MySQL 9.1.0
Source Code Documentation
gcs_xcom_synode.h
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23
24#ifndef GCS_XCOM_SYNODE_H
25#define GCS_XCOM_SYNODE_H
26
27#include <sstream>
28#include <unordered_set>
30
31/**
32 Defines a message identifier so that joining members can fetch the associated
33 packet from a remote node.
34
35 See Gcs_xcom_communication_interface::recover_packets.
36
37 It wraps synode_no so we can use it in hash-based containers.
38 */
40 public:
41 Gcs_xcom_synode() noexcept;
42 explicit Gcs_xcom_synode(synode_no synod) noexcept;
43
45
46 Gcs_xcom_synode(Gcs_xcom_synode const &other) = default;
47 Gcs_xcom_synode &operator=(Gcs_xcom_synode const &other) = default;
48
49 Gcs_xcom_synode(Gcs_xcom_synode &&other) noexcept;
50 Gcs_xcom_synode &operator=(Gcs_xcom_synode &&other) noexcept;
51
52 bool operator==(const Gcs_xcom_synode &other) const;
53
54 synode_no const &get_synod() const;
55
56 private:
57 synode_no synode_;
58};
59
60/*
61 Specialization of std::hash<Gcs_xcom_synode> so we can use it in hash-based
62 containers.
63 */
64namespace std {
65template <>
66struct hash<Gcs_xcom_synode> {
67 std::size_t operator()(Gcs_xcom_synode const &s) const noexcept {
68 /*
69 Represent the synode as a string of the format g<gid>m<msg_nr>n<node_nr> to
70 serve as the hash function argument.
71 */
72 std::hash<std::string> hash_function;
73
74 std::ostringstream formatter;
75 formatter << "g" << s.get_synod().group_id << "m" << s.get_synod().msgno
76 << "n" << s.get_synod().node;
77 auto representation = formatter.str();
78
79 return hash_function(representation);
80 }
81};
82} // namespace std
83
84using Gcs_xcom_synode_set = std::unordered_set<Gcs_xcom_synode>;
85
86#endif // GCS_XCOM_SYNODE_H
Defines a message identifier so that joining members can fetch the associated packet from a remote no...
Definition: gcs_xcom_synode.h:39
Gcs_xcom_synode() noexcept
Definition: gcs_xcom_synode.cc:26
synode_no synode_
Definition: gcs_xcom_synode.h:57
Gcs_xcom_synode & operator=(Gcs_xcom_synode const &other)=default
Gcs_xcom_synode(Gcs_xcom_synode const &other)=default
bool operator==(const Gcs_xcom_synode &other) const
Definition: gcs_xcom_synode.cc:43
synode_no const & get_synod() const
Definition: gcs_xcom_synode.cc:47
std::unordered_set< Gcs_xcom_synode > Gcs_xcom_synode_set
Definition: gcs_xcom_synode.h:84
Definition: gcs_xcom_synode.h:64
std::basic_ostringstream< char, std::char_traits< char >, ut::allocator< char > > ostringstream
Specialization of basic_ostringstream which uses ut::allocator.
Definition: ut0new.h:2872
std::size_t operator()(Gcs_xcom_synode const &s) const noexcept
Definition: gcs_xcom_synode.h:67