org.deegree_impl.enterprise
Class WFSGServicePool

java.lang.Object
  java.util.TimerTask
      org.deegree_impl.tools.ObjectPool
          org.deegree_impl.enterprise.WFSGServicePool

All Implemented Interfaces:

java.lang.Runnable

public class WFSGServicePool

extends ObjectPool

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

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Version:

07.02.2001

Author:

Andreas Poth

Field Summary

private GazetteerConfiguration	conf
private static WFSGServicePool	instance
private WFSGCapabilities	wfsgCapa

Fields inherited from class org.deegree_impl.tools.ObjectPool

available, existingInstances, in_use, startLifeTime, startUsageTime

Fields inherited from class java.util.TimerTask

Constructor Summary

private

WFSGServicePool(WFSGCapabilities wfsgCapa, GazetteerConfiguration conf)

Method Summary

java.lang.Object	acuireObject()
void	destroy()
void	fill(int noOfInstances) fill the pool with the submitted number of instances
static WFSGServicePool	getInstance(WFSGCapabilities wfsgCapa, GazetteerConfiguration conf) realize singelton pattern using double checked locking pattern.
void	onObjectKill(java.lang.Object o) this method will be called when the submitted object will be removed from the pool
java.lang.String	toString()

Methods inherited from class org.deegree_impl.tools.ObjectPool

clear, getInstance, getMaxInstances, getMaxLifeTime, getMaxUsageTime, getUpdateInterval, releaseObject, run, setMaxInstances, setMaxLifeTime, setMaxUsageTime, setUpdateInterval

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

instance

private static WFSGServicePool instance

wfsgCapa

private WFSGCapabilities wfsgCapa

conf

private GazetteerConfiguration conf

Constructor Detail

WFSGServicePool

private WFSGServicePool(WFSGCapabilities wfsgCapa,
                        GazetteerConfiguration conf)

Method Detail

getInstance

public static WFSGServicePool getInstance(WFSGCapabilities wfsgCapa,
                                          GazetteerConfiguration conf)

realize singelton pattern using double checked locking pattern.

Returns:

an instance of the object pool. it is gauranteed that there exists only one instance of pool for each submitted class name.

destroy

public void destroy()

acuireObject

public java.lang.Object acuireObject()
                              throws java.lang.Exception

Throws:

java.lang.Exception

fill

public void fill(int noOfInstances)

fill the pool with the submitted number of instances

onObjectKill

public void onObjectKill(java.lang.Object o)

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

Specified by:

onObjectKill in class ObjectPool

toString

public java.lang.String toString()

Overrides:

toString in class ObjectPool

Returns: