[jboss-dev-forums] [Design of POJO Server] - Re: Using AnnotationEnvironment in Seam

[pete.muir@jboss.org]

Here are some questions/comments:

1) We currently only scan artifacts which have seam.properties (or META-INF/seam.properties or META-INF/components.xml). This includes:

* WEB-INF/classes
* Any lib in WEB-INF/lib
* Any lib declared in the manifest
* Any lib declared in the ear (e.g. in lib/, declared as an ejb in application.xml, declared in the manifest)
* Any lib in our parent classloaders

How do we replicate this behaviour?

2) We have other deployment handlers

e.g. org.jboss.seam.deployment.ComponentsXmlDeploymentHandler::handle

public void handle(String name, ClassLoader classLoader)
  |    {
  |       if (name.endsWith(".component.xml") || name.endsWith("/components.xml")) 
  |       {
  |           // we want to skip over known meta-directories since Seam will 
  |           // auto-load these without a scan
  |           if (!name.startsWith("WEB-INF/") && !name.startsWith("META-INF/")) 
  |           {
  |               resources.add(name);
  |           }           
  |       }
  |            
  |    }

For this approach to decrease deployment time, we need to not scan at all (or scan a very limited set of files), so can we get this metadata (files, based on their filename) from the MC?

If you want to look at the handlers which are relevant:

* org.jboss.seam.deployment.AnnotationDeploymentHandler (support for users to specify their own annotations to handle, the AnnotationEnv backed version can just be a facade)
* org.jboss.seam.deployment.ComponentDeploymentHandler
* org.jboss.seam.deployment.ComponentsXmlDeploymentHandler
* org.jboss.seam.deployment.DotPageDotXmlDeploymentHandler
* org.jboss.seam.deployment.NamespaceDeploymentHandler
* org.jboss.seam.bpm.PageflowDeploymentHandler

3) For the future, can we add support for metaannotations support? This will make it supereasy to use for WB.

E.g. 

public interface AnnotationEnvironment
  | {
  |    ...
  |    boolean hasClassMetaAnnotatedWith(Class<? extends Annotation> annotation);
  | 
  |    // etc.
  | 

annotationEnvironment.hasClassMetaAnnotatedWith(javax.webbeans.DeploymentType.class);

4) How does it handle exceptions loading classes? Throw them for us to catch?


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