com.codahale.metrics

Class NoopMetricRegistry

java.lang.Object

com.codahale.metrics.MetricRegistry

com.codahale.metrics.NoopMetricRegistry

All Implemented Interfaces:

Metric, MetricSet

public final class NoopMetricRegistry
extends MetricRegistry

A registry of metric instances which never creates or registers any metrics and returns no-op implementations of any metric type.

Since:

4.1.17

Nested Class Summary

Nested classes/interfaces inherited from class com.codahale.metrics.MetricRegistry

MetricRegistry.MetricSupplier<T extends Metric>

Constructor Summary

Constructors

Constructor and Description
NoopMetricRegistry()

Method Summary

Modifier and Type	Method and Description
void	addListener(MetricRegistryListener listener) Adds a MetricRegistryListener to a collection of listeners that will be notified on metric creation.
protected ConcurrentMap<String,Metric>	buildMap() Creates a new ConcurrentMap implementation for use inside the registry.
Counter	counter(String name) Return the Counter registered under this name; or create and register a new Counter if none is registered.
Counter	counter(String name, MetricRegistry.MetricSupplier<Counter> supplier) Return the Counter registered under this name; or create and register a new Counter using the provided MetricSupplier if none is registered.
Gauge	gauge(String name, MetricRegistry.MetricSupplier<Gauge> supplier) Return the Gauge registered under this name; or create and register a new Gauge using the provided MetricSupplier if none is registered.
SortedMap<String,Counter>	getCounters() Returns a map of all the counters in the registry and their names.
SortedMap<String,Counter>	getCounters(MetricFilter filter) Returns a map of all the counters in the registry and their names which match the given filter.
SortedMap<String,Gauge>	getGauges() Returns a map of all the gauges in the registry and their names.
SortedMap<String,Gauge>	getGauges(MetricFilter filter) Returns a map of all the gauges in the registry and their names which match the given filter.
SortedMap<String,Histogram>	getHistograms() Returns a map of all the histograms in the registry and their names.
SortedMap<String,Histogram>	getHistograms(MetricFilter filter) Returns a map of all the histograms in the registry and their names which match the given filter.
SortedMap<String,Meter>	getMeters() Returns a map of all the meters in the registry and their names.
SortedMap<String,Meter>	getMeters(MetricFilter filter) Returns a map of all the meters in the registry and their names which match the given filter.
Map<String,Metric>	getMetrics() A map of metric names to metrics.
SortedSet<String>	getNames() Returns a set of the names of all the metrics in the registry.
SortedMap<String,Timer>	getTimers() Returns a map of all the timers in the registry and their names.
SortedMap<String,Timer>	getTimers(MetricFilter filter) Returns a map of all the timers in the registry and their names which match the given filter.
Histogram	histogram(String name) Return the Histogram registered under this name; or create and register a new Histogram if none is registered.
Histogram	histogram(String name, MetricRegistry.MetricSupplier<Histogram> supplier) Return the Histogram registered under this name; or create and register a new Histogram using the provided MetricSupplier if none is registered.
Meter	meter(String name) Return the Meter registered under this name; or create and register a new Meter if none is registered.
Meter	meter(String name, MetricRegistry.MetricSupplier<Meter> supplier) Return the Meter registered under this name; or create and register a new Meter using the provided MetricSupplier if none is registered.
<T extends Metric> T	register(String name, T metric) Given a Metric, registers it under the given name.
void	registerAll(MetricSet metrics) Given a metric set, registers them.
void	registerAll(String prefix, MetricSet metrics) Given a metric set, registers them with the given prefix prepended to their names.
boolean	remove(String name) Removes the metric with the given name.
void	removeListener(MetricRegistryListener listener) Removes a MetricRegistryListener from this registry's collection of listeners.
void	removeMatching(MetricFilter filter) Removes all metrics which match the given filter.
Timer	timer(String name) Return the Timer registered under this name; or create and register a new Timer if none is registered.
Timer	timer(String name, MetricRegistry.MetricSupplier<Timer> supplier) Return the Timer registered under this name; or create and register a new Timer using the provided MetricSupplier if none is registered.

