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1239 lines
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,
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,
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<p>很快2020 年就过了一半了，而且是今年这么特殊的一年，很多事情都发生的出乎意料，疫情这个绕不过去的话题，之前写了点比较愤青的文字，感觉不太适合发出来就烂在草稿箱里吧，这个目前一大影响估计是今年都没办法完全摘下口罩了，前面几个月来回杭州都开车，因为彭埠大桥不通行了，实在是非常不方便，每条路都灰常堵，心累，吐槽下杭州的交通规划和交警同志，工作实在做的不咋地。</p>
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<p>另外一件是就是蜗壳，从前不知道黝黑蜗壳是啥意思，只是经常会在他的视频里看到，大学的时候在缘网下了一个集锦，炒鸡帅气，各种空接扣篮，越来越能明白那句“你永远不知道意外和明天不知道哪个会先来,且行且珍惜”的含义，只是听了很多道理，依然活不好这一生，知易行难，王阳明真的是这方面的大师，有空可以看看这方面的书，一直想写写我跟篮球跟蜗壳的这十几年，争取能早日写好吧，不过得找个静得下来的时候写。</p>
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<p>正事方面上半年还是挺让人失望的，没有达成一些目标，应该还是能力不足吧，技术方面分析一下还是停留在看的表面层，有些实操的，或者结合业务场景的能力不太行，算是在坚持写写 blog，主要是被这个每周一篇的目标推着走，有时会比较焦虑，内容产出也还比较差，希望能在后面有些改善，可能会降低频率，只是觉得降低了也不一定能有比较好的提升，无法战胜自己的惰性，所以暂时还是坚持下这个目标吧，还有就是 coding 能力，有时候也应该刷刷题，提升思维敏捷度，大脑用太少可能生锈了，况且本来就不是很有优势，虽然失望也只能继续努力吧，日拱一卒，来日方长，加油吧~😔</p>
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<p>还有就是跑步减肥了，截止今天，上半年跑了 136 公里了，因为疫情影响，农历年后是从 4 月 17 号开始跑的，去年跑到了 300 公里，奖励自己了一个手表（真的挺后悔的，还不如 200 块买个手表），今年希望可以能在这个基础上再进一步，一直跟领导说，跑步算是我坚持下来的唯一一个好习惯了，618 买了个跑步机，周末回家了可以不受天气影响的多跑跑，不过如果天气好可能还是会出去跑跑，跑步机跑道多少还是有点拘束，只是感觉可能是我还是吃得太多了🤦♂️，效果不是很明显，还在 80 这个坎徘徊，等于浪费了大半年，可能是年初的项目太费心力，压力比较大，吃得更多，是不是可以算工伤😄，这方面也需要好好调整，可以放得开一点，虽然不太可能一下子到位，但是总要去努力下，随着年龄成长总要承担更多，也要看得开一点，没法事事如愿，尽力就好了，减肥这个事情还在结合一些俯卧撑啥的，希望也能坚持下去，加油吧，不知道原话怎么说的，意思是人类最大的勇敢就是看透了人世间的苦难，仍然热爱生活。我当然没可能让内心变得这么强大，试着去努力吧，奥力给！</p>
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<p>前面介绍了，nameserver相当于dubbo的注册中心，用与管理broker，broker会在启动的时候注册到nameserver，并且会发送心跳给namaserver，nameserver负责保存活跃的broker，包括master和slave，同时保存topic和topic下的队列，以及filter列表，然后为producer和consumer的请求提供服务。</p>
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<h3 id="启动过程"><a href="#启动过程" class="headerlink" title="启动过程"></a>启动过程</h3><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><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> main0(args);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> NamesrvController <span class="title">main0</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> NamesrvController controller = createNamesrvController(args);</span><br><span class="line"> start(controller);</span><br><span class="line"> String tip = <span class="string">"The Name Server boot success. serializeType="</span> + RemotingCommand.getSerializeTypeConfigInThisServer();</span><br><span class="line"> log.info(tip);</span><br><span class="line"> System.out.printf(<span class="string">"%s%n"</span>, tip);</span><br><span class="line"> <span class="keyword">return</span> controller;</span><br><span class="line"> } <span class="keyword">catch</span> (Throwable e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> System.exit(-<span class="number">1</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>入口的代码时这样子，其实主要的逻辑在createNamesrvController和start方法，来看下这两个的实现</p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> NamesrvController <span class="title">createNamesrvController</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> IOException, JoranException </span>{</span><br><span class="line"> System.setProperty(RemotingCommand.REMOTING_VERSION_KEY, Integer.toString(MQVersion.CURRENT_VERSION));</span><br><span class="line"> <span class="comment">//PackageConflictDetect.detectFastjson();</span></span><br><span class="line"></span><br><span class="line"> Options options = ServerUtil.buildCommandlineOptions(<span class="keyword">new</span> Options());</span><br><span class="line"> commandLine = ServerUtil.parseCmdLine(<span class="string">"mqnamesrv"</span>, args, buildCommandlineOptions(options), <span class="keyword">new</span> PosixParser());</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == commandLine) {</span><br><span class="line"> System.exit(-<span class="number">1</span>);</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">final</span> NamesrvConfig namesrvConfig = <span class="keyword">new</span> NamesrvConfig();</span><br><span class="line"> <span class="keyword">final</span> NettyServerConfig nettyServerConfig = <span class="keyword">new</span> NettyServerConfig();</span><br><span class="line"> nettyServerConfig.setListenPort(<span class="number">9876</span>);</span><br><span class="line"> <span class="keyword">if</span> (commandLine.hasOption(<span class="string">'c'</span>)) {</span><br><span class="line"> String file = commandLine.getOptionValue(<span class="string">'c'</span>);</span><br><span class="line"> <span class="keyword">if</span> (file != <span class="keyword">null</span>) {</span><br><span class="line"> InputStream in = <span class="keyword">new</span> BufferedInputStream(<span class="keyword">new</span> FileInputStream(file));</span><br><span class="line"> properties = <span class="keyword">new</span> Properties();</span><br><span class="line"> properties.load(in);</span><br><span class="line"> MixAll.properties2Object(properties, namesrvConfig);</span><br><span class="line"> MixAll.properties2Object(properties, nettyServerConfig);</span><br><span class="line"></span><br><span class="line"> namesrvConfig.setConfigStorePath(file);</span><br><span class="line"></span><br><span class="line"> System.out.printf(<span class="string">"load config properties file OK, %s%n"</span>, file);</span><br><span class="line"> in.close();</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> (commandLine.hasOption(<span class="string">'p'</span>)) {</span><br><span class="line"> InternalLogger console = InternalLoggerFactory.getLogger(LoggerName.NAMESRV_CONSOLE_NAME);</span><br><span class="line"> MixAll.printObjectProperties(console, namesrvConfig);</span><br><span class="line"> MixAll.printObjectProperties(console, nettyServerConfig);</span><br><span class="line"> System.exit(<span class="number">0</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> MixAll.properties2Object(ServerUtil.commandLine2Properties(commandLine), namesrvConfig);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == namesrvConfig.getRocketmqHome()) {</span><br><span class="line"> System.out.printf(<span class="string">"Please set the %s variable in your environment to match the location of the RocketMQ installation%n"</span>, MixAll.ROCKETMQ_HOME_ENV);</span><br><span class="line"> System.exit(-<span class="number">2</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();</span><br><span class="line"> JoranConfigurator configurator = <span class="keyword">new</span> JoranConfigurator();</span><br><span class="line"> configurator.setContext(lc);</span><br><span class="line"> lc.reset();</span><br><span class="line"> configurator.doConfigure(namesrvConfig.getRocketmqHome() + <span class="string">"/conf/logback_namesrv.xml"</span>);</span><br><span class="line"></span><br><span class="line"> log = InternalLoggerFactory.getLogger(LoggerName.NAMESRV_LOGGER_NAME);</span><br><span class="line"></span><br><span class="line"> MixAll.printObjectProperties(log, namesrvConfig);</span><br><span class="line"> MixAll.printObjectProperties(log, nettyServerConfig);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">final</span> NamesrvController controller = <span class="keyword">new</span> NamesrvController(namesrvConfig, nettyServerConfig);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// remember all configs to prevent discard</span></span><br><span class="line"> controller.getConfiguration().registerConfig(properties);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> controller;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>这个方法里其实主要是读取一些配置啥的，不是很复杂，</p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> NamesrvController <span class="title">start</span><span class="params">(<span class="keyword">final</span> NamesrvController controller)</span> <span class="keyword">throws</span> Exception </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == controller) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(<span class="string">"NamesrvController is null"</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">boolean</span> initResult = controller.initialize();</span><br><span class="line"> <span class="keyword">if</span> (!initResult) {</span><br><span class="line"> controller.shutdown();</span><br><span class="line"> System.exit(-<span class="number">3</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> Runtime.getRuntime().addShutdownHook(<span class="keyword">new</span> ShutdownHookThread(log, <span class="keyword">new</span> Callable<Void>() {</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Void <span class="title">call</span><span class="params">()</span> <span class="keyword">throws</span> Exception </span>{</span><br><span class="line"> controller.shutdown();</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line"> }</span><br><span class="line"> }));</span><br><span class="line"></span><br><span class="line"> controller.start();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> controller;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>这个start里主要关注initialize方法，后面就是一个停机的hook，来看下initialize方法</p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">initialize</span><span class="params">()</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.kvConfigManager.load();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.remotingServer = <span class="keyword">new</span> NettyRemotingServer(<span class="keyword">this</span>.nettyServerConfig, <span class="keyword">this</span>.brokerHousekeepingService);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.remotingExecutor =</span><br><span class="line"> Executors.newFixedThreadPool(nettyServerConfig.getServerWorkerThreads(), <span class="keyword">new</span> ThreadFactoryImpl(<span class="string">"RemotingExecutorThread_"</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.registerProcessor();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() {</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</span><br><span class="line"> NamesrvController.<span class="keyword">this</span>.routeInfoManager.scanNotActiveBroker();</span><br><span class="line"> }</span><br><span class="line"> }, <span class="number">5</span>, <span class="number">10</span>, TimeUnit.SECONDS);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() {</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</span><br><span class="line"> NamesrvController.<span class="keyword">this</span>.kvConfigManager.printAllPeriodically();</span><br><span class="line"> }</span><br><span class="line"> }, <span class="number">1</span>, <span class="number">10</span>, TimeUnit.MINUTES);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (TlsSystemConfig.tlsMode != TlsMode.DISABLED) {</span><br><span class="line"> <span class="comment">// Register a listener to reload SslContext</span></span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> fileWatchService = <span class="keyword">new</span> FileWatchService(</span><br><span class="line"> <span class="keyword">new</span> String[] {</span><br><span class="line"> TlsSystemConfig.tlsServerCertPath,</span><br><span class="line"> TlsSystemConfig.tlsServerKeyPath,</span><br><span class="line"> TlsSystemConfig.tlsServerTrustCertPath</span><br><span class="line"> },</span><br><span class="line"> <span class="keyword">new</span> FileWatchService.Listener() {</span><br><span class="line"> <span class="keyword">boolean</span> certChanged, keyChanged = <span class="keyword">false</span>;</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onChanged</span><span class="params">(String path)</span> </span>{</span><br><span class="line"> <span class="keyword">if</span> (path.equals(TlsSystemConfig.tlsServerTrustCertPath)) {</span><br><span class="line"> log.info(<span class="string">"The trust certificate changed, reload the ssl context"</span>);</span><br><span class="line"> reloadServerSslContext();</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (path.equals(TlsSystemConfig.tlsServerCertPath)) {</span><br><span class="line"> certChanged = <span class="keyword">true</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (path.equals(TlsSystemConfig.tlsServerKeyPath)) {</span><br><span class="line"> keyChanged = <span class="keyword">true</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (certChanged && keyChanged) {</span><br><span class="line"> log.info(<span class="string">"The certificate and private key changed, reload the ssl context"</span>);</span><br><span class="line"> certChanged = keyChanged = <span class="keyword">false</span>;</span><br><span class="line"> reloadServerSslContext();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">reloadServerSslContext</span><span class="params">()</span> </span>{</span><br><span class="line"> ((NettyRemotingServer) remotingServer).loadSslContext();</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> log.warn(<span class="string">"FileWatchService created error, can't load the certificate dynamically"</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>这里的kvConfigManager主要是来加载NameServer的配置参数，存到org.apache.rocketmq.namesrv.kvconfig.KVConfigManager#configTable中，然后是以BrokerHousekeepingService对象为参数初始化NettyRemotingServer对象，BrokerHousekeepingService对象作为该Netty连接中Socket链接的监听器（ChannelEventListener）；监听与Broker建立的渠道的状态（空闲、关闭、异常三个状态），并调用BrokerHousekeepingService的相应onChannel方法。其中渠道的空闲、关闭、异常状态均调用RouteInfoManager.onChannelDestory方法处理。这个BrokerHousekeepingService可以字面化地理解为broker的管家服务，这个类内部三个状态方法其实都是调用的org.apache.rocketmq.namesrv.NamesrvController#getRouteInfoManager方法，而这个RouteInfoManager里面的对象有这些</p>
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<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><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">RouteInfoManager</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> InternalLogger log = InternalLoggerFactory.getLogger(LoggerName.NAMESRV_LOGGER_NAME);</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> <span class="keyword">static</span> <span class="keyword">long</span> BROKER_CHANNEL_EXPIRED_TIME = <span class="number">1000</span> * <span class="number">60</span> * <span class="number">2</span>;</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> ReadWriteLock lock = <span class="keyword">new</span> ReentrantReadWriteLock();</span><br><span class="line"> <span class="comment">// topic与queue的对应关系</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> HashMap<String<span class="comment">/* topic */</span>, List<QueueData>> topicQueueTable;</span><br><span class="line"> <span class="comment">// Broker名称与broker属性的map</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> HashMap<String<span class="comment">/* brokerName */</span>, BrokerData> brokerAddrTable;</span><br><span class="line"> <span class="comment">// 集群与broker集合的对应关系</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> HashMap<String<span class="comment">/* clusterName */</span>, Set<String<span class="comment">/* brokerName */</span>>> clusterAddrTable;</span><br><span class="line"> <span class="comment">// 活跃的broker信息</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> HashMap<String<span class="comment">/* brokerAddr */</span>, BrokerLiveInfo> brokerLiveTable;</span><br><span class="line"> <span class="comment">// Broker地址与过滤器</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> HashMap<String<span class="comment">/* brokerAddr */</span>, List<String><span class="comment">/* Filter Server */</span>> filterServerTable;</span><br></pre></td></tr></table></figure>
