Well, as the developer of a framework that uses Hibernate for persistence, I say yes to more introspection APIs :)
On 9 March 2017 at 17:35, Steve Ebersole <st...@hibernate.org> wrote: > Currently in 6.0 we have the notion of a Navigable which models any "piece" > of the application's domain model[1]. We also have the notion of > a NavigableVisitationStrategy which defines the strategy for handling the > visitation of the nodes in a Navigable tree. In other words, Hibernate > defines a common visitor for how to walk the application's mapped domain > model and the NavigableVisitationStrategy implementation controls which > sub-trees are walked; e.g. we'd use this to apply JPA EntityGraphs or to > stop joining joinable Navigables after we have reached the > `max_fetch_depth` setting value. > > It is important to note that this is very, very different from JPA's model > and walking it. JPA's model essentially precludes those model nodes from > defining relational mappings as part of its type system in any sane way; > this is due to various reasons because of the model's design[2]. This > Navigable walking would walk the real/full relational mapping model. > > The design question is whether we want to expose this "domain mode walking" > as a general public API feature. This has been requested before; Max once > asked for it although I forget why. > > Making this an API means exposing quite a few things. Typical visitor > pattern, the visitor (NavigableVisitationStrategy) exposes "handle" methods > based on specific Navigable sub-types. Those sub-types would need to be > moved to API. I don't have a particular concern with that, just mentioning > it. > > Opinions on whether this should become an API? > > For sure we'd mark it @Incubating, if we decide to do it. > > [1] Short synopsis: Navigables include things like EntityPersister, > CollectionPersister, EmbeddedPersister, PersistentAttribute, > CollectionIndex, CollectionElement. A Navigable is always relative to a > NaviagbleSource. NaviagbleSources are any domain Navigable > (NavigableSource extends Navigable) which includes things like > EntityPersister, EmbeddedPersister, SingularPersistentAttribute, > CollectionElementEntity, CollectionElementEmbedded, etc . The > NaviagbleSource will be null in the case of EntityPersister (as a root), > but in all other cases the NaviagbleSource is non-null. > > [2] I won't get into the reasons here, but we can certainly follow up if > anyone challenges that assertion. > _______________________________________________ > hibernate-dev mailing list > hibernate-dev@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/hibernate-dev > _______________________________________________ hibernate-dev mailing list hibernate-dev@lists.jboss.org https://lists.jboss.org/mailman/listinfo/hibernate-dev
