gistfile1.txt

@Override
  public C get(final long timeout, final TimeUnit unit) throws InterruptedException, TimeoutException, ExecutionException {
    try {
      return super.get(timeout, unit);
    } catch (TimeoutException e) {
      Function<List<Optional<V>>, C> localCombiner = combiner;
      if (localCombiner != null) {
        // if the set took or not we don't care, if it doesn't take it means that it was set by the last future.
        set(localCombiner.apply(values));
      } else {
        // if combiner is null, then we should be done and have data.
        checkState(isDone());
      }
      // ether the state is messed up and an exception is thrown, or set was called which means data is present
      // this shouldn't block.
      return super.get();
    }
  }