[cdi-dev] On @Observes for async events

Antoine Sabot-Durand antoine at sabot-durand.net
Wed Mar 18 04:21:59 EDT 2015

Hi Arne,

Sorry can you explain why? This value allows observer to be called inside or outside a transaction. What will be the compatibility issue?


> Le 18 mars 2015 à 09:05, Arne Limburg <arne.limburg at openknowledge.de> a écrit :
> Hi to all,
> I think the biggest issue with backward compatibility is, that the current
> @Observes annotation by default has TransactionPhase.IN_PROGRESS.
> I think we can¹t deal with this, if the default for observers would be
> async. So I think there is no way to specify async as default without
> loosing backward compatibility.
> Any other thoughts?
> Cheers,
> Arne
> Am 18.03.15 08:48 schrieb "Antoine Sabot-Durand" unter
> <antoine at sabot-durand.net>:
>> Hi all,
>> Yesterday we had another meeting to try to find a better solution than
>> explicitly activating async event on observer, without no success. I
>> understand that we should go on on this feature so what I suggest is to
>> have a meeting (an hangout) with people that want to try to find a better
>> solution. If we find something we¹ll do a last proposal, and in all case
>> we¹ll adopt the woking solution next week for this point. People
>> interested with this please manifest yourself.
>> If we have to go with opt-in (have to explicitly declare an observer
>> supporting async event) we also have to validate the decision to use a
>> member in @Observes (as it was decided before) or go back on that as
>> mMark keep asking by introducing a new annotation to add on the observer
>> (@Async or something similar). As I said when we discussed this point, I
>> prefer the member in @Observes but we may have overlooked issues linked
>> to backward compatibility.
>> A third solution might be to introduce an @ObserveAsync to declare an
>> asynchronous capable observerŠ
>> I¹m waiting for active feedback from you to find the best solution taking
>> ALL aspects (not only the technicals one) into account.
>> Thanks,
>> Antoine

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