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// Stilts stomp-client.js 0.1.40
// Some parts (c) 2010 Jeff Mesnil -- http://jmesnil.net/
// 0.1.40

var Stomp = {

  Headers: {
    HOST : 'host',
    CONTENT_LENGTH : 'content-length',
    CONTENT_TYPE : 'content-type',
    ACCEPT_VERSION : 'accept-version',
    VERSION : 'version'
  },
  
  Transport: {
  
  },
  
  Transports: [],

  unmarshal: function(data) {
    var divider     = data.search(/\n\n/);
    var headerLines = data.substring(0, divider).split('\n');
    var command     = headerLines.shift(), headers = {}, body = '';
  
    // Parse headers
    var line = idx = null;
    for ( var i = 0; i < headerLines.length; i++) {
      line = '' + headerLines[i];
      idx = line.indexOf(':');
      headers[line.substring(0, idx).trim()] = line.substring(idx + 1).trim();
    }
    try {
      if (headers[Stomp.Headers.CONTENT_LENGTH]) {
        var len = parseInt( headers[Stomp.Headers.CONTENT_LENGTH] );
        var start = divider + 2;
        // content-length is bytes, substring operates on characters
        body = Stomp.bytes_to_chars(Stomp.chars_to_bytes('' + data).substring(start, start+len))
      } else {
        // Parse body, stopping at the first \0 found.
        var chr = null;
        for ( var i = divider + 2; i < data.length; i++) {
          chr = data.charAt(i);
          if (chr === '\0') {
            break;
          }
          body += chr;
        }
      }
      return Stomp.frame(command, headers, body);
    } catch (err) {
      return Stomp.frame('ERROR', headers, "Error parsing frame: " + err.description);
    }
  },

  marshal: function(command, headers, body) {
    var frame = Stomp.frame(command, headers, body);
    return frame.toString() + '\0';
  },
  
  frame: function(command, headers, body) {
    return {
      command : command,
      headers : headers,
      body : body,
      toString : function() {
        var out = command + '\n';
        if (headers) {
          for (header in headers) {
            if (header != 'content-length' && headers.hasOwnProperty(header)) {
              out = out + header + ':' + headers[header] + '\n';
            }
          }
        }
        if (body) {
          out = out + 'content-length:' + Stomp.chars_to_bytes(body).length + '\n';
        }
        out = out + '\n';
        if (body) {
          out = out + body;
        }
        return out;
      }
    }
  },

  chars_to_bytes: function(chars) {
    return unescape(encodeURIComponent(chars));
  },

  bytes_to_chars: function(bytes) {
    return decodeURIComponent(escape(bytes));
  },

  logger: ( function() {
    if (typeof(console) == 'undefined') {
      return { log: function() { }, debug: function() { } };
    } else {
      return console;
    }
  } )()
  
};

Stomp


Stomp.Client = function(host, port, secure) {
  this._host   = host   || Stomp.DEFAULT_HOST;
  this._port   = port   || Stomp.DEFAULT_PORT || 8675;
  this._secure = secure || Stomp.DEFAULT_SECURE_FLAG || false;
}

Stomp.Client.prototype = {

  Versions: { 
    VERSION_1_0 : "1.0", 
    VERSION_1_1 : "1.1",
  
  },
  
  supportedVersions : function() {
    return "1.0,1.1";
  },
  
  connect: function(callback) {
    if ( arguments.length == 1 ) {
      this._connectCallback = arguments[0];
    }
    if ( arguments.length == 2 ) {
      this._connectCallback = arguments[0];
      this._errorCallback = arguments[1];
    }
    if ( arguments.length == 3 ) {
      this._login = arguments[0];
      this._passcode = arguments[1];
      this._connectCallback = arguments[2];
    }
    if ( arguments.length == 4 ) {
      this._login = arguments[0];
      this._passcode = arguments[1];
      this._connectCallback = arguments[2];
      this._errorCallback = arguments[3];
    }
    
    this._connectTransport(callback);
    
