/*******************************************************************************
* Copyright (c) 2011 Red Hat, Inc.
* Distributed under license by Red Hat, Inc. All rights reserved.
* This program is made available under the terms of the
* Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Red Hat, Inc. - initial API and implementation
******************************************************************************/
package org.jboss.tools.common.ui;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.jobs.IJobChangeEvent;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.core.runtime.jobs.JobChangeAdapter;
/**
* A Future that allows you to wait with a timeout for the result of a job.
*
* @author André Dietisheim
*/
public class JobResultFuture implements Future<IStatus> {
private AtomicBoolean done = new AtomicBoolean(false);
private AtomicBoolean cancelled = new AtomicBoolean(false);
private ArrayBlockingQueue<IStatus> queue = new ArrayBlockingQueue<IStatus>(1);
private Job job;
public JobResultFuture(Job job) {
this.job = job;
addJobFinishedListener(job);
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
if (!isRunning(job) || mayInterruptIfRunning) {
cancelled.set(true);
job.cancel();
Thread thread = job.getThread();
if(thread != null) {
thread.interrupt();
}
}
return isRunning(job);
}
private boolean isRunning(Job job) {
return job.getState() == Job.RUNNING;
}
@Override
public boolean isCancelled() {
return cancelled.get();
}
@Override
public boolean isDone() {
if (isCancelled()) {
return false;
}
return done.get();
}
@Override
public IStatus get() throws InterruptedException, ExecutionException {
return queue.poll();
}
@Override
public IStatus get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException,
TimeoutException {
return queue.poll(timeout, unit);
}
private void addJobFinishedListener(final Job job) {
job.addJobChangeListener(new JobChangeAdapter() {
@Override
public void done(IJobChangeEvent event) {
queue.offer(event.getResult());
done.set(true);
}
});
}
}