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// Copyright (c) 2010 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_SYNC_GLUE_PREFERENCE_CHANGE_PROCESSOR_H_
#define CHROME_BROWSER_SYNC_GLUE_PREFERENCE_CHANGE_PROCESSOR_H_
#pragma once
#include <string>
#include "chrome/browser/prefs/pref_change_registrar.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/sync/engine/syncapi.h"
#include "chrome/browser/sync/glue/change_processor.h"
#include "chrome/browser/sync/glue/sync_backend_host.h"
#include "chrome/common/notification_observer.h"
namespace browser_sync {
class PreferenceModelAssociator;
class UnrecoverableErrorHandler;
// This class is responsible for taking changes from the PrefService and
// applying them to the sync_api 'syncable' model, and vice versa. All
// operations and use of this class are from the UI thread.
class PreferenceChangeProcessor : public ChangeProcessor,
public NotificationObserver {
public:
PreferenceChangeProcessor(PreferenceModelAssociator* model_associator,
UnrecoverableErrorHandler* error_handler);
virtual ~PreferenceChangeProcessor();
// NotificationObserver implementation.
// PrefService -> sync_api model change application.
virtual void Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details);
// sync_api model -> PrefService change application.
virtual void ApplyChangesFromSyncModel(
const sync_api::BaseTransaction* trans,
const sync_api::SyncManager::ChangeRecord* changes,
int change_count);
protected:
virtual void StartImpl(Profile* profile);
virtual void StopImpl();
private:
Value* ReadPreference(sync_api::ReadNode* node, std::string* name);
void StartObserving();
void StopObserving();
// The model we are processing changes from. Non-NULL when |running_| is true.
PrefService* pref_service_;
// The two models should be associated according to this ModelAssociator.
PreferenceModelAssociator* model_associator_;
// Whether we are currently processing a preference change notification.
bool processing_pref_change_;
PrefChangeRegistrar registrar_;
DISALLOW_COPY_AND_ASSIGN(PreferenceChangeProcessor);
};
} // namespace browser_sync
#endif // CHROME_BROWSER_SYNC_GLUE_PREFERENCE_CHANGE_PROCESSOR_H_
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