  },
  
  _connectTransport: function(callback) {
    var transports = [];
    for ( i = 0 ; i < Stomp.Transports.length ; ++i ) {
       var t = new Stomp.Transports[i]( this._host, this._port, this._secure );
       t.client = this;
       transports.push( t );
     }
     
     this._buildConnector( transports, 0, callback )();
  },
  
  
  _buildConnector: function(transports, i, callback) {
    var client = this;
    if ( i+1 < transports.length ) {
      return function() {
        var fallback = client._buildConnector( transports, i+1, callback );
        try {
          transports[i].connect( function() {
            client._transport = transports[i];
            callback();
          }, fallback );
        } catch (err) {
          fallback();
        }
      };
    } else if ( i < transports.length ) {
      return function() {
        var fallback = client.connectionFailed.bind( this );
        try {
          transports[i].connect( function() {
            client._transport = transports[i];
            callback();
          }, client.connectionFailed.bind( this ) );
        } catch(err) {
          fallback();
        }
      };
    } else {
      return function() {
        client.connectionFailed(this);
      };
    }
  },
  
  connectionFailed: function() {
    Stomp.logger.log( "unable to connect" );
  },
  
  disconnect: function(disconnectCallback) {
    this._transmit("DISCONNECT");
    this._transport.close();
    if (disconnectCallback) {
      disconnectCallback();
    }
  },
  
  send: function(destination, headers, body) {
    var headers = headers || {};
    headers.destination = destination;
    this._transmit("SEND", headers, body);
  },
  
  subscribe: function(destination, callback, headers) {
    var headers = headers || {};
    var subscription_id = "sub-" + this._counter++;
    headers.destination = destination;
    headers.id = subscription_id;
    this._subscriptions['' + subscription_id] = callback;
    this._transmit("SUBSCRIBE", headers);
    return subscription_id;
  },
  
  unsubscribe: function(id, headers) {
    var headers = headers || {};
    headers.id = id;
    delete this._subscriptions[id];
    this._transmit("UNSUBSCRIBE", headers);
  },

  begin: function(transaction, headers) {
    var headers = headers || {};
    headers.transaction = transaction;
    this._transmit("BEGIN", headers);
  },

  commit: function(transaction, headers) {
    var headers = headers || {};
    headers.transaction = transaction;
    this._transmit("COMMIT", headers);
  },

  abort: function(transaction, headers) {
    var headers = headers || {};
    headers.transaction = transaction;
    this._transmit("ABORT", headers);
  },

  ack: function(message_id, headers) {
    var headers = headers || {};
    headers["message-id"] = message_id;
    this._transmit("ACK", headers);
  },
		
  nack: function(message_id, headers) {
    // TODO: Add nack functionality.
  },
  
  // ----------------------------------------
  processMessage: function(message) {
    if (message.command == "MESSAGE") {
      var subId = message.headers['subscription'];
      var callback = this._subscriptions[ subId ];
      callback(message);
    } else if (message.command == "RECEIPT" && this.onreceipt) {
      this.onreceipt(message);
    } else if (message.command == "ERROR" && this.onerror) {
      this.onerror(message);
    }
  },
  // ----------------------------------------
  
  _login: undefined,
  _passcode: undefined,
  _connectCallback: undefined,
  _errorCallback: undefined,
  _webSocketEnabled: true,
  _longPollEnabled: true,
  
  _transport: undefined,
  _subscriptions: {},
  _counter: 0,
  
  _transmit: function(command, headers, body) {
	this._transport.transmit(command, headers, body);
  },
  
}
Stomp.Transport.WebSocket = function(host, port, secure) {
  this._host = host;
  this._port = port;
  this._secure = secure;
}

