Hi Andy.
Guava event bus implementation is not useful for many use cases, as it enqueues
calls, changing the usually expected execution flow.
That was the initial reason we implemented the Axon event bus support.
I saw CDI event bus implementation and seems it can handle that use case
(assuming it dispatches events as soon as they happen, not queueing them).
We are not currently planning on using JEE, but just to let you know the
original motivation, as I’m seeing you’re testing Guava events working properly
instead of Axon (devs would encounter that queueing problem if Axon is not
available).
Regards,
Oscar
> El 28 oct 2017, a las 12:40, Andi Huber <[email protected]> escribió:
>
> I just realized, we have Axon as isis/runtime dependency for more than a
> year now!? (Had thought that was a very recent change in direction.)
>
> So I guess, we may put CDI event processing on the wish-list for now,
> and support Axon on JEE.
>
> Cheers, Andi
>
> On 28.10.2017 11:00, Andi Huber wrote:
>> Hi Dan,
>> while working on JEE support for Isis, I encountered difficulties with
>> the Axon framework:
>>
>> Just the first exception thrown (there might be other issues as well)
>> originates from Axon requesting an EntityManager from JEE, which is not
>> available out of the box if not configured. (And we don't need to
>> configure one, because we - as of yet - use JDO.)
>>
>> Following earlier posts on the mailing list, I think we had event
>> processing using Guava, which worked on JEE containers without issues.
>>
>> CDI (since JEE 6 [1]) provides event processing as well, and Weld [2] which
>> is the reference implementation of CDI, is now also available for Java
>> SE. So I guess Weld could be deployed on non-CDI environments to provide
>> event processing.
>>
>> I'm confident, with some additional investigation, we can use Axon on
>> JEE, but the question emerges:
>>
>> Are we sure we want to use Axon for event processing, considering that
>> we have a tendency towards CDI anyway?
>>
>> Cheers, Andi
>>
>> [1] https://docs.oracle.com/javaee/6/tutorial/doc/gkhic.html#gkhih
>> [2] http://docs.jboss.org/weld/reference/latest/en-US/html/events.html
>>
>
Óscar Bou Bou
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