chrome/browser/sync/sync_startup_tracker.h

   1 // Copyright (c) 2013 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 CHROME_BROWSER_SYNC_SYNC_STARTUP_TRACKER_H_
   6 #define CHROME_BROWSER_SYNC_SYNC_STARTUP_TRACKER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "components/sync_driver/sync_service_observer.h"
  11
  12 class Profile;
  13
  14 // SyncStartupTracker provides a centralized way for observers to detect when
  15 // ProfileSyncService has successfully started up, or when startup has failed
  16 // due to some kind of error. This code was originally part of SigninTracker
  17 // but now that sync initialization is no longer a required part of signin,
  18 // it has been broken out of that class so only those places that care about
  19 // sync initialization depend on it.
  20 class SyncStartupTracker : public sync_driver::SyncServiceObserver {
  21  public:
  22   // Observer interface used to notify observers when sync has started up.
  23   class Observer {
  24    public:
  25     virtual ~Observer() {}
  26
  27     virtual void SyncStartupCompleted() = 0;
  28     virtual void SyncStartupFailed() = 0;
  29   };
  30
  31   SyncStartupTracker(Profile* profile, Observer* observer);
  32   ~SyncStartupTracker() override;
  33
  34   enum SyncServiceState {
  35     // Sync backend is still starting up.
  36     SYNC_STARTUP_PENDING,
  37     // An error has been detected that prevents the sync backend from starting
  38     // up.
  39     SYNC_STARTUP_ERROR,
  40     // Sync startup has completed (i.e. ProfileSyncService::SyncActive()
  41     // returns true).
  42     SYNC_STARTUP_COMPLETE
  43   };
  44
  45   // Returns the current state of the sync service.
  46   static SyncServiceState GetSyncServiceState(Profile* profile);
  47
  48   // sync_driver::SyncServiceObserver implementation.
  49   void OnStateChanged() override;
  50
  51  private:
  52   // Checks the current service state and notifies |observer_| if the state
  53   // has changed. Note that it is expected that the observer will free this
  54   // object, so callers should not reference this object after making this call.
  55   void CheckServiceState();
  56
  57   // Profile whose ProfileSyncService we should track.
  58   Profile* profile_;
  59
  60   // Weak pointer to the observer to notify.
  61   Observer* observer_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(SyncStartupTracker);
  64 };
  65
  66 #endif  // CHROME_BROWSER_SYNC_SYNC_STARTUP_TRACKER_H_