Alex,
O/T a bit for this thread but possibly of interest.
If you're not already aware of it, Eric Pugh wrote a hibernate component
for ECM which, I believe, is on the Hibernate site.
Regards,
Peter
On Sat, 2003-11-01 at 09:14, Alexis Agahi wrote:
> Hi,
>
> As I'm now using hibernate on current biz project, some ideas come to my brain
> about how could have transparent persistence with avalon compenent.
>
> Based on hibernate (JDO?) approach that all object could be mapped in database
> with get/setter method to populate the object field from db (or persist state
> to db), any component could support such feature.
>
> The main problem would be how manage compenent persistance.
> I have a suggestion: via a Persitence interface that could be added in
> component lifecycle.
>
> such as
> public interface Persistence
> {
> public void persitence( PersistenceManager persistenceManager );
> }
>
> PersistenceManager class would manage object persistance/lookup(load) and
> transaction provider.
>
>
>
> For exemple:
>
> Let say we have a persistant component called "Foo"
>
> /**
> * @avalon.component version="1.0" name="Foo" lifestyle="transient"
> * @avalon.service type="Foo"
> */
> public class Foo implements (AvalonFrameWorksStuff)
> {
> Long m_primaryKey;
> String m_value;
> ....
>
> public void setId( Long id )
> {
> m_primaryKey = id;
> }
> public Long getId()
> {
> return m_primaryKey;
> }
>
>
> public void setValue( String value )
> {
> m_value = value;
> }
> public String getValue()
> {
> return m_value;
> }
> }
>
> We suppose that this object is mapped in db using persistence mapping
> descriptor (such as hibernate or jdo) file.
>
>
> Now we have a compenent Bar depending on Foo
>
> /**
> * @avalon.component version="1.0" name="Bar" lifestyle="transient"
> * @avalon.service type="Bar"
> */
> public class Bar implements
> Servicealbe, Persistence
> {
> String m_serviceManager;
> ....
> /**
> * @avalon.dependency type="Foo:1.0" key="Foo"
> */
> public void service( ServiceManager serviceManager)
> throws ServiceException
> {
> m_serviceManager = serviceManager;
> }
>
>
>
> public void persitence( PersistanceManager persistanceManager ){
>
> PrimaryLookupCriteria criteria = new PrimaryLookupCriteria( new Long(
> 1 ) );
> Foo foo = persistanceManager.lookup( m_serviceManager, "Foo", criteria
> );
>
> getLogger().info( foo.getValue() );
>
> Transaction = null;
> try{
> tx = persistanceManager.getTransaction();
> foo.setValue( "Dude!" );
> tx.save( foo );
> tx.commit();
> }
> catch( TransactionExcetion te )
> {
> tx.rollback();
> }
> finally
> {
> if( tx != null ) tx.close();
> }
>
>
> }
>
> }
>
>
>
>
> Cheers
>
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--
Peter Courcoux <[EMAIL PROTECTED]>
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