[cdi-dev] [JBoss JIRA] (CDI-178) Require container-provided Producer implementation to use getInjectionPoints()

Pete Muir (Updated) (JIRA) jira-events at lists.jboss.org
Wed Oct 26 09:15:47 EDT 2011

     [ https://issues.jboss.org/browse/CDI-178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pete Muir updated CDI-178:

       Summary: Require container-provided Producer implementation to use getInjectionPoints()  (was: Require container-provided InjectionTarget implementation to use getInjectionPoints())
    Issue Type: Clarification  (was: Feature Request)

Currently the spec doesn't explicitly require the Producer (and it's subclass) InjectionTarget to use getInjectionPoints to examine the injection point definitions. This is the intent of the spec, it appears Weld at least doesn't comply with this though.
> Require container-provided Producer implementation to use getInjectionPoints()
> ------------------------------------------------------------------------------
>                 Key: CDI-178
>                 URL: https://issues.jboss.org/browse/CDI-178
>             Project: CDI Specification Issues
>          Issue Type: Clarification
>          Components: Portable Extensions
>    Affects Versions: 1.0
>            Reporter: Jozef Hartinger
>            Priority: Minor
>             Fix For: 1.1 (Proposed)
> A CDI extension should be able to turn a field of a into a CDI injection point as easily as by overriding the getInjectionPoints() method of the container-provided InjectionTarget implementation e.g.:
> {code}
>     event.setInjectionTarget(decorate(event.getInjectionTarget()));
> ...
>     protected <T> InjectionTarget<T> decorate(final InjectionTarget<T> delegate)
>     {
>         return new ForwardingInjectionTarget<T>() {
>             @Override
>             public Set<InjectionPoint> getInjectionPoints() {
>                 Set<InjectionPoint> injectionPoints = new HashSet<InjectionPoint>();
>                 injectionPoints.addAll(super.getInjectionPoints());
>                 injectionPoints.addAll(); // additional injection points
>                 return injectionPoints;
>             }
>             @Override
>             protected InjectionTarget<T> delegate() {
>                 return delegate;
>             }
>         };
>     }
> {code}
> However, the spec does not require the container-provided InjectionTarget implementation to make use of the getInjectionPoint() method when creating a new instance. As a result, the approach above may or may not work.
> Therefore, it is currently necessary for a portable extension to also provide an implementation of at least the inject() method (for field injection points) and implement the injection itself. This is problematic in 1.0 of the spec since a portable extension does not necessarily have access to the BeanManager instance of the BDA where the injection target is deployed, thus different visibility rules apply.
> Clarify that the container-provided implementation of the Producer interface should use the result of the getInjectionPoints() method as a source of information about the injection points to inject.

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