[cdi-dev] Tests on observer resolution

Pete Muir pmuir at redhat.com
Mon Mar 17 07:25:07 EDT 2014

There are no “best match” semantics in CDI I know of…

On 16 Mar 2014, at 23:56, John D. Ament <john.d.ament at gmail.com> wrote:

> Funny that this comes up now.  I actually hacked into my coworker's
> code using an observer on any object.
> I always assumed the use of @Any in the examples came from a different
> version of the event observer pattern where it was a best match, not
> an any match.
> On Sun, Mar 16, 2014 at 1:51 PM, Pete Muir <pmuir at redhat.com> wrote:
>> Yeah, agreed, this is something I've puzzled over before.
>> On 6 Mar 2014, at 11:51, Antoine Sabot-Durand <antoine at sabot-durand.net> wrote:
>>> Hi all
>>> Yesterday when reviewing Martin Pull Request [1] regarding CDI 422 [2], we started a discussion about Observer Resolution about a possible issue in the spec. I will not repeat what was said on the IRC, if you're interested you can check the transcript [3] from 09:43.
>>> To check if this was an issue or not I did some test this morning with different implementations. You can grab the tests on Github [4]
>>> Good news : OWB and Weld (1.x and 2.x) have the same behavior : the one describe in the current spec, so there are no issue on this point.
>>> The only strange thing for me is that @Any seems totally useless regarding events firing
>>> If you write :
>>> @Inject Event<Payload> payLoadEvent;
>>> or
>>> @Inject @Any Event<Payload> payLoadEvent;
>>> You'll always be allowed call payLoadEvent.select(new QualifierLiteral()) in both case...
>>> Perhaps this point can be discussed to see if we remove @Any from the examples in the spec or if we enforce its usage in the specification...
>>> Antoine
>>> [1] https://github.com/cdi-spec/cdi/pull/207
>>> [2] https://issues.jboss.org/browse/CDI-422
>>> [3] http://transcripts.jboss.org/channel/irc.freenode.org/%23jsr346/2014/%23jsr346.2014-03-05.log.html
>>> [4] https://github.com/antoinesd/EventsTest
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