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| 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_EXTENSIONS_SETTINGS_SYNCABLE_SETTINGS_STORAGE_H_ | |
| 6 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_SYNCABLE_SETTINGS_STORAGE_H_ | |
| 7 | |
| 8 #include "base/compiler_specific.h" | |
| 9 #include "base/memory/ref_counted.h" | |
| 10 #include "base/memory/scoped_ptr.h" | |
| 11 #include "base/observer_list_threadsafe.h" | |
| 12 #include "base/values.h" | |
| 13 #include "chrome/browser/extensions/settings/setting_sync_data.h" | |
| 14 #include "chrome/browser/extensions/settings/settings_observer.h" | |
| 15 #include "chrome/browser/value_store/value_store.h" | |
| 16 #include "sync/api/sync_change.h" | |
| 17 #include "sync/api/syncable_service.h" | |
| 18 | |
| 19 namespace extensions { | |
| 20 | |
| 21 class SettingsSyncProcessor; | |
| 22 | |
| 23 // Decorates a ValueStore with sync behaviour. | |
| 24 class SyncableSettingsStorage : public ValueStore { | |
| 25 public: | |
| 26 SyncableSettingsStorage( | |
| 27 const scoped_refptr<SettingsObserverList>& observers, | |
| 28 const std::string& extension_id, | |
| 29 // Ownership taken. | |
| 30 ValueStore* delegate); | |
| 31 | |
| 32 virtual ~SyncableSettingsStorage(); | |
| 33 | |
| 34 // ValueStore implementation. | |
| 35 virtual size_t GetBytesInUse(const std::string& key) OVERRIDE; | |
| 36 virtual size_t GetBytesInUse(const std::vector<std::string>& keys) OVERRIDE; | |
| 37 virtual size_t GetBytesInUse() OVERRIDE; | |
| 38 virtual ReadResult Get(const std::string& key) OVERRIDE; | |
| 39 virtual ReadResult Get(const std::vector<std::string>& keys) OVERRIDE; | |
| 40 virtual ReadResult Get() OVERRIDE; | |
| 41 virtual WriteResult Set( | |
| 42 WriteOptions options, | |
| 43 const std::string& key, | |
| 44 const Value& value) OVERRIDE; | |
| 45 virtual WriteResult Set( | |
| 46 WriteOptions options, const DictionaryValue& values) OVERRIDE; | |
| 47 virtual WriteResult Remove(const std::string& key) OVERRIDE; | |
| 48 virtual WriteResult Remove(const std::vector<std::string>& keys) OVERRIDE; | |
| 49 virtual WriteResult Clear() OVERRIDE; | |
| 50 | |
| 51 // Sync-related methods, analogous to those on SyncableService (handled by | |
| 52 // ExtensionSettings), but with looser guarantees about when the methods | |
| 53 // can be called. | |
| 54 | |
| 55 // Must only be called if sync isn't already active. | |
| 56 syncer::SyncError StartSyncing( | |
| 57 const DictionaryValue& sync_state, | |
| 58 scoped_ptr<SettingsSyncProcessor> sync_processor); | |
| 59 | |
| 60 // May be called at any time (idempotent). | |
| 61 void StopSyncing(); | |
| 62 | |
| 63 // May be called at any time; changes will be ignored if sync isn't active. | |
| 64 syncer::SyncError ProcessSyncChanges(const SettingSyncDataList& sync_changes); | |
| 65 | |
| 66 private: | |
| 67 // Sends the changes from |result| to sync if it's enabled. | |
| 68 void SyncResultIfEnabled(const ValueStore::WriteResult& result); | |
| 69 | |
| 70 // Sends all local settings to sync (synced settings assumed to be empty). | |
| 71 syncer::SyncError SendLocalSettingsToSync( | |
| 72 const DictionaryValue& settings); | |
| 73 | |
| 74 // Overwrites local state with sync state. | |
| 75 syncer::SyncError OverwriteLocalSettingsWithSync( | |
| 76 const DictionaryValue& sync_state, const DictionaryValue& settings); | |
| 77 | |
| 78 // Called when an Add/Update/Remove comes from sync. Ownership of Value*s | |
| 79 // are taken. | |
| 80 syncer::SyncError OnSyncAdd( | |
| 81 const std::string& key, | |
| 82 Value* new_value, | |
| 83 ValueStoreChangeList* changes); | |
| 84 syncer::SyncError OnSyncUpdate( | |
| 85 const std::string& key, | |
| 86 Value* old_value, | |
| 87 Value* new_value, | |
| 88 ValueStoreChangeList* changes); | |
| 89 syncer::SyncError OnSyncDelete( | |
| 90 const std::string& key, | |
| 91 Value* old_value, | |
| 92 ValueStoreChangeList* changes); | |
| 93 | |
| 94 // List of observers to settings changes. | |
| 95 const scoped_refptr<SettingsObserverList> observers_; | |
| 96 | |
| 97 // Id of the extension these settings are for. | |
| 98 std::string const extension_id_; | |
| 99 | |
| 100 // Storage area to sync. | |
| 101 const scoped_ptr<ValueStore> delegate_; | |
| 102 | |
| 103 // Object which sends changes to sync. | |
| 104 scoped_ptr<SettingsSyncProcessor> sync_processor_; | |
| 105 | |
| 106 DISALLOW_COPY_AND_ASSIGN(SyncableSettingsStorage); | |
| 107 }; | |
| 108 | |
| 109 } // namespace extensions | |
| 110 | |
| 111 #endif // CHROME_BROWSER_EXTENSIONS_SETTINGS_SYNCABLE_SETTINGS_STORAGE_H_ | |
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