Stomp.Transport.WebSocket.prototype = {
  _ws: undefined,
  _state: 'unconnected',
  
  transmit: function(command, headers, body) {
    var out = Stomp.marshal(command, headers, body);
    this._ws.send(out);
  },
  
  connect: function(callback, errorCallback) {
    var wsClass = null;
    if ( typeof WebSocket != 'undefined' ) {
      wsClass = WebSocket;
    } else if ( typeof MozWebSocket != 'undefined' ) {
      wsClass = MozWebSocket;
    } else {
      return;
    }
    
    this._connectCallback = callback;
    this._ws = new wsClass( this._url() );
    this._ws.onopen = this._issueConnect.bind(this);
    this._ws.onmessage = this._handleMessage.bind(this);
    this._ws.onerror = errorCallback;
  },
  
  close: function() {
    this._ws.close(); 
  },
  
  send: function(data) {
    this._ws.send(data);
  },
  
  _issueConnect: function() {
    var headers = {};
    if ( this._login ) {
      headers['login'] = this._login;
    }
    if ( this._passcode ) {
      headers['passcode'] = this._passcode;
    }
    Stomp.logger.debug( this.client );
    headers[Stomp.Headers.ACCEPT_VERSION] = this.client.supportedVersions();
    this.transmit( "CONNECT", headers)
  },
  
  _handleMessage: function(evt) {
    var frame = Stomp.unmarshal(evt.data);
    if (frame.command == "CONNECTED") {
      this._version = frame.headers[Stomp.Headers.VERSION];
      if (this._connectCallback) {
        this._connectCallback(frame);
      }
    } else {
      this.client.processMessage( frame );
    }
  },
  
  _url: function() {
    if ( this._secure ) {
      return "wss://" + this._host + ":" + this._port + "/";
    }
    return "ws://" + this._host + ":" + this._port + "/";
  },
}


Stomp.Transports.push( Stomp.Transport.WebSocket );



// ---------------------------------------------------------------
// Third-party Libraries
// ---------------------------------------------------------------

/*	SWFObject v2.2 <http://code.google.com/p/swfobject/> 
	is released under the MIT License <http://www.opensource.org/licenses/mit-license.php> 
*/
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// Copyright: Hiroshi Ichikawa <http://gimite.net/en/>
// License: New BSD License
// Reference: http://dev.w3.org/html5/websockets/
// Reference: http://tools.ietf.org/html/rfc6455

WEB_SOCKET_SUPPRESS_CROSS_DOMAIN_SWF_ERROR = true;

(function() {
  
  if (window.WEB_SOCKET_FORCE_FLASH) {
    // Keeps going.
  } else if (window.WebSocket) {
    return;
  } else if (window.MozWebSocket) {
    // Firefox.
    window.WebSocket = MozWebSocket;
    return;
  }
  
  var logger;
  if (window.WEB_SOCKET_LOGGER) {
    logger = WEB_SOCKET_LOGGER;
  } else if (window.console && window.console.log && window.console.error) {
    // In some environment, console is defined but console.log or console.error is missing.
    logger = window.console;
  } else {
    logger = {log: function(){ }, error: function(){ }};
  }
  
  // swfobject.hasFlashPlayerVersion("10.0.0") doesn't work with Gnash.
  if (swfobject.getFlashPlayerVersion().major < 10) {
    logger.error("Flash Player >= 10.0.0 is required.");
    return;
  }
  if (location.protocol == "file:") {
    logger.error(
      "WARNING: web-socket-js doesn't work in file:///... URL " +
      "unless you set Flash Security Settings properly. " +
      "Open the page via Web server i.e. http://...");
  }

