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bf64c2dd01
Certification keys are needed for NBO end to resolve dependencies for the write sets which follow NBO end. Without keys the following write sets do not detect dependency to NBO event and may start applying too early.
96 lines
2.3 KiB
C++
96 lines
2.3 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_KEY_HPP
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#define WSREP_KEY_HPP
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#include "exception.hpp"
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#include "buffer.hpp"
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#include <iosfwd>
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namespace wsrep
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{
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/** @class key
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*
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* Certification key type.
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*/
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class key
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{
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public:
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enum type
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{
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shared,
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reference,
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update,
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exclusive
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};
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key(enum type type)
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: type_(type)
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, key_parts_()
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, key_parts_len_()
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{ }
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/**
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* Append key part to key.
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*
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* @param ptr Pointer to key part data. The caller is supposed to take
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* care that the pointer remains valid over the lifetime
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* if the key object.
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* @param len Length of the key part data.
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*/
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void append_key_part(const void* ptr, size_t len)
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{
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if (key_parts_len_ == 3)
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{
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throw wsrep::runtime_error("key parts exceed maximum of 3");
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}
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key_parts_[key_parts_len_] = wsrep::const_buffer(ptr, len);
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++key_parts_len_;
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}
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enum type type() const
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{
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return type_;
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}
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size_t size() const
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{
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return key_parts_len_;
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}
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const wsrep::const_buffer* key_parts() const
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{
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return key_parts_;
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}
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private:
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enum type type_;
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wsrep::const_buffer key_parts_[3];
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size_t key_parts_len_;
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};
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typedef std::vector<wsrep::key> key_array;
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std::ostream& operator<<(std::ostream&, const wsrep::key&);
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}
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#endif // WSREP_KEY_HPP
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