socket if needed</span></span><br><span class=line> <span class=keyword>return</span> <span class=literal>false</span>;</span><br><span class=line> }</span><br></pre></table></figure><p>这里就是最重要的封装了 <code>NioSocketWrapper</code>, 然后注册到 Poller,<br>我们再来看 Poller 代码,注册其实是添加事件 event<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">register</span><span class=params>(<span class=keyword>final</span> NioSocketWrapper socketWrapper)</span> {</span><br><span class=line> socketWrapper.interestOps(SelectionKey.OP_READ);<span class=comment>//this is what OP_REGISTER turns into.</span></span><br><span class=line> <span class=type>PollerEvent</span> <span class=variable>event</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>if</span> (eventCache != <span class=literal>null</span>) {</span><br><span class=line> event = eventCache.pop();</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (event == <span class=literal>null</span>) {</span><br><span class=line> event = <span class=keyword>new</span> <span class="title class_">PollerEvent</span>(socketWrapper, OP_REGISTER);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> event.reset(socketWrapper, OP_REGISTER);</span><br><span class=line> }</span><br><span class=line> addEvent(event);</span><br><span class=line>}</span><br></pre></table></figure><p>然后Poller 的运行方法会处理这些 event<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br><span class=line>59</span><br><span class=line>60</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">run</span><span class=params>()</span> {</span><br><span class=line> <span class=comment>// Loop until destroy() is called</span></span><br><span class=line> <span class=keyword>while</span> (<span class=literal>true</span>) {</span><br><span class=line></span><br><span class=line> <span class=type>boolean</span> <span class=variable>hasEvents</span> <span class=operator>=</span> <span class=literal>false</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>if</span> (!close) {</span><br><span class=line> hasEvents = events();</span><br><span class=line> <span class=keyword>if</span> (wakeupCounter.getAndSet(-<span class=number>1</span>) > <span class=number>0</span>) {</span><br><span class=line> <span class=comment>// If we are here, means we have other stuff to do</span></span><br><span class=line> <span class=comment>// Do a non blocking select</span></span><br><span class=line> keyCount = selector.selectNow();</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> keyCount = selector.select(selectorTimeout);</span><br><span class=line> }</span><br><span class=line> wakeupCounter.set(<span class=number>0</span>);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (close) {</span><br><span class=line> events();</span><br><span class=line> timeout(<span class=number>0</span>, <span class=literal>false</span>);</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> selector.close();</span><br><span class=line> } <span class=keyword>catch</span> (IOException ioe) {</span><br><span class=line> log.error(sm.getString(<span class=string>"endpoint.nio.selectorCloseFail"</span>), ioe);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line> <span class=comment>// Either we timed out or we woke up, process events first</span></span><br><span class=line> <span class=keyword>if</span> (keyCount == <span class=number>0</span>) {</span><br><span class=line> hasEvents = (hasEvents | events());</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (Throwable x) {</span><br><span class=line> ExceptionUtils.handleThrowable(x);</span><br><span class=line> log.error(sm.getString(<span class=string>"endpoint.nio.selectorLoopError"</span>), x);</span><br><span class=line> <span class=keyword>continue</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> Iterator<SelectionKey> iterator =</span><br><span class=line> keyCount > <span class=number>0</span> ? selector.selectedKeys().iterator() : <span class=literal>null</span>;</span><br><span class=line> <span class=comment>// Walk through the collection of ready keys and dispatch</span></span><br><span class=line> <span class=comment>// any active event.</span></span><br><span class=line> <span class=keyword>while</span> (iterator != <span class=literal>null</span> && iterator.hasNext()) {</span><br><span class=line> <span class=type>SelectionKey</span> <span class=variable>sk</span> <span class=operator>=</span> iterator.next();</span><br><span class=line> iterator.remove();</span><br><span class=line> <span class=type>NioSocketWrapper</span> <span class=variable>socketWrapper</span> <span class=operator>=</span> (NioSocketWrapper) sk.attachment();</span><br><span class=line> <span class=comment>// Attachment may be null if another thread has called</span></span><br><span class=line> <span class=comment>// cancelledKey()</span></span><br><span class=line> <span class=keyword>if</span> (socketWrapper != <span class=literal>null</span>) {</span><br><span class=line> processKey(sk, socketWrapper);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Process timeouts</span></span><br><span class=line> timeout(keyCount,hasEvents);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> getStopLatch().countDown();</span><br><span class=line> }</span><br></pre></table></figure><p>如果 events 方法返回了 true 代表有事件,就会跑到<code>processKey(sk, socketWrapper);</code> 来处理这个事件<br>而这里的 processKey 也比较复杂,<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br></pre><td class=code><pre><span class=line><span class=keyword>protected</span> <span class=keyword>void</span> <span class="title function_">processKey</span><span class=params>(SelectionKey sk, NioSocketWrapper socketWrapper)</span> {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>if</span> (close) {</span><br><span class=line> cancelledKey(sk, socketWrapper);</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (sk.isValid()) {</span><br><span class=line> <span class=keyword>if</span> (sk.isReadable() || sk.isWritable()) {</span><br><span class=line> <span class=keyword>if</span> (socketWrapper.getSendfileData() != <span class=literal>null</span>) {</span><br><span class=line> processSendfile(sk, socketWrapper, <span class=literal>false</span>);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> unreg(sk, socketWrapper, sk.readyOps());</span><br><span class=line> <span class=type>boolean</span> <span class=variable>closeSocket</span> <span class=operator>=</span> <span class=literal>false</span>;</span><br><span class=line> <span class=comment>// Read goes before write</span></span><br><span class=line> <span class=keyword>if</span> (sk.isReadable()) {</span><br><span class=line> <span class=keyword>if</span> (socketWrapper.readOperation != