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/*
* 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.
*/
package jsr166;
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 {
// android-note: Removed because the CTS runner does a bad job of
// retrying tests that have suite() declarations.
//
// public static void main(String[] args) {
// main(suite(), args);
// }
// public static Test suite() {
// return new TestSuite(...);
// }
/**
* 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);
}
}
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