chromium/components/sync/model/sync_metadata_store.h

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_SYNC_MODEL_SYNC_METADATA_STORE_H_
#define COMPONENTS_SYNC_MODEL_SYNC_METADATA_STORE_H_

#include <string>

#include "components/sync/base/data_type.h"

namespace sync_pb {
class DataTypeState;
class EntityMetadata;
}  // namespace sync_pb

namespace syncer {

// SyncMetadataStore defines the interface implemented by data types for
// persisting sync metadata, both per-entity metadata and the overall datatype
// state. It allows data types to use a common implementation of
// MetadataChangeList (SyncMetadataStoreChangeList) instead of implementing
// their own. In their implementation of
// DataTypeSyncBridge::CreateMetadataChangeList, data types should create an
// instance of SyncMetadataStoreChangeList, passing a pointer to their
// SyncMetadataStore to its constructor. Implementations of SyncMetadataStore
// methods should support add/update/delete operations in the
// data-type-specific sync metadata storage.
class SyncMetadataStore { … };

}  // namespace syncer

#endif  // COMPONENTS_SYNC_MODEL_SYNC_METADATA_STORE_H_