  /**
   * Our own implementation of WebSocket class using Flash.
   * @param {string} url
   * @param {array or string} protocols
   * @param {string} proxyHost
   * @param {int} proxyPort
   * @param {string} headers
   */
  window.WebSocket = function(url, protocols, proxyHost, proxyPort, headers) {
    var self = this;
    self.__id = WebSocket.__nextId++;
    WebSocket.__instances[self.__id] = self;
    self.readyState = WebSocket.CONNECTING;
    self.bufferedAmount = 0;
    self.__events = {};
    if (!protocols) {
      protocols = [];
    } else if (typeof protocols == "string") {
      protocols = [protocols];
    }
    // Uses setTimeout() to make sure __createFlash() runs after the caller sets ws.onopen etc.
    // Otherwise, when onopen fires immediately, onopen is called before it is set.
    self.__createTask = setTimeout(function() {
      WebSocket.__addTask(function() {
        self.__createTask = null;
        WebSocket.__flash.create(
            self.__id, url, protocols, proxyHost || null, proxyPort || 0, headers || null);
      });
    }, 0);
  };

  /**
   * Send data to the web socket.
   * @param {string} data  The data to send to the socket.
   * @return {boolean}  True for success, false for failure.
   */
  WebSocket.prototype.send = function(data) {
    if (this.readyState == WebSocket.CONNECTING) {
      throw "INVALID_STATE_ERR: Web Socket connection has not been established";
    }
    // We use encodeURIComponent() here, because FABridge doesn't work if
    // the argument includes some characters. We don't use escape() here
    // because of this:
    // https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Functions#escape_and_unescape_Functions
    // But it looks decodeURIComponent(encodeURIComponent(s)) doesn't
    // preserve all Unicode characters either e.g. "\uffff" in Firefox.
    // Note by wtritch: Hopefully this will not be necessary using ExternalInterface.  Will require
    // additional testing.
    var result = WebSocket.__flash.send(this.__id, encodeURIComponent(data));
    if (result < 0) { // success
      return true;
    } else {
      this.bufferedAmount += result;
      return false;
    }
  };

  /**
   * Close this web socket gracefully.
   */
  WebSocket.prototype.close = function() {
    if (this.__createTask) {
      clearTimeout(this.__createTask);
      this.__createTask = null;
      this.readyState = WebSocket.CLOSED;
      return;
    }
    if (this.readyState == WebSocket.CLOSED || this.readyState == WebSocket.CLOSING) {
      return;
    }
    this.readyState = WebSocket.CLOSING;
    WebSocket.__flash.close(this.__id);
  };

  /**
   * Implementation of {@link <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-registration">DOM 2 EventTarget Interface</a>}
   *
   * @param {string} type
   * @param {function} listener
   * @param {boolean} useCapture
   * @return void
   */
  WebSocket.prototype.addEventListener = function(type, listener, useCapture) {
    if (!(type in this.__events)) {
      this.__events[type] = [];
    }
    this.__events[type].push(listener);
  };

  /**
   * Implementation of {@link <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-registration">DOM 2 EventTarget Interface</a>}
   *
   * @param {string} type
   * @param {function} listener
   * @param {boolean} useCapture
   * @return void
   */
  WebSocket.prototype.removeEventListener = function(type, listener, useCapture) {
    if (!(type in this.__events)) return;
    var events = this.__events[type];
    for (var i = events.length - 1; i >= 0; --i) {
      if (events[i] === listener) {
        events.splice(i, 1);
        break;
      }
    }
  };

  /**
   * Implementation of {@link <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-registration">DOM 2 EventTarget Interface</a>}
   *
   * @param {Event} event
   * @return void
   */
  WebSocket.prototype.dispatchEvent = function(event) {
    var events = this.__events[event.type] || [];
    for (var i = 0; i < events.length; ++i) {
      events[i](event);
    }
    var handler = this["on" + event.type];
    if (handler) handler.apply(this, [event]);
  };

