public final ParallelFlux<T> doOnRequest(LongConsumer onRequest){
  Objects.requireNonNull(onRequest,"onRequest");
  return doOnSignal(this,null,null,null,null,null,null,onRequest,null);
}

public final ParallelFlux < T > doOnRequest ( LongConsumer onRequest ) { Objects . requireNonNull ( onRequest , "onRequest" ) ; return doOnSignal ( this , null , null , null , null , null , null , onRequest , null ) ; }
call the specified consumer with the request amount if any rail receives a request .
