trunk/public_html/meteor.js

// Set domain at highest level
var domainparts = document.domain.split(".");
document.domain = domainparts[domainparts.length-2]+"."+domainparts[domainparts.length-1];

Function.prototype.bind = function(obj) {
        var method = this,
        temp = function() {
                return method.apply(obj, arguments);
        };
        return temp;
}
Function.prototype.andThen=function(g) {
        var f=this;
        var a=this.arguments
        return function(args) {
                f(a);g(args);
        }
};

function Meteor(instID) {

        this.transferDoc = false;
        this.pingtimer = false;
        this.updatepollfreqtimer = false;
        this.lastrequest = 0;
        this.recvtimes = [];
        this.MHostId = false;
        this.callback_process = function() {};
        this.callback_reset = function() {};
        this.callback_eof = function() {};
        this.callback_changemode = function() {};
        this.callback_statuschanged = function() {};
        this.persist = true;
        this.frameloadtimer = false;
        this.debugmode = false;
        this.subsurl = false;
        this.channels = {};
        this.channelcount = 0;
        this.streamreq = false;
        this.byteoffset = 0;

        // Documented public properties
        this.subdomain = "data";
        this.dynamicpageaddress = "push";
        this.smartpoll = true;
        this.pollfreq = 2000;
        this.minpollfreq = 2000;
        this.mode = "poll";
        this.polltimeout = 30000;
        this.pingtimeout = 10000;
        this.maxmessages = 0;
        this.status = 0;

        /* Statuses:    0 = Uninitialised,
                                        1 = Loading stream,
                                        2 = Loading controller frame,
                                        3 = Controller frame timeout, retrying.
                                        4 = Controller frame loaded and ready
                                        5 = Receiving data
        */

        this.instID = (typeof(instID) != "undefined") ? instID : 0;
        this.MHostId = Math.floor(Math.random()*100000000)+""+this.instID;
}

Meteor.instances = new Array();

Meteor.create = function(instID) {
        if (!instID) instID = Meteor.instances.length;
        Meteor.instances[instID] = new Meteor(instID);
        return Meteor.instances[instID];
}

Meteor.register = function(ifr) {
        instid = new String(ifr.window.frameElement.id);
        instid = instid.replace(/.*_([0-9]*)$/, "$1");
        ifr.p = this.instances[instid].process.bind(this.instances[instid]);
        ifr.r = this.instances[instid].reset.bind(this.instances[instid]);
        ifr.eof = this.instances[instid].eof.bind(this.instances[instid]);
        ifr.get = this.instances[instid].get.bind(this.instances[instid]);
        ifr.increasepolldelay = this.instances[instid].increasepolldelay.bind(this.instances[instid]);
        clearTimeout(this.instances[instid].frameloadtimer);
        this.instances[instid].setstatus(4);
        if (this.debugmode) console.log("Frame registered");
}

Meteor.reset = function(ifr) {
        instid = new String(ifr.window.frameElement.id);
        instid = instid.replace(/.*_([0-9]*)$/, "$1");
        this.instances[instid].reset();
}

Meteor.prototype.joinChannel = function(channelname, backtrack) {
        if (typeof(this.channels[channelname]) != "undefined") throw "Cannot join channel "+channelname+": already subscribed";
        this.channels[channelname] = {backtrack:backtrack, lastmsgreceived:0};
        if (this.debugmode) console.log("Joined channel "+channelname+", channel list follows");
        if (this.debugmode) console.log(this.channels);
        if (this.status != 0) this.start();
        this.channelcount++;
}

Meteor.prototype.leaveChannel = function(channelname) {
        if (typeof(this.channels[channelname]) == "undefined") throw "Cannot leave channel "+channelname+": not subscribed";
        delete this.channels[channelname];
        if (this.status != 0) this.start();
        this.channelcount--;
}

