org.mmbase.util

Class RandomPool

java.lang.Object

org.mmbase.util.RandomPool

public class RandomPool
extends Object

Class for holding a pool of random numbers. Calling stir(long) takes care of generating a new 'random' number. Calling value() returns the current random number.

Version:

$Id$

Author:

Rico Jansen, Pierre van Rooden (javadocs)

Constructor Summary

Constructors

Constructor and Description
RandomPool() Create a pool.
RandomPool(long init) Create a pool.

Method Summary

Modifier and Type	Method and Description
void	stir(long x) Maintain a pool of randomness using a modified 64-bit congruential generator with multipliers dynamically selected from a set of pseudo-random values.
long	value_and_stir() Stirs, then returns the (new) current random value.
long	value_and_stir(long mix) Stirs, then returns the (new) current random value.
long	value() Returns the current random value.

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomPool

public RandomPool()

Create a pool. Use the current time (long milliseconds) as a source of randomness

RandomPool

public RandomPool(long init)

Create a pool.

Parameters:

init - the source of randomness

Method Detail

stir

public void stir(long x)

Maintain a pool of randomness using a modified 64-bit congruential generator with multipliers dynamically selected from a set of pseudo-random values.

Parameters:

x - the source of randomness

value

public long value()

Returns the current random value.

value_and_stir

public long value_and_stir()

Stirs, then returns the (new) current random value. Use the current time (long milliseconds) as a source of randomness for stirring.

value_and_stir

public long value_and_stir(long mix)

Stirs, then returns the (new) current random value.

Parameters:

mix - the source of randomness for stirring