org.apache.storm.metric.internal

Class RateTracker

java.lang.Object

org.apache.storm.metric.internal.RateTracker

public class RateTracker
extends Object

This class is a utility to track the rate of something.

Constructor Summary

Constructors

Constructor and Description
RateTracker(int validTimeWindowInMils, int numBuckets)

Method Summary

Modifier and Type	Method and Description
void	close()
void	notify(long count) Notify the tracker upon new arrivals
double	reportRate()

Methods inherited from class java.lang.Object

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

Constructor Detail

RateTracker

public RateTracker(int validTimeWindowInMils,
                   int numBuckets)

Parameters:

validTimeWindowInMils - events that happened before validTimeWindowInMils are not considered when reporting the rate.

numBuckets - the number of time sildes to divide validTimeWindows. The more buckets, the smother the reported results will be.

Method Detail

notify

public void notify(long count)

Notify the tracker upon new arrivals

Parameters:

count - number of arrivals

reportRate

public double reportRate()

Returns:

the approximate average rate per second.

close

public void close()