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_DEMULTIPLEXER_H
17 #define UTILS_EVENT_DEMULTIPLEXER_H
18 
19 #include <mutex>
20 #include <memory>
21 #include <cstdint>
22 #include <map>
23 
24 namespace OHOS {
25 namespace Utils {
26 
27 class EventHandler;
28 
29 class EventDemultiplexer {
30 public:
31     EventDemultiplexer();
32     EventDemultiplexer(const EventDemultiplexer&) = delete;
33     EventDemultiplexer& operator=(const EventDemultiplexer&) = delete;
34     virtual ~EventDemultiplexer();
35 
36     uint32_t StartUp();
37     void CleanUp();
38 
39     void Polling(int timeout);
40 
41     uint32_t UpdateEventHandler(EventHandler* handler);
42 
43 private:
44     uint32_t Update(int operation, EventHandler* handler);
45     static uint32_t Reactor2Epoll(uint32_t reactorEvent);
46     static uint32_t Epoll2Reactor(uint32_t epollEvents);
47 
48     int epollFd_;
49     int maxEvents_;
50     std::recursive_mutex mutex_;
51     std::map<int, std::shared_ptr<EventHandler>> eventHandlers_; // guard by mutex_
52 };
53 
54 }
55 }
56 #endif /* UTILS_EVENT_DEMULTIPLEXER_H_ */
57