Support ViewScoped for Seam Managed Persistence Context
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Key: SEAMPERSIST-65
URL: https://issues.jboss.org/browse/SEAMPERSIST-65
Project: Seam Persistence
Issue Type: Feature Request
Affects Versions: 3.0.0.Final
Environment: JBoss AS7
Reporter: Andrew Wheeler
It would be nice to extend the SMPC to the view scope. When using ajax
frameworks view scoped pages often have many action requests. On each
invocation the bean state must be resynchronised with the persistence context
using merge. This is a little unpleasant as:
* It can lead to lots of checks to see if an entity is attached and if not to
re-attach it.
* This sometimes can cause the entity manager to flush, thus persisting merged
entities pre-maturly.
Currently it is not possible to do the following as the ViewScoped annotation
is not permitted in this context:
@ExtensionManaged
@Produces
@PersistenceUnit
@ViewScoped
EntityManagerFactory viewScopedScoped;
Secondly, even if you could then it would probably stop conversation scoped
pages from working. Perhaps the scope qualifier could be wrapped using an
annotation like @PersistenceScope(ViewScoped.class). It would probably also
require producing two entity managers and choosing the right one to inject on
the bean using the qualifier. E.g:
@Produces
@PersistenceScope(ViewScoped.class)
EntityManager viewScoped;
@Produces
@PersistenceScope(ConversationScoped.class)
EntityManager conversationScoped;
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