Hi Gene,
Do you have any design pattern for such an
architecture? Or do you care to share your
architecture design on dynamically add or remove
fields to the entity beans?
Thanks
--- Gene Chuang <[EMAIL PROTECTED]> wrote:
> Current CMP specs do not allow dynamic modification
> of entity bean metadata
> (add/remove fields). HOWEVER, you CAN mock this
> with BMP if you design your
> BMP beans well enough. And obviously your bean
> interface will only have
> abstract getter/setter/finder
> (getValue/setValue/findValue) that takes
> parameterized constraints. Once again this is
> do-able, but require some
> careful architecting.
>
> Alternatively you can just use solely session beans
> and value-objects; this
> way you can change the metadata at any time.
>
> Gene
>
> -----Original Message-----
> From: A mailing list for Enterprise JavaBeans
> development
> [mailto:[EMAIL PROTECTED]]On Behalf Of S.
> von Knellehekje
> Sent: Monday, April 09, 2001 3:53 AM
> To: [EMAIL PROTECTED]
> Subject: How to allow easy addition of fields to a
> bean.
>
>
> 'Ello,
>
> I'm writing some support software and want to use
> EJB and a 3-tier model,
> because I think that the best option. I can't,
> however, figure out how to
> allow the users of the software to add fields to the
> beans in the datalayer
> without having them to rewrite my beans.
>
> My first guess was to use extension of my databeans
> but that means chancing
> the type of the variables used to store the home and
> remote interface's in
> my 2nd tier (or doesn't it?) and rewriting the home
> interface because of the
> return types of the create method and some of the
> findBy methods.
>
> I think this is quite a common problem, but I can't
> seem to find anything on
> how to solve it. Can anybody tell me how to tackle
> this or point me to some
> possible solutions / resources?
>
> Thanks a lot,
>
> Sandigo.
>
>
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=====
PiFen Ellwood
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