[seam-dev] declaratively beginning a LRC in Seam 3

[Pete Muir]

On 29 Jan 2010, at 21:34, Arbi Sookazian wrote:

> I just was reading the code for one of the Seam 3 booking example classes (http://anonsvn.jboss.org/repos/seam/examples/trunk/booking/ejb-jar/src/main/java/org/jboss/seam/examples/booking/booking/BookingAgentBean.java):
> 
> public
> @Named("bookingAgent")
> @Stateful
> @ConversationScoped
> class BookingAgentBean implements BookingAgent
> {
>    private @Logger Log log;
> 
>    @PersistenceContext(type = EXTENDED) EntityManager em;
> 
> 
>    @Inject Conversation conversation;
> 
>    @Inject StatusMessages statusMessages;
> 
>    @Inject BookingFormControls formControls;
> 
>    @Registered User user;
> 
>    //@Fires @Confirmed Event<BookingEvent> bookingConfirmedEvent;
> 
>    @Inject BeanManager manager;
> 
> 
>    private Hotel hotelSelection;
> 
>    private Booking booking;
> 
>    private boolean bookingValid;
> 
>    public void selectHotel(Hotel hotel)
>    {
> 	   // NOTE get a fresh reference that's managed by the conversational persistence context
> 
>       hotelSelection = em.find(Hotel.class, hotel.getId());
> 
>       log.info("Selected the {0} in {1}", hotelSelection.getName(), hotelSelection.getCity());
>       conversation.begin();
> 
>    }
> 
> ...
> }
> 
> Note the programmatic use of beginning a LRC in the selectHotel() method above (begin()).  AFAIK, in CDI/Weld, we don't have the capability to declaratively begin a LRC (like we do in Seam 2.x with @Begin) but can we do something like write @Begin at method level in Seam 3 apps?

Yes, use an interceptor. We may add this to Seam 3, need to see what Gavin is thinking here.

> 
> Also, is @ConversationScoped required if the component is @Stateful?  Conversation scope is current default for SFSBs in Seam 2.x.

Yes, this is no longer true, @Dependent is the default scope for all beans in CDI

BTW this question is better suited to the user forum ;-)