Meteor.prototype.start = function() {
        this.persist = (this.maxmessages)?1:0;
        this.smartpoll = (this.smartpoll)?1:0;
        this.mode = (this.mode=="stream")?"stream":"poll";
        if (!this.subdomain || !this.channelcount) throw "Channel or Meteor subdomain host not specified";
        this.stop();
        var now = new Date();
        var t = now.getTime();
        this.setstatus(1);
        this.updateSubsUrl();
        if (this.mode=="stream") {
                if (document.all) {
                        this.createIframe(this.subsurl);
                } else {
                        this.createIframe("http://"+this.subdomain+"."+location.hostname+"/stream.html");
                }
                var f = this.pollmode.bind(this);
                clearTimeout(this.pingtimer);
                this.pingtimer = setTimeout(f, this.pingtimeout);

        } else {
                this.createIframe("http://"+this.subdomain+"."+location.hostname+"/poll.html&nc="+t);
                this.recvtimes[0] = t;
                if (this.updatepollfreqtimer) clearTimeout(this.updatepollfreqtimer);
                this.updatepollfreqtimer = setInterval(this.updatepollfreq.bind(this), 2500);
        }
        this.lastrequest = t;
}

Meteor.prototype.updateSubsUrl = function() {
        var surl = "http://" + this.subdomain + "." + location.hostname + "/" + this.dynamicpageaddress + "?id=" + this.MHostId;
        if (this.maxmessages && this.persist && this.mode != "stream") surl += "&maxmessages=" + this.maxmessages;
        if (this.mode == "poll" && this.maxmessages == 0 && this.persist==1) this.persist=0;
        surl += "&persist="+this.persist;
        for (var c in this.channels) {
                surl += "&channel="+c;
                if (this.channels[c].lastmsgreceived > 0) {
                        surl += "&restartfrom="+(this.channels[c].lastmsgreceived+1);
                } else if (this.channels[c].backtrack > 0) {
                        surl += "&backtrack="+this.channels[c].backtrack;
                } else if (this.channels[c].backtrack < 0 || isNaN(this.channels[c].backtrack)) {
                        surl += "&restartfrom=";
                }
        }
        this.subsurl = surl;
}

Meteor.prototype.createIframe = function(url) {
        if (document.all) {
                this.transferDoc = new ActiveXObject("htmlfile");
                this.transferDoc.open();
                this.transferDoc.write("<html>");
                this.transferDoc.write("<script>document.domain=\""+(document.domain)+"\";</"+"script>");
                this.transferDoc.write("</html>");
                this.transferDoc.parentWindow.Meteor = Meteor;
                this.transferDoc.close();
                var ifrDiv = this.transferDoc.createElement("div");
                this.transferDoc.appendChild(ifrDiv);
                ifrDiv.innerHTML = "<iframe id=\"meteorframe_"+this.instID+"\" src=\""+url+"\" style=\"display: none;\"></iframe>";
        } else {
                var ifr = document.createElement("IFRAME");
                ifr.style.width = "10px";
                ifr.style.height = "10px";
                ifr.style.border = "none";
                ifr.style.position = "absolute";
                ifr.style.top = "-10px";
                ifr.style.marginTop = "-10px";
                ifr.style.zIndex = "-20";
                ifr.setAttribute("id", "meteorframe_"+this.instID);
                ifr.Meteor = Meteor;
                if (document.compatMode=='CSS1Compat') {
                        var innerifr = document.createElement("IFRAME");
                        innerifr.setAttribute("src", url);
                        innerifr.setAttribute("id", "meteorinnerframe_"+this.instID);
                        ifr.appendChild(innerifr);
                        document.body.appendChild(ifr);
                } else {
                        ifr.setAttribute("src", url);
                        document.body.appendChild(ifr);
                }
        }
        if (this.debugmode) console.log("Loading URL '"+url+"' into frame...");
        var f = this.frameloadtimeout.bind(this);
        this.frameloadtimer = setTimeout(f, 5000);
}

Meteor.prototype.stop = function() {
        if (typeof(this.transferDoc)=="object") {
                this.transferDoc = false;
        }
        if (document.getElementById("meteorframe_"+this.instID)) {
                document.getElementById("meteorframe_"+this.instID).src="about:blank";
                document.body.removeChild(document.getElementById("meteorframe_"+this.instID));
        }
        clearTimeout(this.pingtimer);
        clearTimeout(this.updatepollfreqtimer);
        clearTimeout(this.frameloadtimer);
        this.setstatus(0);
}

