System variable cache. More...

#include <pfs_variable.h>

Inheritance diagram for PFS_system_variable_cache:

Public Member Functions
	PFS_system_variable_cache (bool external_init)

bool	match_scope (int scope)
	Match system variable scope to desired scope. More...

ulonglong	get_sysvar_hash_version ()

	~PFS_system_variable_cache () override

Public Member Functions inherited from PFS_variable_cache< System_variable >
	PFS_variable_cache (bool external_init)

virtual	~PFS_variable_cache ()=0
	Destructor. More...

bool	initialize_session ()
	Build array of SHOW_VARs from the external variable source. More...

bool	initialize_client_session ()
	Build array of SHOW_VARs suitable for aggregation by user, host or account. More...

int	materialize_global ()
	Build cache of GLOBAL system or status variables. More...

int	materialize_all (THD *thd)
	Build cache of GLOBAL and SESSION variables for a non-instrumented thread. More...

int	materialize_session (THD *thd)
	Build cache of SESSION variables for a non-instrumented thread. More...

int	materialize_session (PFS_thread *pfs_thread, bool use_mem_root=false)
	Build cache of SESSION variables for an instrumented thread. More...

int	materialize_session (PFS_thread *pfs_thread, uint index)
	Cache a single SESSION variable for an instrumented thread. More...

int	materialize_user (PFS_user *pfs_user)
	Build cache of SESSION status variables for a user. More...

int	materialize_host (PFS_host *pfs_host)
	Build cache of SESSION status variables for a host. More...

int	materialize_account (PFS_account *pfs_account)
	Build cache of SESSION status variables for an account. More...

bool	is_materialized ()
	True if variables have been materialized. More...

bool	is_materialized (THD *unsafe_thd)
	True if variables have been materialized for given THD. More...

bool	is_materialized (PFS_thread *pfs_thread)
	True if variables have been materialized for given PFS_thread. More...

bool	is_materialized (PFS_user *pfs_user)
	True if variables have been materialized for given PFS_user. More...

bool	is_materialized (PFS_host *pfs_host)
	True if variables have been materialized for given PFS_host. More...

bool	is_materialized (PFS_account *pfs_account)
	True if variables have been materialized for given PFS_account. More...

bool	is_materialized (PFS_client *pfs_client)
	True if variables have been materialized for given PFS_user/host/account. More...

THD_ptr	get_THD (THD *thd)
	Get a validated THD from the thread manager. More...

THD_ptr	get_THD (PFS_thread *pfs_thread)

const System_variable *	get (uint index=0) const
	Get a single variable from the cache. More...

uint	size ()
	Number of elements in the cache. More...

Protected Member Functions
bool	init_show_var_array (enum_var_type scope, bool strict)
	Build a sorted list of all system variables from the system variable hash. More...

int	do_materialize_all (THD *thd) override
	Build a GLOBAL and SESSION system variable cache. More...

Private Member Functions
bool	do_initialize_session () override
	Build an array of SHOW_VARs from the system variable hash. More...

int	do_materialize_global () override
	Build a GLOBAL system variable cache. More...

int	do_materialize_session (THD *thd) override
	Build a SESSION system variable cache for a THD. More...

int	do_materialize_session (PFS_thread *thread) override
	Build a SESSION system variable cache for a pfs_thread. More...

int	do_materialize_session (PFS_thread *pfs_thread, uint index) override
	Materialize a single system variable for a pfs_thread. More...

void	set_mem_root ()
	Allocate and assign mem_root for system variable materialization. More...

void	clear_mem_root ()
	Mark memory blocks in the temporary mem_root as free. More...

void	free_mem_root ()
	Free the temporary mem_root. More...

Private Attributes
MEM_ROOT	m_mem_sysvar

MEM_ROOT **	m_mem_thd

MEM_ROOT *	m_mem_thd_save

MEM_ROOT *	m_mem_sysvar_ptr

Additional Inherited Members
Public Types inherited from PFS_variable_cache< System_variable >
typedef Prealloced_array< System_variable, SYSTEM_VARIABLE_PREALLOC >	Variable_array

Protected Attributes inherited from PFS_variable_cache< System_variable >
THD *	m_safe_thd

THD *	m_unsafe_thd

THD *	m_current_thd

PFS_thread *	m_pfs_thread

PFS_client *	m_pfs_client

Find_THD_variable	m_thd_finder

Variable_array	m_cache

bool	m_initialized

bool	m_external_init

bool	m_materialized

Show_var_array	m_show_var_array

System_variable_tracker::Array	m_sys_var_tracker_array

ulonglong	m_version

enum_var_type	m_query_scope

bool	m_use_mem_root

bool	m_aggregate

Detailed Description

System variable cache.

