[AppBundle] encourage the use of EventSubscriber everywhere.

Author: Hugo Hamon

app/config/services.yml

@@ -111,12 +111,5 @@ services:
     AppBundle\EventListener\RedirectToPreferredLocaleSubscriber:
         $locales: '%app_locales%'
 
-    # Event Listeners are classes that listen to one or more specific events.
-    # Those events are defined in the tags added to the service definition.
-    # See http://symfony.com/doc/current/event_dispatcher.html#creating-an-event-listener
-    AppBundle\EventListener\CommentNotificationListener:
+    AppBundle\EventListener\CommentNotificationSubscriber:
         $sender: '%app.notifications.email_sender%'
-        # The "method" attribute of this tag is optional and defaults to "on + camelCasedEventName"
-        # If the event is "comment.created" the method executed by default is "onCommentCreated()".
-        tags:
-            - { name: kernel.event_listener, event: comment.created, method: onCommentCreated }

src/AppBundle/EventListener/CommentNotificationListener.php renamed to src/AppBundle/EventListener/CommentNotificationSubscriber.php

@@ -12,6 +12,7 @@
 namespace AppBundle\EventListener;
 
 use AppBundle\Entity\Comment;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\EventDispatcher\GenericEvent;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 use Symfony\Component\Translation\TranslatorInterface;
@@ -21,7 +22,7 @@
  *
  * @author Oleg Voronkovich <oleg-voronkovich@yandex.ru>
  */
-class CommentNotificationListener
+class CommentNotificationSubscriber implements EventSubscriberInterface
 {
     /**
      * @var \Swift_Mailer
@@ -95,4 +96,11 @@ public function onCommentCreated(GenericEvent $event)
         // See http://symfony.com/doc/current/email/dev_environment.html#viewing-from-the-web-debug-toolbar
         $this->mailer->send($message);
     }
+
+    public static function getSubscribedEvents()
+    {
+        return [
+            'comment.created' => 'onCommentCreated',
+        ];
+    }
 }