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