1 /*
2  * Copyright (c) 2024 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 IMAGE_CODEC_MSGQUEUETHREAD_H
17 #define IMAGE_CODEC_MSGQUEUETHREAD_H
18 
19 #include <thread>
20 #include <mutex>
21 #include <condition_variable>
22 #include <functional>
23 #include <map>
24 #include <list>
25 #include "param_bundle.h"
26 
27 namespace OHOS::ImagePlugin {
28 using MsgType = int32_t;
29 using MsgId = uint64_t;
30 struct MsgInfo {
31     MsgType type;
32     MsgId id;
33     ParamSP param;
34 };
35 
36 class MsgHandleLoop {
37 protected:
38     MsgHandleLoop();
39     ~MsgHandleLoop();
40     void SendAsyncMsg(MsgType type, const ParamSP &msg, uint32_t delayUs = 0);
41     bool SendSyncMsg(MsgType type, const ParamSP &msg, ParamSP &reply, uint32_t waitMs = 0);
42     virtual void OnMsgReceived(const MsgInfo &info) = 0;
43     void PostReply(MsgId id, const ParamSP &reply);
44     void Stop();
45     static constexpr MsgId ASYNC_MSG_ID = 0;
46 
47 private:
48     void MainLoop();
49     MsgId GenerateMsgId();
50     using TimeUs = int64_t;
51     static TimeUs GetNowUs();
52 
53 private:
54     std::thread m_thread;
55     std::mutex m_mtx;
56     bool m_threadNeedStop = false;
57     MsgId m_lastMsgId = 0;
58     std::map<TimeUs, MsgInfo> m_msgQueue;  // msg will be sorted by timeUs
59     std::condition_variable m_threadCond;
60 
61     std::mutex m_replyMtx;
62     std::map<MsgId, ParamSP> m_replies;
63     std::condition_variable m_replyCond;
64 };
65 } // namespace OHOS::ImagePlugin
66 #endif // IMAGE_CODEC_MSGQUEUETHREAD_H
67