This is the subclass of Transaction_context_event and Log_event This class encodes the transaction_context_log_event. More...

#include <log_event.h>

Inheritance diagram for Transaction_context_log_event:

[legend]

Public Member Functions
	Transaction_context_log_event (const char *server_uuid_arg, bool using_trans, my_thread_id thread_id_arg, bool is_gtid_specified_arg)

	Transaction_context_log_event (const char buffer, const Format_description_event descr_event)

	~Transaction_context_log_event () override

void	claim_memory_ownership (bool claim) override
	Allow thread to CLAIM or DISCLAIM the ownership of this object depends on the parameter value passed. More...

size_t	get_data_size () override

size_t	get_event_length ()

int	pack_info (Protocol *protocol) override
	Stores a string representation of this event in the Protocol. More...

int	do_apply_event (Relay_log_info const *) override
	Primitive to apply an event to the database. More...

int	do_update_pos (Relay_log_info *rli) override
	Advance relay log coordinates. More...

void	add_write_set (const char *hash)
	Add a hash which identifies a inserted/updated/deleted row on the ongoing transaction. More...

std::list< const char * > *	get_write_set ()
	Return a pointer to write-set list. More...

void	add_read_set (const char *hash)
	Add a hash which identifies a read row on the ongoing transaction. More...

std::list< const char * > *	get_read_set ()
	Return a pointer to read-set list. More...

bool	read_snapshot_version ()
	Read snapshot version from encoded buffers. More...

Gtid_set *	get_snapshot_version ()
	Return the transaction snapshot timestamp. More...

const char *	get_server_uuid ()
	Return the server uuid. More...

my_thread_id	get_thread_id ()
	Return the id of the committing thread. More...

bool	is_gtid_specified ()
	Return true if transaction has GTID_NEXT specified, false otherwise. More...

Public Member Functions inherited from binary_log::Transaction_context_event
	Transaction_context_event (const char buf, const Format_description_event fde)
	Decodes the transaction_context_log_event of the ongoing transaction. More...

	Transaction_context_event (unsigned int thread_id_arg, bool is_gtid_specified_arg)

	~Transaction_context_event () override
	Destructor of the Transaction_context_event class. More...

Public Member Functions inherited from binary_log::Binary_log_event
virtual	~Binary_log_event ()=0

	Binary_log_event (const Binary_log_event &)=default

	Binary_log_event (Binary_log_event &&)=default

Binary_log_event &	operator= (const Binary_log_event &)=default

Binary_log_event &	operator= (Binary_log_event &&)=default

enum Log_event_type	get_event_type () const
	Helper method. More...

const Log_event_header *	header () const
	Return a const pointer to the header of the log event. More...

Log_event_header *	header ()
	Return a non-const pointer to the header of the log event. More...

const Log_event_footer *	footer () const
	Return a const pointer to the footer of the log event. More...

Log_event_footer *	footer ()
	Return a non-const pointer to the footer of the log event. More...

Event_reader &	reader ()
	Returns a reference to the event Event_reader object. More...

Public Member Functions inherited from Log_event
	Log_event (Log_event_header header, Log_event_footer footer, enum_event_cache_type cache_type_arg, enum_event_logging_type logging_type_arg)
	This minimal constructor is for when you are not even sure that there is a valid THD. More...

	Log_event (THD thd_arg, uint16 flags_arg, enum_event_cache_type cache_type_arg, enum_event_logging_type logging_type_arg, Log_event_header header, Log_event_footer *footer)

int	net_send (Protocol protocol, const char log_name, my_off_t pos)
	Only called by SHOW BINLOG EVENTS. More...

virtual const char *	get_db ()

void *	operator new (size_t size)

bool	wrapper_my_b_safe_write (Basic_ostream ostream, const uchar buf, size_t data_length)
	Write the given buffer to the given output stream, updating the checksum if checksums are enabled. More...

virtual bool	write (Basic_ostream *ostream)

time_t	get_time ()
	Prints a "session_var=value" string. More...

