Yes, if you want to check a file being written to by the process while the
process is running, then you could use a <process-action> to do this. Note
that if the process is running a remote machine, then the files the
process is writing to won't reside on the STAX service machine so you
couldn't simply so this via a <script> element. But you could use a
<process> element (within the <process-action> element ) to run command
"tail -f FILE | grep XXXX" on the remote process machine. You could do
this in a loop where you can also use a <stafcmd> element to submit a
PROCESS QUERY HANDLE STAXProcessHandle reqeust at the end of the loop and
if it returns RC 48 (does not exist), then you know that the process is no
longer running and you exit the loop so that the <process-action> task
completes.
When a block is terminated and the block contains one or more <process>
elements, STAX submits a PROCESS STOP request to stop a process. See the
STAF User's Guide for more information on the PROCESS service's STOP
request. Note that it will try to stop the process using the default stop
method for the process. STAF provides several different stop methods for
processes that are documented in the STAF User's Guide at
http://staf.sourceforge.net/current/STAFUG.htm#HDRPSSTOP and vary
depending on if the operating system the process is running on is Unix or
Windows. You can override the stop method for STAX to use by specifying
the <stopusing> sub-element for a process.
stopusing - allows you to specify the method by which this process will be
STOPed, if not overridden on the STOP command. The value is evaluated via
Python to a string. This element is optional.
If the process cannot be stopped via the default stop method (or by the
stop method specified if overridden via the <stopusing> sub-element) then
the process continues running, but STAX views the <process> element as
complete and STAX will continue processing the next element.
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
Strösser, Bodo <bodo.stroes...@ts.fujitsu.com>
07/08/2009 11:18 AM
To
Sharon Lucas/Austin/i...@ibmus
cc
"'staf-users@lists.sourceforge.net'" <staf-users@lists.sourceforge.net>
Subject
RE: [staf-users] How to stop "process-action"
The process itself writes one or more files. I would like to filter the
files
for relevant messages and print them to STAXMon. So I think about
some lines of Jython that work similar to "tail -f FILE | grep XXXX" and
use Jython 'print' to bring the output to STAXMon. Does it make
sense to do it in <process-action>?
You said:
If a block is terminated and the block contains one or more <process>
elements, then STAX will attempt to stop the process(es) before
terminating the block (but if a process cannot be terminated, it
terminates the block anyway).
I tried some small scenarios. There, when a process catched the
termination signal (e.g. SIGINT), STAX waited for the process'
postprocessing and termination. Did I miss something?
What is the criteria for STAX to suppose that the process cannot be
terminated? Does STAX continue processing behind the block while
the process still is running?
Bodo
From: Sharon Lucas [mailto:luc...@us.ibm.com]
Sent: Wednesday, July 08, 2009 5:58 PM
To: Strösser, Bodo
Cc: 'staf-users@lists.sourceforge.net'
Subject: Re: [staf-users] How to stop "process-action"
What is it you want to do within a <process-action> element? If you told
me that I think I could answer your questions better.
The reason you'd want to use the <process-action> element is if you wanted
to interact with the process while it is running. To do that you can use
the STAXProcessHandle variable to obtain the process' handle (if the
process was not started using the 'shell' mode). Note that the STAX
User's Guide contains an example of how to use the <process-action> to
send a message via the QUEUE service to the process (just an example of
one thing you can do to interact with a process via a <process-action>).
Note that if you simply want to know when a process completes, you'll know
this after the <process> element completes and you don't need a
<process-action> element.
If a block is terminated and the block contains one or more <process>
elements, then STAX will attempt to stop the process(es) before
terminating the block (but if a process cannot be terminated, it
terminates the block anyway).
I think if you simply try using the <process-action> element, you'll
better understand how it works (if you really have a need to use it).
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
Strösser, Bodo <bodo.stroes...@ts.fujitsu.com>
07/08/2009 09:58 AM
To
"'staf-users@lists.sourceforge.net'" <staf-users@lists.sourceforge.net>
cc
Subject
[staf-users] How to stop "process-action"
Hi,
I would like to have a Jython-<script> running in parallel to a process
using <process-action>.
STAX User Guide tells me 'If the process completes before the task
completes, the process
will remain in a non-complete state until the task completes.'
So, how can the script observe the process to make sure that it exits
after the process has
exited?
And what will happen if the process is killed by a block termination from
STAXMon? AFAICS,
STAX waits for the process to exit after sending the signal. Does it also
wait for termination
of <process-action>?
Best regards
Bodo
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