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<div class="note success"><p>Event事件服务是框架中必要重要的一部分，其中也会用到Queue类，Broadcast类，这也是一种设计模式，叫观察者模式。</p></div>
<h5 id="Dispatcher"><a href="#Dispatcher" class="headerlink" title="Dispatcher"></a>Dispatcher</h5><p>通过EventProvider为容器注册一个’event’对应的Dispatcher类。通过容器make方法直接获取事件分配类。<font color="red">框架中有两个EventProvider,这两个作用是完全不一样的</font></p>
<ul>
<li><p>Illuminate\Events\EventServiceProvider，其注册是在Application的基本服务注册方法里</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="comment">// Application, 在App类实例化时就已经注册了。</span></span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">registerBaseServiceProviders</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->register(<span class="keyword">new</span> EventServiceProvider(<span class="keyword">$this</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">$this</span>->register(<span class="keyword">new</span> RoutingServiceProvider(<span class="keyword">$this</span>));</span><br><span class="line">}</span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">register</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->app->singleton(<span class="string">'events'</span>, <span class="function"><span class="keyword">function</span> <span class="params">($app)</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> (<span class="keyword">new</span> Dispatcher($app))->setQueueResolver(<span class="function"><span class="keyword">function</span> <span class="params">()</span> <span class="title">use</span> <span class="params">($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><span class="line">}</span><br></pre></td></tr></table></figure>
<a id="more"></a>
<p>可以看到，这里将event绑定为Dispatcher类，并同时为Dispatcher设置类一个获取Queue(队列)工厂类的闭包。我们框架中的event()实质就是用来处理具体事件的分配器Dispatcher类。</p>
</li>
<li><p>App\Providers\EventServiceProvider，在config/app配置的provider数组中注册。</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="comment">//继承</span></span><br><span class="line"><span class="keyword">use</span> <span class="title">Illuminate</span>\<span class="title">Foundation</span>\<span class="title">Support</span>\<span class="title">Providers</span>\<span class="title">EventServiceProvider</span> <span class="title">as</span> <span class="title">ServiceProvider</span>;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">EventServiceProvider</span> <span class="keyword">extends</span> <span class="title">ServiceProvider</span></span></span><br><span class="line"><span class="class"></span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">protected</span> $listen = [</span><br><span class="line"> <span class="string">'App\Events\TestEvent'</span> => [</span><br><span class="line"> <span class="string">'App\Listeners\TestListener1@test'</span>,</span><br><span class="line"> <span class="string">'App\Listeners\TestListener2'</span></span><br><span class="line"> ],</span><br><span class="line"> ];</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">boot</span><span class="params">(DispatcherContract $events)</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">parent</span>::boot($events);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//</span></span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>这个类是继承Support\Providers\EventServiceProvider类的，关注点在其boot方法中。在框架所有服务注册完毕，并准备启动是，就会执行所有服务的Boot方法。</p>
<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></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">boot</span><span class="params">(DispatcherContract $events)</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">foreach</span> (<span class="keyword">$this</span>->listen <span class="keyword">as</span> $event => $listeners) {</span><br><span class="line"> <span class="keyword">foreach</span> ($listeners <span class="keyword">as</span> $listener) {</span><br><span class="line"> $events->listen($event, $listener);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//订阅</span></span><br><span class="line"> <span class="keyword">foreach</span> (<span class="keyword">$this</span>->subscribe <span class="keyword">as</span> $subscriber) {</span><br><span class="line"> $events->subscribe($subscriber);</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
<p>如上，在$listen数组中注册一个事件，并使用两个监听者。在执行boot方法时，使用循环遍历的方法，逐个将事件及其监听者传入Dispatcher的listen方法。假设我们当前的例子是不进队列，也不广播的，只走最简单的流程。</p>
</li>
</ul>
<h5 id="Dispatcher-listen"><a href="#Dispatcher-listen" class="headerlink" title="Dispatcher listen"></a>Dispatcher listen</h5><p>将$listen数组中的事件存入Dispatcher中的listeners属性中<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></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">listen</span><span class="params">($events, $listener, $priority = <span class="number">0</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">foreach</span> ((<span class="keyword">array</span>) $events <span class="keyword">as</span> $event) {</span><br><span class="line"> <span class="comment">//如果含通配符</span></span><br><span class="line"> <span class="keyword">if</span> (Str::contains($event, <span class="string">'*'</span>)) {</span><br><span class="line"> <span class="keyword">$this</span>->setupWildcardListen($event, $listener);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">$this</span>->listeners[$event][$priority][] = <span class="keyword">$this</span>->makeListener($listener);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">unset</span>(<span class="keyword">$this</span>->sorted[$event]);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><br>含通配符的事件，存入wildcards数组中，这里主要说常用的。可以看到listeners中一个事件名对应的监听者是数组。