- All Implemented Interfaces:
- Serializable, MergeEventListener
public class IdTransferringMergeEventListener
- extends DefaultMergeEventListener
Extension of Hibernate's DefaultMergeEventListener, transferring the ids
of newly saved objects to the corresponding original objects (that are part
of the detached object graph passed into the
Transferring newly assigned ids to the original graph allows for continuing
to use the original object graph, despite merged copies being registered with
the current Hibernate Session. This is particularly useful for web applications
that might want to store an object graph and then render it in a web view,
with links that include the id of certain (potentially newly saved) objects.
The merge behavior given by this MergeEventListener is nearly identical
to TopLink's merge behavior. See PetClinic for an example, which relies on
ids being available for newly saved objects: the
TopLinkClinic DAO implementations both use straight merge
calls, with the Hibernate SessionFactory configuration specifying an
Typically specified as entry for LocalSessionFactoryBean's "eventListeners"
map, with key "merge".
NOTE: Due to incompatible changes in the Hibernate 3.1 event listener API
(according to the Hibernate 3.1 RC1 release that was available at the time of
this writing), this merge event listener will currently only work as-is with
Hibernate 3.0. Consider copying this implementation and adapting it to the changed
API if you want to run it against Hibernate 3.1.
Spring 2.0 is likely to update its default implementation of this class to
Hibernate 3.1, even if the remainder of Spring 2.0's Hibernate3 support will stay
compatible with Hibernate 3.0.
- Juergen Hoeller
- See Also:
|Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
protected Object entityIsTransient(MergeEvent event,
- Hibernate 3.0 implementation of ID transferral.
Comment this out and the below in for a Hibernate 3.1 version of this class.
entityIsTransient in class
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