Session_state_change_tracker Class Reference

#include <session_tracker.h>

Inheritance diagram for Session_state_change_tracker:

Public Member Functions
	Session_state_change_tracker ()
	Constructor. More...
bool	enable (THD *thd) override
	Initiate the value of m_enabled based on @session_track_state_change value. More...
bool	check (THD *, set_var *) override
	To be invoked when the tracker's system variable is checked (ON_CHECK). More...
bool	update (THD *thd) override
	Enable/disable the tracker based on @session_track_state_change value. More...
bool	store (THD *, String &buf) override
	Store the 1byte boolean flag in the specified buffer. More...
void	mark_as_changed (THD *thd, LEX_CSTRING tracked_item_name) override
	Mark the tracker as changed and associated session attributes accordingly. More...
bool	is_state_changed ()
	find if there is a session state change More...
Public Member Functions inherited from State_tracker
	State_tracker ()
	Constructor. More...
virtual	~State_tracker ()=default
	Destructor. More...
bool	is_enabled () const
	Getters. More...
bool	is_changed () const
virtual void	claim_memory_ownership (bool claim)

Private Member Functions
void	reset ()
	Reset the m_changed flag for next statement. More...

Additional Inherited Members
Protected Attributes inherited from State_tracker
bool	m_enabled
	Is tracking enabled for a particular session state type ? More...
bool	m_changed
	Has the session state type changed ? More...

Constructor & Destructor Documentation

Session_state_change_tracker()

Session_state_change_tracker::Session_state_change_tracker

(

)

Constructor.

Member Function Documentation

check()

bool Session_state_change_tracker::check ( THD *  thd, set_var *  var  )

inlineoverridevirtual

To be invoked when the tracker's system variable is checked (ON_CHECK).

Implements State_tracker.

enable()

bool Session_state_change_tracker::enable ( THD *  thd )

overridevirtual

Initiate the value of m_enabled based on @session_track_state_change value.

Parameters

thd	The thd handle.

Returns

false (always)

Implements State_tracker.

is_state_changed()

bool Session_state_change_tracker::is_state_changed

(

)

find if there is a session state change

Returns

A session state change flag.

Return values

true	There is a session state change
false	There is no session state change

mark_as_changed()

void Session_state_change_tracker::mark_as_changed ( THD *  thd, LEX_CSTRING  tracked_item_name  )

overridevirtual

Mark the tracker as changed and associated session attributes accordingly.

Implements State_tracker.

reset()

void Session_state_change_tracker::reset ( void  )

private

Reset the m_changed flag for next statement.

store()

bool Session_state_change_tracker::store ( THD *  , String &  buf  )

overridevirtual

Store the 1byte boolean flag in the specified buffer.

Once the data is stored, we reset the flags related to state-change. If 1byte flag value is 1 then there is a session state change else there is no state change information.

Parameters

[in,out]

buf

Buffer to store the information to.

Returns

false Success true Error

Implements State_tracker.

update()

bool Session_state_change_tracker::update ( THD *  thd )

overridevirtual

Enable/disable the tracker based on @session_track_state_change value.

Parameters

thd	The thd handle.

Returns

false (always)

Implements State_tracker.

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

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