  /**
   * Handles an event from Flash.
   * @param {Object} flashEvent
   */
  WebSocket.prototype.__handleEvent = function(flashEvent) {
    
    if ("readyState" in flashEvent) {
      this.readyState = flashEvent.readyState;
    }
    if ("protocol" in flashEvent) {
      this.protocol = flashEvent.protocol;
    }
    
    var jsEvent;
    if (flashEvent.type == "open" || flashEvent.type == "error") {
      jsEvent = this.__createSimpleEvent(flashEvent.type);
    } else if (flashEvent.type == "close") {
      jsEvent = this.__createSimpleEvent("close");
      jsEvent.wasClean = flashEvent.wasClean ? true : false;
      jsEvent.code = flashEvent.code;
      jsEvent.reason = flashEvent.reason;
    } else if (flashEvent.type == "message") {
      var data = decodeURIComponent(flashEvent.message);
      jsEvent = this.__createMessageEvent("message", data);
    } else {
      throw "unknown event type: " + flashEvent.type;
    }
    
    this.dispatchEvent(jsEvent);
    
  };
  
  WebSocket.prototype.__createSimpleEvent = function(type) {
    if (document.createEvent && window.Event) {
      var event = document.createEvent("Event");
      event.initEvent(type, false, false);
      return event;
    } else {
      return {type: type, bubbles: false, cancelable: false};
    }
  };
  
  WebSocket.prototype.__createMessageEvent = function(type, data) {
    if (document.createEvent && window.MessageEvent && !window.opera) {
      var event = document.createEvent("MessageEvent");
      event.initMessageEvent("message", false, false, data, null, null, window, null);
      return event;
    } else {
      // IE and Opera, the latter one truncates the data parameter after any 0x00 bytes.
      return {type: type, data: data, bubbles: false, cancelable: false};
    }
  };
  
  /**
   * Define the WebSocket readyState enumeration.
   */
  WebSocket.CONNECTING = 0;
  WebSocket.OPEN = 1;
  WebSocket.CLOSING = 2;
  WebSocket.CLOSED = 3;

  // Field to check implementation of WebSocket.
  WebSocket.__isFlashImplementation = true;
  WebSocket.__initialized = false;
  WebSocket.__flash = null;
  WebSocket.__instances = {};
  WebSocket.__tasks = [];
  WebSocket.__nextId = 0;
  
  /**
   * Load a new flash security policy file.
   * @param {string} url
   */
  WebSocket.loadFlashPolicyFile = function(url){
    WebSocket.__addTask(function() {
      WebSocket.__flash.loadManualPolicyFile(url);
    });
  };

  /**
   * Loads WebSocketMain.swf and creates WebSocketMain object in Flash.
   */
  WebSocket.__initialize = function() {
    
    if (WebSocket.__initialized) return;
    WebSocket.__initialized = true;
    
    if (WebSocket.__swfLocation) {
      // For backword compatibility.
      window.WEB_SOCKET_SWF_LOCATION = WebSocket.__swfLocation;
    }
    if (!window.WEB_SOCKET_SWF_LOCATION) {
      logger.error("[WebSocket] set WEB_SOCKET_SWF_LOCATION to location of WebSocketMain.swf");
      return;
    }
    if (!window.WEB_SOCKET_SUPPRESS_CROSS_DOMAIN_SWF_ERROR &&
        !WEB_SOCKET_SWF_LOCATION.match(/(^|\/)WebSocketMainInsecure\.swf(\?.*)?$/) &&
        WEB_SOCKET_SWF_LOCATION.match(/^\w+:\/\/([^\/]+)/)) {
      var swfHost = RegExp.$1;
      if (location.host != swfHost) {
        logger.error(
            "[WebSocket] You must host HTML and WebSocketMain.swf in the same host " +
            "('" + location.host + "' != '" + swfHost + "'). " +
            "See also 'How to host HTML file and SWF file in different domains' section " +
            "in README.md. If you use WebSocketMainInsecure.swf, you can suppress this message " +
            "by WEB_SOCKET_SUPPRESS_CROSS_DOMAIN_SWF_ERROR = true;");
      }
    }
    var container = document.createElement("div");
    container.id = "webSocketContainer";
    // Hides Flash box. We cannot use display: none or visibility: hidden because it prevents
    // Flash from loading at least in IE. So we move it out of the screen at (-100, -100).
    // But this even doesn't work with Flash Lite (e.g. in Droid Incredible). So with Flash
    // Lite, we put it at (0, 0). This shows 1x1 box visible at left-top corner but this is
    // the best we can do as far as we know now.
    container.style.position = "absolute";
    if (WebSocket.__isFlashLite()) {
      container.style.left = "0px";
      container.style.top = "0px";
    } else {
      container.style.left = "-100px";
      container.style.top = "-100px";
    }
    var holder = document.createElement("div");
    holder.id = "webSocketFlash";
    container.appendChild(holder);
    document.body.appendChild(container);
    // See this article for hasPriority:
    // http://help.adobe.com/en_US/as3/mobile/WS4bebcd66a74275c36cfb8137124318eebc6-7ffd.html
    swfobject.embedSWF(
      WEB_SOCKET_SWF_LOCATION,
      "webSocketFlash",
      "1" /* width */,
      "1" /* height */,
      "10.0.0" /* SWF version */,
      null,
      null,
      {hasPriority: true, swliveconnect : true, allowScriptAccess: "always"},
      null,
      function(e) {
        if (!e.success) {
          logger.error("[WebSocket] swfobject.embedSWF failed");
        }
      }
    );
    
