1 /* 2 * Copyright (c) 2025 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 VIRTUAL_SQLITE_STORAGE_ENGINE_H 17 #define VIRTUAL_SQLITE_STORAGE_ENGINE_H 18 19 #include "sqlite_single_ver_storage_engine.h" 20 21 namespace DistributedDB { 22 class VirtualSingleVerStorageEngine : public SQLiteSingleVerStorageEngine { 23 public: 24 using NewExecutorMethod = std::function<int(bool isWrite, StorageExecutor *&)>; 25 using OpenMainDatabaseMethod = std::function<int(bool isWrite, sqlite3 *&, OpenDbProperties &)>; 26 void ForkNewExecutorMethod(const NewExecutorMethod &method); 27 void ForkOpenMainDatabaseMethod(const OpenMainDatabaseMethod &method); 28 void SetMaxNum(int maxRead, int maxWrite); 29 void SetEnhance(bool isEnhance); 30 void CallSetSQL(const std::vector<std::string> &sql); 31 std::pair<int, sqlite3 *> GetCacheHandle(OpenDbProperties &option); 32 protected: 33 int CreateNewExecutor(bool isWrite, DistributedDB::StorageExecutor *&handle) override; 34 int TryToOpenMainDatabase(bool isWrite, sqlite3 *&db, OpenDbProperties &option) override; 35 private: 36 std::mutex functionMutex_; 37 NewExecutorMethod forkNewFunc_; 38 OpenMainDatabaseMethod forkOpenMainFunc_; 39 }; 40 } 41 #endif // VIRTUAL_SQLITE_STORAGE_ENGINE_H 42