1 /* 2 * Copyright (c) 2022-2023 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 #ifndef MSG_HANDLER_H 16 #define MSG_HANDLER_H 17 18 #include <functional> 19 #include <map> 20 #include <string> 21 22 #include "proto.h" 23 24 namespace OHOS { 25 namespace Msdp { 26 namespace DeviceStatus { 27 template<typename K, typename V> 28 class MsgHandler { 29 public: 30 struct MsgCallback { 31 K id; 32 V fun; 33 }; 34 35 public: Clear()36 void Clear() 37 { 38 callbacks_.clear(); 39 } ChkKey(K id)40 bool ChkKey(K id) 41 { 42 return (GetMsgCallback(id) != nullptr); 43 } 44 GetDebugInfo()45 const std::string& GetDebugInfo() const 46 { 47 std::string str; 48 for (auto &it : callbacks_) { 49 str += std::to_string(it.first); 50 str += ','; 51 } 52 if (!str.empty()) { 53 str.resize(str.size() - 1); 54 } 55 56 return std::move(str); 57 } 58 RegisterEvent(MsgCallback & msg)59 bool RegisterEvent(MsgCallback& msg) 60 { 61 auto it = callbacks_.find(msg.id); 62 if (it != callbacks_.end()) { 63 return false; 64 } 65 callbacks_[msg.id] = msg.fun; 66 return true; 67 } 68 69 protected: 70 virtual ~MsgHandler() = default; GetMsgCallback(K id)71 V *GetMsgCallback(K id) 72 { 73 auto it = callbacks_.find(id); 74 if (it == callbacks_.end()) { 75 return nullptr; 76 } 77 return &it->second; 78 } 79 80 protected: 81 std::map<K, V> callbacks_; 82 }; 83 } // namespace DeviceStatus 84 } // namespace Msdp 85 } // namespace OHOS 86 #endif // MSG_HANDLER_H 87