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 UTILS_EVENT_HANDLER_H 17 #define UTILS_EVENT_HANDLER_H 18 19 #include "errors.h" 20 #include "io_event_common.h" 21 namespace OHOS { 22 namespace Utils { 23 24 class IOEventReactor; 25 26 class IOEventHandler { 27 public: 28 IOEventHandler(); 29 explicit IOEventHandler(int fd, EventId events = Events::EVENT_NONE, const EventCallback& cb = nullptr); 30 IOEventHandler& operator=(const IOEventHandler&) = delete; 31 IOEventHandler(const IOEventHandler&) = delete; 32 IOEventHandler& operator=(const IOEventHandler&&) = delete; 33 IOEventHandler(const IOEventHandler&&) = delete; 34 virtual ~IOEventHandler(); 35 36 bool Start(IOEventReactor* reactor); 37 bool Stop(IOEventReactor* reactor); 38 bool Update(IOEventReactor* reactor); 39 SetFd(int fd)40 inline void SetFd(int fd) 41 { 42 fd_ = fd; 43 } 44 SetEvents(EventId events)45 inline void SetEvents(EventId events) 46 { 47 events_ = events; 48 } 49 SetCallback(const EventCallback & cb)50 inline void SetCallback(const EventCallback& cb) 51 { 52 cb_ = cb; 53 } 54 GetFd()55 inline int GetFd() const 56 { 57 return fd_; 58 } 59 GetEvents()60 inline EventId GetEvents() const 61 { 62 return events_; 63 } 64 GetCallback()65 inline EventCallback GetCallback() const 66 { 67 return cb_; 68 } 69 Prev()70 inline IOEventHandler* Prev() const 71 { 72 return prev_; 73 } 74 Next()75 inline IOEventHandler* Next() const 76 { 77 return next_; 78 } 79 80 void EnableRead(); 81 void EnableWrite(); 82 void DisableWrite(); 83 void DisableAll(); 84 IsActive()85 inline bool IsActive() 86 { 87 return (prev_ != nullptr && enabled_); 88 } 89 private: 90 IOEventHandler* prev_; 91 IOEventHandler* next_; 92 93 int fd_; 94 EventId events_; 95 EventCallback cb_; 96 bool enabled_; 97 98 friend class IOEventReactor; 99 }; 100 101 } // namespace Utils 102 } // namespace OHOS 103 #endif /* UTILS_EVENT_HANDLER_H_ */ 104