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External Task using Workflow modeler

Badli15

Hi ,

Can anyone help me to create a workflow having External Task to initiate an exe or java class before submitting the files.

Thanks,

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Adam Stoller

Are you planning to pay us to help you do your job? Or do you have a more specific question that is preventing you from doing it yourself?

Badli15

Hi Ghoti,

I thought this as open form , thats why writing my queries.

Anyways I have created the workflow with Exteranal task.

In the workflwo I want to run an exe which will merge some json files. I have used external task for the same.

I havnt used External task before; so just want to know that which query will execute my exe in command-script.

Like for IPL we use:

$IW_HOME/iw-perl/bin/iwperl $IW_HOME/custom/bin/scripts/mergejson.ipl

Thanks again!!!

Adam Stoller

You formulated your query better this time - before you were basically asking for someone to do work for you for free.

Generally - if it's an exe - you should be able to just write the path to the EXE - e.g.: c:/****/yyy/zzz.exe

However, unless you actually wrote the EXE and provided it with the ability to perform callbacks - you don't want to call the EXE directly from the workflow externaltask - instead you want to call a wrapper (perl, batch, whatever) - that calls the EXE and then performs a callback to the workflow to let it know that the task has completed and that it can transition.

The alternative would be to call the EXE directly but have a timeout specification on the task that forces the workflow to transition to the next task automatically after some elapsed time - but that would mean that you are not checking the results / exit code of the EXE and just blindly transitioning as-if it was successful (not a very good practice in most cases)

Badli15

Hi ,

Can you guide me to make the perl batch or any example for help or if I will opt for some elapsed time option how can I apply that ?

Thanks a lot!!!

Adam Stoller

Badli15 wrote:
Hi ,

Can you guide me to make the perl batch or any example for help or if I will opt for some elapsed time option how can I apply that ?

For running batch scripts from the Perl script - I'd play around with it a bit - you might be able to just execute the batch script directly or you might have to run it through cmd -c "...", in both cases via something like qx() or system().

I don't know what you need "elapsed time" for - you can always put a sleep(integer) call into the code if you want it to delay for some reason, but you shouldn't have to do so as near as I can tell from your description thus far, unless startdeploy.bat forks, in which case you could loop through calls to iwodserverstatus (with a sleep(integer) spec in the loop) to wait until there are no running deployments before initiating the script.

Badli15

Hi,

Thanks Ghoti for the guidance. I am able to create an External Task using ipl file and its working fine for me.

But still I am struck with callback issue. Since I havnt done any code for callback thus I can see my task in workflow tab.

My ipl:

#!/vol01/interwoven/TeamSite/iw-perl/bin/iwperl -w
#-----------------------------------------------------------------------------

use strict; # Try to catch errors as early as possible.

eval {
main();
};

#---------------------------------------------------------------------
# main
#       Do whatever processing this program is expected to perform
#       and then activate the task callback.
# ARGUMENTS
#       @args - The program's command-line arguments.
# RETURNS
#       Nothing.
#---------------------------------------------------------------------

sub main
{

   my @args = ("java", "-jar", "/xyz/merge.jar");

   system(@args);

}

When ever I am trying to use use

TeamSite::WFtask;
use TeamSite::WFworkflow;

its showing error :

Can't locate TeamSite/WFtask.pm in @INC (@INC contains: /usr/perl5/5.6.1/lib/sun4-solaris-64int /usr/perl5/5.6.1/lib /usr/perl5/site_perl/5.6.1/sun4-solaris-64int /usr/perl5/site_perl/5.6.1 /usr/perl5/site_perl /usr/perl5/vendor_perl/5.6.1/sun4-solaris-64int /usr/perl5/vendor_perl/5.6.1 /usr/perl5/vendor_perl .) at test.ipl line 7.

Can you please help me out with this.

Thanks a ton for the help

Adam Stoller

You may have specified iwperl in the #! line of the script - but how are you specifying the script in the <command> (wft) or Command: (wfm) property of the workflow?

Based on the error you showed, my guess is that you are prefacing the name of the script with an explicit reference to a different version of Perl on the system (like /usr/bin/perl) - and thus it isn't finding the modules that are on iwperl's built-in @INC path.

Either don't preface the script name that way in the Workflow, or add the explicit paths for the TeamSite perl directories to the @INC path within your script (I prefer the former) - the script itself should be executable, so you should not need to preface it with anything.

Badli15

Thanks for the reply

This is the script I have written in command in WFM and its showing the above mentioned error. Smiley Sad

"$IW_HOME/iw-perl/bin/iwperl $IW_HOME/local/bin/test.ipl"

Thanks!!!!

Adam Stoller

Badli15 wrote:
Thanks for the reply

This is the script I have written in command in WFM and its showing the above mentioned error.

"$IW_HOME/iw-perl/bin/iwperl $IW_HOME/local/bin/test.ipl"

Thanks!!!!

That doesn't make sense unless someone symlink'd $IW_HOME/iw-perl/bin/iwperl to /usr/bin/perl (or some other perl engine) - try getting rid of the $IW_HOME/iw-perl/bin/iwperl, from the command, entirely and see if that makes any difference.

Also verify /bin/ls -l $IW_HOME/iw-perl/bin/iwperl is what it should be.