From 1c5685d68f1b73270fb814fe04cbb490eb90ba5f Mon Sep 17 00:00:00 2001 From: mensonge Date: Fri, 14 Nov 2008 15:39:19 +0000 Subject: Minor fix: Remove DOJO library (60Mo) replaced by link to Google CDN (online DOJO library) git-svn-id: https://semanticscuttle.svn.sourceforge.net/svnroot/semanticscuttle/trunk@159 b3834d28-1941-0410-a4f8-b48e95affb8f --- includes/js/dojox/cometd/timesync.js | 126 ----------------------------------- 1 file changed, 126 deletions(-) delete mode 100644 includes/js/dojox/cometd/timesync.js (limited to 'includes/js/dojox/cometd/timesync.js') diff --git a/includes/js/dojox/cometd/timesync.js b/includes/js/dojox/cometd/timesync.js deleted file mode 100644 index 44ef241..0000000 --- a/includes/js/dojox/cometd/timesync.js +++ /dev/null @@ -1,126 +0,0 @@ -if(!dojo._hasResource["dojox.cometd.timesync"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code. -dojo._hasResource["dojox.cometd.timesync"] = true; -dojo.provide("dojox.cometd.timesync"); -dojo.require("dojox.cometd"); - -/** - * this file provides the time synchronization extension to cometd. - * Timesync allows the client and server to exchange time information on every - * handshake and connect message so that the client may calculate an approximate - * offset from it's own clock epoch to that of the server. - * - * With each handshake or connect, the extension sends timestamps within the - * ext field like: {ext:{timesync:{tc:12345567890},...},...} - * where ts is the timestamp in ms since 1970 of when the message was sent. - * - * A cometd server that supports timesync, should respond with and ext field - * like: {ext:{timesync:{tc:12345567890,ts:1234567900,p:123},...},...} - * where ts is the timestamp sent by the client, te is the timestamp on the server - * of when the message was received and p is the poll duration in ms - ie the - * time the server took before sending the response. - * - * On receipt of the response, the client is able to use current time to determine - * the total trip time, from which p is subtracted to determine an approximate - * two way network traversal time. The assumption is made that the network is - * symmetric for traversal time, so the offset between the two clocks is - * ts-tc-(now-tc-p)/2. In practise networks (and the cometd client/server software) - * is never perfectly symmetric, so accuracy is limited by the difference, which - * can be 10s of milliseconds. - * - * In order to smooth over any transient fluctuations, the extension keeps a sliding - * average of the offsets received. By default this is over 10 messages, but this can - * be changed with the dojox.cometd.timesync._window element. - */ -dojox.cometd.timesync= new function(){ - - this._window=10;// The window size for the sliding average of offset samples. - this._minWindow=4;// The window size for the sliding average of offset samples. - this._offsets=new Array(); // The samples used to calculate the average offset. - this.offset=0; // The offset in ms between the clients clock and the servers clock. Add this to the local - // time epoch to obtain server time. - this.samples=0; // The number of samples used to calculate the offset. If 0, the offset is not valid. - - this.getServerTime=function(){ // return: long - // Summary: - // Calculate the current time on the server - // - return new Date().getTime()+this.offset; - } - - this.getServerDate=function(){ // return: Date - // Summary: - // Calculate the current time on the server - // - return new Date(this.getServerTime()); - } - - this.setTimeout=function(/*function*/call,/*long|Date*/atTimeOrDate){ - // Summary: - // Set a timeout function relative to server time - // call: - // the function to call when the timeout occurs - // atTimeOrTime: - // a long timestamp or a Date representing the server time at - // which the timeout should occur. - - var ts=(atTimeOrDate instanceof Date)?atTimeOrDate.getTime():(0+atTimeOrDate); - var tc=ts-this.offset; - var interval=tc-new Date().getTime(); - if (interval<=0) - interval=1; - return setTimeout(call,interval); - } - - this._in=function(/*Object*/msg){ - // Summary: - // Handle incoming messages for the timesync extension. - // description: - // Look for ext:{timesync:{}} field and calculate offset if present. - // msg: - // The incoming bayeux message - - var channel=msg.channel; - if (channel && channel.indexOf('/meta/')==0){ - if (msg.ext && msg.ext.timesync){ - var sync=msg.ext.timesync; - var now=new Date().getTime(); - - this._offsets.push(sync.ts-sync.tc-(now-sync.tc-sync.p)/2); - if (this._offsets.length>this._window) - this._offsets.shift(); - this.samples++; - var total=0; - for (var i in this._offsets) - total+=this._offsets[i]; - this.offset=parseInt((total/this._offsets.length).toFixed()); - - if (this.samples