org.LatencyUtils
Class MovingAverageIntervalEstimator

java.lang.Object
  org.LatencyUtils.IntervalEstimator
      org.LatencyUtils.MovingAverageIntervalEstimator

Direct Known Subclasses:

TimeCappedMovingAverageIntervalEstimator

public class MovingAverageIntervalEstimator
extends IntervalEstimator

A moving average interval estimator. Estimates intervals by averaging the interval values recorded in a moving window. Will only provide average estimate once enough intervals have been collected to fill the window, and will return an impossibly long interval estimate until then.

Field Summary

protected java.util.concurrent.atomic.AtomicLong	count
protected long[]	intervalEndTimes
protected int	windowLength
protected int	windowMagnitude
protected int	windowMask

Constructor Summary

MovingAverageIntervalEstimator(int requestedWindowLength)

Method Summary

protected int	getCurrentPosition()
long	getEstimatedInterval(long when) Provides the estimated interval
void	recordInterval(long when) Record an interval

Methods inherited from class java.lang.Object

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

Field Detail

intervalEndTimes

protected final long[] intervalEndTimes

windowMagnitude

protected final int windowMagnitude

windowLength

protected final int windowLength

windowMask

protected final int windowMask

count

protected java.util.concurrent.atomic.AtomicLong count

Constructor Detail

MovingAverageIntervalEstimator

public MovingAverageIntervalEstimator(int requestedWindowLength)

Parameters:

requestedWindowLength - The requested length of the moving window. May be rounded up to nearest power of 2.

Method Detail

recordInterval

public void recordInterval(long when)

Description copied from class: IntervalEstimator

Record an interval

Specified by:

recordInterval in class IntervalEstimator

Parameters:

when - the end time (in nanoTime units) at which the interval was observed.

getEstimatedInterval

public long getEstimatedInterval(long when)

Description copied from class: IntervalEstimator

Provides the estimated interval

Specified by:

getEstimatedInterval in class IntervalEstimator

Parameters:

when - the time (preferably now) at which the estimated interval is requested.

Returns:

estimated interval

getCurrentPosition

protected int getCurrentPosition()