Package com.codahale.metrics

Class DerivativeGauge<F,T>

java.lang.Object

com.codahale.metrics.DerivativeGauge<F,T>

Type Parameters:

F - the base gauge's value type

T - the derivative type

All Implemented Interfaces:

Gauge<T>, Metric

public abstract class DerivativeGauge<F,T>
extends Object
implements Gauge<T>

A gauge whose value is derived from the value of another gauge.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DerivativeGauge(Gauge<F> base)	Creates a new derivative with the given base gauge.

Method Summary

Modifier and Type	Method	Description
T	getValue()	Returns the metric's current value.
protected abstract T	transform(F value)	Transforms the value of the base gauge to the value of this gauge.

Methods inherited from class java.lang.Object

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

Constructor Detail

DerivativeGauge

protected DerivativeGauge(Gauge<F> base)

Creates a new derivative with the given base gauge.

Parameters:

base - the gauge from which to derive this gauge's value

Method Detail

getValue

public T getValue()

Description copied from interface: Gauge

Returns the metric's current value.

Specified by:

getValue in interface Gauge<F>

Returns:

the metric's current value

transform

protected abstract T transform(F value)

Transforms the value of the base gauge to the value of this gauge.

Parameters:

value - the value of the base gauge

Returns:

this gauge's value