virtual Log_event_type	get_type_code () const

virtual bool	is_sbr_logging_format () const
	Return true if the event has to be logged using SBR for DMLs. More...

virtual bool	is_rbr_logging_format () const
	Return true if the event has to be logged using RBR for DMLs. More...

bool	is_valid ()

void	set_artificial_event ()

void	set_relay_log_event ()

bool	is_artificial_event () const

bool	is_relay_log_event () const

bool	is_ignorable_event () const

bool	is_no_filter_event () const

bool	is_using_trans_cache () const

bool	is_using_stmt_cache () const

bool	is_using_immediate_logging () const

	Log_event (Log_event_header header, Log_event_footer footer)

virtual	~Log_event ()

void	register_temp_buf (char *buf, bool free_in_destructor=true)

void	free_temp_buf ()

const char *	get_type_str () const
	Returns the human readable name of this event's type. More...

bool	is_mts_sequential_exec ()
	Is called from get_mts_execution_mode() to. More...

virtual uint8	get_mts_dbs (Mts_db_names arg, Rpl_filter rpl_filter)
	The method fills in pointers to event's database name c-strings to a supplied array. More...

bool	contains_partition_info (bool)

virtual uint8	mts_number_dbs ()

bool	is_mts_group_isolated ()

virtual bool	starts_group () const
	Events of a certain type can start or end a group of events treated transactionally wrt binlog. More...

virtual bool	ends_group () const

int	apply_event (Relay_log_info *rli)
	Apply the event to the database. More...

int	apply_gtid_event (Relay_log_info *rli)
	Apply the GTID event in curr_group_data to the database. More...

int	update_pos (Relay_log_info *rli)
	Update the relay log position. More...

enum_skip_reason	shall_skip (Relay_log_info *rli)
	Decide if the event shall be skipped, and the reason for skipping it. More...

virtual int	do_apply_event_worker (Slave_worker *w)

Private Member Functions
bool	write_data_header (Basic_ostream *ostream) override

bool	write_data_body (Basic_ostream *ostream) override

bool	write_snapshot_version (Basic_ostream *ostream)

bool	write_data_set (Basic_ostream ostream, std::list< const char > *set)

size_t	get_snapshot_version_size ()

size_t	to_string (char *buf, ulong len) const

Static Private Member Functions
static int	get_data_set_size (std::list< const char * > *set)

Private Attributes
Sid_map *	sid_map
	The Sid_map to use for creating the Gtid_set. More...

Gtid_set *	snapshot_version
	A gtid_set which is used to store the transaction set used for conflict detection. More...

Additional Inherited Members
Public Types inherited from binary_log::Binary_log_event
enum	enum_post_header_length { QUERY_HEADER_MINIMAL_LEN = (4 + 4 + 1 + 2) , QUERY_HEADER_LEN = (QUERY_HEADER_MINIMAL_LEN + 2) , STOP_HEADER_LEN = 0 , START_V3_HEADER_LEN = (2 + ST_SERVER_VER_LEN + 4) , ROTATE_HEADER_LEN = 8 , INTVAR_HEADER_LEN = 0 , APPEND_BLOCK_HEADER_LEN = 4 , DELETE_FILE_HEADER_LEN = 4 , RAND_HEADER_LEN = 0 , USER_VAR_HEADER_LEN = 0 , FORMAT_DESCRIPTION_HEADER_LEN = (START_V3_HEADER_LEN + 1 + LOG_EVENT_TYPES) , XID_HEADER_LEN = 0 , BEGIN_LOAD_QUERY_HEADER_LEN = APPEND_BLOCK_HEADER_LEN , ROWS_HEADER_LEN_V1 = 8 , TABLE_MAP_HEADER_LEN = 8 , EXECUTE_LOAD_QUERY_EXTRA_HEADER_LEN = (4 + 4 + 4 + 1) , EXECUTE_LOAD_QUERY_HEADER_LEN , INCIDENT_HEADER_LEN = 2 , HEARTBEAT_HEADER_LEN = 0 , IGNORABLE_HEADER_LEN = 0 , ROWS_HEADER_LEN_V2 = 10 , TRANSACTION_CONTEXT_HEADER_LEN = 18 , VIEW_CHANGE_HEADER_LEN = 52 , XA_PREPARE_HEADER_LEN = 0 , TRANSACTION_PAYLOAD_HEADER_LEN = 0 }
	The lengths for the fixed data part of each event. More...

