[cdi-dev] [JBoss JIRA] (CDI-224) Support Decoration of no interface beans

Pete Muir (JIRA) jira-events at lists.jboss.org
Tue Sep 18 05:02:35 EDT 2012

     [ https://issues.jboss.org/browse/CDI-224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pete Muir resolved CDI-224.

    Fix Version/s:     (was: 1.1.PRD)
       Resolution: Rejected

We discussed this at the CDI 1.1 EG meeting, 19th Sept

Discussed this, and realised that as the decorated types are a filter for what methods are decorated, allowing decoration of classes would mean that you could no longer use a shared base class for both the decorator and the bean. Also noted that this is not backwards compatible (for the reason just mentioned). Will reject this and see if there is a user outcry!
> Support Decoration of no interface beans
> ----------------------------------------
>                 Key: CDI-224
>                 URL: https://issues.jboss.org/browse/CDI-224
>             Project: CDI Specification Issues
>          Issue Type: Feature Request
>          Components: Decorators
>    Affects Versions: 1.0
>            Reporter: Aslak Knutsen
>            Assignee: Pete Muir
> According to CDI 1.0 Spec:
> "Decorators may be associated with any managed bean that is not itself an interceptor or decorator or with any EJB session bean."
> "The set of decorated types of a decorator includes all bean types of the managed bean which are Java interfaces, except for java.io.Serializable. The decorator bean class and its superclasses are not decorated types of the decorator."
> Both CDI and EJB support No interface beans, but for some reason Decorators only work on methods from a Interface. While Interceptors on the other hand work fine with Classes. 
> I can see no technical reason to why Decorators should only work on Interfaces since all Proxies etc should already be in place.
> {code}
> import javax.decorator.Decorator;
> import javax.decorator.Delegate;
> import javax.enterprise.inject.Any;
> import javax.inject.Inject;
> import junit.framework.Assert;
> import org.jboss.arquillian.container.test.api.Deployment;
> import org.jboss.arquillian.junit.Arquillian;
> import org.jboss.shrinkwrap.api.ShrinkWrap;
> import org.jboss.shrinkwrap.api.spec.WebArchive;
> import org.jboss.shrinkwrap.impl.BeansXml;
> import org.junit.Test;
> import org.junit.runner.RunWith;
> @RunWith(Arquillian.class)
> public class DecoratesClassTestCase {
> 	@Deployment
> 	public static WebArchive create() {
> 		return ShrinkWrap.create(WebArchive.class)
> 				.addAsWebInfResource(
> 						new BeansXml().decorators(BusinessDecorator.class), "beans.xml");
> 	}
> 	@Test
> 	public void shouldBeAbleToDecorate(BusinessObject business) throws Exception {
> 		Assert.assertEquals("Decorated Test", business.send("Test"));
> 	}
> 	@Decorator
> 	public static abstract class BusinessDecorator extends BusinessObject {
> 		@Inject @Delegate @Any
> 		private BusinessObject delegate;
> 		public String send(String msg) {
> 			return "Decorated " + delegate.send(msg);
> 		}
> 	}
> 	public static class BusinessObject {
> 		public String send(String msg) {
> 			return msg;
> 		}
> 	}
> }
> {code}

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