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74 lines
2.5 KiB
74 lines
2.5 KiB
/* Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program 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, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file table_id.h
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@brief Contains the class Table_id, mainly used for row based replication.
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*/
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#ifndef TABLE_ID_INCLUDED
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#define TABLE_ID_INCLUDED
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#include <stdint.h>
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#include "wrapper_functions.h"
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/**
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@class Table_id
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@brief Each table share has a table id, it is mainly used for row based
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replication. Meanwhile it is used as table's version too.
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*/
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class Table_id {
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private:
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/* In table map event and rows events, table id is 6 bytes.*/
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static const unsigned long long TABLE_ID_MAX = (~0ULL >> 16);
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uint64_t m_id;
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public:
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Table_id() : m_id(0) {}
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explicit Table_id(unsigned long long id) : m_id(id) {}
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unsigned long long id() const { return m_id; }
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bool is_valid() const { return m_id <= TABLE_ID_MAX; }
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Table_id &operator=(unsigned long long id) {
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m_id = id;
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return *this;
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}
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bool operator==(const Table_id &tid) const { return m_id == tid.m_id; }
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bool operator!=(const Table_id &tid) const { return m_id != tid.m_id; }
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/* Support implicit type converting from Table_id to unsigned long long */
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operator unsigned long long() const { return m_id; }
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Table_id operator++(int) {
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Table_id id(m_id);
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/* m_id is reset to 0, when it exceeds the max value. */
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m_id = (m_id == TABLE_ID_MAX ? 0 : m_id + 1);
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BAPI_ASSERT(m_id <= TABLE_ID_MAX);
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return id;
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}
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};
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#endif
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