364 lines
8.4 KiB
JavaScript
364 lines
8.4 KiB
JavaScript
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(function($)
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{
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var msgHandshake =
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{
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version: '1.0',
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minimumVersion: '0.9',
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channel: '/meta/handshake'
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};
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var oTransport = function()
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{
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this._bXD =
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(($.comet._sUrl.substring(0,4) == 'http') && ($.comet._sUrl.substr(7,location.href.length).replace(/\/.*/, '') != location.host))
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?
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true
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:false;
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this.connectionType = (this._bXD) ? 'callback-polling' : 'long-polling';
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this.startup = function(oReturn)
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{
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if(this._comet._bConnected) return;
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this.tunnelInit();
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};
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this.tunnelInit = function()
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{
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var msgConnect =
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{
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channel: '/meta/connect',
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clientId: $.comet.clientId,
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id: String($.comet._nNextId++),
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connectionType: $.comet._oTransport.connectionType
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};
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this.openTunnel(msgConnect);
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};
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this.openTunnel = function(oMsg)
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{
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$.comet._bPolling = true;
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this._send($.comet._sUrl, oMsg, function(sReturn)
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{
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var oReturn = (typeof sReturn != "object") ? (eval('(' + sReturn + ')')) : sReturn;
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$.comet._bPolling = false;
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$.comet.deliver(oReturn);
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$.comet._oTransport.closeTunnel();
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});
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};
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this.closeTunnel = function()
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{
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if(!$.comet._bInitialized) return;
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if($.comet._advice)
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{
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if($.comet._advice.reconnect == 'none') return;
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if($.comet._advice.interval > 0)
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{
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setTimeout($.comet._oTransport._connect, $.comet._advice.interval);
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}
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else
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{
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$.comet._oTransport._connect();
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}
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}
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else
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{
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$.comet._oTransport._connect();
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}
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};
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this._connect = function()
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{
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if(!$.comet._bInitialized) return;
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if($.comet._bPolling) return;
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if($.comet._advice && $.comet._advice.reconnect == 'handshake')
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{
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$.comet._bConnected = false;
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$.comet.init($.comet._sUrl);
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}
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else if($.comet._bConnected)
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{
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var msgConnect =
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{
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//jsonp: 'test',
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clientId: $.comet.clientId,
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id: String($.comet._nNextId++),
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channel: '/meta/connect',
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connectionType: $.comet._oTransport.connectionType
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};
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$.comet._oTransport.openTunnel(msgConnect);
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}
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};
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this._send = function(sUrl, oMsg, fCallback) {
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//default callback will check advice, deliver messages, and reconnect
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var fCallback = (fCallback) ? fCallback : function(sReturn)
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{
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var oReturn = (typeof sReturn != "object") ? (eval('(' + sReturn + ')')) : sReturn;
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$.comet.deliver(oReturn);
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if($.comet._advice)
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{
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if($.comet._advice.reconnect == 'none')
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return;
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if($.comet._advice.interval > 0)
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{
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setTimeout($.comet._oTransport._connect, $.comet._advice.interval);
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}
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else
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{
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$.comet._oTransport._connect();
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}
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}
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else
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{
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$.comet._oTransport._connect();
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}
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};
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//regular AJAX for same domain calls
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if((!this._bXD) && (this.connectionType == 'long-polling'))
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{
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this._pollRequest = $.ajax({
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url: sUrl,
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type: 'post',
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beforeSend: function(oXhr) { oXhr.setRequestHeader('Connection', 'Keep-Alive'); },
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data: { message: JSON.stringify(oMsg) },
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success: fCallback
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});
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}
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else // JSONP callback for cross domain
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{
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this._pollRequest = $.ajax({
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url: sUrl,
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dataType: 'jsonp',
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jsonp: 'jsonp',
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beforeSend: function(oXhr) { oXhr.setRequestHeader('Connection', 'Keep-Alive'); },
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data:
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{
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message: JSON.stringify($.extend(oMsg,{connectionType: 'callback-polling' }))
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},
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success: fCallback
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});
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}
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}
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};
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$.comet = new function()
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{
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this.CONNECTED = 'CONNECTED';
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this.CONNECTING = 'CONNECTING';
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this.DISCONNECTED = 'DISCONNECTED';
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this.DISCONNECTING = 'DISCONNECTING';
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this._aMessageQueue = [];
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this._aSubscriptions = [];
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this._aSubscriptionCallbacks = [];
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this._bInitialized = false;
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this._bConnected = false;
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this._nBatch = 0;
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this._nNextId = 0;
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// just define the transport, do not assign it yet.
