private volatile boolean shutdown;

    @Override
    public void shutdown() {
      shutdown = true;
    }

    @Override
    public List<Runnable> shutdownNow() {
      shutdown();
      return ImmutableList.of();
    }

    @Override
    public boolean isShutdown() {
      return shutdown;
    }

    @Override
    public boolean isTerminated() {

    }

    public void test_shutdown_withListener() {
        // Add shutdown listener
        TestShutdownListener listener = new TestShutdownListener();
        scriptExecutor.addShutdownListener(listener);

        // Verify listener not called yet
        assertFalse(listener.wasShutdownCalled());

        // Call shutdown
        scriptExecutor.shutdown();

        // Verify listener was called

    task: Task,
    delayNanos: Long = 0L,
  ) {
    taskRunner.withLock {
      if (shutdown) {
        if (task.cancelable) {
          taskRunner.logger.taskLog(task, this) { "schedule canceled (queue is shutdown)" }
          return
        }
        taskRunner.logger.taskLog(task, this) { "schedule failed (queue is shutdown)" }
        throw RejectedExecutionException()
      }

   * message buffer (16 MiB) will be rejected and trigger a [graceful shutdown][close] of this web
   * socket. This method returns false in that case, and in any other case where this web socket is
   * closing, closed, or canceled.
   *
   * This method returns immediately.
   */
  fun send(bytes: ByteString): Boolean

  /**
   * Attempts to initiate a graceful shutdown of this web socket. Any already-enqueued messages will

 * the "running" state need to perform a periodic task. Subclasses can implement {@link #startUp},
 * {@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

 * the "running" state need to perform a periodic task. Subclasses can implement {@link #startUp},
 * {@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

            return t;
        };
        cleanupExecutor = Executors.newSingleThreadScheduledExecutor(threadFactory);

        // Add shutdown hook for cleanup
        Runtime.getRuntime().addShutdownHook(new Thread(this::shutdown, "ResourceManager-Shutdown"));

        startCleanupTask();
    }

    /**
     * Get the singleton instance
     *
     * @return ResourceManager instance
     */

                  // which case we should skip right down to shutdown.
                  if (isRunning()) {
                    try {
                      AbstractExecutionThreadService.this.run();
                    } catch (Throwable t) {
                      restoreInterruptIfIsInterruptedException(t);
                      try {
                        shutDown();
                      } catch (Exception ignored) {

  @Test
  fun shutdownWithoutStart() {
    val server = MockWebServer()
    server.shutdown()
  }

  @Test
  fun closeViaClosable() {
    val server: Closeable = MockWebServer()
    server.close()
  }

  @Test
  fun shutdownWithoutEnqueue() {
    val server = MockWebServer()
    server.start()
    server.shutdown()
  }

  @Test
  fun portImplicitlyStarts() {

                  // which case we should skip right down to shutdown.
                  if (isRunning()) {
                    try {
                      AbstractExecutionThreadService.this.run();
                    } catch (Throwable t) {
                      restoreInterruptIfIsInterruptedException(t);
                      try {
                        shutDown();
                      } catch (Exception ignored) {