#include <log_event.h>

Inheritance diagram for Format_description_log_event:

Collaboration diagram for Format_description_log_event:

Public Member Functions
	Format_description_log_event (uint8 binlog_ver, const char *server_ver=0)
	Format_description_log_event (const char buf, uint event_len, const Format_description_log_event description_event)
Log_event_type	get_type_code ()
bool	header_is_valid () const
bool	version_is_valid () const
bool	is_valid () const
int	get_data_size ()
void	calc_server_version_split ()
ulong	get_version_product () const
bool	is_version_before_checksum () const
Public Member Functions inherited from Start_log_event_v3
void	print (FILE file, PRINT_EVENT_INFO print_event_info)
	Start_log_event_v3 (const char buf, const Format_description_log_event description_event)
Public Member Functions inherited from Log_event
	Log_event (enum_event_cache_type cache_type_arg=EVENT_INVALID_CACHE, enum_event_logging_type logging_type_arg=EVENT_INVALID_LOGGING)
void	print_timestamp (IO_CACHE file, time_t ts)
void	print_header (IO_CACHE file, PRINT_EVENT_INFO print_event_info, bool is_more)
void	print_base64 (IO_CACHE file, PRINT_EVENT_INFO print_event_info, bool is_more)
bool	wrapper_my_b_safe_write (IO_CACHE file, const uchar buf, ulong data_length)
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 (const char buf, const Format_description_log_event description_event)
void	register_temp_buf (char *buf)
void	free_temp_buf ()
const char *	get_type_str ()

Public Attributes
uint8	common_header_len
uint8	number_of_event_types
uint8 *	post_header_len
uchar	server_version_split [3]
const uint8 *	event_type_permutation
Public Attributes inherited from Start_log_event_v3
time_t	created
uint16	binlog_version
char	server_version [ST_SERVER_VER_LEN]
bool	dont_set_created
Public Attributes inherited from Log_event
my_off_t	log_pos
char *	temp_buf
struct timeval	when
ulong	exec_time
ulong	data_written
uint32	server_id
uint32	unmasked_server_id
uint16	flags
ulong	slave_exec_mode
enum_event_cache_type	event_cache_type
enum_event_logging_type	event_logging_type
ha_checksum	crc
ulong	mts_group_idx
Relay_log_info *	worker
ulonglong	future_event_relay_log_pos
uint8	checksum_alg

Additional Inherited Members
Public Types inherited from Log_event
enum	enum_skip_reason { EVENT_SKIP_NOT, EVENT_SKIP_IGNORE, EVENT_SKIP_COUNT }
typedef unsigned char	Byte
Static Public Member Functions inherited from Log_event
static Log_event *	read_log_event (IO_CACHE file, const Format_description_log_event description_event, my_bool crc_check)
static void *	operator new (size_t size)
static void	operator delete (void *ptr, size_t)
static void *	operator new (size_t, void *ptr)
static void	operator delete (void , void )
static Log_event *	read_log_event (const char buf, uint event_len, const char error, const Format_description_log_event description_event, my_bool crc_check)
static const char *	get_type_str (Log_event_type type)
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 }

Detailed Description

For binlog version 4. This event is saved by threads which read it, as they need it for future use (to decode the ordinary events).

Binary Format

Definition at line 2647 of file log_event.h.

Constructor & Destructor Documentation

Format_description_log_event::Format_description_log_event	(	uint8	binlog_ver,
		const char *	server_ver = `0`
	)

Format_description_log_event 1st ctor.

Ctor. Can be used to create the event to write to the binary log (when the server starts or when FLUSH LOGS), or to create artificial events to parse binlogs from MySQL 3.23 or 4.x. When in a client, only the 2nd use is possible.

Parameters

binlog_version	the binlog version for which we want to build an event. Can be 1 (=MySQL 3.23), 3 (=4.0.x x>=2 and 4.1) or 4 (MySQL 5.0). Note that the old 4.0 (binlog version 2) is not supported; it should not be used for replication with 5.0.
server_ver	a string containing the server version.

Definition at line 5254 of file log_event.cc.

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Format_description_log_event::Format_description_log_event	(	const char *	buf,
		uint	event_len,
		const Format_description_log_event *	description_event
	)

The problem with this constructor is that the fixed header may have a length different from this version, but we don't know this length as we have not read the Format_description_log_event which says it, yet. This length is in the post-header of the event, but we don't know where the post-header starts.

So this type of event HAS to:

either have the header's length at the beginning (in the header, at a fixed position which will never be changed), not in the post-header. That would make the header be "shifted" compared to other events.
or have a header of size LOG_EVENT_MINIMAL_HEADER_LEN (19), in all future versions, so that we know for sure.

I (Guilhem) chose the 2nd solution. Rotate has the same constraint (because it is sent before Format_description_log_event).

Definition at line 5417 of file log_event.cc.

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