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      1 // Copyright (c) 2011 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_GLUE_SESSION_CHANGE_PROCESSOR_H_
      6 #define CHROME_BROWSER_SYNC_GLUE_SESSION_CHANGE_PROCESSOR_H_
      7 #pragma once
      8 
      9 #include "base/basictypes.h"
     10 #include "chrome/browser/sessions/session_backend.h"
     11 #include "chrome/browser/sessions/session_service.h"
     12 #include "chrome/browser/sync/engine/syncapi.h"
     13 #include "chrome/browser/sync/glue/change_processor.h"
     14 #include "content/common/notification_observer.h"
     15 #include "content/common/notification_registrar.h"
     16 #include "content/common/notification_type.h"
     17 
     18 class NotificationDetails;
     19 class NotificationSource;
     20 class Profile;
     21 
     22 namespace browser_sync {
     23 
     24 class SessionModelAssociator;
     25 class UnrecoverableErrorHandler;
     26 
     27 // This class is responsible for taking changes from the
     28 // SessionService and applying them to the sync_api 'syncable'
     29 // model, and vice versa. All operations and use of this class are
     30 // from the UI thread.
     31 class SessionChangeProcessor : public ChangeProcessor,
     32                                public NotificationObserver {
     33  public:
     34   // Does not take ownership of either argument.
     35   SessionChangeProcessor(
     36       UnrecoverableErrorHandler* error_handler,
     37       SessionModelAssociator* session_model_associator);
     38   SessionChangeProcessor(
     39       UnrecoverableErrorHandler* error_handler,
     40       SessionModelAssociator* session_model_associator,
     41       bool setup_for_test);
     42   virtual ~SessionChangeProcessor();
     43 
     44   // NotificationObserver implementation.
     45   // BrowserSessionProvider -> sync_api model change application.
     46   virtual void Observe(NotificationType type,
     47                        const NotificationSource& source,
     48                        const NotificationDetails& details);
     49 
     50   // ChangeProcessor implementation.
     51   // sync_api model -> BrowserSessionProvider change application.
     52   virtual void ApplyChangesFromSyncModel(
     53       const sync_api::BaseTransaction* trans,
     54       const sync_api::SyncManager::ChangeRecord* changes,
     55       int change_count);
     56 
     57  protected:
     58   // ChangeProcessor implementation.
     59   virtual void StartImpl(Profile* profile);
     60   virtual void StopImpl();
     61  private:
     62   void StartObserving();
     63   void StopObserving();
     64   SessionModelAssociator* session_model_associator_;
     65   NotificationRegistrar notification_registrar_;
     66 
     67   // Owner of the SessionService.  Non-NULL iff |running()| is true.
     68   Profile* profile_;
     69 
     70   // To bypass some checks/codepaths not applicable in tests.
     71   bool setup_for_test_;
     72 
     73   DISALLOW_COPY_AND_ASSIGN(SessionChangeProcessor);
     74 };
     75 
     76 }  // namespace browser_sync
     77 
     78 #endif  // CHROME_BROWSER_SYNC_GLUE_SESSION_CHANGE_PROCESSOR_H_
     79