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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 
16 #ifndef UTILS_EVENT_HANDLER_H
17 #define UTILS_EVENT_HANDLER_H
18 
19 #include <cstdint>
20 #include <map>
21 #include <functional>
22 
23 namespace OHOS {
24 namespace Utils {
25 
26 class EventReactor;
27 
28 class EventHandler {
29 public:
30     using Callback = std::function<void()>;
31 
32     EventHandler(int fd, EventReactor* r);
33     EventHandler& operator=(const EventHandler&) = delete;
34     EventHandler(const EventHandler&) = delete;
35     EventHandler& operator=(const EventHandler&&) = delete;
36     EventHandler(const EventHandler&&) = delete;
~EventHandler()37     ~EventHandler() {}
38 
GetHandle()39     int GetHandle() const { return (fd_); }
Events()40     uint32_t Events() const { return (events_); }
41 
42     void EnableRead();
43     void EnableWrite();
44     void DisableWrite();
45     void DisableAll();
46 
GetEventReactor()47     const EventReactor* GetEventReactor() const { return reactor_; }
48 
SetCloseCallback(const Callback & closeCallback)49     void SetCloseCallback(const Callback& closeCallback) { closeCallback_ = closeCallback; }
SetErrorCallback(const Callback & errorCallback)50     void SetErrorCallback(const Callback& errorCallback) { errorCallback_ = errorCallback; }
SetReadCallback(const Callback & readCallback)51     void SetReadCallback(const Callback& readCallback) { readCallback_ = readCallback; }
SetWriteCallback(const Callback & writeCallback)52     void SetWriteCallback(const Callback& writeCallback) { writeCallback_ = writeCallback; }
53 
54     void HandleEvents(uint32_t events);
55 
56 private:
57     void Update();
58 
59 private:
60     int             fd_;
61     uint32_t        events_;
62     EventReactor*   reactor_;
63 
64     Callback  readCallback_;
65     Callback  writeCallback_;
66     Callback  closeCallback_;
67     Callback  errorCallback_;
68 };
69 
70 }
71 }
72 #endif /* UTILS_EVENT_HANDLER_H_ */
73