1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include "info.h"
20 
21 #include <memory>
22 #include <mutex>
23 
24 // A class that keeps track of the current state of the WiFi HAL. This is
25 // accomplished by having the HAL call this state tracker which in turn will
26 // call the appropriate functionality.
27 //
28 // This is needed because the HAL must have some form of global state to prevent
29 // situations where the HAL is initialized while stopping. This class allows
30 // the Info class to stay relatively simple and this class can focus on just the
31 // state behavior.
32 class HalState {
33 public:
34     using StopHandler = std::function<void ()>;
35 
36     HalState();
37 
38     bool init();
39     bool stop(StopHandler stopHandler);
40     bool eventLoop();
41 
42     Info* info();
43 
44 private:
45     enum class State {
46         Constructed,
47         Initialized,
48         Running,
49         Stopping,
50         Stopped,
51     };
52 
53     void onStop(StopHandler stopHandler);
54 
55     std::unique_ptr<Info> mInfo;
56     std::mutex mStateMutex;
57     State mState;
58 };
59 
60