code: public Observable<ControllerInner> beginCreateAsync(String resourceGroupName, String name, ControllerInner controller) {
          return beginCreateWithServiceResponseAsync(resourceGroupName, name, controller).map(new Func1<ServiceResponse<ControllerInner>, ControllerInner>() {
              @Override
              public ControllerInner call(ServiceResponse<ControllerInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates an Azure Dev Spaces Controller.
  Creates an Azure Dev Spaces Controller with the specified create parameters.
  
  @param resourceGroupName Resource group to which the resource belongs.
  @param name Name of the resource.
  @param controller Controller create parameters.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ControllerInner object