Package io.airlift.stats

Class ExponentialDecay

java.lang.Object

io.airlift.stats.ExponentialDecay

public final class ExponentialDecay
extends Object

Method Summary

Modifier and Type	Method	Description
static double	computeAlpha(double targetWeight, long targetAgeInSeconds)	Compute the alpha decay factor such that the weight of an entry with age 'targetAgeInSeconds' is targetWeight'
static double	fifteenMinutes()
static double	fiveMinutes()
static double	oneMinute()
static double	seconds(int seconds)
static double	weight(double alpha, long now, long landmark)	Compute the forward-decay multiplier (inverse of the decay factor)

Methods inherited from class java.lang.Object

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

Method Details

oneMinute

public static double oneMinute()

fiveMinutes

public static double fiveMinutes()

fifteenMinutes

public static double fifteenMinutes()

seconds

public static double seconds(int seconds)

computeAlpha

public static double computeAlpha(double targetWeight,
 long targetAgeInSeconds)

Compute the alpha decay factor such that the weight of an entry with age 'targetAgeInSeconds' is targetWeight'

weight

public static double weight(double alpha,
 long now,
 long landmark)

Compute the forward-decay multiplier (inverse of the decay factor)