Re: newbie q #2: how to use value objects?

On Tue, 21 Oct 2003, Eivind Waaler wrote:

> Hi Mike.
> 
> I suggest you try obtaining the VALUEOBJECT_REFACTORING_BRANCH from the
> Middlegen cvs. This has been modified with support for value objects and
> session bean facades. It is by far a perfect implementation of value

Hmm, this could get misunderstood. I meant far from perfect.. Tired in the
morning.. :-)

.eivind

> object support, but might take you a step further..
> 
> I'd be interested in any changes or suggestions you would have in this :-)
> 
> CVS info here:
> http://sourceforge.net/cvs/?group_id=36044
> 
> Let me know if you have any problems..
> 
> .eivind
> 
> On Sat, 18 Oct 2003, Michael Harm wrote:
> 
> > Hi again.
> > 
> > I've been using dataobjects with middlegen/ejbdoclet (jboss 3.2.1, 
> > oracle 9i), but I find that often in my session beans I'd like to be 
> > able to optionally stick in references to other data objects that have 
> > an fk relationship to my object.  For instance, if a Person bean has a 
> > set of related Address beans, I'd like it to not only have the field in 
> > AddressData for the person pk, but also a PersonData member.  When I 
> > need to slap that in, I can, (thereby making a 'heavy' dataobject), or 
> > optionally not (for a 'light' one).
> > 
> > Value objects in xdoclet/ejbdoclet seem the thing to use.  But I'm 
> > having a hard time integrating the standard middlegen stuff with that.  
> > ejbdoclet wants @ejb.value-object tags in the comments for cmr  fields 
> > to create the objects; otherwise I just get the column fields and 
> > that's no better than what the dataobject guy gives me.  But middlegen 
> > doesn't seem to want to create these tags for the cmr objects (like, in 
> > the comments above the generated 'getFooByBarId' things in the entity 
> > bean). I can make merged files for the column field accessors, but it 
> > doesn't end up in the object reference accessors like 'getFooByBarId'.  
> >   I tried hacking the velocity template to stick 'em in there, and told 
> > the valueobject directive in ejbdoclet to suffix them with "Data" and 
> > not "Value", and that compiles, but the resultant value objects have 
> > references to Local beans, not other value objects.  In other words, my 
> > AddressData guy has members like PersonLocal, not PersonData.  Which 
> > means I can't use them outside a transaction context, which is the 
> > whole reason I want to use value/data objects in the first place.
> > 
> > So there's probably something very simple that I'm missing here.
> > 
> > I understand that the whole value object thing is undergoing a major 
> > refactoring, and there's an effort to replace dataobjects with 
> > valueobjects entirely.  What's the status of that?  Is there a pointer 
> > to info about it?  The user mailing list has only a couple references 
> > to it. Is that the animal I want to be looking at?  Should I check out 
> > that branch in cvs, or is it still undergoing major development?
> > 
> > Or should I just try my hand at butchering xdoclet's template for data 
> > objects to make it also include private fields, getters and setters for 
> > referenced objects (like PersonData in the example above), and call it 
> > a day?  Pretend that I never heard about value objects, and instead 
> > have it generate extended data objects?
> > 
> > Thanks for any info!
> > 
> > cheers,
> > 
> > Mike Harm
> > 
> > 
> > 
> > 
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> 
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