How do you find CDI beans of/in the current view (scope)? - jsf

Question

In a Java EE 6, CDI 1.1.x, Seam 3 etc. environment, we need to find all CDI beans of the current view (#ViewScoped). What I have tried so far is using:
#Named
#ViewScoped
public class ViewHelper
{
#Inject
private BeanManager beanManager;
public doSomethingWithTheBeanInstances()
{
Set<Bean<?>> beans = this.getBeanManager().getBeans(
Object.class, new AnnotationLiteral<Any>(){}
);
// do something
...
}
}
However, this returns all beans it manages.
I need to find only those within the scope of the current view and - that would be ideal - only those that implement a specific interface (inherited over over multiple hierarchy levels).
What's the way to do it?
Note since CDI has no view scope, we're using Seam 3 to be able to annotate all our view-scoped beans like:
#Named
#ViewScoped
public class ResultManagerColumnHandler extends BaseColumnHandler
{
....
}
The above would be an instance to look for (the #ViewScoped is a CDI replacement by Seam 3).
How can it be done?

Answer 1

I am not familiar with Seam, but from CDI standpoint, this is what I would try. However, bean it mind that it will only work if beanManager.getContext(ViewScoped.class); returns a valid context instance for you:
#Inject
BeanManager bm;
public List<Object> getAllViewScoped() {
List<Object> allBeans = new ArrayList<Object>();
Set<Bean<?>> beans = bm.getBeans(Object.class);
// NOTE - context has to be active when you try this
Context context = bm.getContext(ViewScoped.class);
for (Bean<?> bean : beans) {
Object instance = context.get(bean);
if (instance != null) {
allBeans.add(instance);
}
}
return allBeans;
}
You also asked to only obtain beans that implement certain interface. For that, simply modify the code line retrieving all beans with desired type:
Set<Bean<?>> beans = bm.getBeans(MyInterface.class);