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https://issues.jboss.org/browse/SEAMPERSIST-75?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Porter resolved SEAMPERSIST-75.
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Fix Version/s: 3.1.0.Final
Resolution: Won't Fix
According to Stuart Douglas, this cannot be done currently.
> Provide a way to intercept method calls from EntityManager
> ----------------------------------------------------------
>
> Key: SEAMPERSIST-75
> URL: https://issues.jboss.org/browse/SEAMPERSIST-75
> Project: Seam Persistence
> Issue Type: Feature Request
> Affects Versions: 3.1.0.Beta4
> Reporter: Anthony O.
> Priority: Critical
> Fix For: 3.1.0.Final
>
>
> I'm trying to intercept method calls to {{EntityManager}} in order to make
> modifications to some entities before persisting them.
> I've tried many ways to do that (see
> http://stackoverflow.com/questions/8213285/how-to-intercept-methods-of-entitymanager-with-seam-3)
> but I see that the real problem is that it's not easy to make a proxy behind
> the {{EntityManager}} bean created by
> {{org.jboss.seam.persistence.ManagedPersistenceContextExtension}}.
> It seems that a way to do that has been thinked, but cannot be used today. In
> {{ManagedPersistenceContextExtension.beforeBeanDiscovery}}, a {{Set}} of
> {{SeamPersistenceProvider}} s is created *BUT*
> {{org.jboss.seam.persistence.HibernatePersistenceProvider}} is always put in
> front of all others, so we cannot create our own provider to extend the
> features of current ones as it is chosen in EE environment which use
> hibernate (JBoss 7 for instance).
> I think the best way to do that would be to create a {{Producer}} bean and
> not an instanciable bean, as with CDI we could replace that {{Producer}} with
> an {{@Observes ProcessProducer}} and a {{setProducer()}} to extend it.
> At the moment, we can only {{@Observes ProcessBean}} on the {{EntityManager}}
> bean created by Seam Persistence, and do nothing about it as the CDI spec
> doesn't enable us to ask the container to replace the observed bean with
> {{ProcessBean}}.
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