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/*****************************************************************************
* Copyright (c) 2014 Christian W. Damus and others.
*
* All rights reserved. This program and the accompanying materials
* are 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:
* Christian W. Damus - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.junit.utils;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.FutureTask;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.RunnableFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import com.google.common.collect.ImmutableList;
/**
* A convenient {@link ExecutorService} implementation for test cases where we want to control
* when asynchronous tasks run.
*/
public class SynchronousExecutorService extends AbstractExecutorService {
/**
* A runnable to post to me to cause me to run all pending tasks. This lets the caller
* synchronize with me, to run and/or wait for all tasks up to that point.
*
* @see #flush()
*/
public static final Runnable FLUSH = new Runnable() {
public void run() {
// Pass
}
};
private final AtomicBoolean isShutdown = new AtomicBoolean();
private final ConcurrentLinkedQueue<Runnable> queue = new ConcurrentLinkedQueue<Runnable>();
private final Lock lock = new ReentrantLock();
private final Condition done = lock.newCondition();
/**
* Constructor.
*/
public SynchronousExecutorService() {
super();
}
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
lock.lockInterruptibly();
try {
long now = System.currentTimeMillis();
long deadline = now + unit.toMillis(timeout);
while (!isTerminated()) {
if (done.await(deadline - now, TimeUnit.MILLISECONDS)) {
break;
}
now = System.currentTimeMillis();
if (now >= deadline) {
break;
}
}
} finally {
lock.unlock();
}
return isTerminated();
}
public boolean isShutdown() {
return isShutdown.get();
}
public boolean isTerminated() {
return isShutdown() && queue.isEmpty();
}
public void shutdown() {
if (isShutdown.compareAndSet(false, true)) {
queue.clear();
}
}
public List<Runnable> shutdownNow() {
List<Runnable> result;
lock.lock();
try {
if (isShutdown.compareAndSet(false, true)) {
result = ImmutableList.copyOf(queue);
queue.clear();
done.signalAll();
} else {
result = Collections.emptyList();
}
} finally {
lock.unlock();
}
return result;
}
public void execute(Runnable command) {
final boolean flush = isFlush(command);
lock.lock();
try {
if (isShutdown()) {
throw new RejectedExecutionException("executor is shut down");
}
// Even if it's FLUSH, enqueue it because somebody may be synchronizing on a Future wrapping it
queue.add(command);
} finally {
lock.unlock();
}
if (flush) {
flush();
}
}
public void flush() {
lock.lock();
try {
for (Runnable next = queue.poll(); next != null; next = queue.poll()) {
lock.unlock();
try {
next.run();
} catch (Exception e) {
final String bsn = "org.eclipse.papyrus.junit.utils";
IStatus status = new Status(IStatus.ERROR, bsn, "Uncaught exception in async runnable.", e);
Platform.getLog(Platform.getBundle(bsn)).log(status);
} finally {
lock.lock();
}
}
if (isShutdown()) {
done.signalAll();
}
} finally {
lock.unlock();
}
}
@Override
protected <T> RunnableFuture<T> newTaskFor(Runnable task, T value) {
return new MyFutureTask<T>(task, value);
}
boolean isFlush(Runnable task) {
return (task == FLUSH) || ((task instanceof MyFutureTask<?>) && ((MyFutureTask<?>) task).task == FLUSH);
}
//
// Nested types
//
private static class MyFutureTask<V> extends FutureTask<V> {
final Runnable task;
MyFutureTask(Runnable task, V value) {
super(task, value);
this.task = task;
}
}
}
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