/**
  * Returns an singleton instance of this class
  *
  * @param object $config
  * @param object $args
  * @return
  */
 public static function getInstance($config, $args, $customer)
 {
     if (self::$instance == null) {
         self::$instance = new PcAutoConfiguratorManager($config, $args, $customer);
     }
     return self::$instance;
 }