I'm not certain that file encapsulation directly leads to MVC, especially in RPG. Perhaps I once again have the wrong idea of MVC implementations in RPG, but what we're talking about specifically is the M in MVC. The model...

The model contains functions that perform work. These functions might be I/O consumers (reading data from DB2), or might just invoke a calculation or algorithm. In any case, the developer requests a function or series of functions to produce a result.

The view is simply the DSPF. It provides the UI.

The controller is the RPG program that operates between the DSPF and the Service Programs that contain your functions. Controller manages I/O to UI, populating details (from the model) to the view as needed.

So, anybody who has written a program with a DSPF, where all the functions are contained in external service programs or modules has written an MVC application.

IMO, for an RPG developer, getting functions into service programs is the great enabler of MVC, in any flavor...

-Eric DeLong

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of GKern@xxxxxxxxxxxxxxxx
Sent: Wednesday, April 04, 2012 2:56 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: RE: File Encapsulation Quandary

Maybe I'm a bit dense here but I thought in the RPG world file
encapsulation was the mechanism that could lead towards supporting an MVC
architecture and therefore a good thing to strive for.

(Just a comment, not a question.)

Thanks, Jerry

Gerald Kern - Information Technology
Programming Supervisor
IBM Certified RPG IV Developer
Lotus Notes/Domino 8.0.1 Administrator
The Toledo Clinic, Inc.
4235 Secor Road
Toledo, OH 43623
Phone 419-479-5535

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