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I'm with Brian...

Move the logic to a procedure, modify the existing "black box" program to
be a simple *PGM wrapper of the procedure call.

However, I'm not sure I'd bother to do this unless necessary. Necessary in
my mind:
1) Needing to make changes to the black box logic
2) New code could benefit from taking advantage of procedure return values.

Charles

Charles



On Mon, Jul 21, 2014 at 10:11 AM, Brian May <bmay@xxxxxxxxxxxxxxxxx> wrote:

The least disruptive way would be to extract the logic into procedures in
a service program. Then modify your black box program to call these
procedures. That way, new programs get the flexibility of using ILE, but
your existing programs can continue to call the "black box" without change.

As to the benefit, that is subjective. Multiple variable scopes is
usually enough to justify it for me personally. Also, if you never advance
your existing codebase, your new development will always be held back by it.

Brian May
IBM i Modernization Specialist
Profound Logic Software
http://www.profoundlogic.com
937-439-7925 Phone
877-224-7768 Toll Free



Modernization Made Easy!
www.profoundlogic.com



-----Original Message-----
From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Jeff
Young
Sent: Monday, July 21, 2014 8:46 AM
To: Midrange Systems Technical Discussion; RPG programming on the IBM i
(AS/400 and iSeries)
Subject: Service Program or Stand Alone

All,
(Cross Posted to Midrange Systems / RPGLE) I have a number of systems that
are mainly written in RPGLE that were converted from prior versions of RPG
(RPG/36, RPG400) to the current RPGLE format, but most not using any ILE
functions.
I have a number of "Black Box" programs that are called to preform a
specific function and return values.
Newer programs are being written that *do* use ILE functions (where
appropriate).
In these programs, it is often necessary to call some of these "Black Box
programs".
Is there any benefit to converting them to Service Programs?
If so, what would be the best method to use to avoid having to recreate
the 100's if not more existing programs that currently call them as a stand
alone program?

I am just asking for my own information, but am very interested in all
suggestions.

TIA,


Jeff Young
Sr. Programmer Analyst
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