This must be a very common question...
Fodder for the FAQ or "Tapestry Almanac"?
Moved my persistence over to Hibernate and as you expect this was a godsend
and only took a couple of hours.
Naturally, 2 weeks later I am still trying to get it to work ;)
I have managed to get it to work pretty well by switching cascade off
everywhere (probably due to exposing such a big object graph into the
pages).
Leaving me with a problem of transactions...
The best solution reported on the internet (hibernate site) was to extend
the BaseEngine and wrap all calls in a transaction.
The solution below was pretty naive and I was wondering if someone has a
better solution as the Visit object seems to not be available at this point
(I am not using Spring yet).
public class SentinelEngine extends BaseEngine {
private static final long serialVersionUID = 7768775316660511012L;
protected void setupForRequest(RequestContext context) {
super.setupForRequest(context);
// Start a session and a transaction
System.out.println("Building up the session and and starting
a transaction");
IDAOFactory datastore = AbstractDAOFactory.soleInstance();
datastore.getController().start();
Transaction transaction =
(Transaction)datastore.getController().beginTrasnsaction();
Visit visit = (Visit)getVisit();
if (visit == null) {
visit = new Visit();
}
visit.setTransaction(transaction);
setVisit(visit);
}
protected void cleanupAfterRequest(IRequestCycle cycle) {
super.cleanupAfterRequest(cycle);
// Commit the transaction and clear down the session
System.out.println("committing the transaction and tearing
down the session");
IDAOFactory datastore = AbstractDAOFactory.soleInstance();
Visit visit = (Visit)getVisit();
datastore.getController().commit(visit.getTransaction());
datastore.getController().finish();
visit.setTransaction(null);
}
}
public class HibernateController implements IController {
public void start() {
SessionFactory.currentSession();
}
public Object getSession() {
Session session = SessionFactory.currentSession();
return session;
}
public Object beginTrasnsaction() {
Session session = SessionFactory.currentSession();
return session.beginTransaction();
}
public void commit(Object transaction) {
((Transaction)transaction).commit();
}
public void finish() {
Session session = SessionFactory.currentSession();
session.flush();
SessionFactory.closeSession();
}
}
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