chrome/browser/prefs/pref_service_syncable.h

   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
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_PREFS_PREF_SERVICE_SYNCABLE_H_
   6 #define CHROME_BROWSER_PREFS_PREF_SERVICE_SYNCABLE_H_
   7
   8 #include "base/prefs/pref_service.h"
   9 #include "chrome/browser/prefs/pref_model_associator.h"
  10 #include "chrome/browser/prefs/synced_pref_observer.h"
  11 #include "components/pref_registry/pref_registry_syncable.h"
  12
  13 class PrefServiceSyncableObserver;
  14 class Profile;
  15
  16 namespace syncer {
  17 class SyncableService;
  18 }
  19
  20 // A PrefService that can be synced. Users are forced to declare
  21 // whether preferences are syncable or not when registering them to
  22 // this PrefService.
  23 class PrefServiceSyncable : public PrefService {
  24  public:
  25   // PrefServiceSyncable is a PrefService with added integration for
  26   // sync, and knowledge of how to create an incognito
  27   // PrefService. For code that does not need to know about the sync
  28   // integration, you should use only the plain PrefService type.
  29   //
  30   // For this reason, Profile does not expose an accessor for the
  31   // PrefServiceSyncable type. Instead, you can use the utilities
  32   // below to retrieve the PrefServiceSyncable (or its incognito
  33   // version) from a Profile.
  34   static PrefServiceSyncable* FromProfile(Profile* profile);
  35   static PrefServiceSyncable* IncognitoFromProfile(Profile* profile);
  36
  37   // You may wish to use PrefServiceFactory or one of its subclasses
  38   // for simplified construction.
  39   PrefServiceSyncable(
  40       PrefNotifierImpl* pref_notifier,
  41       PrefValueStore* pref_value_store,
  42       PersistentPrefStore* user_prefs,
  43       user_prefs::PrefRegistrySyncable* pref_registry,
  44       base::Callback<void(PersistentPrefStore::PrefReadError)>
  45           read_error_callback,
  46       bool async);
  47   virtual ~PrefServiceSyncable();
  48
  49   // Creates an incognito copy of the pref service that shares most pref stores
  50   // but uses a fresh non-persistent overlay for the user pref store and an
  51   // individual extension pref store (to cache the effective extension prefs for
  52   // incognito windows).
  53   PrefServiceSyncable* CreateIncognitoPrefService(
  54       PrefStore* incognito_extension_prefs);
  55
  56   // Returns true if preferences state has synchronized with the remote
  57   // preferences. If true is returned it can be assumed the local preferences
  58   // has applied changes from the remote preferences. The two may not be
  59   // identical if a change is in flight (from either side).
  60   //
  61   // TODO(albertb): Given that we now support priority preferences, callers of
  62   // this method are likely better off making the preferences they care about
  63   // into priority preferences and calling IsPrioritySyncing().
  64   bool IsSyncing();
  65
  66   // Returns true if priority preferences state has synchronized with the remote
  67   // priority preferences.
  68   bool IsPrioritySyncing();
  69
  70   // Returns true if the pref under the given name is pulled down from sync.
  71   // Note this does not refer to SYNCABLE_PREF.
  72   bool IsPrefSynced(const std::string& name) const;
  73
  74   void AddObserver(PrefServiceSyncableObserver* observer);
  75   void RemoveObserver(PrefServiceSyncableObserver* observer);
  76
  77   // TODO(zea): Have PrefServiceSyncable implement
  78   // syncer::SyncableService directly.
  79   syncer::SyncableService* GetSyncableService(const syncer::ModelType& type);
  80
  81   // Do not call this after having derived an incognito or per tab pref service.
  82   virtual void UpdateCommandLinePrefStore(PrefStore* cmd_line_store) OVERRIDE;
  83
  84   void AddSyncedPrefObserver(const std::string& name,
  85                              SyncedPrefObserver* observer);
  86   void RemoveSyncedPrefObserver(const std::string& name,
  87                                 SyncedPrefObserver* observer);
  88
  89  private:
  90   friend class PrefModelAssociator;
  91
  92   void AddRegisteredSyncablePreference(
  93       const char* path,
  94       const user_prefs::PrefRegistrySyncable::PrefSyncStatus sync_status);
  95
  96   // Invoked internally when the IsSyncing() state changes.
  97   void OnIsSyncingChanged();
  98
  99   // Process a local preference change. This can trigger new SyncChanges being
 100   // sent to the syncer.
 101   void ProcessPrefChange(const std::string& name);
 102
 103   // Whether CreateIncognitoPrefService() has been called to create a
 104   // "forked" PrefService.
 105   bool pref_service_forked_;
 106
 107   PrefModelAssociator pref_sync_associator_;
 108   PrefModelAssociator priority_pref_sync_associator_;
 109
 110   ObserverList<PrefServiceSyncableObserver> observer_list_;
 111
 112   DISALLOW_COPY_AND_ASSIGN(PrefServiceSyncable);
 113 };
 114
 115 #endif  // CHROME_BROWSER_PREFS_PREF_SERVICE_SYNCABLE_H_