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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.service.executor;
import java.util.logging.Level;
import java.time.Duration;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Logger;
/**
* @author hakonhall
*/
public class RunletExecutorImpl implements RunletExecutor {
private static Logger logger = Logger.getLogger(RunletExecutorImpl.class.getName());
private final AtomicInteger executionId = new AtomicInteger(0);
private final ConcurrentHashMap<Integer, CancellableImpl> cancellables = new ConcurrentHashMap<>();
private final ScheduledThreadPoolExecutor executor;
public RunletExecutorImpl(int threadPoolSize) {
executor = new ScheduledThreadPoolExecutor(threadPoolSize);
}
public Cancellable scheduleWithFixedDelay(Runlet runlet, Duration delay) {
Duration initialDelay = Duration.ofMillis((long) ThreadLocalRandom.current().nextInt((int) delay.toMillis()));
CancellableImpl cancellable = new CancellableImpl(runlet);
ScheduledFuture<?> future = executor.scheduleWithFixedDelay(cancellable, initialDelay.toMillis(), delay.toMillis(), TimeUnit.MILLISECONDS);
cancellable.setPeriodicExecutionCancellationCallback(() -> future.cancel(false));
Integer id = executionId.incrementAndGet();
cancellables.put(id, cancellable);
return () -> cancelRunlet(id);
}
private void cancelRunlet(Integer id) {
CancellableImpl cancellable = cancellables.remove(id);
if (cancellable != null) {
cancellable.cancel();
}
}
@Override
public void close() {
// At this point no-one should be scheduling new runlets, so this ought to clear the map.
cancellables.keySet().forEach(this::cancelRunlet);
if (cancellables.size() > 0) {
throw new IllegalStateException("Runlets scheduled while closing the executor");
}
// The cancellables will cancel themselves from the executor only after up-to delay time,
// so wait until all have drained.
while (executor.getQueue().size() > 0) {
try { Thread.sleep(200); } catch (InterruptedException ignored) { }
}
executor.shutdown();
try {
executor.awaitTermination(10, TimeUnit.MINUTES);
} catch (InterruptedException e) {
logger.log(Level.WARNING, "Timed out waiting for termination of executor", e);
}
}
}
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