  };
  
  /**
   * Called by Flash to notify JS that it's fully loaded and ready
   * for communication.
   */
  WebSocket.__onFlashInitialized = function() {
    // We need to set a timeout here to avoid round-trip calls
    // to flash during the initialization process.
    setTimeout(function() {
      WebSocket.__flash = document.getElementById("webSocketFlash");
      WebSocket.__flash.setCallerUrl(location.href);
      WebSocket.__flash.setDebug(!!window.WEB_SOCKET_DEBUG);
      for (var i = 0; i < WebSocket.__tasks.length; ++i) {
        WebSocket.__tasks[i]();
      }
      WebSocket.__tasks = [];
    }, 0);
  };
  
  /**
   * Called by Flash to notify WebSockets events are fired.
   */
  WebSocket.__onFlashEvent = function() {
    setTimeout(function() {
      try {
        // Gets events using receiveEvents() instead of getting it from event object
        // of Flash event. This is to make sure to keep message order.
        // It seems sometimes Flash events don't arrive in the same order as they are sent.
        var events = WebSocket.__flash.receiveEvents();
        for (var i = 0; i < events.length; ++i) {
          WebSocket.__instances[events[i].webSocketId].__handleEvent(events[i]);
        }
      } catch (e) {
        logger.error(e);
      }
    }, 0);
    return true;
  };
  
  // Called by Flash.
  WebSocket.__log = function(message) {
    logger.log(decodeURIComponent(message));
  };
  
  // Called by Flash.
  WebSocket.__error = function(message) {
    logger.error(decodeURIComponent(message));
  };
  
  WebSocket.__addTask = function(task) {
    if (WebSocket.__flash) {
      task();
    } else {
      WebSocket.__tasks.push(task);
    }
  };
  
  /**
   * Test if the browser is running flash lite.
   * @return {boolean} True if flash lite is running, false otherwise.
   */
  WebSocket.__isFlashLite = function() {
    if (!window.navigator || !window.navigator.mimeTypes) {
      return false;
    }
    var mimeType = window.navigator.mimeTypes["application/x-shockwave-flash"];
    if (!mimeType || !mimeType.enabledPlugin || !mimeType.enabledPlugin.filename) {
      return false;
    }
    return mimeType.enabledPlugin.filename.match(/flashlite/i) ? true : false;
  };
  
  if (!window.WEB_SOCKET_DISABLE_AUTO_INITIALIZATION) {
    // NOTE:
    //   This fires immediately if web_socket.js is dynamically loaded after
    //   the document is loaded.
    swfobject.addDomLoadEvent(function() {
      WebSocket.__initialize();
    });
  }
  
})();

// ----------------------------------------
// HTTP Transport
// ----------------------------------------

Stomp.Transport.HTTP = function(host, port, secure) {
  this._host = host;
  this._port = port;
  this._secure = secure;
}

