[cdi-dev] [JBoss JIRA] (CDI-628) Allow overriding of Scope at Injection Point

[Stephan Knitelius (JIRA)]

Stephan Knitelius created CDI-628:
-------------------------------------

             Summary: Allow overriding of Scope at Injection Point
                 Key: CDI-628
                 URL: https://issues.jboss.org/browse/CDI-628
             Project: CDI Specification Issues
          Issue Type: Feature Request
    Affects Versions: 2.0 (proposed)
            Reporter: Stephan Knitelius
            Priority: Optional


Allow overriding scopes at injection point.

{code}
@SessionScope
public class FeatureState {...}

public class Bean B {
  @Inject
  @ConversationScoped //Overriding original scope
  public BeanA beanA;
  ...
}
{code}

Sample use-case for for a feature flag:

{code}
@Alternative
public class FeatureStateProducer {

  @Inject
  @SessionScoped
  private FeatureState devState;

  @Inject
  @ConversationScoped
  private FeatureState viewState;

  @Inject
  private JNDIProvider jndiProvider;

  private boolean viewOnly = true;

  @PostConstruct
  public void postConstruct() {
    this.viewMode = ...; //read config.
  }

  @Produces
  public FeatureState produce() {
    return viewOnly ? viewState : devState;
  }

}
{code}

Currently this can be solved by overriding scope with @Qualifiers:
{code}
@ViewMode
@ConversationScoped
public class ViewFeatureState extends FeatureState {...}

@DevMode
@SessionScoped
public class DevFeatureState extends FeatureState {...}
{code}

Risks:
* developers might start to define the scopes at IP and on bean (hard to maintain).
* confusing when debugging, annotation on bean, e.g. @ApplicationScoped yet behaving differently.
* etc... 





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