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      1 // Copyright (c) 2011 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_PREFERENCE_CHANGE_PROCESSOR_H_
      6 #define CHROME_BROWSER_SYNC_GLUE_PREFERENCE_CHANGE_PROCESSOR_H_
      7 #pragma once
      8 
      9 #include <string>
     10 
     11 #include "chrome/browser/prefs/pref_change_registrar.h"
     12 #include "chrome/browser/prefs/pref_service.h"
     13 #include "chrome/browser/sync/engine/syncapi.h"
     14 #include "chrome/browser/sync/glue/change_processor.h"
     15 #include "chrome/browser/sync/glue/sync_backend_host.h"
     16 #include "content/common/notification_observer.h"
     17 
     18 namespace browser_sync {
     19 
     20 class PreferenceModelAssociator;
     21 class UnrecoverableErrorHandler;
     22 
     23 // This class is responsible for taking changes from the PrefService and
     24 // applying them to the sync_api 'syncable' model, and vice versa. All
     25 // operations and use of this class are from the UI thread.
     26 class PreferenceChangeProcessor : public ChangeProcessor,
     27                                   public NotificationObserver {
     28  public:
     29   PreferenceChangeProcessor(PreferenceModelAssociator* model_associator,
     30                             UnrecoverableErrorHandler* error_handler);
     31   virtual ~PreferenceChangeProcessor();
     32 
     33   // NotificationObserver implementation.
     34   // PrefService -> sync_api model change application.
     35   virtual void Observe(NotificationType type,
     36                        const NotificationSource& source,
     37                        const NotificationDetails& details);
     38 
     39   // sync_api model -> PrefService change application.
     40   virtual void ApplyChangesFromSyncModel(
     41       const sync_api::BaseTransaction* trans,
     42       const sync_api::SyncManager::ChangeRecord* changes,
     43       int change_count);
     44 
     45  protected:
     46   virtual void StartImpl(Profile* profile);
     47   virtual void StopImpl();
     48 
     49  private:
     50   Value* ReadPreference(sync_api::ReadNode* node, std::string* name);
     51 
     52   void StartObserving();
     53   void StopObserving();
     54 
     55   // The model we are processing changes from. Non-NULL when |running_| is true.
     56   PrefService* pref_service_;
     57 
     58   // The two models should be associated according to this ModelAssociator.
     59   PreferenceModelAssociator* model_associator_;
     60 
     61   // Whether we are currently processing a preference change notification.
     62   bool processing_pref_change_;
     63 
     64   PrefChangeRegistrar registrar_;
     65 
     66   DISALLOW_COPY_AND_ASSIGN(PreferenceChangeProcessor);
     67 };
     68 
     69 }  // namespace browser_sync
     70 
     71 #endif  // CHROME_BROWSER_SYNC_GLUE_PREFERENCE_CHANGE_PROCESSOR_H_
     72