1 | /** |
2 | * Copyright 2021 Alibaba, Inc. and its affiliates. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. |
6 | * You may obtain a copy of the License at |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
10 | * Unless required by applicable law or agreed to in writing, software |
11 | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | * See the License for the specific language governing permissions and |
14 | * limitations under the License. |
15 | |
16 | * \author Haichao.chc |
17 | * \date Jun 2021 |
18 | * \brief ForwardData describes the format of forward data |
19 | */ |
20 | |
21 | |
22 | #pragma once |
23 | |
24 | #include <string> |
25 | #include "../constants.h" |
26 | |
27 | namespace proxima { |
28 | namespace be { |
29 | namespace index { |
30 | |
31 | /* |
32 | * ForwardData packed some meta info with forward data. |
33 | * It provides serialize and deserilize ability. |
34 | */ |
35 | struct ForwardData { |
36 | public: |
37 | /* |
38 | * ForwardHeader contains some header fields. |
39 | */ |
40 | struct { |
41 | uint64_t {0U}; |
42 | uint64_t {0U}; |
43 | uint32_t {0U}; |
44 | uint64_t {0U}; |
45 | |
46 | () { |
47 | primary_key = INVALID_KEY; |
48 | } |
49 | }; |
50 | |
51 | //! Serialize to bytes string |
52 | void serialize(std::string *buf) const { |
53 | buf->clear(); |
54 | buf->append((const char *)&header, sizeof(ForwardHeader)); |
55 | buf->append(data); |
56 | } |
57 | |
58 | //! Deserialize from bytes string |
59 | void deserialize(const std::string &buf) { |
60 | header = *((ForwardHeader *)buf.data()); |
61 | data.assign(buf.data() + sizeof(ForwardHeader), |
62 | buf.size() - sizeof(ForwardHeader)); |
63 | } |
64 | |
65 | ForwardHeader {}; |
66 | std::string data{}; |
67 | }; |
68 | |
69 | |
70 | } // end namespace index |
71 | } // namespace be |
72 | } // end namespace proxima |
73 | |