@Singleton
  @Named(MUTATING_CONTROLLER)
  public AdmissionController<Ingress> mutatingController() {
    return new AdmissionController<>((resource, operation) -> {
      if (resource.getMetadata().getLabels() == null) {
        resource.getMetadata().setLabels(new HashMap<>());
      }
      resource.getMetadata().getLabels().putIfAbsent(APP_NAME_LABEL_KEY, "mutation-test");
      return resource;
    });
  }
  
  @Singleton
  @Named(VALIDATING_CONTROLLER)
  public AdmissionController<Ingress> validatingController() {
    return new AdmissionController<>((resource, oldResource, operation) -> {
      if (resource.getMetadata().getLabels() == null
              || resource.getMetadata().getLabels().get(APP_NAME_LABEL_KEY) == null) {
        throw new NotAllowedException("Missing label: " + APP_NAME_LABEL_KEY);
      }
    });
  }

  @POST
  @Path(MUTATE_PATH)
  @Consumes(MediaType.APPLICATION_JSON)
  @Produces(MediaType.APPLICATION_JSON)
  public AdmissionReview mutate(AdmissionReview admissionReview) {
    return mutationController.handle(admissionReview);
  }
  @POST
  @Path(VALIDATE_PATH)
  @Consumes(MediaType.APPLICATION_JSON)
  @Produces(MediaType.APPLICATION_JSON)
  public AdmissionReview validate(AdmissionReview admissionReview) {
    return validationController.handle(admissionReview);
  }

  @Singleton
  public ConversionController conversionController() {
    var controller = new ConversionController();
    controller.registerMapper(new V1Mapper());
    controller.registerMapper(new V2Mapper());
    return controller;
  }

  @PostMapping(CONVERSION_PATH)
  @ResponseBody
  public ConversionReview convert(@RequestBody ConversionReview conversionReview) {
    return conversionController.handle(conversionReview);
  }