Assaf Arkin wrote:
> OrgUnits should point back to the Organization entity bean instance. You
> have two classes referencing each other.
>
> Do not use references or handles, the EJB server might replace them with
> a different instance so an OrgUnit might point to a different
> Organization at different times.
>
> Although this should never be a problem (at least not in this example),
> you might have some dependency there at the point of load/store that
> might break.
>
> arkin
Please could you be more precise. Wich dependency problems might occur if the
container replace the "org" refernce in the OrgUnit class (see bellow) with a
logically equivalent one? How can these disturb load/store? What should be used
instead (of references and handles)? (home_handle + prim_key, home_name +
prim_key, ..?)
Thanks.
Francis.
>
>
> Laird Nelson wrote:
> >
> > Not the usual, I promise.
> >
> > I have an Organization. It is an EntityBean. It wholly contains
> > OrgUnits. They are not enterprise beans since they are dependent
> > objects, and since it appears like a Good Thing to reduce the number of
> > EntityBeans needed in an architecture.
> >
> > But now each OrgUnit logically needs a reference back to the
> > Organization that owns it. Can I simply keep a reference to the
> > Organization that creates an OrgUnit? Should I store the handle
> > instead? Or the OrganizationHome? Or what?
> >
> > Sample, shortened code follows:
> >
> > // Remote reference for OrganizationBean class--
> > // the OrganizationBean class implements EntityBean.
> > public interface Organization extends EJBObject {
> > public OrgUnit[] getOrgUnits();
> > }
> >
> > public class OrgUnit {
> >
> > // OK? Bad? Organization is an EJBObject.
> > // Does this matter?
> > private Organization org = null;
> >
> > public OrgUnit(Organization org) {
> > super();
> > this.org = org; // OK? Bad?
> > }
> >
> > public Organization getOrganization() {
> > return this.org; // OK? Bad?
> > }
> >
> > }
> >
> > Cheers,
> > Laird
> >
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>
> --
> ----------------------------------------------------------------------
> Assaf Arkin www.exoffice.com
> CTO, Exoffice Technologies, Inc. www.exolab.org
>
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--
Francis Pouatcha
MATHEMA Software GmbH
http://www.mathema.de
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