sync/syncable/deferred_on_disk_directory_backing_store.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 SYNC_SYNCABLE_DEFERRED_ON_DISK_DIRECTORY_BACKING_STORE_H_
   6 #define SYNC_SYNCABLE_DEFERRED_ON_DISK_DIRECTORY_BACKING_STORE_H_
   7
   8 #include "base/files/file_path.h"
   9 #include "sync/base/sync_export.h"
  10 #include "sync/syncable/on_disk_directory_backing_store.h"
  11
  12 namespace syncer {
  13 namespace syncable {
  14
  15 // Store used for backing up user's data before first sync. It creates an
  16 // in-memory store first and switch to on-disk store if SaveChanges() is
  17 // called, which only happens when SyncBackupManager is shut down and a
  18 // syncing backend is to be created. Thus we guarantee that user data is not
  19 // persisted until user is actually going to sync.
  20 class SYNC_EXPORT_PRIVATE DeferredOnDiskDirectoryBackingStore
  21     : public OnDiskDirectoryBackingStore {
  22  public:
  23   DeferredOnDiskDirectoryBackingStore(const std::string& dir_name,
  24                                       const base::FilePath& backing_file_path);
  25   ~DeferredOnDiskDirectoryBackingStore() override;
  26   DirOpenResult Load(Directory::MetahandlesMap* handles_map,
  27                      JournalIndex* delete_journals,
  28                      MetahandleSet* metahandles_to_purge,
  29                      Directory::KernelLoadInfo* kernel_load_info) override;
  30   bool SaveChanges(const Directory::SaveChangesSnapshot& snapshot) override;
  31
  32  private:
  33   // Create an on-disk directory backing store. Returns true on success, false
  34   // on error.
  35   bool CreateOnDisk();
  36
  37   // Whether an on-disk directory backing store has been created.
  38   bool created_on_disk_;
  39
  40   DISALLOW_COPY_AND_ASSIGN(DeferredOnDiskDirectoryBackingStore);
  41 };
  42
  43 }  // namespace syncable
  44 }  // namespace syncer
  45
  46 #endif  // SYNC_SYNCABLE_DEFERRED_ON_DISK_DIRECTORY_BACKING_STORE_H_