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<p>然后接下去就是初始化了一个线程池，然后注册默认的处理类<code>this.registerProcessor();</code>默认都是这个处理器去处理请求 <code>org.apache.rocketmq.namesrv.processor.DefaultRequestProcessor#DefaultRequestProcessor</code>然后是初始化两个定时任务</p>
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<p>第一是每10秒检查一遍Broker的状态的定时任务，调用scanNotActiveBroker方法；遍历brokerLiveTable集合，查看每个broker的最后更新时间（BrokerLiveInfo.lastUpdateTimestamp）是否超过2分钟，若超过则关闭该broker的渠道并调用RouteInfoManager.onChannelDestory方法清理RouteInfoManager类的topicQueueTable、brokerAddrTable、clusterAddrTable、filterServerTable成员变量。</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() {</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</span><br><span class="line"> NamesrvController.<span class="keyword">this</span>.routeInfoManager.scanNotActiveBroker();</span><br><span class="line"> }</span><br><span class="line"> }, <span class="number">5</span>, <span class="number">10</span>, TimeUnit.SECONDS);</span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">scanNotActiveBroker</span><span class="params">()</span> </span>{</span><br><span class="line"> Iterator<Entry<String, BrokerLiveInfo>> it = <span class="keyword">this</span>.brokerLiveTable.entrySet().iterator();</span><br><span class="line"> <span class="keyword">while</span> (it.hasNext()) {</span><br><span class="line"> Entry<String, BrokerLiveInfo> next = it.next();</span><br><span class="line"> <span class="keyword">long</span> last = next.getValue().getLastUpdateTimestamp();</span><br><span class="line"> <span class="keyword">if</span> ((last + BROKER_CHANNEL_EXPIRED_TIME) < System.currentTimeMillis()) {</span><br><span class="line"> RemotingUtil.closeChannel(next.getValue().getChannel());</span><br><span class="line"> it.remove();</span><br><span class="line"> log.warn(<span class="string">"The broker channel expired, {} {}ms"</span>, next.getKey(), BROKER_CHANNEL_EXPIRED_TIME);</span><br><span class="line"> <span class="keyword">this</span>.onChannelDestroy(next.getKey(), next.getValue().getChannel());</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onChannelDestroy</span><span class="params">(String remoteAddr, Channel channel)</span> </span>{</span><br><span class="line"> String brokerAddrFound = <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">if</span> (channel != <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">this</span>.lock.readLock().lockInterruptibly();</span><br><span class="line"> Iterator<Entry<String, BrokerLiveInfo>> itBrokerLiveTable =</span><br><span class="line"> <span class="keyword">this</span>.brokerLiveTable.entrySet().iterator();</span><br><span class="line"> <span class="keyword">while</span> (itBrokerLiveTable.hasNext()) {</span><br><span class="line"> Entry<String, BrokerLiveInfo> entry = itBrokerLiveTable.next();</span><br><span class="line"> <span class="keyword">if</span> (entry.getValue().getChannel() == channel) {</span><br><span class="line"> brokerAddrFound = entry.getKey();</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="keyword">finally</span> {</span><br><span class="line"> <span class="keyword">this</span>.lock.readLock().unlock();</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> log.error(<span class="string">"onChannelDestroy Exception"</span>, e);</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="keyword">null</span> == brokerAddrFound) {</span><br><span class="line"> brokerAddrFound = remoteAddr;</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> log.info(<span class="string">"the broker's channel destroyed, {}, clean it's data structure at once"</span>, brokerAddrFound);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (brokerAddrFound != <span class="keyword">null</span> && brokerAddrFound.length() > <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="keyword">try</span> {</span><br><span class="line"> <span class="keyword">this</span>.lock.writeLock().lockInterruptibly();</span><br><span class="line"> <span class="keyword">this</span>.brokerLiveTable.remove(brokerAddrFound);</span><br><span class="line"> <span class="keyword">this</span>.filterServerTable.remove(brokerAddrFound);</span><br><span class="line"> String brokerNameFound = <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">boolean</span> removeBrokerName = <span class="keyword">false</span>;</span><br><span class="line"> Iterator<Entry<String, BrokerData>> itBrokerAddrTable =</span><br><span class="line"> <span class="keyword">this</span>.brokerAddrTable.entrySet().iterator();</span><br><span class="line"> <span class="keyword">while</span> (itBrokerAddrTable.hasNext() && (<span class="keyword">null</span> == brokerNameFound)) {</span><br><span class="line"> BrokerData brokerData = itBrokerAddrTable.next().getValue();</span><br><span class="line"></span><br><span class="line"> Iterator<Entry<Long, String>> it = brokerData.getBrokerAddrs().entrySet().iterator();</span><br><span class="line"> <span class="keyword">while</span> (it.hasNext()) {</span><br><span class="line"> Entry<Long, String> entry = it.next();</span><br><span class="line"> Long brokerId = entry.getKey();</span><br><span class="line"> String brokerAddr = entry.getValue();</span><br><span class="line"> <span class="keyword">if</span> (brokerAddr.equals(brokerAddrFound)) {</span><br><span class="line"> brokerNameFound = brokerData.getBrokerName();</span><br><span class="line"> it.remove();</span><br><span class="line"> log.info(<span class="string">"remove brokerAddr[{}, {}] from brokerAddrTable, because channel destroyed"</span>,</span><br><span class="line"> brokerId, brokerAddr);</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><br><span class="line"> <span class="keyword">if</span> (brokerData.getBrokerAddrs().isEmpty()) {</span><br><span class="line"> removeBrokerName = <span class="keyword">true</span>;</span><br><span class="line"> itBrokerAddrTable.remove();</span><br><span class="line"> log.info(<span class="string">"remove brokerName[{}] from brokerAddrTable, because channel destroyed"</span>,</span><br><span class="line"> brokerData.getBrokerName());</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> (brokerNameFound != <span class="keyword">null</span> && removeBrokerName) {</span><br><span class="line"> Iterator<Entry<String, Set<String>>> it = <span class="keyword">this</span>.clusterAddrTable.entrySet().iterator();</span><br><span class="line"> <span class="keyword">while</span> (it.hasNext()) {</span><br><span class="line"> Entry<String, Set<String>> entry = it.next();</span><br><span class="line"> String clusterName = entry.getKey();</span><br><span class="line"> Set<String> brokerNames = entry.getValue();</span><br><span class="line"> <span class="keyword">boolean</span> removed = brokerNames.remove(brokerNameFound);</span><br><span class="line"> <span class="keyword">if</span> (removed) {</span><br><span class="line"> log.info(<span class="string">"remove brokerName[{}], clusterName[{}] from clusterAddrTable, because channel destroyed"</span>,</span><br><span class="line"> brokerNameFound, clusterName);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (brokerNames.isEmpty()) {</span><br><span class="line"> log.info(<span class="string">"remove the clusterName[{}] from clusterAddrTable, because channel destroyed and no broker in this cluster"</span>,</span><br><span class="line"> clusterName);</span><br><span class="line"> it.remove();</span><br><span class="line"> }</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><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (removeBrokerName) {</span><br><span class="line"> Iterator<Entry<String, List<QueueData>>> itTopicQueueTable =</span><br><span class="line"> <span class="keyword">this</span>.topicQueueTable.entrySet().iterator();</span><br><span class="line"> <span class="keyword">while</span> (itTopicQueueTable.hasNext()) {</span><br><span class="line"> Entry<String, List<QueueData>> entry = itTopicQueueTable.next();</span><br><span class="line"> String topic = entry.getKey();</span><br><span class="line"> List<QueueData> queueDataList = entry.getValue();</span><br><span class="line"></span><br><span class="line"> Iterator<QueueData> itQueueData = queueDataList.iterator();</span><br><span class="line"> <span class="keyword">while</span> (itQueueData.hasNext()) {</span><br><span class="line"> QueueData queueData = itQueueData.next();</span><br><span class="line"> <span class="keyword">if</span> (queueData.getBrokerName().equals(brokerNameFound)) {</span><br><span class="line"> itQueueData.remove();</span><br><span class="line"> log.info(<span class="string">"remove topic[{} {}], from topicQueueTable, because channel destroyed"</span>,</span><br><span class="line"> topic, queueData);</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> (queueDataList.isEmpty()) {</span><br><span class="line"> itTopicQueueTable.remove();</span><br><span class="line"> log.info(<span class="string">"remove topic[{}] all queue, from topicQueueTable, because channel destroyed"</span>,</span><br><span class="line"> topic);</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"> <span class="keyword">this</span>.lock.writeLock().unlock();</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> log.error(<span class="string">"onChannelDestroy Exception"</span>, e);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>第二个是每10分钟打印一次NameServer的配置参数。即KVConfigManager.configTable变量的内容。</p>
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<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><td class="code"><pre><span class="line"><span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() {</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</span><br><span class="line"> NamesrvController.<span class="keyword">this</span>.kvConfigManager.printAllPeriodically();</span><br><span class="line"> }</span><br><span class="line"> }, <span class="number">1</span>, <span class="number">10</span>, TimeUnit.MINUTES);</span><br></pre></td></tr></table></figure>
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<p>然后这个初始化就差不多完成了，后面只需要把remotingServer start一下就好了</p>
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<h3 id="处理请求"><a href="#处理请求" class="headerlink" title="处理请求"></a>处理请求</h3><p>直接上代码，其实主体是swtich case去判断</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> RemotingCommand <span class="title">processRequest</span><span class="params">(ChannelHandlerContext ctx,</span></span></span><br><span class="line"><span class="function"><span class="params"> RemotingCommand request)</span> <span class="keyword">throws</span> RemotingCommandException </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (ctx != <span class="keyword">null</span>) {</span><br><span class="line"> log.debug(<span class="string">"receive request, {} {} {}"</span>,</span><br><span class="line"> request.getCode(),</span><br><span class="line"> RemotingHelper.parseChannelRemoteAddr(ctx.channel()),</span><br><span class="line"> request);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> <span class="keyword">switch</span> (request.getCode()) {</span><br><span class="line"> <span class="keyword">case</span> RequestCode.PUT_KV_CONFIG:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.putKVConfig(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.GET_KV_CONFIG:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.getKVConfig(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.DELETE_KV_CONFIG:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.deleteKVConfig(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.QUERY_DATA_VERSION:</span><br><span class="line"> <span class="keyword">return</span> queryBrokerTopicConfig(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.REGISTER_BROKER:</span><br><span class="line"> Version brokerVersion = MQVersion.value2Version(request.getVersion());</span><br><span class="line"> <span class="keyword">if</span> (brokerVersion.ordinal() >= MQVersion.Version.V3_0_11.ordinal()) {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.registerBrokerWithFilterServer(ctx, request);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.registerBroker(ctx, request);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">case</span> RequestCode.UNREGISTER_BROKER:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.unregisterBroker(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.GET_ROUTEINTO_BY_TOPIC:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.getRouteInfoByTopic(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.GET_BROKER_CLUSTER_INFO:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.getBrokerClusterInfo(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.WIPE_WRITE_PERM_OF_BROKER:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.wipeWritePermOfBroker(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.GET_ALL_TOPIC_LIST_FROM_NAMESERVER:</span><br><span class="line"> <span class="keyword">return</span> getAllTopicListFromNameserver(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.DELETE_TOPIC_IN_NAMESRV:</span><br><span class="line"> <span class="keyword">return</span> deleteTopicInNamesrv(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.GET_KVLIST_BY_NAMESPACE:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.getKVListByNamespace(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.GET_TOPICS_BY_CLUSTER:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.getTopicsByCluster(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.GET_SYSTEM_TOPIC_LIST_FROM_NS:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.getSystemTopicListFromNs(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.GET_UNIT_TOPIC_LIST:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.getUnitTopicList(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.GET_HAS_UNIT_SUB_TOPIC_LIST:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.getHasUnitSubTopicList(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.GET_HAS_UNIT_SUB_UNUNIT_TOPIC_LIST:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.getHasUnitSubUnUnitTopicList(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.UPDATE_NAMESRV_CONFIG:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.updateConfig(ctx, request);</span><br><span class="line"> <span class="keyword">case</span> RequestCode.GET_NAMESRV_CONFIG:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.getConfig(ctx, request);</span><br><span class="line"> <span class="keyword">default</span>:</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>以broker注册为例，</p>
