Re: Cleanup after program failure

[Matthias Oertli <oertlim@xxxxxxxxxxxxxxxx>]

Hi,
Thanks for all the suggestions.
Because I only have no control over program B, I decided to start it
in a group job. Program A puts parameters into the *GDA. I wrote a
small CL as the initial program on a TFRGRPJOB that retrieves the
parameters from the *GDA, modifies the environment and calls program B
appropriately. Now even if there are problems with program B (which I
don't care about), the worst that can happen is that the group job
terminates. Program A still has the proper environment.

This raises one further question though: Is it possible to read/write
the *GDA from a RPG program (using IN/OUT)? It works for the *LDA but
I can't figure it out for the *GDA.

Thanks for all the replies.
Best regards,
Matthias

Buck Calabro wrote:
> 
> Matthias Oertli wrote:
> 
> >I've been asked to code a call to program B from within program A.
> -snip-
> >My problem is this: If program B (or the CL) fails for whatever
> >reason, program A regains control without the environment having been
> >restored to what it should be which could mean disaster.
> >
> >How can I guard against this situation?
> 
> I would write the cleanup functions as a separate program/procedure; ideally
> I'd include the "set up" and "remove" functions in one procedure and call it
> with a parameter that tells it which to do.  That way all your environment
> manipulation is done in one place.
> 
> Once you have that, have A call B and have B pass back a "success/fail"
> flag.  Use whatever error trapping you need in B.  If B fails completely, A
> can still check the return code.  If it is not set for "success"  have A
> call the environment restore procedure.  If B completes, have it call the
> environment restore procedure.
> 
> If you will be needing to do a lot of this, I would make a small change and
> write an "environment save" procedure and an "environment restore"
> procedure.  A does the save, B does the set, A does the restore.  That way A
> is responsible for its own environment...
> 
> I hope these ideas get you started in a direction that will work for you!
> 
> Buck Calabro

-- 

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Matthias Oertli   <oertlim@s054.aone.net.au>
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