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/*-------------------------------------------------------------------------+
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| Copyright (c) 2009-2018 CQSE GmbH |
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+-------------------------------------------------------------------------*/
package com.teamscale.jacoco.agent.util;
import java.time.Duration;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* Triggers a callback in a regular interval. Note that the spawned threads are
* Daemon threads, i.e. they will not prevent the JVM from shutting down.
*
* The timer will abort if the given {@link #runnable} ever throws an exception.
*/
public class Timer {
/** Runs the job on a background daemon thread. */
private final ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(1, runnable -> {
Thread thread = Executors.defaultThreadFactory().newThread(runnable);
thread.setDaemon(true);
return thread;
});
/** The currently running job or null. */
private ScheduledFuture job = null;
/** The job to execute periodically. */
private final Runnable runnable;
/** Duration between two job executions. */
private final Duration duration;
/** Constructor. */
public Timer(Runnable runnable, Duration duration) {
this.runnable = runnable;
this.duration = duration;
}
/** Starts the regular job. */
public synchronized void start() {
if (job != null) {
return;
}
job = executor.scheduleAtFixedRate(runnable, duration.toMinutes(), duration.toMinutes(), TimeUnit.MINUTES);
}
/** Stops the regular job, possibly aborting it. */
public synchronized void stop() {
job.cancel(false);
job = null;
}
}