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<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><td class="code"><pre><span class="line"><span class="keyword">case</span> RequestCode.REGISTER_BROKER:</span><br><span class="line"> Version brokerVersion = MQVersion.value2Version(request.getVersion());</span><br><span class="line"> <span class="keyword">if</span> (brokerVersion.ordinal() >= MQVersion.Version.V3_0_11.ordinal()) {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.registerBrokerWithFilterServer(ctx, request);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.registerBroker(ctx, request);</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>做了个简单的版本管理，我们看下前面一个的代码</p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> RemotingCommand <span class="title">registerBrokerWithFilterServer</span><span class="params">(ChannelHandlerContext ctx, RemotingCommand request)</span></span></span><br><span class="line"><span class="function"> <span class="keyword">throws</span> RemotingCommandException </span>{</span><br><span class="line"> <span class="keyword">final</span> RemotingCommand response = RemotingCommand.createResponseCommand(RegisterBrokerResponseHeader<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"> <span class="keyword">final</span> RegisterBrokerResponseHeader responseHeader = (RegisterBrokerResponseHeader) response.readCustomHeader();</span><br><span class="line"> <span class="keyword">final</span> RegisterBrokerRequestHeader requestHeader =</span><br><span class="line"> (RegisterBrokerRequestHeader) request.decodeCommandCustomHeader(RegisterBrokerRequestHeader<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (!checksum(ctx, request, requestHeader)) {</span><br><span class="line"> response.setCode(ResponseCode.SYSTEM_ERROR);</span><br><span class="line"> response.setRemark(<span class="string">"crc32 not match"</span>);</span><br><span class="line"> <span class="keyword">return</span> response;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> RegisterBrokerBody registerBrokerBody = <span class="keyword">new</span> RegisterBrokerBody();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (request.getBody() != <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> registerBrokerBody = RegisterBrokerBody.decode(request.getBody(), requestHeader.isCompressed());</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> RemotingCommandException(<span class="string">"Failed to decode RegisterBrokerBody"</span>, e);</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> registerBrokerBody.getTopicConfigSerializeWrapper().getDataVersion().setCounter(<span class="keyword">new</span> AtomicLong(<span class="number">0</span>));</span><br><span class="line"> registerBrokerBody.getTopicConfigSerializeWrapper().getDataVersion().setTimestamp(<span class="number">0</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> RegisterBrokerResult result = <span class="keyword">this</span>.namesrvController.getRouteInfoManager().registerBroker(</span><br><span class="line"> requestHeader.getClusterName(),</span><br><span class="line"> requestHeader.getBrokerAddr(),</span><br><span class="line"> requestHeader.getBrokerName(),</span><br><span class="line"> requestHeader.getBrokerId(),</span><br><span class="line"> requestHeader.getHaServerAddr(),</span><br><span class="line"> registerBrokerBody.getTopicConfigSerializeWrapper(),</span><br><span class="line"> registerBrokerBody.getFilterServerList(),</span><br><span class="line"> ctx.channel());</span><br><span class="line"></span><br><span class="line"> responseHeader.setHaServerAddr(result.getHaServerAddr());</span><br><span class="line"> responseHeader.setMasterAddr(result.getMasterAddr());</span><br><span class="line"></span><br><span class="line"> <span class="keyword">byte</span>[] jsonValue = <span class="keyword">this</span>.namesrvController.getKvConfigManager().getKVListByNamespace(NamesrvUtil.NAMESPACE_ORDER_TOPIC_CONFIG);</span><br><span class="line"> response.setBody(jsonValue);</span><br><span class="line"></span><br><span class="line"> response.setCode(ResponseCode.SUCCESS);</span><br><span class="line"> response.setRemark(<span class="keyword">null</span>);</span><br><span class="line"> <span class="keyword">return</span> response;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p>可以看到主要的逻辑还是在<code>org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#registerBroker</code>这个方法里</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> RegisterBrokerResult <span class="title">registerBroker</span><span class="params">(</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> String clusterName,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> String brokerAddr,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> String brokerName,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">long</span> brokerId,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> String haServerAddr,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> TopicConfigSerializeWrapper topicConfigWrapper,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> List<String> filterServerList,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> Channel channel)</span> </span>{</span><br><span class="line"> RegisterBrokerResult result = <span class="keyword">new</span> RegisterBrokerResult();</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">this</span>.lock.writeLock().lockInterruptibly();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 更新这个clusterAddrTable</span></span><br><span class="line"> Set<String> brokerNames = <span class="keyword">this</span>.clusterAddrTable.get(clusterName);</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == brokerNames) {</span><br><span class="line"> brokerNames = <span class="keyword">new</span> HashSet<String>();</span><br><span class="line"> <span class="keyword">this</span>.clusterAddrTable.put(clusterName, brokerNames);</span><br><span class="line"> }</span><br><span class="line"> brokerNames.add(brokerName);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">boolean</span> registerFirst = <span class="keyword">false</span>;</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 更新brokerAddrTable</span></span><br><span class="line"> BrokerData brokerData = <span class="keyword">this</span>.brokerAddrTable.get(brokerName);</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == brokerData) {</span><br><span class="line"> registerFirst = <span class="keyword">true</span>;</span><br><span class="line"> brokerData = <span class="keyword">new</span> BrokerData(clusterName, brokerName, <span class="keyword">new</span> HashMap<Long, String>());</span><br><span class="line"> <span class="keyword">this</span>.brokerAddrTable.put(brokerName, brokerData);</span><br><span class="line"> }</span><br><span class="line"> Map<Long, String> brokerAddrsMap = brokerData.getBrokerAddrs();</span><br><span class="line"> <span class="comment">//Switch slave to master: first remove <1, IP:PORT> in namesrv, then add <0, IP:PORT></span></span><br><span class="line"> <span class="comment">//The same IP:PORT must only have one record in brokerAddrTable</span></span><br><span class="line"> Iterator<Entry<Long, String>> it = brokerAddrsMap.entrySet().iterator();</span><br><span class="line"> <span class="keyword">while</span> (it.hasNext()) {</span><br><span class="line"> Entry<Long, String> item = it.next();</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> != brokerAddr && brokerAddr.equals(item.getValue()) && brokerId != item.getKey()) {</span><br><span class="line"> it.remove();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> String oldAddr = brokerData.getBrokerAddrs().put(brokerId, brokerAddr);</span><br><span class="line"> registerFirst = registerFirst || (<span class="keyword">null</span> == oldAddr);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 更新了org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#topicQueueTable中的数据</span></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> != topicConfigWrapper</span><br><span class="line"> && MixAll.MASTER_ID == brokerId) {</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.isBrokerTopicConfigChanged(brokerAddr, topicConfigWrapper.getDataVersion())</span><br><span class="line"> || registerFirst) {</span><br><span class="line"> ConcurrentMap<String, TopicConfig> tcTable =</span><br><span class="line"> topicConfigWrapper.getTopicConfigTable();</span><br><span class="line"> <span class="keyword">if</span> (tcTable != <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">for</span> (Map.Entry<String, TopicConfig> entry : tcTable.entrySet()) {</span><br><span class="line"> <span class="keyword">this</span>.createAndUpdateQueueData(brokerName, entry.getValue());</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 更新活跃broker信息</span></span><br><span class="line"> BrokerLiveInfo prevBrokerLiveInfo = <span class="keyword">this</span>.brokerLiveTable.put(brokerAddr,</span><br><span class="line"> <span class="keyword">new</span> BrokerLiveInfo(</span><br><span class="line"> System.currentTimeMillis(),</span><br><span class="line"> topicConfigWrapper.getDataVersion(),</span><br><span class="line"> channel,</span><br><span class="line"> haServerAddr));</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == prevBrokerLiveInfo) {</span><br><span class="line"> log.info(<span class="string">"new broker registered, {} HAServer: {}"</span>, brokerAddr, haServerAddr);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 处理filter</span></span><br><span class="line"> <span class="keyword">if</span> (filterServerList != <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">if</span> (filterServerList.isEmpty()) {</span><br><span class="line"> <span class="keyword">this</span>.filterServerTable.remove(brokerAddr);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">this</span>.filterServerTable.put(brokerAddr, filterServerList);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 当当前broker非master时返回master信息</span></span><br><span class="line"> <span class="keyword">if</span> (MixAll.MASTER_ID != brokerId) {</span><br><span class="line"> String masterAddr = brokerData.getBrokerAddrs().get(MixAll.MASTER_ID);</span><br><span class="line"> <span class="keyword">if</span> (masterAddr != <span class="keyword">null</span>) {</span><br><span class="line"> BrokerLiveInfo brokerLiveInfo = <span class="keyword">this</span>.brokerLiveTable.get(masterAddr);</span><br><span class="line"> <span class="keyword">if</span> (brokerLiveInfo != <span class="keyword">null</span>) {</span><br><span class="line"> result.setHaServerAddr(brokerLiveInfo.getHaServerAddr());</span><br><span class="line"> result.setMasterAddr(masterAddr);</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"> <span class="keyword">this</span>.lock.writeLock().unlock();</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> log.error(<span class="string">"registerBroker Exception"</span>, e);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> result;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>这个是注册 broker 的逻辑，再看下根据 topic 获取 broker 信息和 topic 信息，<code>org.apache.rocketmq.namesrv.processor.DefaultRequestProcessor#getRouteInfoByTopic</code> 主要是这个方法的逻辑</p>
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<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><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> RemotingCommand <span class="title">getRouteInfoByTopic</span><span class="params">(ChannelHandlerContext ctx,</span></span></span><br><span class="line"><span class="function"><span class="params"> RemotingCommand request)</span> <span class="keyword">throws</span> RemotingCommandException </span>{</span><br><span class="line"> <span class="keyword">final</span> RemotingCommand response = RemotingCommand.createResponseCommand(<span class="keyword">null</span>);</span><br><span class="line"> <span class="keyword">final</span> GetRouteInfoRequestHeader requestHeader =</span><br><span class="line"> (GetRouteInfoRequestHeader) request.decodeCommandCustomHeader(GetRouteInfoRequestHeader<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"></span><br><span class="line"> TopicRouteData topicRouteData = <span class="keyword">this</span>.namesrvController.getRouteInfoManager().pickupTopicRouteData(requestHeader.getTopic());</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (topicRouteData != <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.namesrvController.getNamesrvConfig().isOrderMessageEnable()) {</span><br><span class="line"> String orderTopicConf =</span><br><span class="line"> <span class="keyword">this</span>.namesrvController.getKvConfigManager().getKVConfig(NamesrvUtil.NAMESPACE_ORDER_TOPIC_CONFIG,</span><br><span class="line"> requestHeader.getTopic());</span><br><span class="line"> topicRouteData.setOrderTopicConf(orderTopicConf);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">byte</span>[] content = topicRouteData.encode();</span><br><span class="line"> response.setBody(content);</span><br><span class="line"> response.setCode(ResponseCode.SUCCESS);</span><br><span class="line"> response.setRemark(<span class="keyword">null</span>);</span><br><span class="line"> <span class="keyword">return</span> response;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> response.setCode(ResponseCode.TOPIC_NOT_EXIST);</span><br><span class="line"> response.setRemark(<span class="string">"No topic route info in name server for the topic: "</span> + requestHeader.getTopic()</span><br><span class="line"> + FAQUrl.suggestTodo(FAQUrl.APPLY_TOPIC_URL));</span><br><span class="line"> <span class="keyword">return</span> response;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>首先调用<code>org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#pickupTopicRouteData</code>从<code>org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#topicQueueTable</code>获取到<code>org.apache.rocketmq.common.protocol.route.QueueData</code>这里面存了 brokerName，再通过<code>org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#brokerAddrTable</code>里获取到 broker 的地址信息等，然后再获取 orderMessage 的配置。</p>
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<p>简要分析了下 RocketMQ 的 NameServer 的代码，比较粗粒度。</p>
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<link itemprop="mainEntityOfPage" href="https://nicksxs.me/2020/06/26/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84-Consumer/">
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<a href="/2020/06/26/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84-Consumer/" class="post-title-link" itemprop="url">聊一下 RocketMQ 的 DefaultMQPushConsumer 源码</a>
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</h2>
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<time title="Created: 2020-06-26 22:21:20" itemprop="dateCreated datePublished" datetime="2020-06-26T22:21:20+08:00">2020-06-26</time>
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<span class="post-meta-item-text">Edited on</span>
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<time title="Modified: 2020-07-05 21:03:52" itemprop="dateModified" datetime="2020-07-05T21:03:52+08:00">2020-07-05</time>
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<a href="/categories/MQ/" itemprop="url" rel="index"><span itemprop="name">MQ</span></a>
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</span>
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,
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<a href="/categories/RocketMQ/" itemprop="url" rel="index"><span itemprop="name">RocketMQ</span></a>
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,
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<a href="/categories/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97/" itemprop="url" rel="index"><span itemprop="name">消息队列</span></a>
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,
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<p>首先看下官方的小 demo</p>