Methods inherited from class com.codahale.metrics.MetricRegistry

name, name

Methods inherited from class java.lang.Object

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

Constructor Detail

NoopMetricRegistry

public NoopMetricRegistry()

Method Detail

buildMap

protected ConcurrentMap<String,Metric> buildMap()

Creates a new ConcurrentMap implementation for use inside the registry. Override this to create a MetricRegistry with space- or time-bounded metric lifecycles, for example.

Overrides:

buildMap in class MetricRegistry

Returns:

a new ConcurrentMap

register

public <T extends Metric> T register(String name,
                                     T metric)
                              throws IllegalArgumentException

Given a Metric, registers it under the given name.

Overrides:

register in class MetricRegistry

Type Parameters:

T - the type of the metric

Parameters:

name - the name of the metric

metric - the metric

Returns:

metric

Throws:

IllegalArgumentException - if the name is already registered or metric variable is null

registerAll

public void registerAll(MetricSet metrics)
                 throws IllegalArgumentException

Given a metric set, registers them.

Overrides:

registerAll in class MetricRegistry

Parameters:

metrics - a set of metrics

Throws:

IllegalArgumentException - if any of the names are already registered

counter

public Counter counter(String name)

Return the Counter registered under this name; or create and register a new Counter if none is registered.

Overrides:

counter in class MetricRegistry

Parameters:

name - the name of the metric

Returns:

a new or pre-existing Counter

counter

public Counter counter(String name,
                       MetricRegistry.MetricSupplier<Counter> supplier)

Return the Counter registered under this name; or create and register a new Counter using the provided MetricSupplier if none is registered.

Overrides:

counter in class MetricRegistry

Parameters:

name - the name of the metric

supplier - a MetricSupplier that can be used to manufacture a counter.

Returns:

a new or pre-existing Counter

histogram

public Histogram histogram(String name)

Return the Histogram registered under this name; or create and register a new Histogram if none is registered.

Overrides:

histogram in class MetricRegistry

Parameters:

name - the name of the metric

Returns:

a new or pre-existing Histogram

histogram

public Histogram histogram(String name,
                           MetricRegistry.MetricSupplier<Histogram> supplier)

Return the Histogram registered under this name; or create and register a new Histogram using the provided MetricSupplier if none is registered.

Overrides:

histogram in class MetricRegistry

Parameters:

name - the name of the metric

supplier - a MetricSupplier that can be used to manufacture a histogram

Returns:

a new or pre-existing Histogram

meter

public Meter meter(String name)

Return the Meter registered under this name; or create and register a new Meter if none is registered.

Overrides:

meter in class MetricRegistry

Parameters:

name - the name of the metric

Returns:

a new or pre-existing Meter

meter

public Meter meter(String name,
                   MetricRegistry.MetricSupplier<Meter> supplier)

Return the Meter registered under this name; or create and register a new Meter using the provided MetricSupplier if none is registered.

Overrides:

meter in class MetricRegistry

Parameters:

name - the name of the metric

supplier - a MetricSupplier that can be used to manufacture a Meter

Returns:

a new or pre-existing Meter

timer

public Timer timer(String name)

Return the Timer registered under this name; or create and register a new Timer if none is registered.

Overrides:

timer in class MetricRegistry

Parameters:

name - the name of the metric

Returns:

a new or pre-existing Timer

timer

public Timer timer(String name,
                   MetricRegistry.MetricSupplier<Timer> supplier)

Return the Timer registered under this name; or create and register a new Timer using the provided MetricSupplier if none is registered.

Overrides:

timer in class MetricRegistry

Parameters:

name - the name of the metric

supplier - a MetricSupplier that can be used to manufacture a Timer

Returns:

a new or pre-existing Timer

gauge

public Gauge gauge(String name,
                   MetricRegistry.MetricSupplier<Gauge> supplier)

Return the Gauge registered under this name; or create and register a new Gauge using the provided MetricSupplier if none is registered.

Overrides:

gauge in class MetricRegistry

Parameters:

name - the name of the metric

supplier - a MetricSupplier that can be used to manufacture a Gauge

Returns:

a new or pre-existing Gauge

remove

public boolean remove(String name)

Removes the metric with the given name.

