[cdi-dev] [JBoss JIRA] (CDI-590) Provide a way to produce any type in a producer

Matej Novotny (JIRA) issues at jboss.org
Tue Mar 22 08:33:00 EDT 2016

    [ https://issues.jboss.org/browse/CDI-590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180515#comment-13180515 ] 

Matej Novotny commented on CDI-590:

I don't really like this idea. It feels 'hacky' and it could also contradict the type-safe approach.

If I got it right, the idea is to have this producer:
@MyProducerQualifier // this Qualifier has some annotation saying it is 'generic'
public Object create() {
   // do some work and return Object

and then for this one producer to have the following injections:
String string;

Integer int;

Could you give a more specific use-case showing where this would make sense (or even better, be neccessary)?

> Provide a way to produce any type in a producer
> -----------------------------------------------
>                 Key: CDI-590
>                 URL: https://issues.jboss.org/browse/CDI-590
>             Project: CDI Specification Issues
>          Issue Type: Epic
>            Reporter: Romain Manni-Bucau
> Note: this is a follow up "adding generic producers to CDI 2.0?" thread on the list
> It is common to rely on a subsystem (another IoC, a coercing system, ...) to produce values. Today a producer can't say "I produce anything in a safe" manner.
> Idea would be for injection point aware producers with a qualifier to producer Object and match all types.
> It needs another flag (can be in @Qualifier or another annotation it is not really important) to say "I produce safely any type".
> I did a PoC on github: https://github.com/rmannibucau/generic-producer-cdi but think it can be a nice feature of CDI 2.0 since it would avoid users to have to dig into extensions for several simple cases (configuration, bridge to other IoC...)

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