Package org.apache.hadoop.hbase.metrics

Class MetricRegistries

java.lang.Object

org.apache.hadoop.hbase.metrics.MetricRegistries

Direct Known Subclasses:

MetricRegistriesImpl

@LimitedPrivate("Coprocesssor")
@Evolving
public abstract class MetricRegistries
extends Object

MetricRegistries is collection of MetricRegistry's. MetricsRegistries implementations should do ref-counting of MetricRegistry's via create() and remove() methods.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static final class	MetricRegistries.LazyHolder

Constructor Summary

Constructors

Constructor	Description
MetricRegistries()

Method Summary

Modifier and Type	Method	Description
abstract void	clear()	Removes all the MetricRegisties.
abstract MetricRegistry	create(MetricRegistryInfo info)	Create or return MetricRegistry with the given info.
abstract Optional<MetricRegistry>	get(MetricRegistryInfo info)	Returns the MetricRegistry if found.
abstract Collection<MetricRegistry>	getMetricRegistries()	Returns MetricRegistry's created.
abstract Set<MetricRegistryInfo>	getMetricRegistryInfos()	Returns MetricRegistryInfo's for the MetricRegistry's created.
static MetricRegistries	global()	Return the global singleton instance for the MetricRegistries.
abstract boolean	remove(MetricRegistryInfo key)	Decrements the ref count of the MetricRegistry, and removes if ref count == 0.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

MetricRegistries

public MetricRegistries()

Method Details

global

public static MetricRegistries global()

Return the global singleton instance for the MetricRegistries.

Returns:

MetricRegistries implementation.

clear

public abstract void clear()

Removes all the MetricRegisties.

create

public abstract MetricRegistry create(MetricRegistryInfo info)

Create or return MetricRegistry with the given info. MetricRegistry will only be created if current reference count is 0. Otherwise ref counted is incremented, and an existing instance will be returned.

Parameters:

info - the info object for the MetricRegistrytry.

Returns:

created or existing MetricRegistry.

remove

public abstract boolean remove(MetricRegistryInfo key)

Decrements the ref count of the MetricRegistry, and removes if ref count == 0.

Parameters:

key - the info object for the MetricRegistrytry.

Returns:

true if metric registry is removed.

get

public abstract Optional<MetricRegistry> get(MetricRegistryInfo info)

Returns the MetricRegistry if found.

Parameters:

info - the info for the registry.

Returns:

a MetricRegistry optional.

getMetricRegistryInfos

public abstract Set<MetricRegistryInfo> getMetricRegistryInfos()

Returns MetricRegistryInfo's for the MetricRegistry's created.

Returns:

MetricRegistryInfo's for the MetricRegistry's created.

getMetricRegistries

public abstract Collection<MetricRegistry> getMetricRegistries()

Returns MetricRegistry's created.

Returns:

MetricRegistry's created.