org.apache.java.recycle
Class MinMaxController

java.lang.Object
  |
  +--org.apache.java.recycle.MinMaxController

public class MinMaxController

extends java.lang.Object

implements Controller

This level controller is based on a simpler variance method: the variance of the request frequency is obtained from the difference between the minimum and maximum value of the level. The stability of the system is not much, but it consumes a lot lesser time resources that GaussianController.

Version:

$Revision: 1.3 $ $Date: 1999/06/24 00:50:50 $

Field Summary

private static int	BIAS This is the minimum value allowed to be reached.
private int	cursor The pointer in the circular array.
private int	level The current level.
private int[]	levels The array of levels.
private static int	WINDOW This is the log2 value of the sampling window.

Constructor Summary

MinMaxController()

Method Summary

void	down() Writes on the memory of this controller decrementing the level.
private int	getLevel(int[] array) Returns the predicted correct level calculating the max variable amplitude in levels statistics.
boolean	isThereRoomFor(Recyclable object) Evaluates the room for the object to recycle basing this decision to the optimum level estrapolated from the level history.
void	up() Writes on the memory of this controller incrementing the level.

Methods inherited from class java.lang.Object

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

Field Detail

WINDOW

private static final int WINDOW

This is the log2 value of the sampling window.

BIAS

private static final int BIAS

This is the minimum value allowed to be reached.

level

private int level

The current level.

levels

private int[] levels

The array of levels.

cursor

private int cursor

The pointer in the circular array.

Constructor Detail

MinMaxController

public MinMaxController()

Method Detail

up

public void up()

Writes on the memory of this controller incrementing the level.

Specified by:

up in interface Controller

down

public void down()

Writes on the memory of this controller decrementing the level.

Specified by:

down in interface Controller

isThereRoomFor

public boolean isThereRoomFor(Recyclable object)

Evaluates the room for the object to recycle basing this decision to the optimum level estrapolated from the level history.

Specified by:

isThereRoomFor in interface Controller

getLevel

private int getLevel(int[] array)

Returns the predicted correct level calculating the max variable amplitude in levels statistics.