Hi Jody
Thanks for this I know have the events firing as they should be.
Thanks
David
On 27 September 2011 16:00, Jody Grassel <fyrew...@gmail.com> wrote:
> Good morning, David.
>
> The @PostPersist callback isn't guaranteed to fire at the moment
> em.persist(entity) or em.merge(newEntity) is called. What is guaranteed is
> that it will fire when the transaction completes (I think calling
> em.flush()
> will also trigger any pending PostPersist callback invocations as well.)
>
> On the otherhand, @PrePersist is guaranteed to fire when persist() or
> merge(newEntity) is called. For your situation, you may be better off
> using
> @PrePersist for handling update notifications to your UI.
>
> Now, @PrePersist and @PostPersist fire only when new rows are to be added
> to
> the database. For modifications of existing rows (such as entities
> acquired
> by em.find() or queries, merging an edited detached entity, or further
> modifications to a still-managed new entity whose row has been committed to
> the database, it is the @PreUpdate and @PostUpdate callbacks are fired.
>
>
> On Tue, Sep 27, 2011 at 9:41 AM, David Beer <david.m.b...@googlemail.com
> >wrote:
>
> > Hi All
> >
> > I am try to listen for events when an Entity is persisted, updated and
> > removed. This is simply so that I can update the model which handles the
> > UI.
> > I have successfully added @EntityListeners(EntryListener.class) anotation
> > to
> > the entity class. My EntryListener class looks like the following.
> >
> > public class EntryListener implements EntityListener{
> >
> > private PropertyChangeSupport pss = new PropertyChangeSupport(this);
> > private EntityNotification en =
> > Lookup.getDefault().lookup(EntityNotification.class);
> >
> > /**
> > * Blank no arg constructor
> > */
> > public EntryListener() {
> > }
> >
> > @PostPersist
> > @Override
> > public void postPersist(Object obj) {
> > en.postPersist(obj);
> > }
> >
> > @Override
> > public void prePersist(Object obj) {
> > Logger.getLogger(EntryListener.class.getName()).log(Level.INFO,
> > "prePersist fired");
> > }
> >
> > @Override
> > public void preUpdate(Object obj) {
> > Logger.getLogger(EntryListener.class.getName()).log(Level.INFO,
> > "preUpdate fired");
> > }
> >
> > @Override
> > public void postUpdate(Object obj) {
> > Logger.getLogger(EntryListener.class.getName()).log(Level.INFO,
> > "postUpdate fired");
> > en.postUpdate(obj);
> > }
> >
> > @Override
> > public void postRemove(Object Obj) {
> > Logger.getLogger(EntryListener.class.getName()).log(Level.INFO,
> > "postRemove fired");
> > }
> >
> > @Override
> > public void preRemove(Object obj) {
> > Logger.getLogger(EntryListener.class.getName()).log(Level.INFO,
> > "preRemove fired");
> > }
> >
> > @Override
> > public void addPropertyChangeListener(PropertyChangeListener pcl) {
> > pss.addPropertyChangeListener(pcl);
> > }
> >
> > @Override
> > public void removePropertyChangeListener(PropertyChangeListener pcl) {
> > pss.removePropertyChangeListener(pcl);
> > }
> >
> > }
> >
> > The problem is that I seem to be able to catch the event for @postPersist
> > when a new item is added to the database. I am not closing the
> > EntityManager
> > each time as a lot of transactions can occur. But am getting the data
> > straight from the db when updated and then passed to the UI. This works
> > well
> > for when I add an entry with em.persist. But If I update an item in the
> UI
> > and try to either persist the updated item or merge the item no event is
> > being thrown.
> >
> > Any advice is much appreciated.
> >
> > Thanks
> >
> > David
> >
>
