1 /* 2 * Copyright (c) 2023-2024 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 DATASHARESERVICE_KV_DELEGATE_H 17 #define DATASHARESERVICE_KV_DELEGATE_H 18 19 #include <mutex> 20 #include <string> 21 22 #include "db_delegate.h" 23 #include "executor_pool.h" 24 #include "grd_base/grd_db_api.h" 25 26 namespace OHOS::DataShare { 27 class KvDelegate final : public KvDBDelegate { 28 public: 29 KvDelegate(const std::string &path, const std::shared_ptr<ExecutorPool> &executors); 30 ~KvDelegate() override; 31 std::pair<int32_t, int32_t> Upsert(const std::string &collectionName, const KvData &value) override; 32 std::pair<int32_t, int32_t> Delete(const std::string &collectionName, const std::string &filter) override; 33 int32_t Get(const std::string &collectionName, const Id &id, std::string &value) override; 34 35 int32_t Get(const std::string &collectionName, const std::string &filter, const std::string &projection, 36 std::string &result) override; 37 int32_t GetBatch(const std::string &collectionName, const std::string &filter, const std::string &projection, 38 std::vector<std::string> &result) override; 39 void NotifyBackup() override; 40 41 private: 42 bool Init(); 43 bool GetVersion(const std::string &collectionName, const std::string &filter, int &version); 44 std::pair<int32_t, int32_t> Upsert(const std::string &collectionName, const std::string &filter, 45 const std::string &value); 46 void Flush(); 47 bool RestoreIfNeed(int32_t dbStatus); 48 void Backup(); 49 void Restore(); 50 void RemoveDbFile(bool isBackUp) const; 51 bool CopyFile(bool isBackup); 52 std::recursive_mutex mutex_; 53 std::string path_; 54 GRD_DB *db_ = nullptr; 55 bool isInitDone_ = false; 56 std::shared_ptr<ExecutorPool> executors_ = nullptr; 57 ExecutorPool::TaskId taskId_ = ExecutorPool::INVALID_TASK_ID; 58 bool hasChange_ = false; 59 }; 60 } // namespace OHOS::DataShare 61 #endif // DATASHARESERVICE_KV_DELEGATE_H 62