Issue 3868 - Use the new FilterNotifier API

lib/events.js

-/*
- * This file is part of Adblock Plus <https://adblockplus.org/>,
- * Copyright (C) 2006-2016 Eyeo GmbH
- *
- * Adblock Plus is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 3 as
- * published by the Free Software Foundation.
- *
- * Adblock Plus is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-/** @module events */
-
-"use strict";
-
-/**
- * Registers and emits names events.
- *
- * @constructor
- */
-exports.EventEmitter = function()
-{
-  this._listeners = Object.create(null);
-};
-
-exports.EventEmitter.prototype = {
-  /**
-   * Adds a listener for the specified event name.
-   *
-   * @param {string}   name
-   * @param {function} listener
-   */
-  on: function(name, listener)
-  {
-    if (name in this._listeners)
-      this._listeners[name].push(listener);
-    else
-      this._listeners[name] = [listener];
-  },
-
-  /**
-   * Removes a listener for the specified event name.
-   *
-   * @param {string}   name
-   * @param {function} listener
-   */
-  off: function(name, listener)
-  {
-    let listeners = this._listeners[name];
-    if (listeners)
-    {
-      let idx = listeners.indexOf(listener);
-      if (idx != -1)
-        listeners.splice(idx, 1);
-    }
-  },
-
-  /**
-   * Calls all previously added listeners for the given event name.
-   *
-   * @param {string} name
-   * @param {...*}   [arg]
-   */
-  emit: function(name)
-  {
-    let listeners = this._listeners[name];
-    if (listeners)
-    {
-      let args = [];
-      for (let i = 1; i < arguments.length; i++)
-        args.push(arguments[i]);
-
-      let currentListeners = listeners.slice();
-      for (let listener of currentListeners)
-        listener.apply(null, args);
-    }
-  }
-};