code: @SuppressWarnings("unchecked")
    public static Route.Mapper<Object> reactor(final Function<Flux, Flux> flux,
      final Function<Mono, Mono> mono) {
      requireNonNull(flux, "Flux's adapter is required.");
      requireNonNull(mono, "Mono's adapter is required.");
      return Route.Mapper.create("reactor", value -> {
        if (value instanceof Flux) {
          return new Deferred(deferred -> flux.apply((Flux) value)
            .consume(deferred::set, deferred::set));
        }
        if (value instanceof Mono) {
          return new Deferred(deferred -> mono.apply((Mono) value)
            .consume(deferred::set, deferred::set));
        }
        return value;
      });
    }
docs: Map a reactor object like {@link Flux} or {@link Mono} into a {@link Deferred} object.
  
  <pre>{@code
  ...
  import org.jooby.reactor.Reactor;
  ...
  
  {
  with(() -> {
  get("/lux", req -> Flux...);
  
  get("/mono", req -> Mono...);
  
  }).map(Reactor.reactor(
  flux -> flux.publishOn(Computations.concurrent()),
  mono -> mono.publishOn(Computations.concurrent()));
  }
  }</pre>
  
  @param flux A flux adapter.
  @param mono A mono adapter.
  @return A new mapper.