Meteor.prototype.pollmode = function() {
        if (this.debugmode) console.log("Ping timeout");
        this.mode="poll";
        this.start();
        this.callback_changemode("poll");
        this.lastpingtime = false;
}

Meteor.prototype.process = function(id, channel, data) {
        if (id == -1) {
                if (this.debugmode) console.log("Ping");
                this.ping();
        } else if (typeof(this.channels[channel]) != "undefined" && id > this.channels[channel].lastmsgreceived) {
                if (this.debugmode) console.log("Message "+id+" received on channel "+channel+" (last id on channel: "+this.channels[channel].lastmsgreceived+")\n"+data);
                this.callback_process(data);
                this.channels[channel].lastmsgreceived = id;
                if (this.mode=="poll") {
                        var now = new Date();
                        var t = now.getTime();
                        this.recvtimes[this.recvtimes.length] = t;
                        while (this.recvtimes.length > 5) this.recvtimes.shift();
                }
        }
        this.updateSubsUrl();
        this.setstatus(5);
}

Meteor.prototype.ping = function() {
        if (this.mode=="stream" && this.pingtimer) {
                clearTimeout(this.pingtimer);
                var f = this.pollmode.bind(this);
                this.pingtimer = setTimeout(f, this.pingtimeout);
                var now = new Date();
                this.lastpingtime = now.getTime();
        }
        this.setstatus(5);
}

Meteor.prototype.reset = function() {
        if (this.debugmode) console.log("Stream reset");
        var now = new Date();
        var t = now.getTime();
        var x = this.pollfreq - (t-this.lastrequest);
        if (x < 10) x = 10;
        this.ping();
        this.callback_reset();
        setTimeout(this.start.bind(this), x);
}

Meteor.prototype.eof = function() {
        this.callback_eof();
}

Meteor.prototype.get = function(varname) {
        eval("var a = this."+varname+";");
        if (typeof(a) == "undefined") throw "Cannot get value of "+varname;
        return a;
}

Meteor.prototype.increasepolldelay = function() {
        this.pollfreq *= 2;
}

Meteor.prototype.updatepollfreq = function() {
        if (this.smartpoll) {
                var now = new Date();
                var t = now.getTime();
                var avg = 0;
                for (var i=1; i<this.recvtimes.length; i++) {
                        var x = (this.recvtimes[i]-this.recvtimes[i-1]);
                        avg += (x>60000)? 60000 : x;
                }
                x = (t-this.recvtimes[this.recvtimes.length-1]);
                avg += (x>180000)? 180000 : x;
                avg /= this.recvtimes.length;
                if ((avg/3) < this.pollfreq && (avg/3) >= this.minpollfreq) this.pollfreq = Math.ceil(this.pollfreq*0.9);
                if ((avg/3) > this.pollfreq) this.pollfreq = Math.floor(this.pollfreq*1.05);
        }
}

Meteor.prototype.registerEventCallback = function(evt, funcRef) {
        if (evt=="process") {
                this.callback_process = (this.callback_process).andThen(funcRef);
        } else if (evt=="reset") {
                this.callback_reset = (this.callback_reset).andThen(funcRef);
        } else if (evt=="eof") {
                this.callback_eof = (this.callback_eof).andThen(funcRef);
        } else if (evt=="changemode") {
                this.callback_changemode = (this.callback_changemode).andThen(funcRef);
        } else if (evt=="changestatus") {
                this.callback_statuschanged = (this.callback_statuschanged).andThen(funcRef);
        }
}

Meteor.prototype.frameloadtimeout = function() {
        if (this.debugmode) console.log("Frame load timeout");
        if (this.frameloadtimer) clearTimeout(this.frameloadtimer);
        this.setstatus(3);
        setTimeout(this.start.bind(this), 5000);
}
Meteor.prototype.setstatus = function(newstatus) {
        if (this.status != newstatus) {
                this.status = newstatus;
                this.callback_statuschanged(newstatus);
        }
}


