[cdi-dev] [JBoss JIRA] (CDI-471) Support repeating qualifiers in typesafe resolution mechanism

[Antonin Stefanutti (JIRA)]

Antonin Stefanutti created CDI-471:
--------------------------------------

             Summary: Support repeating qualifiers in typesafe resolution mechanism
                 Key: CDI-471
                 URL: https://issues.jboss.org/browse/CDI-471
             Project: CDI Specification Issues
          Issue Type: Feature Request
          Components: Resolution
            Reporter: Antonin Stefanutti


As Java 8 provides improved support for [repeating annotations|http://docs.oracle.com/javase/tutorial/java/annotations/repeating.html], it would be valuable to percolate that support into the CDI typesafe resolution mechanism.

For example, one could write:

{code}
@Qualifier
@Repeatable(ContextNames.class)
public interface @ContextName {
    String value;
}

public @interface ContextNames {
    ContextName[] value();
}
{code}

And then:

{code}
@ContextName("ctx1")
class CamelContext1 {
}

@ContextName("ctx2")
class CamelContext2 {
}

@Uri("")
@Produces
@ContextName("ctx1")
@ContextName("ctx2")
static ProducerTemplate producerTemplate(InjectionPoint ip, @Any Instance<CamelContext> instance) {
}
{code}

That enables to use annotations both as a CDI qualifiers and a metadata providers while still be relying on standard typesafe resolution mechanism during the deployment phase to detect unsatisfied or ambiguous dependencies.

Support of the annotation container / list for backward compatibility could be provided as well.



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