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// Copyright 2014 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 SYNC_SYNCABLE_DEFERRED_ON_DISK_DIRECTORY_BACKING_STORE_H_
#define SYNC_SYNCABLE_DEFERRED_ON_DISK_DIRECTORY_BACKING_STORE_H_
#include <string>
#include "base/files/file_path.h"
#include "base/macros.h"
#include "sync/base/sync_export.h"
#include "sync/syncable/on_disk_directory_backing_store.h"
namespace syncer {
namespace syncable {
// Store used for backing up user's data before first sync. It creates an
// in-memory store first and switch to on-disk store if SaveChanges() is
// called, which only happens when SyncBackupManager is shut down and a
// syncing backend is to be created. Thus we guarantee that user data is not
// persisted until user is actually going to sync.
class SYNC_EXPORT DeferredOnDiskDirectoryBackingStore
: public OnDiskDirectoryBackingStore {
public:
DeferredOnDiskDirectoryBackingStore(const std::string& dir_name,
const base::FilePath& backing_file_path);
~DeferredOnDiskDirectoryBackingStore() override;
DirOpenResult Load(Directory::MetahandlesMap* handles_map,
JournalIndex* delete_journals,
MetahandleSet* metahandles_to_purge,
Directory::KernelLoadInfo* kernel_load_info) override;
bool SaveChanges(const Directory::SaveChangesSnapshot& snapshot) override;
private:
// Create an on-disk directory backing store. Returns true on success, false
// on error.
bool CreateOnDisk();
// Whether an on-disk directory backing store has been created.
bool created_on_disk_;
DISALLOW_COPY_AND_ASSIGN(DeferredOnDiskDirectoryBackingStore);
};
} // namespace syncable
} // namespace syncer
#endif // SYNC_SYNCABLE_DEFERRED_ON_DISK_DIRECTORY_BACKING_STORE_H_
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