/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* Written by Doug Lea with assistance from members of JCP JSR-166
* Expert Group and released to the public domain, as explained at
* http://creativecommons.org/publicdomain/zero/1.0/
* Other contributors include Andrew Wright, Jeffrey Hayes,
* Pat Fisher, Mike Judd.
*/
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Exchanger;
import java.util.concurrent.TimeoutException;
import junit.framework.Test;
import junit.framework.TestSuite;
public class ExchangerTest extends JSR166TestCase {
public static void main(String[] args) {
main(suite(), args);
}
public static Test suite() {
return new TestSuite(ExchangerTest.class);
}
/**
* exchange exchanges objects across two threads
*/
public void testExchange() {
final Exchanger e = new Exchanger();
Thread t1 = newStartedThread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
assertSame(one, e.exchange(two));
assertSame(two, e.exchange(one));
}});
Thread t2 = newStartedThread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
assertSame(two, e.exchange(one));
assertSame(one, e.exchange(two));
}});
awaitTermination(t1);
awaitTermination(t2);
}
/**
* timed exchange exchanges objects across two threads
*/
public void testTimedExchange() {
final Exchanger e = new Exchanger();
Thread t1 = newStartedThread(new CheckedRunnable() {
public void realRun() throws Exception {
assertSame(one, e.exchange(two, LONG_DELAY_MS, MILLISECONDS));
assertSame(two, e.exchange(one, LONG_DELAY_MS, MILLISECONDS));
}});
Thread t2 = newStartedThread(new CheckedRunnable() {
public void realRun() throws Exception {
assertSame(two, e.exchange(one, LONG_DELAY_MS, MILLISECONDS));
assertSame(one, e.exchange(two, LONG_DELAY_MS, MILLISECONDS));
}});
awaitTermination(t1);
awaitTermination(t2);
}
/**
* interrupt during wait for exchange throws IE
*/
public void testExchange_InterruptedException() {
final Exchanger e = new Exchanger();
final CountDownLatch threadStarted = new CountDownLatch(1);
Thread t = newStartedThread(new CheckedInterruptedRunnable() {
public void realRun() throws InterruptedException {
threadStarted.countDown();
e.exchange(one);
}});
await(threadStarted);
t.interrupt();
awaitTermination(t);
}
/**
* interrupt during wait for timed exchange throws IE
*/
public void testTimedExchange_InterruptedException() {
final Exchanger e = new Exchanger();
final CountDownLatch threadStarted = new CountDownLatch(1);
Thread t = newStartedThread(new CheckedInterruptedRunnable() {
public void realRun() throws Exception {
threadStarted.countDown();
e.exchange(null, LONG_DELAY_MS, MILLISECONDS);
}});
await(threadStarted);
t.interrupt();
awaitTermination(t);
}
/**
* timeout during wait for timed exchange throws TimeoutException
*/
public void testExchange_TimeoutException() {
final Exchanger e = new Exchanger();
Thread t = newStartedThread(new CheckedRunnable() {
public void realRun() throws Exception {
long startTime = System.nanoTime();
try {
e.exchange(null, timeoutMillis(), MILLISECONDS);
shouldThrow();
} catch (TimeoutException success) {}
assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
}});
awaitTermination(t);
}
/**
* If one exchanging thread is interrupted, another succeeds.
*/
public void testReplacementAfterExchange() {
final Exchanger e = new Exchanger();
final CountDownLatch exchanged = new CountDownLatch(2);
final CountDownLatch interrupted = new CountDownLatch(1);
Thread t1 = newStartedThread(new CheckedInterruptedRunnable() {
public void realRun() throws InterruptedException {
assertSame(two, e.exchange(one));
exchanged.countDown();
e.exchange(two);
}});
Thread t2 = newStartedThread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
assertSame(one, e.exchange(two));
exchanged.countDown();
interrupted.await();
assertSame(three, e.exchange(one));
}});
Thread t3 = newStartedThread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
interrupted.await();
assertSame(one, e.exchange(three));
}});
await(exchanged);
t1.interrupt();
awaitTermination(t1);
interrupted.countDown();
awaitTermination(t2);
awaitTermination(t3);
}
}