Session_tracker Class Reference

#include <session_tracker.h>

Public Member Functions
	Session_tracker (Session_tracker const &)=delete
Session_tracker &	operator= (Session_tracker const &)=delete
	Session_tracker ()=default
	Constructor. More...
	~Session_tracker ()=default
	Destructor. More...
void	init (const CHARSET_INFO *char_set)
	Initialize Session_tracker objects and enable them based on the tracker_xxx variables' value that the session inherit from global variables at the time of session initialization (see plugin_thdvar_init). More...
void	enable (THD *thd)
	Enables the tracker objects. More...
bool	server_boot_verify (const CHARSET_INFO *char_set, LEX_STRING var_list)
	Method called during the server startup to verify the contents of @session_track_system_variables. More...
State_tracker *	get_tracker (enum_session_tracker tracker) const
	Returns the pointer to the tracker object for the specified tracker. More...
bool	enabled_any ()
	Checks if m_enabled flag is set for any of the tracker objects. More...
bool	changed_any ()
	Checks if m_changed flag is set for any of the tracker objects. More...
void	store (THD *thd, String &main_buf)
	Stores the session state change information of all changes session state type entities into the specified buffer. More...
void	deinit ()
void	claim_memory_ownership (bool claim)

Private Attributes
State_tracker *	m_trackers [SESSION_TRACKER_END+1]

Detailed Description

Session_tracker

This class holds an object each for all tracker classes and provides methods necessary for systematic detection and generation of session state change information.

Constructor & Destructor Documentation

Session_tracker() [1/2]

Session_tracker::Session_tracker ( Session_tracker const &  )

delete

Session_tracker() [2/2]

Session_tracker::Session_tracker ( )

default

Constructor.

~Session_tracker()

Session_tracker::~Session_tracker ( )

default

Destructor.

Member Function Documentation

changed_any()

bool Session_tracker::changed_any

(

)

Checks if m_changed flag is set for any of the tracker objects.

Returns

true At least one of the entities being tracker has changed. false None of the entities being tracked has changed.

claim_memory_ownership()

void Session_tracker::claim_memory_ownership

(

bool

claim

)

deinit()

void Session_tracker::deinit ( void  )

inline

enable()

void Session_tracker::enable

(

THD *

thd

)

Enables the tracker objects.

Parameters

thd	The thread handle.

enabled_any()

bool Session_tracker::enabled_any

(

)

Checks if m_enabled flag is set for any of the tracker objects.

Returns

true - At least one of the trackers is enabled. false - None of the trackers is enabled.

get_tracker()

State_tracker * Session_tracker::get_tracker

(

enum_session_tracker

tracker

)

const

Returns the pointer to the tracker object for the specified tracker.

Parameters

tracker

Tracker type.

Returns

Pointer to the tracker object.

init()

void Session_tracker::init

(

const CHARSET_INFO *

char_set

)

Initialize Session_tracker objects and enable them based on the tracker_xxx variables' value that the session inherit from global variables at the time of session initialization (see plugin_thdvar_init).

Initialize session tracker objects.

Parameters

char_set

The character set info.

operator=()

Session_tracker & Session_tracker::operator= ( Session_tracker const &  )

delete

server_boot_verify()

bool Session_tracker::server_boot_verify	(	const CHARSET_INFO *	char_set,
		LEX_STRING	var_list
	)

Method called during the server startup to verify the contents of @session_track_system_variables.

Parameters

char_set	The character set info.
var_list	Value of @session_track_system_variables.

Returns

false Success true failure

store()

void Session_tracker::store	(	THD *	thd,
		String &	buf
	)

Stores the session state change information of all changes session state type entities into the specified buffer.

Store all change information in the specified buffer.

Parameters

	thd	The thd handle.
[out]	buf	Reference to the string buffer to which the state change data needs to be written.

Member Data Documentation

m_trackers

State_tracker* Session_tracker::m_trackers[SESSION_TRACKER_END+1]

private

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

• sql/session_tracker.h
• sql/session_tracker.cc