public function __construct($volumeId, $snapshotCountLimit, $interval, $description)
 {
     parent::__construct($volumeId, $snapshotCountLimit, $interval, $description);
 }
 public function __construct($volumeId, $snapshotCountLimit, $description)
 {
     parent::__construct($volumeId, $snapshotCountLimit, '0 minute', $description);
 }