org.jacorb.notification.util

Class AbstractObjectPool

public abstract class AbstractObjectPool extends Object implements Runnable, Configurable

Abstract Base Class for Simple Pooling Mechanism. Subclasses must at least implement the method newInstance. To use a Object call lendObject. After use the Object must be returned with returnObject(Object). An Object must not be used after it has been returned to its pool! This class needs a two phase initialization: configure MUST be invoked before an instance can be used.

Version: $Id: AbstractObjectPool.java,v 1.22 2006/06/14 11:57:54 alphonse.bendt Exp $

Author: Alphonse Bendt

Field Summary
protected Configuration	config_
static boolean	DEBUG
static int	INITIAL_SIZE_DEFAULT
protected Logger	logger_
static int	LOWER_WATERMARK_DEFAULT
static int	MAXIMUM_SIZE_DEFAULT
static int	MAXIMUM_WATERMARK_DEFAULT
static int	SIZE_INCREASE_DEFAULT
static long	SLEEP time the cleaner thread sleeps between two cleanups

Constructor Summary
protected	AbstractObjectPool(String name)
protected	AbstractObjectPool(String name, int lowerWatermark, int sizeincrease, int initialsize, int maxWatermark, int maximumSize)

Method Summary
void	configure(Configuration conf)
void	dispose() Release this Pool.
void	doActivateObject(Object o) Is called before Object is returned to Client (lendObject).
void	doDestroyObject(Object o) Is called if Pool is full and returned Object is discarded.
void	doPassivateObject(Object o) Is called after Object is returned to pool.
protected boolean	isCreationAllowed() check if it is allowed to create more instances.
Object	lendObject() lend an object from the pool.
abstract Object	newInstance() This method is called by the Pool to create a new Instance.
protected void	poolIsEmpty()
void	returnObject(Object o) return an Object to the pool.
void	run()
String	toString()