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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_SYNC_GLUE_SYNCED_DEVICE_TRACKER_H_
#define CHROME_BROWSER_SYNC_GLUE_SYNCED_DEVICE_TRACKER_H_
#include <string>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list_threadsafe.h"
#include "components/sync_driver/change_processor.h"
namespace syncer {
struct UserShare;
}
namespace browser_sync {
class DeviceInfo;
class SyncedDeviceTracker : public ChangeProcessor {
public:
SyncedDeviceTracker(syncer::UserShare* user_share,
const std::string& cache_guid);
virtual ~SyncedDeviceTracker();
// Observer class for listening to device info changes.
class Observer {
public:
virtual void OnDeviceInfoChange() = 0;
};
// ChangeProcessor methods
virtual void StartImpl() OVERRIDE;
virtual void ApplyChangesFromSyncModel(
const syncer::BaseTransaction* trans,
int64 model_version,
const syncer::ImmutableChangeRecordList& changes) OVERRIDE;
virtual void CommitChangesFromSyncModel() OVERRIDE;
// Methods for accessing and updating the device_info list.
// These are virtual for testing.
virtual scoped_ptr<DeviceInfo> ReadLocalDeviceInfo(
const syncer::BaseTransaction &trans) const;
virtual scoped_ptr<DeviceInfo> ReadLocalDeviceInfo() const;
virtual void InitLocalDeviceInfo(const base::Closure& callback);
virtual scoped_ptr<DeviceInfo> ReadDeviceInfo(
const std::string& client_id) const;
virtual void GetAllSyncedDeviceInfo(
ScopedVector<DeviceInfo>* device_info) const;
virtual std::string cache_guid() const;
// Can be called on any thread. Will be notified back on the same thread
// they were called on. Observer will be called on every device info
// change.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Update |backup_timestamp| in local device info specifics to |backup_time|
// if different.
void UpdateLocalDeviceBackupTime(base::Time backup_time);
// Return time derived from |backup_timestamp| in local device info specifics.
base::Time GetLocalDeviceBackupTime() const;
private:
friend class SyncedDeviceTrackerTest;
void InitLocalDeviceInfoContinuation(const base::Closure& callback,
const DeviceInfo& local_info);
// Helper to write specifics into our node. Also useful for testing.
void WriteLocalDeviceInfo(const DeviceInfo& info);
// Helper to write arbitrary device info. Useful for writing local device
// info and also used by test cases to write arbitrary device infos.
void WriteDeviceInfo(const DeviceInfo& info, const std::string& tag);
syncer::UserShare* user_share_;
const std::string cache_guid_;
const std::string local_device_info_tag_;
// The |ObserverList| has to be thread safe as the changes happen
// on sync thread and the observers could be on any thread.
typedef ObserverListThreadSafe<Observer> ObserverList;
scoped_refptr<ObserverList> observers_;
base::WeakPtrFactory<SyncedDeviceTracker> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(SyncedDeviceTracker);
};
} // namespace browser_sync
#endif // CHROME_BROWSER_SYNC_GLUE_SYNCED_DEVICE_TRACKER_H_
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