com.netflix.spectator.impl

Class SwapMeter<T extends Meter>

java.lang.Object

com.netflix.spectator.impl.SwapMeter<T>

All Implemented Interfaces:

Meter

public abstract class SwapMeter<T extends Meter>
extends Object
implements Meter

Base type for meters that allow the underlying implementation to be replaced with another. This is used by AbstractRegistry as the basis for expiring types where a user may have a reference in their code.

This class is an internal implementation detail only intended for use within spectator. It is subject to change without notice.

Field Summary

Fields

Modifier and Type	Field and Description
protected Id	id Id to use when performing a lookup after expiration.
protected Registry	registry Registry used to lookup values after expiration.

Constructor Summary

Constructors

Constructor and Description
SwapMeter(Registry registry, LongSupplier versionSupplier, Id id, T underlying) Create a new instance.

Method Summary

Modifier and Type	Method and Description
T	get() Return the underlying instance of the meter.
boolean	hasExpired() Indicates whether the meter is expired.
Id	id() Identifier used to lookup this meter in the registry.
abstract T	lookup() Lookup the meter from the registry.
Iterable<Measurement>	measure() Get the set of measurements for this meter.
void	set(T meter) Set the underlying instance of the meter to use.

Methods inherited from class java.lang.Object

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

Field Detail

registry

protected final Registry registry

Registry used to lookup values after expiration.

id

protected final Id id

Id to use when performing a lookup after expiration.

Constructor Detail

SwapMeter

public SwapMeter(Registry registry,
                 LongSupplier versionSupplier,
                 Id id,
                 T underlying)

Create a new instance.

Method Detail

lookup

public abstract T lookup()

Lookup the meter from the registry.

id

public Id id()

Description copied from interface: Meter

Identifier used to lookup this meter in the registry.

Specified by:

id in interface Meter

measure

public Iterable<Measurement> measure()

Description copied from interface: Meter

Get the set of measurements for this meter.

Specified by:

measure in interface Meter

hasExpired

public boolean hasExpired()

Description copied from interface: Meter

Indicates whether the meter is expired. For example, a counter might expire if there is no activity within a given time frame.

Specified by:

hasExpired in interface Meter

set

public void set(T meter)

Set the underlying instance of the meter to use. This can be set to null to indicate that the meter has expired and is no longer in the registry.

get

public T get()

Return the underlying instance of the meter.