Paul Worrall wrote:
Hi,
I am passing a serialized object through a JMS middleware. This is an object persisted using OJB and the object ends up being 'published' from one JVM and 'subscribed' to from another JVM. I presume because of the caching of persistent objects in OJB changes by the subscriber to the objects persistent state are not being reflected in the publishers side.
Mhh, how is the publisher informed about the changes? Do send the modified objects back? Or does the subscriber write to the same DB as the publisher?
Do I have to turn the caching off to get these database changes to be reflected and how do I do that.
So it seems the subscriber is also updating the db, correct?
In this case you could use optimistic locking to avoid data corruption if the publisher again tries to write to the db.
But this will not automatically refresh the the publisher side instance!
You have to do it manually by:
broker.removeFromCache(instance);
Identity oid = new Identity(instance, broker);
instance = broker.getObjectByIdentity(oid);
Or is there some mechanism that marks cached objects as stale when the state changes in the database without going through the OJB. And how do I do that?
No there is no such mechanism.
cheers, Thomas
Kind regards,
Paul Worrall
Architect | Director
Apcentric Limited
The Soft Science of J2EE Deployment
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