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
AsyncCallback<String>() {
@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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