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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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 // CancelableTaskTracker posts tasks (in the form of a Closure) to a | 5 // CancelableTaskTracker posts tasks (in the form of a Closure) to a |
6 // TaskRunner, and is able to cancel the task later if it's not needed | 6 // TaskRunner, and is able to cancel the task later if it's not needed |
7 // anymore. On destruction, CancelableTaskTracker will cancel all | 7 // anymore. On destruction, CancelableTaskTracker will cancel all |
8 // tracked tasks. | 8 // tracked tasks. |
9 // | 9 // |
10 // Each cancelable task can be associated with a reply (also a Closure). After | 10 // Each cancelable task can be associated with a reply (also a Closure). After |
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29 // are outstanding tasks. This is commonly used to cancel all outstanding | 29 // are outstanding tasks. This is commonly used to cancel all outstanding |
30 // tasks. | 30 // tasks. |
31 // | 31 // |
32 // 2. Both task and reply are deleted on the originating thread. | 32 // 2. Both task and reply are deleted on the originating thread. |
33 // | 33 // |
34 // 3. IsCanceledCallback is thread safe and can be run or deleted on any | 34 // 3. IsCanceledCallback is thread safe and can be run or deleted on any |
35 // thread. | 35 // thread. |
36 #ifndef BASE_TASK_CANCELABLE_TASK_TRACKER_H_ | 36 #ifndef BASE_TASK_CANCELABLE_TASK_TRACKER_H_ |
37 #define BASE_TASK_CANCELABLE_TASK_TRACKER_H_ | 37 #define BASE_TASK_CANCELABLE_TASK_TRACKER_H_ |
38 | 38 |
| 39 #include <stdint.h> |
| 40 |
39 #include "base/base_export.h" | 41 #include "base/base_export.h" |
40 #include "base/basictypes.h" | |
41 #include "base/callback.h" | 42 #include "base/callback.h" |
42 #include "base/containers/hash_tables.h" | 43 #include "base/containers/hash_tables.h" |
| 44 #include "base/macros.h" |
43 #include "base/memory/weak_ptr.h" | 45 #include "base/memory/weak_ptr.h" |
44 #include "base/task_runner_util.h" | 46 #include "base/task_runner_util.h" |
45 #include "base/threading/thread_checker.h" | 47 #include "base/threading/thread_checker.h" |
46 | 48 |
47 namespace tracked_objects { | 49 namespace tracked_objects { |
48 class Location; | 50 class Location; |
49 } // namespace tracked_objects | 51 } // namespace tracked_objects |
50 | 52 |
51 namespace base { | 53 namespace base { |
52 | 54 |
53 class CancellationFlag; | 55 class CancellationFlag; |
54 class TaskRunner; | 56 class TaskRunner; |
55 | 57 |
56 class BASE_EXPORT CancelableTaskTracker { | 58 class BASE_EXPORT CancelableTaskTracker { |
57 public: | 59 public: |
58 // All values except kBadTaskId are valid. | 60 // All values except kBadTaskId are valid. |
59 typedef int64 TaskId; | 61 typedef int64_t TaskId; |
60 static const TaskId kBadTaskId; | 62 static const TaskId kBadTaskId; |
61 | 63 |
62 typedef base::Callback<bool()> IsCanceledCallback; | 64 typedef base::Callback<bool()> IsCanceledCallback; |
63 | 65 |
64 CancelableTaskTracker(); | 66 CancelableTaskTracker(); |
65 | 67 |
66 // Cancels all tracked tasks. | 68 // Cancels all tracked tasks. |
67 ~CancelableTaskTracker(); | 69 ~CancelableTaskTracker(); |
68 | 70 |
69 TaskId PostTask(base::TaskRunner* task_runner, | 71 TaskId PostTask(base::TaskRunner* task_runner, |
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131 base::ThreadChecker thread_checker_; | 133 base::ThreadChecker thread_checker_; |
132 | 134 |
133 base::WeakPtrFactory<CancelableTaskTracker> weak_factory_; | 135 base::WeakPtrFactory<CancelableTaskTracker> weak_factory_; |
134 | 136 |
135 DISALLOW_COPY_AND_ASSIGN(CancelableTaskTracker); | 137 DISALLOW_COPY_AND_ASSIGN(CancelableTaskTracker); |
136 }; | 138 }; |
137 | 139 |
138 } // namespace base | 140 } // namespace base |
139 | 141 |
140 #endif // BASE_TASK_CANCELABLE_TASK_TRACKER_H_ | 142 #endif // BASE_TASK_CANCELABLE_TASK_TRACKER_H_ |
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