1 /*
2  * Copyright (c) 2021-2021 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 HISTREAMER_FOUNDATION_OSAL_TASK_H
17 #define HISTREAMER_FOUNDATION_OSAL_TASK_H
18 
19 #include <atomic>
20 #include <functional>
21 #include <string>
22 
23 #include "foundation/osal/thread/condition_variable.h"
24 #include "foundation/osal/thread/mutex.h"
25 #include "foundation/osal/thread/thread.h"
26 
27 namespace OHOS {
28 namespace Media {
29 namespace OSAL {
30 class Task {
31 public:
32     explicit Task(std::string name, ThreadPriority priority = ThreadPriority::HIGH);
33 
34     explicit Task(std::string name, std::function<void()> handler, ThreadPriority priority = ThreadPriority::HIGH);
35 
36     virtual ~Task();
37 
38     virtual void Start();
39 
40     virtual void Stop();
41 
42     virtual void StopAsync();
43 
44     virtual void Pause();
45 
46     virtual void PauseAsync();
47 
48     virtual void DoTask();
49 
50     void RegisterHandler(std::function<void()> handler);
51 
52 private:
53     enum class RunningState {
54         STARTED,
55         PAUSING,
56         PAUSED,
57         STOPPING,
58         STOPPED,
59     };
60 
61     void Run();
62 
63     const std::string name_;
64     const ThreadPriority priority_;
65     std::atomic<RunningState> runningState_{RunningState::PAUSED};
66     std::function<void()> handler_ = [this] { DoTask(); };
67     std::unique_ptr<OSAL::Thread> loop_;
68     OSAL::Mutex stateMutex_{};
69     OSAL::ConditionVariable syncCond_{};
70 };
71 } // namespace OSAL
72 } // namespace Media
73 } // namespace OHOS
74 #endif // HISTREAMER_FOUNDATION_OSAL_TASK_H
75