[cdi-dev] Would @PostActivate, @PrePassivate and @Remove make sense in JSR 250 ?

[Antonio Goncalves]

I should have explained my PoV a bit better. I'm trying to take the EJB
services, extract them, see if they could benefit for other components, if
yes, in which spec could they go.

Today, there is less and less difference between :

@Stateful
@SessionScoped
public class MySessionBean {
  @PersistenceContext
  EntityManager em;
  ...
}

And :

@Transactional
@SessionScoped
public class MySessionBean {
  @PersistenceContext
  EntityManager em;
  ...
}

So I wonder if it would make sense to bother with @PostActivate,
@PrePassivate. I could see the benefit of @Remove though.

Antonio


On Sun, Dec 28, 2014 at 5:21 PM, arjan tijms <arjan.tijms at gmail.com> wrote:

> Hi,
>
> On Sun, Dec 28, 2014 at 1:52 PM, John D. Ament <john.d.ament at gmail.com>
> wrote:
>
>> EJBs work off of a pool of objects and these life cycle methods are
>> typically used (from the use cases I've dealt with them) to initiate or
>> destroy some end user data for the context in which they are used.
>>
>
> @PrePassivate/@PostActivate are used with @Stateful beans, which being
> unique instances are far less likely to be pooled. Pools are mostly used
> for @Stateless beans (if pools are used at all, the spec doesn't mandate
> those).
>
> Kind regards,
> Arjan Tijms
>
>
>
>>
>> I think you might be thinking of PostConstruct/PreDestroy which match to
>> the CDI/ManagedBean paradigm better.  There's no pool of these objects
>> around, they simply get created and destroyed when done.  For each of the
>> scopes you mentioned, I would use a PostConstruct/PreDestroy method to do
>> the same thing.
>>
>> John
>>
>> On Sun Dec 28 2014 at 7:39:14 AM Antonio Goncalves <
>> antonio.goncalves at gmail.com> wrote:
>>
>>> Hi all,
>>>
>>> I was playing with @SessionScoped beans... and wondered if
>>> @PostActivate, @PrePassivate and @Remove would make sense in JSR 250 ?
>>>
>>> At the moment these annotations belong to the javax.ejb package and are
>>> only used in @Stateful EJBs. With CDI scopes, we end up with a few
>>> "stateful" scopes (@SessionScoped, but also @ConversationScoped,
>>> @ViewScoped...) so why not having the same functionality in CDI ?
>>> @PreDestroy and @PostConstruct are already part of JSR 250. So why not
>>> having @PostActivate and @PrePassivate as well so they could be used in
>>> every bean ?
>>>
>>> BTW, while I was playing with @SessionScoped beans, I asked Antoine to
>>> show me how to remove a bean from the session. It's only a few lines of
>>> code, but again, why not having a @Remove annotation that does that (the
>>> exact same one of javax.ejb.Remove) ?
>>>
>>> To summarize, why not taking some of those stateful EJB concerns back to
>>> JSR 250 so they could be used anywhere ?
>>>
>>> Any thoughts ?
>>>
>>> --
>>> Antonio Goncalves
>>> Software architect, Java Champion and Pluralsight author
>>>
>>> Web site <http://www.antoniogoncalves.org> | Twitter
>>> <http://twitter.com/agoncal> | LinkedIn
>>> <http://www.linkedin.com/in/agoncal> | Pluralsight
>>> <http://pluralsight.com/training/Authors/Details/antonio-goncalves> | Paris
>>> JUG <http://www.parisjug.org> | Devoxx France <http://www.devoxx.fr>
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>>
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>
>


-- 
Antonio Goncalves
Software architect, Java Champion and Pluralsight author

Web site <http://www.antoniogoncalves.org> | Twitter
<http://twitter.com/agoncal> | LinkedIn <http://www.linkedin.com/in/agoncal> |
Pluralsight
<http://pluralsight.com/training/Authors/Details/antonio-goncalves> | Paris
JUG <http://www.parisjug.org> | Devoxx France <http://www.devoxx.fr>
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