@Override
  public final Service startAsync() {
    delegate.startAsync();
    return this;
  }

  /** @since 15.0 */
  @CanIgnoreReturnValue
  @Override
  public final Service stopAsync() {
    delegate.stopAsync();
    return this;
  }

  /** @since 15.0 */
  @Override
  public final void awaitRunning() {
    delegate.awaitRunning();
  }

  /** @since 15.0 */
  @Override

import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * An object with an operational state, plus asynchronous {@link #startAsync()} and {@link
 * #stopAsync()} lifecycle methods to transition between states. Example services include
 * webservers, RPC servers and timers.
 *
 * <p>The normal lifecycle of a service is:
 *
 * <ul>
 *   <li>{@linkplain State#NEW NEW} -&gt;

   *
   * <p>This method should return promptly; prefer to do work on a different thread where it is
   * convenient. It is invoked exactly once on service shutdown, even when {@link #stopAsync} is
   * called multiple times.
   *
   * <p>If {@link #stopAsync} is called on a {@link State#STARTING} service, this method is not
   * invoked immediately. Instead, it will be deferred until after the service is {@link

  @Override
  public final Service startAsync() {
    delegate.startAsync();
    return this;
  }

  /** @since 15.0 */
  @CanIgnoreReturnValue
  @Override
  public final Service stopAsync() {
    delegate.stopAsync();
    return this;
  }

  /** @since 15.0 */
  @Override
  public final void awaitRunning() {
    delegate.awaitRunning();
  }

  /** @since 15.0 */
  @Override

    state.awaitHealthy(timeout, unit);
  }

  /**
   * Initiates service {@linkplain Service#stopAsync shutdown} if necessary on all the services
   * being managed.
   *
   * @return this
   */
  @CanIgnoreReturnValue
  public ServiceManager stopAsync() {
    for (Service service : services) {
      service.stopAsync();
    }
    return this;
  }

  /**

  @Override
  public final Service startAsync() {
    delegate.startAsync();
    return this;
  }

  /** @since 15.0 */
  @CanIgnoreReturnValue
  @Override
  public final Service stopAsync() {
    delegate.stopAsync();
    return this;
  }

  /** @since 15.0 */
  @Override
  public final void awaitRunning() {
    delegate.awaitRunning();
  }

  /** @since 15.0 */
  @Override