1 /* 2 * Copyright (c) 2023 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 IMF_SYSTEM_PARAM_ADAPTER_H 17 #define IMF_SYSTEM_PARAM_ADAPTER_H 18 19 #include <string> 20 namespace OHOS { 21 namespace MiscServices { 22 class SystemParamAdapter { 23 public: 24 static constexpr const char *SYSTEM_LANGUAGE_KEY = "persist.global.language"; 25 static constexpr const char *MEMORY_WATERMARK_KEY = "resourceschedule.memmgr.min.memmory.watermark"; 26 static SystemParamAdapter &GetInstance(); 27 int32_t WatchParam(const std::string &key); 28 bool GetBoolParam(const std::string &key); 29 30 private: 31 SystemParamAdapter() = default; 32 using CbHandler = void (*)(const char *key, const char *value, void *context); 33 static const std::unordered_map<std::string, CbHandler> PARAM_CB_HANDLERS; 34 static void OnLanguageChange(const char *key, const char *value, void *context); 35 static void OnMemoryChange(const char *key, const char *value, void *context); 36 static void HandleSysParamChanged(const char *key, const char *value, const char *expectedKey, int32_t messageId); 37 }; 38 } // namespace MiscServices 39 } // namespace OHOS 40 41 #endif // IMF_SYSTEM_PARAM_ADAPTER_H 42