mirror of
https://github.com/codership/wsrep-lib.git
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131 lines
3.7 KiB
C++
131 lines
3.7 KiB
C++
/*
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* Copyright (C) 2018 Codership Oy <info@codership.com>
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*
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* This file is part of wsrep-lib.
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*
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* Wsrep-lib is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* Wsrep-lib is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef WSREP_GTID_HPP
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#define WSREP_GTID_HPP
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#include "id.hpp"
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#include "seqno.hpp"
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#include "compiler.hpp"
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#include <iosfwd>
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/**
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* Minimum number of bytes guaratneed to store GTID string representation,
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* terminating '\0' not included (36 + 1 + 20).
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*/
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#define WSREP_LIB_GTID_C_STR_LEN 57
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namespace wsrep
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{
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class gtid
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{
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public:
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gtid()
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: id_()
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, seqno_()
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{ }
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gtid(const wsrep::id& id, wsrep::seqno seqno)
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: id_(id)
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, seqno_(seqno)
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{ }
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const wsrep::id& id() const { return id_; }
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wsrep::seqno seqno() const { return seqno_ ; }
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bool is_undefined() const
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{
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return (seqno_.is_undefined() && id_.is_undefined());
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}
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static const wsrep::gtid& undefined()
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{
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return undefined_;
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}
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bool operator==(const gtid& other) const
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{
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return (
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seqno_ == other.seqno_ &&
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id_ == other.id_
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);
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}
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private:
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static const wsrep::gtid undefined_;
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wsrep::id id_;
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wsrep::seqno seqno_;
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};
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/**
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* Scan a GTID from C string.
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*
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* @param buf Buffer containing the string
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* @param len Length of buffer
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* @param[out] gtid Gtid to be printed to
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*
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* @return Number of bytes scanned, negative value on error.
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*/
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ssize_t scan_from_c_str(const char* buf, size_t buf_len,
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wsrep::gtid& gtid);
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/*
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* Deprecated version of the above for backwards compatibility.
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* Will be removed when all the superprojects have been updated.
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*/
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static inline ssize_t gtid_scan_from_c_str(const char* buf, size_t buf_len,
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wsrep::gtid& gtid)
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{
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return scan_from_c_str(buf, buf_len, gtid);
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}
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/**
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* Print a GTID into character buffer.
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*
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* @param gtid GTID to be printed.
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* @param buf Pointer to the beginning of the buffer
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* @param buf_len Buffer length
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*
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* @return Number of characters printed or negative value for error
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*/
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ssize_t print_to_c_str(const wsrep::gtid& gtid, char* buf, size_t buf_len);
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/*
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* Deprecated version of the above for backwards compatibility.
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* Will be removed when all the superprojects have been updated.
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*/
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static inline ssize_t gtid_print_to_c_str(const wsrep::gtid& gtid,
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char* buf, size_t buf_len)
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{
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return print_to_c_str(gtid, buf, buf_len);
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}
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/**
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* Return minimum number of chars required to store any GTID.
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*/
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static inline size_t gtid_c_str_len() { return WSREP_LIB_GTID_C_STR_LEN; }
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/**
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* Overload for ostream operator<<.
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*/
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std::ostream& operator<<(std::ostream&, const wsrep::gtid&);
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/**
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* Overload for istream operator>>.
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*/
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std::istream& operator>>(std::istream&, wsrep::gtid&);
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}
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#endif // WSREP_GTID_HPP
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