如何在事件侦听器中利用 kernel.terminate

问题描述

在我的包中，我想利用 kernel.terminate 事件来刷新一些关于 webservice api 调用的统计信息.然而，我没有找到任何资源来以最好的方式做到这一点.

In my bundle, I want to take advantage of the kernel.terminate event to flush some statistics about webservice api call. Yet, I didn't find any resources to do it in the best way.

在监听器 GuzzleExceptionListener(他的作用是拦截每个失败的 webservice 调用)，我在其中注入了 EntityManger 服务.:

On a listener GuzzleExceptionListener (his role is to intercept every fail webservice call) in which i've injected the EntityManger service. :

if ($exception instanceof BadResponseException) {
    $entityManager = $this->entityManager;

    $dispatcher = new EventDispatcher;
    $dispatcher->addListener('kernel.terminate', function (Event $event) use ($entityManager) {
        $repository = $entityManager->getRepository("somerepository");
        // do some treatment for stats
        $entityManager->persist($apicall);
        $entityManager->flush();
    });
}

GuzzleExceptionListener 的声明:

<service id="my_service" class="%my_class%">
    <tag name="kernel.event_listener" event="kernel.exception" method="onKernelException" />
    <argument type="service" id="doctrine.orm.entity_manager" />
</service>

无论如何，当事件 kernel.terminate 被触发时，这个闭包不会被调用.为什么 ?是因为它本身就在侦听器中吗?

Anyhow, this closure is not called when the event kernel.terminate is fired. Why ? Is it because it's inside a listener itself ?

推荐答案

你应该注入 symfony 配置的事件调度器服务 (@event_dispatcher) 而不是在监听器中创建一个新的.

You should inject symfony's configured event dispatcher service (@event_dispatcher) instead of creating a new one inside the listener.

如果你只创建它并添加一个事件监听器 symfony 仍然没有引用这个新创建的 EventDispatcher 对象，因此不会使用它.

If you only create it and add an event-listener symfony still has no reference to this newly created EventDispatcher object and therefore won't use it.

<service id="my_service" class="%my_class%">
    <tag name="kernel.event_listener" event="kernel.exception" method="onKernelException" />
    <argument type="service" id="doctrine.orm.entity_manager" />
    <argument type="service" id="event_dispatcher" />
 </service>

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