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>if</span> (!socketWrapper.readOperation.process()) {</span><br><span class=line> closeSocket = <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (socketWrapper.readBlocking) {</span><br><span class=line> <span class=keyword>synchronized</span> (socketWrapper.readLock) {</span><br><span class=line> socketWrapper.readBlocking = <span class=literal>false</span>;</span><br><span class=line> socketWrapper.readLock.notify();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (!processSocket(socketWrapper, SocketEvent.OPEN_READ, <span class=literal>true</span>)) {</span><br><span class=line> closeSocket = <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (!closeSocket && sk.isWritable()) {</span><br><span class=line> <span class=keyword>if</span> (socketWrapper.writeOperation != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>if</span> (!socketWrapper.writeOperation.process()) {</span><br><span class=line> closeSocket = <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (socketWrapper.writeBlocking) {</span><br><span class=line> <span class=keyword>synchronized</span> (socketWrapper.writeLock) {</span><br><span class=line> socketWrapper.writeBlocking = <span class=literal>false</span>;</span><br><span class=line> socketWrapper.writeLock.notify();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (!processSocket(socketWrapper, SocketEvent.OPEN_WRITE, <span class=literal>true</span>)) {</span><br><span class=line> closeSocket = <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (closeSocket) {</span><br><span class=line> cancelledKey(sk, socketWrapper);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> <span class=comment>// Invalid key</span></span><br><span class=line> cancelledKey(sk, socketWrapper);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (CancelledKeyException ckx) {</span><br><span class=line> cancelledKey(sk, socketWrapper);</span><br><span class=line> } <span class=keyword>catch</span> (Throwable t) {</span><br><span class=line> ExceptionUtils.handleThrowable(t);</span><br><span class=line> log.error(sm.getString(<span class=string>"endpoint.nio.keyProcessingError"</span>), t);</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>正常请求回到这<br><code>else if (!processSocket(socketWrapper, SocketEvent.OPEN_READ, true))</code><br>然后调用<code>processSocket</code> 进行处理,<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=type>boolean</span> <span class="title function_">processSocket</span><span class=params>(SocketWrapperBase<S> socketWrapper,</span></span><br><span class=line><span class=params> SocketEvent event, <span class=type>boolean</span> dispatch)</span> {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>if</span> (socketWrapper == <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>return</span> <span class=literal>false</span>;</span><br><span class=line> }</span><br><span class=line> SocketProcessorBase<S> sc = <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>if</span> (processorCache != <span class=literal>null</span>) {</span><br><span class=line> sc = processorCache.pop();</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (sc == <span class=literal>null</span>) {</span><br><span class=line> sc = createSocketProcessor(socketWrapper, event);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> sc.reset(socketWrapper, event);</span><br><span class=line> }</span><br><span class=line> <span class=type>Executor</span> <span class=variable>executor</span> <span class=operator>=</span> getExecutor();</span><br><span class=line> <span class=keyword>if</span> (dispatch && executor != <span class=literal>null</span>) {</span><br><span class=line> executor.execute(sc);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> sc.run();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (RejectedExecutionException ree) {</span><br><span class=line> getLog().warn(sm.getString(<span class=string>"endpoint.executor.fail"</span>, socketWrapper) , ree);</span><br><span class=line> <span class=keyword>return</span> <span class=literal>false</span>;</span><br><span class=line> } <span class=keyword>catch</span> (Throwable t) {</span><br><span class=line> ExceptionUtils.handleThrowable(t);</span><br><span class=line> <span class=comment>// This means we got an OOM or similar creating a thread, or that</span></span><br><span class=line> <span class=comment>// the pool and its queue are full</span></span><br><span class=line> getLog().error(sm.getString(<span class=string>"endpoint.process.fail"</span>), t);</span><br><span class=line> <span class=keyword>return</span> <span class=literal>false</span>;</span><br><span class=line> }</span><br><span class=line> <span class=keyword>return</span> <span class=literal>true</span>;</span><br><span class=line> }</span><br></pre></table></figure><p>这里就会调用 <code>createSocketProcessor</code> 进行处理了,不过这是下一篇的内容了。</div><footer class=post-footer><div class="affiliate-creative affiliate-creative--post-end" data-affiliate-id=tencent-cloud-general><a rel="sponsored noopener" aria-label=腾讯云产品优惠 href=https://cloud.tencent.com/act/cps/redirect?redirect=2446&cps_key=2e33a1eedb380997d03618b4a5ba6ca7&from=console target=_blank><img alt=腾讯云服务器、数据库和云产品优惠 decoding=async height=419 loading=lazy src=/uploads/affiliate/tencent-cloud-general.webp width=690> </a><span class=affiliate-disclosure>推广</span></div><div class=reward-container><div>请我一杯咖啡吧!</div><button>赞赏</button><div class=post-reward><div><img alt="Nicksxs 微信" src=https://i.loli.net/2020/01/12/NUlWanT31E8LQGx.png><span>微信</span></div><div><img alt="Nicksxs 支付宝" src=https://ooo.0o0.ooo/2016/08/17/57b421e773057.jpg><span>支付宝</span></div></div></div><div class=post-copyright><ul><li 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