EventManager.php

<?php
/**
 * wCMF - wemove Content Management Framework
 * Copyright (C) 2005-2020 wemove digital solutions GmbH
 *
 * Licensed under the terms of the MIT License.
 *
 * See the LICENSE file distributed with this work for
 * additional information.
 */
namespace wcmf\lib\core;
 
use wcmf\lib\core\Event;
 
/**
 * EventManager is responsible for dispatching events
 * to registered listeners.
 *
 * @author ingo herwig <ingo@wemove.com>
 */
interface EventManager {
 
  /**
   * Register a listener for a given event
   * @param $eventName The event name
   * @param $callback A php callback
   */
  public function addListener($eventName, $callback);
 
  /**
   * Remove a listener for a given event
   * @param $eventName The event name
   * @param $callback A php callback
   */
  public function removeListener($eventName, $callback);
 
  /**
   * Notify listeners about the given event.
   * @param $eventName The event name
   * @param $event An Event instance
   */
  public function dispatch($eventName, Event $event);
}
?>