/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.runtime.iterative.concurrent;
import org.junit.Assert;
import org.junit.Test;
public class SuperstepKickoffLatchTest {
@Test
public void testWaitFromOne() {
try {
SuperstepKickoffLatch latch = new SuperstepKickoffLatch();
Waiter w = new Waiter(latch, 2);
Thread waiter = new Thread(w);
waiter.setDaemon(true);
waiter.start();
WatchDog wd = new WatchDog(waiter, 2000);
wd.start();
Thread.sleep(100);
latch.triggerNextSuperstep();
wd.join();
if (wd.getError() != null) {
throw wd.getError();
}
if (w.getError() != null) {
throw w.getError();
}
}
catch (Throwable t) {
t.printStackTrace();
Assert.fail("Error: " + t.getMessage());
}
}
@Test
public void testWaitAlreadyFulfilled() {
try {
SuperstepKickoffLatch latch = new SuperstepKickoffLatch();
latch.triggerNextSuperstep();
Waiter w = new Waiter(latch, 2);
Thread waiter = new Thread(w);
waiter.setDaemon(true);
waiter.start();
WatchDog wd = new WatchDog(waiter, 2000);
wd.start();
Thread.sleep(100);
wd.join();
if (wd.getError() != null) {
throw wd.getError();
}
if (w.getError() != null) {
throw w.getError();
}
}
catch (Throwable t) {
t.printStackTrace();
Assert.fail("Error: " + t.getMessage());
}
}
@Test
public void testWaitIncorrect() {
try {
SuperstepKickoffLatch latch = new SuperstepKickoffLatch();
latch.triggerNextSuperstep();
latch.triggerNextSuperstep();
try {
latch.awaitStartOfSuperstepOrTermination(2);
Assert.fail("should throw exception");
}
catch (IllegalStateException e) {
// good
}
}
catch (Exception e) {
e.printStackTrace();
Assert.fail("Error: " + e.getMessage());
}
}
@Test
public void testWaitIncorrectAsync() {
try {
SuperstepKickoffLatch latch = new SuperstepKickoffLatch();
latch.triggerNextSuperstep();
latch.triggerNextSuperstep();
Waiter w = new Waiter(latch, 2);
Thread waiter = new Thread(w);
waiter.setDaemon(true);
waiter.start();
WatchDog wd = new WatchDog(waiter, 2000);
wd.start();
Thread.sleep(100);
wd.join();
if (wd.getError() != null) {
throw wd.getError();
}
if (w.getError() != null) {
if (!(w.getError() instanceof IllegalStateException)) {
throw new Exception("wrong exception type " + w.getError());
}
} else {
Assert.fail("should cause exception");
}
}
catch (Throwable t) {
t.printStackTrace();
Assert.fail("Error: " + t.getMessage());
}
}
@Test
public void testWaitForTermination() {
try {
SuperstepKickoffLatch latch = new SuperstepKickoffLatch();
latch.triggerNextSuperstep();
latch.triggerNextSuperstep();
Waiter w = new Waiter(latch, 4);
Thread waiter = new Thread(w);
waiter.setDaemon(true);
waiter.start();
WatchDog wd = new WatchDog(waiter, 2000);
wd.start();
latch.signalTermination();
wd.join();
if (wd.getError() != null) {
throw wd.getError();
}
if (w.getError() != null) {
throw w.getError();
}
}
catch (Throwable t) {
t.printStackTrace();
Assert.fail("Error: " + t.getMessage());
}
}
private static class Waiter implements Runnable {
private final SuperstepKickoffLatch latch;
private final int waitFor;
private volatile Throwable error;
public Waiter(SuperstepKickoffLatch latch, int waitFor) {
this.latch = latch;
this.waitFor = waitFor;
}
@Override
public void run() {
try {
latch.awaitStartOfSuperstepOrTermination(waitFor);
}
catch (Throwable t) {
this.error = t;
}
}
public Throwable getError() {
return error;
}
}
private static class WatchDog extends Thread {
private final Thread toWatch;
private final long timeOut;
private volatile Throwable failed;
public WatchDog(Thread toWatch, long timeout) {
setDaemon(true);
setName("Watchdog");
this.toWatch = toWatch;
this.timeOut = timeout;
}
@SuppressWarnings("deprecation")
@Override
public void run() {
try {
toWatch.join(timeOut);
if (toWatch.isAlive()) {
this.failed = new Exception("timed out");
toWatch.interrupt();
toWatch.join(2000);
if (toWatch.isAlive()) {
toWatch.stop();
}
}
}
catch (Throwable t) {
failed = t;
}
}
public Throwable getError() {
return failed;
}
}
}