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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_EXTENSIONS_SETTINGS_SYNCABLE_SETTINGS_STORAGE_H_
#define CHROME_BROWSER_EXTENSIONS_SETTINGS_SYNCABLE_SETTINGS_STORAGE_H_
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list_threadsafe.h"
#include "base/values.h"
#include "chrome/browser/extensions/settings/setting_sync_data.h"
#include "chrome/browser/extensions/settings/settings_observer.h"
#include "chrome/browser/value_store/value_store.h"
#include "sync/api/sync_change.h"
#include "sync/api/syncable_service.h"
namespace extensions {
class SettingsSyncProcessor;
// Decorates a ValueStore with sync behaviour.
class SyncableSettingsStorage : public ValueStore {
public:
SyncableSettingsStorage(
const scoped_refptr<SettingsObserverList>& observers,
const std::string& extension_id,
// Ownership taken.
ValueStore* delegate);
virtual ~SyncableSettingsStorage();
// ValueStore implementation.
virtual size_t GetBytesInUse(const std::string& key) OVERRIDE;
virtual size_t GetBytesInUse(const std::vector<std::string>& keys) OVERRIDE;
virtual size_t GetBytesInUse() OVERRIDE;
virtual ReadResult Get(const std::string& key) OVERRIDE;
virtual ReadResult Get(const std::vector<std::string>& keys) OVERRIDE;
virtual ReadResult Get() OVERRIDE;
virtual WriteResult Set(
WriteOptions options,
const std::string& key,
const Value& value) OVERRIDE;
virtual WriteResult Set(
WriteOptions options, const DictionaryValue& values) OVERRIDE;
virtual WriteResult Remove(const std::string& key) OVERRIDE;
virtual WriteResult Remove(const std::vector<std::string>& keys) OVERRIDE;
virtual WriteResult Clear() OVERRIDE;
// Sync-related methods, analogous to those on SyncableService (handled by
// ExtensionSettings), but with looser guarantees about when the methods
// can be called.
// Must only be called if sync isn't already active.
syncer::SyncError StartSyncing(
const DictionaryValue& sync_state,
scoped_ptr<SettingsSyncProcessor> sync_processor);
// May be called at any time (idempotent).
void StopSyncing();
// May be called at any time; changes will be ignored if sync isn't active.
syncer::SyncError ProcessSyncChanges(const SettingSyncDataList& sync_changes);
private:
// Sends the changes from |result| to sync if it's enabled.
void SyncResultIfEnabled(const ValueStore::WriteResult& result);
// Sends all local settings to sync (synced settings assumed to be empty).
syncer::SyncError SendLocalSettingsToSync(
const DictionaryValue& settings);
// Overwrites local state with sync state.
syncer::SyncError OverwriteLocalSettingsWithSync(
const DictionaryValue& sync_state, const DictionaryValue& settings);
// Called when an Add/Update/Remove comes from sync. Ownership of Value*s
// are taken.
syncer::SyncError OnSyncAdd(
const std::string& key,
Value* new_value,
ValueStoreChangeList* changes);
syncer::SyncError OnSyncUpdate(
const std::string& key,
Value* old_value,
Value* new_value,
ValueStoreChangeList* changes);
syncer::SyncError OnSyncDelete(
const std::string& key,
Value* old_value,
ValueStoreChangeList* changes);
// List of observers to settings changes.
const scoped_refptr<SettingsObserverList> observers_;
// Id of the extension these settings are for.
std::string const extension_id_;
// Storage area to sync.
const scoped_ptr<ValueStore> delegate_;
// Object which sends changes to sync.
scoped_ptr<SettingsSyncProcessor> sync_processor_;
DISALLOW_COPY_AND_ASSIGN(SyncableSettingsStorage);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_SETTINGS_SYNCABLE_SETTINGS_STORAGE_H_
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