Meteor.createCookie = function(name,value,days) {
        if (days) {
                var date = new Date();
                date.setTime(date.getTime()+(days*24*60*60*1000));
                var expires = "; expires="+date.toGMTString();
        }
        else var expires = "";
        document.cookie = name+"="+value+expires+"; path=/";
}

Meteor.readCookie = function(name) {
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for(var i=0;i < ca.length;i++) {
                var c = ca[i];
                while (c.charAt(0)==' ') c = c.substring(1,c.length);
                if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
        }
        return null;
}

Meteor.eraseCookie = function(name) {
        createCookie(name,"",-1);
}
1	andrew.betts	6	// Set domain at highest level
2			var domainparts = document.domain.split(".");
3			document.domain = domainparts[domainparts.length-2]+"."+domainparts[domainparts.length-1];
4
5			Function.prototype.bind = function(obj) {
6			var method = this,
7			temp = function() {
8			return method.apply(obj, arguments);
9			};
10			return temp;
11			}
12			Function.prototype.andThen=function(g) {
13			var f=this;
14			var a=this.arguments
15			return function(args) {
16			f(a);g(args);
17			}
18			};
19
20			function Meteor(instID) {
21
22			this.transferDoc = false;
23			this.pingtimer = false;
24			this.updatepollfreqtimer = false;
25			this.lastrequest = 0;
26	andrew.betts	19	this.recvtimes = [];
27	andrew.betts	6	this.MHostId = false;
28			this.callback_process = function() {};
29			this.callback_reset = function() {};
30			this.callback_eof = function() {};
31			this.callback_changemode = function() {};
32	andrew.betts	7	this.callback_statuschanged = function() {};
33	andrew.betts	6	this.persist = true;
34	andrew.betts	7	this.frameloadtimer = false;
35	andrew.betts	14	this.debugmode = false;
36	andrew.betts	18	this.subsurl = false;
37	andrew.betts	19	this.channels = {};
38	andrew.betts	21	this.channelcount = 0;
39			this.streamreq = false;
40			this.byteoffset = 0;
41	andrew.betts	6
42			// Documented public properties
43			this.subdomain = "data";
44			this.dynamicpageaddress = "push";
45			this.smartpoll = true;
46			this.pollfreq = 2000;
47			this.minpollfreq = 2000;
48	andrew.betts	14	this.mode = "poll";
49	andrew.betts	23	this.polltimeout = 30000;
50	andrew.betts	6	this.pingtimeout = 10000;
51	andrew.betts	18	this.maxmessages = 0;
52	andrew.betts	7	this.status = 0;
53	andrew.betts	6
54	andrew.betts	7	/* Statuses: 0 = Uninitialised,
55			1 = Loading stream,
56			2 = Loading controller frame,
57	andrew.betts	14	3 = Controller frame timeout, retrying.
58	andrew.betts	7	4 = Controller frame loaded and ready
59			5 = Receiving data
60			*/
61
62	andrew.betts	6	this.instID = (typeof(instID) != "undefined") ? instID : 0;
63	andrew.betts	14	this.MHostId = Math.floor(Math.random()*100000000)+""+this.instID;
64	andrew.betts	6	}
65
66			Meteor.instances = new Array();
67
68			Meteor.create = function(instID) {
69	andrew.betts	9	if (!instID) instID = Meteor.instances.length;
70	andrew.betts	6	Meteor.instances[instID] = new Meteor(instID);
71			return Meteor.instances[instID];
72			}
73
74			Meteor.register = function(ifr) {
75			instid = new String(ifr.window.frameElement.id);
76	andrew.betts	14	instid = instid.replace(/._([0-9])$/, "$1");
77	andrew.betts	6	ifr.p = this.instances[instid].process.bind(this.instances[instid]);
78			ifr.r = this.instances[instid].reset.bind(this.instances[instid]);
79			ifr.eof = this.instances[instid].eof.bind(this.instances[instid]);
