bijection for entity beans

patrick_ibg Oct 8, 2005 12:59 AM

I read from the docs that @Entity components cannot take part in bijection. Is this by design, or an EJB restriction? I can see a use case for allowing bijection for entities:

@Entity
@Name ("user")
@Scope (SESSION)
public class User {
 ...
}


@Entity (AccessType.FIELD)
@Name ("someObject")
public class SomeObject {

@Transient
@In
private User user ;

@ManyToOne
private User updater ;

@Basic
private Date updateTime ;

@PreUpdate
public void onPreUpdate () {
 this.updater = user ;
 this.updateTime = new Date () ;
}

}

1. Re: bijection for entity beans

gavin.king Oct 8, 2005 3:34 PM (in response to patrick_ibg)

Yes, this is by design, the domain model should not be dependent upon application logic, because the domain model is shared and changes much less often.

Also, entity beans are often instantiated by the application instead of by Seam, and Seam can not then intercept them.
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2. Re: bijection for entity beans

tom_goring Oct 10, 2005 3:16 PM (in response to patrick_ibg)

"gavin.king@jboss.com" wrote:
Yes, this is by design, the domain model should not be dependent upon application logic, because the domain model is shared and changes much less often.

Also, entity beans are often instantiated by the application instead of by Seam, and Seam can not then intercept them.

Hi All,

What would be the best way then to ensure all domain objects when updated get the user id of the user in the session. BiInjection seems a good way to me.

Thanks in advance.
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3. Re: bijection for entity beans

rdewell Oct 10, 2005 11:07 PM (in response to patrick_ibg)

Tom, maybe you could try something like:

@PreUpdate
public void updateMyUserId(){
MySessionBeanInterface b = Component.getInstance(MySessionBean.class, true);
this.setUserId(b.getCurrentUserId());
}

The "Component" class is a Seam class: org.jboss.seam.Component. Basically, you're mainly performing the "injection" / object lookup programmatically.

Ryan
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4. Re: bijection for entity beans

gavin.king Oct 11, 2005 5:50 AM (in response to patrick_ibg)

IMO, the best way is to do all that kind of thing from that action listener method.
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