code: public final Mono<T> repeatWhenEmpty(Function<Flux<Long>, ? extends Publisher<?>> repeatFactory) {
  		return repeatWhenEmpty(Integer.MAX_VALUE, repeatFactory);
  	}
docs: Repeatedly subscribe to this {@link Mono} as long as the current subscription to this
  {@link Mono} completes empty and the companion {@link Publisher} produces an onNext signal.
  <p>
  Any terminal signal will terminate the resulting {@link Mono} with the same signal immediately.
  
  <p>
  <img class="marble" src="doc-files/marbles/repeatWhenEmpty.svg" alt="">
  
  @param repeatFactory the {@link Function} that returns the associated {@link Publisher}
  companion, given a {@link Flux} that signals each onComplete as a 0-based incrementing {@link Long}.
  
  @return a {@link Mono} that resubscribes to this {@link Mono} if the previous subscription was empty,
  as long as the companion {@link Publisher} produces an onNext signal