code: public Observable<RouteFilterInner> createOrUpdateAsync(String resourceGroupName, String routeFilterName, RouteFilterInner routeFilterParameters) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, routeFilterName, routeFilterParameters).map(new Func1<ServiceResponse<RouteFilterInner>, RouteFilterInner>() {
              @Override
              public RouteFilterInner call(ServiceResponse<RouteFilterInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates or updates a route filter in a specified resource group.
  
  @param resourceGroupName The name of the resource group.
  @param routeFilterName The name of the route filter.
  @param routeFilterParameters Parameters supplied to the create or update route filter operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request