findAuthors.java

public Mono<WSAuthorResponse> findAuthors(Integer offset, Integer limit) {
		WSAuthorResponse result = new WSAuthorResponse();
		return authorRepository.count()
		                       .map(totalElements -> {
			                       result.setTotalElements(totalElements);
			                       return totalElements;
		                       })
		                       .flatMapMany(el -> authorRepository.retrieveAllAuthors(PageRequest.of(offset, limit)))
		                       .collectList()
		                       .map(data -> {
			                       result.setAuthors(data);
			                       return result;
		                       });
	}