mysql::scheduler::Statistics_instance_monitor Class Reference

CSA statistics monitor, gathers statistics coming from different CSA threads Each statistic is a pair of key (statistic string) and value. More...

#include <statistics_instance_monitor.h>

Public Types
using	Mutex = concurrency::Mutex
using	Mutex_key = concurrency::Mutex_key

Public Member Functions
void	init ()
template<Statistic_allowed_type Type = long long>
void	register_stat (const std::string &name, std::size_t thread_num=1, bool enable=true)
	Get statistic value. More...
template<Statistic_allowed_type Type = long long>
std::optional< std::reference_wrapper< typename Statistic_type_traits< Type >::type > >	find_stat (const std::string &name)
	Get accumulated statistic value. More...
template<Statistic_allowed_type Type = long long>
Statistic_type_traits< Type >::type &	get_stat (const std::string &name)
	Get accumulated statistic value w/o bound checking. More...
void	reset ()
	Resets initialized statistics, use wisely. More...
void	clear ()
	Frees registered statistics storage for this instance. More...
	Statistics_instance_monitor ()=default

Protected Types
using	Registry_type = std::unordered_map< std::string, Sharded_counter >

Protected Attributes
Registry_type	m_registry

Detailed Description

CSA statistics monitor, gathers statistics coming from different CSA threads Each statistic is a pair of key (statistic string) and value.

This will help with backward and forward compatibility of statistics implemented in CSA servis w.r.t. statistics supported in the server Statistic update method ingests thread id, to keep a sharded statistics value until coalescing operation requested by external thread to get accumulated value (if coalescing is requested during "get" operation). For the time being, we assume only 1 channel

Member Typedef Documentation

Mutex

using mysql::scheduler::Statistics_instance_monitor::Mutex = concurrency::Mutex

Mutex_key

using mysql::scheduler::Statistics_instance_monitor::Mutex_key = concurrency::Mutex_key

Registry_type

using mysql::scheduler::Statistics_instance_monitor::Registry_type = std::unordered_map<std::string, Sharded_counter>

protected

Constructor & Destructor Documentation

Statistics_instance_monitor()

mysql::scheduler::Statistics_instance_monitor::Statistics_instance_monitor ( )

default

Member Function Documentation

clear()

void mysql::scheduler::Statistics_instance_monitor::clear

(

)

Frees registered statistics storage for this instance.

find_stat()

template<Statistic_allowed_type Type>

std::optional< std::reference_wrapper< typename Statistic_type_traits< Type >::type > > mysql::scheduler::Statistics_instance_monitor::find_stat

(

const std::string &

name

)

Get accumulated statistic value.

Parameters

name	Name of statistic

Returns

Value if statistic is found, no value otherwise

get_stat()

template<Statistic_allowed_type Type>

Statistic_type_traits< Type >::type & mysql::scheduler::Statistics_instance_monitor::get_stat

(

const std::string &

name

)

Get accumulated statistic value w/o bound checking.

Parameters

name	Name of statistic

Returns

Value if statistic is found, no value otherwise w/o bound checking

init()

void mysql::scheduler::Statistics_instance_monitor::init

(

)

register_stat()

template<Statistic_allowed_type Type>

void mysql::scheduler::Statistics_instance_monitor::register_stat	(	const std::string &	name,
		std::size_t	thread_num = 1,
		bool	enable = true
	)

Get statistic value.

Parameters

name	Name of statistic
thread_num	The number of threads accessing statistic
enable	Information on whether to enable this particular statistic

reset()

void mysql::scheduler::Statistics_instance_monitor::reset

(

)

Resets initialized statistics, use wisely.

Member Data Documentation

m_registry

Registry_type mysql::scheduler::Statistics_instance_monitor::m_registry

protected

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

• libs/mysql/scheduler/statistics_instance_monitor.h
• libs/mysql/scheduler/statistics_instance_monitor.cpp
• libs/mysql/scheduler/statistics_instance_monitor_impl.hpp