/* -*- Mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*- */
/* ***** 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 worker threads.
 *
 * The Initial Developer of the Original Code is
 *   Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Vladimir Vukicevic <vladimir@pobox.com> (Original Author)
 *   Ben Turner <bent.mozilla@gmail.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 ***** */

#include "nsISupports.idl"

interface nsIScriptError;

[scriptable, function, uuid(e50ca05d-1381-4abb-a021-02eb720cfc38)]
interface nsIDOMWorkerMessageListener : nsISupports
{
  /**
   * An nsIDOMWorkerThread receives the onMessage callback when another
   * worker posts a message to it.
   *
   * @param aMessage (in DOMString)
   *        The message sent from another worker.
   * @param aSource (in nsISupports)
   *        The worker that sent the message. Useful for a quick response.
   */
  void onMessage(in DOMString aMessage,
                 in nsISupports aSource);
};

[scriptable, function, uuid(9df8422e-25dd-43f4-b9b9-709f9e074647)]
interface nsIDOMWorkerErrorListener : nsISupports
{
  /**
   * An nsIDOMWorkerPool receives the onError callback when one of its child
   * workers has a parse error or an unhandled exception.
   * 
   * @param aMessage (in nsIScriptError)
   *        Details about the error that occurred. See nsIScriptError.
   * @param aSource (in nsISupports)
   *        The worker that sent the message. Depending on the specific error in
   *        question it may not be possible to use this object (in the case of a
   *        parse error, for instance, aSource will be unusable).
   */
  void onError(in nsIScriptError aError,
               in nsISupports aSource);
};

[scriptable, uuid(6f19f3ff-2aaa-4504-9b71-dca3c191efed)]
interface nsIDOMWorkerThread : nsISupports
{
  /**
   * Sends a message to the worker.
   *
   * @param aMessage (in DOMString)
   *        The message to send.
   */
  void postMessage(in DOMString aMessage);
};

[scriptable, uuid(45312e93-8a3e-4493-9bd9-272a6c23a16c)]
interface nsIDOMWorkerPool : nsISupports
{
  /**
   * Sends a message to the pool.
   *
   * @param aMessage (in DOMString)
   *        The message to send..
   */
  void postMessage(in DOMString aMessage);

  /**
   * The nsIDOMWorkerMessageListener which handles messages for this worker.
   * 
   * Developers should set this attribute to a proper object before another
   * worker begins sending messages to ensure that all messages are received.
   */
  attribute nsIDOMWorkerMessageListener messageListener;

  /**
   * The nsIDOMWorkerErrorListener which handles errors in child threads.
   *
   * Developers should set this attribute to a proper object before calling
   * createWorker in order to catch parse errors as well as runtime exceptions.
   */
  attribute nsIDOMWorkerErrorListener errorListener;

  /**
   * Create a new worker object by evaluating the given script.
   *
   * @param aSourceScript (in DOMString)
   *        The script to compile. See below for details on the scope in which
   *        the script will run.
   */
  nsIDOMWorkerThread createWorker(in DOMString aSourceScript);

  /**
   * Create a new worker object by evaluating the given script.
   *
   * @param aSourceURL (in AString)
   *        The script url to load and compile. See below for details on the
   *        scope in which the script will run.
   */
  nsIDOMWorkerThread createWorkerFromURL(in AString aSourceURL);
};

[scriptable, uuid(0f2a52ea-afc9-49e6-86dd-2d0cb65b5dd5)]
interface nsIDOMThreadService : nsISupports
{
  /**
   * Creates a new DOM worker pool.
   */
  nsIDOMWorkerPool createPool();
};

[scriptable, uuid(fcf387be-a7e3-4283-8bc5-06bfe13c5e8c)]
interface nsIDOMWorkerThreadContext : nsISupports
{
  readonly attribute nsIDOMWorkerThread thisThread;
};