/**
* @throws RejectedExecutionException {@inheritDoc}
* @throws NullPointerException {@inheritDoc}
* @throws IllegalArgumentException {@inheritDoc}
*/
public ScheduledFuture<?> scheduleWithFixedDelay(
Runnable command, long initialDelay, long delay, TimeUnit unit) {
if (command == null || unit == null) throw new NullPointerException();
if (delay <= 0) throw new IllegalArgumentException();
ScheduledFutureTask<Void> sft =
new ScheduledFutureTask<Void>(
command, null, triggerTime(initialDelay, unit), unit.toNanos(-delay));
RunnableScheduledFuture<Void> t = decorateTask(command, sft);
sft.outerTask = t;
delayedExecute(t);
return t;
}
