[hibernate-dev] Cascading Lock - or re-associating object graph to an open session

[Emmanuel Bernard]

That's the expected behavior.

A seems reasonable to me. Abstract it behind HibernateHelper calls.

On Feb 22, 2011, at 5:08 PM, Sanne Grinovero wrote:

> Hi all,
> I'm needing some advice about HSEARCH-689 - MassIndexer throwing
> LazyInitializationException on associated collections.
> 
> MassIndexer design reminder:
> Search loads the root entity it needs to index via a Session A,
> attempting to initialize as less collections as possible,
> then it sends these objects to a queue, consumed by a second thread
> having Session B opened; this takes the objects from the queue and
> attaches them to their own session to continue processing.
> 
> - Session A detaches objects using
>   session.clear()
> 
> - Session B attaches objects using
>   session.buildLockRequest( LockOptions.NONE ).lock( take );
> 
> Now in the particular case of this issue, the object loaded by A is
> having a property containing an AbstractPersistentCollection, which is
> send to second thread un-initialized.
> When Session B iterates over this collection, while the object is
> attached, it seems the collection is not, as:
> org.hibernate.collection.AbstractPersistentCollection.isConnectedToSession()
> returns false because session==null;
> 
> I just verified that if this collection is annotated with
> cascade={CascadeType.ALL}, then the "lock none" operation seems to be
> propagated to the collection, and the indexer works.
> (Same with @Cascade(value = { org.hibernate.annotations.CascadeType.LOCK }) )
> 
> So a quick workaround for this is to use the CascadeType.ALL, but what
> is a batter solution for the MassIndexer ?
> options:
> A) DocumentBuilderIndexedEntity.java:466 should make sure the
> AbstractPersistentCollection is attached, or attach it if needed.
> but we would like this code area to be Hibernate independent.
> B) Have core provide some method like "lock entity and all linked
> collections recursively", something which performs the same as the
> cascading annotations. Note that I don't need support for locking,
> just LockOptions.NONE as a trick to attach the full graph.
> 
> Better ideas?
> 
> Sanne
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