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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_DATA_BATCH_IMPL_H_ | |
6 #define SYNC_INTERNAL_API_PUBLIC_DATA_BATCH_IMPL_H_ | |
7 | |
8 #include <stddef.h> | |
9 | |
10 #include <memory> | |
11 #include <string> | |
12 #include <utility> | |
13 #include <vector> | |
14 | |
15 #include "base/macros.h" | |
16 #include "sync/api/data_batch.h" | |
17 #include "sync/api/entity_data.h" | |
18 | |
19 namespace syncer_v2 { | |
20 | |
21 // An implementation of DataBatch that's purpose is to transfer ownership of | |
22 // EntityData objects. As soon as this batch recieves the EntityData, it owns | |
23 // them until Next() is invoked, when it gives up ownerhsip. Because a vector | |
24 // is used internally, this impl is unaware when duplcate client_tags are used, | |
25 // and it is the caller's job to avoid this. | |
26 class SYNC_EXPORT DataBatchImpl : public DataBatch { | |
27 public: | |
28 DataBatchImpl(); | |
29 ~DataBatchImpl() override; | |
30 | |
31 // Takes ownership of the data tied to a given tag used for storage. Put | |
32 // should be called at most once for any given client_tag. Data will be | |
33 // readable in the same order that they are put into the batch. | |
34 void Put(const std::string& client_tag, | |
35 std::unique_ptr<EntityData> entity_data); | |
36 | |
37 // DataBatch implementation. | |
38 bool HasNext() const override; | |
39 TagAndData Next() override; | |
40 | |
41 private: | |
42 std::vector<TagAndData> tag_data_pairs_; | |
43 size_t read_index_ = 0; | |
44 | |
45 DISALLOW_COPY_AND_ASSIGN(DataBatchImpl); | |
46 }; | |
47 | |
48 } // namespace syncer_v2 | |
49 | |
50 #endif // SYNC_INTERNAL_API_PUBLIC_DATA_BATCH_IMPL_H_ | |
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