Refactor syncable DEVICE_INFO type from ChangeProcessor to SyncableService - part 3.

chrome/browser/sync/glue/synced_device_tracker.h

-// 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 sync_driver::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 std::string& signin_scoped_device_id,
-                                   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_