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Diffstat (limited to 'storage/perfschema/table_session_status.h')
-rw-r--r-- | storage/perfschema/table_session_status.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/storage/perfschema/table_session_status.h b/storage/perfschema/table_session_status.h new file mode 100644 index 00000000..d338ccaf --- /dev/null +++ b/storage/perfschema/table_session_status.h @@ -0,0 +1,120 @@ +/* Copyright (c) 2015, 2022, Oracle and/or its affiliates. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License, version 2.0, + as published by the Free Software Foundation. + + This program is also distributed with certain software (including + but not limited to OpenSSL) that is licensed under separate terms, + as designated in a particular file or component or in included license + documentation. The authors of MySQL hereby grant you an additional + permission to link the program and your derivative works with the + separately licensed software that they have included with MySQL. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License, version 2.0, for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ + +#ifndef TABLE_SESSION_STATUS_H +#define TABLE_SESSION_STATUS_H + +/** + @file storage/perfschema/table_session_status.h + Table SESSION_STATUS (declarations). +*/ + +#include "pfs_column_types.h" +#include "pfs_engine_table.h" +#include "pfs_instr_class.h" +#include "pfs_instr.h" +#include "table_helper.h" +#include "pfs_variable.h" +/** + @addtogroup Performance_schema_tables + @{ +*/ + +/** + A row of table + PERFORMANCE_SCHEMA.SESSION_STATUS. +*/ +struct row_session_status +{ + /** Column THREAD_ID. */ + ulonglong m_thread_internal_id; + /** Column VARIABLE_NAME. */ + PFS_variable_name_row m_variable_name; + /** Column VARIABLE_VALUE. */ + PFS_variable_value_row m_variable_value; +}; + +/** + Store and retrieve table state information for queries that reinstantiate + the table object. +*/ +class table_session_status_context : public PFS_table_context +{ +public: + table_session_status_context(ulonglong current_version, bool restore) : + PFS_table_context(current_version, restore, THR_PFS_SS) { } +}; + +/** Table PERFORMANCE_SCHEMA.SESSION_STATUS. */ +class table_session_status : public PFS_engine_table +{ + typedef PFS_simple_index pos_t; + +public: + static PFS_engine_table_share_state m_share_state; + /** Table share */ + static PFS_engine_table_share m_share; + static PFS_engine_table* create(); + static ha_rows get_row_count(); + + virtual int rnd_init(bool scan); + virtual int rnd_next(); + virtual int rnd_pos(const void *pos); + virtual void reset_position(void); + +protected: + virtual int read_row_values(TABLE *table, + unsigned char *buf, + Field **fields, + bool read_all); + table_session_status(); + +public: + ~table_session_status() + {} + +protected: + void make_row(const Status_variable *status_var); + +private: + /** Table share lock. */ + static THR_LOCK m_table_lock; + /** Fields definition. */ + static TABLE_FIELD_DEF m_field_def; + + /** Current THD variables. */ + PFS_status_variable_cache m_status_cache; + /** Current row. */ + row_session_status m_row; + /** True if the current row exists. */ + bool m_row_exists; + /** Current position. */ + pos_t m_pos; + /** Next position. */ + pos_t m_next_pos; + + /** Table context with global status array version. */ + table_session_status_context *m_context; +}; + +/** @} */ +#endif |