[rules-users] [droolsflow] - one way to use Hibernate mapping with JPAVariablePersister

[Mauricio Salatino]

nice.. do you mind if I commit it to the trunk?
can you create some unit testing too?


On Fri, Oct 23, 2009 at 3:27 PM, Bill Tarr <javatestcase at yahoo.com> wrote:

> Here is an alternate version of JPAVariablePersister for people who are
> already using Hibernate xml mapping files.
>
> This implementation has some downsides, but it seems to be working for now.
>
> I am going to keep using JPA to manage all the Drools Flow tables.
>
> My domain object persistence will be managed by Hibernate Session.
>
> We are also currently using automatic flush (so no code to persist domain
> objects in this class)
>
> Obviously you need to use your own version of HibUtil.
>
> import java.util.logging.Level;
> import java.util.logging.Logger;
> import
> org.drools.persistence.processinstance.variabletypes.JPAPersistedVariable;
> import
> org.drools.persistence.processinstance.variabletypes.VariableInstanceInfo;
> import org.drools.persistence.processinstance.persisters.VariablePersister;
> import org.drools.runtime.Environment;
> import org.hibernate.Session;
> import HibUtil;
> /**
>  * Variation on Drools JPA Variable Persister.
>  * org.drools.persistence.processinstance.persisters.JPAVariablePersister
>  * for using variables persisted by Hibernate, while still using JPA to
>  * persist DroolsFlow data.
>  *
>  * @author <a href="mailto:kris_verlaenen at hotmail.com">Kris Verlaenen</a>
>  * @author salaboy
>  */
> public class JPAVariablePersisterHibernate implements VariablePersister {
>  public VariableInstanceInfo persistExternalVariable(String name, Object o,
>    VariableInstanceInfo oldValue, Environment env) {
>                 if(o == null || (oldValue != null &&
> oldValue.getPersister().equals(""))){
>                     return null;
>                 }
>   try {
>    JPAPersistedVariable result = null;
>    if (oldValue instanceof JPAPersistedVariable) {
>     result = (JPAPersistedVariable) oldValue;
>    }
>    if (result == null) {
>     result = new JPAPersistedVariable();
>    }
>    Long idValue = geHibIdValue(o);
>    result.setPersister(this.getClass().getName());
>             result.setName(name);
>    result.setEntityId(idValue);
>    result.setEntity(o);
>    result.setEntityClass(o.getClass().getCanonicalName());
>             return result;
>   } catch (Throwable t) {
>    Logger.getLogger(JPAVariablePersisterHibernate.class.getName())
>     .log(Level.SEVERE, null, t);
>    throw new RuntimeException("Could not persist external variable", t);
>   }
>  }
>  public Object getExternalPersistedVariable(
>    VariableInstanceInfo variableInstanceInfo, Environment env) {
>         if(((JPAPersistedVariable) variableInstanceInfo) == null ||
> ((JPAPersistedVariable) variableInstanceInfo).getEntityId() == null){
>             return null;
>         }
>         System.out.println("Restoring JPAPersistedVariable id=" +
> ((JPAPersistedVariable) variableInstanceInfo).getId() + " entityId=" +
> ((JPAPersistedVariable) variableInstanceInfo).getEntityId() + " class=" +
> ((JPAPersistedVariable) variableInstanceInfo).getEntityClass() + " value=" +
> ((JPAPersistedVariable) variableInstanceInfo).getEntity());
>   String varType = ((JPAPersistedVariable)
> variableInstanceInfo).getEntityClass();
>
>         Object obj = HibUtil.getCurrentSession().get(varType,
> ((JPAPersistedVariable) variableInstanceInfo).getEntityId());
>         HibUtil.closeCurrentSession();
>         return obj;
>  }
> /**
>  * Hibernate lookup to get ID column.
>  * @param o Dto to look up.
>  * @return Long id.
>  */
>  private Long geHibIdValue(Object o)  {
>         Session session = HibUtil.getCurrentSession();
>         return (Long) session.getIdentifier(o);
>  }
> }
>
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>



-- 
- http://salaboy.wordpress.com
- http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20091023/901bef26/attachment.html