gate.util.spring.xml
Class PoolFiller

java.lang.Object
  gate.util.spring.xml.PoolFiller

All Implemented Interfaces:

org.springframework.beans.factory.InitializingBean

public class PoolFiller
extends Object
implements org.springframework.beans.factory.InitializingBean

Simple bean that takes a pooled target source and performs a sequence of n getTarget calls followed by n releaseTarget calls. This has the effect of pre-populating the pool with n instances up-front (normally a pooled target source only creates objects the first time they are required). Note that if the specified number of instances is greater than the maximum size of the pool the number of calls will be reduced accordingly.

Field Summary

private int	numInstances
private org.springframework.aop.target.AbstractPoolingTargetSource	targetSource

Constructor Summary

PoolFiller()

Method Summary

void	afterPropertiesSet()
private void	checkoutTargets(int num) Recursive helper method to check out num targets from the target source and then release them, with proper try/finally handling in case of exceptions.
void	setNumInstances(int numInstances) Set the number of nested get/release calls to make.
void	setTargetSource(org.springframework.aop.target.AbstractPoolingTargetSource targetSource) Set the target source to be populated.

Methods inherited from class java.lang.Object

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

Field Detail

targetSource

private org.springframework.aop.target.AbstractPoolingTargetSource targetSource

numInstances

private int numInstances

Constructor Detail

PoolFiller

public PoolFiller()

Method Detail

setTargetSource

public void setTargetSource(org.springframework.aop.target.AbstractPoolingTargetSource targetSource)

Set the target source to be populated.

setNumInstances

public void setNumInstances(int numInstances)

Set the number of nested get/release calls to make. The actual number of calls made is the minimum of this value and the maximum size of the pool.

afterPropertiesSet

public void afterPropertiesSet()
                        throws Exception

Specified by:

afterPropertiesSet in interface org.springframework.beans.factory.InitializingBean

Throws:

Exception

checkoutTargets

private void checkoutTargets(int num)
                      throws Exception

Recursive helper method to check out num targets from the target source and then release them, with proper try/finally handling in case of exceptions. If the target source is backed by a pool this will have the effect of forcing upfront creation of at least num instances in the pool.

Throws:

Exception