private static function getInstance()
    {
        if (self::$_instance == null) {
            self::$_instance = new Fabricate();
            self::$_instance->config = new FabricateConfig();
            self::$_instance->registry = new FabricateRegistry('Fabricate', null);
            self::$_instance->traits = [];
        }
        return self::$_instance;
    }