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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_INTERNAL_API_PUBLIC_SIMPLE_METADATA_CHANGE_LIST_H_ | |
6 #define SYNC_INTERNAL_API_PUBLIC_SIMPLE_METADATA_CHANGE_LIST_H_ | |
7 | |
8 #include <map> | |
9 #include <string> | |
10 | |
11 #include "sync/api/metadata_change_list.h" | |
12 #include "sync/api/model_type_store.h" | |
13 #include "sync/base/sync_export.h" | |
14 #include "sync/internal_api/public/non_blocking_sync_common.h" | |
15 #include "sync/protocol/data_type_state.pb.h" | |
16 #include "sync/protocol/entity_metadata.pb.h" | |
17 | |
18 namespace syncer_v2 { | |
19 | |
20 // A MetadataChangeList implementation that is meant to be used in combination | |
21 // with a ModelTypeStore. It accumulates changes in member fields, and then when | |
22 // requested transfers them to the store/write batch. | |
23 class SYNC_EXPORT SimpleMetadataChangeList : public MetadataChangeList { | |
24 public: | |
25 enum ChangeType { UPDATE, CLEAR }; | |
26 | |
27 struct MetadataChange { | |
28 ChangeType type; | |
29 sync_pb::EntityMetadata metadata; | |
30 }; | |
31 | |
32 struct DataTypeStateChange { | |
33 ChangeType type; | |
34 sync_pb::DataTypeState state; | |
35 }; | |
36 | |
37 typedef std::map<std::string, MetadataChange> MetadataChanges; | |
38 | |
39 SimpleMetadataChangeList(); | |
40 ~SimpleMetadataChangeList() override; | |
41 | |
42 void UpdateDataTypeState( | |
43 const sync_pb::DataTypeState& data_type_state) override; | |
44 void ClearDataTypeState() override; | |
45 void UpdateMetadata(const std::string& client_tag, | |
46 const sync_pb::EntityMetadata& metadata) override; | |
47 void ClearMetadata(const std::string& client_tag) override; | |
48 | |
49 const MetadataChanges& GetMetadataChanges() const; | |
50 bool HasDataTypeStateChange() const; | |
51 const DataTypeStateChange& GetDataTypeStateChange() const; | |
52 | |
53 // Moves all currently accumulated changes into the write batch, clear out | |
54 // local copies. Calling this multiple times will work, but should not be | |
55 // necessary. | |
56 void TransferChanges(ModelTypeStore* store, | |
57 ModelTypeStore::WriteBatch* write_batch); | |
58 | |
59 private: | |
60 MetadataChanges metadata_changes_; | |
61 std::unique_ptr<DataTypeStateChange> state_change_; | |
62 }; | |
63 | |
64 } // namespace syncer_v2 | |
65 | |
66 #endif // SYNC_INTERNAL_API_PUBLIC_SIMPLE_METADATA_CHANGE_LIST_H_ | |
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