org.apache.flink.runtime.iterative.concurrent.SuperstepBarrier Maven / Gradle / Ivy
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* 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,
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*/
package org.apache.flink.runtime.iterative.concurrent;
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.apache.flink.runtime.util.event.EventListener;
import org.apache.flink.types.Value;
import java.util.concurrent.CountDownLatch;
/** A resettable one-shot latch. */
public class SuperstepBarrier implements EventListener {
private final ClassLoader userCodeClassLoader;
private boolean terminationSignaled = false;
private CountDownLatch latch;
private String[] aggregatorNames;
private Value[] aggregates;
public SuperstepBarrier(ClassLoader userCodeClassLoader) {
this.userCodeClassLoader = userCodeClassLoader;
}
/** Setup the barrier, has to be called at the beginning of each superstep. */
public void setup() {
latch = new CountDownLatch(1);
}
/** Wait on the barrier. */
public void waitForOtherWorkers() throws InterruptedException {
latch.await();
}
public String[] getAggregatorNames() {
return aggregatorNames;
}
public Value[] getAggregates() {
return aggregates;
}
/** Barrier will release the waiting thread if an event occurs. */
@Override
public void onEvent(TaskEvent event) {
if (event instanceof TerminationEvent) {
terminationSignaled = true;
} else if (event instanceof AllWorkersDoneEvent) {
AllWorkersDoneEvent wde = (AllWorkersDoneEvent) event;
aggregatorNames = wde.getAggregatorNames();
aggregates = wde.getAggregates(userCodeClassLoader);
} else {
throw new IllegalArgumentException("Unknown event type.");
}
latch.countDown();
}
public boolean terminationSignaled() {
return terminationSignaled;
}
}