Initialization of CommonsPoolTargetSource

[FrenchFrog]

Hi
I want to have a pool of objects and instantiate them all when I deploy the application.

Here is the xml snippet where I declare the target bean, the pool and the proxy.

<bean id="myTargetBean" class="package.TargetBean" scope="prototype" lazy-init="false">
</bean>

<bean id="targetBeanPool" class="org.springframework.aop.target.CommonsPoolTargetSource" lazy-init="false">
  <property name="targetBeanName" value="myTargetBean" />
  <property name="minIdle" value="100" />
</bean>

<bean id="myPoolFactory" class="org.springframework.aop.framework.ProxyFactoryBean">
  <property name="targetSource" ref="targetBeanPool" />
</bean>

Below part of the code of the targetBean. Because I need some autowired stuff in the constructor, I used the @PostConstructor method

public class TargetBean {
  private Client client;

  @PostConstruct
  private void postConstructor(){
    //Some stuff

    log.debug("client instanciated : "+client);
  }

  public Client getClient() { return client; }
}

and ultimately, elsewhere in the code, I autowire the proxy to get the pooled objects.

@Autowired
TargetBean myPoolFactory;

Client client = myPoolFactory.getClient();

This code works fine except that only one TargetBean is created when I start the application. I though minIdle would have solved the problem but apparently not.
What did I miss ?
Thanks

[mary123]

This method allows the bean instance to perform initialization only possible . If this FactoryBean is not fully initialized yet at the time of the call.



Træpiller

[FrenchFrog]

I have found a workaround. Create a class which extends the CommonsPoolTargetSource and add a public method to instantiate the objects :

	
public void customInitPool() throws Exception {
  List<Object> beans = new ArrayList<Object>();
		
  //create and retain minIdle objects to force the creation
  for(int i=0 ; i<this.getMaxSize() ; ++i)
    beans.add(this.getTarget());
    for(Object o : beans)
      this.releaseTarget(o);
	
      beans.clear();
}

And then, add a call to this method in the xml configuration file :

<bean id="targetBeanPool" class="MyCustomPool" init-method="initPoolSeInfo" init-method="customInitPool">

I am not sure this is the best way to do it, but it works.