[cdi-dev] async activation on observers, why not CompletableFuture

Sven Linstaedt sven.linstaedt at gmail.com
Tue Mar 31 12:15:52 EDT 2015

Hi Romain,

I am not sure, I have fully understand how an observer with
CompletableFuture could
look like. Could you give us an example?

Afair CompletableFuture was considered to be used in the "trigger" side in
order to track async event invocation completion.

br, Sven

2015-03-31 18:00 GMT+02:00 Romain Manni-Bucau <rmannibucau at gmail.com>:

> Hi guys,
> on async topic if I followed we are at the point where we are looking for
> an activation on the observer side.
> Since Java 8 has now CompletableFuture it would be great to use it. Today
> the spec doesnt use observer returned values so it is mainly a bad practise
> to have one even if not strictly forbidden - BTW never saw it in real
> applications - plus spec is not compatible - not specified at all -
> with CompletableFuture since it is a new API so we can use it as a marker.
> This is quite interesting for few reasons:
> 1- we have our double activation
> 2- API is user friendly (observer is async and has an async signature)
> 3- open door for future async enhancements (hopefully not in CDI) with
> composition of these observers
> Only point I'm not sure is should these observers support sync events. I
> don't see anything blocking to do it but can have missed something.
> wdyt?
> Romain Manni-Bucau
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