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 #ifndef EVENT_FORMATTER_H 16 #define EVENT_FORMATTER_H 17 18 #include <functional> 19 #include <map> 20 #include "ftrace_namespace.h" 21 #include "trace_plugin_result.pb.h" 22 23 FTRACE_NS_BEGIN 24 using FormatEventFn = std::function<std::string(const FtraceEvent&)>; 25 using CheckEventFn = std::function<bool(const FtraceEvent&)>; 26 27 class EventFormatterRegisterar; 28 29 class EventFormatter { 30 public: 31 static EventFormatter& GetInstance(); 32 33 // std::string FormatResult(const TracePluginResult& result); 34 35 std::string FormatEvent(const FtraceEvent& ftraceEvent); 36 37 protected: 38 friend class EventFormatterRegisterar; 39 void RegisterEvent(const std::string& name, const CheckEventFn& check, const FormatEventFn& format); 40 void UnregisterEvent(const std::string& name); 41 42 private: 43 struct EventRegistry { 44 CheckEventFn checkEvent_; 45 FormatEventFn formatEvent_; 46 }; 47 std::map<std::string, EventRegistry> eventRegistries_; 48 }; 49 50 class EventFormatterRegisterar { 51 public: 52 EventFormatterRegisterar(const std::string& name, const CheckEventFn& check, const FormatEventFn& format); 53 ~EventFormatterRegisterar(); 54 55 private: 56 std::string name_; 57 }; 58 FTRACE_NS_END 59 60 #define REGISTER_FTRACE_EVENT_FORMATTER(event, check, format) \ 61 static EventFormatterRegisterar ftrace##event##FormatterRegister##__LINE__(#event, check, format); 62 63 #endif // EVENT_FORMATTER_H