}

    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.future)
          .toList();
    }