136 lines
3.8 KiB
C++
136 lines
3.8 KiB
C++
/* Copyright (c) 2017, 2019, 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_PERSISTED_VARIABLES_H
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#define TABLE_PERSISTED_VARIABLES_H
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/**
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@file storage/perfschema/table_persisted_variables.h
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Table PERSISTED_VARIABLES (declarations).
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*/
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#include <sys/types.h>
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#include "my_base.h"
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#include "my_inttypes.h"
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#include "storage/perfschema/pfs.h"
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#include "storage/perfschema/pfs_engine_table.h"
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#include "storage/perfschema/pfs_variable.h"
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#include "storage/perfschema/table_helper.h"
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class Field;
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class Plugin_table;
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struct TABLE;
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struct THR_LOCK;
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/**
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@addtogroup performance_schema_tables
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@{
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*/
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class PFS_index_persisted_variables : public PFS_engine_index {
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public:
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PFS_index_persisted_variables()
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: PFS_engine_index(&m_key), m_key("VARIABLE_NAME") {}
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~PFS_index_persisted_variables() {}
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virtual bool match(const System_variable *pfs);
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private:
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PFS_key_variable_name m_key;
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};
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/**
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Store and retrieve table state information during queries that reinstantiate
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the table object.
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*/
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class table_persisted_variables_context : public PFS_table_context {
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public:
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table_persisted_variables_context(ulonglong hash_version, bool restore)
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: PFS_table_context(hash_version, restore, THR_PFS_SV) {}
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};
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/**
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A row of table
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PERFORMANCE_SCHEMA.PERSISTED_VARIABLES.
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*/
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struct row_persisted_variables {
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/** Column VARIABLE_NAME. */
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PFS_variable_name_row m_variable_name;
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/** Column VARIABLE_VALUE. */
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PFS_variable_value_row m_variable_value;
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};
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/** Table PERFORMANCE_SCHEMA.PERSISTED_VARIABLES. */
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class table_persisted_variables : public PFS_engine_table {
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typedef PFS_simple_index pos_t;
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public:
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/** Table share */
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static PFS_engine_table_share m_share;
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static PFS_engine_table *create(PFS_engine_table_share *);
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static ha_rows get_row_count();
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virtual void reset_position(void);
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virtual int rnd_init(bool scan);
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virtual int rnd_next();
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virtual int rnd_pos(const void *pos);
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virtual int index_init(uint idx, bool sorted);
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virtual int index_next();
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protected:
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virtual int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
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bool read_all);
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table_persisted_variables();
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public:
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~table_persisted_variables() {}
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protected:
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int make_row(const System_variable *system_var);
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private:
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/** Table share lock. */
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static THR_LOCK m_table_lock;
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/** Table definition. */
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static Plugin_table m_table_def;
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/** Current THD variables. */
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PFS_system_persisted_variables_cache m_sysvar_cache;
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/** Current row. */
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row_persisted_variables m_row;
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/** Current position. */
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pos_t m_pos;
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/** Next position. */
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pos_t m_next_pos;
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/** Table context with system variable hash version. */
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table_persisted_variables_context *m_context;
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PFS_index_persisted_variables *m_opened_index;
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};
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/** @} */
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#endif
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