Rewriter Class Reference

Implementation of the post parse query rewriter. More...

#include <rewriter.h>

Public Member Functions
	Rewriter ()
int	get_number_loaded_rules () const
	The number of rules currently loaded in the hash table. More...
	~Rewriter ()
Rewrite_result	rewrite_query (MYSQL_THD thd, const uchar *key)
	Attempts to rewrite thd's current query with digest in 'key'. More...
longlong	refresh (MYSQL_THD thd)
	Empty the hashtable and reload all rules from disk table. More...
void	do_refresh (MYSQL_THD session_thd)
	Implementation of the loading procedure. More...

Private Member Functions
bool	load_rule (MYSQL_THD thd, Persisted_rule *diskrule)
	Loads the rule retrieved from the database in the hash table. More...

Private Attributes
longlong	m_refresh_status
malloc_unordered_multimap< std::string, std::unique_ptr< Rule > >	m_digests
	The in-memory rules hash table. More...

Detailed Description

Implementation of the post parse query rewriter.

The public interface consists of two operations: refresh(), which loads the rules from the disk table, and rewrite_query(), which rewrites a query if applicable.

Constructor & Destructor Documentation

Rewriter()

Rewriter::Rewriter ( )

default

~Rewriter()

Rewriter::~Rewriter ( )

default

Member Function Documentation

do_refresh()

void Rewriter::do_refresh

(

MYSQL_THD

session_thd

)

Implementation of the loading procedure.

The server doesn't handle different sessions in the same thread, so we load the rules into the hash table in this function, intended to be run in a new thread. The main thread will do join().

Parameters

session_thd

The session to be used for loading rules.

get_number_loaded_rules()

int Rewriter::get_number_loaded_rules ( ) const

inline

The number of rules currently loaded in the hash table.

In case of rules that fail to load, this number will be lower than the number of rows in the database.

load_rule()

bool Rewriter::load_rule ( MYSQL_THD  thd, Persisted_rule *  diskrule  )

private

Loads the rule retrieved from the database in the hash table.

refresh()

longlong Rewriter::refresh

(

MYSQL_THD

thd

)

Empty the hashtable and reload all rules from disk table.

rewrite_query()

Rewrite_result Rewriter::rewrite_query	(	MYSQL_THD	thd,
		const uchar *	key
	)

Attempts to rewrite thd's current query with digest in 'key'.

Returns

A Rewrite_result object.

Member Data Documentation

m_digests

malloc_unordered_multimap<std::string, std::unique_ptr<Rule> > Rewriter::m_digests

private

Initial value:

{
      PSI_INSTRUMENT_ME}

The in-memory rules hash table.

m_refresh_status

longlong Rewriter::m_refresh_status

private

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

• plugin/rewriter/rewriter.h
• plugin/rewriter/rewriter.cc