Public Types inherited from Log_event
enum	enum_skip_reason { EVENT_SKIP_NOT , EVENT_SKIP_IGNORE , EVENT_SKIP_COUNT }
	Enumeration of what kinds of skipping (and non-skipping) that can occur when the slave executes an event. More...

Static Public Member Functions inherited from binary_log::Transaction_context_event
static const char *	read_data_set (const char pos, uint32_t set_len, std::list< const char > *set, uint32_t remaining_buffer)

static void	clear_set (std::list< const char * > *set)
	Function to clear the memory of the write_set and the read_set. More...

Static Public Member Functions inherited from Log_event
static void	init_show_field_list (mem_root_deque< Item * > *field_list)
	init_show_field_list() prepares the column names and types for the output of SHOW BINLOG EVENTS; it is used only by SHOW BINLOG EVENTS. More...

static void	operator delete (void *ptr, size_t)

static void *	operator new (size_t, void *ptr)

static void	operator delete (void , void )

static const char *	get_type_str (Log_event_type type)
	Returns the human readable name of the given event type. More...

static const char *	get_type_str (uint type)
	Get the name of an event type, or "Unknown" if out of range. More...

Public Attributes inherited from Log_event
char *	temp_buf

bool	m_free_temp_buf_in_destructor

ulong	exec_time

uint32	server_id

ulong	rbr_exec_mode
	A storage to cache the global system variable's value. More...

enum_event_cache_type	event_cache_type
	Defines the type of the cache, if any, where the event will be stored before being flushed to disk. More...

enum_event_logging_type	event_logging_type
	Defines when information, i.e. More...

ha_checksum	crc
	Placeholder for event checksum while writing to binlog. More...

ulong	mts_group_idx
	Index in `rli->gaq` array to indicate a group that this event is purging. More...

binary_log::Log_event_header *	common_header
	The Log_event_header class contains the variable present in the common header. More...

binary_log::Log_event_footer *	common_footer
	The Log_event_footer class contains the variable present in the common footer. More...

Relay_log_info *	worker
	MTS: associating the event with either an assigned Worker or Coordinator. More...

ulonglong	future_event_relay_log_pos
	A copy of the main rli value stored into event to pass to MTS worker rli. More...

THD *	thd

db_worker_hash_entry *	mts_assigned_partitions [MAX_DBS_IN_EVENT_MTS]
	Partition info associate with event to deliver to MTS event applier. More...

Static Public Attributes inherited from binary_log::Binary_log_event
static const int	LOG_EVENT_TYPES = (ENUM_END_EVENT - 1)

Protected Types inherited from Log_event
enum	enum_event_cache_type { EVENT_INVALID_CACHE = 0 , EVENT_STMT_CACHE , EVENT_TRANSACTIONAL_CACHE , EVENT_NO_CACHE , EVENT_CACHE_COUNT }

enum	enum_event_logging_type { EVENT_INVALID_LOGGING = 0 , EVENT_NORMAL_LOGGING , EVENT_IMMEDIATE_LOGGING , EVENT_CACHE_LOGGING_COUNT }

Protected Member Functions inherited from binary_log::Binary_log_event
	Binary_log_event (Log_event_type type_code)
	This constructor is used to initialize the type_code of header object m_header. More...

	Binary_log_event (const char *buf, const Format_description_event fde)
	This constructor will create a new object of Log_event_header and initialize the variable m_header, which in turn will be used to initialize Log_event's member common_header. More...