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<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><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> InterruptedException, MQClientException </span>{</span><br><span class="line"></span><br><span class="line"> <span class="comment">/*</span></span><br><span class="line"><span class="comment"> * Instantiate with specified consumer group name.</span></span><br><span class="line"><span class="comment"> * 首先是new 一个对象出来，然后指定 Consumer 的 Group</span></span><br><span class="line"><span class="comment"> * 同一类Consumer的集合，这类Consumer通常消费同一类消息且消费逻辑一致。消费者组使得在消息消费方面，实现负载均衡和容错的目标变得非常容易。要注意的是，消费者组的消费者实例必须订阅完全相同的Topic。RocketMQ 支持两种消息模式：集群消费（Clustering）和广播消费（Broadcasting）。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> DefaultMQPushConsumer consumer = <span class="keyword">new</span> DefaultMQPushConsumer(<span class="string">"please_rename_unique_group_name_4"</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/*</span></span><br><span class="line"><span class="comment"> * Specify name server addresses.</span></span><br><span class="line"><span class="comment"> * <p/></span></span><br><span class="line"><span class="comment"> * 这里可以通知指定环境变量或者设置对象参数的形式指定名字空间服务的地址</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * Alternatively, you may specify name server addresses via exporting environmental variable: NAMESRV_ADDR</span></span><br><span class="line"><span class="comment"> * <pre></span></span><br><span class="line"><span class="comment"> * {@code</span></span><br><span class="line"><span class="comment"> * consumer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876");</span></span><br><span class="line"><span class="comment"> * }</span></span><br><span class="line"><span class="comment"> * </pre></span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"> <span class="comment">/*</span></span><br><span class="line"><span class="comment"> * Specify where to start in case the specified consumer group is a brand new one.</span></span><br><span class="line"><span class="comment"> * 指定消费起始点</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/*</span></span><br><span class="line"><span class="comment"> * Subscribe one more more topics to consume.</span></span><br><span class="line"><span class="comment"> * 指定订阅的 topic 跟 tag，注意后面的是个表达式，可以以 tag1 || tag2 || tag3 传入</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> consumer.subscribe(<span class="string">"TopicTest"</span>, <span class="string">"*"</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/*</span></span><br><span class="line"><span class="comment"> * Register callback to execute on arrival of messages fetched from brokers.</span></span><br><span class="line"><span class="comment"> * 注册具体获得消息后的处理方法</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> consumer.registerMessageListener(<span class="keyword">new</span> MessageListenerConcurrently() {</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> ConsumeConcurrentlyStatus <span class="title">consumeMessage</span><span class="params">(List<MessageExt> msgs,</span></span></span><br><span class="line"><span class="function"><span class="params"> ConsumeConcurrentlyContext context)</span> </span>{</span><br><span class="line"> System.out.printf(<span class="string">"%s Receive New Messages: %s %n"</span>, Thread.currentThread().getName(), msgs);</span><br><span class="line"> <span class="keyword">return</span> ConsumeConcurrentlyStatus.CONSUME_SUCCESS;</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line"></span><br><span class="line"> <span class="comment">/*</span></span><br><span class="line"><span class="comment"> * Launch the consumer instance.</span></span><br><span class="line"><span class="comment"> * 启动消费者</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> consumer.start();</span><br><span class="line"></span><br><span class="line"> System.out.printf(<span class="string">"Consumer Started.%n"</span>);</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>然后就是看看 start 的过程了</p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * This method gets internal infrastructure readily to serve. Instances must call this method after configuration.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@throws</span> MQClientException if there is any client error.</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="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">start</span><span class="params">()</span> <span class="keyword">throws</span> MQClientException </span>{</span><br><span class="line"> setConsumerGroup(NamespaceUtil.wrapNamespace(<span class="keyword">this</span>.getNamespace(), <span class="keyword">this</span>.consumerGroup));</span><br><span class="line"> <span class="keyword">this</span>.defaultMQPushConsumerImpl.start();</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> != traceDispatcher) {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> traceDispatcher.start(<span class="keyword">this</span>.getNamesrvAddr(), <span class="keyword">this</span>.getAccessChannel());</span><br><span class="line"> } <span class="keyword">catch</span> (MQClientException e) {</span><br><span class="line"> log.warn(<span class="string">"trace dispatcher start failed "</span>, e);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>具体的逻辑在<code>this.defaultMQPushConsumerImpl.start()</code>，这个 defaultMQPushConsumerImpl 就是</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Internal implementation. Most of the functions herein are delegated to it.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">protected</span> <span class="keyword">final</span> <span class="keyword">transient</span> DefaultMQPushConsumerImpl defaultMQPushConsumerImpl;</span><br></pre></td></tr></table></figure>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">synchronized</span> <span class="keyword">void</span> <span class="title">start</span><span class="params">()</span> <span class="keyword">throws</span> MQClientException </span>{</span><br><span class="line"> <span class="keyword">switch</span> (<span class="keyword">this</span>.serviceState) {</span><br><span class="line"> <span class="keyword">case</span> CREATE_JUST:</span><br><span class="line"> log.info(<span class="string">"the consumer [{}] start beginning. messageModel={}, isUnitMode={}"</span>, <span class="keyword">this</span>.defaultMQPushConsumer.getConsumerGroup(),</span><br><span class="line"> <span class="keyword">this</span>.defaultMQPushConsumer.getMessageModel(), <span class="keyword">this</span>.defaultMQPushConsumer.isUnitMode());</span><br><span class="line"> <span class="comment">// 这里比较巧妙，相当于想设立了个屏障，防止并发启动，不过这里并不是悲观锁，也不算个严格的乐观锁</span></span><br><span class="line"> <span class="keyword">this</span>.serviceState = ServiceState.START_FAILED;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.checkConfig();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.copySubscription();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.defaultMQPushConsumer.getMessageModel() == MessageModel.CLUSTERING) {</span><br><span class="line"> <span class="keyword">this</span>.defaultMQPushConsumer.changeInstanceNameToPID();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 这个mQClientFactory，负责管理client（consumer、producer），并提供多中功能接口供各个Service（Rebalance、PullMessage等）调用；大部分逻辑均在这个类中完成</span></span><br><span class="line"> <span class="keyword">this</span>.mQClientFactory = MQClientManager.getInstance().getOrCreateMQClientInstance(<span class="keyword">this</span>.defaultMQPushConsumer, <span class="keyword">this</span>.rpcHook);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 这个 rebalanceImpl 主要负责决定，当前的consumer应该从哪些Queue中消费消息；</span></span><br><span class="line"> <span class="keyword">this</span>.rebalanceImpl.setConsumerGroup(<span class="keyword">this</span>.defaultMQPushConsumer.getConsumerGroup());</span><br><span class="line"> <span class="keyword">this</span>.rebalanceImpl.setMessageModel(<span class="keyword">this</span>.defaultMQPushConsumer.getMessageModel());</span><br><span class="line"> <span class="keyword">this</span>.rebalanceImpl.setAllocateMessageQueueStrategy(<span class="keyword">this</span>.defaultMQPushConsumer.getAllocateMessageQueueStrategy());</span><br><span class="line"> <span class="keyword">this</span>.rebalanceImpl.setmQClientFactory(<span class="keyword">this</span>.mQClientFactory);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 长连接，负责从broker处拉取消息，然后利用ConsumeMessageService回调用户的Listener执行消息消费逻辑</span></span><br><span class="line"> <span class="keyword">this</span>.pullAPIWrapper = <span class="keyword">new</span> PullAPIWrapper(</span><br><span class="line"> mQClientFactory,</span><br><span class="line"> <span class="keyword">this</span>.defaultMQPushConsumer.getConsumerGroup(), isUnitMode());</span><br><span class="line"> <span class="keyword">this</span>.pullAPIWrapper.registerFilterMessageHook(filterMessageHookList);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.defaultMQPushConsumer.getOffsetStore() != <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">this</span>.offsetStore = <span class="keyword">this</span>.defaultMQPushConsumer.getOffsetStore();</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">switch</span> (<span class="keyword">this</span>.defaultMQPushConsumer.getMessageModel()) {</span><br><span class="line"> <span class="keyword">case</span> BROADCASTING:</span><br><span class="line"> <span class="keyword">this</span>.offsetStore = <span class="keyword">new</span> LocalFileOffsetStore(<span class="keyword">this</span>.mQClientFactory, <span class="keyword">this</span>.defaultMQPushConsumer.getConsumerGroup());</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> CLUSTERING:</span><br><span class="line"> <span class="keyword">this</span>.offsetStore = <span class="keyword">new</span> RemoteBrokerOffsetStore(<span class="keyword">this</span>.mQClientFactory, <span class="keyword">this</span>.defaultMQPushConsumer.getConsumerGroup());</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">default</span>:</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">this</span>.defaultMQPushConsumer.setOffsetStore(<span class="keyword">this</span>.offsetStore);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// offsetStore 维护当前consumer的消费记录（offset）；有两种实现，Local和Rmote，Local存储在本地磁盘上，适用于BROADCASTING广播消费模式；而Remote则将消费进度存储在Broker上，适用于CLUSTERING集群消费模式；</span></span><br><span class="line"> <span class="keyword">this</span>.offsetStore.load();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.getMessageListenerInner() <span class="keyword">instanceof</span> MessageListenerOrderly) {</span><br><span class="line"> <span class="keyword">this</span>.consumeOrderly = <span class="keyword">true</span>;</span><br><span class="line"> <span class="keyword">this</span>.consumeMessageService =</span><br><span class="line"> <span class="keyword">new</span> ConsumeMessageOrderlyService(<span class="keyword">this</span>, (MessageListenerOrderly) <span class="keyword">this</span>.getMessageListenerInner());</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="keyword">this</span>.getMessageListenerInner() <span class="keyword">instanceof</span> MessageListenerConcurrently) {</span><br><span class="line"> <span class="keyword">this</span>.consumeOrderly = <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">this</span>.consumeMessageService =</span><br><span class="line"> <span class="keyword">new</span> ConsumeMessageConcurrentlyService(<span class="keyword">this</span>, (MessageListenerConcurrently) <span class="keyword">this</span>.getMessageListenerInner());</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 实现所谓的"Push-被动"消费机制；从Broker拉取的消息后，封装成ConsumeRequest提交给ConsumeMessageSerivce，此service负责回调用户的Listener消费消息；</span></span><br><span class="line"> <span class="keyword">this</span>.consumeMessageService.start();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">boolean</span> registerOK = mQClientFactory.registerConsumer(<span class="keyword">this</span>.defaultMQPushConsumer.getConsumerGroup(), <span class="keyword">this</span>);</span><br><span class="line"> <span class="keyword">if</span> (!registerOK) {</span><br><span class="line"> <span class="keyword">this</span>.serviceState = ServiceState.CREATE_JUST;</span><br><span class="line"> <span class="keyword">this</span>.consumeMessageService.shutdown();</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> MQClientException(<span class="string">"The consumer group["</span> + <span class="keyword">this</span>.defaultMQPushConsumer.getConsumerGroup()</span><br><span class="line"> + <span class="string">"] has been created before, specify another name please."</span> + FAQUrl.suggestTodo(FAQUrl.GROUP_NAME_DUPLICATE_URL),</span><br><span class="line"> <span class="keyword">null</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> mQClientFactory.start();</span><br><span class="line"> log.info(<span class="string">"the consumer [{}] start OK."</span>, <span class="keyword">this</span>.defaultMQPushConsumer.getConsumerGroup());</span><br><span class="line"> <span class="keyword">this</span>.serviceState = ServiceState.RUNNING;</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> RUNNING:</span><br><span class="line"> <span class="keyword">case</span> START_FAILED:</span><br><span class="line"> <span class="keyword">case</span> SHUTDOWN_ALREADY:</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> MQClientException(<span class="string">"The PushConsumer service state not OK, maybe started once, "</span></span><br><span class="line"> + <span class="keyword">this</span>.serviceState</span><br><span class="line"> + FAQUrl.suggestTodo(FAQUrl.CLIENT_SERVICE_NOT_OK),</span><br><span class="line"> <span class="keyword">null</span>);</span><br><span class="line"> <span class="keyword">default</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="keyword">this</span>.updateTopicSubscribeInfoWhenSubscriptionChanged();</span><br><span class="line"> <span class="keyword">this</span>.mQClientFactory.checkClientInBroker();</span><br><span class="line"> <span class="keyword">this</span>.mQClientFactory.sendHeartbeatToAllBrokerWithLock();</span><br><span class="line"> <span class="keyword">this</span>.mQClientFactory.rebalanceImmediately();</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>然后我们往下看主要的目光聚焦<code>mQClientFactory.start()</code></p>
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<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><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">start</span><span class="params">()</span> <span class="keyword">throws</span> MQClientException </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">synchronized</span> (<span class="keyword">this</span>) {</span><br><span class="line"> <span class="keyword">switch</span> (<span class="keyword">this</span>.serviceState) {</span><br><span class="line"> <span class="keyword">case</span> CREATE_JUST:</span><br><span class="line"> <span class="keyword">this</span>.serviceState = ServiceState.START_FAILED;</span><br><span class="line"> <span class="comment">// If not specified,looking address from name server</span></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == <span class="keyword">this</span>.clientConfig.getNamesrvAddr()) {</span><br><span class="line"> <span class="keyword">this</span>.mQClientAPIImpl.fetchNameServerAddr();</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// Start request-response channel</span></span><br><span class="line"> <span class="comment">// 这里主要是初始化了个网络客户端</span></span><br><span class="line"> <span class="keyword">this</span>.mQClientAPIImpl.start();</span><br><span class="line"> <span class="comment">// Start various schedule tasks</span></span><br><span class="line"> <span class="comment">// 定时任务</span></span><br><span class="line"> <span class="keyword">this</span>.startScheduledTask();</span><br><span class="line"> <span class="comment">// Start pull service</span></span><br><span class="line"> <span class="comment">// 这里重点说下</span></span><br><span class="line"> <span class="keyword">this</span>.pullMessageService.start();</span><br><span class="line"> <span class="comment">// Start rebalance service</span></span><br><span class="line"> <span class="keyword">this</span>.rebalanceService.start();</span><br><span class="line"> <span class="comment">// Start push service</span></span><br><span class="line"> <span class="keyword">this</span>.defaultMQProducer.getDefaultMQProducerImpl().start(<span class="keyword">false</span>);</span><br><span class="line"> log.info(<span class="string">"the client factory [{}] start OK"</span>, <span class="keyword">this</span>.clientId);</span><br><span class="line"> <span class="keyword">this</span>.serviceState = ServiceState.RUNNING;</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> START_FAILED:</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> MQClientException(<span class="string">"The Factory object["</span> + <span class="keyword">this</span>.getClientId() + <span class="string">"] has been created before, and failed."</span>, <span class="keyword">null</span>);</span><br><span class="line"> <span class="keyword">default</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><br></pre></td></tr></table></figure>
