lbug 0.15.4

An in-process property graph database management system built for query speed and scalability
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148

#pragma once

#include <functional>
#include <map>
#include <memory>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>

#include "common/assert.h"
#include "common/serializer/reader.h"

namespace lbug {
namespace common {

class LBUG_API Deserializer {
public:
    explicit Deserializer(std::unique_ptr<Reader> reader) : reader(std::move(reader)) {}

    bool finished() const { return reader->finished(); }

    template<typename T>
        requires std::is_trivially_destructible_v<T> || std::is_same_v<std::string, T>
    void deserializeValue(T& value) {
        reader->read(reinterpret_cast<uint8_t*>(&value), sizeof(T));
    }

    void read(uint8_t* data, uint64_t size) const { reader->read(data, size); }

    Reader* getReader() const { return reader.get(); }

    void validateDebuggingInfo(std::string& value, const std::string& expectedVal);

    template<typename T>
    void deserializeOptionalValue(std::unique_ptr<T>& value) {
        bool isNull = false;
        deserializeValue(isNull);
        if (!isNull) {
            value = T::deserialize(*this);
        }
    }

    template<typename T1, typename T2>
    void deserializeMap(std::map<T1, T2>& values) {
        uint64_t mapSize = 0;
        deserializeValue<uint64_t>(mapSize);
        for (auto i = 0u; i < mapSize; i++) {
            T1 key;
            deserializeValue<T1>(key);
            auto val = T2::deserialize(*this);
            values.emplace(key, std::move(val));
        }
    }

    template<typename T1, typename T2>
    void deserializeUnorderedMap(std::unordered_map<T1, T2>& values) {
        uint64_t mapSize = 0;
        deserializeValue<uint64_t>(mapSize);
        for (auto i = 0u; i < mapSize; i++) {
            T1 key;
            deserializeValue<T1>(key);
            T2 val;
            deserializeValue(val);
            values.emplace(key, std::move(val));
        }
    }

    template<typename T1, typename T2>
    void deserializeUnorderedMapOfPtrs(std::unordered_map<T1, std::unique_ptr<T2>>& values) {
        uint64_t mapSize = 0;
        deserializeValue<uint64_t>(mapSize);
        values.reserve(mapSize);
        for (auto i = 0u; i < mapSize; i++) {
            T1 key;
            deserializeValue<T1>(key);
            auto val = T2::deserialize(*this);
            values.emplace(key, std::move(val));
        }
    }

    template<typename T>
    void deserializeVector(std::vector<T>& values) {
        uint64_t vectorSize = 0;
        deserializeValue(vectorSize);
        values.resize(vectorSize);
        for (auto& value : values) {
            if constexpr (requires(Deserializer& deser) { T::deserialize(deser); }) {
                value = T::deserialize(*this);
            } else {
                deserializeValue(value);
            }
        }
    }

    template<typename T, uint64_t ARRAY_SIZE>
    void deserializeArray(std::array<T, ARRAY_SIZE>& values) {
        DASSERT(values.size() == ARRAY_SIZE);
        for (auto& value : values) {
            if constexpr (requires(Deserializer& deser) { T::deserialize(deser); }) {
                value = T::deserialize(*this);
            } else {
                deserializeValue(value);
            }
        }
    }

    template<typename T>
    void deserializeVectorOfPtrs(std::vector<std::unique_ptr<T>>& values) {
        uint64_t vectorSize = 0;
        deserializeValue(vectorSize);
        values.resize(vectorSize);
        for (auto i = 0u; i < vectorSize; i++) {
            values[i] = T::deserialize(*this);
        }
    }

    template<typename T>
    void deserializeVectorOfPtrs(std::vector<std::unique_ptr<T>>& values,
        std::function<std::unique_ptr<T>(Deserializer&)> deserializeFunc) {
        uint64_t vectorSize = 0;
        deserializeValue(vectorSize);
        values.resize(vectorSize);
        for (auto i = 0u; i < vectorSize; i++) {
            values[i] = deserializeFunc(*this);
        }
    }

    template<typename T>
    void deserializeUnorderedSet(std::unordered_set<T>& values) {
        uint64_t setSize = 0;
        deserializeValue(setSize);
        for (auto i = 0u; i < setSize; i++) {
            T value;
            deserializeValue<T>(value);
            values.insert(value);
        }
    }

private:
    std::unique_ptr<Reader> reader;
};

template<>
void Deserializer::deserializeValue(std::string& value);

} // namespace common
} // namespace lbug