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