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

[Jens Schumann]

Same here. For instance we use mutable events to collect data.

Just checked EJB 3.1 spec @Asynchronous regarding parameter immutability: As far I can tell it's not defined either.

Jens



On 16 Dec 2014, at 19:22, Thorben Janssen <thjanssen123 at gmail.com<mailto:thjanssen123 at gmail.com>> wrote:

We should be careful with making the payload imutable. I know of several applications (and companies) that change the payload to send some information back to to the event producer.
We shouldn't break these apps, if we can solve it in a different way.

--
Thorben Janssen

@thjanssen123<https://twitter.com/thjanssen123>
www.thoughts-on-java.org<http://www.thoughts-on-java.org>

2014-12-16 18:46 GMT+01:00 Romain Manni-Bucau <rmannibucau at gmail.com<mailto:rmannibucau at gmail.com>>:
Hi Antoine,

why isn't it portable?


Romain Manni-Bucau
@rmannibucau
http://www.tomitribe.com
http://rmannibucau.wordpress.com
https://github.com/rmannibucau


2014-12-16 18:39 GMT+01:00 Pete Muir <pmuir at redhat.com<mailto:pmuir at redhat.com>>:
> 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<mailto: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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