Hi All,
In Seam Social, in order to support polymorphism I need the service beans to be
qualified with the name of the service. For instance :
@RelatedTo("LinkedIn")
public class LinkedInJackson extends OAuthServiceBase implements LinkedIn
It allows users to inject a service bean like that
@Inject @RelatedTo("LinkedIn")
OAuthService service;
As I want to ease user life I also need to support this kind of injection (same
results as above)
@Inject
LinkedIn service;
As LinkedIn interface has only one implementation, using a qualifier when I use
its specific type is useless and could be confusing.
Until now I registered the second version of the bean (without a qualifier)
thru a producer, but as each service bean will have both registration (with and
without qualifier) I decided to simplify this bi-registration with an extension
(it will also ease the writing of new service bean for third party developers).
My extension works in 2 steps :
First it collects in a Map all the annotated type which are OAuthService
children and have a @RelatedTo qualifier :
public void processServicesBeans(@Observes ProcessManagedBean<OAuthService>
pbean) {
Annotated annotated = pbean.getAnnotated();
if (annotated.isAnnotationPresent(RelatedTo.class)) {
RelatedTo related = annotated.getAnnotation(RelatedTo.class);
String name = related.value();
servicesBean.put(name, pbean.getAnnotatedBeanClass());
}
}
Then, after the bean discovery, it register a new version of each Qualified
bean without the qualifier (thanks to solder !).
public void afterBeanDiscovery(@Observes AfterBeanDiscovery abd, BeanManager
bm) {
for (String type : servicesBean.keySet()) {
AnnotatedType<? extends OAuthService> annotatedType =
servicesBean.get(type);
AnnotatedTypeBuilder annoBuilder = new
AnnotatedTypeBuilder().readFromType(annotatedType).removeFromClass(
RelatedTo.class);
AnnotatedType myAnnotatedType = annoBuilder.create();
BeanBuilder beanBuilder = new
BeanBuilder(bm).readFromType(myAnnotatedType);
abd.addBean(beanBuilder.create());
}
}
This seems to work quite well except that my service Beans have a
@Postconstruct method and at initialization Weld throws the following exception
org.jboss.weld.exceptions.DefinitionException: WELD-000805 Cannot have more
than one post construct method annotated with @PostConstruct for public class
org.jboss.seam.social.linkedin.LinkedInJackson
If I remove the @Postconstuct in the AnnotatedTypeBuilder by changing its
declaration by :
AnnotatedTypeBuilder annoBuilder = new
AnnotatedTypeBuilder().readFromType(annotatedType).removeFromClass(
RelatedTo.class).removeFromAll(PostConstruct.class);
Initialization works, I have my 2 beans, but the one I registered without
qualifier won't execute the @PostConstruct method (since I had to remove it). I
guess I'm missing something in the CDI meta-meta-maze :-). Any help or
suggestion would be nice.
Thanks,
Antoine SABOT-DURAND_______________________________________________
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