code: public ServiceFuture<RouteFilterRuleInner> beginUpdateAsync(String resourceGroupName, String routeFilterName, String ruleName, PatchRouteFilterRule routeFilterRuleParameters, final ServiceCallback<RouteFilterRuleInner> serviceCallback) {
          return ServiceFuture.fromResponse(beginUpdateWithServiceResponseAsync(resourceGroupName, routeFilterName, ruleName, routeFilterRuleParameters), serviceCallback);
      }
docs: Updates a route in the specified route filter.
  
  @param resourceGroupName The name of the resource group.
  @param routeFilterName The name of the route filter.
  @param ruleName The name of the route filter rule.
  @param routeFilterRuleParameters Parameters supplied to the update route filter rule operation.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object