On Sat, Jan 6, 2018 at 2:06 AM, Brian Stansberry <
brian.stansberry(a)redhat.com> wrote:
On Fri, Jan 5, 2018 at 8:43 AM, David Lloyd <david.lloyd(a)redhat.com>
wrote:
> On Fri, Jan 5, 2018 at 8:20 AM, Brian Stansberry
> <brian.stansberry(a)redhat.com> wrote:
> > In practice the suffix is required. The deployment unit processors need
> to
> > know whether they are interested in the deployment, and in the end that
> gets
> > back to some DUP or other checking the suffix. The alternative would be
> DUPs
> > speculatively digging into the deployment, checking for deployment
> > descriptors or annotations and the like and that would be more
> expensive,
> > likely buggy (e.g. false positives when some class in the classpath
> includes
> > an annotation not relevant to the deployment) and could mess up some use
> > cases where we want to defer classloading.
>
> Another alternative is for an early processor to identify the type,
> tag it on to the deployment context, and then we modify all other DUPs
> to use that information. It seems pretty fragile to rely on the name,
> particularly if that mechanism allows the "type" of deployment to
> change in mid-deploy.
>
I agree; if it's not done that way now, it should be. My *impression* is
the general pattern was the way you describe, i.e. for each significant
type some early DUP determines it's a relevant type and attaches some stuff
and then later ones rely on the attachments. But my impression could very
well be wrong in some or many cases. I haven't done much DUP work beyond
code reviews or simple fixes since the AS 7.0 days.
But that early processor still needs a way to identify type and I think
that comes down to the suffix.
Yes, various early DUP's
call org.jboss.as.ee.structure.DeploymentTypeMarker#setType to set the
deployment type, but it is identified via suffix.
As most deployment descriptors are optional there is no 100% reliable way
of identifying this other than the suffix.
Stuart
--
Brian Stansberry
Manager, Senior Principal Software Engineer
Red Hat
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