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luni, 9 februarie 2015

[OmniFaces utilities (2.0)] Get the current injection point within a dynamic producer Bean

[OmniFaces utilities] The getCurrentInjectionPoint() gets the current injection point when called from a context where injection is taking place (e.g. from a producer).This is mostly intended to be used from within a dynamic producer Bean. For a "regular" producer (using Produces) an InjectionPoint can either be injected into the bean that contains the producer method, or directly provided as argument of said method.


JSF page
  <h:commandButton value="BeanA" action="#{beanA.randomNumberA()}"/>
  <h:commandButton value="BeanB" action="#{beanB.randomNumberB()}"/>

DynamicProducer (see Dynamic CDI producers, 1 August 2014, by: Arjan Tijms)

import javax.enterprise.inject.spi.InjectionPoint;
import org.omnifaces.util.Beans;

public class DynamicIntegerProducer implements Bean<Integer> {
 public Integer create(CreationalContext<Integer> creationalContext) {
  InjectionPoint injectionPoint = Beans.getCurrentInjectionPoint(creationalContext);
  System.out.println("Current Injection Point: " + injectionPoint);
  // do something with the injection point
  return new Random().nextInt(1000);

public class BeanA {

 private Integer rndA;

 public void randomNumberA() {
  System.out.println("Injected random number in BeanA: " + rndA);

public class BeanB {
 private Integer rndB;
 public void randomNumberB() {
  System.out.println("Injected random number in BeanB: " + rndB);

Now, press button BeanA and afterwards button, BeanB. You will see this output:

Current Injection Point: [BackedAnnotatedField] @Inject private some.beans.BeanA.rndA
Injected random number in BeanA: 538
Current Injection Point: [BackedAnnotatedField] @Inject private some.beans.BeanB.rndB
Injected random number in BeanB: 266


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