first pass at Comet plugin; doesn't yet update

1 files changed, 363 insertions, 0 deletions

diff --git a/plugins/Comet/jquery.comet.js b/plugins/Comet/jquery.comet.js
new file mode 100644
index 000000000..2124e882c
--- /dev/null
+++ b/plugins/Comet/jquery.comet.js
@@ -0,0 +1,363 @@
+(function($)

+{

+	var msgHandshake =

+	{

+		version: '1.0',

+		minimumVersion: '0.9',

+		channel: '/meta/handshake'

+	};

+

+	var oTransport = function()

+	{

+		this._bXD = 

+			(($.comet._sUrl.substring(0,4) == 'http') && ($.comet._sUrl.substr(7,location.href.length).replace(/\/.*/, '') != location.host))

+			?

+			true

+			:false;

+

+		this.connectionType = (this._bXD) ? 'callback-polling' : 'long-polling';

+

+		this.startup = function(oReturn)

+		{

+			if(this._comet._bConnected) return;

+			this.tunnelInit();

+		};

+

+		this.tunnelInit = function()

+		{

+			var msgConnect = 

+			{

+				channel: '/meta/connect',

+				clientId: $.comet.clientId, 

+				id: String($.comet._nNextId++),

+				connectionType: $.comet._oTransport.connectionType

+			};

+

+			this.openTunnel(msgConnect);

+		};

+

+		this.openTunnel = function(oMsg)

+		{

+			$.comet._bPolling = true;

+

+			this._send($.comet._sUrl, oMsg, function(sReturn)

+			{

+				var oReturn = (typeof sReturn != "object") ? (eval('(' + sReturn + ')')) : sReturn;

+				$.comet._bPolling = false;

+				$.comet.deliver(oReturn);

+				$.comet._oTransport.closeTunnel();

+			});

+		};

+

+		this.closeTunnel = function()

+		{

+			if(!$.comet._bInitialized) return;

+

+			if($.comet._advice)

+			{

+				if($.comet._advice.reconnect == 'none') return;

+

+				if($.comet._advice.interval > 0)

+				{

+					setTimeout($.comet._oTransport._connect, $.comet._advice.interval);

+				}

+				else

+				{

+					$.comet._oTransport._connect();

+				}

+			}

+			else

+			{

+				$.comet._oTransport._connect();

+			}

+		};

+

+		this._connect = function()

+		{

+			if(!$.comet._bInitialized) return;

+

+			if($.comet._bPolling) return;

+

+			if($.comet._advice && $.comet._advice.reconnect == 'handshake')

+			{

+				$.comet._bConnected = false;

+				$.comet.init($.comet._sUrl);

+			}

+			else if($.comet._bConnected)

+			{

+				var msgConnect = 

+				{

+					//jsonp: 'test',

+					clientId: $.comet.clientId,

+					id: String($.comet._nNextId++),

+					channel: '/meta/connect',

+					connectionType: $.comet._oTransport.connectionType

+				};

+				$.comet._oTransport.openTunnel(msgConnect);

+			}

+		};

+

+		this._send = function(sUrl, oMsg, fCallback) {

+			//default callback will check advice, deliver messages, and reconnect

+			var fCallback = (fCallback) ? fCallback : function(sReturn)

+			{

+				var oReturn = (typeof sReturn != "object") ? (eval('(' + sReturn + ')')) : sReturn;

+

+				$.comet.deliver(oReturn);

+

+				if($.comet._advice)

+				{

+					if($.comet._advice.reconnect == 'none')

+						return;

+

+					if($.comet._advice.interval > 0)

+					{

+						setTimeout($.comet._oTransport._connect, $.comet._advice.interval);

+					}

+					else

+					{

+						$.comet._oTransport._connect();

+					}

+				}

+				else

+				{

+					$.comet._oTransport._connect();

+				}

+			};

+

+			//regular AJAX for same domain calls

+			if((!this._bXD) && (this.connectionType == 'long-polling'))

+			{

+				this._pollRequest = $.ajax({

+					url: sUrl,

+					type: 'post',

+					beforeSend: function(oXhr) { oXhr.setRequestHeader('Connection', 'Keep-Alive'); },

+					data: { message: JSON.stringify(oMsg) },

+					success: fCallback

+				});

+			}

+			else // JSONP callback for cross domain

+			{

+				this._pollRequest = $.ajax({

+					url: sUrl,

+					dataType: 'jsonp',

+					jsonp: 'jsonp',

+					beforeSend: function(oXhr) { oXhr.setRequestHeader('Connection', 'Keep-Alive'); },

+					data: 

+					{ 

+						message: JSON.stringify($.extend(oMsg,{connectionType: 'callback-polling' })) 

+					},

+					success: fCallback

+				});

+			}

+		}

+        };

+

+	$.comet = new function()

+	{

+		this.CONNECTED = 'CONNECTED';

+		this.CONNECTING = 'CONNECTING';

+		this.DISCONNECTED = 'DISCONNECTED';

+		this.DISCONNECTING = 'DISCONNECTING';

+

+		this._aMessageQueue = [];

+		this._aSubscriptions = [];

+		this._aSubscriptionCallbacks = [];

+		this._bInitialized = false;

+		this._bConnected = false;

+		this._nBatch = 0;

+		this._nNextId = 0;

+		// just define the transport, do not assign it yet.

