Audit Interceptors

bobisshort · **Joined:** Wed Sep 17, 2008 11:32 pm **Posts:** 2

Hi,

I want to automatically add some audit information when saving data (create_user, create_date, update_user, update_date, etc.).

I've seen some example of using an intercepter to add this information to persistant classes.

No problem there.

My question is this: is there a way to automatically add audit information to relationship tables?

Since the relationships are not actually modelled as entities the intercepter never get's fired for them.

Is there a clean way to do this?

carlolf · **Posted:** Thu Sep 18, 2008 3:11 am

The interceptor is fired not for the relationship, but for it's owner. Say, an order object has line items, then if you add a line item to the order, the relationship from order to it's line items changes. If you modelled the order to have a collection of line items (Set, List), you will get the previous state of the variable holding the collection, and then you can call:

Code:

PersistentCollection col = (PersistentCollection)previousState[i];
Serializable s = col.getStoredSnapshot();   

bobisshort · **Joined:** Wed Sep 17, 2008 11:32 pm **Posts:** 2

Thanks Carlo.

Once I have the persistent collection is there a way to add audit information to it?

Or is the pattern to update the parent audit information whenever a relationship is modified?

dhukas · **Joined:** Sun May 08, 2005 12:26 pm **Posts:** 10

Hi Carlo,

it seems as if you have found an answer to your own question in http://forum.hibernate.org/viewtopic.php?t=985118 - would be nice if you could give some more details!

Given the "stored snapshot", how can one figure out the changes? Does it work for collections of entities only? Than what about collections of (composite) elements (-> @CollectionsOfElements, @Embeddable) - can they also be handled that way?

Regards
Burkhard