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

[Gunnar Morling]

2014/2/11 Davide D'Alto <daltodavide at gmail.com>

> > 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.
>
> In OGM, we used to have a SessionFactoryObserver but we removed it in
> favor of the SessionFactoryServiceInitiator.
> https://hibernate.atlassian.net/browse/OGM-299
>
>
But do we have a DatastoreProvider which actually makes use of the SF?

I can "inject" the SF into a DatastoreProvider by having it implement said
StartStoppable contract. But as pointed out before the SF is not yet
completely initialized at this point. So I e.g. can't access the entity
persisters.

I couldn't find any "real" implementation of StartStoppable (besides a
testing one); it might actually make sense to re-implement the support for
this contract using an observer, which would expose a fully-initialized SF
to such implementations.

The problem I'm having atm. only relates to CouchDB, so for the time being
I think I'm going to add an observer just to this module.



>
>
> On Tue, Feb 11, 2014 at 10:05 AM, Gunnar Morling <gunnar at hibernate.org>wrote:
>
>> 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
>> > > _______________________________________________
>> > > hibernate-dev mailing list
>> > > hibernate-dev at lists.jboss.org
>> > > https://lists.jboss.org/mailman/listinfo/hibernate-dev
>> >
>> >
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