com.emc.mongoose.api.metrics

Class UnsafeButFasterUniformReservoir

java.lang.Object

com.emc.mongoose.api.metrics.UnsafeButFasterUniformReservoir

All Implemented Interfaces:

com.codahale.metrics.Reservoir

public class UnsafeButFasterUniformReservoir
extends java.lang.Object
implements com.codahale.metrics.Reservoir

A random sampling reservoir of a stream of longs. Uses Vitter's Algorithm R to produce a statistically representative sample.

See Also:

Random Sampling with a Reservoir

Constructor Summary

Constructors

Constructor and Description
UnsafeButFasterUniformReservoir() Creates a new UniformReservoir of 1028 elements, which offers a 99.9% confidence level with a 5% margin of error assuming a normal distribution.
UnsafeButFasterUniformReservoir(int size) Creates a new UniformReservoir.

Method Summary

Modifier and Type	Method and Description
com.codahale.metrics.Snapshot	getSnapshot()
int	size()
void	update(long value)

Methods inherited from class java.lang.Object

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

Constructor Detail

UnsafeButFasterUniformReservoir

public UnsafeButFasterUniformReservoir()

Creates a new UniformReservoir of 1028 elements, which offers a 99.9% confidence level with a 5% margin of error assuming a normal distribution.

UnsafeButFasterUniformReservoir

public UnsafeButFasterUniformReservoir(int size)

Creates a new UniformReservoir.

Parameters:

size - the number of samples to keep in the sampling reservoir

Method Detail

size

public int size()

Specified by:

size in interface com.codahale.metrics.Reservoir

update

public void update(long value)

Specified by:

update in interface com.codahale.metrics.Reservoir

getSnapshot

public com.codahale.metrics.Snapshot getSnapshot()

Specified by:

getSnapshot in interface com.codahale.metrics.Reservoir