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100 lines
2.7 KiB
100 lines
2.7 KiB
5 months ago
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/* Copyright (c) 2005, 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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#ifndef TABLE_MAPPING_H
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#define TABLE_MAPPING_H
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#include <sys/types.h>
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#include "map_helpers.h"
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#include "my_alloc.h"
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#include "my_inttypes.h"
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/* Forward declarations */
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#ifdef MYSQL_SERVER
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struct TABLE;
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typedef TABLE Mapped_table;
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#else
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class Table_map_log_event;
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typedef Table_map_log_event Mapped_table;
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#endif
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/**
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Maps table id's (integers) to table pointers.
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In mysqlbinlog, "table pointer" means Table_map_log_event*.
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In the server, "table pointer" means TABLE*.
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*/
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class table_mapping {
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private:
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MEM_ROOT m_mem_root;
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public:
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enum enum_error {
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ERR_NO_ERROR = 0,
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ERR_LIMIT_EXCEEDED,
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ERR_MEMORY_ALLOCATION
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};
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table_mapping();
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~table_mapping();
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Mapped_table *get_table(ulonglong table_id);
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int set_table(ulonglong table_id, Mapped_table *table);
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int remove_table(ulonglong table_id);
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void clear_tables();
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ulong count() const { return static_cast<ulong>(m_table_ids.size()); }
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private:
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struct entry {
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ulonglong table_id;
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union {
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Mapped_table *table;
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entry *next;
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};
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};
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int expand();
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/*
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Head of the list of free entries; "free" in the sense that it's an
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allocated entry free for use, NOT in the sense that it's freed
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memory.
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*/
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entry *m_free;
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/*
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Map from table ids (numbers) to Mapped_table objects.
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No destructor for entries passed here, as the entries are allocated in a
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MEM_ROOT (freed as a whole in the destructor), they cannot be freed one by
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one.
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*/
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malloc_unordered_map<ulonglong, entry *> m_table_ids;
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};
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#endif
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