1 /*
2  * Copyright (C) 2020 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 <android-base/macros.h>
20 #include <android/hardware/automotive/audiocontrol/2.0/ICloseHandle.h>
21 
22 namespace android::hardware::automotive::audiocontrol::V2_0::implementation {
23 
24 /** Generic ICloseHandle implementation ignoring double-close events. */
25 class CloseHandle : public ICloseHandle {
26   public:
27     using Callback = std::function<void()>;
28 
29     /**
30      * Create a handle with a callback.
31      *
32      * The callback is guaranteed to be called exactly once.
33      *
34      * \param callback Called on the first close() call, or on destruction of the handle
35      */
36     CloseHandle(Callback callback = nullptr);
37     virtual ~CloseHandle();
38 
39     Return<void> close() override;
40 
41   private:
42     const Callback mCallback;
43     std::atomic<bool> mIsClosed = false;
44 
45     DISALLOW_COPY_AND_ASSIGN(CloseHandle);
46 };
47 
48 }  // namespace android::hardware::automotive::audiocontrol::V2_0::implementation
49