80			ifr.get = this.instances[instid].get.bind(this.instances[instid]);
81			ifr.increasepolldelay = this.instances[instid].increasepolldelay.bind(this.instances[instid]);
82	andrew.betts	7	clearTimeout(this.instances[instid].frameloadtimer);
83			this.instances[instid].setstatus(4);
84	andrew.betts	14	if (this.debugmode) console.log("Frame registered");
85	andrew.betts	6	}
86
87	andrew.betts	18	Meteor.reset = function(ifr) {
88			instid = new String(ifr.window.frameElement.id);
89			instid = instid.replace(/._([0-9])$/, "$1");
90			this.instances[instid].reset();
91			}
92
93			Meteor.prototype.joinChannel = function(channelname, backtrack) {
94			if (typeof(this.channels[channelname]) != "undefined") throw "Cannot join channel "+channelname+": already subscribed";
95			this.channels[channelname] = {backtrack:backtrack, lastmsgreceived:0};
96	andrew.betts	19	if (this.debugmode) console.log("Joined channel "+channelname+", channel list follows");
97			if (this.debugmode) console.log(this.channels);
98	andrew.betts	18	if (this.status != 0) this.start();
99	andrew.betts	21	this.channelcount++;
100	andrew.betts	18	}
101
102			Meteor.prototype.leaveChannel = function(channelname) {
103			if (typeof(this.channels[channelname]) == "undefined") throw "Cannot leave channel "+channelname+": not subscribed";
104			delete this.channels[channelname];
105			if (this.status != 0) this.start();
106	andrew.betts	21	this.channelcount--;
107	andrew.betts	18	}
108
109	andrew.betts	6	Meteor.prototype.start = function() {
110			this.persist = (this.maxmessages)?1:0;
111			this.smartpoll = (this.smartpoll)?1:0;
112			this.mode = (this.mode=="stream")?"stream":"poll";
113	andrew.betts	21	if (!this.subdomain \|\| !this.channelcount) throw "Channel or Meteor subdomain host not specified";
114	andrew.betts	14	this.stop();
115	andrew.betts	6	var now = new Date();
116			var t = now.getTime();
117	andrew.betts	14	this.setstatus(1);
118	andrew.betts	23	this.updateSubsUrl();
119	andrew.betts	18	if (this.mode=="stream") {
120	andrew.betts	21	if (document.all) {
121			this.createIframe(this.subsurl);
122			} else {
123			this.createIframe("http://"+this.subdomain+"."+location.hostname+"/stream.html");
124			}
125	andrew.betts	6	var f = this.pollmode.bind(this);
126			clearTimeout(this.pingtimer);
127			this.pingtimer = setTimeout(f, this.pingtimeout);
128
129			} else {
130	andrew.betts	23	this.createIframe("http://"+this.subdomain+"."+location.hostname+"/poll.html&nc="+t);
131	andrew.betts	14	this.recvtimes[0] = t;
132			if (this.updatepollfreqtimer) clearTimeout(this.updatepollfreqtimer);
133			this.updatepollfreqtimer = setInterval(this.updatepollfreq.bind(this), 2500);
134			}
135			this.lastrequest = t;
136			}
137
138	andrew.betts	23	Meteor.prototype.updateSubsUrl = function() {
139			var surl = "http://" + this.subdomain + "." + location.hostname + "/" + this.dynamicpageaddress + "?id=" + this.MHostId;
140			if (this.maxmessages && this.persist && this.mode != "stream") surl += "&maxmessages=" + this.maxmessages;
141			if (this.mode == "poll" && this.maxmessages == 0 && this.persist==1) this.persist=0;
142			surl += "&persist="+this.persist;
143			for (var c in this.channels) {
144			surl += "&channel="+c;
145			if (this.channels[c].lastmsgreceived > 0) {
146			surl += "&restartfrom="+(this.channels[c].lastmsgreceived+1);
147			} else if (this.channels[c].backtrack > 0) {
148			surl += "&backtrack="+this.channels[c].backtrack;
149			} else if (this.channels[c].backtrack < 0 \|\| isNaN(this.channels[c].backtrack)) {
150			surl += "&restartfrom=";
151			}
152			}
153			this.subsurl = surl;
154			}
155