Protected Member Functions inherited from Log_event
uint32	write_header_to_memory (uchar *buf)
	Writes the common header of this event to the given memory buffer. More...

bool	write_header (Basic_ostream *ostream, size_t data_length)
	Writes the common-header of this event to the given output stream and updates the checksum. More...

bool	write_footer (Basic_ostream *ostream)

bool	need_checksum ()
	A decider of whether to trigger checksum computation or not. More...

enum_skip_reason	continue_group (Relay_log_info *rli)
	Helper function to ignore an event w.r.t. More...

virtual enum_skip_reason	do_shall_skip (Relay_log_info *rli)
	Decide if this event shall be skipped or not and the reason for skipping it. More...

Protected Attributes inherited from binary_log::Transaction_context_event
const char *	server_uuid

uint32_t	thread_id

bool	gtid_specified

const unsigned char *	encoded_snapshot_version

uint32_t	encoded_snapshot_version_length

std::list< const char * >	write_set

std::list< const char * >	read_set

Static Protected Attributes inherited from binary_log::Transaction_context_event
static const int	ENCODED_SERVER_UUID_LEN_OFFSET = 0

static const int	ENCODED_THREAD_ID_OFFSET = 1

static const int	ENCODED_GTID_SPECIFIED_OFFSET = 5

static const int	ENCODED_SNAPSHOT_VERSION_LEN_OFFSET = 6

static const int	ENCODED_WRITE_SET_ITEMS_OFFSET = 10

static const int	ENCODED_READ_SET_ITEMS_OFFSET = 14

static const int	ENCODED_READ_WRITE_SET_ITEM_LEN = 2

static const int	ENCODED_SNAPSHOT_VERSION_LEN = 2

Detailed Description

This is the subclass of Transaction_context_event and Log_event This class encodes the transaction_context_log_event.

Constructor & Destructor Documentation

◆ Transaction_context_log_event() [1/2]

Transaction_context_log_event::Transaction_context_log_event	(	const char *	server_uuid_arg,
		bool	using_trans,
		my_thread_id	thread_id_arg,
		bool	is_gtid_specified_arg
	)

◆ Transaction_context_log_event() [2/2]

Transaction_context_log_event::Transaction_context_log_event	(	const char *	buffer,
		const Format_description_event *	descr_event
	)

◆ ~Transaction_context_log_event()

Transaction_context_log_event::~Transaction_context_log_event ( )

override

Member Function Documentation

◆ add_read_set()

void Transaction_context_log_event::add_read_set ( const char * hash )

Add a hash which identifies a read row on the ongoing transaction.

Parameters

[in] hash row identifier

◆ add_write_set()

void Transaction_context_log_event::add_write_set ( const char * hash )

Add a hash which identifies a inserted/updated/deleted row on the ongoing transaction.

Parameters

[in] hash row identifier

◆ claim_memory_ownership()

void Transaction_context_log_event::claim_memory_ownership ( bool claim )

overridevirtual

Allow thread to CLAIM or DISCLAIM the ownership of this object depends on the parameter value passed.

Parameters

claim True - claim ownership of the memory False - disclaim ownership of the memory

Reimplemented from Log_event.

◆ do_apply_event()

int Transaction_context_log_event::do_apply_event ( Relay_log_info const * rli )

inlineoverridevirtual

Primitive to apply an event to the database.

This is where the change to the database is made.

Note: The primitive is protected instead of private, since there is a hierarchy of actions to be performed in some cases.

See also: Format_description_log_event::do_apply_event()

Parameters

rli	Pointer to relay log info structure

Return values

0	Event applied successfully
errno	Error code if event application failed

Reimplemented from Log_event.

◆ do_update_pos()

int Transaction_context_log_event::do_update_pos ( Relay_log_info * rli )

overridevirtual

Advance relay log coordinates.

This function is called to advance the relay log coordinates to just after the event. It is essential that both the relay log coordinate and the group log position is updated correctly, since this function is used also for skipping events.

Normally, each implementation of do_update_pos() shall:

Update the event position to refer to the position just after the event.
Update the group log position to refer to the position just after the event if the event is last in a group

Parameters

rli	Pointer to relay log info structure

Return values

0	Coordinates changed successfully
errno	Error code if advancing failed (usually just 1). Observe that handler errors are returned by the do_apply_event() function, and not by this one.

