RE: Separation of Presentation, BL, and I/O Tiers

["Smith, Nelson" <NSmith@xxxxxxxxxxx>]

Currently my presentation tier (programs and display files) call I/O modules
directly.

I have the requesting program setup an externally defined MODS for however
many records it wants and then it passes a pointer to that MODS as a parm to
the I/O module.  Any keys, etc, entered on the screen would be put in the
first occurrance of the MODS. The I/O module then sets up a similiar MODS
and positions it at the incoming pointer and uses the key fields in the
first occurrance.  It works fine, but I'm not entirely happy with it.

I would prefer for the I/O module to create a structure large enough to hold
however many records it finds and then pass a pointer to this structure back
to the calling program along with the number of records it found.  In other
words, I think it would be better if the calling programs did not have to
predetermine the number of records.  To implement this now, however, would
be a reversal of logic on my existing programs, so it will probably have to
wait for a new project where I can start fresh.

There seems to be ongoing debate on this list as to whether or not MODS can
be dynamically sized or not, like arrays.  I've seen several posters saying
they could, but have seen no examples of that, yet.  Short of that, to
implement my desired change, I would probably have to resort to Arrays
instead of MODS so that the I/O routine could set the size as needed.

> -----Original Message-----
> From: MWalter@hanoverwire.com [SMTP:MWalter@hanoverwire.com]
> Sent: Wednesday, April 10, 2002 11:55 AM
> To:   rpg400-l@midrange.com
> Subject:      RE: Separation of Presentation, BL, and I/O Tiers
>
>
> On number 3, What I meant is How do I get the data from the presentation
> tier to the I/O tier. I have tested using both data queues and passing
> data
> structures. Here again the best answer is probably 'It Depends'
>
>
> Thanks,
>
> Mark
>
>
> Mark Walter
> Sr. Programmer/Analyst
> Hanover Wire Cloth a div of CCX, Inc.
> mwalter@hanoverwire.com
> http://www.hanoverwire.com
> 717.637.3795 Ext.3040
>
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