[jsr-314-open] request for listeners to support container injection and life-cycle callbacks

[Dan Allen]

On Wed, Jul 22, 2009 at 9:11 AM, Steve Roy <steveroy at ensighttech.com> wrote:

>
> It would be nice if the design made it easy for resources to be released
> when the beforePhase/afterPhase processing completes so developers don't
> inadvertently forget to release expensive resources.
> I can see the need for the feature. There is a danger though, that it makes
> it too easy for developers to implement time & resource expensive operations
> for invocations of the JSF lifecycle, which should be considered time
> sensitive.
>

My focus was not necessarily on hooks to cleanup expensive resources. To
clarify, my focus is to get listeners to tie in better with the EE platform.
For instance, if I am developing an extension to JSF, and I want to
manipulate the JSR-299 conversation or perhaps wrap one or more phases in a
UserTransaction, there is no portable way to inject the necessary
components. Another use case is that I want to store state in a JSR-299
contextual object or a stateful EJB session bean (or a hybrid of the two).
Again, no portable way to access this bean. What I am looking for are
injections like the following:

@Resource UserTransaction transaction;
@Current Conversation conversation;
@EJB Cart cart;
@Current StatusMessages statusMessages;

Right now phase and system event listeners have to use JNDI to get at any of
those resources, with subsequent calls necessary in some cases (such as to
get a contextual instance from the BeanManager).

My point is that managed objects in the Java EE platform should be able to
receive injections. I see phase listeners and system event listeners as
managed objects.

-Dan

-- 
Dan Allen
Senior Software Engineer, Red Hat | Author of Seam in Action
Registered Linux User #231597

http://mojavelinux.com
http://mojavelinux.com/seaminaction
http://in.relation.to/Bloggers/Dan
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