|
midrange.com
Aaron,
I find this really interesting how many sites are doing something similar -
implementing Java/web front ends with business logic in RPG programs - when
we are considering doing the exact opposite. Many of our RPG and other
legacy language programs are now huge, messy and unmaintable. Hence we are
considering rewriting all the business logic into Java code where it will
be nicely organized, use proper data types, inheritance and so on. Then we
would replace the exisiting 'fat' 5250 screens which currently have all the
business logic mixed in by 'thin' 5250 screens which are nothing more than
a UI layer calling the Java business logic in the background to do all the
work.
I'd be really interested to hear from anybody else attempting something
similar.
Regards,
Nigel Gay.
|---------+------------------------------>
| | "Bartell, Aaron L. |
| | (TC)" |
| | <ALBartell@taylorco|
| | rp.com> |
| | Sent by: |
| | java400-l-bounces@m|
| | idrange.com |
| | |
| | |
| | 30/06/2004 12:36 PM|
| | Please respond to |
| | Java Programming on|
| | and around the |
| | iSeries / AS400 |
| | |
|---------+------------------------------>
>--------------------------------------------------------------------------------------------------------------|
|
|
| To: Java Programming on and around the iSeries / AS400
<java400-l@xxxxxxxxxxxx> |
| cc:
|
| Subject: RE: framework question
|
>--------------------------------------------------------------------------------------------------------------|
Interesting that you are using that framework because that is exactly what
we are contemplating right now - having Java front end our business and
call
RPG programs on the back-end. We have a fairly significant investment in
RPG and RPG programmers along with a deadline to replace our existing
business systems in the next 18 months. Replacing a system in 18 months
doesn't leave much time for learning Java, so we are seeing where we can
leverage both RPG and Java.
How exactly are you making the calls to the back-end RPG programs? PCML?
SQL User Defined Functions? We have done both PCML and SQL UDF's with
success but have found there are limitations that make it so you can't just
call any RPG program or service program. For instance, one of the Java
wizards that I was using the other week didn't allow me to get the
pass-back-parm from the RPG sub proc I was calling because only an integer
can be returned (not strings, DS's, etc). When using SQL UDF's you can't
pass by VALUE (at least in my findings).
If you could give us a couple paragraphs on the direction you took I would
be all ears!! :-)
Aaron Bartell
-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx
[mailto:java400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Ashish Kulkarni
Sent: Wednesday, June 30, 2004 9:43 AM
To: Java Programming on and around the iSeries / AS400
Subject: Re: framework question
Hi
I have developed similar kind of project using struts, basically all the
business logic is in AS400 RPGLE programs, which are developed as API, I
have jsp as front end which displays data, and then calls Action class in
struts framework(which is a
servlet) which calls a java class(to achieve MVC do not call RPG program
from servlet) which calls RPG program using JT400 it is working fine Ashish
--- Christian Geisert <christian.geisert@xxxxxxxxxxx>
wrote:
> [..]
>
> > The coding required to maintain the information
> for each screen and user
> > navigation is not trivial and any suggestions on
> frameworks or new ways of
> > thinking about these issues would be very helpful.
>
> You might have a look at Cocoon[1], especially at Flow[2],[3].
> I did not have time yet to play with it but it sounds nice.
>
> Christian
>
> [1]http://cocoon.apache.org/
> [2]http://wiki.cocoondev.org/Wiki.jsp?page=Flow
>
[3]http://www.webweavertech.com/ovidiu/weblog/archives/000042.html
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