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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_DATA_BATCH_H_ | |
6 #define SYNC_API_DATA_BATCH_H_ | |
7 | |
8 #include <algorithm> | |
9 #include <memory> | |
10 #include <string> | |
11 #include <utility> | |
12 | |
13 #include "sync/api/entity_data.h" | |
14 #include "sync/base/sync_export.h" | |
15 | |
16 namespace syncer_v2 { | |
17 | |
18 typedef std::pair<std::string, std::unique_ptr<EntityData>> TagAndData; | |
19 | |
20 // Interface used by the processor to read data requested from the service. | |
21 class SYNC_EXPORT DataBatch { | |
22 public: | |
23 DataBatch() {} | |
24 virtual ~DataBatch() {} | |
25 | |
26 // Returns if the data batch has another pair or not. | |
27 virtual bool HasNext() const = 0; | |
28 | |
29 // Returns a pair of storage tag and owned entity data object. Invoking this | |
30 // method will remove the pair from the batch, and should not be called if | |
31 // HasNext() returns false. | |
32 virtual TagAndData Next() = 0; | |
33 }; | |
34 | |
35 } // namespace syncer_v2 | |
36 | |
37 #endif // SYNC_API_DATA_BATCH_H_ | |
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