Re: EJB versus RPG/COBOL

[Ivan Hurtado <iva030@xxxxxxxxx>]

With 500 users, I need the application itself to
perform as fast as possible. I do not want to complete
this project and have the application performance be
so bad that the users hate it. There is enough
politics already regarding the replacement of the
existing app, and I definitely want performance and
functionality to supercede everything else. 

--- Dieter Bender <dieter.bender@xxxxxxxxxxxx> wrote:
> Ivan,
> 
> it depends on, what performance you try to optimize,
> performance of machine 
> (as400) or performance of programmer
> (maintanability).
> 
> If you want to optimize performance on as400 by
> minimizing the hardware 
> effort, then rpg would be the fastest, even cgi
> might be faster than JSP and 
> Servlets.
> If you want to optimize programmer performance and
> maintainability then a pur 
> java solution with JSP and an appropriate Framework
> like Struts and use of a 
> persistance Framework would be best. If you want to
> run this all on as400 it 
> will tend to be slower than rpg and the hardware
> effort is higher (another 
> poster estimated * 5)
> Mixing RPG and Java is worst for maintainability,
> you will need both skills 
> forever and your Java design is driven by rpg
> prerequisites.
> 
> Dieter
> 
> On Dienstag, 9. März 2004 22:45, Ivan Hurtado wrote:
> > In Don Denoncourt's book titled "iSeries & AS400 -
> > Java at Work", he states the following...
> >
> > "I see two alternatives when using Java for AS/400
> > applications: one is to use RPG/COBOL for your
> > business logic, and the other is to use EJB. In
> either
> > scenario, you'd use JSP and Servlets to handle the
> web
> > interface."
> >
> > I am designing a server side app, that will reside
> > completely on one single AS400 machine. This
> > application may be accessed by up to 500 users.
> This
> > is the first time I design a Java app for an
> AS400, so
> > I am considering all the choices. Does anyone know
> > what the pros & cons of the two alternatives
> > (RPG/COBOL vs. EJB) that Don Denoncourt mentions
> are?
> > My main concern is performance and speed of the
> > app/system (I am not concerned about the
> > cross-platform issue at all in this case). I hear
> that
> > java on as400 is NOT exactly lightning fast. Will
> > using RPG for the Business Logic improve
> performance?
> > It sounds like using RPG alleviates the system
> level
> > concerns that EJB is supposed to help with (db
> > persistence, transactin control, scalability,
> etc.).
> > It also sounds like using RPG "could be" faster
> since
> > RPG does not incur the cost of all the java object
> > creation & garbage collection. For sure, it would
> help
> > with coding of the new system since we have
> several
> > legacy RPG developers and no other Java types here
> but
> > me.
> >
> > Thoughts anyone?
> >
> > Thanks,
> > Ivan
> >
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> -- 
> mfG
> 
> Dieter Bender
> 
> 
> DV-Beratung Dieter Bender
> Wetzlarerstr. 25
> 35435 Wettenberg
> Tel. +49 641 9805855
> Fax +49 641 9805856
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> eMail dieter.bender@xxxxxxxxxxxx
> 
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