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List:       ojb-user
Subject:    Repost: OTM & PBLifeCycleListener
From:       Sebastian <nospam_st () gmx ! net>
Date:       2004-10-28 21:01:44
Message-ID: clrmnn$hgo$1 () sea ! gmane ! org
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Hi,

my basic question is, how can I have object properties auto updated on 
insert, update or delete. Not only in the object instance that is 
internally hold by OJB/OTM but also in the object instance on which the 
OTMConnection.makePersistent method is called. I know that it's fairly 
easy to create could create a delegate method and encapsulate the 
makePersistent method and manually set the properties when an object is 
persisted but this gets quite tricky when the object has references to 
other persistable objects that are auto-persisted too. In this case it 
would be great to use the PBLifeCycleListener events which obviously 
don't work for the object instance handed over to the makePersistent method.

Thanks for any ideas.

Sebastian wrote:
> To persist objects I'm using the OTM.
> 
> I have a class like this:
>   class DataRecord {
>     int id;
>     Date lastModified;
>   }
> 
> and a PBLifeCylceListener added like this:
> 
> OTMConnection conn = 
> SimpleKit.getInstance().acquireConnection(PersistenceBrokerFactory.getDefaultKey()); 
> 
> ((BaseConnection) conn).getKernelBroker().addListener(
>   new PBLifeCycleListener()
>   {
>     public void beforeInsert(PBLifeCycleEvent event)
>     throws PersistenceBrokerException {
>       DataRecord rec = (DataRecord) event.getTarget();
>       rec.lastModified = new Date();
>     }
> 
>     public void beforeUpdate(PBLifeCycleEvent event)
>     throws PersistenceBrokerException {
>       DataRecord rec = (DataRecord) event.getTarget();
>       rec.lastModified = new Date();
>     }
>   }
>   ...
> );
> 
> After persisting the myDataRecord object using 
> conn.makePersistent(myDataRecord) the object's propery "lastModified" 
> still has the same value as before persisting it.
> 
> I can retrieve a new object copy with conn.getObjectByIdentity(...) and 
> the property "lastModified" has the updated value. But I'd like to have 
> the "lastModified" property updated automatically in the object that I'm 
> passing to the conn.makePersistent(...) method. Any ideas?
> 
> Thanks in advance,
> Sebastian


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