extension_change_processor.h revision c407dc5cd9bdc5668497f21b26b09d988ab439de 
1// Copyright (c) 2010 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 CHROME_BROWSER_SYNC_GLUE_EXTENSION_CHANGE_PROCESSOR_H_
6#define CHROME_BROWSER_SYNC_GLUE_EXTENSION_CHANGE_PROCESSOR_H_
7
8#include "base/basictypes.h"
9#include "chrome/browser/sync/engine/syncapi.h"
10#include "chrome/browser/sync/glue/change_processor.h"
11#include "chrome/common/notification_observer.h"
12#include "chrome/common/notification_type.h"
13#include "chrome/common/notification_registrar.h"
14
15class NotificationDetails;
16class NotificationSource;
17class Profile;
18
19namespace browser_sync {
20
21class ExtensionModelAssociator;
22class UnrecoverableErrorHandler;
23
24// This class is responsible for taking changes from the
25// ExtensionService and applying them to the sync_api 'syncable'
26// model, and vice versa. All operations and use of this class are
27// from the UI thread.
28class ExtensionChangeProcessor : public ChangeProcessor,
29                                 public NotificationObserver {
30 public:
31  // Does not take ownership of either argument.
32  //
33  // TODO(akalin): Create a Delegate interface and take that instead.
34  // That'll enable us to unit test this class.
35  ExtensionChangeProcessor(
36      UnrecoverableErrorHandler* error_handler,
37      ExtensionModelAssociator* extension_model_associator);
38  virtual ~ExtensionChangeProcessor();
39
40  // NotificationObserver implementation.
41  // BrowserExtensionProvider -> sync_api model change application.
42  virtual void Observe(NotificationType type,
43                       const NotificationSource& source,
44                       const NotificationDetails& details);
45
46  // ChangeProcessor implementation.
47  // sync_api model -> BrowserExtensionProvider change application.
48  virtual void ApplyChangesFromSyncModel(
49      const sync_api::BaseTransaction* trans,
50      const sync_api::SyncManager::ChangeRecord* changes,
51      int change_count);
52
53 protected:
54  // ChangeProcessor implementation.
55  virtual void StartImpl(Profile* profile);
56  virtual void StopImpl();
57
58 private:
59  void StartObserving();
60  void StopObserving();
61
62  ExtensionModelAssociator* extension_model_associator_;
63  NotificationRegistrar notification_registrar_;
64  // Owner of the ExtensionService.  Non-NULL iff |running()| is true.
65  Profile* profile_;
66
67  DISALLOW_COPY_AND_ASSIGN(ExtensionChangeProcessor);
68};
69
70}  // namespace browser_sync
71
72#endif  // CHROME_BROWSER_SYNC_GLUE_EXTENSION_CHANGE_PROCESSOR_H_
73