/**
   * Creates a {@code ListenableFutureTask} that will upon running, execute the given {@code
   * Callable}.
   *
   * @param callable the callable task
   * @since 10.0
   */
  public static <V extends @Nullable Object> ListenableFutureTask<V> create(Callable<V> callable) {
    return new ListenableFutureTask<>(callable);
  }

  /**

  private final CountDownLatch listenerLatch = new CountDownLatch(1);

  private volatile boolean throwException = false;

  private final ListenableFutureTask<Integer> task =
      ListenableFutureTask.create(
          () -> {
            runLatch.countDown();
            taskLatch.await();
            if (throwException) {
              throw new IllegalStateException("Fail");

  private final CountDownLatch listenerLatch = new CountDownLatch(1);

  private volatile boolean throwException = false;

  private final ListenableFutureTask<Integer> task =
      ListenableFutureTask.create(
          () -> {
            runLatch.countDown();
            taskLatch.await();
            if (throwException) {
              throw new IllegalStateException("Fail");

      public V load(K key) throws Exception {
        return loader.load(key);
      }

      @Override
      public ListenableFuture<V> reload(K key, V oldValue) {
        ListenableFutureTask<V> task =
            ListenableFutureTask.create(() -> loader.reload(key, oldValue).get());
        executor.execute(task);
        return task;
      }

      @Override

      public V load(K key) throws Exception {
        return loader.load(key);
      }

      @Override
      public ListenableFuture<V> reload(K key, V oldValue) {
        ListenableFutureTask<V> task =
            ListenableFutureTask.create(() -> loader.reload(key, oldValue).get());
        executor.execute(task);
        return task;
      }

      @Override

    return new SequentialExecutor(delegate);
  }

  /**
   * Creates an {@link ExecutorService} whose {@code submit} and {@code invokeAll} methods submit
   * {@link ListenableFutureTask} instances to the given delegate executor. Those methods, as well
   * as {@code execute} and {@code invokeAny}, are implemented in terms of calls to {@code