protected function askForServiceContainerId($service = null)
    {
        if (!isset($service)) {
            $service = $this->askForServiceName();
        }
        $container_id = $this->getServiceContainerId($service);

        if ($container_id === false) {
            throw new EngineRuntimeException(
                sprintf('Unable to obtain the container identifier for the %s service.', $service)
            );
        }

        return $container_id;
    }