code: public Observable<RouteInner> beginCreateOrUpdateAsync(String resourceGroupName, String routeTableName, String routeName, RouteInner routeParameters) {
          return beginCreateOrUpdateWithServiceResponseAsync(resourceGroupName, routeTableName, routeName, routeParameters).map(new Func1<ServiceResponse<RouteInner>, RouteInner>() {
              @Override
              public RouteInner call(ServiceResponse<RouteInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates or updates a route in the specified route table.
  
  @param resourceGroupName The name of the resource group.
  @param routeTableName The name of the route table.
  @param routeName The name of the route.
  @param routeParameters Parameters supplied to the create or update route operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the RouteInner object