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<p>我们来看下这个 pullMessageService，org.apache.rocketmq.client.impl.consumer.PullMessageService，<br><img data-src="https://mystore-1255223546.cos.ap-chengdu.myqcloud.com/uPic/QdeiVv.png" alt=""><br>实现了 runnable 接口，<br>然后可以看到 run 方法</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</span><br><span class="line"> log.info(<span class="keyword">this</span>.getServiceName() + <span class="string">" service started"</span>);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">while</span> (!<span class="keyword">this</span>.isStopped()) {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> PullRequest pullRequest = <span class="keyword">this</span>.pullRequestQueue.take();</span><br><span class="line"> <span class="keyword">this</span>.pullMessage(pullRequest);</span><br><span class="line"> } <span class="keyword">catch</span> (InterruptedException ignored) {</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> log.error(<span class="string">"Pull Message Service Run Method exception"</span>, e);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> log.info(<span class="keyword">this</span>.getServiceName() + <span class="string">" service end"</span>);</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>接着在看 pullMessage 方法</p>
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<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><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">pullMessage</span><span class="params">(<span class="keyword">final</span> PullRequest pullRequest)</span> </span>{</span><br><span class="line"> <span class="keyword">final</span> MQConsumerInner consumer = <span class="keyword">this</span>.mQClientFactory.selectConsumer(pullRequest.getConsumerGroup());</span><br><span class="line"> <span class="keyword">if</span> (consumer != <span class="keyword">null</span>) {</span><br><span class="line"> DefaultMQPushConsumerImpl impl = (DefaultMQPushConsumerImpl) consumer;</span><br><span class="line"> impl.pullMessage(pullRequest);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> log.warn(<span class="string">"No matched consumer for the PullRequest {}, drop it"</span>, pullRequest);</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>实际上调用了这个方法，这个方法很长，我在代码里注释下下每一段的功能</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br><span class="line">151</span><br><span class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br><span class="line">159</span><br><span class="line">160</span><br><span class="line">161</span><br><span class="line">162</span><br><span class="line">163</span><br><span class="line">164</span><br><span class="line">165</span><br><span class="line">166</span><br><span class="line">167</span><br><span class="line">168</span><br><span class="line">169</span><br><span class="line">170</span><br><span class="line">171</span><br><span class="line">172</span><br><span class="line">173</span><br><span class="line">174</span><br><span class="line">175</span><br><span class="line">176</span><br><span class="line">177</span><br><span class="line">178</span><br><span class="line">179</span><br><span class="line">180</span><br><span class="line">181</span><br><span class="line">182</span><br><span class="line">183</span><br><span class="line">184</span><br><span class="line">185</span><br><span class="line">186</span><br><span class="line">187</span><br><span class="line">188</span><br><span class="line">189</span><br><span class="line">190</span><br><span class="line">191</span><br><span class="line">192</span><br><span class="line">193</span><br><span class="line">194</span><br><span class="line">195</span><br><span class="line">196</span><br><span class="line">197</span><br><span class="line">198</span><br><span class="line">199</span><br><span class="line">200</span><br><span class="line">201</span><br><span class="line">202</span><br><span class="line">203</span><br><span class="line">204</span><br><span class="line">205</span><br><span class="line">206</span><br><span class="line">207</span><br><span class="line">208</span><br><span class="line">209</span><br><span class="line">210</span><br><span class="line">211</span><br><span class="line">212</span><br><span class="line">213</span><br><span class="line">214</span><br><span class="line">215</span><br><span class="line">216</span><br><span class="line">217</span><br><span class="line">218</span><br><span class="line">219</span><br><span class="line">220</span><br><span class="line">221</span><br><span class="line">222</span><br><span class="line">223</span><br><span class="line">224</span><br><span class="line">225</span><br><span class="line">226</span><br><span class="line">227</span><br><span class="line">228</span><br><span class="line">229</span><br><span class="line">230</span><br><span class="line">231</span><br><span class="line">232</span><br><span class="line">233</span><br><span class="line">234</span><br><span class="line">235</span><br><span class="line">236</span><br><span class="line">237</span><br><span class="line">238</span><br><span class="line">239</span><br><span class="line">240</span><br><span class="line">241</span><br><span class="line">242</span><br><span class="line">243</span><br><span class="line">244</span><br><span class="line">245</span><br><span class="line">246</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">pullMessage</span><span class="params">(<span class="keyword">final</span> PullRequest pullRequest)</span> </span>{</span><br><span class="line"> <span class="keyword">final</span> ProcessQueue processQueue = pullRequest.getProcessQueue();</span><br><span class="line"> <span class="comment">// 这里开始就是检查状态，确定是否往下执行</span></span><br><span class="line"> <span class="keyword">if</span> (processQueue.isDropped()) {</span><br><span class="line"> log.info(<span class="string">"the pull request[{}] is dropped."</span>, pullRequest.toString());</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> pullRequest.getProcessQueue().setLastPullTimestamp(System.currentTimeMillis());</span><br><span class="line"></span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">this</span>.makeSureStateOK();</span><br><span class="line"> } <span class="keyword">catch</span> (MQClientException e) {</span><br><span class="line"> log.warn(<span class="string">"pullMessage exception, consumer state not ok"</span>, e);</span><br><span class="line"> <span class="keyword">this</span>.executePullRequestLater(pullRequest, pullTimeDelayMillsWhenException);</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.isPause()) {</span><br><span class="line"> log.warn(<span class="string">"consumer was paused, execute pull request later. instanceName={}, group={}"</span>, <span class="keyword">this</span>.defaultMQPushConsumer.getInstanceName(), <span class="keyword">this</span>.defaultMQPushConsumer.getConsumerGroup());</span><br><span class="line"> <span class="keyword">this</span>.executePullRequestLater(pullRequest, PULL_TIME_DELAY_MILLS_WHEN_SUSPEND);</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 这块其实是个类似于限流的功能块，对消息数量和消息大小做限制</span></span><br><span class="line"> <span class="keyword">long</span> cachedMessageCount = processQueue.getMsgCount().get();</span><br><span class="line"> <span class="keyword">long</span> cachedMessageSizeInMiB = processQueue.getMsgSize().get() / (<span class="number">1024</span> * <span class="number">1024</span>);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (cachedMessageCount > <span class="keyword">this</span>.defaultMQPushConsumer.getPullThresholdForQueue()) {</span><br><span class="line"> <span class="keyword">this</span>.executePullRequestLater(pullRequest, PULL_TIME_DELAY_MILLS_WHEN_FLOW_CONTROL);</span><br><span class="line"> <span class="keyword">if</span> ((queueFlowControlTimes++ % <span class="number">1000</span>) == <span class="number">0</span>) {</span><br><span class="line"> log.warn(</span><br><span class="line"> <span class="string">"the cached message count exceeds the threshold {}, so do flow control, minOffset={}, maxOffset={}, count={}, size={} MiB, pullRequest={}, flowControlTimes={}"</span>,</span><br><span class="line"> <span class="keyword">this</span>.defaultMQPushConsumer.getPullThresholdForQueue(), processQueue.getMsgTreeMap().firstKey(), processQueue.getMsgTreeMap().lastKey(), cachedMessageCount, cachedMessageSizeInMiB, pullRequest, queueFlowControlTimes);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (cachedMessageSizeInMiB > <span class="keyword">this</span>.defaultMQPushConsumer.getPullThresholdSizeForQueue()) {</span><br><span class="line"> <span class="keyword">this</span>.executePullRequestLater(pullRequest, PULL_TIME_DELAY_MILLS_WHEN_FLOW_CONTROL);</span><br><span class="line"> <span class="keyword">if</span> ((queueFlowControlTimes++ % <span class="number">1000</span>) == <span class="number">0</span>) {</span><br><span class="line"> log.warn(</span><br><span class="line"> <span class="string">"the cached message size exceeds the threshold {} MiB, so do flow control, minOffset={}, maxOffset={}, count={}, size={} MiB, pullRequest={}, flowControlTimes={}"</span>,</span><br><span class="line"> <span class="keyword">this</span>.defaultMQPushConsumer.getPullThresholdSizeForQueue(), processQueue.getMsgTreeMap().firstKey(), processQueue.getMsgTreeMap().lastKey(), cachedMessageCount, cachedMessageSizeInMiB, pullRequest, queueFlowControlTimes);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 若不是顺序消费（即DefaultMQPushConsumerImpl.consumeOrderly等于false），则检查ProcessQueue对象的msgTreeMap:TreeMap<Long,MessageExt>变量的第一个key值与最后一个key值之间的差额，该key值表示查询的队列偏移量queueoffset；若差额大于阈值（由DefaultMQPushConsumer. consumeConcurrentlyMaxSpan指定，默认是2000），则调用PullMessageService.executePullRequestLater方法，在50毫秒之后重新将该PullRequest请求放入PullMessageService.pullRequestQueue队列中；并跳出该方法；这里的意思主要就是消息有堆积了，等会再来拉取</span></span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.consumeOrderly) {</span><br><span class="line"> <span class="keyword">if</span> (processQueue.getMaxSpan() > <span class="keyword">this</span>.defaultMQPushConsumer.getConsumeConcurrentlyMaxSpan()) {</span><br><span class="line"> <span class="keyword">this</span>.executePullRequestLater(pullRequest, PULL_TIME_DELAY_MILLS_WHEN_FLOW_CONTROL);</span><br><span class="line"> <span class="keyword">if</span> ((queueMaxSpanFlowControlTimes++ % <span class="number">1000</span>) == <span class="number">0</span>) {</span><br><span class="line"> log.warn(</span><br><span class="line"> <span class="string">"the queue's messages, span too long, so do flow control, minOffset={}, maxOffset={}, maxSpan={}, pullRequest={}, flowControlTimes={}"</span>,</span><br><span class="line"> processQueue.getMsgTreeMap().firstKey(), processQueue.getMsgTreeMap().lastKey(), processQueue.getMaxSpan(),</span><br><span class="line"> pullRequest, queueMaxSpanFlowControlTimes);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">if</span> (processQueue.isLocked()) {</span><br><span class="line"> <span class="keyword">if</span> (!pullRequest.isLockedFirst()) {</span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">long</span> offset = <span class="keyword">this</span>.rebalanceImpl.computePullFromWhere(pullRequest.getMessageQueue());</span><br><span class="line"> <span class="keyword">boolean</span> brokerBusy = offset < pullRequest.getNextOffset();</span><br><span class="line"> log.info(<span class="string">"the first time to pull message, so fix offset from broker. pullRequest: {} NewOffset: {} brokerBusy: {}"</span>,</span><br><span class="line"> pullRequest, offset, brokerBusy);</span><br><span class="line"> <span class="keyword">if</span> (brokerBusy) {</span><br><span class="line"> log.info(<span class="string">"[NOTIFYME]the first time to pull message, but pull request offset larger than broker consume offset. pullRequest: {} NewOffset: {}"</span>,</span><br><span class="line"> pullRequest, offset);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> pullRequest.setLockedFirst(<span class="keyword">true</span>);</span><br><span class="line"> pullRequest.setNextOffset(offset);</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">this</span>.executePullRequestLater(pullRequest, pullTimeDelayMillsWhenException);</span><br><span class="line"> log.info(<span class="string">"pull message later because not locked in broker, {}"</span>, pullRequest);</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 以PullRequest.messageQueue对象的topic值为参数从RebalanceImpl.subscriptionInner: ConcurrentHashMap, SubscriptionData>中获取对应的SubscriptionData对象，若该对象为null，考虑到并发的关系，调用executePullRequestLater方法，稍后重试；并跳出该方法；</span></span><br><span class="line"> <span class="keyword">final</span> SubscriptionData subscriptionData = <span class="keyword">this</span>.rebalanceImpl.getSubscriptionInner().get(pullRequest.getMessageQueue().getTopic());</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == subscriptionData) {</span><br><span class="line"> <span class="keyword">this</span>.executePullRequestLater(pullRequest, pullTimeDelayMillsWhenException);</span><br><span class="line"> log.warn(<span class="string">"find the consumer's subscription failed, {}"</span>, pullRequest);</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">long</span> beginTimestamp = System.currentTimeMillis();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 异步拉取回调，先不讨论细节</span></span><br><span class="line"> PullCallback pullCallback = <span class="keyword">new</span> PullCallback() {</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onSuccess</span><span class="params">(PullResult pullResult)</span> </span>{</span><br><span class="line"> <span class="keyword">if</span> (pullResult != <span class="keyword">null</span>) {</span><br><span class="line"> pullResult = DefaultMQPushConsumerImpl.