| OLD | NEW |
|---|
| (Empty) |
| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BASE_DEFERRED_SEQUENCED_TASK_RUNNER_H_ | |
| 6 #define BASE_DEFERRED_SEQUENCED_TASK_RUNNER_H_ | |
| 7 | |
| 8 #include <vector> | |
| 9 | |
| 10 #include "base/base_export.h" | |
| 11 #include "base/basictypes.h" | |
| 12 #include "base/callback.h" | |
| 13 #include "base/compiler_specific.h" | |
| 14 #include "base/memory/ref_counted.h" | |
| 15 #include "base/sequenced_task_runner.h" | |
| 16 #include "base/synchronization/lock.h" | |
| 17 #include "base/time/time.h" | |
| 18 #include "base/tracked_objects.h" | |
| 19 | |
| 20 namespace base { | |
| 21 | |
| 22 // A DeferredSequencedTaskRunner is a subclass of SequencedTaskRunner that | |
| 23 // queues up all requests until the first call to Start() is issued. | |
| 24 class BASE_EXPORT DeferredSequencedTaskRunner : public SequencedTaskRunner { | |
| 25 public: | |
| 26 explicit DeferredSequencedTaskRunner( | |
| 27 const scoped_refptr<SequencedTaskRunner>& target_runner); | |
| 28 | |
| 29 // TaskRunner implementation | |
| 30 bool PostDelayedTask(const tracked_objects::Location& from_here, | |
| 31 const Closure& task, | |
| 32 TimeDelta delay) override; | |
| 33 bool RunsTasksOnCurrentThread() const override; | |
| 34 | |
| 35 // SequencedTaskRunner implementation | |
| 36 bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here, | |
| 37 const Closure& task, | |
| 38 TimeDelta delay) override; | |
| 39 | |
| 40 // Start the execution - posts all queued tasks to the target executor. The | |
| 41 // deferred tasks are posted with their initial delay, meaning that the task | |
| 42 // execution delay is actually measured from Start. | |
| 43 // Fails when called a second time. | |
| 44 void Start(); | |
| 45 | |
| 46 private: | |
| 47 struct DeferredTask { | |
| 48 DeferredTask(); | |
| 49 ~DeferredTask(); | |
| 50 | |
| 51 tracked_objects::Location posted_from; | |
| 52 Closure task; | |
| 53 // The delay this task was initially posted with. | |
| 54 TimeDelta delay; | |
| 55 bool is_non_nestable; | |
| 56 }; | |
| 57 | |
| 58 ~DeferredSequencedTaskRunner() override; | |
| 59 | |
| 60 // Creates a |Task| object and adds it to |deferred_tasks_queue_|. | |
| 61 void QueueDeferredTask(const tracked_objects::Location& from_here, | |
| 62 const Closure& task, | |
| 63 TimeDelta delay, | |
| 64 bool is_non_nestable); | |
| 65 | |
| 66 // // Protects |started_| and |deferred_tasks_queue_|. | |
| 67 mutable Lock lock_; | |
| 68 | |
| 69 bool started_; | |
| 70 const scoped_refptr<SequencedTaskRunner> target_task_runner_; | |
| 71 std::vector<DeferredTask> deferred_tasks_queue_; | |
| 72 | |
| 73 DISALLOW_COPY_AND_ASSIGN(DeferredSequencedTaskRunner); | |
| 74 }; | |
| 75 | |
| 76 } // namespace base | |
| 77 | |
| 78 #endif // BASE_DEFERRED_SEQUENCED_TASK_RUNNER_H_ | |
| OLD | NEW |
|---|
Chromium Code Reviews
