java.lang.Object
- com.codahale.metrics.EWMA

```
public class EWMA
extends java.lang.Object
```
An exponentially-weighted moving average.

See Also:

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

Field Summary

Fields
Modifier and Type	Field	Description
`private double`	`alpha`
`private static int`	`FIFTEEN_MINUTES`
`private static int`	`FIVE_MINUTES`
`private boolean`	`initialized`
`private double`	`interval`
`private static int`	`INTERVAL`
`private static double`	`M1_ALPHA`
`private static double`	`M15_ALPHA`
`private static double`	`M5_ALPHA`
`private static int`	`ONE_MINUTE`
`private double`	`rate`
`private static double`	`SECONDS_PER_MINUTE`
`private LongAdder`	`uncounted`

Constructor Summary

Constructors
Constructor Description

EWMA(double alpha, long interval, java.util.concurrent.TimeUnit intervalUnit)
Create a new EWMA with a specific smoothing constant.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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.
`double`	`getRate(java.util.concurrent.TimeUnit rateUnit)`	Returns the rate in the given units of time.
`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.
`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.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - INTERVAL
```
private static final int INTERVAL
```
    See Also:
    
    Constant Field Values
  - SECONDS_PER_MINUTE
```
private static final double SECONDS_PER_MINUTE
```
    See Also:
    
    Constant Field Values
  - ONE_MINUTE
```
private static final int ONE_MINUTE
```
    See Also:
    
    Constant Field Values
  - FIVE_MINUTES
```
private static final int FIVE_MINUTES
```
    See Also:
    
    Constant Field Values
  - FIFTEEN_MINUTES
```
private static final int FIFTEEN_MINUTES
```
    See Also:
    
    Constant Field Values
  - M1_ALPHA
```
private static final double M1_ALPHA
```
  - M5_ALPHA
```
private static final double M5_ALPHA
```
  - M15_ALPHA
```
private static final double M15_ALPHA
```
  - initialized
```
private volatile boolean initialized
```
  - rate
```
private volatile double rate
```
  - uncounted
```
private final LongAdder uncounted
```
  - alpha
```
private final double alpha
```
  - interval
```
private final double interval
```
- Constructor Detail
  - EWMA
```
public EWMA(double alpha,
            long interval,
            java.util.concurrent.TimeUnit intervalUnit)
```
    Create a new EWMA with a specific smoothing constant.
    
    Parameters:
    
    alpha - the smoothing constant
    
    interval - the expected tick interval
    
    intervalUnit - the time unit of the tick interval
- Method Detail
  - 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.
    
    Returns:
    
    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.
    
    Returns:
    
    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.
    
    Returns:
    
    a fifteen-minute EWMA
  - update
```
public void update(long n)
```
    Update the moving average with a new value.
    
    Parameters:
    
    n - the new value
  - tick
```
public void tick()
```
    Mark the passage of time and decay the current rate accordingly.
  - getRate
```
public double getRate(java.util.concurrent.TimeUnit rateUnit)
```
    Returns the rate in the given units of time.
    
    Parameters:
    
    rateUnit - the unit of time
    
    Returns:
    
    the rate

Class EWMA

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

INTERVAL

SECONDS_PER_MINUTE

ONE_MINUTE

FIVE_MINUTES

FIFTEEN_MINUTES

M1_ALPHA

M5_ALPHA

M15_ALPHA

initialized

rate

uncounted

alpha

interval

Constructor Detail

EWMA

Method Detail

oneMinuteEWMA

fiveMinuteEWMA

fifteenMinuteEWMA

update

tick

getRate