/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is JSWeakRef.
 *
 * The Initial Developer of the Original Code is Mozilla.
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Atul Varma <atul@mozilla.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

var EXPORTED_SYMBOLS = ["MemoryTracking"];

var classIds = {};
var trackedItems = {};

var MemoryTracking = {
  track: function track(obj, name) {
    var weakref;
    try {
      weakref = Components.classes["@labs.mozilla.com/jsweakrefdi;1"]
                .createInstance(Components.interfaces.nsIJSWeakRef);
    } catch (e) {
      // Weakrefs aren't available, do nothing.
      return;
    }
    weakref.set(obj);

    var className = obj.constructor.name;
    if (name)
      className += "_" + name;
    if (typeof(classIds[className]) == "undefined")
      classIds[className] = 0;
    var itemName = className + "_" + classIds[className];
    classIds[className]++;
    trackedItems[itemName] = weakref;
  },

  getLiveObjects: function getLiveObjects() {
    var liveObjects = [];

    for (name in trackedItems) {
      if (trackedItems[name].get())
        liveObjects.push(name);
      else
        delete trackedItems[name];
    }
    return liveObjects;
  }
};