+		this._oTransport = ''; //oTransport;

+		this._sUrl = '';

+

+		this.supportedConectionTypes = [ 'long-polling', 'callback-polling' ];

+

+		this.clientId = '';

+

+		this._bTrigger = true; // this sends $.event.trigger(channel, data)

+

+		this.init = function(sUrl)

+		{

+			this._sUrl = (sUrl) ? sUrl : '/cometd';

+

+			this._oTransport = new oTransport();

+

+			this._aMessageQueue = [];

+			this._aSubscriptions = [];

+			this._bInitialized = true;

+			this.startBatch();

+

+			var oMsg = $.extend(msgHandshake, {id: String(this._nNextId++)});

+

+			this._oTransport._send(this._sUrl, oMsg, $.comet._finishInit);

+		};

+

+		this._finishInit = function(sReturn)

+		{

+			var oReturn = (typeof sReturn != "object") ? (eval('(' + sReturn + ')')[0]) : sReturn[0];

+

+			if(oReturn.advice)

+				$.comet._advice = oReturn.advice;

+

+			var bSuccess = (oReturn.successful) ? oReturn.successful : false;

+			// do version check

+

+			if(bSuccess)

+			{

+				// pick transport ?

+				// ......

+

+				$.comet._oTransport._comet = $.comet;

+				$.comet._oTransport.version = $.comet.version;

+

+				$.comet.clientId = oReturn.clientId;

+				$.comet._oTransport.startup(oReturn);

+				$.comet.endBatch();

+			}

+		};

+

+		this._sendMessage = function(oMsg)

+		{

+			if($.comet._nBatch <= 0)

+			{

+				if(oMsg.length > 0)

+					for(var i in oMsg)

+					{

+						oMsg[i].clientId = String($.comet.clientId);

+						oMsg[i].id = String($.comet._nNextId++);

+					}

+				else

+				{

+					oMsg.clientId = String($.comet.clientId);

+					oMsg.id = String($.comet._nNextId++);

+				}

+

+				$.comet._oTransport._send($.comet._sUrl, oMsg);

+			}

+			else

+			{

+				$.comet._aMessageQueue.push(oMsg);

+			}

+		};

+

+

+		this.startBatch = function() { this._nBatch++ };

+		this.endBatch = function() {

+			if(--this._nBatch <= 0)

+			{

+				this._nBatch = 0;

+				if(this._aMessageQueue.length > 0)

+				{

+					this._sendMessage(this._aMessageQueue);

+					this._aMessageQueue = [];

+				}

+			}

+		};

+

+		this.subscribe = function(sSubscription, fCallback)

+		{

+			// if this topic has not been subscribed to yet, send the message now

+			if(!this._aSubscriptions[sSubscription])

+			{

+				this._aSubscriptions.push(sSubscription)

+

+				if (fCallback) {

+					this._aSubscriptionCallbacks[sSubscription] = fCallback;

+				}

+

+				this._sendMessage({ channel: '/meta/subscribe', subscription: sSubscription });

+			}

+

+			//$.event.add(window, sSubscription, fCallback);

+		};

+

+		this.unsubscribe = function(sSubscription) {

+			$.comet._sendMessage({ channel: '/meta/unsubscribe', subscription: sSubscription });

+		};

+

+		this.publish = function(sChannel, oData)

+		{

+			$.comet._sendMessage({channel: sChannel, data: oData});

+		};

+

+		this.deliver = function(sReturn)

+		{

+			var oReturn = sReturn;//eval(sReturn);

+

+			$(oReturn).each(function()

+			{

+					$.comet._deliver(this);

+			});

+		};

+

+		this.disconnect = function()

+		{

+			$($.comet._aSubscriptions).each(function(i)

+			{

+				$.comet.unsubscribe($.comet._aSubscriptions[i]);

+			});

+

+			$.comet._sendMessage({channel:'/meta/disconnect'});

+

+			$.comet._bInitialized = false;

+		}

+

+		this._deliver = function(oMsg,oData)

+		{

+			if(oMsg.advice)

+			{

+				$.comet._advice = oMsg.advice;

+			}

+

+			switch(oMsg.channel)

+			{

+				case '/meta/connect':

+					if(oMsg.successful && !$.comet._bConnected)

+					{

+						$.comet._bConnected = $.comet._bInitialized;

+						$.comet.endBatch();

+					/*

+					   $.comet._sendMessage(msgConnect);

+					*/

+					}

+					else

+					{}

+						//$.comet._bConnected = false;

+				break;

+

+				// add in subscription handling stuff

+				case '/meta/subscribe':

+                                        if(!oMsg.successful)

+                                        {

+                                                $.comet._oTransport._cancelConnect();

+                                                return;

+                                        }

+				break;

+

+				case '/meta/unsubscribe':

+                                        if(!oMsg.successful)

+                                        {

+                                                $.comet._oTransport._cancelConnect();

+                                                return;

+                                        }

+				break;

+

+			}

+

+		if(oMsg.data)

+		{

+			if($.comet._bTrigger)

+			{

+				$.event.trigger(oMsg.channel, [oMsg]);

+			}

+

+			var cb = $.comet._aSubscriptionCallbacks[oMsg.channel];

+			if (cb) {

+				cb(oMsg);

+			}

+		}

+	};

+};

+

+})(jQuery);