Re: Service Program or Stand Alone

[Jeff Young <jyoung0950@xxxxxxxxx>]

To everyone that responded, thanks.
As I indicated, this is something I am researching for my own benefit.
I had originally thought along the lines of changing the "OLDPGM" to
"NEWSRVPGM" and creating a new "OLDPGM"  with the original parms and logic
to call procedures in the service program.

It is nice to know that most of the community appears to confirm that *if*
something like this is done (change OLDPGM to NEWSRVPGM) that the above
would be the best method to use.

I will not be changing anything for the sake of change, but if I do need to
add significant new code and/or function, I will keep this in mind.





Jeff Young
Sr. Programmer Analyst


On Mon, Jul 21, 2014 at 12:03 PM, D*B <dieter.bender@xxxxxxxxxxxx> wrote:

> <Jeff Young>
>
>    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?
> </Jeff Young>
>
> Simple technical changes, just for changing it, don't have any benefit,
> but might expose riscs. I would recommend to break the process down to
> steps:
> - provide procedure wrappers for your OPM programm, if you have such an
> animal with function code, one for each code
> seperate in and out parms by defining a returntype (Datastructure) for the
> return values and make the input parameters called by value in the
> prototype. The complete logic remains in your unchanged OPM Programm and is
> called by the new wrapping procedures.
> - in new ILE programms use the wrapping procedures, don't use the OPM
> - in case of changing one of the existing ILE programms, which is using
> the OPM call, change it to use the wrapping procedure.
> - in case of changing the implementing OPM programm, move the logic to the
> wrapping procedures and provide an OPM wrapper for all programms using the
> OPM version.
> - in case of major changes to one of your OPM programms, decide wether it
> coul be worth to migrate the programm to ILE. In this case change the call
> to the OPM function to the procedure version.
>
> Dieter
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