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