 | | | Asynchronous Loadvars calls? | Asynchronous Loadvars calls?
2004-02-17 - By Ashley Rajaratnam
Back
Hi All-
The application in question currently uses the LoadVars object to call a
host server in a synchronous manner i.e.
1. call the host
2. lock screen input wait for response from server
3. get response/ or time out continue
this works fine however I 've decided update the application to allow the
user to asynchronously call the host i.e.
1. call the host
2. don 't wait allow user to call host again if he/she wants
3. handle the response and update interface as server
responses/come back
The code (pseudo) looks like this:
__ ____ ____ ____ ____ __
UI Class to capture events from interface
SomeUI.prototype.UIRequestToHost = function (CallID) {
this.GatewayModel.callHost(CallID);
}
__ ____ ____ ____ ____ ___
Model Controller class actually does the calls
GatewayModel.prototype.callHost = function(callerid) {
var objLoadVars;
objLoadVars = new LoadVars();
objLoadVars.returnID = callerid;
objLoadVars.onLoad = function(success) {
if(success){
_global.gateway.hostResult(objLoadVars);
} else {
_global.gateway.hostFailed();
}
}
//send and load the data
objLoadVars.sendAndLoad(( "http://blah/pause10seconds.asp "),objLoadVars,
"POST ");
}
Pretty simply...
I 'm encountering a strange behaviour which makes me believe that the
Loadvars object shares a single connection or queues the calls to the
host.
I call
UIRequestToHost() which in turn invokes callHost()
Multiple times within a second / pretty much instantously with values
1,2,3,4,5,6,7,8....
On the server
I created a simple ASP page that pauses 10 seconds then returns a
result.
The problem:
I would expect all the results to come back around 10 seconds however
this is not the case
It takes 10 seconds x the number of calls for the last call to come back
Each call comes back in the order that I called.
It seems as if LoadVars internally queues the requests and waits until
the request has come back until it fires off the next request.
Im contemplating writing a queuing system before each call to loadvars
but I thought the whole purpose of Loadvars was that it had the
capablitlity to asynchronously call a host... so I think maybe there is
something wrong with my syntax?
Any help you could provide would be greatly appreciated!!!
Thanks in advance
Ash
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