Lassi\Lassi::getInstance PHP Method

    public static function getInstance()
    {
        if (!static::$instance instanceof Lassi) {
            static::$instance = new Lassi();
        }
        return static::$instance;
    }

 /**
  * Load framework app routes
  * @return void
  */
 private static function loadRoutes()
 {
     $routes = dirname(__FILE__) . '/routes.php';
     if (!file_exists($routes) || !is_readable($routes)) {
         throw new NotFoundException('Routes not found.');
     }
     // Get Slim instance
     $app = \Lassi\Lassi::getInstance()->getApp();
     require_once $routes;
 }