按我们的例子就是<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><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="comment">//这里的0是事件优先级的排序，默认都为0</span></span><br><span class="line"><span class="keyword">$this</span>->listeners[<span class="string">'App\Events\TestEvent'</span>][<span class="number">0</span>] = [</span><br><span class="line"> <span class="keyword">$this</span>->makeListener(<span class="string">'App\Listeners\TestListener1@test'</span>),</span><br><span class="line"> <span class="keyword">$this</span>->makeListener(<span class="string">'App\Listeners\TestListener2'</span>)</span><br><span class="line">];</span><br><span class="line"><span class="comment">//</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">createClassListener</span><span class="params">($listener)</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> $container = <span class="keyword">$this</span>->container;</span><br><span class="line"></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">($listener, $container)</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> call_user_func_array(</span><br><span class="line"> <span class="keyword">$this</span>->createClassCallable($listener, $container), func_get_args()</span><br><span class="line"> );</span><br><span class="line"> };</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">createClassCallable</span><span class="params">($listener, $container)</span></span></span><br><span class="line"><span class="function"> </span>{ </span><br><span class="line"> <span class="comment">//首先进行字符串解析，App\Listeners\TestListener1@test对应</span></span><br><span class="line"> <span class="comment">//$class=App\Listeners\TestListener1 $method=test</span></span><br><span class="line"> <span class="keyword">list</span>($class, $method) = <span class="keyword">$this</span>->parseClassCallable($listener);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">$this</span>->handlerShouldBeQueued($class)) {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>->createQueuedHandlerCallable($class, $method);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="comment">//$method默认是handler</span></span><br><span class="line"> <span class="keyword">return</span> [$container->make($class), $method];</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br></pre></td></tr></table></figure><br>makeListener方法会返回一个用来执行 对应Listener类上对应方法的闭包。简单点就是下图，只要当App\Events\TestEvent触发，则会执行这两个函数。<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">$this</span>->listeners[<span class="string">'App\Events\TestEvent'</span>][<span class="number">0</span>] = [</span><br><span class="line"> <span class="function"><span class="keyword">function</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">new</span> App\Listeners\TestListener1 ->test();<span class="comment">//自定义的test方法</span></span><br><span class="line"> },</span><br><span class="line"> <span class="function"><span class="keyword">function</span><span class="params">()</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">new</span> App\Listeners\TestListener2 ->handle(); <span class="comment">//默认方法</span></span><br><span class="line"> }</span><br><span class="line">];</span><br></pre></td></tr></table></figure></p>
<h5 id="事件触发Fire"><a href="#事件触发Fire" class="headerlink" title="事件触发Fire"></a>事件触发Fire</h5><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><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</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">($event, $payload = [], $halt = false)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">if</span> (is_object($event)) {</span><br><span class="line"> <span class="keyword">list</span>($payload, $event) = [[$event], get_class($event)];</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> $responses = [];</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (! is_array($payload)) {</span><br><span class="line"> $payload = [$payload];</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">$this</span>->firing[] = $event;</span><br><span class="line"></span><br><span class="line"> <span class="comment">//判断当前事件是否需要广播</span></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">isset</span>($payload[<span class="number">0</span>]) && $payload[<span class="number">0</span>] <span class="keyword">instanceof</span> ShouldBroadcast) {</span><br><span class="line"> <span class="keyword">$this</span>->broadcastEvent($payload[<span class="number">0</span>]);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">foreach</span> (<span class="keyword">$this</span>->getListeners($event) <span class="keyword">as</span> $listener) {</span><br><span class="line"> $response = call_user_func_array($listener, $payload);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (! is_null($response) && $halt) {</span><br><span class="line"> array_pop(<span class="keyword">$this</span>->firing);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> $response;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> ($response === <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"> $responses[] = $response;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> array_pop(<span class="keyword">$this</span>->firing);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> $halt ? <span class="keyword">null</span> : $responses;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>现在来手动进行事件触发，执行event()->(‘App\Events\TestEvent’),如果是否字符串，就直接执行$this->getListeners(),然后循环执行事件处理方法(test,handle)。如果参数是实例,event()->(new \App\Events\TestEvent),则会判断该实例是否需要广播，如果是，则会另外加入广播队列。</p>
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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>