OLD | NEW |
1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CONTENT_RENDERER_MEDIA_SCOPED_LOOP_OBSERVER_H_ | 5 #ifndef CONTENT_RENDERER_MEDIA_SCOPED_LOOP_OBSERVER_H_ |
6 #define CONTENT_RENDERER_MEDIA_SCOPED_LOOP_OBSERVER_H_ | 6 #define CONTENT_RENDERER_MEDIA_SCOPED_LOOP_OBSERVER_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include "base/memory/ref_counted.h" | 9 #include "base/memory/ref_counted.h" |
10 #include "base/message_loop.h" | 10 #include "base/message_loop.h" |
11 #include "base/message_loop_proxy.h" | 11 #include "base/message_loop_proxy.h" |
12 | 12 |
13 namespace base { | 13 namespace base { |
14 class WaitableEvent; | 14 class WaitableEvent; |
15 } | 15 } |
16 | 16 |
17 // A common base class for AudioDevice and AudioInputDevice that manages | 17 // A common base class for AudioDevice and AudioInputDevice that manages |
18 // a message loop pointer and monitors it for destruction. If the object goes | 18 // a message loop pointer and monitors it for destruction. If the object goes |
19 // out of scope before the message loop, the object will automatically remove | 19 // out of scope before the message loop, the object will automatically remove |
20 // itself from the message loop's list of destruction observers. | 20 // itself from the message loop's list of destruction observers. |
21 // NOTE: The class that inherits from this class must implement the | 21 // NOTE: The class that inherits from this class must implement the |
22 // WillDestroyCurrentMessageLoop virtual method from DestructionObserver. | 22 // WillDestroyCurrentMessageLoop virtual method from DestructionObserver. |
23 class ScopedLoopObserver | 23 class ScopedLoopObserver |
24 : public MessageLoop::DestructionObserver { | 24 : public MessageLoop::DestructionObserver { |
25 public: | 25 public: |
26 explicit ScopedLoopObserver(MessageLoop* message_loop); | 26 explicit ScopedLoopObserver(MessageLoop* message_loop); |
| 27 |
| 28 protected: |
27 virtual ~ScopedLoopObserver(); | 29 virtual ~ScopedLoopObserver(); |
28 | 30 |
29 protected: | |
30 // Accessor to the loop that's used by the derived class. | 31 // Accessor to the loop that's used by the derived class. |
31 base::MessageLoopProxy* message_loop() { return loop_; } | 32 base::MessageLoopProxy* message_loop() { return loop_; } |
32 | 33 |
33 private: | 34 private: |
34 // Call to add or remove ourselves from the list of destruction observers for | 35 // Call to add or remove ourselves from the list of destruction observers for |
35 // the message loop. | 36 // the message loop. |
36 void ObserveLoopDestruction(bool enable, base::WaitableEvent* done); | 37 void ObserveLoopDestruction(bool enable, base::WaitableEvent* done); |
37 | 38 |
38 // A pointer to the message loop's proxy. In case the loop gets destroyed | 39 // A pointer to the message loop's proxy. In case the loop gets destroyed |
39 // before this object goes out of scope, PostTask etc will fail but not crash. | 40 // before this object goes out of scope, PostTask etc will fail but not crash. |
40 scoped_refptr<base::MessageLoopProxy> loop_; | 41 scoped_refptr<base::MessageLoopProxy> loop_; |
41 | 42 |
42 DISALLOW_COPY_AND_ASSIGN(ScopedLoopObserver); | 43 DISALLOW_COPY_AND_ASSIGN(ScopedLoopObserver); |
43 }; | 44 }; |
44 | 45 |
45 #endif // CONTENT_RENDERER_MEDIA_SCOPED_LOOP_OBSERVER_H_ | 46 #endif // CONTENT_RENDERER_MEDIA_SCOPED_LOOP_OBSERVER_H_ |
OLD | NEW |