source: [view]
dojo.provide("dojox.cometd.longPollTransportFormEncoded");
dojo.require("dojox.cometd._base");
dojox.cometd.longPollTransportFormEncoded = new function(){
// This is an alternative implementation to that provided in logPollTransport.js that
// form encodes all messages instead of sending them as text/json
this._connectionType = "long-polling";
this._cometd = null;
this.check = function(types, version, xdomain){
return ((!xdomain)&&(dojo.indexOf(types, "long-polling") >= 0));
}
this.tunnelInit = function(){
var message = {
channel: "/meta/connect",
clientId: this._cometd.clientId,
connectionType: this._connectionType,
id: "" + this._cometd.messageId++
};
message = this._cometd._extendOut(message);
this.openTunnelWith({ message: dojo.toJson([message]) });
}
this.tunnelCollapse = function(){
// TODO handle transport specific advice
if(!this._cometd._initialized){ return; }
if(this._cometd._advice && this._cometd._advice["reconnect"]=="none"){
return;
}
var interval = this._cometd._interval();
if (this._cometd._status=="connected") {
setTimeout(dojo.hitch(this, "_connect"), interval);
}else{
setTimeout(dojo.hitch(this._cometd, function(){
this.init(this.url, this._props);
}), interval);
}
}
this._connect = function(){
if(!this._cometd._initialized){ return; }
if(this._cometd._polling) { return; }
if((this._cometd._advice) && (this._cometd._advice["reconnect"]=="handshake")){
this._cometd._status="unconnected"; //?
this._initialized = false;
this._cometd.init(this._cometd.url, this._cometd._props);
}else if(this._cometd._status=="connected"){
var message = {
channel: "/meta/connect",
connectionType: this._connectionType,
clientId: this._cometd.clientId,
id: "" + this._cometd.messageId++
};
if(this._cometd.connectTimeout>=this._cometd.expectedNetworkDelay){
message.advice = {
timeout: this._cometd.connectTimeout - this._cometd.expectedNetworkDelay
};
}
message = this._cometd._extendOut(message);
this.openTunnelWith({ message: dojo.toJson([message]) });
}
}
this.deliver = function(message){
// Nothing to do
}
this.openTunnelWith = function(content, url){
this._cometd._polling = true;
var post = {
url: (url||this._cometd.url),
content: content,
handleAs: this._cometd.handleAs,
load: dojo.hitch(this, function(data){
this._cometd._polling=false;
this._cometd.deliver(data);
this._cometd._backon();
this.tunnelCollapse();
}),
error: dojo.hitch(this, function(err){
var metaMsg = {
failure: true,
error: err,
advice: this._cometd._advice
};
this._cometd._polling=false;
this._cometd._publishMeta("connect",false, metaMsg);
this._cometd._backoff();
this.tunnelCollapse();
})
};
var connectTimeout = this._cometd._connectTimeout();
if(connectTimeout > 0){
post.timeout = connectTimeout;
}
this._poll = dojo.xhrPost(post);
}
this.sendMessages = function(messages){
for(var i=0; i < messages.length; i++){
messages[i].clientId = this._cometd.clientId;
messages[i].id = "" + this._cometd.messageId++;
messages[i]= this._cometd._extendOut(messages[i]);
}
return dojo.xhrPost({
url: this._cometd.url||dojo.config["cometdRoot"],
handleAs: this._cometd.handleAs,
load: dojo.hitch(this._cometd, "deliver"),
content: { message: dojo.toJson(messages) },
error: dojo.hitch(this, function(err){
this._cometd._publishMeta("publish",false,{messages:messages});
}),
timeout: this._cometd.expectedNetworkDelay
});
}
this.startup = function(handshakeData){
if(this._cometd._status=="connected"){ return; }
this.tunnelInit();
}
this.disconnect = function(){
var message = {
channel: "/meta/disconnect",
clientId: this._cometd.clientId,
id: "" + this._cometd.messageId++
};
message = this._cometd._extendOut(message);
dojo.xhrPost({
url: this._cometd.url || dojo.config["cometdRoot"],
handleAs: this._cometd.handleAs,
content: { message: dojo.toJson([message]) }
});
}
this.cancelConnect = function(){
if(this._poll){
this._poll.cancel();
this._cometd._polling=false;
this._cometd._publishMeta("connect",false,{cancel:true});
this._cometd._backoff();
this.disconnect();
this.tunnelCollapse();
}
}