PSI_server_data_lock_container Class Reference

Server interface, row lock container. More...

#include <psi_data_lock.h>

Inheritance diagram for PSI_server_data_lock_container:

Public Member Functions
	PSI_server_data_lock_container ()=default
virtual	~PSI_server_data_lock_container ()=default
virtual const char *	cache_string (const char *string)=0
	Add a string to the container cache. More...
virtual const char *	cache_data (const char *ptr, size_t length)=0
	Add binary data to the container cache. More...
virtual void	cache_identifier (PSI_identifier kind, const char *str, size_t length, const char **cached_ptr, size_t *cached_length)=0
	Add an identifier in the container cache. More...
virtual bool	accept_engine (const char *engine, size_t engine_length)=0
	Check if the container accepts data for a particular engine. More...
virtual bool	accept_lock_id (const char *engine_lock_id, size_t engine_lock_id_length)=0
	Check if the container accepts data for a particular lock. More...
virtual bool	accept_transaction_id (ulonglong transaction_id)=0
	Check if the container accepts data for a particular transaction. More...
virtual bool	accept_thread_id_event_id (ulonglong thread_id, ulonglong event_id)=0
	Check if the container accepts data for a particular event. More...
virtual bool	accept_object (const char *table_schema, size_t table_schema_length, const char *table_name, size_t table_name_length, const char *partition_name, size_t partition_name_length, const char *sub_partition_name, size_t sub_partition_name_length)=0
	Check if the container accepts data for a particular object. More...
virtual void	add_lock_row (const char *engine, size_t engine_length, const char *engine_lock_id, size_t engine_lock_id_length, ulonglong transaction_id, ulonglong thread_id, ulonglong event_id, const char *table_schema, size_t table_schema_length, const char *table_name, size_t table_name_length, const char *partition_name, size_t partition_name_length, const char *sub_partition_name, size_t sub_partition_name_length, const char *index_name, size_t index_name_length, const void *identity, const char *lock_mode, const char *lock_type, const char *lock_status, const char *lock_data)=0
	Add a row to table performance_schema.data_locks. More...

Detailed Description

Server interface, row lock container.

This is the interface exposed

• by the server
• to the storage engines used to collect the data for table DATA_LOCKS. The server is to implement this interface. The storage engine is to call all_lock_row() to advertise row locks that exists within the storage engine tables.

Constructor & Destructor Documentation

PSI_server_data_lock_container()

PSI_server_data_lock_container::PSI_server_data_lock_container ( )

default

~PSI_server_data_lock_container()

virtual PSI_server_data_lock_container::~PSI_server_data_lock_container ( )

virtualdefault

Member Function Documentation

accept_engine()

virtual bool PSI_server_data_lock_container::accept_engine ( const char *  engine, size_t  engine_length  )

pure virtual

Check if the container accepts data for a particular engine.

This methods is used to prune data for queries like

SELECT * from performance_schema.data_locks WHERE ENGINE = ...

Implemented in PFS_data_lock_container.

accept_lock_id()

virtual bool PSI_server_data_lock_container::accept_lock_id ( const char *  engine_lock_id, size_t  engine_lock_id_length  )

pure virtual

Check if the container accepts data for a particular lock.

This methods is used to prune data for queries like

SELECT * from performance_schema.data_locks WHERE ENGINE_LOCK_ID = ...

Implemented in PFS_data_lock_container.

accept_object()

virtual bool PSI_server_data_lock_container::accept_object ( const char *  table_schema, size_t  table_schema_length, const char *  table_name, size_t  table_name_length, const char *  partition_name, size_t  partition_name_length, const char *  sub_partition_name, size_t  sub_partition_name_length  )

pure virtual

Check if the container accepts data for a particular object.

This methods is used to prune data for queries like

 SELECT * from performance_schema.data_locks
WHERE OBJECT_SCHEMA = ...
AND OBJECT_NAME = ...
AND PARTITION_NAME = ...
AND SUBPARTITION_NAME = ... 

Implemented in PFS_data_lock_container.

accept_thread_id_event_id()

virtual bool PSI_server_data_lock_container::accept_thread_id_event_id ( ulonglong  thread_id, ulonglong  event_id  )

pure virtual

Check if the container accepts data for a particular event.

This methods is used to prune data for queries like

 SELECT * from performance_schema.data_locks
WHERE THREAD_ID = ... AND EVENT_ID = ... 

Implemented in PFS_data_lock_container.

accept_transaction_id()

virtual bool PSI_server_data_lock_container::accept_transaction_id ( ulonglong  transaction_id )

pure virtual

Check if the container accepts data for a particular transaction.

This methods is used to prune data for queries like

 SELECT * from performance_schema.data_locks WHERE
ENGINE_TRANSACTION_ID = ... 

Implemented in PFS_data_lock_container.

add_lock_row()

virtual void PSI_server_data_lock_container::add_lock_row ( const char *  engine, size_t  engine_length, const char *  engine_lock_id, size_t  engine_lock_id_length, ulonglong  transaction_id, ulonglong  thread_id, ulonglong  event_id, const char *  table_schema, size_t  table_schema_length, const char *  table_name, size_t  table_name_length, const char *  partition_name, size_t  partition_name_length, const char *  sub_partition_name, size_t  sub_partition_name_length, const char *  index_name, size_t  index_name_length, const void *  identity, const char *  lock_mode, const char *  lock_type, const char *  lock_status, const char *  lock_data  )

pure virtual

Add a row to table performance_schema.data_locks.

Implemented in PFS_data_lock_container.

cache_data()

virtual const char * PSI_server_data_lock_container::cache_data ( const char *  ptr, size_t  length  )

pure virtual

Add binary data to the container cache.

See also

cache_string

Implemented in PFS_data_lock_container.

cache_identifier()

virtual void PSI_server_data_lock_container::cache_identifier ( PSI_identifier  kind, const char *  str, size_t  length, const char **  cached_ptr, size_t *  cached_length  )

pure virtual

Add an identifier in the container cache.

Depending on the identifier kind, the string given may be normalized, to comply with lower_case_table_names, before adding the string into the cache. Beware that the normalized string length may differ from the input string length.

Parameters

[in]	kind	Identifier kind, used for string normalization
[in]	str	Identifier input string
[in]	length	Identifier input string length
[out]	cached_ptr	Cached, possibly normalized, identifier string
[out]	cached_length	Cached identifier string length

Implemented in PFS_data_lock_container.

cache_string()

virtual const char * PSI_server_data_lock_container::cache_string ( const char *  string )

pure virtual

Add a string to the container cache.

Cached strings have the same life cycle as the data container, and are freed when the container is destroyed. Also, duplicated strings value are cached with the same copy, avoiding memory duplication. This is useful in particular to cache table schema or table names, which are duplicated a lot for different row locks on the same table.

Implemented in PFS_data_lock_container.

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

• include/mysql/psi/psi_data_lock.h