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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 MEDIA_BASE_SERIAL_RUNNER_H_ | 5 #ifndef MEDIA_BASE_SERIAL_RUNNER_H_ |
6 #define MEDIA_BASE_SERIAL_RUNNER_H_ | 6 #define MEDIA_BASE_SERIAL_RUNNER_H_ |
7 | 7 |
8 #include <memory> | 8 #include <memory> |
9 #include <queue> | 9 #include <queue> |
10 | 10 |
11 #include "base/callback.h" | 11 #include "base/callback.h" |
12 #include "base/macros.h" | 12 #include "base/macros.h" |
13 #include "base/memory/ref_counted.h" | 13 #include "base/memory/ref_counted.h" |
14 #include "base/memory/scoped_ptr.h" | |
15 #include "base/memory/weak_ptr.h" | 14 #include "base/memory/weak_ptr.h" |
16 #include "media/base/media_export.h" | 15 #include "media/base/media_export.h" |
17 #include "media/base/pipeline_status.h" | 16 #include "media/base/pipeline_status.h" |
18 | 17 |
19 namespace base { | 18 namespace base { |
20 class SingleThreadTaskRunner; | 19 class SingleThreadTaskRunner; |
21 } | 20 } |
22 | 21 |
23 namespace media { | 22 namespace media { |
24 | 23 |
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57 // | 56 // |
58 // To eliminate an unnecessary posted task, the first function is executed | 57 // To eliminate an unnecessary posted task, the first function is executed |
59 // immediately on the caller's stack. It is *strongly advised* to ensure | 58 // immediately on the caller's stack. It is *strongly advised* to ensure |
60 // the calling code does no more work after the call to Run(). | 59 // the calling code does no more work after the call to Run(). |
61 // | 60 // |
62 // In all cases, |done_cb| is guaranteed to execute on a separate calling | 61 // In all cases, |done_cb| is guaranteed to execute on a separate calling |
63 // stack. | 62 // stack. |
64 // | 63 // |
65 // Deleting the object will prevent execution of any unstarted bound | 64 // Deleting the object will prevent execution of any unstarted bound |
66 // functions, including |done_cb|. | 65 // functions, including |done_cb|. |
67 static scoped_ptr<SerialRunner> Run( | 66 static std::unique_ptr<SerialRunner> Run(const Queue& bound_fns, |
68 const Queue& bound_fns, const PipelineStatusCB& done_cb); | 67 const PipelineStatusCB& done_cb); |
69 | 68 |
70 private: | 69 private: |
71 friend std::default_delete<SerialRunner>; | 70 friend std::default_delete<SerialRunner>; |
72 | 71 |
73 SerialRunner(const Queue& bound_fns, const PipelineStatusCB& done_cb); | 72 SerialRunner(const Queue& bound_fns, const PipelineStatusCB& done_cb); |
74 ~SerialRunner(); | 73 ~SerialRunner(); |
75 | 74 |
76 void RunNextInSeries(PipelineStatus last_status); | 75 void RunNextInSeries(PipelineStatus last_status); |
77 | 76 |
78 scoped_refptr<base::SingleThreadTaskRunner> task_runner_; | 77 scoped_refptr<base::SingleThreadTaskRunner> task_runner_; |
79 Queue bound_fns_; | 78 Queue bound_fns_; |
80 PipelineStatusCB done_cb_; | 79 PipelineStatusCB done_cb_; |
81 | 80 |
82 // NOTE: Weak pointers must be invalidated before all other member variables. | 81 // NOTE: Weak pointers must be invalidated before all other member variables. |
83 base::WeakPtrFactory<SerialRunner> weak_factory_; | 82 base::WeakPtrFactory<SerialRunner> weak_factory_; |
84 | 83 |
85 DISALLOW_COPY_AND_ASSIGN(SerialRunner); | 84 DISALLOW_COPY_AND_ASSIGN(SerialRunner); |
86 }; | 85 }; |
87 | 86 |
88 } // namespace media | 87 } // namespace media |
89 | 88 |
90 #endif // MEDIA_BASE_SERIAL_RUNNER_H_ | 89 #endif // MEDIA_BASE_SERIAL_RUNNER_H_ |
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