[cdi-dev] [JBoss JIRA] (CDI-420) add a bean-discovery-mode 'scoped'

Martin Kouba (JIRA) issues at jboss.org
Mon Feb 1 11:02:00 EST 2016

    [ https://issues.jboss.org/browse/CDI-420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13157171#comment-13157171 ] 

Martin Kouba commented on CDI-420:

>From the bootstrap performance point of view the {{annotated}} mode allows much better optimization as you don't need to load "unsuitable" classes and fire PAT at all (so if you really care about bootstrap time of a large application, the workaround mentioned in one of the previous comments is the way to go). Memory footprint would be the same compared to {{annotated}}.

Otherwise sounds good. Except for the mode name - "scoped" does not say much. And you may end with a bean class picked up even if it does not define any scope at all (e.g. if you add a stereotype annotation without scope to a class which previously has no bean defining annotation declared).

Theoretically, we could also extend the meaning of {{@WithAnnotations}} and make all the annotation values bean defining annotations. E.g. once you add an extension with PAT annotated with {{@WithAnnotations(MessageBundle.class)}} then {{MessageBundle}} becomes a bean defining annotation. Just an idea I haven't thought about this properly.

> add a bean-discovery-mode 'scoped'
> ----------------------------------
>                 Key: CDI-420
>                 URL: https://issues.jboss.org/browse/CDI-420
>             Project: CDI Specification Issues
>          Issue Type: Bug
>          Components: Packaging and Deployment
>    Affects Versions: TBD
>            Reporter: Mark Struberg
>             Fix For: 2.0 (discussion)
> This is for some future CDI release.
> We currently only have 3 bean-discovery-modes
> * none
> * all
> * annotated
> The spec also currently says that ProcessAnnotatedType will only get fired (12.4) for 
> • each Java class, interface or enum deployed in an explicit bean archive, and 
> • each Java class with a bean defining annotation in an implicit bean archive. 
> • each session bean
> Which means that we do not get the ProcessAnnotatedType (PAT) event for any class in an 'annotated' or 'implicit' BDA which does _not_ have a bean defining annotation. 
> It might be useful to fire the ProcessAnnotatedType for all classes, but do not pick them up as Beans if they (after PAT) do not have a valid scope. Effectively doing the processing but not make them @Dependent automatically if there is no scope annotation at the end of the PAT processing.
> I'm not yet 100% sure how important this distinction is in practice. Just writing this up to not forget about the idea...

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