code: public RouteFilterInner beginCreateOrUpdate(String resourceGroupName, String routeFilterName, RouteFilterInner routeFilterParameters) {
          return beginCreateOrUpdateWithServiceResponseAsync(resourceGroupName, routeFilterName, routeFilterParameters).toBlocking().single().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
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the RouteFilterInner object if successful.