public static function getInstance()
    {
        $class = get_called_class();

        if (!isset(self::$instances[$class])) {
            $container = StaticContainer::getContainer();

            $refl = new \ReflectionClass($class);

            if (!$refl->getConstructor() || $refl->getConstructor()->isPublic()) {
                self::$instances[$class] = $container->get($class);
            } else {
                /** @var LoggerInterface $logger */
                $logger = $container->get('Psr\Log\LoggerInterface');

                // BC with API defining a protected constructor
                $logger->notice('The API class {class} defines a protected constructor which is deprecated, make the constructor public instead', array('class' => $class));
                self::$instances[$class] = new $class;
            }
        }

        return self::$instances[$class];
    }