com.codahale.metrics

Class CachedGauge<T>

java.lang.Object

com.codahale.metrics.CachedGauge<T>

Type Parameters:

T - the type of the gauge's value

All Implemented Interfaces:

Gauge<T>, Metric

public abstract class CachedGauge<T>
extends Object
implements Gauge<T>

A Gauge implementation which caches its value for a period of time.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CachedGauge(Clock clock, long timeout, TimeUnit timeoutUnit) Creates a new cached gauge with the given clock and timeout period.
protected	CachedGauge(long timeout, TimeUnit timeoutUnit) Creates a new cached gauge with the given timeout period.

Method Summary

Modifier and Type	Method and Description
T	getValue() Returns the metric's current value.
protected abstract T	loadValue() Loads the value and returns it.

Methods inherited from class java.lang.Object

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

Constructor Detail

CachedGauge

protected CachedGauge(long timeout,
                      TimeUnit timeoutUnit)

Creates a new cached gauge with the given timeout period.

Parameters:

timeout - the timeout

timeoutUnit - the unit of timeout

CachedGauge

protected CachedGauge(Clock clock,
                      long timeout,
                      TimeUnit timeoutUnit)

Creates a new cached gauge with the given clock and timeout period.

Parameters:

clock - the clock used to calculate the timeout

timeout - the timeout

timeoutUnit - the unit of timeout

Method Detail

loadValue

protected abstract T loadValue()

Loads the value and returns it.

Returns:

the new value

getValue

public T getValue()

Description copied from interface: Gauge

Returns the metric's current value.

Specified by:

getValue in interface Gauge<T>

Returns:

the metric's current value