org.apache.slider.server.appmaster.management

Class LongGauge

java.lang.Object

java.lang.Number

java.util.concurrent.atomic.AtomicLong

org.apache.slider.server.appmaster.management.LongGauge

All Implemented Interfaces:

com.codahale.metrics.Gauge<Long>, com.codahale.metrics.Metric, Serializable

Direct Known Subclasses:

Timestamp

public class LongGauge
extends AtomicLong
implements com.codahale.metrics.Metric, com.codahale.metrics.Gauge<Long>

This is a AtomicLong which acts as a metrics gauge: its state can be exposed as a metrics. It also exposes some of the same method names as the Codahale Counter class, so that it's easy to swap in.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
LongGauge() Instantiate with value 0
LongGauge(long val) Instantiate

Method Summary

Methods

Modifier and Type	Method and Description
void	dec() --
long	decToFloor(long delta) Decrement to the floor of 0.
Long	getCount() Method from ; used here for drop-in replacement without any recompile
Long	getValue() Get the value as a metric
void	inc() ++

Methods inherited from class java.util.concurrent.atomic.AtomicLong

addAndGet, compareAndSet, decrementAndGet, doubleValue, floatValue, get, getAndAdd, getAndDecrement, getAndIncrement, getAndSet, incrementAndGet, intValue, lazySet, longValue, set, toString, weakCompareAndSet

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

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

Constructor Detail

LongGauge

public LongGauge(long val)

Instantiate

Parameters:

val - current value

LongGauge

public LongGauge()

Instantiate with value 0

Method Detail

getValue

public Long getValue()

Get the value as a metric

Specified by:

getValue in interface com.codahale.metrics.Gauge<Long>

Returns:

current value

getCount

public Long getCount()

Method from ; used here for drop-in replacement without any recompile

Returns:

current value

inc

public void inc()

++

dec

public void dec()

--

decToFloor

public long decToFloor(long delta)

Decrement to the floor of 0. Operations in parallel may cause confusion here, but it will still never go below zero

Parameters:

delta - delta

Returns:

the current value