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1 // Copyright 2015 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_API_METADATA_CHANGE_LIST_H_ | |
6 #define SYNC_API_METADATA_CHANGE_LIST_H_ | |
7 | |
8 #include <string> | |
9 | |
10 #include "sync/base/sync_export.h" | |
11 | |
12 namespace sync_pb { | |
13 class DataTypeState; | |
14 class EntityMetadata; | |
15 } // namespace sync_pb | |
16 | |
17 namespace syncer_v2 { | |
18 | |
19 // Interface used by the processor and service to communicate about metadata. | |
20 // The purpose of the interface is to record changes to data type global and | |
21 // per entity metadata for the purpose of propagating changes to the datatype | |
22 // specific storage implementation. | |
23 // The implementation of the interface is supposed to keep the record of all | |
24 // updated / deleted metadata records and provide a mechanism to enumerate | |
25 // them. If there are multiple UpdateMetadata / ClearMetadata calls made for the | |
26 // same metadata record the last one is supposed to win. | |
27 class SYNC_EXPORT MetadataChangeList { | |
28 public: | |
29 MetadataChangeList() {} | |
30 virtual ~MetadataChangeList() {} | |
31 | |
32 // Requests DataTypeState to be updated in the storage. | |
33 virtual void UpdateDataTypeState( | |
34 const sync_pb::DataTypeState& data_type_state) = 0; | |
35 | |
36 // Requests DataTypeState to be cleared from the storage. | |
37 virtual void ClearDataTypeState() = 0; | |
38 | |
39 // Requests metadata entry to be updated in the storage. | |
40 // Please note that the update might contain a deleted entry if | |
41 // metadata.is_deleted() is true (as opposed to clearing the entry from the | |
42 // storage completely by calling the Clear method). | |
43 virtual void UpdateMetadata(const std::string& client_tag, | |
44 const sync_pb::EntityMetadata& metadata) = 0; | |
45 | |
46 // Requests metadata entry to be cleared from the storage. | |
47 virtual void ClearMetadata(const std::string& client_tag) = 0; | |
48 }; | |
49 | |
50 } // namespace syncer_v2 | |
51 | |
52 #endif // SYNC_API_METADATA_CHANGE_LIST_H_ | |
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