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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 COMPONENTS_SYNC_ENGINE_UI_MODEL_WORKER_H_ | 5 #ifndef COMPONENTS_SYNC_ENGINE_UI_MODEL_WORKER_H_ |
6 #define COMPONENTS_SYNC_ENGINE_UI_MODEL_WORKER_H_ | 6 #define COMPONENTS_SYNC_ENGINE_UI_MODEL_WORKER_H_ |
7 | 7 |
8 #include "base/macros.h" | 8 #include "base/macros.h" |
9 #include "base/memory/ref_counted.h" | 9 #include "base/memory/ref_counted.h" |
10 #include "base/sequence_checker.h" | |
11 #include "base/single_thread_task_runner.h" | 10 #include "base/single_thread_task_runner.h" |
12 #include "base/synchronization/waitable_event.h" | |
13 #include "components/sync/engine/model_safe_worker.h" | 11 #include "components/sync/engine/model_safe_worker.h" |
14 | 12 |
15 namespace syncer { | 13 namespace syncer { |
16 | 14 |
17 // A ModelSafeWorker for UI models (e.g. bookmarks) that | 15 // A ModelSafeWorker for UI models (e.g. bookmarks) that |
18 // accepts work requests from the syncapi that need to be fulfilled | 16 // accepts work requests from the syncapi that need to be fulfilled |
19 // from the MessageLoop home to the native model. | 17 // from the MessageLoop home to the native model. |
20 class UIModelWorker : public ModelSafeWorker { | 18 class UIModelWorker : public ModelSafeWorker { |
21 public: | 19 public: |
22 explicit UIModelWorker(scoped_refptr<base::SingleThreadTaskRunner> ui_thread); | 20 explicit UIModelWorker(scoped_refptr<base::SingleThreadTaskRunner> ui_thread); |
23 | 21 |
24 // ModelSafeWorker implementation. | 22 // ModelSafeWorker implementation. |
25 void RequestStop() override; | |
26 ModelSafeGroup GetModelSafeGroup() override; | 23 ModelSafeGroup GetModelSafeGroup() override; |
27 bool IsOnModelThread() override; | 24 bool IsOnModelThread() override; |
28 | 25 |
29 protected: | |
30 SyncerError DoWorkAndWaitUntilDoneImpl(const WorkCallback& work) override; | |
31 | |
32 private: | 26 private: |
33 ~UIModelWorker() override; | 27 ~UIModelWorker() override; |
34 | 28 |
| 29 void ScheduleWork(base::OnceClosure work) override; |
| 30 |
35 // A reference to the UI thread's task runner. | 31 // A reference to the UI thread's task runner. |
36 const scoped_refptr<base::SingleThreadTaskRunner> ui_thread_; | 32 const scoped_refptr<base::SingleThreadTaskRunner> ui_thread_; |
37 | 33 |
38 // Signaled when a task posted by DoWorkAndWaitUntilDoneImpl() is deleted, | |
39 // i.e. after it runs or when it is abandoned. Reset at the beginning of every | |
40 // DoWorkAndWaitUntilDoneImpl() call. | |
41 base::WaitableEvent work_done_or_abandoned_; | |
42 | |
43 // Signaled from RequestStop(). When this is signaled, | |
44 // DoWorkAndWaitUntilDoneImpl() returns immediately. This is needed to prevent | |
45 // the UI thread from joining the sync thread while it is waiting for a | |
46 // WorkCallback to run on the UI thread. See crbug.com/663600. | |
47 base::WaitableEvent stop_requested_; | |
48 | |
49 // Verifies that calls to DoWorkAndWaitUntilDoneImpl() are sequenced. | |
50 base::SequenceChecker sequence_checker_; | |
51 | |
52 DISALLOW_COPY_AND_ASSIGN(UIModelWorker); | 34 DISALLOW_COPY_AND_ASSIGN(UIModelWorker); |
53 }; | 35 }; |
54 | 36 |
55 } // namespace syncer | 37 } // namespace syncer |
56 | 38 |
57 #endif // COMPONENTS_SYNC_ENGINE_UI_MODEL_WORKER_H_ | 39 #endif // COMPONENTS_SYNC_ENGINE_UI_MODEL_WORKER_H_ |
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