code: public static <REACTOR extends ReactBuilder> ReactPool<REACTOR> boundedPool(final Collection<REACTOR> reactors) {
          final ReactPool<REACTOR> r = new ReactPool<>(
                                                       reactors.size());
          reactors.forEach(r::populate);
          return r;
      }
docs: If all REACTORs are in use calling react will block.
  
  @param reactors Create a bounded pool of the specified REACTORs
  @return ReactPool