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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.concurrent;
import java.time.Duration;
import java.util.Objects;
import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Execute a runnable exactly once in a background thread.
*
* @author mpolden
*/
public class Once extends TimerTask {
private static final Logger log = Logger.getLogger(Once.class.getName());
private final Runnable runnable;
private final Timer timer = new Timer(true);
// private to avoid exposing run method
private Once(Runnable runnable, Duration delay) {
this.runnable = Objects.requireNonNull(runnable, "runnable must be non-null");
Objects.requireNonNull(delay, "delay must be non-null");
timer.schedule(this, delay.toMillis());
}
/** Execute runnable after given delay */
public static void after(Duration delay, Runnable runnable) {
new Once(runnable, delay);
}
@Override
public void run() {
try {
runnable.run();
} catch (Throwable t) {
log.log(Level.WARNING, "Task '" + runnable + "' failed", t);
} finally {
timer.cancel();
}
}
}
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