1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef KVSTORE_OBSERVER_H 17 #define KVSTORE_OBSERVER_H 18 19 #include <memory> 20 #include "change_notification.h" 21 22 namespace OHOS { 23 namespace DistributedKv { 24 // client implement this class to watch kvstore change. 25 class API_EXPORT KvStoreObserver { 26 public: 27 /** 28 * @brief Constructor. 29 */ 30 API_EXPORT KvStoreObserver() = default; 31 32 /** 33 * @brief Destructor. 34 */ ~KvStoreObserver()35 API_EXPORT virtual ~KvStoreObserver() {} 36 37 /** 38 * @brief Would called when kvstore data change. 39 * 40 * client should override this function to receive change notification. 41 */ OnChange(const ChangeNotification & changeNotification)42 API_EXPORT virtual void OnChange(const ChangeNotification &changeNotification) {} 43 }; 44 } // namespace DistributedKv 45 } // namespace OHOS 46 #endif // KVSTORE_OBSERVER_H 47