[cdi-dev] [JBoss JIRA] (CDI-43) Allow Extensions to specify the annotations that they are interested in

Stuart Douglas (JIRA) jira-events at lists.jboss.org
Mon Aug 20 18:53:14 EDT 2012

    [ https://issues.jboss.org/browse/CDI-43?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12712571#comment-12712571 ] 

Stuart Douglas commented on CDI-43:

I think that should should also apply to ProcessBean, ProcessProducer etc. In this case the even is only delivered if the declaring class (i.e. Bean.getBeanClass() ) meets these requirements. 

Also "Note that if even one extension doesn't use this feature, the performance benefit is lost." is not strictly true. There can still be a saving if the extension without this annotation either: 

- Does not observer ProcessAnnotatedType
- Only looks for class level annotations (AnnotatedMethod/AnnotatedField objects are very expensive to create)

It is only if an extension does not use this annotation and also inspects every field and method of every class that there is no performance benefit.

> Allow Extensions to specify the annotations that they are interested in
> -----------------------------------------------------------------------
>                 Key: CDI-43
>                 URL: https://issues.jboss.org/browse/CDI-43
>             Project: CDI Specification Issues
>          Issue Type: Feature Request
>          Components: Portable Extensions
>    Affects Versions: 1.0
>            Reporter: Stuart Douglas
>             Fix For: 1.1 (Proposed)
> Currently portable extensions that wish to look for a specific annotation have to look through all availible classes in the ProcessAnnotatatedType event, which is quite inefficient. It would be good if extensions could do something like:
> public void processAnnotatedType(@Observes @RequireAnnotations({@Unwraps.class}) ProcessAnnotatedType pat) 
> This could allow the container to take advantage of annotation indexing to improve boot time performance, as well as reducing uneeded processing in the observer.

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