[hibernate-dev] Getting notified when session factory is completely set up

[Gunnar Morling]

2014/2/11 Hardy Ferentschik <hardy at hibernate.org>

> Hi,
>
> not sure whether this could work in your use case, but in Search we use a
> SessionFactoryObserver.
> We register the observer in Integrator#integrate with the
> SessionFactoryImplementor.
> Once the SessionFactory is completely build you get a callback into
> SessionFactoryObserver#sessionFactoryCreated().
>
> In Search we had the case that we did not want to complete bootstrapping
> at the integrator phase. Instead we defer
> this until the SessionFactory is completely build.
>
> Hope it helps.
>

Yes, that helps indeed. Implementing my validation routine in such an
observer works. I guess if needed, I even could implement support for the
suggested service contract in OGM with help of an observer.

Thanks!


>
> --Hardy
>
>
>
> On 11 Jan 2014, at 09:38, Gunnar Morling <gunnar at hibernate.org> wrote:
>
> > Hi,
> >
> > Is there a way for services (living in the SF-scoped registry) to get
> > notified when the session factory has been set up and perform some action
> > using that completely initialized factory?
> >
> > Upon invocation of initiateService() of SessionFactoryServiceInitiator
> > implementations, the passed factory is still under construction (the call
> > originates from SessionFactoryImpl<init>), so I can't access all members.
> > The same holds true for the StartStoppable contract in OGM which also
> sees
> > a session factory under construction.
> >
> > Now I could store the passed reference in a field and execute the
> required
> > logic (some sort of validation) later on. I only have no meaningful hook
> to
> > trigger such action exactly once. So I'd have to manage a flag to make
> sure
> > the action is only performed once.
> >
> > Is there a better way to achieve this?
> >
> > Would it make sense to provide an additional contract to notify services
> > about session factory lifecycle events:
> >
> >    public interface SessionFactoryLifecycleAware extends Service {
> >
> >        void onSessionFactoryLifecycleEvent(SessionFactoryImplementor sfi,
> > Event event);
> >
> >        public enum Event { POST_START, PRE_STOP }
> >    }
> >
> > ?
> >
> > Thanks,
> >
> > --Gunnar
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>