[jboss-dev-forums] [Design of POJO Server] - Re: Unifying metadata

[scott.stark@jboss.org]

"wolfc" wrote : 
  | You can see that a Description annotation never even enters the picture.
  | 
Right. What is needed is an annotation scanning deployer that has a plugin maps a set of annotations onto the metadata instance that resulted from the parse phase. If its a pure annotation deployment it would create the metadata from the annotations. The steps should be:
1. annotation scanning deployer provides sets of annotations based on the types the plugins have defined. This is used to create the base metadata.
2. Parsing deployer would create the next level of metadata that delegates to the annotation based instance.

"wolfc" wrote : 
  | Secondly we use the class container as meta data repository, so we can do this:
  |       <bind pointcut="execution(public * *->@javax.ejb.Remove(..))">
  |   |          <interceptor-ref name="org.jboss.ejb3.stateful.StatefulRemoveFactory"/>
  |   |       </bind>
  | 
This should be metadata on the managed aspect mc bean. We talked with Kabir about this today. The stateful ejb3 container should have a number of beans for the aspects associated with a stateful container domain.

"wolfc" wrote : 
  | Another problem: we can't use the API annotations to express all meta data, because they're not conclusive. Not everything can be expressed in annotations. So I would rather have the unified meta data as the base, which is conclusive and un-ambiguous and some translator on top. So if you ask for getAnnotation(@Remove) it will look it up in the right meta data repository in the right meta data.
I would say there should never be a lookup for an annotation, unless that is the proper metadata. The annotation should have been translated into the metadata by the annotation scanning deployer/annotation to metadata plugin. 


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