code: public static <V> FluentFuture<V> from(ListenableFuture<V> future) {
      if (future instanceof FluentFuture<?>) {
        return (FluentFuture<V>) future;
      }
      return new WrapingFluentFuture<>(future, MoreExecutors.directExecutor());
    }
docs: Wraps listenable future with a fluent future.
  @param <V> value type
  @param future future
  @return fluent instance