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Replies:
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Last Post:
Apr 25, 2007 5:30 PM
by: Hans Muller
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JSR296 - Scheduled background tasks ?
Posted:
Apr 25, 2007 4:11 PM
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Hi.
I'm not sure I should post this here, but I have a question regarding the JSR296 API.
I currently do not think it is possible use the current API to schedule periodic background tasks (kinda like Timer / TimerTask does). I sincerely think it would be important to have that in JSR296.
Maybe it does not fit the concept of JSR296, but I'd like to hear your thoughts and/or suggestions on how to do it. I really wish I could use the same facilities in TaskMonitor to handle message passing etc... from my background tasks that are run periodically.
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Re: JSR296 - Scheduled background tasks ?
Posted:
Apr 25, 2007 5:30 PM
in response to: fproulx
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jdnc-interest@javadesktop.org wrote:
> Hi.
>
> I'm not sure I should post this here, but I have a question regarding the JSR296 API.
>
> I currently do not think it is possible use the current API to schedule periodic background tasks (kinda like Timer / TimerTask does). I sincerely think it would be important to have that in JSR296.
>
> Maybe it does not fit the concept of JSR296, but I'd like to hear your thoughts and/or suggestions on how to do it. I really wish I could use the same facilities in TaskMonitor to handle message passing etc... from my background tasks that are run periodically.
> [Message sent by forum member 'fproulx' (fproulx)]
>
> http://forums.java.net/jive/thread.jspa?messageID=214359
>
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> To unsubscribe, e-mail: jdnc-unsubscribe@jdnc.dev.java.net
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>
It's easy enough to create a Task that does some work periodically. The
example below does some work on the EDT periodically.
Creating a more elaborate API that allows one to schedule Tasks to run
at absolute/relative times as well as supporting Tasks that are created
and run periodically, is certainly possible. It's not part of the plan
for the first Application Framework release.
- Hans
----------
import application.ApplicationContext;
import application.SingleFrameApplication;
import application.Task;
import java.util.List;
import java.util.concurrent.TimeUnit;
import javax.swing.JLabel;
/**
* Demonstrates creating a Task that runs periodically. The
* Tasks's {@code process} method runs on the EDT,
* every period milliseconds.
*
* @author Hans Muller (Hans.Muller@Sun.COM)
*/
public class PeriodicTaskExample extends SingleFrameApplication {
JLabel label = null;
class MyPeriodicTask extends Task<Void, Void> {
private final long period;
MyPeriodicTask(long period) {
this.period = period;
}
public Void doInBackground() throws InterruptedException {
while(!isCancelled()) {
Thread.sleep(period);
publish((Void)null);
}
return (Void)null;
}
public void process(List<Void> ignored) {
long dt = getExecutionDuration(TimeUnit.MILLISECONDS);
label.setText("Elapsed time: " + dt);
}
}
@Override protected void startup() {
label = new JLabel("Ready...");
show(label);
}
@Override protected void ready() {
ApplicationContext ac = ApplicationContext.getInstance();
ac.getTaskService().execute(new MyPeriodicTask(500L));
}
public static void main(String[] args) {
launch(PeriodicTaskExample.class, args);
}
}
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