com.pdd.pop.ext.codahale.metrics.DerivativeGauge Maven / Gradle / Ivy
package com.pdd.pop.ext.codahale.metrics;
/**
* A gauge whose value is derived from the value of another gauge.
*
* @param the base gauge's value type
* @param the derivative type
*/
public abstract class DerivativeGauge implements Gauge {
private final Gauge base;
/**
* Creates a new derivative with the given base gauge.
*
* @param base the gauge from which to derive this gauge's value
*/
protected DerivativeGauge(Gauge base) {
this.base = base;
}
@Override
public T getValue() {
return transform(base.getValue());
}
/**
* Transforms the value of the base gauge to the value of this gauge.
*
* @param value the value of the base gauge
* @return this gauge's value
*/
protected abstract T transform(F value);
}