156	andrew.betts	14	Meteor.prototype.createIframe = function(url) {
157			if (document.all) {
158			this.transferDoc = new ActiveXObject("htmlfile");
159			this.transferDoc.open();
160			this.transferDoc.write("<html>");
161			this.transferDoc.write("<script>document.domain=\""+(document.domain)+"\";</"+"script>");
162			this.transferDoc.write("</html>");
163			this.transferDoc.parentWindow.Meteor = Meteor;
164			this.transferDoc.close();
165			var ifrDiv = this.transferDoc.createElement("div");
166			this.transferDoc.appendChild(ifrDiv);
167			ifrDiv.innerHTML = "<iframe id=\"meteorframe_"+this.instID+"\" src=\""+url+"\" style=\"display: none;\"></iframe>";
168			} else {
169	andrew.betts	6	var ifr = document.createElement("IFRAME");
170			ifr.style.width = "10px";
171			ifr.style.height = "10px";
172			ifr.style.border = "none";
173	andrew.betts	14	ifr.style.position = "absolute";
174			ifr.style.top = "-10px";
175			ifr.style.marginTop = "-10px";
176			ifr.style.zIndex = "-20";
177			ifr.setAttribute("id", "meteorframe_"+this.instID);
178			ifr.Meteor = Meteor;
179	andrew.betts	21	if (document.compatMode=='CSS1Compat') {
180			var innerifr = document.createElement("IFRAME");
181			innerifr.setAttribute("src", url);
182			innerifr.setAttribute("id", "meteorinnerframe_"+this.instID);
183			ifr.appendChild(innerifr);
184			document.body.appendChild(ifr);
185			} else {
186			ifr.setAttribute("src", url);
187			document.body.appendChild(ifr);
188			}
189	andrew.betts	6	}
190	andrew.betts	14	if (this.debugmode) console.log("Loading URL '"+url+"' into frame...");
191			var f = this.frameloadtimeout.bind(this);
192			this.frameloadtimer = setTimeout(f, 5000);
193	andrew.betts	6	}
194
195	andrew.betts	9	Meteor.prototype.stop = function() {
196			if (typeof(this.transferDoc)=="object") {
197	andrew.betts	14	this.transferDoc = false;
198	andrew.betts	9	}
199			if (document.getElementById("meteorframe_"+this.instID)) {
200			document.getElementById("meteorframe_"+this.instID).src="about:blank";
201			document.body.removeChild(document.getElementById("meteorframe_"+this.instID));
202			}
203	andrew.betts	22	clearTimeout(this.pingtimer);
204			clearTimeout(this.updatepollfreqtimer);
205			clearTimeout(this.frameloadtimer);
206	andrew.betts	9	this.setstatus(0);
207			}
208
209	andrew.betts	6	Meteor.prototype.pollmode = function() {
210	andrew.betts	14	if (this.debugmode) console.log("Ping timeout");
211	andrew.betts	6	this.mode="poll";
212			this.start();
213			this.callback_changemode("poll");
214	andrew.betts	7	this.lastpingtime = false;
215	andrew.betts	6	}
216
217	andrew.betts	18	Meteor.prototype.process = function(id, channel, data) {
218	andrew.betts	19	if (id == -1) {
219			if (this.debugmode) console.log("Ping");
220			this.ping();
221			} else if (typeof(this.channels[channel]) != "undefined" && id > this.channels[channel].lastmsgreceived) {
222			if (this.debugmode) console.log("Message "+id+" received on channel "+channel+" (last id on channel: "+this.channels[channel].lastmsgreceived+")\n"+data);
223	andrew.betts	18	this.callback_process(data);
224			this.channels[channel].lastmsgreceived = id;
225	andrew.betts	6	if (this.mode=="poll") {
226			var now = new Date();
227			var t = now.getTime();
228			this.recvtimes[this.recvtimes.length] = t;
229			while (this.recvtimes.length > 5) this.recvtimes.shift();
230			}
231			}
232	andrew.betts	23	this.updateSubsUrl();
233	andrew.betts	7	this.setstatus(5);
234	andrew.betts	6	}
235
236			Meteor.prototype.ping = function() {
237			if (this.mode=="stream" && this.pingtimer) {
238			clearTimeout(this.pingtimer);
