code: public static <T, C> RingBufferBuilder<T, C> withSingleProducer( Executor executor,
                                                                       ConsumerAdapter<T, C> adapter ) {
          return new RingBufferBuilder<>(executor, adapter).singleProducer();
      }
docs: Create a builder for ring buffers that use the supplied {@link Executor} to create consumer threads and the supplied
  {@link ConsumerAdapter} to adapt to custom consumer implementations. The ring buffer will <i>only</i> allow entries to be
  added from a single thread.
  
  @param executor the executor that should be used to create threads to run {@link Consumer}s; may not be null
  @param adapter the adapter to the desired consumer interface; may not be null
  @return the builder for ring buffers; never null