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

[Pete Muir]

I don’t think it’s specified. As objects are, by default in Java, mutable, I would assume that payloads are implicitly mutable.

> On 16 Dec 2014, at 16:31, 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 <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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