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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.concurrent;
import java.util.concurrent.TimeUnit;
/**
* This is an implementation of {@link Timer} that is backed by an actual system timer.
*
* @author Simon Thoresen Hult
*/
public enum SystemTimer implements Timer {
INSTANCE;
private volatile long millis;
private SystemTimer() {
millis = TimeUnit.NANOSECONDS.toMillis(System.nanoTime());
Thread thread = new Thread() {
@Override
public void run() {
while (true) {
millis = TimeUnit.NANOSECONDS.toMillis(System.nanoTime());
try {
Thread.sleep(1);
} catch (InterruptedException e) {
break;
}
}
}
};
thread.setDaemon(true);
thread.start();
}
@Override
public long milliTime() {
return millis;
}
}
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