Constructor & Destructor Documentation

◆ PFS_system_variable_cache()

PFS_system_variable_cache::PFS_system_variable_cache ( bool external_init )

explicit

◆ ~PFS_system_variable_cache()

PFS_system_variable_cache::~PFS_system_variable_cache ( )

inlineoverride

Member Function Documentation

◆ clear_mem_root()

void PFS_system_variable_cache::clear_mem_root ( )

private

Mark memory blocks in the temporary mem_root as free.

Restore THD::mem_root.

◆ do_initialize_session()

bool PFS_system_variable_cache::do_initialize_session ( )

overrideprivatevirtual

Build an array of SHOW_VARs from the system variable hash.

Filter for SESSION scope.

Reimplemented from PFS_variable_cache< System_variable >.

◆ do_materialize_all()

int PFS_system_variable_cache::do_materialize_all ( THD * thd )

overrideprotectedvirtual

Build a GLOBAL and SESSION system variable cache.

Reimplemented from PFS_variable_cache< System_variable >.

Reimplemented in PFS_system_variable_info_cache, and PFS_system_persisted_variables_cache.

◆ do_materialize_global()

int PFS_system_variable_cache::do_materialize_global ( )

overrideprivatevirtual

Build a GLOBAL system variable cache.

Reimplemented from PFS_variable_cache< System_variable >.

◆ do_materialize_session() [1/3]

int PFS_system_variable_cache::do_materialize_session	(	PFS_thread *	pfs_thread,
		uint	index
	)

overrideprivatevirtual

Materialize a single system variable for a pfs_thread.

Requires that init_show_var_array() has already been called. Return 0 for success.

Reimplemented from PFS_variable_cache< System_variable >.

◆ do_materialize_session() [2/3]

int PFS_system_variable_cache::do_materialize_session ( PFS_thread * pfs_thread )

overrideprivatevirtual

Build a SESSION system variable cache for a pfs_thread.

Requires that init_show_var_array() has already been called. Return 0 for success.

Reimplemented from PFS_variable_cache< System_variable >.

◆ do_materialize_session() [3/3]

int PFS_system_variable_cache::do_materialize_session ( THD * thd )

overrideprivatevirtual

Build a SESSION system variable cache for a THD.

Reimplemented from PFS_variable_cache< System_variable >.

◆ free_mem_root()

void PFS_system_variable_cache::free_mem_root ( )

private

Free the temporary mem_root.

Restore THD::mem_root if necessary.

◆ get_sysvar_hash_version()

ulonglong PFS_system_variable_cache::get_sysvar_hash_version ( )

inline

◆ init_show_var_array()

bool PFS_system_variable_cache::init_show_var_array	(	enum_var_type	scope,
		bool	strict
	)

protected

Build a sorted list of all system variables from the system variable hash.

Filter by scope. Must be called inside of LOCK_plugin_delete.

◆ match_scope()

bool PFS_system_variable_cache::match_scope ( int scope )

Match system variable scope to desired scope.

◆ set_mem_root()

void PFS_system_variable_cache::set_mem_root ( )

private

Allocate and assign mem_root for system variable materialization.

Member Data Documentation

◆ m_mem_sysvar

MEM_ROOT PFS_system_variable_cache::m_mem_sysvar

private

◆ m_mem_sysvar_ptr

MEM_ROOT* PFS_system_variable_cache::m_mem_sysvar_ptr

private

◆ m_mem_thd

MEM_ROOT** PFS_system_variable_cache::m_mem_thd

private

◆ m_mem_thd_save

MEM_ROOT* PFS_system_variable_cache::m_mem_thd_save

private

The documentation for this class was generated from the following files:

storage/perfschema/pfs_variable.h
storage/perfschema/pfs_variable.cc

Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ PFS_system_variable_cache()

◆ ~PFS_system_variable_cache()

Member Function Documentation

◆ clear_mem_root()

◆ do_initialize_session()

◆ do_materialize_all()

◆ do_materialize_global()

◆ do_materialize_session() [1/3]

◆ do_materialize_session() [2/3]

◆ do_materialize_session() [3/3]

◆ free_mem_root()

◆ get_sysvar_hash_version()

◆ init_show_var_array()

◆ match_scope()

◆ set_mem_root()

Member Data Documentation

◆ m_mem_sysvar

◆ m_mem_sysvar_ptr

◆ m_mem_thd

◆ m_mem_thd_save