throw new IllegalStateException("build operation notification valve already started");
            }

            state = new State();
            buildOperationListenerManager.addListener(state.buildOperationListener);
        }


        @Override
        public void stop() {
            if (state != null) {
                state.stop();
                state = null;
            }

      // Register a listener on each Future in the list to update the state of this future.
      // Note that if all the futures on the list are done prior to completing this loop, the last
      // call to addListener() will callback to setOneValue(), transitively call our cleanup
      // listener, and set this.futures to null.
      // This is not actually a problem, since the foreach only needs this.futures to be non-null

		ctx := wait.ContextForChannel(hookContext.StopCh)

		// prime values and start listeners
		if s.ClusterAuthenticationInfo.ClientCA != nil {
			s.ClusterAuthenticationInfo.ClientCA.AddListener(controller)
			if controller, ok := s.ClusterAuthenticationInfo.ClientCA.(dynamiccertificates.ControllerRunner); ok {
				// runonce to be sure that we have a value.
				if err := controller.RunOnce(ctx); err != nil {

      AsyncFunction<? super I, ? extends O> function,
      Executor executor) {
    checkNotNull(executor);
    AsyncTransformFuture<I, O> output = new AsyncTransformFuture<>(input, function);
    input.addListener(output, rejectionPropagatingExecutor(executor, output));
    return output;
  }

  static <I extends @Nullable Object, O extends @Nullable Object> ListenableFuture<O> create(

   * service changes state. The listener will not have previous state changes replayed, so it is
   * suggested that listeners are added before the service starts.
   *
   * <p>{@code addListener} guarantees execution ordering across calls to a given listener but not
   * across calls to multiple listeners. Specifically, a given listener will have its callbacks

   * service changes state. The listener will not have previous state changes replayed, so it is
   * suggested that listeners are added before the service starts.
   *
   * <p>{@code addListener} guarantees execution ordering across calls to a given listener but not
   * across calls to multiple listeners. Specifically, a given listener will have its callbacks

     * <li>{@link org.gradle.api.tasks.testing.TestOutputListener}
     * </ul>
     *
     * @param listener The listener to add. Does nothing if this listener has already been added.
     */
    void addListener(Object listener);

    /**
     * Removes the given listener from this build.
     *
     * @param listener The listener to remove. Does nothing if this listener has not been added.
     */

    // taskFuture guarantees completion if the callable is invoked, and adding to outputFuture
    // propagates cancellation if the callable has not yet been invoked.
    outputFuture.addListener(listener, directExecutor());
    taskFuture.addListener(listener, directExecutor());

    return outputFuture;
  }

  enum RunningState {
    NOT_RUN,
    CANCELLED,
    STARTED,
  }

  /**

    // taskFuture guarantees completion if the callable is invoked, and adding to outputFuture
    // propagates cancellation if the callable has not yet been invoked.
    outputFuture.addListener(listener, directExecutor());
    taskFuture.addListener(listener, directExecutor());

    return outputFuture;
  }

  enum RunningState {
    NOT_RUN,
    CANCELLED,
    STARTED,
  }

  /**

  }

  @Override
  public final State state() {
    return delegate.state();
  }

  /** @since 13.0 */
  @Override
  public final void addListener(Listener listener, Executor executor) {
    delegate.addListener(listener, executor);
  }

  /** @since 14.0 */
  @Override
  public final Throwable failureCause() {
    return delegate.failureCause();
  }

  /** @since 15.0 */