chrome/browser/chromeos/drive/change_list_loader_observer.h

   1 // Copyright (c) 2012 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_CHROMEOS_DRIVE_CHANGE_LIST_LOADER_OBSERVER_H_
   6 #define CHROME_BROWSER_CHROMEOS_DRIVE_CHANGE_LIST_LOADER_OBSERVER_H_
   7
   8 namespace base {
   9 class FilePath;
  10 }  // namespace base
  11
  12 namespace drive {
  13 namespace internal {
  14
  15 // Interface for classes that need to observe events from ChangeListLoader.
  16 // All events are notified on UI thread.
  17 class ChangeListLoaderObserver {
  18  public:
  19   // Triggered when a content of a directory has been changed.
  20   // |directory_path| is a virtual directory path representing the
  21   // changed directory.
  22   virtual void OnDirectoryChanged(const base::FilePath& directory_path) {}
  23
  24   // Triggered when loading from the server is complete.
  25   virtual void OnLoadFromServerComplete() {}
  26
  27   // Triggered when loading is complete for the first time, either from the
  28   // the server or the cache. To be precise, for the latter case, we do not
  29   // load anything from the cache. We just check that the resource metadata
  30   // is stored locally thus can be used.
  31   virtual void OnInitialLoadComplete() {}
  32
  33  protected:
  34   virtual ~ChangeListLoaderObserver() {}
  35 };
  36
  37 }  // namespace internal
  38 }  // namespace drive
  39
  40 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_CHANGE_LIST_LOADER_OBSERVER_H_