org.carrot2.util
Class RollingWindowAverage

java.lang.Object
  org.carrot2.util.RollingWindowAverage

public class RollingWindowAverage
extends Object

Calculates an average of values showing up in a given time window. To keep processing efficient, bucketing is performed.

This class is not thread-safe.

Field Summary

static int	MILLIS Helpful constant for one millisecond.
static int	MINUTE Helpful constant for one minute.
static int	SECOND Helpful constant for one second.

Constructor Summary

RollingWindowAverage(long windowSizeMillis, long bucketSizeMillis)

Method Summary

void	add(long timestamp, long value) Adds a new entry.
double	getCurrentAverage()
long	getUpdatesInWindow() Returns the number of updates kept in the rolling window's scope.
long	getWindowSizeMillis() Returns the size of the rolling window.

Methods inherited from class java.lang.Object

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

Field Detail

MILLIS

public static final int MILLIS

Helpful constant for one millisecond.

See Also:

Constant Field Values

SECOND

public static final int SECOND

Helpful constant for one second.

See Also:

Constant Field Values

MINUTE

public static final int MINUTE

Helpful constant for one minute.

See Also:

Constant Field Values

Constructor Detail

RollingWindowAverage

public RollingWindowAverage(long windowSizeMillis,
                            long bucketSizeMillis)

Method Detail

add

public final void add(long timestamp,
                      long value)

Adds a new entry.

getCurrentAverage

public final double getCurrentAverage()

getUpdatesInWindow

public final long getUpdatesInWindow()

Returns the number of updates kept in the rolling window's scope.

getWindowSizeMillis

public final long getWindowSizeMillis()

Returns the size of the rolling window.