收听Symfony 2中的所有事件 [英] Listen for All Events in Symfony 2

问题描述

是否可以设置事件监听器(或执行其他操作?)来监听 all ，由Symfony 2 AppKernel 应用程序针对特定请求触发的事件?

Is it possible to setup an event listener (or do — something else?) to listen for all the events fired by a Symfony 2 AppKernel application for a particular request?

也就是说，我知道我可以使用 app_dev.php 浏览应用程序，并使用探查器查看所有 listeners 的列表，但我对此感兴趣获取已调度/触发的每个事件的列表.我知道某些事件系统具有特殊的全局/所有侦听器，这使我可以接收每个事件.我想知道Symfony是否具有类似的功能，或者是否存在另一种机制来获取特定页面上所有可用事件的列表.

That is, I know I can browse an application with app_dev.php and use the profiler to view a list of all the listeners, but I'm interested in grabbing a list of every event that's been dispatched/fired. I know some event systems have a special global/all listener what would let me receive every event. I'm wondering if Symfony has something similar, or if there's another mechanism to get a list of all the available events on a particular page.

我还知道我可以向事件调度程序类之一添加一些临时调试代码

I also know I could add some temporary debugging code to one of the event dispatcher classes

Symfony/Component/EventDispatcher/EventDispatcher.php
Symfony/Component/HttpKernel/Debug/ContainerAwareTraceableEventDispatcher.php
Symfony/Component/EventDispatcher/ContainerAwareEventDispatcher.php

但是我正在寻找的东西要少一点hack/破坏性较小.

but I'm looking for something that is less of a hack/less-destructive.

Symfony的新手，但编程新手.抱歉，如果这是一个幼稚的问题，但在Google上搜索并没有透露我所追求的.

New to Symfony, but not new to programming. Apologies if this is a naive question, but googling about hasn't revealed what I'm after.

推荐答案

干净的方法是创建自己的EventDispatcher，该EventDispatcher将执行日志记录或发生事件时要执行的任何操作.看看默认值了解其工作原理.

The clean way would be creating your own EventDispatcher which executes your logging or whatever you're trying to do if an event occurs. Have a look at the default one to get an idea of how it works.

现在首先创建课程

use Symfony\Component\EventDispatcher\EventDispatcher;

class MyDispatcher extends EventDispatcher
{

    // sadly those properties aren't protected in EventDispatcher
    private $listeners = array();
    private $sorted = array();


    public function dispatch($eventName, Event $event = null)
    {
        if (null === $event) {
            $event = new Event();
        }

        $event->setDispatcher($this);
        $event->setName($eventName);

        // do something with the event here ... i.e. log it

        if (!isset($this->listeners[$eventName])) {
            return $event;
        }

        $this->doDispatch($this->getListeners($eventName), $eventName, $event);

        return $event;
    }

...然后将MyDispatcher注册为symfony的默认目录.

... then register your MyDispatcher as symfony's default one.

(通过覆盖原始的event_dispatcher服务)

( by overwriting the original event_dispatcher service )

app/config/config.yml

services:
    event_dispatcher:
        class: Vendor\YourBundle\MyDispatcher
        arguments: [@service_container]

...甚至更简单，只需覆盖

... or even simpler just override the class parameter being used by symfony when creating the service.

parameters:
    event_dispatcher.class: Vendor\YourBundle\MyDispatcher

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