components/sync_driver/device_info_tracker.h

   1 // Copyright 2014 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 COMPONENTS_SYNC_DRIVER_DEVICE_INFO_TRACKER_H_
   6 #define COMPONENTS_SYNC_DRIVER_DEVICE_INFO_TRACKER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/memory/scoped_vector.h"
  10 #include "components/sync_driver/device_info.h"
  11
  12 namespace sync_driver {
  13
  14 // Interface for tracking synced DeviceInfo.
  15 class DeviceInfoTracker {
  16  public:
  17   virtual ~DeviceInfoTracker() {}
  18
  19   // Observer class for listening to device info changes.
  20   class Observer {
  21    public:
  22     virtual void OnDeviceInfoChange() = 0;
  23   };
  24
  25   // Returns true when DeviceInfo datatype is enabled and syncing.
  26   virtual bool IsSyncing() const = 0;
  27   // Gets DeviceInfo the synced device with specified client ID.
  28   // Returns an empty scoped_ptr if device with the given |client_id| hasn't
  29   // been synced.
  30   virtual scoped_ptr<DeviceInfo> GetDeviceInfo(
  31       const std::string& client_id) const = 0;
  32   // Gets DeviceInfo for all synced devices (including the local one).
  33   virtual ScopedVector<DeviceInfo> GetAllDeviceInfo() const = 0;
  34   // Registers an observer to be called on syncing any updated DeviceInfo.
  35   virtual void AddObserver(Observer* observer) = 0;
  36   // Unregisters an observer.
  37   virtual void RemoveObserver(Observer* observer) = 0;
  38 };
  39
  40 }  // namespace sync_driver
  41
  42 #endif  // COMPONENTS_SYNC_DRIVER_DEVICE_INFO_TRACKER_H_