Hi ,
I'm getting most of this , allthogh I've only used hivemind to setup
spring injection , and I didn't get most of what I was dooing but
there was a good example in the Wiki which worked like a charm .
I'll have to try it out but one question I have so far is : what
spring integration jar ? Like i've said I've integrated spring with
tapestry through the wiki example .
Would the above example require me to use another aproach ?
thanks
cosmin
On 12/18/05, Scott Russell <[EMAIL PROTECTED]> wrote:
> Part of the problem is that if you store a Hibernate lazy POJO in your page as
> a persistent property, then the sesison will have been closed by the time you
> go to later use it (in a later request-response cycle).
>
> One trick I use is to have a special property persistence strategy source that
> reattaches persistent objects when they are requested. (This class assumes
> you already have the Spring hibernate session filter specified in web.xml,
> which opens a hibernate sesison for the length of a request-response cycle,
> and binds it to the current thread).
>
> public class HibernatePropertyPersistenceStrategySourceImpl extends
> PropertyPersistenceStrategySourceImpl {
>
> @Override
> public Collection getAllStoredChanges(String pageName) {
> Collection c = super.getAllStoredChanges(pageName);
>
> for (Iterator i = c.iterator(); i.hasNext();){
> PropertyChange pc = (PropertyChange) i.next();
> attach(pc.getNewValue());
> }
> return c;
> }
>
>
> /**
> * Attachs a loaded object to the current thread session, if not already
> *
> * @param obj
> */
> protected void attach(Object obj){
> Session session = getSession();
>
> if (obj instanceof PersistentObject) {
> PersistentObject po = (PersistentObject) obj;
> if (po.isPersistent())
> session.lock(po, LockMode.NONE);
> }
> else if (obj instanceof Collection) {
> for (Iterator i = ((Collection) obj).iterator(); i.hasNext();){
> attach(i.next());
> }
> }
> }
>
> protected Session getSession() {
> return SessionFactoryUtils.getSession(getSessionFactory(), false);
> }
>
> private SessionFactory sessionFactory;
>
> public void setSessionFactory(SessionFactory sessionFactory) {
> this.sessionFactory = sessionFactory;
> }
>
> public SessionFactory getSessionFactory() {
> return sessionFactory;
> }
> }
>
> and in hivemodule.xml (this assumes you are using the spring integration jar):
>
> <!-- Override PropertyPersistenceStrategySource implementation with
> hibernate-specific one -->
> <implementation
> service-id="tapestry.persist.PropertyPersistenceStrategySource">
>
> <invoke-factory>
> <construct
> class="com.itglovebox.tapestry.record.hib.HibernatePropertyPersistenceStrategySourceImpl">
> <set-configuration property="contributions"
> configuration-id="tapestry.persist.PersistenceStrategy"/>
> <set-object property="sessionFactory" value="spring:sessionFactory"/>
> </construct>
> </invoke-factory>
>
> </implementation>
>
>
> Hope this helps.
>
> regards,
> Scott
>
> On Mon 19 December 2005 12:24, Cosmin Bucur wrote:
> > I've also posted this on the spring forum , as I think it is sort of a
> > mixed problem . I figured that maybe other tapestry/spring/hibernate
> > users here might have some insight :
> >
> > I am using latest spring , hibernate 3 and tap 4 . I have the default
> > true setting for lazy loading in hibernate . I would like to take
> > advantage of this , from within the tapestry 4 layers .
> >
> > I am getting the : no session or session closed error .
> >
> > I've searched the forum , and came across a few good posts aslo a good
> > article : http://www.jroller.com/comments/kbau...ation_with_dao
> >
> > However if i'm understanding the article right , it's talking about
> > having an interceptor aplied to a spring business object that
> > initialises the session when needed ?
> >
> > ... that does me no good when trying to access a lazy collection from
> > a tapestry Page or Component .
> >
> > Is there a common fix for this scenario also , or am I just
> > understanding this wrong ? ... can I maybe set the tap Page as a
> > spring bean and put the intercecptor on it ?
> >
> > Anticipated thanks
> > Cosmin
> >
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