CODEWITHSUNDEEP
javacdijavabeansjava-ee-8
zouari
zouari

Reputation: 1067

CDI Instance Producer

The instances passed to my producer does represent effective beans?

@Qualif1
@Prodcues
B qualif1(@Any Instance<B> instances){
    return instances.select(B1.class).get(); // Select instance of B1 which extends B
}

I am wondering if instances are already beans or only the selected one will be a bean managed by the container?

Thanks in advance

Upvotes: 0

Views: 55

Answers (1)

fdreger
fdreger

Reputation: 12495

This does not depend on using instances, but on the scopes of the beans. A call to get works like any other injection point: if you get a prototype bean, a new instance of the bean gets created. If you get an eager singleton - it is already created before you call get.

It seems like your question stems from mixing up beans and instances of beans: the former are definitions (and are all, in a sense "managed" by the container), the latter are instances (which are in the direct sense "managed").

The ladder of abstraction goes like this:

class -> bean -> instance

So the "bean" is neither a class (although in some projects every bean is also a class) nor an instance (although in some projects every bean is also an instance).

Personally, I blame Spring for blurring the boundaries between the three, by encouraging usage of eager singletons for practically everything.

Upvotes: 1

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