[DELTASPIKE-315] Provide a producer for EntityManagerFactories

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.3-incubating
• Fix Version/s: 0.4
• Component/s: JPA-Module
• Assignee: Mark Struberg
• Reporter: Mark Struberg
• Created: 17/Feb/13 05:37
• Updated: 02/Jun/13 10:27
• Resolved: 26/May/13 19:49

Description

I found myself using the following pattern quite often in projects in the last time. I have a @Qualifier UnitName(value) and a producer for a @Dependent EntityManagerFactory for it. The configuration is mostly provided via the persistenceProperties Map in EntityManagerFactory#createEntityManagerFactory(unitname, persistenceProperties);
We can further tweak the config lookup path and define a route which makes the most sense.

This can be used to create the EntityManager producer very easily.

@ApplicationScoped
public class MyEntityManagerProducer {
private @Inject @UnitName("orderUnit") EntityManagerFactory emf;

@Produces @RequestScoped
public EntityManager createEm()

{ return emf.createEntityManager(); }

.. + disposer
}

Please note that the EMF producer doens't clash with anything else as it only produces EMFs with the Qualifier @UnitName!

Issue Links

• is related to: DELTASPIKE-187 @PersistenceContext with @Transactional outside of application servers