private function load($serviceId, $serviceKey)
    {
        $service = $this->getConfig()->get($serviceId);
        if ($service === false) {
            $service = $this->tryAutowiring($serviceId, $serviceKey);
        }
        if (is_object($service) && ($service instanceof ServiceLocatorAwareInterface)) {
            $service->setServiceLocator($this);
        }
        return $service;
    }