# parse subscribe

<code dart>
itemSubscribe() async {
  /// 1. 등록, 2. 수정, 3. 삭제
  itemDao.subscribe(pantry?.objectId, (LiveQueryEvent type, Item item) {
    switch (type) {
      case LiveQueryEvent.create:
      case LiveQueryEvent.enter:
        itemList.add(item);
        break;
      case LiveQueryEvent.update:
        var idx = itemList.indexWhere((e) => e.objectId == item.objectId);
        itemList[idx] = item;
        break;
      case LiveQueryEvent.leave:
      case LiveQueryEvent.delete:
        itemList =
            itemList.where((e) => e.objectId != item.objectId).toList();
        break;
      default:
    }

    itemClassify();
  });
}
</code>


<code>
subscribe(
  String? pantryId,
  Function(LiveQueryEvent, Item) callback,
) async {
  if (_liveQuery == null) _liveQuery = LiveQuery();
  unsubscribe();

  var query = QueryBuilder<Item>(Item())
    ..whereEqualTo(Item.keyPantryId, pantryId);

  _subscription = await _liveQuery?.client.subscribe(query);
  subscribeOn(_subscription, callback);
}
</code>


<code>
subscribeOn(Subscription? subscription, Function callback) {
  if (subscription == null) return;

  subscription.on(LiveQueryEvent.create, (value) {
    print('*** CREATE ***: ${DateTime.now().toString()}\n $value ');
    callback(LiveQueryEvent.create, value);
  });

  subscription.on(LiveQueryEvent.enter, (value) {
    print('*** ENTER ***: ${DateTime.now().toString()}\n $value ');
    callback(LiveQueryEvent.enter, value);
  });

  subscription.on(LiveQueryEvent.update, (value) {
    print('*** UPDATE ***: ${DateTime.now().toString()}\n $value ');
    callback(LiveQueryEvent.update, value);
  });

  subscription.on(LiveQueryEvent.leave, (value) {
    print('*** LEAVE ***: ${DateTime.now().toString()}\n $value ');
    callback(LiveQueryEvent.leave, value);
  });

  subscription.on(LiveQueryEvent.delete, (value) {
    print('*** DELETE ***: ${DateTime.now().toString()}\n $value ');
    callback(LiveQueryEvent.delete, value);
  });
}
</code>