[hibernate-dev] nested ServiceRegistry ?

ServiceRegistry itself has worked out great imo, but I am starting to run into difficulties in migrating certain things to be services. Specifically I had issues with both event listeners and Statistics. In each case the issue was slightly different, but both were solveable by having a notion of the ServiceRegistry being scoped by the SessionFactory. That is not the ideal general solution though since many services do not care about or need the SessionFactory. The only real solution I have thought of is to have the concept of a set of nested registries. In the simpliest case, I think 2.. a basic service registry and a session factory scoped one where the session factory scoped one knows about the basic one (typical parent delegation). But I am looking for any other suggestions. Another option is that maybe listeners and stats are just not services in the ServiceRegistry sense. So what were the specific problems? I guess that is useful to formulate suggestions ;) In the case of statistics, its merely a case that it needs a reference to the SessionFactory to be able to answer questions like "getEntityNames, "getCollectionRoleNames", etc. In the case of listeners it is not a simple explanation. It really comes down to scoping of the listeners and timing in regards to how stuff happens at the moment because of the "freeness" of Configuration. The end result was different for each listener set. jpa, envers, bean validation, search each had unique set of problems; even the default listeners had issues. --- Steve Ebersole <steve(a)hibernate.org&gt; http://hibernate.org