OnGiftCountChanged onGiftCountChanged = (String roomId, 
                                         int totalGiftsSent,
                                         int totalGiftCoins, 
                                         int totalUniqueGiftSenders) {};

OnReceiveGiftMessage onReceiveGiftMessage = (String roomId, 
                                             TUIGiftInfo giftInfo, 
                                             int count, 
                                             TUIUserInfo sender) {};

OnReceiveLikesMessage onReceiveLikesMessage = (String roomId, 
                                               int totalLikesReceived, 
                                               TUIUserInfo sender) {};

void addObserver(TUILiveGiftObserver observer);

void removeObserver(TUILiveGiftObserver observer);

Future<TUIValueCallBack<List<TUIGiftCategory>>> getGiftList(String roomId);

Future<TUIActionCallback> sendGift(String roomId,
                                   String giftId, 
                                   int count);

Future<TUIActionCallback> sendLike(String roomId, 
                                   int count);

Future<TUIValueCallBack<TUIGiftCountRequestResult>> getGiftCountByAnchor(String roomId);

Future<TUIValueCallBack<int>> getLikesCount(String roomId);