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1 // Copyright 2012 The Chromium Authors. All rights reserved. | 1 // Copyright 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 COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_MODEL_WORKER_H_ | 5 #ifndef COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_MODEL_WORKER_H_ |
6 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_MODEL_WORKER_H_ | 6 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_MODEL_WORKER_H_ |
7 | 7 |
8 #include <memory> | 8 #include <memory> |
9 | 9 |
10 #include "base/macros.h" | 10 #include "base/macros.h" |
11 #include "base/memory/ref_counted.h" | 11 #include "base/memory/ref_counted.h" |
12 #include "base/memory/weak_ptr.h" | 12 #include "base/memory/weak_ptr.h" |
13 #include "base/single_thread_task_runner.h" | 13 #include "base/single_thread_task_runner.h" |
14 #include "base/synchronization/lock.h" | |
15 #include "base/synchronization/waitable_event.h" | |
14 #include "base/task/cancelable_task_tracker.h" | 16 #include "base/task/cancelable_task_tracker.h" |
15 #include "components/sync/engine/model_safe_worker.h" | 17 #include "components/sync/engine/model_safe_worker.h" |
16 | 18 |
17 namespace history { | 19 namespace history { |
18 class HistoryService; | 20 class HistoryService; |
19 } | 21 } |
20 | 22 |
21 namespace browser_sync { | 23 namespace browser_sync { |
22 | 24 |
23 // A syncer::ModelSafeWorker for history models that accepts requests | 25 // A syncer::ModelSafeWorker for history models that accepts requests |
24 // from the syncapi that need to be fulfilled on the history thread. | 26 // from the syncapi that need to be fulfilled on the history thread. |
25 class HistoryModelWorker : public syncer::ModelSafeWorker { | 27 class HistoryModelWorker : public syncer::ModelSafeWorker { |
26 public: | 28 public: |
27 explicit HistoryModelWorker( | 29 explicit HistoryModelWorker( |
28 const base::WeakPtr<history::HistoryService>& history_service, | 30 const base::WeakPtr<history::HistoryService>& history_service, |
29 const scoped_refptr<base::SingleThreadTaskRunner>& ui_thread); | 31 const scoped_refptr<base::SingleThreadTaskRunner>& ui_thread); |
30 | 32 |
31 // syncer::ModelSafeWorker implementation. | 33 // syncer::ModelSafeWorker implementation. |
34 void RequestStop() override; | |
32 syncer::ModelSafeGroup GetModelSafeGroup() override; | 35 syncer::ModelSafeGroup GetModelSafeGroup() override; |
33 bool IsOnModelThread() override; | 36 bool IsOnModelThread() override; |
34 | 37 |
35 protected: | 38 protected: |
36 syncer::SyncerError DoWorkAndWaitUntilDoneImpl( | 39 syncer::SyncerError DoWorkAndWaitUntilDoneImpl( |
37 const syncer::WorkCallback& work) override; | 40 const syncer::WorkCallback& work) override; |
38 | 41 |
39 private: | 42 private: |
43 class WorkerTask; | |
44 | |
40 ~HistoryModelWorker() override; | 45 ~HistoryModelWorker() override; |
41 | 46 |
47 // Called before a WorkCallback starts running. If this returns false, the | |
maxbogue
2017/03/20 16:52:37
nit: mention the side effect of this function some
fdoray
2017/03/20 18:54:54
n/a
| |
48 // WorkCallback must not run. | |
49 bool WillRunWorkCallback(); | |
50 | |
51 // Called after a WorkCallback has run. | |
52 void DidRunWorkCallback(); | |
53 | |
42 const base::WeakPtr<history::HistoryService> history_service_; | 54 const base::WeakPtr<history::HistoryService> history_service_; |
43 | 55 |
44 // A reference to the UI thread's task runner. | 56 // A reference to the UI thread's task runner. |
45 const scoped_refptr<base::SingleThreadTaskRunner> ui_thread_; | 57 const scoped_refptr<base::SingleThreadTaskRunner> ui_thread_; |
46 | 58 |
59 // Signaled when a task posted by DoWorkAndWaitUntilDoneImpl() is deleted, | |
60 // i.e. after it runs or when it is abandoned. Reset at the beginning of every | |
61 // DoWorkAndWaitUntilDoneImpl() call. | |
62 base::WaitableEvent work_done_or_abandoned_; | |
63 | |
64 // Signaled to unblock DoWorkAndWaitUntilDoneImpl() and prevent any | |
65 // WorkCallback from being scheduled when RequestStop() is called and there is | |
66 // no pending task from this worker on the history DB thread. | |
67 base::WaitableEvent stop_requested_; | |
68 | |
69 // True if a WorkCallback posted by this worker is currently running. | |
70 bool work_callback_running_ = false; | |
71 | |
72 // Synchronizes access to |stop_requested_| and |work_callback_running_|. | |
73 base::Lock lock_; | |
74 | |
47 // Helper object to make sure we don't leave tasks running on the history | 75 // Helper object to make sure we don't leave tasks running on the history |
48 // thread. | 76 // thread. |
49 std::unique_ptr<base::CancelableTaskTracker> cancelable_tracker_; | 77 std::unique_ptr<base::CancelableTaskTracker> cancelable_tracker_; |
50 | 78 |
79 // Verifies that calls to DoWorkAndWaitUntilDoneImpl() are sequenced. | |
80 base::SequenceChecker sequence_checker_; | |
81 | |
51 DISALLOW_COPY_AND_ASSIGN(HistoryModelWorker); | 82 DISALLOW_COPY_AND_ASSIGN(HistoryModelWorker); |
52 }; | 83 }; |
53 | 84 |
54 } // namespace browser_sync | 85 } // namespace browser_sync |
55 | 86 |
56 #endif // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_MODEL_WORKER_H_ | 87 #endif // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_MODEL_WORKER_H_ |
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