Re: Compiling Trigger Program

And what happens when you need to change the TTT program? The system has
resolved to it and has the address in memory. If you delete the program,
the next trigger call will crash the program because what it points at is
gone.

If you rename, all the calls will continue to to the old program until you
end any job holding a database lock. In short, it does nothing for you.

That is why you want a trigger mediator. You can rename the implementing
service program and reload and everyone has the new logic. Can't do that
with programs.

Trigger mediators need to have several characteristics.

1. Has standard program that is the trigger program that never changes.
2. Ability to change a trigger control.
3. Trigger logic implemented as service program.
4. Ability to instantly reload.
5. All trigger associations in database tables.


On Tue, Apr 19, 2016 at 12:41 PM, Manuel Chaviano <manny@xxxxxxxxxxxx>
wrote:

We write a simple CL program to act like a wrapper for the trigger
program containing the logic.

Just getting and passing along the required parameters:

0005.00 PGM PARM(&BUFR &BYNARY)
0006.00
0007.00 DCL VAR(&BUFR) TYPE(*CHAR) LEN(1001)
0008.00 DCL VAR(&BYNARY) TYPE(*CHAR) LEN(4)
0009.00
0010.00 CALL PGM(TTT) PARM(&BUFR &BYNARY)
0011.00
0012.00 ENDPGM

TTT is the "real" trigger program that performs the required logic.

El Tue, 12 Apr 2016 14:23:46 -0400
Vinay Gavankar <vinaygav@xxxxxxxxx> escribió:

Thanks. Just confirmed that the programs are locked. Will defer the
recompilation to a time when there is an 'outage' and all the engines are
down.

On Tue, Apr 12, 2016 at 1:19 PM, James H. H. Lampert <
jamesl@xxxxxxxxxxxxxxxxx> wrote:

Vinay Gavankar asked:

Can I recompile a Trigger Program when the Trigger is Enabled and the

file is open?

and Dave Clark replied:

The program object is not locked so it can be

replaced/recreated.

That's not MY experience.

In my experience, trigger programs are ALWAYS locked (multiply locked,

if

the trigger program is shared by many files) by every job that trips

them,

and remain so until the job either ends or closes the triggered

file(s) and

does a RCLRSC.

If you expect to be doing a lot of recompilation of trigger programs,

you

might want to use a trigger-mediator.

--
JHHL

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