Stomp.Transport.HTTP.prototype = {

  _receiverRequest: undefined,
  _disconnectReceiver: false,
  
  connect: function(callback, errorCallback) {
    var headers = {};
    if ( this._login ) {
      headers.login = this._login;
    }
    if ( this._passcode ) {
      headers.passcode = this._passcode;
    }
    
    headers[Stomp.Headers.ACCEPT_VERSION] = this.client.supportedVersions();
    
    var transport = this;
    
    var request = new XMLHttpRequest();
    request.open( "POST", this._url(), true );
    request.withCredentials = true;
    
    var timeoutHandle = setTimeout( function() {
      if ( request.readyState != 0 && request.readyState != 4 ) {
        request.abort();
        errorCallack();
      }
    }, 5000 );
    
    request.onerror = errorCallback;
    
    request.onload = function() {
      clearTimeout( timeoutHandle );
      transport.connectMessageReceiver();
      callback();
    }
    request.setRequestHeader("Content-type","text/stomp");
    
    var data = Stomp.marshal("CONNECT", headers);
    request.send(data);
  },

  connectMessageReceiver: function() {
    var transport = this;
    try {
      this._eventSource = new EventSource( this._url(), { withCredentials: true } );
      this._eventSource.withCredentials = true;
      this._eventSource.onerror = function() {
        transport._eventSource.close();
        transport._eventSource = undefined;
        transport.connectLongPoll();
      };
      this._eventSource.onopen = function() {
        transport._eventSource.onerror = undefined; 
      };
      this._eventSource.onmessage = function(e) {
        var message = Stomp.unmarshal( e.data );
        transport.client.processMessage( message );
      };
    } catch (err) {
      Stomp.logger.debug( err );
      this._eventSource.close();
      this._eventSource = undefined;
      this.connectLongPoll();
    }
  },
  
  connectLongPoll: function() {
    var transport = this;
  
    var request = new XMLHttpRequest();
    request.open( "GET", this._url(), true );
    request.onload = function() {
      var message = Stomp.unmarshal( request.response );
      transport.client.processMessage( message );
    }
  
    request.onloadend = function() {
      if ( transport._disconnectReceiver ) {
        return;
      }
      transport.connectLongPoll();
    }
    
    setTimeout( function() {
      if ( request.readyState != 0 && request.readyState != 4 ) {
        request.abort();
      }
    }, 10000 );
    
    request.setRequestHeader("Accept","text/stomp-poll");
    request.withCredentials = true;
    request.send();
    this._receiverRequest = request;
  },

  disconnectMessageReceiver: function() {
    this._disconnectReceiver = true;
    if ( this._eventSource ) {
      this._eventSource.close();
      this._eventSource = undefined;
    }
    if ( this._receiverRequest ) {
      this._receiverRequest.abort();
      this._receiverRequest = undefined;
    }
  },

  close: function() {
    this.disconnectMessageReceiver();
  },

  transmit: function(command, headers, body, callbacks, timeoutMs) {
    var data = Stomp.marshal(command, headers, body);
    this.send(data, callbacks, timeoutMs);
  },
  
  send: function(data, callbacks) {
    callbacks = callbacks || {};
    var request = new XMLHttpRequest();
    request.open( "POST", this._url(), true );
    request.withCredentials = true;
    Stomp.logger.debug( request );
    if ( callbacks['load'] ) {
      request.onload = function() {
        callbacks['load'](request);
      }
    }
    if ( callbacks['error'] ) {
      request.onerror = function() {
        callbacks['error'](request);
      }
    }
    request.setRequestHeader("Content-type","text/stomp");
    request.send(data);
  },
  
  _url: function() {
    if ( this._secure ) {
      return "https://" + this._host + ":" + this._port + "/";
    }
    return "http://" + this._host + ":" + this._port + "/";
  },
  
};

Stomp.Transports.push( Stomp.Transport.HTTP );
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