Reimplemented from Log_event.

◆ get_data_set_size()

int Transaction_context_log_event::get_data_set_size ( std::list< const char * > * set )

staticprivate

◆ get_data_size()

size_t Transaction_context_log_event::get_data_size ( )

overridevirtual

Reimplemented from Log_event.

◆ get_event_length()

size_t Transaction_context_log_event::get_event_length ( )

◆ get_read_set()

std::list< const char * > * Transaction_context_log_event::get_read_set ( )

inline

Return a pointer to read-set list.

◆ get_server_uuid()

const char * Transaction_context_log_event::get_server_uuid ( )

inline

Return the server uuid.

◆ get_snapshot_version()

Gtid_set * Transaction_context_log_event::get_snapshot_version ( )

inline

Return the transaction snapshot timestamp.

◆ get_snapshot_version_size()

size_t Transaction_context_log_event::get_snapshot_version_size ( )

private

◆ get_thread_id()

my_thread_id Transaction_context_log_event::get_thread_id ( )

inline

Return the id of the committing thread.

◆ get_write_set()

std::list< const char * > * Transaction_context_log_event::get_write_set ( )

inline

Return a pointer to write-set list.

◆ is_gtid_specified()

bool Transaction_context_log_event::is_gtid_specified ( )

inline

Return true if transaction has GTID_NEXT specified, false otherwise.

◆ pack_info()

int Transaction_context_log_event::pack_info ( Protocol * protocol )

overridevirtual

Stores a string representation of this event in the Protocol.

This is used by SHOW BINLOG EVENTS.

Return values

0	success
nonzero	error

Reimplemented from Log_event.

◆ read_snapshot_version()

bool Transaction_context_log_event::read_snapshot_version ( )

Read snapshot version from encoded buffers.

Cannot be executed during data read from file (event constructor), since its required locks will collide with the server gtid state initialization procedure.

◆ to_string()

size_t Transaction_context_log_event::to_string	(	char *	buf,
		ulong	len
	)		const

private

◆ write_data_body()

bool Transaction_context_log_event::write_data_body ( Basic_ostream * ostream )

overrideprivatevirtual

Reimplemented from Log_event.

◆ write_data_header()

bool Transaction_context_log_event::write_data_header ( Basic_ostream * ostream )

overrideprivatevirtual

Reimplemented from Log_event.

◆ write_data_set()

bool Transaction_context_log_event::write_data_set	(	Basic_ostream *	ostream,
		std::list< const char * > *	set
	)

private

◆ write_snapshot_version()

bool Transaction_context_log_event::write_snapshot_version ( Basic_ostream * ostream )

private

Member Data Documentation

◆ sid_map

Sid_map* Transaction_context_log_event::sid_map

private

The Sid_map to use for creating the Gtid_set.

◆ snapshot_version

Gtid_set* Transaction_context_log_event::snapshot_version

private

A gtid_set which is used to store the transaction set used for conflict detection.

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

sql/log_event.h
sql/log_event.cc

Public Member Functions

Private Member Functions

Static Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ Transaction_context_log_event() [1/2]

◆ Transaction_context_log_event() [2/2]

◆ ~Transaction_context_log_event()

Member Function Documentation

◆ add_read_set()

◆ add_write_set()

◆ claim_memory_ownership()

◆ do_apply_event()

◆ do_update_pos()

◆ get_data_set_size()

◆ get_data_size()

◆ get_event_length()

◆ get_read_set()

◆ get_server_uuid()

◆ get_snapshot_version()

◆ get_snapshot_version_size()

◆ get_thread_id()

◆ get_write_set()

◆ is_gtid_specified()

◆ pack_info()

◆ read_snapshot_version()

◆ to_string()

◆ write_data_body()

◆ write_data_header()

◆ write_data_set()

◆ write_snapshot_version()

Member Data Documentation

◆ sid_map

◆ snapshot_version