<span class="keyword">this</span>.pullAPIWrapper.processPullResult(pullRequest.getMessageQueue(), pullResult,</span><br><span class="line"> subscriptionData);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">switch</span> (pullResult.getPullStatus()) {</span><br><span class="line"> <span class="keyword">case</span> FOUND:</span><br><span class="line"> <span class="keyword">long</span> prevRequestOffset = pullRequest.getNextOffset();</span><br><span class="line"> pullRequest.setNextOffset(pullResult.getNextBeginOffset());</span><br><span class="line"> <span class="keyword">long</span> pullRT = System.currentTimeMillis() - beginTimestamp;</span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.getConsumerStatsManager().incPullRT(pullRequest.getConsumerGroup(),</span><br><span class="line"> pullRequest.getMessageQueue().getTopic(), pullRT);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">long</span> firstMsgOffset = Long.MAX_VALUE;</span><br><span class="line"> <span class="keyword">if</span> (pullResult.getMsgFoundList() == <span class="keyword">null</span> || pullResult.getMsgFoundList().isEmpty()) {</span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.executePullRequestImmediately(pullRequest);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> firstMsgOffset = pullResult.getMsgFoundList().get(<span class="number">0</span>).getQueueOffset();</span><br><span class="line"></span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.getConsumerStatsManager().incPullTPS(pullRequest.getConsumerGroup(),</span><br><span class="line"> pullRequest.getMessageQueue().getTopic(), pullResult.getMsgFoundList().size());</span><br><span class="line"></span><br><span class="line"> <span class="keyword">boolean</span> dispatchToConsume = processQueue.putMessage(pullResult.getMsgFoundList());</span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.consumeMessageService.submitConsumeRequest(</span><br><span class="line"> pullResult.getMsgFoundList(),</span><br><span class="line"> processQueue,</span><br><span class="line"> pullRequest.getMessageQueue(),</span><br><span class="line"> dispatchToConsume);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (DefaultMQPushConsumerImpl.<span class="keyword">this</span>.defaultMQPushConsumer.getPullInterval() > <span class="number">0</span>) {</span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.executePullRequestLater(pullRequest,</span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.defaultMQPushConsumer.getPullInterval());</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.executePullRequestImmediately(pullRequest);</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> (pullResult.getNextBeginOffset() < prevRequestOffset</span><br><span class="line"> || firstMsgOffset < prevRequestOffset) {</span><br><span class="line"> log.warn(</span><br><span class="line"> <span class="string">"[BUG] pull message result maybe data wrong, nextBeginOffset: {} firstMsgOffset: {} prevRequestOffset: {}"</span>,</span><br><span class="line"> pullResult.getNextBeginOffset(),</span><br><span class="line"> firstMsgOffset,</span><br><span class="line"> prevRequestOffset);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> NO_NEW_MSG:</span><br><span class="line"> pullRequest.setNextOffset(pullResult.getNextBeginOffset());</span><br><span class="line"></span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.correctTagsOffset(pullRequest);</span><br><span class="line"></span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.executePullRequestImmediately(pullRequest);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> NO_MATCHED_MSG:</span><br><span class="line"> pullRequest.setNextOffset(pullResult.getNextBeginOffset());</span><br><span class="line"></span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.correctTagsOffset(pullRequest);</span><br><span class="line"></span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.executePullRequestImmediately(pullRequest);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> OFFSET_ILLEGAL:</span><br><span class="line"> log.warn(<span class="string">"the pull request offset illegal, {} {}"</span>,</span><br><span class="line"> pullRequest.toString(), pullResult.toString());</span><br><span class="line"> pullRequest.setNextOffset(pullResult.getNextBeginOffset());</span><br><span class="line"></span><br><span class="line"> pullRequest.getProcessQueue().setDropped(<span class="keyword">true</span>);</span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.executeTaskLater(<span class="keyword">new</span> Runnable() {</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.offsetStore.updateOffset(pullRequest.getMessageQueue(),</span><br><span class="line"> pullRequest.getNextOffset(), <span class="keyword">false</span>);</span><br><span class="line"></span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.offsetStore.persist(pullRequest.getMessageQueue());</span><br><span class="line"></span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.rebalanceImpl.removeProcessQueue(pullRequest.getMessageQueue());</span><br><span class="line"></span><br><span class="line"> log.warn(<span class="string">"fix the pull request offset, {}"</span>, pullRequest);</span><br><span class="line"> } <span class="keyword">catch</span> (Throwable e) {</span><br><span class="line"> log.error(<span class="string">"executeTaskLater Exception"</span>, e);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }, <span class="number">10000</span>);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">default</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><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onException</span><span class="params">(Throwable e)</span> </span>{</span><br><span class="line"> <span class="keyword">if</span> (!pullRequest.getMessageQueue().getTopic().startsWith(MixAll.RETRY_GROUP_TOPIC_PREFIX)) {</span><br><span class="line"> log.warn(<span class="string">"execute the pull request exception"</span>, e);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> DefaultMQPushConsumerImpl.<span class="keyword">this</span>.executePullRequestLater(pullRequest, pullTimeDelayMillsWhenException);</span><br><span class="line"> }</span><br><span class="line"> };</span><br><span class="line"> <span class="comment">// 如果为集群模式，即可置commitOffsetEnable为 true</span></span><br><span class="line"> <span class="keyword">boolean</span> commitOffsetEnable = <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">long</span> commitOffsetValue = <span class="number">0L</span>;</span><br><span class="line"> <span class="keyword">if</span> (MessageModel.CLUSTERING == <span class="keyword">this</span>.defaultMQPushConsumer.getMessageModel()) {</span><br><span class="line"> commitOffsetValue = <span class="keyword">this</span>.offsetStore.readOffset(pullRequest.getMessageQueue(), ReadOffsetType.READ_FROM_MEMORY);</span><br><span class="line"> <span class="keyword">if</span> (commitOffsetValue > <span class="number">0</span>) {</span><br><span class="line"> commitOffsetEnable = <span class="keyword">true</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 将上面获得的commitOffsetEnable更新到订阅关系里</span></span><br><span class="line"> String subExpression = <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">boolean</span> classFilter = <span class="keyword">false</span>;</span><br><span class="line"> SubscriptionData sd = <span class="keyword">this</span>.rebalanceImpl.getSubscriptionInner().get(pullRequest.getMessageQueue().getTopic());</span><br><span class="line"> <span class="keyword">if</span> (sd != <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.defaultMQPushConsumer.isPostSubscriptionWhenPull() && !sd.isClassFilterMode()) {</span><br><span class="line"> subExpression = sd.getSubString();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> classFilter = sd.isClassFilterMode();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 组成 sysFlag</span></span><br><span class="line"> <span class="keyword">int</span> sysFlag = PullSysFlag.buildSysFlag(</span><br><span class="line"> commitOffsetEnable, <span class="comment">// commitOffset</span></span><br><span class="line"> <span class="keyword">true</span>, <span class="comment">// suspend</span></span><br><span class="line"> subExpression != <span class="keyword">null</span>, <span class="comment">// subscription</span></span><br><span class="line"> classFilter <span class="comment">// class filter</span></span><br><span class="line"> );</span><br><span class="line"> <span class="comment">// 调用真正的拉取消息接口</span></span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">this</span>.pullAPIWrapper.pullKernelImpl(</span><br><span class="line"> pullRequest.getMessageQueue(),</span><br><span class="line"> subExpression,</span><br><span class="line"> subscriptionData.getExpressionType(),</span><br><span class="line"> subscriptionData.getSubVersion(),</span><br><span class="line"> pullRequest.getNextOffset(),</span><br><span class="line"> <span class="keyword">this</span>.defaultMQPushConsumer.getPullBatchSize(),</span><br><span class="line"> sysFlag,</span><br><span class="line"> commitOffsetValue,</span><br><span class="line"> BROKER_SUSPEND_MAX_TIME_MILLIS,</span><br><span class="line"> CONSUMER_TIMEOUT_MILLIS_WHEN_SUSPEND,</span><br><span class="line"> CommunicationMode.ASYNC,</span><br><span class="line"> pullCallback</span><br><span class="line"> );</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> log.error(<span class="string">"pullKernelImpl exception"</span>, e);</span><br><span class="line"> <span class="keyword">this</span>.executePullRequestLater(pullRequest, pullTimeDelayMillsWhenException);</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>以下就是拉取消息的底层 api，不够不是特别复杂，主要是在找 broker，和设置请求参数</p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> PullResult <span class="title">pullKernelImpl</span><span class="params">(</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> MessageQueue mq,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> String subExpression,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> String expressionType,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">long</span> subVersion,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">long</span> offset,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">int</span> maxNums,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">int</span> sysFlag,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">long</span> commitOffset,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">long</span> brokerSuspendMaxTimeMillis,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">long</span> timeoutMillis,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> CommunicationMode communicationMode,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> PullCallback pullCallback</span></span></span><br><span class="line"><span class="function"><span class="params">)</span> <span class="keyword">throws</span> MQClientException, RemotingException, MQBrokerException, InterruptedException </span>{</span><br><span class="line"> FindBrokerResult findBrokerResult =</span><br><span class="line"> <span class="keyword">this</span>.mQClientFactory.findBrokerAddressInSubscribe(mq.getBrokerName(),</span><br><span class="line"> <span class="keyword">this</span>.recalculatePullFromWhichNode(mq), <span class="keyword">false</span>);</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == findBrokerResult) {</span><br><span class="line"> <span class="keyword">this</span>.mQClientFactory.updateTopicRouteInfoFromNameServer(mq.getTopic());</span><br><span class="line"> findBrokerResult =</span><br><span class="line"> <span class="keyword">this</span>.mQClientFactory.findBrokerAddressInSubscribe(mq.getBrokerName(),</span><br><span class="line"> <span class="keyword">this</span>.recalculatePullFromWhichNode(mq), <span class="keyword">false</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (findBrokerResult != <span class="keyword">null</span>) {</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">// check version</span></span><br><span class="line"> <span class="keyword">if</span> (!ExpressionType.isTagType(expressionType)</span><br><span class="line"> && findBrokerResult.getBrokerVersion() < MQVersion.Version.V4_1_0_SNAPSHOT.ordinal()) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> MQClientException(<span class="string">"The broker["</span> + mq.getBrokerName() + <span class="string">", "</span></span><br><span class="line"> + findBrokerResult.getBrokerVersion() + <span class="string">"] does not upgrade to support for filter message by "</span> + expressionType, <span class="keyword">null</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">int</span> sysFlagInner = sysFlag;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (findBrokerResult.isSlave()) {</span><br><span class="line"> sysFlagInner = PullSysFlag.clearCommitOffsetFlag(sysFlagInner);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> PullMessageRequestHeader requestHeader = <span class="keyword">new</span> PullMessageRequestHeader();</span><br><span class="line"> requestHeader.setConsumerGroup(<span class="keyword">this</span>.consumerGroup);</span><br><span class="line"> requestHeader.setTopic(mq.getTopic());</span><br><span class="line"> requestHeader.setQueueId(mq.getQueueId());</span><br><span class="line"> requestHeader.setQueueOffset(offset);</span><br><span class="line"> requestHeader.setMaxMsgNums(maxNums);</span><br><span class="line"> requestHeader.setSysFlag(sysFlagInner);</span><br><span class="line"> requestHeader.setCommitOffset(commitOffset);</span><br><span class="line"> requestHeader.setSuspendTimeoutMillis(brokerSuspendMaxTimeMillis);</span><br><span class="line"> requestHeader.setSubscription(subExpression);</span><br><span class="line"> requestHeader.setSubVersion(subVersion);</span><br><span class="line"> requestHeader.setExpressionType(expressionType);</span><br><span class="line"></span><br><span class="line"> String brokerAddr = findBrokerResult.getBrokerAddr();</span><br><span class="line"> <span class="keyword">if</span> (PullSysFlag.hasClassFilterFlag(sysFlagInner)) {</span><br><span class="line"> brokerAddr = computPullFromWhichFilterServer(mq.getTopic(), brokerAddr);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> PullResult pullResult = <span class="keyword">this</span>.mQClientFactory.getMQClientAPIImpl().pullMessage(</span><br><span class="line"> brokerAddr,</span><br><span class="line"> requestHeader,</span><br><span class="line"> timeoutMillis,</span><br><span class="line"> communicationMode,</span><br><span class="line"> pullCallback);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> pullResult;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> MQClientException(<span class="string">"The broker["</span> + mq.getBrokerName() + <span class="string">"] not exist"</span>, <span class="keyword">null</span>);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p>再看下一步的</p>
