[cdi-dev] [JBoss JIRA] (CDI-686) Could InterceptionFactory accept an interface as type parameter

Martin Kouba (JIRA) issues at jboss.org
Thu Feb 23 09:51:00 EST 2017

    [ https://issues.jboss.org/browse/CDI-686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13368235#comment-13368235 ] 

Martin Kouba commented on CDI-686:

I think I understand the use case described by [~rmannibucau] and [~tandraschko], e.g. somethig like:
interface MyService {}
class MyServiceProducer {
  MyService produce(InterceptionFactory<MyService> factory, ServiceLocator locator) {
    // Lookup a MyService implementation...
    return factory.createInterceptedInstance(locator.lookup(MyService.class));
However, I'm afraid it's too late for this kind of discussions. Since we would have to carefully adapt the inheritance rules (as defined in "4. Inheritance and specialization") for this particular use case. Note that _"Type-level metadata is never inherited from interfaces implemented by a bean."_.

> Could InterceptionFactory accept an interface as type parameter
> ---------------------------------------------------------------
>                 Key: CDI-686
>                 URL: https://issues.jboss.org/browse/CDI-686
>             Project: CDI Specification Issues
>          Issue Type: Clarification
>    Affects Versions: 2.0 .Final
>            Reporter: Antoine Sabot-Durand
> If you take this code:
> {code:java}
>     @Produces
>     public List<Object> produceList(InterceptionFactory<List<Object>> interceptionFactory) {
>         interceptionFactory.ignoreFinalMethods().configure().filterMethods((m) -> {
>             if (m.getJavaMember().getName().equals("add")
>                     && m.getJavaMember().getParameterCount() == 1) {
>                 return true;
>             }
>             return false;
>         }).findFirst().get().add(Monitor.Literal.INSTANCE);
>         return interceptionFactory.createInterceptedInstance(new ArrayList<>());
>     }
> {code}
> Parameterized type for injected {{InterceptionFactory}} is an interface {{List<Object>}}, so when calling {{configure()}}, user will work with an {{AnnotatedTypeConfigurator<List<Object>>}} to apply interceptor binding.
> In a standard interceptor usage, interceptor binding on interface are ignored (even if they have {{@Inherited}} annotation), so doing it with {{InterceptionFactory}} could be confusing for some user.

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