Re: Monitoring IFS directory for file creation -- MIDRANGE-L

Hello John,

- One of the challenges that you are facing is the absence of a journal
event associated with the file being closed. In stead you can use the
QP0LROR (Retrieve object references) to detect when there is no longer being
held a lock against the file.

I wrote an example of such a utility a while ago that can be found here
(ProVIP membership required):
http://www.iseriesnetwork.com/resources/clubtech/index.cfm?fuseaction=ShowNewsletterIssue&ID=19712

Let me know if you have any questions.

Best regards,
Carsten Flensburg

----- Original Message ----- 
From: "JK" <johnking@xxxxxxx>
To: "'Midrange Systems Technical Discussion'" <midrange-l@xxxxxxxxxxxx>
Sent: Friday, January 21, 2005 10:16 PM
Subject: Monitoring IFS directory for file creation


> Hello all,
>
>  We need to automatically execute a job whenever files are created in a
> particular IFS directory. The process needs to work no matter how the
files
> arrive: via FTP, drag-n-drop from Windows Explorer or other processes yet
to
> be invented. I could write a sleeper program to monitor the directory
every
> 'x' minutes, but would rather take advantage of a system function if
> possible.
>
>  This appears to be do-able by journaling the IFS directory. The archives
> are full of examples of doing this for DB2 files, but I want to make sure
> this is viable for IFS directories before committing to management. Or
maybe
> there is a simpler way? Would someone be kind enough to critique this
and/or
> steer me in the right direction? I think I need to:
>
> 1) Create a journal and receiver.
> 2) Associate the IFS directory with that journal.
> 3) Submit a QBATCH job that uses RCVJRNE to watch the journal.
> 4) The QBATCH job wakes when an entry appears in the journal. If it
> determines that a 'file close' action occurred it will submit a job to
> process and remove the IFS file.
> 5) QBATCH program goes back to sleep again.
>
>  I've completed steps 1) and 2) and manually added files to the monitored
> directory. Sure 'nuff, the system creates multitudes of journal entries.
It
> appears the 'CS - IFS object closed' is the one we want to watch.
>
> Questions:
> 1) Is OpsNav the only way to manage IFS journaling? I don't always have a
> fully-loaded PC next to me and a green-screen command would be a nice
> fallback.
> 2) Using drag-n-drop from WinExp creates 50+ journal entries for each file
> created: commitment control, attribute changes, stuff I couldn't care less
> about. That seems wasteful, plus I'm confused about exactly which entry
> indicates that the file is closed and is safe to process. Can someone
> enlighten me?
> 3) Does a program using RCVJRNE behave similarly to 'QRCVDTAQ'? That is,
> does it wait patiently until an entry appears or does it require something
> different?
> 4) What techniques should be used to ensure that the QBATCH program is
> running and how to restart it without re-processing existing entries? A
> utility named 'DspAudLog' by Mr. Oguine published by iSeries in June 2000
> records the last-used journal sequence number in a data area. Is this
still
> the best technique?
> 5) What else have I missed?
>
> Many thanks, JK
>
> -- 
>
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