Re: Hmmmm.....$1 Billion

Hey, never thought of that.

Rob Berendt
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Steve Richter <stephenrichter@xxxxxxxxx> 
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03/04/2005 09:00 AM
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Re: Hmmmm.....$1 Billion






On Fri, 4 Mar 2005 08:26:38 -0500, Jeff Crosby
<jlcrosby@xxxxxxxxxxxxxxxx> wrote:
> > My limited experience is with the very under rated VARPG,
> > which is entirely
> > event driven.   As I worked with VARPG programs on Windows it
> > changed my
> > regular programming style and logic.  While still cycle
> > driven, my 5250 programs now tend to focus on the events that
> > might takle place rather than on the cycle.
> 
> I will now show my ignorance (like you proclaimed a couple of posts ago 
<g>)
> as well:
> 
> 1) I too wonder why The Cycle is never compared to being event driven in
> style.

the way I understand it, events are the equivalent to interupts. Your
program is made aware of something happening compared to your program
checking to see if something happened.  You do that by having your
program loop on a data queue.  External events, like the use clicked
the OK button or the user wants to signoff, are signaled to your event
processing program thru messages in the data queue.

It is a very good programming model.  Once the framework is in place
it is easy to add a new command key or button to the entry form.

an rpg display file program can be written according to the event
model by linking a data queue to the display file.  look at the
Dtaq(xxx) parm of the OVRDSPF command.  The way it works is your
program "invites" a display device to do something ( I dont recall
exactly how it works ), then when the user has pressed the enter key
display data management places an entry on the data queue associated
with the DSPF, your program receives that "event" from the data queue
and executes the read from the display file record to get the entered
display data.

-Steve
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