/*
* 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 static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.util.Random;
import org.apache.flink.runtime.event.TaskEvent;
import org.apache.flink.runtime.iterative.event.AllWorkersDoneEvent;
import org.apache.flink.runtime.iterative.event.TerminationEvent;
import org.junit.Test;
public class SuperstepBarrierTest {
@Test
public void syncAllWorkersDone() throws InterruptedException {
for (int n = 0; n < 20; n++) {
sync(new AllWorkersDoneEvent());
}
}
@Test
public void syncTermination() throws InterruptedException {
for (int n = 0; n < 20; n++) {
sync(new TerminationEvent());
}
}
private void sync(TaskEvent event) throws InterruptedException {
TerminationSignaled terminationSignaled = new TerminationSignaled();
SuperstepBarrier barrier = new SuperstepBarrier(getClass().getClassLoader());
barrier.setup();
Thread headThread = new Thread(new IterationHead(barrier, terminationSignaled));
Thread syncThread = new Thread(new IterationSync(barrier, event));
headThread.start();
syncThread.start();
headThread.join();
syncThread.join();
if (event instanceof TerminationEvent) {
assertTrue(terminationSignaled.isTerminationSignaled());
} else {
assertFalse(terminationSignaled.isTerminationSignaled());
}
}
class IterationHead implements Runnable {
private final SuperstepBarrier barrier;
private final TerminationSignaled terminationSignaled;
private final Random random;
IterationHead(SuperstepBarrier barrier, TerminationSignaled terminationSignaled) {
this.barrier = barrier;
this.terminationSignaled = terminationSignaled;
random = new Random();
}
@Override
public void run() {
try {
Thread.sleep(random.nextInt(10));
barrier.waitForOtherWorkers();
if (barrier.terminationSignaled()) {
terminationSignaled.setTerminationSignaled();
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
class IterationSync implements Runnable {
private final SuperstepBarrier barrier;
private final TaskEvent event;
private final Random random;
IterationSync(SuperstepBarrier barrier, TaskEvent event) {
this.barrier = barrier;
this.event = event;
random = new Random();
}
@Override
public void run() {
try {
Thread.sleep(random.nextInt(10));
barrier.onEvent(event);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
class TerminationSignaled {
private volatile boolean terminationSignaled;
public boolean isTerminationSignaled() {
return terminationSignaled;
}
public void setTerminationSignaled() {
terminationSignaled = true;
}
}
}