* {@link #shutDown} and also a {@link #runOneIteration} method that will be executed periodically.
 *
 * <p>This class uses the {@link ScheduledExecutorService} returned from {@link #executor} to run
 * the {@link #startUp} and {@link #shutDown} methods and also uses that service to schedule the
 * {@link #runOneIteration} that will be executed periodically as specified by its {@link

    service.stopAsync().awaitTerminated();
    assertTrue(future.isCancelled());
  }

  private class NullService extends AbstractScheduledService {
    @Override
    protected void runOneIteration() throws Exception {}

    @Override
    protected Scheduler scheduler() {
      return configuration;
    }

    @Override
    protected ScheduledExecutorService executor() {
      return executor;

    service.stopAsync().awaitTerminated();
    assertTrue(future.isCancelled());
  }

  private class NullService extends AbstractScheduledService {
    @Override
    protected void runOneIteration() throws Exception {}

    @Override
    protected Scheduler scheduler() {
      return configuration;
    }

    @Override
    protected ScheduledExecutorService executor() {
      return executor;