org.eclipse.jetty.util.statistic

Class RateStatistic

java.lang.Object

org.eclipse.jetty.util.statistic.RateStatistic

public class RateStatistic
extends Object

Statistics on a time sequence rate.

Calculates the rate at which the record() method is called over the configured period, retaining also the total count and maximum rate achieved.

The implementation keeps a Deque of timestamps for all records for the last time period, so this method is not suitable for large rates unless a small time period is used.

Constructor Summary

Constructors

Constructor and Description
RateStatistic(long period, TimeUnit units)

Method Summary

Modifier and Type	Method and Description
protected void	age(long period, TimeUnit units)
String	dump()
String	dump(TimeUnit units)
long	getCount()
long	getMax()
long	getOldest(TimeUnit units)
long	getPeriod()
int	getRate()
TimeUnit	getUnits()
int	record() Records a sample value.
void	reset() Resets the statistics.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

RateStatistic

public RateStatistic(long period,
                     TimeUnit units)

Method Detail

getPeriod

public long getPeriod()

getUnits

public TimeUnit getUnits()

reset

public void reset()

Resets the statistics.

age

protected void age(long period,
                   TimeUnit units)

record

public int record()

Records a sample value.

Returns:

the number of records in the current period.

getRate

public int getRate()

Returns:

the number of records in the current period

getMax

public long getMax()

Returns:

the max number of samples per period.

getOldest

public long getOldest(TimeUnit units)

Parameters:

units - the units of the return

Returns:

the age of the oldest sample in the requested units

getCount

public long getCount()

Returns:

the number of samples recorded

dump

public String dump()

dump

public String dump(TimeUnit units)

toString

public String toString()

Overrides:

toString in class Object