<?php
  /**
   * Copyright (c) 2013 Robin Appelman <icewind@owncloud.com>
   * This file is licensed under the Affero General Public License version 3 or
   * later.
   * See the COPYING-README file.
   */
  
  namespace OC\Hooks;
  
  /**
   * Class Emitter
   *
   * interface for all classes that are able to emit events
   *
   * @package OC\Hooks
   */
  interface Emitter {
  	/**
  	 * @param string $scope
  	 * @param string $method
  	 * @param callable $callback
  	 */
  	public function listen($scope, $method, $callback);
  
  	/**
  	 * @param string $scope optional
  	 * @param string $method optional
  	 * @param callable $callback optional
  	 */
  	public function removeListener($scope = null, $method = null, $callback = null);
  }