blob: 8af29f05610057d4056cc906f86198be0e732738 [file] [log] [blame]
// Copyright 2015 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.
#include <string>
namespace sync_pb {
class EntityMetadata;
class ModelTypeState;
} // namespace sync_pb
namespace syncer {
// Interface used by the processor and service to communicate about metadata.
// The purpose of the interface is to record changes to data type global and
// per entity metadata for the purpose of propagating changes to the datatype
// specific storage implementation.
// The implementation of the interface is supposed to keep the record of all
// updated / deleted metadata records and provide a mechanism to enumerate
// them. If there are multiple UpdateMetadata / ClearMetadata calls made for the
// same metadata record the last one is supposed to win.
class MetadataChangeList {
MetadataChangeList() {}
virtual ~MetadataChangeList() {}
// Requests ModelTypeState to be updated in the storage.
virtual void UpdateModelTypeState(
const sync_pb::ModelTypeState& model_type_state) = 0;
// Requests ModelTypeState to be cleared from the storage.
virtual void ClearModelTypeState() = 0;
// Requests metadata entry to be updated in the storage.
// Please note that the update might contain a deleted entry if
// metadata.is_deleted() is true (as opposed to clearing the entry from the
// storage completely by calling the Clear method).
virtual void UpdateMetadata(const std::string& storage_key,
const sync_pb::EntityMetadata& metadata) = 0;
// Requests metadata entry to be cleared from the storage.
virtual void ClearMetadata(const std::string& storage_key) = 0;
} // namespace syncer