org.deegree.framework.util
Class ObjectPool

java.lang.Object
  java.util.TimerTask
      org.deegree.framework.util.ObjectPool

All Implemented Interfaces:

Runnable

Direct Known Subclasses:

DBPool, SDEPool

public abstract class ObjectPool
extends TimerTask

class to manage the object pool. this is part of the combination of the object pool pattern an the singelton pattern.

Version:

$Revision: 20107 $, $Revision: 20107 $, $Date: 2009-10-13 13:15:16 +0200 (Di, 13. Okt 2009) $

Author:

Andreas Poth, last edited by: $Author: aschmitz $

Field Summary

protected List<Object>	available all available objects
protected int	existingInstances number of existing instances
protected List<Object>	in_use all objects in use
protected Map<Object,Long>	startLifeTime the start life time for each object
protected Map<Object,Long>	startUsageTime the start usage time for each object

Constructor Summary

protected

ObjectPool() Creates a new ObjectPool object.

Method Summary

void	clear() clears the complete pool. objects in used while the clear() method has been called won't be put back to the pool if released back through the releaseObject method.
static ObjectPool	getInstance() dummy
int	getMaxInstances()
int	getMaxLifeTime()
int	getMaxUsageTime()
int	getUpdateInterval()
abstract void	onObjectKill(Object o) this method will be called when the submitted object will be removed from the pool
void	releaseObject(Object object) release an object back to the pool so it is available for other requests.
void	run()
void	setMaxInstances(int maxInstances)
void	setMaxLifeTime(int maxLifeTime)
void	setMaxUsageTime(int maxUsageTime)
void	setUpdateInterval(int updateInterval)
String	toString()

Methods inherited from class java.util.TimerTask

cancel, scheduledExecutionTime

Methods inherited from class java.lang.Object

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

Field Detail

available

protected List<Object> available

all available objects

in_use

protected List<Object> in_use

all objects in use

startLifeTime

protected Map<Object,Long> startLifeTime

the start life time for each object

startUsageTime

protected Map<Object,Long> startUsageTime

the start usage time for each object

existingInstances

protected int existingInstances

number of existing instances

Constructor Detail

ObjectPool

protected ObjectPool()

Creates a new ObjectPool object.

Method Detail

getInstance

public static ObjectPool getInstance()

dummy

Returns:

null

clear

public void clear()

clears the complete pool. objects in used while the clear() method has been called won't be put back to the pool if released back through the releaseObject method.

releaseObject

public void releaseObject(Object object)
                   throws Exception

release an object back to the pool so it is available for other requests.

Parameters:

object -

Throws:

Exception

onObjectKill

public abstract void onObjectKill(Object o)

this method will be called when the submitted object will be removed from the pool

Parameters:

o -

getMaxLifeTime

public int getMaxLifeTime()

Returns:

the max life time

setMaxLifeTime

public void setMaxLifeTime(int maxLifeTime)

Parameters:

maxLifeTime -

getMaxUsageTime

public int getMaxUsageTime()

Returns:

the max usage time

setMaxUsageTime

public void setMaxUsageTime(int maxUsageTime)

Parameters:

maxUsageTime -

getUpdateInterval

public int getUpdateInterval()

Returns:

the update interval

setUpdateInterval

public void setUpdateInterval(int updateInterval)

Parameters:

updateInterval -

getMaxInstances

public int getMaxInstances()

Returns:

max instances

setMaxInstances

public void setMaxInstances(int maxInstances)

Parameters:

maxInstances -

toString

public String toString()

Overrides:

toString in class Object

run

public void run()

Specified by:

run in interface Runnable

Specified by:

run in class TimerTask