Updating trunk VERSION from 2139.0 to 2140.0
[chromium-blink-merge.git] / sync / syncable / deferred_on_disk_directory_backing_store.h
blob9e6429a544a6def5707a22a18ae931cbf1c44e23
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.
5 #ifndef SYNC_SYNCABLE_DEFERRED_ON_DISK_DIRECTORY_BACKING_STORE_H_
6 #define SYNC_SYNCABLE_DEFERRED_ON_DISK_DIRECTORY_BACKING_STORE_H_
8 #include "base/files/file_path.h"
9 #include "sync/base/sync_export.h"
10 #include "sync/syncable/directory_backing_store.h"
12 namespace syncer {
13 namespace syncable {
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 DirectoryBackingStore {
22 public:
23 DeferredOnDiskDirectoryBackingStore(const std::string& dir_name,
24 const base::FilePath& backing_filepath);
25 virtual ~DeferredOnDiskDirectoryBackingStore();
26 virtual DirOpenResult Load(
27 Directory::MetahandlesMap* handles_map,
28 JournalIndex* delete_journals,
29 Directory::KernelLoadInfo* kernel_load_info) OVERRIDE;
30 virtual bool SaveChanges(const Directory::SaveChangesSnapshot& snapshot)
31 OVERRIDE;
33 private:
34 base::FilePath backing_filepath_;
36 // Whether current DB is on disk.
37 bool db_is_on_disk_;
39 DISALLOW_COPY_AND_ASSIGN(DeferredOnDiskDirectoryBackingStore);
42 } // namespace syncable
43 } // namespace syncer
45 #endif // SYNC_SYNCABLE_DEFERRED_ON_DISK_DIRECTORY_BACKING_STORE_H_