Overrides:

remove in class MetricRegistry

Parameters:

name - the name of the metric

Returns:

whether or not the metric was removed

removeMatching

public void removeMatching(MetricFilter filter)

Removes all metrics which match the given filter.

Overrides:

removeMatching in class MetricRegistry

Parameters:

filter - a filter

addListener

public void addListener(MetricRegistryListener listener)

Adds a MetricRegistryListener to a collection of listeners that will be notified on metric creation. Listeners will be notified in the order in which they are added.

N.B.: The listener will be notified of all existing metrics when it first registers.

Overrides:

addListener in class MetricRegistry

Parameters:

listener - the listener that will be notified

removeListener

public void removeListener(MetricRegistryListener listener)

Removes a MetricRegistryListener from this registry's collection of listeners.

Overrides:

removeListener in class MetricRegistry

Parameters:

listener - the listener that will be removed

getNames

public SortedSet<String> getNames()

Returns a set of the names of all the metrics in the registry.

Overrides:

getNames in class MetricRegistry

Returns:

the names of all the metrics

getGauges

public SortedMap<String,Gauge> getGauges()

Returns a map of all the gauges in the registry and their names.

Overrides:

getGauges in class MetricRegistry

Returns:

all the gauges in the registry

getGauges

public SortedMap<String,Gauge> getGauges(MetricFilter filter)

Returns a map of all the gauges in the registry and their names which match the given filter.

Overrides:

getGauges in class MetricRegistry

Parameters:

filter - the metric filter to match

Returns:

all the gauges in the registry

getCounters

public SortedMap<String,Counter> getCounters()

Returns a map of all the counters in the registry and their names.

Overrides:

getCounters in class MetricRegistry

Returns:

all the counters in the registry

getCounters

public SortedMap<String,Counter> getCounters(MetricFilter filter)

Returns a map of all the counters in the registry and their names which match the given filter.

Overrides:

getCounters in class MetricRegistry

Parameters:

filter - the metric filter to match

Returns:

all the counters in the registry

getHistograms

public SortedMap<String,Histogram> getHistograms()

Returns a map of all the histograms in the registry and their names.

Overrides:

getHistograms in class MetricRegistry

Returns:

all the histograms in the registry

getHistograms

public SortedMap<String,Histogram> getHistograms(MetricFilter filter)

Returns a map of all the histograms in the registry and their names which match the given filter.

Overrides:

getHistograms in class MetricRegistry

Parameters:

filter - the metric filter to match

Returns:

all the histograms in the registry

getMeters

public SortedMap<String,Meter> getMeters()

Returns a map of all the meters in the registry and their names.

Overrides:

getMeters in class MetricRegistry

Returns:

all the meters in the registry

getMeters

public SortedMap<String,Meter> getMeters(MetricFilter filter)

Returns a map of all the meters in the registry and their names which match the given filter.

Overrides:

getMeters in class MetricRegistry

Parameters:

filter - the metric filter to match

Returns:

all the meters in the registry

getTimers

public SortedMap<String,Timer> getTimers()

Returns a map of all the timers in the registry and their names.

Overrides:

getTimers in class MetricRegistry

Returns:

all the timers in the registry

getTimers

public SortedMap<String,Timer> getTimers(MetricFilter filter)

Returns a map of all the timers in the registry and their names which match the given filter.

Overrides:

getTimers in class MetricRegistry

Parameters:

filter - the metric filter to match

Returns:

all the timers in the registry

registerAll

public void registerAll(String prefix,
                        MetricSet metrics)
                 throws IllegalArgumentException

Given a metric set, registers them with the given prefix prepended to their names.

Overrides:

registerAll in class MetricRegistry

Parameters:

prefix - a name prefix

metrics - a set of metrics

Throws:

IllegalArgumentException - if any of the names are already registered

getMetrics

public Map<String,Metric> getMetrics()

A map of metric names to metrics.

Specified by:

getMetrics in interface MetricSet

Overrides:

getMetrics in class MetricRegistry

Returns:

the metrics