[cdi-dev] Is the concept of mutable event payload specified

John D. Ament john.d.ament at gmail.com
Tue Dec 16 11:44:37 EST 2014

What's the issue w/ fire async and mutable payload?  Non-deterministic
behavior depending on thread?

On Tue Dec 16 2014 at 11:32:53 AM Antoine Sabot-Durand <
antoine at sabot-durand.net> wrote:

> Hi guys,
> Always working on Async event concept and discussion around mutable
> payloads. I was looking where in the spec we specified the fact that fired
> payload are mutable. I red-read chapter 10  (
> http://docs.jboss.org/cdi/spec/1.2/cdi-spec.html#events) twice and didn’t
> found. I also browsed JIRA and TCK to find any ref to this feature and
> found nothing. On the other hand it is not specified that payload should be
> immutable ;)
> I’d be happy if some of you could have a look and see if I missed
> something.
> If I’m not wrong, the mutable payload we (including myself) advertise in
> CDI is a non portable feature (I’m the firs surprised here). So I propose
> that :
> 1) We decide to write something in the specification about allowing or
> forbidding it (I know some people not happy with this mix between observer
> and visitor pattern)
> 1bis) Should we decide to forbid it by default, we should provide an
> alternative mode to allow people using this unspecified feature
> 2) Forbid it for fireAsync()
> Thanks for your feedback and your correction if I missed the feature in
> the spec.
> Antoine
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