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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 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 MEDIA_MIDI_MIDI_SERVICE_H_ | 5 #ifndef MEDIA_MIDI_MIDI_SERVICE_H_ |
6 #define MEDIA_MIDI_MIDI_SERVICE_H_ | 6 #define MEDIA_MIDI_MIDI_SERVICE_H_ |
7 | 7 |
8 #include <stdint.h> | 8 #include <stdint.h> |
9 | 9 |
10 #include <memory> | 10 #include <memory> |
11 #include <vector> | 11 #include <vector> |
12 | 12 |
13 #include "base/macros.h" | 13 #include "base/macros.h" |
14 #include "base/memory/ref_counted.h" | 14 #include "base/memory/ref_counted.h" |
15 #include "base/single_thread_task_runner.h" | 15 #include "base/single_thread_task_runner.h" |
16 #include "base/synchronization/lock.h" | 16 #include "base/synchronization/lock.h" |
17 #include "base/threading/thread.h" | 17 #include "base/threading/thread.h" |
18 #include "media/midi/midi_export.h" | 18 #include "media/midi/midi_export.h" |
19 #include "media/midi/midi_manager.h" | 19 #include "media/midi/midi_manager.h" |
20 | 20 |
21 namespace midi { | 21 namespace midi { |
22 | 22 |
23 class TaskService; | |
24 | |
23 // Manages MidiManager backends. This class expects to be constructed and | 25 // Manages MidiManager backends. This class expects to be constructed and |
24 // destructed on the browser main thread, but methods can be called on both | 26 // destructed on the browser main thread, but methods can be called on both |
25 // the main thread and the I/O thread. | 27 // the main thread and the I/O thread. |
26 class MIDI_EXPORT MidiService final { | 28 class MIDI_EXPORT MidiService final { |
27 public: | 29 public: |
28 // Use the first constructor for production code. | 30 // Use the first constructor for production code. |
29 MidiService(); | 31 MidiService(); |
30 // |MidiManager| can be explicitly specified in the constructor for testing. | 32 // |MidiManager| can be explicitly specified in the constructor for testing. |
31 explicit MidiService(std::unique_ptr<MidiManager> manager); | 33 explicit MidiService(std::unique_ptr<MidiManager> manager); |
32 ~MidiService(); | 34 ~MidiService(); |
(...skipping 14 matching lines...) Expand all Loading... | |
47 const std::vector<uint8_t>& data, | 49 const std::vector<uint8_t>& data, |
48 double timestamp); | 50 double timestamp); |
49 | 51 |
50 // Returns a SingleThreadTaskRunner reference to serve MidiManager. Each | 52 // Returns a SingleThreadTaskRunner reference to serve MidiManager. Each |
51 // TaskRunner will be constructed on demand. | 53 // TaskRunner will be constructed on demand. |
52 // MidiManager that supports the dynamic instantiation feature will use this | 54 // MidiManager that supports the dynamic instantiation feature will use this |
53 // method to post tasks that should not run on I/O. Since TaskRunners outlive | 55 // method to post tasks that should not run on I/O. Since TaskRunners outlive |
54 // MidiManager, each task should ensure that MidiManager that posted the task | 56 // MidiManager, each task should ensure that MidiManager that posted the task |
55 // is still alive while accessing |this|. TaskRunners will be reused when | 57 // is still alive while accessing |this|. TaskRunners will be reused when |
56 // another MidiManager is instantiated. | 58 // another MidiManager is instantiated. |
59 // TODO(toyoshim): Remove this interface. | |
57 scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner(size_t runner_id); | 60 scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner(size_t runner_id); |
58 | 61 |
62 // Obtains a TaskService that lives with MidiService. | |
63 TaskService* task() { return task_service_.get(); } | |
yhirano
2017/06/07 09:21:03
Maybe task_service is better?
Takashi Toyoshima
2017/06/07 13:00:07
Done.
| |
64 | |
59 private: | 65 private: |
60 // Holds MidiManager instance. If the dynamic instantiation feature is | 66 // Holds MidiManager instance. If the dynamic instantiation feature is |
61 // enabled, the MidiManager would be constructed and destructed on the I/O | 67 // enabled, the MidiManager would be constructed and destructed on the I/O |
62 // thread, and all MidiManager methods would be called on the I/O thread. | 68 // thread, and all MidiManager methods would be called on the I/O thread. |
63 std::unique_ptr<MidiManager> manager_; | 69 std::unique_ptr<MidiManager> manager_; |
64 | 70 |
71 // Holds TaskService instance. | |
72 std::unique_ptr<TaskService> task_service_; | |
73 | |
65 // TaskRunner to destruct |manager_| on the right thread. | 74 // TaskRunner to destruct |manager_| on the right thread. |
66 scoped_refptr<base::SingleThreadTaskRunner> manager_destructor_runner_; | 75 scoped_refptr<base::SingleThreadTaskRunner> manager_destructor_runner_; |
67 | 76 |
68 // A flag to indicate if the dynamic instantiation feature is supported and | 77 // A flag to indicate if the dynamic instantiation feature is supported and |
69 // actually enabled. | 78 // actually enabled. |
70 const bool is_dynamic_instantiation_enabled_; | 79 const bool is_dynamic_instantiation_enabled_; |
71 | 80 |
72 // Counts active clients to manage dynamic MidiManager instantiation. | 81 // Counts active clients to manage dynamic MidiManager instantiation. |
73 size_t active_clients_; | 82 size_t active_clients_; |
74 | 83 |
75 // Protects all members above. | 84 // Protects all members above. |
76 base::Lock lock_; | 85 base::Lock lock_; |
77 | 86 |
78 // Threads to host SingleThreadTaskRunners. | 87 // Threads to host SingleThreadTaskRunners. |
79 std::vector<std::unique_ptr<base::Thread>> threads_; | 88 std::vector<std::unique_ptr<base::Thread>> threads_; |
80 | 89 |
81 // Protects |threads_|. | 90 // Protects |threads_|. |
82 base::Lock threads_lock_; | 91 base::Lock threads_lock_; |
83 | 92 |
84 DISALLOW_COPY_AND_ASSIGN(MidiService); | 93 DISALLOW_COPY_AND_ASSIGN(MidiService); |
85 }; | 94 }; |
86 | 95 |
87 } // namespace midi | 96 } // namespace midi |
88 | 97 |
89 #endif // MEDIA_MIDI_MIDI_SERVICE_H_ | 98 #endif // MEDIA_MIDI_MIDI_SERVICE_H_ |
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