| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef COMPONENTS_SYNC_MODEL_DATA_BATCH_H_ |
| #define COMPONENTS_SYNC_MODEL_DATA_BATCH_H_ |
| |
| #include <algorithm> |
| #include <memory> |
| #include <string> |
| #include <utility> |
| |
| #include "components/sync/model/entity_data.h" |
| |
| namespace syncer { |
| |
| using KeyAndData = std::pair<std::string, std::unique_ptr<EntityData>>; |
| |
| // Interface used by the processor to read data requested from the service. |
| class DataBatch { |
| public: |
| DataBatch() {} |
| virtual ~DataBatch() {} |
| |
| // Returns if the data batch has another pair or not. |
| virtual bool HasNext() const = 0; |
| |
| // Returns a pair of storage tag and owned entity data object. Invoking this |
| // method will remove the pair from the batch, and should not be called if |
| // HasNext() returns false. |
| virtual KeyAndData Next() = 0; |
| }; |
| |
| } // namespace syncer |
| |
| #endif // COMPONENTS_SYNC_MODEL_DATA_BATCH_H_ |