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Home » Eclipse Projects » Remote Application Platform (RAP) » Server-Push/ asyncExec / java.lang.OutOfMemoryError
Server-Push/ asyncExec / java.lang.OutOfMemoryError [message #111654] Mon, 10 November 2008 13:37 Go to next message
May is currently offline MayFriend
Messages: 10
Registered: July 2009
Junior Member
Hi,
I’m trying to accomplish a server-push for my application.
Referring to this http://www.devx.com/webdev/Article/36101/1954 (Another
Eclipse RAP Test Drive: An Online Newsticker)

The current application is working with Spring-RMI for server
communication and is already running.
My results while creating this peace of software for the server push are:

public void createPartControl(Composite parent){
…
UICallBack.activate("notifierId");
Thread notifierThread = new Thread(createRunnable());
notifierThread.setDaemon(true);
notifierThread.start();
}

private Runnable createRunnable() {
return new Runnable() {
public void run() {
boolean running = true;

Runnable r = new Runnable(){
public void run() {
//do something
}
};

while (running) {
t.getDisplay().asyncExec(r);
}
t.getDisplay().asyncExec(new Runnable() {
public void run() {
UICallBack.deactivate("notifierId");
}
});
}
};
}


Now, my question:
Is that generally the right way to accomplish a server-push?
and:
I am struggling with this exception:

Exception in thread "Thread-6" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.util.Arrays.copyOf(Unknown Source)
at java.util.ArrayList.ensureCapacity(Unknown Source)
at java.util.ArrayList.add(Unknown Source)
at
org.eclipse.rwt.internal.lifecycle.UICallBackManager.addAsyn c(UICallBackManager.java:114)
at org.eclipse.swt.widgets.Display$1.run(Display.java:614)
at
org.eclipse.rwt.internal.lifecycle.UICallBackServiceHandler. runNonUIThreadWithFakeContext(UICallBackServiceHandler.java: 423)
at
org.eclipse.rwt.lifecycle.UICallBack.runNonUIThreadWithFakeC ontext(UICallBack.java:44)
at org.eclipse.swt.widgets.Display.asyncExec(Display.java:612)
at rap.view.WorktimesView$6.run(WorktimesView.java:240)
at java.lang.Thread.run(Unknown Source)


Any ideas what’s going wrong or how to prevent this error?

Thanks,

Konstantin May
Re: Server-Push/ asyncExec / java.lang.OutOfMemoryError [message #112044 is a reply to message #111654] Tue, 11 November 2008 07:39 Go to previous messageGo to next message
Eclipse UserFriend
Originally posted by: rherrmann.innoopract.com

it is probably the endless loop (while(runnning)) that causes the
OutOfMemory. Each call to asyncExec in this loop adds the given
runnable to a list and thus consumes memory.

The recommended way to use background threads in RAP is via the Jobs
API. See org.eclipse.core.runtime.jobs.Job for a start.

HTH
RĂ¼diger

May wrote:
> Hi,
> I’m trying to accomplish a server-push for my application.
> Referring to this http://www.devx.com/webdev/Article/36101/1954 (Another
> Eclipse RAP Test Drive: An Online Newsticker)
> The current application is working with Spring-RMI for server
> communication and is already running.
> My results while creating this peace of software for the server push are:
>
> public void createPartControl(Composite parent){
> …
> UICallBack.activate("notifierId");
> Thread notifierThread = new Thread(createRunnable());
> notifierThread.setDaemon(true);
> notifierThread.start();
> }
> private Runnable createRunnable() {
> return new Runnable() {
> public void run() {
> boolean running = true;
> Runnable r = new Runnable(){
> public void run() {
> //do something
> }
> };
> while (running) {
> t.getDisplay().asyncExec(r);
> }
> t.getDisplay().asyncExec(new Runnable() {
> public void run() {
> UICallBack.deactivate("notifierId");
> }
> });
> }
> };
> }
>
>
> Now, my question: Is that generally the right way to accomplish a
> server-push?
> and:
> I am struggling with this exception:
>
> Exception in thread "Thread-6" java.lang.OutOfMemoryError: Java heap space
> at java.util.Arrays.copyOf(Unknown Source)
> at java.util.Arrays.copyOf(Unknown Source)
> at java.util.ArrayList.ensureCapacity(Unknown Source)
> at java.util.ArrayList.add(Unknown Source)
> at
> org.eclipse.rwt.internal.lifecycle.UICallBackManager.addAsyn c(UICallBackManager.java:114)
>
> at org.eclipse.swt.widgets.Display$1.run(Display.java:614)
> at
> org.eclipse.rwt.internal.lifecycle.UICallBackServiceHandler. runNonUIThreadWithFakeContext(UICallBackServiceHandler.java: 423)
>
> at
> org.eclipse.rwt.lifecycle.UICallBack.runNonUIThreadWithFakeC ontext(UICallBack.java:44)
>
> at org.eclipse.swt.widgets.Display.asyncExec(Display.java:612)
> at rap.view.WorktimesView$6.run(WorktimesView.java:240)
> at java.lang.Thread.run(Unknown Source)
>
>
> Any ideas what’s going wrong or how to prevent this error?
>
> Thanks,
> Konstantin May
>
>
>
Re: Server-Push/ asyncExec / java.lang.OutOfMemoryError [message #112049 is a reply to message #112044] Tue, 11 November 2008 09:33 Go to previous messageGo to next message
May is currently offline MayFriend
Messages: 10
Registered: July 2009
Junior Member
Thanks, that is much better to handel.

I have changed the code to this:

private Runnable createRunnable() {
return new Runnable() {
public void run() {
Job job = new Job("myJob") {
protected IStatus run(IProgressMonitor monitor) {
// fetch something from Server
t.getDisplay().asyncExec(new Runnable(){
public void run() {
//updated UI
}
});
return Status.OK_STATUS;
}
};
job.schedule();
boolean running = true;
while (running) {
job.schedule(1000);
}
}
};
}

I'm quite a little bit confused, but this doesent't realy look like a
server-push.I suppose that is more similar to server-polling-mechanism.

Is there a better way for getting events from the server?
This solution could produce a massive traffic between server an client.

Thanks in advance,

Konstantin May
Re: Server-Push/ asyncExec / java.lang.OutOfMemoryError [message #112101 is a reply to message #112049] Tue, 11 November 2008 12:00 Go to previous message
Eclipse UserFriend
Originally posted by: rherrmann.innoopract.com

Konstantin,

if you want to learn more about how the UI Callback mechanism works
internally, you may want to search the news archive (e.g. ui callback).
One thread related to this is:
http://dev.eclipse.org/newslists/news.eclipse.technology.rap /msg01751.html

HTH
RĂ¼diger

May wrote:
> Thanks, that is much better to handel.
>
> I have changed the code to this:
>
> private Runnable createRunnable() {
> return new Runnable() {
> public void run() {
> Job job = new Job("myJob") {
> protected IStatus run(IProgressMonitor monitor) {
> // fetch something from Server
> t.getDisplay().asyncExec(new Runnable(){
> public void run() {
> //updated UI
> }
> });
> return Status.OK_STATUS;
> }
> };
> job.schedule();
> boolean running = true;
> while (running) {
> job.schedule(1000);
> }
> }
> };
> }
>
> I'm quite a little bit confused, but this doesent't realy look like a
> server-push.I suppose that is more similar to server-polling-mechanism.
>
> Is there a better way for getting events from the server?
> This solution could produce a massive traffic between server an client.
>
> Thanks in advance,
>
> Konstantin May
>
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