Re: ServicePrograms VS normal Programs

["Uros Davidovic" <Uros_Davidovic@xxxxxxxxxxx>]

Cak i na razlicitim kontinentima, matori programeri su isti, drugim 
recima koriste i dalje manje vise RPG3, a ne nove tehnike... 

Razlika je ovakva:
mnogo je bolje sto se tice performanse ici na callp i service program i 
koristiti ovo kao funkcije nego zvati obicne program sa call. Razlika je 
jednostavna u tome sto kad ti napravis call, program ide kroz library 
list i mora da resolve reference znaci sve je radjeno dinamicki (dobar mi 
je srbglish ili kroglish ;)). Kada uradis callp, kako je service program 
bound sa tvojim programom pri kreaciji, sve reference na externe funkcije 
se resolve u to vreme. Znaci, lokacija u memoriji tvoje subprocedure je 
vec poznata i nema potrebe da se trazi... Takodje, videces da mozes da 
koristis passing parameters izuzetno efikasno, koristeci koncepte koji su 
ti verovatno vec poznati kao oo programmeru kao passing by value ili 
passing by reference ili ima i treci u RPGju sto je passing by constant 
(read only reference)... takodje, funkcije su mnogo elegantnije da se 
koriste narocito u free form coding sa RPGjem i vracaju vrednosti, sto 
obican program radi, ali sve ide kao pass by reference ako uradis call sa 
parmima... Hope that helps...

Regards,

Uros Davidovic
Lead Analyst/Project Manager
Computer Aid, Inc.
Office: 717.651.3277


-----Original Message-----
From: Igor.Beslic@xxxxxxxxxxxx
To: rpg400-l@xxxxxxxxxxxx
Date: Thu, 26 Aug 2004 15:34:58 +0200
Subject: ServicePrograms VS normal Programs

> Hello everybody!
> 
> I read some articles abouth service programs and now I am wondering is
> it 
> better to make a service program with collection of subprocedures that 
> will be repeatedly called (with callP) from other programs, or is it 
> better to have every subprocedure as one rpg program (and call it with 
> call). What is diference in performance? What is exactly happening when
> an 
> program calls subprocedure from service program with callP and what is 
> happening when program calls another program with call and parametar
> list.
> 
> I am asking this because I am Java programer and fresh RPG programer
> and 
> most of RPG things I learned from IBM's student books and Sourcers
> Guide, 
> but my collegues (who code in RPG all their life) have totaly diferent 
> aproach that doesn't meet any ruels (described in RedBook) of advanced
> and 
> modern coding.
> 
> Thanks, Igor. 
> --
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