org.elasticsearch.common.metrics

クラス EWMA

java.lang.Object

org.elasticsearch.common.metrics.EWMA

public class EWMA
extends Object

An exponentially-weighted moving average.

Taken from codahale metric module, changed to use LongAdder

関連項目:

UNIX Load Average Part 1: How It Works, UNIX Load Average Part 2: Not Your Average Average

コンストラクタのサマリー

コンストラクタ

コンストラクタと説明
EWMA(double alpha, long interval, TimeUnit intervalUnit) Create a new EWMA with a specific smoothing constant.

メソッドのサマリー

修飾子とタイプ	メソッドと説明
static EWMA	fifteenMinuteEWMA() Creates a new EWMA which is equivalent to the UNIX fifteen minute load average and which expects to be ticked every 5 seconds.
static EWMA	fiveMinuteEWMA() Creates a new EWMA which is equivalent to the UNIX five minute load average and which expects to be ticked every 5 seconds.
static EWMA	oneMinuteEWMA() Creates a new EWMA which is equivalent to the UNIX one minute load average and which expects to be ticked every 5 seconds.
double	rate(TimeUnit rateUnit) Returns the rate in the given units of time.
void	tick() Mark the passage of time and decay the current rate accordingly.
void	update(long n) Update the moving average with a new value.

クラスから継承されたメソッド java.lang.Object

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

コンストラクタの詳細

EWMA

public EWMA(double alpha,
            long interval,
            TimeUnit intervalUnit)

Create a new EWMA with a specific smoothing constant.

パラメータ:

alpha - the smoothing constant

interval - the expected tick interval

intervalUnit - the time unit of the tick interval

メソッドの詳細

oneMinuteEWMA

public static EWMA oneMinuteEWMA()

Creates a new EWMA which is equivalent to the UNIX one minute load average and which expects to be ticked every 5 seconds.

戻り値:

a one-minute EWMA

fiveMinuteEWMA

public static EWMA fiveMinuteEWMA()

Creates a new EWMA which is equivalent to the UNIX five minute load average and which expects to be ticked every 5 seconds.

戻り値:

a five-minute EWMA

fifteenMinuteEWMA

public static EWMA fifteenMinuteEWMA()

Creates a new EWMA which is equivalent to the UNIX fifteen minute load average and which expects to be ticked every 5 seconds.

戻り値:

a fifteen-minute EWMA

update

public void update(long n)

Update the moving average with a new value.

パラメータ:

n - the new value

tick

public void tick()

Mark the passage of time and decay the current rate accordingly.

rate

public double rate(TimeUnit rateUnit)

Returns the rate in the given units of time.

パラメータ:

rateUnit - the unit of time

戻り値:

the rate