import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import javax.annotation.CheckForNull;

/**
 * Base class for implementing services that can handle {@link #doStart} and {@link #doStop}
 * requests, responding to them with {@link #notifyStarted()} and {@link #notifyStopped()}
 * callbacks. Its subclasses must manage threads manually; consider {@link

  private final Service delegate = new DelegateService();

  @WeakOuter
  private final class DelegateService extends AbstractService {
    @Override
    protected final void doStart() {
      MoreExecutors.renamingDecorator(executor(), threadNameSupplier)
          .execute(
              () -> {
                try {
                  startUp();
                  notifyStarted();

        } finally {
          lock.unlock();
        }
      }
    }

    private final Runnable task = new Task();

    @Override
    protected final void doStart() {
      executorService =
          MoreExecutors.renamingDecorator(executor(), () -> serviceName() + " " + state());
      executorService.execute(
          () -> {
            lock.lock();
            try {

  /* use AbstractService for state management */
  private final Service delegate =
      new AbstractService() {
        @Override
        protected final void doStart() {
          Executor executor = MoreExecutors.renamingDecorator(executor(), () -> serviceName());
          executor.execute(
              () -> {
                try {
                  startUp();

   * logging statements.
   */
  private static final class NoOpService extends AbstractService {
    @Override
    protected void doStart() {
      notifyStarted();
    }

    @Override
    protected void doStop() {
      notifyStopped();
    }
  }

  /** This is never thrown but only used for logging. */

   * logging statements.
   */
  private static final class NoOpService extends AbstractService {
    @Override
    protected void doStart() {
      notifyStarted();
    }

    @Override
    protected void doStop() {
      notifyStopped();
    }
  }

  /** This is never thrown but only used for logging. */