239			var f = this.pollmode.bind(this);
240			this.pingtimer = setTimeout(f, this.pingtimeout);
241			var now = new Date();
242			this.lastpingtime = now.getTime();
243			}
244	andrew.betts	7	this.setstatus(5);
245	andrew.betts	6	}
246
247			Meteor.prototype.reset = function() {
248	andrew.betts	14	if (this.debugmode) console.log("Stream reset");
249	andrew.betts	6	var now = new Date();
250			var t = now.getTime();
251			var x = this.pollfreq - (t-this.lastrequest);
252			if (x < 10) x = 10;
253			this.ping();
254			this.callback_reset();
255			setTimeout(this.start.bind(this), x);
256			}
257
258			Meteor.prototype.eof = function() {
259			this.callback_eof();
260			}
261
262			Meteor.prototype.get = function(varname) {
263			eval("var a = this."+varname+";");
264			if (typeof(a) == "undefined") throw "Cannot get value of "+varname;
265			return a;
266			}
267
268			Meteor.prototype.increasepolldelay = function() {
269			this.pollfreq *= 2;
270			}
271
272			Meteor.prototype.updatepollfreq = function() {
273			if (this.smartpoll) {
274			var now = new Date();
275			var t = now.getTime();
276			var avg = 0;
277			for (var i=1; i<this.recvtimes.length; i++) {
278			var x = (this.recvtimes[i]-this.recvtimes[i-1]);
279			avg += (x>60000)? 60000 : x;
280			}
281			x = (t-this.recvtimes[this.recvtimes.length-1]);
282			avg += (x>180000)? 180000 : x;
283			avg /= this.recvtimes.length;
284			if ((avg/3) < this.pollfreq && (avg/3) >= this.minpollfreq) this.pollfreq = Math.ceil(this.pollfreq*0.9);
285			if ((avg/3) > this.pollfreq) this.pollfreq = Math.floor(this.pollfreq*1.05);
286			}
287			}
288
289			Meteor.prototype.registerEventCallback = function(evt, funcRef) {
290			if (evt=="process") {
291			this.callback_process = (this.callback_process).andThen(funcRef);
292			} else if (evt=="reset") {
293			this.callback_reset = (this.callback_reset).andThen(funcRef);
294			} else if (evt=="eof") {
295			this.callback_eof = (this.callback_eof).andThen(funcRef);
296			} else if (evt=="changemode") {
297			this.callback_changemode = (this.callback_changemode).andThen(funcRef);
298	andrew.betts	7	} else if (evt=="changestatus") {
299			this.callback_statuschanged = (this.callback_statuschanged).andThen(funcRef);
300	andrew.betts	6	}
301			}
302
303	andrew.betts	7	Meteor.prototype.frameloadtimeout = function() {
304	andrew.betts	14	if (this.debugmode) console.log("Frame load timeout");
305	andrew.betts	7	if (this.frameloadtimer) clearTimeout(this.frameloadtimer);
306			this.setstatus(3);
307	andrew.betts	14	setTimeout(this.start.bind(this), 5000);
308	andrew.betts	7	}
309			Meteor.prototype.setstatus = function(newstatus) {
310			if (this.status != newstatus) {
311			this.status = newstatus;
312			this.callback_statuschanged(newstatus);
313			}
314			}
315	andrew.betts	6
316	andrew.betts	21
317	andrew.betts	6	Meteor.createCookie = function(name,value,days) {
318			if (days) {
319			var date = new Date();
320			date.setTime(date.getTime()+(days2460601000));
321			var expires = "; expires="+date.toGMTString();
322			}
323			else var expires = "";
324			document.cookie = name+"="+value+expires+"; path=/";
325			}
326
327			Meteor.readCookie = function(name) {
328			var nameEQ = name + "=";
329			var ca = document.cookie.split(';');
330			for(var i=0;i < ca.length;i++) {
331			var c = ca[i];
332			while (c.charAt(0)==' ') c = c.substring(1,c.length);
333			if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
334			}
335			return null;
336			}
337
338			Meteor.eraseCookie = function(name) {
339			createCookie(name,"",-1);
340	andrew.betts	21	}