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<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><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> PullResult <span class="title">pullMessage</span><span class="params">(</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> String addr,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> PullMessageRequestHeader requestHeader,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">long</span> timeoutMillis,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> CommunicationMode communicationMode,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> PullCallback pullCallback</span></span></span><br><span class="line"><span class="function"><span class="params">)</span> <span class="keyword">throws</span> RemotingException, MQBrokerException, InterruptedException </span>{</span><br><span class="line"> RemotingCommand request = RemotingCommand.createRequestCommand(RequestCode.PULL_MESSAGE, requestHeader);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">switch</span> (communicationMode) {</span><br><span class="line"> <span class="keyword">case</span> ONEWAY:</span><br><span class="line"> <span class="keyword">assert</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">case</span> ASYNC:</span><br><span class="line"> <span class="keyword">this</span>.pullMessageAsync(addr, request, timeoutMillis, pullCallback);</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">case</span> SYNC:</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.pullMessageSync(addr, request, timeoutMillis);</span><br><span class="line"> <span class="keyword">default</span>:</span><br><span class="line"> <span class="keyword">assert</span> <span class="keyword">false</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="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p>通过 communicationMode 判断是同步拉取还是异步拉取，异步就调用</p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">pullMessageAsync</span><span class="params">(</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> String addr,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> RemotingCommand request,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">long</span> timeoutMillis,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> PullCallback pullCallback</span></span></span><br><span class="line"><span class="function"><span class="params"> )</span> <span class="keyword">throws</span> RemotingException, InterruptedException </span>{</span><br><span class="line"> <span class="keyword">this</span>.remotingClient.invokeAsync(addr, request, timeoutMillis, <span class="keyword">new</span> InvokeCallback() {</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">operationComplete</span><span class="params">(ResponseFuture responseFuture)</span> </span>{</span><br><span class="line"> 异步</span><br><span class="line"> RemotingCommand response = responseFuture.getResponseCommand();</span><br><span class="line"> <span class="keyword">if</span> (response != <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> PullResult pullResult = MQClientAPIImpl.<span class="keyword">this</span>.processPullResponse(response);</span><br><span class="line"> <span class="keyword">assert</span> pullResult != <span class="keyword">null</span>;</span><br><span class="line"> pullCallback.onSuccess(pullResult);</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> pullCallback.onException(e);</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">if</span> (!responseFuture.isSendRequestOK()) {</span><br><span class="line"> pullCallback.onException(<span class="keyword">new</span> MQClientException(<span class="string">"send request failed to "</span> + addr + <span class="string">". Request: "</span> + request, responseFuture.getCause()));</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (responseFuture.isTimeout()) {</span><br><span class="line"> pullCallback.onException(<span class="keyword">new</span> MQClientException(<span class="string">"wait response from "</span> + addr + <span class="string">" timeout :"</span> + responseFuture.getTimeoutMillis() + <span class="string">"ms"</span> + <span class="string">". Request: "</span> + request,</span><br><span class="line"> responseFuture.getCause()));</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> pullCallback.onException(<span class="keyword">new</span> MQClientException(<span class="string">"unknown reason. addr: "</span> + addr + <span class="string">", timeoutMillis: "</span> + timeoutMillis + <span class="string">". Request: "</span> + request, responseFuture.getCause()));</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>并且会调用前面 pullCallback 的onSuccess和onException方法，同步的就是调用</p>
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<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><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> PullResult <span class="title">pullMessageSync</span><span class="params">(</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> String addr,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> RemotingCommand request,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">long</span> timeoutMillis</span></span></span><br><span class="line"><span class="function"><span class="params"> )</span> <span class="keyword">throws</span> RemotingException, InterruptedException, MQBrokerException </span>{</span><br><span class="line"> RemotingCommand response = <span class="keyword">this</span>.remotingClient.invokeSync(addr, request, timeoutMillis);</span><br><span class="line"> <span class="keyword">assert</span> response != <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.processPullResponse(response);</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>然后就是这个 remotingClient 的 invokeAsync 跟 invokeSync 方法</p>
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<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><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">invokeAsync</span><span class="params">(String addr, RemotingCommand request, <span class="keyword">long</span> timeoutMillis, InvokeCallback invokeCallback)</span></span></span><br><span class="line"><span class="function"> <span class="keyword">throws</span> InterruptedException, RemotingConnectException, RemotingTooMuchRequestException, RemotingTimeoutException,</span></span><br><span class="line"><span class="function"> RemotingSendRequestException </span>{</span><br><span class="line"> <span class="keyword">long</span> beginStartTime = System.currentTimeMillis();</span><br><span class="line"> <span class="keyword">final</span> Channel channel = <span class="keyword">this</span>.getAndCreateChannel(addr);</span><br><span class="line"> <span class="keyword">if</span> (channel != <span class="keyword">null</span> && channel.isActive()) {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> doBeforeRpcHooks(addr, request);</span><br><span class="line"> <span class="keyword">long</span> costTime = System.currentTimeMillis() - beginStartTime;</span><br><span class="line"> <span class="keyword">if</span> (timeoutMillis < costTime) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> RemotingTooMuchRequestException(<span class="string">"invokeAsync call timeout"</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">this</span>.invokeAsyncImpl(channel, request, timeoutMillis - costTime, invokeCallback);</span><br><span class="line"> } <span class="keyword">catch</span> (RemotingSendRequestException e) {</span><br><span class="line"> log.warn(<span class="string">"invokeAsync: send request exception, so close the channel[{}]"</span>, addr);</span><br><span class="line"> <span class="keyword">this</span>.closeChannel(addr, channel);</span><br><span class="line"> <span class="keyword">throw</span> e;</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">this</span>.closeChannel(addr, channel);</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> RemotingConnectException(addr);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"><span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> RemotingCommand <span class="title">invokeSync</span><span class="params">(String addr, <span class="keyword">final</span> RemotingCommand request, <span class="keyword">long</span> timeoutMillis)</span></span></span><br><span class="line"><span class="function"> <span class="keyword">throws</span> InterruptedException, RemotingConnectException, RemotingSendRequestException, RemotingTimeoutException </span>{</span><br><span class="line"> <span class="keyword">long</span> beginStartTime = System.currentTimeMillis();</span><br><span class="line"> <span class="keyword">final</span> Channel channel = <span class="keyword">this</span>.getAndCreateChannel(addr);</span><br><span class="line"> <span class="keyword">if</span> (channel != <span class="keyword">null</span> && channel.isActive()) {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> doBeforeRpcHooks(addr, request);</span><br><span class="line"> <span class="keyword">long</span> costTime = System.currentTimeMillis() - beginStartTime;</span><br><span class="line"> <span class="keyword">if</span> (timeoutMillis < costTime) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> RemotingTimeoutException(<span class="string">"invokeSync call timeout"</span>);</span><br><span class="line"> }</span><br><span class="line"> RemotingCommand response = <span class="keyword">this</span>.invokeSyncImpl(channel, request, timeoutMillis - costTime);</span><br><span class="line"> doAfterRpcHooks(RemotingHelper.parseChannelRemoteAddr(channel), request, response);</span><br><span class="line"> <span class="keyword">return</span> response;</span><br><span class="line"> } <span class="keyword">catch</span> (RemotingSendRequestException e) {</span><br><span class="line"> log.warn(<span class="string">"invokeSync: send request exception, so close the channel[{}]"</span>, addr);</span><br><span class="line"> <span class="keyword">this</span>.closeChannel(addr, channel);</span><br><span class="line"> <span class="keyword">throw</span> e;</span><br><span class="line"> } <span class="keyword">catch</span> (RemotingTimeoutException e) {</span><br><span class="line"> <span class="keyword">if</span> (nettyClientConfig.isClientCloseSocketIfTimeout()) {</span><br><span class="line"> <span class="keyword">this</span>.closeChannel(addr, channel);</span><br><span class="line"> log.warn(<span class="string">"invokeSync: close socket because of timeout, {}ms, {}"</span>, timeoutMillis, addr);</span><br><span class="line"> }</span><br><span class="line"> log.warn(<span class="string">"invokeSync: wait response timeout exception, the channel[{}]"</span>, addr);</span><br><span class="line"> <span class="keyword">throw</span> e;</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">this</span>.closeChannel(addr, channel);</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> RemotingConnectException(addr);</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>再往下看</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> RemotingCommand <span class="title">invokeSyncImpl</span><span class="params">(<span class="keyword">final</span> Channel channel, <span class="keyword">final</span> RemotingCommand request,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> <span class="keyword">long</span> timeoutMillis)</span></span></span><br><span class="line"><span class="function"> <span class="keyword">throws</span> InterruptedException, RemotingSendRequestException, RemotingTimeoutException </span>{</span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">int</span> opaque = request.getOpaque();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> 同步跟异步都是会把结果用ResponseFuture抱起来</span><br><span class="line"> <span class="keyword">final</span> ResponseFuture responseFuture = <span class="keyword">new</span> ResponseFuture(channel, opaque, timeoutMillis, <span class="keyword">null</span>, <span class="keyword">null</span>);</span><br><span class="line"> <span class="keyword">this</span>.responseTable.put(opaque, responseFuture);</span><br><span class="line"> <span class="keyword">final</span> SocketAddress addr = channel.remoteAddress();</span><br><span class="line"> channel.writeAndFlush(request).addListener(<span class="keyword">new</span> ChannelFutureListener() {</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">operationComplete</span><span class="params">(ChannelFuture f)</span> <span class="keyword">throws</span> Exception </span>{</span><br><span class="line"> <span class="keyword">if</span> (f.isSuccess()) {</span><br><span class="line"> responseFuture.setSendRequestOK(<span class="keyword">true</span>);</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> responseFuture.setSendRequestOK(<span class="keyword">false</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> responseTable.remove(opaque);</span><br><span class="line"> responseFuture.setCause(f.cause());</span><br><span class="line"> responseFuture.putResponse(<span class="keyword">null</span>);</span><br><span class="line"> log.warn(<span class="string">"send a request command to channel <"</span> + addr + <span class="string">"> failed."</span>);</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line"> <span class="comment">// 区别是同步的是在这等待</span></span><br><span class="line"> RemotingCommand responseCommand = responseFuture.waitResponse(timeoutMillis);</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == responseCommand) {</span><br><span class="line"> <span class="keyword">if</span> (responseFuture.isSendRequestOK()) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> RemotingTimeoutException(RemotingHelper.parseSocketAddressAddr(addr), timeoutMillis,</span><br><span class="line"> responseFuture.getCause());</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> RemotingSendRequestException(RemotingHelper.parseSocketAddressAddr(addr), responseFuture.getCause());</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> responseCommand;</span><br><span class="line"> } <span class="keyword">finally</span> {</span><br><span class="line"> <span class="keyword">this</span>.responseTable.remove(opaque);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">invokeAsyncImpl</span><span class="params">(<span class="keyword">final</span> Channel channel, <span class="keyword">final</span> RemotingCommand request, <span class="keyword">final</span> <span class="keyword">long</span> timeoutMillis,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> InvokeCallback invokeCallback)</span></span></span><br><span class="line"><span class="function"> <span class="keyword">throws</span> InterruptedException, RemotingTooMuchRequestException, RemotingTimeoutException, RemotingSendRequestException </span>{</span><br><span class="line"> <span class="keyword">long</span> beginStartTime = System.currentTimeMillis();</span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">int</span> opaque = request.getOpaque();</span><br><span class="line"> <span class="keyword">boolean</span> acquired = <span class="keyword">this</span>.semaphoreAsync.tryAcquire(timeoutMillis, TimeUnit.MILLISECONDS);</span><br><span class="line"> <span class="keyword">if</span> (acquired) {</span><br><span class="line"> <span class="keyword">final</span> SemaphoreReleaseOnlyOnce once = <span class="keyword">new</span> SemaphoreReleaseOnlyOnce(<span class="keyword">this</span>.semaphoreAsync);</span><br><span class="line"> <span class="keyword">long</span> costTime = System.currentTimeMillis() - beginStartTime;</span><br><span class="line"> <span class="keyword">if</span> (timeoutMillis < costTime) {</span><br><span class="line"> once.release();</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> RemotingTimeoutException(<span class="string">"invokeAsyncImpl call timeout"</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">final</span> ResponseFuture responseFuture = <span class="keyword">new</span> ResponseFuture(channel, opaque, timeoutMillis - costTime, invokeCallback, once);</span><br><span class="line"> <span class="keyword">this</span>.responseTable.put(opaque, responseFuture);</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> channel.writeAndFlush(request).addListener(<span class="keyword">new</span> ChannelFutureListener() {</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">operationComplete</span><span class="params">(ChannelFuture f)</span> <span class="keyword">throws</span> Exception </span>{</span><br><span class="line"> <span class="keyword">if</span> (f.isSuccess()) {</span><br><span class="line"> responseFuture.setSendRequestOK(<span class="keyword">true</span>);</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"> requestFail(opaque);</span><br><span class="line"> log.warn(<span class="string">"send a request command to channel <{}> failed."</span>, RemotingHelper.parseChannelRemoteAddr(channel));</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> responseFuture.release();</span><br><span class="line"> log.warn(<span class="string">"send a request command to channel <"</span> + RemotingHelper.parseChannelRemoteAddr(channel) + <span class="string">"> Exception"</span>, e);</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> RemotingSendRequestException(RemotingHelper.parseChannelRemoteAddr(channel), e);</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">if</span> (timeoutMillis <= <span class="number">0</span>) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> RemotingTooMuchRequestException(<span class="string">"invokeAsyncImpl invoke too fast"</span>);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> String info =</span><br><span class="line"> String.format(<span class="string">"invokeAsyncImpl tryAcquire semaphore timeout, %dms, waiting thread nums: %d semaphoreAsyncValue: %d"</span>,</span><br><span class="line"> timeoutMillis,</span><br><span class="line"> <span class="keyword">this</span>.semaphoreAsync.getQueueLength(),</span><br><span class="line"> <span class="keyword">this</span>.semaphoreAsync.availablePermits()</span><br><span class="line"> );</span><br><span class="line"> log.warn(info);</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> RemotingTimeoutException(info);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>说起消息队列一般Web后端做过一段时间开发的肯定会用过，在前司的时候用的是改良版的 NSQ，有点像 NOSQL 的简写版🙄，其实是个go 语言写的消息队列，<a href="https://github.com/nsqio/nsq" target="_blank" rel="noopener">nsq</a> 看代码提交感觉最近更新的不是很勤，不过因为前司有专门的中间件团队，所以还是挺好用的，而且中间件团队的大牛也很厉害，一次都没碰到过丢消息之类的错误，然后现在公司用的是 RocketMQ，本着总还是要了解下的，并且消息队列也是服务端开发中一个很重要的中间件，因为不太有不需要用消息队列的后端团队了吧，原来对 nsq 也不是特别了解原理，就打算了解下 RocketMQ。</p>
