[feature/event-dispatcher] Allow subscribers to be loaded from extensions

PHPBB3-9550

phpBB/includes/event/extension_subscriber_loader.php

@@ -0,0 +1,43 @@
+<?php
+/**
+*
+* @package phpBB3
+* @copyright (c) 2011 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+class phpbb_event_extension_subscriber_loader
+{
+	private $dispatcher;
+	private $extension_manager;
+
+	public function __construct(phpbb_event_dispatcher $dispatcher, phpbb_extension_manager $extension_manager)
+	{
+		$this->dispatcher = $dispatcher;
+		$this->extension_manager = $extension_manager;
+	}
+
+	public function load()
+	{
+		$finder = $this->extension_manager->get_finder();
+		$subscriber_classes = $finder
+			->extension_directory('/event')
+			->suffix('subscriber')
+			->core_path('event/')
+			->get_classes();
+
+		foreach ($subscriber_classes as $class) {
+			$subscriber = new $class();
+			$this->dispatcher->add_subscriber($subscriber);
+		}
+	}
+}