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<!DOCTYPE html>
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<h2 class="post-title" itemprop="name headline">queue之Artisan</h2>
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950
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4
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<div class="note success"><p>关于事件出队列的处理，即控制台的queue:work命令的原理解析。</p></div>
<h5 id="artisan命令写入"><a href="#artisan命令写入" class="headerlink" title="artisan命令写入"></a>artisan命令写入</h5><p>要执行queue:work命令，首先命令在artisan中必须是存在，那么它是在哪里写入的呢<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><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></pre></td><td class="code"><pre><span class="line"><span class="comment">// QueueServiceProvider extends ServiceProvider</span></span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">registerWorkCommand</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->app->singleton(<span class="string">'command.queue.work'</span>, <span class="function"><span class="keyword">function</span> <span class="params">($app)</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> WorkCommand($app[<span class="string">'queue.worker'</span>]);</span><br><span class="line"> });</span><br><span class="line"> <span class="comment">//这里就是写入的地方</span></span><br><span class="line"> <span class="keyword">$this</span>->commands(<span class="string">'command.queue.work'</span>);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">//父类ServiceProvider</span></span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">commands</span><span class="params">($commands)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> $commands = is_array($commands) ? $commands : func_get_args();</span><br><span class="line"></span><br><span class="line"> $events = <span class="keyword">$this</span>->app[<span class="string">'events'</span>];</span><br><span class="line"></span><br><span class="line"> $events->listen(<span class="string">'artisan.start'</span>, <span class="function"><span class="keyword">function</span> <span class="params">($artisan)</span> <span class="title">use</span> <span class="params">($commands)</span> </span>{</span><br><span class="line"> $artisan->resolveCommands($commands);</span><br><span class="line"> });</span><br><span class="line">}</span><br></pre></td></tr></table></figure><br>除了最底层的基本命令(如 help)，其他命令一般都是在为服务提供者进行注册时进行的命令写入。可以看到在写入命令的同时，也为artisan.start注册了一个事件监听者。这个用途就是在当我们执行命令时，根据字符，解析成具体操作类。<br><a id="more"></a></p>
<h5 id="命令解析"><a href="#命令解析" class="headerlink" title="命令解析"></a>命令解析</h5><p>现在对 php artisan queue:work [ php 文件名 参数]。进行解析<br>命令行解析流程如下：</p>
<ul>
<li>获取artisan实例, Illuminate\Console\Application</li>
<li>artisan->resolveCommand(‘queue:work’),获取具体Command类</li>
<li>执行Command类->execute()方法<br>在这个例子中具体的Command实例就是WorkCommand类,然后执行其在这个例子中具体的Command实例就是WorkCommand类->execute()<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></pre></td><td class="code"><pre><span class="line"><span class="comment">//Illuminate\Console\Application时，进行事件触发处理</span></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">(Container $laravel, Dispatcher $events, $version)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> ...</span><br><span class="line"> $events->fire(<span class="string">'artisan.start'</span>, [<span class="keyword">$this</span>]);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">//实际是父类(Illuminate\Console\Command)上的方法</span></span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">execute</span><span class="params">(InputInterface $input, OutputInterface $output)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> $method = method_exists(<span class="keyword">$this</span>, <span class="string">'handle'</span>) ? <span class="string">'handle'</span> : <span class="string">'fire'</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>->laravel->call([<span class="keyword">$this</span>, $method]);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
WorkCommand是没有handle方法的，所以执行fire方法。在执行process可以看到，会现在当前任务的执行尝试次数，如果不满足条件，则按失败处理，并执行相关处理方法<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><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">fire</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"> $response = <span class="keyword">$this</span>->runWorker(</span><br><span class="line"> $connection, $queue, $delay, $memory, <span class="keyword">$this</span>->option(<span class="string">'daemon'</span>)</span><br><span class="line"> );</span><br><span class="line"> ....</span><br><span class="line">}</span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">runWorker</span><span class="params">($connection, $queue, $delay, $memory, $daemon = false)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> ....</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>->worker->pop(</span><br><span class="line"> $connection, $queue, $delay,</span><br><span class="line"> <span class="keyword">$this</span>->option(<span class="string">'sleep'</span>), <span class="keyword">$this</span>->option(<span class="string">'tries'</span>)</span><br><span class="line"> );</span><br><span class="line">}</span><br><span class="line"><span class="comment">//Illuminate\Queue\Worker</span></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">process</span><span class="params">($connection, Job $job, $maxTries = <span class="number">0</span>, $delay = <span class="number">0</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">if</span> ($maxTries > <span class="number">0</span> && $job->attempts() > $maxTries) {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>->logFailedJob($connection, $job);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//通过RedisQueue类获取RedisJob类</span></span><br><span class="line"> $job = <span class="keyword">$this</span>->getNextJob($connection, $queue);</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"></span><br><span class="line"> $job->fire();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">$this</span>->raiseAfterJobEvent($connection, $job);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> [<span class="string">'job'</span> => $job, <span class="string">'failed'</span> => <span class="keyword">false</span>];</span><br><span class="line"> } <span class="keyword">catch</span> (<span class="keyword">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>
