components/sync_driver/sync_error_controller.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_SYNC_ERROR_CONTROLLER_H_
   6 #define COMPONENTS_SYNC_DRIVER_SYNC_ERROR_CONTROLLER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/observer_list.h"
  11 #include "components/sync_driver/sync_service_observer.h"
  12
  13 namespace sync_driver {
  14 class SyncService;
  15 }
  16
  17 // Keep track of sync errors and expose them to observers in the UI.
  18 class SyncErrorController : public sync_driver::SyncServiceObserver {
  19  public:
  20   // The observer class for SyncErrorController lets the controller notify
  21   // observers when an error arises or changes.
  22   class Observer {
  23    public:
  24     virtual ~Observer() {}
  25     virtual void OnErrorChanged() = 0;
  26   };
  27
  28   explicit SyncErrorController(sync_driver::SyncService* service);
  29   ~SyncErrorController() override;
  30
  31   // True if there exists an error worth elevating to the user.
  32   bool HasError();
  33
  34   void AddObserver(Observer* observer);
  35   void RemoveObserver(Observer* observer);
  36
  37   // sync_driver::SyncServiceObserver:
  38   void OnStateChanged() override;
  39
  40  private:
  41   sync_driver::SyncService* service_;
  42   base::ObserverList<Observer, true> observer_list_;
  43
  44   DISALLOW_COPY_AND_ASSIGN(SyncErrorController);
  45 };
  46
  47 #endif  // COMPONENTS_SYNC_DRIVER_SYNC_ERROR_CONTROLLER_H_