sync: take two for: "Added classes to enable session sync...

chrome/browser/sync/glue/session_change_processor.h

+// Copyright (c) 2010 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_SESSION_CHANGE_PROCESSOR_H_
+#define CHROME_BROWSER_SYNC_GLUE_SESSION_CHANGE_PROCESSOR_H_
+#pragma once
+
+#include <vector>
+#include "base/basictypes.h"
+#include "chrome/browser/sessions/session_backend.h"
+#include "chrome/browser/sessions/session_service.h"
+#include "chrome/browser/sync/engine/syncapi.h"
+#include "chrome/browser/sync/glue/change_processor.h"
+#include "chrome/common/notification_observer.h"
+#include "chrome/common/notification_type.h"
+#include "chrome/common/notification_registrar.h"
+
+class NotificationDetails;
+class NotificationSource;
+class Profile;
+
+namespace browser_sync {
+
+class SessionModelAssociator;
+class UnrecoverableErrorHandler;
+
+// This class is responsible for taking changes from the
+// SessionService and applying them to the sync_api 'syncable'
+// model, and vice versa. All operations and use of this class are
+// from the UI thread.
+class SessionChangeProcessor : public ChangeProcessor,
+                               public NotificationObserver {
+ public:
+  // Does not take ownership of either argument.
+  SessionChangeProcessor(
+      UnrecoverableErrorHandler* error_handler,
+      SessionModelAssociator* session_model_associator);
+  virtual ~SessionChangeProcessor();
+
+  // NotificationObserver implementation.
+  // BrowserSessionProvider -> sync_api model change application.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+  // ChangeProcessor implementation.
+  // sync_api model -> BrowserSessionProvider change application.
+  virtual void ApplyChangesFromSyncModel(
+      const sync_api::BaseTransaction* trans,
+      const sync_api::SyncManager::ChangeRecord* changes,
+      int change_count);
+
+ protected:
+  // ChangeProcessor implementation.
+  virtual void StartImpl(Profile* profile);
+  virtual void StopImpl();
+ private:
+  void StartObserving();
+  void StopObserving();
+  void UpdateModel(const sync_api::BaseTransaction* trans,
+      const sync_api::SyncManager::ChangeRecord& change, bool associate);
+  SessionModelAssociator* session_model_associator_;
+  NotificationRegistrar notification_registrar_;
+
+  // Owner of the SessionService.  Non-NULL iff |running()| is true.
+  Profile* profile_;
+
+  DISALLOW_COPY_AND_ASSIGN(SessionChangeProcessor);
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_GLUE_SESSION_CHANGE_PROCESSOR_H_
+