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<div class="note success"><p>当事件监听了实现了ShouldQueue时，该事件就会通过队列进行处理。</p></div>
<p>根据已有事件监听者，在执行Dipatcher是，在队列(redis)里为其添加该监听者的序列化数据。在任务一条条执行(出队列)，将数据解析，执行对应监听者类的方法(默认handler方法)。</p>
<h5 id="ShouldQueue"><a href="#ShouldQueue" class="headerlink" title="ShouldQueue"></a>ShouldQueue</h5><figure class="highlight actionscript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//实现ShouldQueue接口</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">TestListener1</span> <span class="keyword">implements</span> <span class="title">ShouldQueue</span></span>{</span><br><span class="line"> <span class="comment">//</span></span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">test</span><span class="params">()</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> </span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<a id="more"></a>
<figure class="highlight php"><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="comment">//Dipatcher执行makeListener</span></span><br><span class="line"> <span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">createClassCallable</span><span class="params">($listener, $container)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> ...</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">$this</span>->handlerShouldBeQueued($class)) {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>->createQueuedHandlerCallable($class, $method);</span><br><span class="line"> } </span><br><span class="line"> ...</span><br><span class="line">}</span><br><span class="line"><span class="comment">//创建队列的操作回调</span></span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">createQueuedHandlerCallable</span><span class="params">($class, $method)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="function"><span class="keyword">function</span> <span class="params">()</span> <span class="title">use</span> <span class="params">($class, $method)</span> </span>{</span><br><span class="line"> $arguments = <span class="keyword">$this</span>->cloneArgumentsForQueueing(func_get_args());</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (method_exists($class, <span class="string">'queue'</span>)) {</span><br><span class="line"> <span class="comment">//自定义的队列操作方法</span></span><br><span class="line"> <span class="keyword">$this</span>->callQueueMethodOnHandler($class, $method, $arguments);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">$this</span>->resolveQueue()->push(<span class="string">'Illuminate\Events\CallQueuedHandler@call'</span>, [</span><br><span class="line"> <span class="string">'class'</span> => $class, <span class="string">'method'</span> => $method, <span class="string">'data'</span> => serialize($arguments),</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>
<h5 id="resolveQueue"><a href="#resolveQueue" class="headerlink" title="resolveQueue"></a>resolveQueue</h5><p>resolveQueue通过执行 $app->make(‘Illuminate\Contracts\Queue\Factory’),实质获取QueueManager类。也就是执行了容器最初绑定event时，通过setQueueResolver为event赋予的闭包。<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">$this</span>->app->singleton(<span class="string">'events'</span>, <span class="function"><span class="keyword">function</span> <span class="params">($app)</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> (<span class="keyword">new</span> Dispatcher($app))->setQueueResolver(</span><br><span class="line"> <span class="comment">//执行下面的闭包</span></span><br><span class="line"> <span class="function"><span class="keyword">function</span> <span class="params">()</span> <span class="title">use</span> <span class="params">($app)</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> $app->make(<span class="string">'Illuminate\Contracts\Queue\Factory'</span>);</span><br><span class="line"> });</span><br><span class="line">});</span><br></pre></td></tr></table></figure><br>说白了就是讲当前监听者类序列化， 将类名、执行方法、序列化后的数据存入队列，这里以redis为例。如执行event(new \App\Event\TestEvent())时,会在redis产生如下的数据:<br><figure class="highlight stata"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//redis_key</span></span><br><span class="line">在默认<span class="keyword">DB</span>下 queues下 的 'queues:default'中</span><br><span class="line"><span class="comment">//数据</span></span><br><span class="line">{</span><br><span class="line"> <span class="string">"job"</span>: <span class="string">"Illuminate\\Events\\CallQueuedHandler@call"</span>,</span><br><span class="line"> <span class="string">"data"</span>: {</span><br><span class="line"> <span class="string">"class"</span>: <span class="string">"App\\Listeners\\TestListener1"</span>,</span><br><span class="line"> <span class="string">"method"</span>: <span class="string">"test"</span>,</span><br><span class="line"> <span class="string">"data"</span>: <span class="string">"a:1:{i:0;O:20:\"</span><span class="keyword">App</span>\\Events\\TestEvent\<span class="string">":0:{}}"</span></span><br><span class="line"> },</span><br><span class="line"> <span class="string">"id"</span>: <span class="string">"ihS5FJPgxxFOUdg7TxmWjErmmY2Q6PTk"</span>,</span><br><span class="line"> <span class="string">"attempts"</span>: 1</span><br><span class="line">}</span><br></pre></td></tr></table></figure><br>在实际开发过程有些事件的触发后不需要即时处理，那么就先放进队列，然后在出队列进行逐个处理，比如系统通知等。看到上面的json字符串，我们大概都能想到它的处理流程，最终其实也是执行了App\Listeners\TestListener1下的test方法。<br>关于出队列的处理，我们知道在命令行通过执行php artisan queue:work 就可以将这些队列任务处理完毕。</p>
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