Hi,
I'm having some difficulties when making multiple GWT RPC calls from
within a GWT Timer.
I've run my example in a few different applications that monitor the
memory usage of the page and in all of them there is a constant
increase in the amount of memory after each call.
In the example all I am doing is scheduling a Timer to run every 5
seconds to call my service that simply returns a large string - around
250,000 characters (JSON formatted).
The memory increase seems to occur in IE7, IE8, FireFox Chrome.
Chrome's developer tools (Heap Snapshots profile) seems to suggest
that the increase is related to the strings I'm returning - I'm
assuming that by nulling the string that once the method finishes
running the garbage collector should clean it up but something must be
holding onto them, I just cant work out what!!
Any help would be greatly appreciated! Let me know if anyone requires
any extra information!
My entry point consists of the following code.
package com.imass.performancetesting.client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.imass.performancetesting.client.services.IVesselServices;
import
com.imass.performancetesting.client.services.IVesselServicesAsync;
public class PerformanceTestingEntryPoint implements EntryPoint {
/**
* Create a remote service proxy to talk to the server-side Vessel
service (Async).
*/
private IVesselServicesAsync rpcVesselServices =
GWT.create(IVesselServices.class);
public void onModuleLoad() {
new Timer() {
public void run() {
rpcVesselServices.getCurrentVessels(new
AsyncCallbackString() {
@Override
public void onFailure(Throwable arg0) {
// Show the RPC error message
to the user
GWT.log(arg0.getMessage());
}
@Override
public void onSuccess(String
resultString) {
resultString = null;
}
});
}
}.scheduleRepeating(5 * 1000);
}
}
Thanks in advance,
Jason.
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