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<p>还是像我这样的小白专属，消息队列用来干啥，很多都是标准答案，用来削峰填谷的，这个完全对，只是我想结合场景说给像我这样的小白同学听，想想一个电商的下单功能，除了 AT 两家之外应该大部分都是接入的支付，那么下单支付完成后一般都是等支付回调，告诉你支付完成了（也有可能是失败了，或者超时了咱们主动去查），然后这个回调里我们自己的业务代码干点啥，首先比如是把订单状态改掉了，然后会有各类的操作，比如把优惠券核销了，把其他金钱相关的也核销了，把购物车里对应的商品给删了，还有更次要的，比如发个客服消息，让用户确认下地址的，给用户加积分的等等等等，想象下如果这些都是回调里一股脑儿做掉了，那可能你的代码健壮性跟相关服务的稳定性还有性能要达到一个非常高的水平才能让业务不出现异常，并且万一流量打起来了，这些重要的不重要的操作都会阻塞着，所以需要用一个消息队列，在接到回调后只处理极少的几个核心操作，完了就把这个消息丢进消息队列里，让各个业务方去消费这个消息，把客服消息发一下，给用户加个积分等等，这样子主要的业务流程需要处理的事情就少了，速度也加快了，这个例子呢不能严格算是削峰填谷的例子，不过也算是消息队列的比较典型的使用场景了，要说真实的削峰填谷的话其实可以这么理解，假如短时间内有 1w 个请求进来，系统能支持的 QPS 才 1000，那么正常情况下服务就挂了，或者被限流了，为了让服务正常，那么可以把这些请求先放进消息队列里，我服务端以拉的模式按我的处理能力来消费，这样就没啥问题了</p>
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<p>扯了这么多来聊聊 RocketMQ 长啥样</p>
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<p><img data-src="https://mystore-1255223546.cos.ap-chengdu.myqcloud.com/uPic/6073827-a998e005dd13967c.png" alt="6073827-a998e005dd13967c"></p>
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<p>总共有四大部分：<strong>NameServer，Broker，Producer，Consumer。</strong></p>
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<h4 id="NameServer"><a href="#NameServer" class="headerlink" title="NameServer"></a>NameServer</h4><p>NameServer是一个非常简单的Topic路由注册中心，其角色类似Dubbo中的zookeeper，支持Broker的动态注册与发现。主要包括两个功能：Broker管理，NameServer接受Broker集群的注册信息并且保存下来作为路由信息的基本数据。然后提供心跳检测机制，检查Broker是否还存活；路由信息管理，每个NameServer将保存关于Broker集群的整个路由信息和用于客户端查询的队列信息。然后Producer和Conumser通过NameServer就可以知道整个Broker集群的路由信息，从而进行消息的投递和消费。NameServer通常也是集群的方式部署，各实例间相互不进行信息通讯。Broker是向每一台NameServer注册自己的路由信息，所以每一个NameServer实例上面都保存一份完整的路由信息。当某个NameServer因某种原因下线了，Broker仍然可以向其它NameServer同步其路由信息，Producer,Consumer仍然可以动态感知Broker的路由的信息。</p>
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<p>NameServer压力不会太大，正常情况主要负责维持心跳和提供Topic-Broker的关系数据。但有一点需要注意，Broker向Namesr发心跳时，会带上当前自己所负责的所有Topic信息，<strong>如果Topic个数太多，会导致一次心跳中，光Topic的数据就非常大，网络情况差的话，网络传输失败，心跳失败，导致Namesrv误认为Broker心跳失败。</strong></p>
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<h4 id="Broker"><a href="#Broker" class="headerlink" title="Broker"></a>Broker</h4><p>Broker主要负责消息的存储、投递和查询以及服务高可用保证，为了实现这些功能，Broker包含了以下几个重要子模块。</p>
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<ul>
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<li>Remoting Module：整个Broker的实体，负责处理来自clients端的请求。</li>
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<li>Client Manager：负责管理客户端(Producer/Consumer)和维护Consumer的Topic订阅信息</li>
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<li>Store Service：提供方便简单的API接口处理消息存储到物理硬盘和查询功能。</li>
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<li>HA Service：高可用服务，提供Master Broker 和 Slave Broker之间的数据同步功能。</li>
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<li>Index Service：根据特定的Message key对投递到Broker的消息进行索引服务，以提供消息的快速查询。</li>
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</ul>
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<h6 id="Broker的特点"><a href="#Broker的特点" class="headerlink" title="Broker的特点"></a>Broker的特点</h6><p><strong>1.负载均衡：</strong>Broker上存Topic信息，<strong>Topic由多个队列组成，队列会平均分散在多个Broker上，</strong>而Producer的发送机制保证消息尽量平均分布到所有队列中，<strong>最终效果就是所有消息都平均落在每个Broker上。</strong></p>
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<p><strong>2.动态伸缩能力（非顺序消息）</strong>：Broker的伸缩性体现在两个维度：Topic, Broker。</p>
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<blockquote>
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<p><strong>Topic维度：</strong>假如一个Topic的消息量特别大，但集群水位压力还是很低，就可以扩大该Topic的队列数，Topic的队列数跟发送、消费速度成正比。<br> <strong>Broker维度：</strong>如果集群水位很高了，需要扩容，直接加机器部署Broker就可以。Broker起来后想NameServer注册，Producer、Consumer通过NameServer发现新Broker，立即跟该Broker直连，收发消息。</p>
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</blockquote>
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<p><strong>3.高可用&高可靠</strong></p>
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<blockquote>
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<p><strong>高可用：</strong>集群部署时一般都为主备，备机实时从主机同步消息，如果其中一个主机宕机，备机提供消费服务，但不提供写服务。<br> <strong>高可靠：</strong>所有发往broker的消息，有同步刷盘和异步刷盘机制；同步刷盘时，消息写入物理文件才会返回成功，异步刷盘时，只有机器宕机，才会产生消息丢失，broker挂掉可能会发生，但是机器宕机崩溃是很少发生的，除非突然断电</p>
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</blockquote>
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<h4 id="Producer"><a href="#Producer" class="headerlink" title="Producer"></a>Producer</h4><p>Producer与NameServer集群中的其中一个节点（随机选择）建立长连接，定期从NameServer获取Topic路由信息，并向提供Topic 服务的Master建立长连接，且定时向Master发送心跳。Producer完全无状态，可集群部署。<br> <strong>RocketMQ提供三种发送方式：</strong></p>
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<blockquote>
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<p><strong>同步：</strong>在广泛的场景中使用可靠的同步传输，如重要的通知信息、短信通知、短信营销系统等。<br> <strong>异步：</strong>异步发送通常用于响应时间敏感的业务场景，发送出去即刻返回，利用回调做后续处理。<br> <strong>一次性：</strong>一次性发送用于需要中等可靠性的情况，如日志收集，发送出去即完成，不用等待发送结果，回调等等。</p>
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</blockquote>
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<h6 id="生产者端的负载均衡"><a href="#生产者端的负载均衡" class="headerlink" title="生产者端的负载均衡"></a>生产者端的负载均衡</h6><p>生产者发送时，会自动轮询当前所有可发送的broker，一条消息发送成功，下次换另外一个broker发送，以达到消息平均落到所有的broker上。</p>
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<h4 id="Consumer"><a href="#Consumer" class="headerlink" title="Consumer"></a>Consumer</h4><p>Consumer与NameServer集群中的其中一个节点（随机选择）建立长连接，定期从NameServer获取Topic路由信息，并向提供Topic服务的Master、Slave建立长连接，且定时向Master、Slave发送心跳。Consumer既可以从Master订阅消息，也可以从Slave订阅消息，消费者在向Master拉取消息时，Master服务器会根据拉取偏移量与最大偏移量的距离（判断是否读老消息，产生读I/O），以及从服务器是否可读等因素建议下一次是从Master还是Slave拉取。</p>
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<h6 id="消费者端的负载均衡"><a href="#消费者端的负载均衡" class="headerlink" title="消费者端的负载均衡"></a>消费者端的负载均衡</h6><p>先讨论消费者的消费模式，<strong>消费者有两种模式消费：集群消费，广播消费。</strong></p>
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<blockquote>
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<p><strong>广播消费：每个消费者消费Topic下的所有队列。</strong><br> <strong>集群消费：一个topic可以由同一个ID下所有消费者分担消费。</strong><br> 具体例子：假如TopicA有6个队列，某个消费者ID起了2个消费者实例，那么每个消费者负责消费3个队列。如果再增加一个消费者ID相同消费者实例，即当前共有3个消费者同时消费6个队列，那每个消费者负责2个队列的消费。</p>
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</blockquote>
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<p>消费者端的负载均衡，就是集群消费模式下，同一个ID的所有消费者实例平均消费该Topic的所有队列。</p>
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<p><strong>消费者从用户角度来看有两种类型：</strong></p>
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<blockquote>
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<p><strong>PullConsumer：主动从brokers处拉取消息。</strong>Consumer消费的一种类型，应用通常主动调用Consumer的拉消息方法从Broker服务器拉消息、主动权由应用控制。一旦获取了批量消息，应用就会启动消费过程。<br><strong>PushConsumer：Consumer消费的一种类型，该模式下Broker收到数据后会主动推送给消费端，该消费模式一般实时性较高。</strong></p>
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</blockquote>
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<h4 id="补充一些概念"><a href="#补充一些概念" class="headerlink" title="补充一些概念"></a>补充一些概念</h4><p><strong>Topic：主题，表示一类消息的集合，每个主题包含若干条消息，每条消息只能属于一个主题，是RocketMQ进行消息订阅的基本单位。</strong>Topic与生产者和消费者都是非常松散的关系，一个topic可以有0个或者1个或者多个生产者向其发送消息，换句话说，一个生产者可以同时向不同和topic发送消息。从消费者的解度来说，一个topic可能被0个或者一个或者多个消费组订阅，类似的，一个消费组可以订阅一个或者多个主题只要这个消费组的实例保持他们的订阅一致。</p>
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<p><strong>Message：消息</strong>消息系统所传输信息的物理载体，生产和消费数据的最小单位，每条消息必须属于一个主题。RocketMQ中每个消息拥有唯一的Message ID，且可以携带具有业务标识的Key。系统提供了通过Message ID和Key查询消息的功能。。</p>
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<p><strong>Message Queue：消息队列，</strong>一个主题被化分为一个或者多个子主题（sub-topics），“消息队列”.</p>
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<p><strong>Tag：标签，为消息设置的标志，用于同一主题下区分不同类型的消息。来自同一业务单元的消息，可以根据不同业务目的在同一主题下设置不同标签。标签能够有效地保持代码的清晰度和连贯性，并优化RocketMQ提供的查询系统。消费者可以根据Tag实现对不同子主题的不同消费逻辑，实现更好的扩展性。</strong>使用tag，同一业务模块不同目的的messages就可以用相同topic不同tag来标识。Tags有益于保持你的代码干净而条理清晰，同时促进使用RocketMQ提供的查询系统的效率。Topic：主题，是生产者发送的消息和消费者拉取的消息的归类。Topic与生产者和消费者都是非常松散的关系，一个topic可以有0个或者1个或者多个生产者向其发送消息，换句话说，一个生产者可以同时向不同和topic发送消息。从消费者的解度来说，一个topic可能被0个或者一个或者多个消费组订阅，类似的，一个消费组可以订阅一个或者多个主题只要这个消费组的实例保持他们的订阅一致。</p>
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<p><strong>Message Order：当使用DefaultMQPushConsumer时，你需要确定消费消息的方式：</strong></p>
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<blockquote>
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<p>Orderly：顺序地消费消息即表示消费的消息顺序同生产者发送的顺序一致。<br> Concurrently：并行消费。指定此方式消费，信息消费的最大并行数量仅受限于每个消费者客户端指定的线程池。</p>
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</blockquote>
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<p><strong>Consumer Group：消费组，</strong>同一类Consumer的集合，这类Consumer通常消费同一类消息且消费逻辑一致。消费者组使得在消息消费方面，实现负载均衡和容错的目标变得非常容易。要注意的是，消费者组的消费者实例必须订阅完全相同的Topic。RocketMQ 支持两种消息模式：集群消费（Clustering）和广播消费（Broadcasting）。<br><strong>Producer Group:生产者组，</strong>同一类Producer的集合，这类Producer发送同一类消息且发送逻辑一致。如果发送的是事务消息且原始生产者在发送之后崩溃，则Broker服务器会联系同一生产者组的其他生产者实例以提交或回溯消费。</p>
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<p>上面的这些我主要参考了 RocketMQ 的 GitHub 介绍和一些优秀网文的介绍，侵权请联系我删除。</p>
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<p>熟悉我的人（谁熟悉你啊🙄）知道我以前写过 PHP，虽然现在在工作中没用到了，但是自己的一些小工具还是会用 PHP 来写，但是在 Mac 碰到了一个环境相关的问题，因为我也是个更新狂魔，用了 brew 之后因为 gfw 的原因，如果长时间不更新，有时候要装一个用它装一个软件的话，前置的更新耗时就会让人非常头大，所以我基本会隔天 update 一下，但是这样会带来一个很心烦的问题，就是像这样，因为我是要用一个固定版本的 PHP，如果一直升需要一直配扩展啥的也很麻烦，如果一直升级 PHP 到最新版可能会比较少碰到这个问题</p>
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<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.64.dylib</span><br></pre></td></tr></table></figure>
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<p>这是什么鬼啊，然后我去这个目录下看了下，已经都是libicui18n.67.dylib了，而且它没有把原来的版本保留下来，首先这个是个叫 icu4c是啥玩意，谷歌了一下</p>
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<blockquote>
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<p>ICU4C是ICU在C/C++平台下的版本, ICU(International Component for Unicode)是基于”IBM公共许可证”的，与开源组织合作研究的, 用于支持软件国际化的开源项目。ICU4C提供了C/C++平台强大的国际化开发能力，软件开发者几乎可以使用ICU4C解决任何国际化的问题，根据各地的风俗和语言习惯，实现对数字、货币、时间、日期、和消息的格式化、解析，对字符串进行大小写转换、整理、搜索和排序等功能，必须一提的是，ICU4C提供了强大的BIDI算法，对阿拉伯语等BIDI语言提供了完善的支持。</p>
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</blockquote>
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<p>然后首先想到的解决方案就是能不能我使用<code>brew install icu4c@64</code>来重装下原来的版本，发现不行，并木有，之前的做法就只能是去网上把 64 的下载下来，然后放到这个目录，比较麻烦不智能，虽然没抱着希望在谷歌着，不过这次竟然给我找到了一个我认为非常 nice 的解决方案，因为是在 Stack Overflow 找到的，本着写给像我这样的小小白看的，那就稍微翻译一下<br>第一步，我们到 brew的目录下</p>
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<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">cd $(brew --prefix)/Homebrew/Library/Taps/homebrew/homebrew-core/Formula</span><br></pre></td></tr></table></figure>
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<p>这个可以理解为是 maven 的 pom 文件，不过有很多不同之处，使用ruby 写的，然后一个文件对应一个组件或者软件，那我们看下有个叫icu4c.rb的文件，<br>第二步看看它的提交历史</p>
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<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git log --follow icu4c.rb</span><br></pre></td></tr></table></figure>
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<p>在 git log 的海洋中寻找，寻找它的(64版本)的身影<br><img data-src="https://mystore-1255223546.cos.ap-chengdu.myqcloud.com/uPic/YzS7vN.png" alt=""><br>第三步注意这三个红框，Stack Overflow 给出来的答案这一步是找到这个 commit id 直接切出一个新分支</p>
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<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git checkout -b icu4c-63 e7f0f10dc63b1dc1061d475f1a61d01b70ef2cb7</span><br></pre></td></tr></table></figure>
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<p>其实注意 commit id 旁边的红框，这个是有tag 的，可以直接</p>
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<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git checkout icu4c-64</span><br></pre></td></tr></table></figure>
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<p>PS: 因为我的问题是出在 64 的问题，Stack Overflow 回答的是 63 的，反正是一样的解决方法<br>第四部，切回去之后我们就可以用 brew 提供的基于文件的安装命令来重新装上 64 版本</p>
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<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">brew reinstall ./icu4c.rb</span><br></pre></td></tr></table></figure>
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<p>然后就是第五步，切换版本</p>
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<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">brew switch icu4c 64.2</span><br></pre></td></tr></table></figure>
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<p>最后把分支切回来</p>
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<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git checkout master</span><br></pre></td></tr></table></figure>
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<p>是不是感觉很厉害的解决方法，大佬还提供了一个更牛的，直接写个 zsh 方法</p>
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<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#</span><span class="bash"> zsh</span></span><br><span class="line">function hiicu64() {</span><br><span class="line"> local last_dir=$(pwd)</span><br><span class="line"></span><br><span class="line"> cd $(brew --prefix)/Homebrew/Library/Taps/homebrew/homebrew-core/Formula</span><br><span class="line"> git checkout icu4c-4</span><br><span class="line"> brew reinstall ./icu4c.rb</span><br><span class="line"> brew switch icu4c 64.2</span><br><span class="line"> git checkout master</span><br><span class="line"></span><br><span class="line"> cd $last_dir</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p>对应自己的版本改改版本号就可以了，非常好用。</p>
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