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this._oTransport = ''; //oTransport;
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this._sUrl = '';
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this.supportedConectionTypes = [ 'long-polling', 'callback-polling' ];
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this.clientId = '';
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this._bTrigger = true; // this sends $.event.trigger(channel, data)
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this.init = function(sUrl)
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{
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this._sUrl = (sUrl) ? sUrl : '/cometd';
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this._oTransport = new oTransport();
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this._aMessageQueue = [];
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this._aSubscriptions = [];
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this._bInitialized = true;
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this.startBatch();
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var oMsg = $.extend(msgHandshake, {id: String(this._nNextId++)});
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this._oTransport._send(this._sUrl, oMsg, $.comet._finishInit);
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};
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this._finishInit = function(sReturn)
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{
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var oReturn = (typeof sReturn != "object") ? (eval('(' + sReturn + ')')[0]) : sReturn[0];
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if(oReturn.advice)
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$.comet._advice = oReturn.advice;
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var bSuccess = (oReturn.successful) ? oReturn.successful : false;
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// do version check
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if(bSuccess)
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{
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// pick transport ?
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// ......
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$.comet._oTransport._comet = $.comet;
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$.comet._oTransport.version = $.comet.version;
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$.comet.clientId = oReturn.clientId;
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$.comet._oTransport.startup(oReturn);
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$.comet.endBatch();
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}
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};
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this._sendMessage = function(oMsg)
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{
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if($.comet._nBatch <= 0)
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{
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if(oMsg.length > 0)
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for(var i in oMsg)
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{
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oMsg[i].clientId = String($.comet.clientId);
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oMsg[i].id = String($.comet._nNextId++);
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}
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else
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{
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oMsg.clientId = String($.comet.clientId);
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oMsg.id = String($.comet._nNextId++);
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}
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$.comet._oTransport._send($.comet._sUrl, oMsg);
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}
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else
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{
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$.comet._aMessageQueue.push(oMsg);
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}
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};
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this.startBatch = function() { this._nBatch++ };
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this.endBatch = function() {
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if(--this._nBatch <= 0)
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{
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this._nBatch = 0;
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if(this._aMessageQueue.length > 0)
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{
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this._sendMessage(this._aMessageQueue);
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this._aMessageQueue = [];
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}
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}
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};
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this.subscribe = function(sSubscription, fCallback)
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{
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// if this topic has not been subscribed to yet, send the message now
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if(!this._aSubscriptions[sSubscription])
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{
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this._aSubscriptions.push(sSubscription)
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if (fCallback) {
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this._aSubscriptionCallbacks[sSubscription] = fCallback;
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}
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this._sendMessage({ channel: '/meta/subscribe', subscription: sSubscription });
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}
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//$.event.add(window, sSubscription, fCallback);
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};
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this.unsubscribe = function(sSubscription) {
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$.comet._sendMessage({ channel: '/meta/unsubscribe', subscription: sSubscription });
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};
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this.publish = function(sChannel, oData)
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{
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$.comet._sendMessage({channel: sChannel, data: oData});
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};
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this.deliver = function(sReturn)
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{
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var oReturn = sReturn;//eval(sReturn);
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$(oReturn).each(function()
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{
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$.comet._deliver(this);
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});
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};
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this.disconnect = function()
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{
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$($.comet._aSubscriptions).each(function(i)
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{
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$.comet.unsubscribe($.comet._aSubscriptions[i]);
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});
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$.comet._sendMessage({channel:'/meta/disconnect'});
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$.comet._bInitialized = false;
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}
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this._deliver = function(oMsg,oData)
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{
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if(oMsg.advice)
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{
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$.comet._advice = oMsg.advice;
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}
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switch(oMsg.channel)
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{
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case '/meta/connect':
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if(oMsg.successful && !$.comet._bConnected)
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{
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$.comet._bConnected = $.comet._bInitialized;
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$.comet.endBatch();
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/*
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$.comet._sendMessage(msgConnect);
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*/
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}
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else
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{}
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//$.comet._bConnected = false;
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break;
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// add in subscription handling stuff
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case '/meta/subscribe':
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if(!oMsg.successful)
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{
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$.comet._oTransport._cancelConnect();
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return;
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}
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break;
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case '/meta/unsubscribe':
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if(!oMsg.successful)
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{
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$.comet._oTransport._cancelConnect();
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return;
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}
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break;
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}
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if(oMsg.data)
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{
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if($.comet._bTrigger)
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{
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$.event.trigger(oMsg.channel, [oMsg]);
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}
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var cb = $.comet._aSubscriptionCallbacks[oMsg.channel];
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if (cb) {
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cb(oMsg);
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}
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}
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};
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};
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})(jQuery);
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