public static function getInstance()
 {
     if ($pReload || is_null(self::$_Instance)) {
         // process
         self::$_Instance = new self();
     }
     return self::$_Instance;
 }
 /**
  *
  * @return array
  */
 public function resource_types()
 {
     $params = array('resource_class' => $this->identity(), 'active' => 1);
     return Game_Model_Gameresourcetypes::getInstance()->find($params);
 }