Thanks Jerome! That will be a much neater solution. On Thu, Feb 19, 2009 at 1:15 AM, Jerome Louvel <[email protected]> wrote: > Hi guys, > > This is such a hook available. See the ConnectorService#afterSend method: > http://www.restlet.org/documentation/snapshot/api/org/restlet/service/ConnectorService.html#afterSend(org.restlet.resource.Represent > ation) > > Hope this helps! > > Best regards, > Jerome Louvel > -- > Restlet ~ Founder and Lead developer ~ http://www.restlet.org > Noelios Technologies ~ Co-founder ~ http://www.noelios.com > > > -----Message d'origine----- > De : Michael Terrington [mailto:[email protected]] > Envoye : mercredi 18 fevrier 2009 12:23 > A : [email protected] > Objet : Re: Managing a JPA/Hibernate session > > Hi Peter, > > I recently encountered this problem myself. I ended up creating a > Representation wrapper that would close my EM after the call to write. > The code [1] is part of restlet-jpa [2]. > > Regards, > Michael. > > [1] - > http://trac.sarugo.org/restlet-jpa/browser/trunk/src/main/java/org/sarugo/restlet/jpa/TransactionFilter.java > > [2] - http://trac.sarugo.org/restlet-jpa/ > > On Wed, Feb 18, 2009 at 10:22 AM, Peter Becker <[email protected]> wrote: >> Hello, >> >> I'm using Restlet above a JPA persistence layer with Hibernate as provider. >> That works reasonably well, but unfortunately I haven't found a way to >> handle the persistence sessions properly. >> >> What I would like to see is that a new session is opened whenever needed and >> is closed after all request processing is done. This is my current attempt: >> >> public class EntityManagerFilter extends Filter implements >> EntityManagerSource { >> >> private final EntityManagerFactory emf; >> private final ThreadLocal<EntityManager> entityManagerTL = new >> ThreadLocal<EntityManager>(); >> >> public EntityManagerFilter(Context context, Restlet next, >> EntityManagerFactory emf) { >> super(context, next); >> this.emf = emf; >> } >> >> public EntityManagerFilter(Context context, EntityManagerFactory emf) { >> super(context); >> this.emf = emf; >> } >> >> public EntityManagerFilter(EntityManagerFactory emf) { >> this.emf = emf; >> } >> >> public EntityManager getEntityManager() { >> // we lazily initialize in case the entity manager is not actually >> needed >> // by a request >> EntityManager entityManager = entityManagerTL.get(); >> if(entityManager == null) { >> entityManager = emf.createEntityManager(); >> entityManagerTL.set(entityManager); >> } >> return entityManager; >> } >> >> @Override >> protected void afterHandle(Request request, Response response) { >> EntityManager entityManager = entityManagerTL.get(); >> if(entityManager!=null) { >> entityManagerTL.remove(); >> assert entityManager.isOpen(): >> "Entity manager should only be closed here but must have >> been closed elsewhere"; >> entityManager.close(); >> } >> super.afterHandle(request, response); >> } >> } >> >> This filter is attached as the root of the application, forwarding to the >> router that does the main dispatch. >> >> The approach works to some extent, but with a huge "but": most of the time I >> produce TemplateRepresentations to render data with Freemarker. The >> processing of those templates happens after the afterHandle(..) method of >> the filter, which means that the session is closed and if the template uses >> anything that is not eagerly fetched and the Java code hasn't used it will >> get an exception from the persistence layer. That is actually a pretty >> common case since a lot of the details of objects is needed only in the >> template rendering. >> >> Currently I work around that problem by explicitly loading objects in Java >> code. I'd rather solve that problem properly, but I can't find a hook that >> gets called after the write(..) method of the representations. Long intro, >> short question: Is there such thing? >> >> Thanks, >> Peter >> >> ------------------------------------------------------ >> http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447&dsMessageId=1182479 >> > > ------------------------------------------------------ > http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447&dsMessageId=1185212 > > ------------------------------------------------------ > http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447&dsMessageId=1186386 >
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