按当前例子，这里的Job可以理解为一条redis数据(待处理任务),任务类也是RedisJob类。<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">//一般样本数据</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:\"App\\Events\\TestEvent\":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>: <span class="number">1</span></span><br><span class="line">},</span><br><span class="line"><span class="comment">//广播样本数据</span></span><br><span class="line">{</span><br><span class="line"> <span class="string">"job"</span>: <span class="string">"Illuminate\\Broadcasting\\BroadcastEvent"</span>,</span><br><span class="line"> <span class="string">"data"</span>: {</span><br><span class="line"> <span class="string">"event"</span>: <span class="string">"O:20:\"App\\Events\\TestEvent\":0:{}"</span></span><br><span class="line"> },</span><br><span class="line"> <span class="string">"id"</span>: <span class="string">"SGGHgGBWHzJrH8pPZKrXAmaxujdTZJbj"</span>,</span><br><span class="line"> <span class="string">"attempts"</span>: <span class="number">1</span></span><br><span class="line">}</span><br><span class="line"><span class="comment">//将队列数据转为数组</span></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">fire</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->resolveAndFire(json_decode(<span class="keyword">$this</span>->getRawBody(), <span class="keyword">true</span>));</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
resolveAndFire方法,将获取根据job字段值，获取具体操作实例。一般事件默认为Illuminate\Events\CallQueuedHandler@call。<font color="red">parseJob方法，如果没有@method, 则默认method为’fire’</font>，如广播事件则为Illuminate\Broadcasting\BroadcastEvent。 (相当于拼接.‘@fire’)。<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></pre></td><td class="code"><pre><span class="line"><span class="comment">//基类Illuminate\Queue\Jobs\Job</span></span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">resolveAndFire</span><span class="params">(array $payload)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">list</span>($class, $method) = <span class="keyword">$this</span>->parseJob($payload[<span class="string">'job'</span>]);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">$this</span>->instance = <span class="keyword">$this</span>->resolve($class);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">$this</span>->instance->{$method}(<span class="keyword">$this</span>, <span class="keyword">$this</span>->resolveQueueableEntities($payload[<span class="string">'data'</span>]));</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
获取Illuminate\Events\CallQueuedHandler实例，执行该实例的call方法。并将data作为参数传入。<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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">call</span><span class="params">(Job $job, array $data)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> $handler = <span class="keyword">$this</span>->setJobInstanceIfNecessary(</span><br><span class="line"> $job, <span class="keyword">$this</span>->container->make($data[<span class="string">'class'</span>])</span><br><span class="line"> );</span><br><span class="line"></span><br><span class="line"> call_user_func_array(</span><br><span class="line"> [$handler, $data[<span class="string">'method'</span>]], unserialize($data[<span class="string">'data'</span>])</span><br><span class="line"> );</span><br><span class="line"> <span class="comment">//清除队列数据</span></span><br><span class="line"> <span class="keyword">if</span> (! $job->isDeletedOrReleased()) {</span><br><span class="line"> $job->delete(); </span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
这里需要注意的一点是，清除队列中的该条任务，这里清除的实际是reversed有序队列中的备份任务，因为在生产环境中，由于程序错误导致任务无法正常进行是存在的，所以laravel会默认备份。</li>
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<div style="text-align:center;color: #ccc;font-size:14px;">-------------本文结束感谢您的阅读-------------</div>
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var query = new AV.Query(Counter);
var entries = [];
var $visitors = $(".leancloud_visitors");
$visitors.each(function () {
entries.push( $(this).attr("id").trim() );
});
query.containedIn('url', entries);
query.find()
.done(function (results) {
var COUNT_CONTAINER_REF = '.leancloud-visitors-count';
if (results.length === 0) {
$visitors.find(COUNT_CONTAINER_REF).text(0);
return;
}
for (var i = 0; i < results.length; i++) {
var item = results[i];
var url = item.get('url');
var time = item.get('time');
var element = document.getElementById(url);
$(element).find(COUNT_CONTAINER_REF).text(time);
}
for(var i = 0; i < entries.length; i++) {
var url = entries[i];
var element = document.getElementById(url);
var countSpan = $(element).find(COUNT_CONTAINER_REF);
if( countSpan.text() == '') {
countSpan.text(0);
}
}
})
.fail(function (object, error) {
console.log("Error: " + error.code + " " + error.message);
});
}
function addCount(Counter) {
var $visitors = $(".leancloud_visitors");
var url = $visitors.attr('id').trim();
var title = $visitors.attr('data-flag-title').trim();
var query = new AV.Query(Counter);
query.equalTo("url", url);
query.find({
success: function(results) {
if (results.length > 0) {
var counter = results[0];
counter.fetchWhenSave(true);
counter.increment("time");
counter.save(null, {
success: function(counter) {
var $element = $(document.getElementById(url));
$element.find('.leancloud-visitors-count').text(counter.get('time'));
},
error: function(counter, error) {
console.log('Failed to save Visitor num, with error message: ' + error.message);
}
});
} else {
var newcounter = new Counter();
/* Set ACL */
var acl = new AV.ACL();
acl.setPublicReadAccess(true);
acl.setPublicWriteAccess(true);
newcounter.setACL(acl);
/* End Set ACL */
newcounter.set("title", title);
newcounter.set("url", url);
newcounter.set("time", 1);
newcounter.save(null, {
success: function(newcounter) {
var $element = $(document.getElementById(url));
$element.find('.leancloud-visitors-count').text(newcounter.get('time'));
},
error: function(newcounter, error) {
console.log('Failed to create');
}
});
}
},
error: function(error) {
console.log('Error:' + error.code + " " + error.message);
}
});
}
$(function() {
var Counter = AV.Object.extend("Counter");
if ($('.leancloud_visitors').length == 1) {
addCount(Counter);
} else if ($('.post-title-link').length > 1) {
showTime(Counter);
}
});
</script>
<script>
(function(){
var bp = document.createElement('script');
var curProtocol = window.location.protocol.split(':')[0];
if (curProtocol === 'https') {
bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
}
else {
bp.src = 'http://push.zhanzhang.baidu.com/push.js';
}
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(bp, s);
})();
</script>
</body>
</html>