Re: Pattern BusinessDeligation

BusinessDelegates cannot be packaged with ejb-jars file: The Delegates
belong into the Client-Tier - whatever this client-tier may be: As they
are the place, where you put client-specific requirements for accessing
Distributed Logic (eg. Caching, Multi-Threading Abilities/Disabilities,
Handling Network Congestions), you will probably end up with different
Delegates tailored to the specific needs of your Client-Platform.

So:
- putting the Delegate into the ejb-jar is not an option, as the
Delegate is on the clients side of the Business Tier
- putting them into the web-inf/lib may be in option when you only have
one web-app accessing your Business-Logic
- jaring them up with your Home/Remote-Interfaces may be a good
distribution idea: But in the End the Delegate and the Interface to your
Business-Logic may evelove in different speeds: For the Proxy-Flavour of
the Delegate, the Interface look equal most of the time, but when you
use a Delegate as an Adapter, you may want to have your Delegate look
very different from the BusinessLogic it access - So packaging them
together produces unwanted ties.
- adding it to it to the manifest of your ear to make it available to
more than one web-app is an option for webapps.

Packaging for other (richer) Clients than just web-apps still seems to
be an open issue: The Client-Provisioning Spec is still work-in-progress
- and this may shed some light on these issues
http://java.sun.com/j2ee/provisioning/

greetings
stf

Giovani Salvador wrote:
> Ok, didnï¿½t think about the distribution question.....Thanks
> But i think there are other ways to do that, like exposing your
> businness delegate as a rmi server. Anyway, your clients will have to
> have the stubs..
> But the simplest way is just putting the component with war file, swing
> application.....
>
>
>
> ----- Original Message -----
>
> *From:* Madhu V <mailto:madhu.v@(protected)>
> *To:* J2EEPATTERNS-INTEREST@(protected)
> <mailto:J2EEPATTERNS-INTEREST@(protected)>
> *Sent:* Thursday, July 31, 2003 10:11 AM
> *Subject:* Re: Pattern BusinessDeligation
>
> Hi Giovani Salvador,
>
> Yaa i am talking about BusinessDeligation only. See if you put your
> business deligation class in ejb's jar file, then how your JSP and
> Servlets can create instances of businessdeligation?. Your business
> deligation will do lookup for EJB's. So it should be in .war file only.
>
> Thanks
> Madhu V
> ----- Original Message -----
>
> *From:* Giovani Salvador
> <mailto:giovani-salvador@(protected)>
> *To:* J2EEPATTERNS-INTEREST@(protected)
> <mailto:J2EEPATTERNS-INTEREST@(protected)>
> *Sent:* Thursday, July 31, 2003 6:30 PM
> *Subject:* Re: Pattern BusinessDeligation
>
> Are you talknig about businness delegate design pattern? AFAIK,
> you put businness delegate in front of your businness
> components, the ejb components in your case. I think itï¿½s more
> clear to put your businness delegate in the same environment
> that your ejbï¿½s are.
> Imagine that your ejb components will be called now from a swing
> application and not from a web client. You will not distribute
> your businness delegate component with each client that will
> access your businness components, ok?
>
> Giovani Salvador
>
>
> ----- Original Message -----
> *From:* Madhu V <mailto:madhu.v@(protected)>
> *To:* J2EEPATTERNS-INTEREST@(protected)
> <mailto:J2EEPATTERNS-INTEREST@(protected)>
> *Sent:* Thursday, July 31, 2003 8:09 AM
> *Subject:* Pattern BusinessDeligation
>
> Hi All,
>
> When implementing business deligation in J2EE Application
> where my jar of Enterprise JavaBeans (EJB's) will
> be deployed in one system and my war file will be deployed
> in other system, where exactly i put my businessdelegate
> classes?. Am i right if i put those classes in .war file?
>
> Can anybody clarify my Question
>
> Thanks in Advance
> Madhu V
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Re: Pattern BusinessDeligation

Stefan Frank

2003-07-31