@Override
  protected ListenableFuture<String> buildChainingFuture(ListenableFuture<Integer> inputFuture) {
    outputFuture = SettableFuture.create();
    funcIsWaitingLatch = new CountDownLatch(1);
    funcCompletionLatch = new CountDownLatch(1);
    return transformAsync(inputFuture, new ChainingFunction(), directExecutor());
  }

  @Override
  protected String getSuccessfulResult() {

  @Override
  protected ListenableFuture<String> buildChainingFuture(ListenableFuture<Integer> inputFuture) {
    outputFuture = SettableFuture.create();
    funcIsWaitingLatch = new CountDownLatch(1);
    funcCompletionLatch = new CountDownLatch(1);
    return transformAsync(inputFuture, new ChainingFunction(), directExecutor());
  }

  @Override
  protected String getSuccessfulResult() {

    private final @Nullable ListenableFuture<? extends T>[] inputFutures;
    private volatile int delegateIndex = 0;

    private InCompletionOrderState(ListenableFuture<? extends T>[] inputFutures) {
      this.inputFutures = inputFutures;
      incompleteOutputCount = new AtomicInteger(inputFutures.length);
    }

    private void recordOutputCancellation(boolean interruptIfRunning) {

    AsyncFunction<String, Integer> function =
        unused -> {
          throw error;
        };
    SettableFuture<String> inputFuture = SettableFuture.create();
    ListenableFuture<Integer> outputFuture =
        transformAsync(inputFuture, function, directExecutor());
    inputFuture.set("value");
    ExecutionException expected =
        assertThrows(ExecutionException.class, () -> getDone(outputFuture));

    AsyncFunction<String, Integer> function =
        unused -> {
          throw error;
        };
    SettableFuture<String> inputFuture = SettableFuture.create();
    ListenableFuture<Integer> outputFuture =
        transformAsync(inputFuture, function, directExecutor());
    inputFuture.set("value");
    ExecutionException expected =
        assertThrows(ExecutionException.class, () -> getDone(outputFuture));

    }

    private FutureCombiner<@Nullable Object> futureCombiner() {
      return allMustSucceed
          ? Futures.whenAllSucceed(inputFutures())
          : Futures.whenAllComplete(inputFutures());
    }

    private ImmutableList<FluentFuture<?>> inputFutures() {
      return FluentIterable.from(inputs)
          .<FluentFuture<?>>transform(future -> future.state.future)
          .toList();
    }