Re: Trigger Processing Question

[Charles Wilt <charles.wilt@xxxxxxxxx>]

If you do it this way, expect poor performance when the trigger is
fired multiple times in a single job...

ie. a batch update on the triggered file.

Particularly if the program is in RPG IV (RPG IV dynamic call is more
costly than an RPG III dynamic call)

Alan's trigger mediator would be a better choice IMHO...it includes
functionality to let you tell the trigger to reload a newer version.

Charles

On Fri, Jun 17, 2011 at 1:11 PM, Jeff Young <cooljeff913@xxxxxxxxx> wrote:
> Thanks Paul,
> I was not sure if that would work.
>
> Since the batch job is library list dependent, I could have multiple copies
> running with different job names that are identified by the environment.
> If I setup a new enviornment, I would have to create a new prestart job entry
> for it.
>
> I appreciate all of the suggestions that I have received and will use Paul's
> suggestion to make it a dynamic call.
>
> Quick question:
> The trigger program is Free Form RPGLE and I had been using a prototype with
> EXTPGM.
> How can I make this into a dynamic call instead of static?
>
> Thanks,
>
>
> Jeff Young
> Sr. Programmer Analyst
>
>
>
>
>
>
> ________________________________
> From: "Morgan, Paul" <Paul.Morgan@xxxxxxxxxxx>
> To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
> Sent: Fri, June 17, 2011 12:58:14 PM
> Subject: RE: Trigger Processing Question
>
> Jeff,
>
> To answer your question:
>
> 1) Make sure you are making a dynamic call to the program
> 2) Make sure the program shuts down after every call so it's no longer in the
> call stack of the process
>
> Then when you call the program again in the same process you will call the
> current version.
>
> Have you looked at a prestart job entry in that subsystem for your process or
> processes that receives the data queue entry?  Those can get automatically
> restarted by the subsystem if they ever end.
>
> Paul Morgan
>
> Principal Programmer Analyst
> IT Supply Chain/Replenishment
>
>
> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx]
> On Behalf Of Jeff Young
> Sent: Friday, June 17, 2011 12:30 PM
> To: Midrange Systems Technical Discussion
> Subject: Re: Trigger Processing Question
>
> Paul,
> I still need to know if the program that receives the data queue entry is
> active.
> This will be a program running in a NOMAX jobs subsystem, but needs to be
> library list sensitive.
> My current logic is to call a program with the data needed for the data queue
> and test if the processing job for the environment is active.
> I do this using the List Active Jobs API and if the job is not active, I submit
> it.
>
> My question is what is the best way to call this program from the trigger to
> ensure that I will always get the current version?
>
> Thanks,,
>
> Jeff Young
> Sr. Programmer Analyst
>
>
>
>
>
>
> ________________________________
> From: "Morgan, Paul" <Paul.Morgan@xxxxxxxxxxx>
> To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
> Sent: Fri, June 17, 2011 11:49:05 AM
> Subject: RE: Trigger Processing Question
>
> Jeff,
>
> Why must the trigger program check if the processing program is active?  That
> shouldn't be done in the process that fires the trigger.  Do that with some sort
>
> of scheduled job to occasionally check if the process monitoring the data queue
> is active.
>
> Why must the trigger determine if the data queue exists?  I'd just have the
> trigger program push an entry into the data queue.  Monitor or trap that push
> into the data queue for an error. If you trap a 'data queue doesn't exist' error
>
> then do something about it.
>
> Paul Morgan
>
> Principal Programmer Analyst
> IT Supply Chain/Replenishment
>
>
> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx]
> On Behalf Of Jeff Young
> Sent: Friday, June 17, 2011 11:34 AM
> To: Midrange Systems Technical Discussion
> Subject: Re: Trigger Processing Question
>
> Hi Paul,
> That is basicaly what I am doing, but I need to determine if the data queue
> exists and if the processing program is active.
> I have a program that will do that, but what is the best way for the trigger to
> call it so that if needed I can make adjustments to it without having to
> worry about what version the trigger is actually calling.
>
> Thanks,
>
> Jeff Young
> Sr. Programmer Analyst
>
>
>
>
>
>
> ________________________________
> From: "Morgan, Paul" <Paul.Morgan@xxxxxxxxxxx>
> To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
> Sent: Fri, June 17, 2011 10:43:08 AM
> Subject: RE: Trigger Processing Question
>
> Jeff,
>
> Fire off an entry into a data queue from the trigger program.  Have another
> process already running which is monitoring the queue and processes the entry to
>
>
> call the other program to do some other processing.  It's possible for you to
> shut down the process and restart it to make changes to the other program.  As
> long as the data queue is available the trigger program can continue to fire
> entries into the queue.
>
> I wouldn't do any checking for a data queue or process in the trigger program.
> Neither would I submit a job or call the program from the trigger program.  You
> want to reduce as much as possible any possibility of an error or delay with the
>
>
> trigger program.
>
> If you want to make changes to the trigger program you should use the Trigger
> Mediator pattern.
>
> Paul Morgan
>
> Principal Programmer Analyst
> IT Supply Chain/Replenishment
>
>
> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx]
> On Behalf Of Jeff Young
> Sent: Friday, June 17, 2011 10:27 AM
> To: midrange-l@xxxxxxxxxxxx
> Subject: Trigger Processing Question
>
> V6R1
> I have a trigger program that is going to be called thousands of times during
> the day.
> This program will test some fields in the old and new record and then fire off a
>
>
>
> program to do some other processing if they are changed.
> At this time this is the only trigger being used, so the Trigger Mediator
> program is overkill.
> I want to be able to make changes to the program doing the proessing if needed.
> I will initialy call a program to test if  a data queue exits and if the
> processing job is already active and waiting for a message.
> If not, the program will create the data queue and then submit the processing.
>
> What is the best method to call this program?
>  Dynamic call from the Trigger?
> Submit job to batch ?
> Some other method?
>
> All suggestions will be appreciated.
>
> Thanks,
>
> Jeff Young
> Sr. Programmer Analyst
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