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