From 5e6eb27f843a22b80ac114f382682fba0c37589e Mon Sep 17 00:00:00 2001 From: Evan Prodromou Date: Sat, 25 Apr 2009 14:20:24 -0400 Subject: first pass at Comet plugin; doesn't yet update --- plugins/Comet/jquery.comet.js | 363 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 363 insertions(+) create mode 100644 plugins/Comet/jquery.comet.js (limited to 'plugins/Comet/jquery.comet.js') 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); -- cgit v1.2.3-54-g00ecf