How to create custom event in symfony2

问题:

I want to create custom events called user_logged so that i can attach my listeners to those events.

I want to execute few functions whenever user has logged in.

回答1:

Create a class which extends Symfony\Component\EventDispatcher\Event.

Then, use the event dispatcher service to dispatch the event:

$eventDispatcher = $container->get('event_dispatcher');
$eventDispatcher->dispatch('custom.event.identifier', $event);

You can register your event listener service like so:

tags:
    - { name: kernel.event_listener, event: custom.event.identifier, method: onCustomEvent }

回答2:

This answer is little bit extend answer.

services.yml

custom.event.home_page_event:
    class: AppBundle\EventSubscriber\HomePageEventSubscriber
    tags:
        - { name: kernel.event_listener, event: custom.event.home_page_event, method: onCustomEvent }

AppBundle/EventSubscriber/HomePageEventSubscriber.php

namespace AppBundle\EventSubscriber;
class HomePageEventSubscriber
{
    public function onCustomEvent($event)
    {
        var_dump($event->getCode());
    }
}

AppBundle/Event/HomePageEvent.php

namespace AppBundle\Event;
use Symfony\Component\EventDispatcher\Event;
class HomePageEvent extends Event
{
    private $code;

    public function setCode($code)
    {
        $this->code = $code;
    }

    public function getCode()
    {
        return $this->code;
    }
}

anywhere you wish, for example in home page controller

    use AppBundle\Event\HomePageEvent;
    // ...
    $eventDispatcher = $this->get('event_dispatcher');
    $event = new HomePageEvent();
    $event->setCode(200);
    $eventDispatcher->dispatch('custom.event.home_page_event', $event);