[hibernate-dev] Mutable natural key caching?

[Steve Ebersole]

http://opensource.atlassian.com/projects/hibernate/browse/HHH-2879 ???

-  

Steve Ebersole
Project Lead
http://hibernate.org
steve at hibernate.org

Principal Software Engineer
JBoss, a division of Red Hat
http://jboss.com
http://redhat.com
steve.ebersole at jboss.com
steve.ebersole at redhat.com


On Tue, 2008-09-16 at 10:03 -0700, Elias Ross wrote:
> I've been looking to optimize the caching of an application which uses
> a mutable natural key, an account phone number.
> 
> Hibernate does not yet support optimized caching of
> @NaturalId(mutable=false), because of how the current natural ID
> relies on immutable IDs. The caching associates a QueryKey -> results
> and it's impossible to evict the QueryKey since the natural keys are
> embedded in it.
> 
> One solution I considered was to create an association between a set
> of natural ID values and "QueryKey". When a query is made with mutable
> natural keys, an association would be made. This could be done within
> "StandardQueryCache." And then when an entity is updated or removed,
> if there are mutable natural keys, Hibernate could locate the query
> and remove it as well. I'm not sure how I could implement this part.
> I'm guessing I'd have to add a method to QueryCache to do the removal.
> 
> public interface QueryCache {
> 
> ...
> 	public void remove(NaturalIdAssocation nia) throws HibernateException;
> 
> }
> 
> public class NaturalIdAssociation implements Serializeable {
>   Type type;
>   Set<Object> keys;
> }
> 
> Actually, thinking this over, having this removal operation would fix
> some other issues when non-mutable natural id entities are removed.
> For instance, HHH-3478, a problem found using EntityManager and
> natural IDs.
> 
> Thoughts?
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