org.apache.storm.metric.internal

Class RateTracker

java.lang.Object

org.apache.storm.metric.internal.RateTracker

All Implemented Interfaces:

Closeable, AutoCloseable

public class RateTracker
extends Object
implements Closeable

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

Constructor Summary

Constructors

Constructor and Description
RateTracker(int validTimeWindowInMils, int numBuckets) Constructor.

Method Summary

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

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)

Constructor.

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()

Get report rate.

Returns:

the approximate average rate per second.

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable