[ticket/12016] Use a service provider for event listeners

This allows them to use dependency injection

PHPBB3-12016

phpBB/config/services.yml

@@ -140,10 +140,17 @@ services:
         class: phpbb\event\extension_subscriber_loader
         arguments:
             - @dispatcher
-            - @ext.manager
+            - @event.listener_collection
         calls:
             - [load, []]
 
+    event.listener_collection:
+        class: phpbb\di\service_collection
+        arguments:
+            - @service_container
+        tags:
+            - { name: service_collection, tag: event.listener }
+
     ext.manager:
         class: phpbb\extension\manager
         arguments:

phpBB/phpbb/event/extension_subscriber_loader.php

@@ -14,26 +14,22 @@ use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 class extension_subscriber_loader
 {
 	private $dispatcher;
-	private $extension_manager;
+	private $listener_collection;
 
-	public function __construct(EventDispatcherInterface $dispatcher, \phpbb\extension\manager $extension_manager)
+	public function __construct(EventDispatcherInterface $dispatcher, \phpbb\di\service_collection $listener_collection)
 	{
 		$this->dispatcher = $dispatcher;
-		$this->extension_manager = $extension_manager;
+		$this->listener_collection = $listener_collection;
 	}
 
 	public function load()
 	{
-		$finder = $this->extension_manager->get_finder();
-		$subscriber_classes = $finder
-			->extension_directory('/event')
-			->core_path('event/')
-			->get_classes();
-
-		foreach ($subscriber_classes as $class)
+		if (!empty($this->listener_collection))
 		{
-			$subscriber = new $class();
-			$this->dispatcher->addSubscriber($subscriber);
+			foreach ($this->listener_collection as $listener)
+			{
+				$this->dispatcher->addSubscriber($listener);
+			}
 		}
 	}
 }