RE: Convert from free to fixed

Vincent;

This is from the archives.

http://archive.midrange.com/rpg400-l/200507/msg00951.html

Duane Christen


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Duane Christen
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Duane.Christen@xxxxxxxxxx

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-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of vforbes@xxxxxxxxx
Sent: Wednesday, September 29, 2010 4:00 PM
To: RPG programming on the IBM i / System i
Subject: Re: Convert from free to fixed

I would like to learn more about the "condition handler". Can you give me more info about this. {examples, links}

Vincent Forbes

... monitor is your friend

and a condition handler is your BEST friend.

The *PSSR subroutine is archaic and not a good solution when managing
application errors that run on a web server. I would strongly suggest
using condition handlers for this as you have MUCH more control over
how to proceed. Further, *PSSR is an 'after the event' clean-up
routine. Not only has the exception been thrown but it has percolated to the control boundary, promoted to a function check (CPF9999) and the condition manager is now looking for somebody to shoot.

Condition handlers beat monitor because monitor will handle any
exception thrown within the monitor group. Condition handlers work even better than MONMSG because you can choose to handle the exception based on any criteria you wish.
Also, the condition handler is called BEFORE the original *ESCAPE or
*NOTIFY message has reached the control boundary so the call stack is
pristine. You can write code in your condition handler to pause the
process so you can debug the problem. I have been able to recover from divide by zero, substring length and array index errors this way. The process continues from the next line of code as if nothing went wrong. You can't beat that!

I genuinely believe it is one of the many unsung heros of ILE.

Cheers

Larry Ducie

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