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/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 DirectoryBackingStore {
  22  public:
  23   DeferredOnDiskDirectoryBackingStore(const std::string& dir_name,
  24                                       const base::FilePath& backing_filepath);
  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   base::FilePath backing_filepath_;
  34
  35   // Whether current DB is on disk.
  36   bool db_is_on_disk_;
  37
  38   DISALLOW_COPY_AND_ASSIGN(DeferredOnDiskDirectoryBackingStore);
  39 };
  40
  41 }  // namespace syncable
  42 }  // namespace syncer
  43
  44 #endif  // SYNC_SYNCABLE_DEFERRED_ON_DISK_DIRECTORY_BACKING_STORE_H_