How to poll a PL/SQL procedure in BPEL?

Hi,
Normally in BPEL your start your process flows by receiving an event. You can only create a BPEL instance via a Receive or Pick activity. I have a couple of integrations where I have to continually call a PL/SQL procedure and then call another PL/SQL procedure with the output from the first procedure. This is done by invoking 2 partner links and a While activity. I got this working fine. The problem is how to create the instance. At the moment I start the flow by reading in a dummy file with a Receive event. This works for now but if the process has to be restarted it will not work since BPEL know that it has already read the file.
I have tried to start the flow with a receive activity that calls a PL/SQL procedure but I get the error “Operation is not specified” (http://theheat.dk/bpelDb1.jpg). Normally you would use a Invoke activity when calling a PL/SQL procedure, but when I try that I get an error because I don’t have a receive activity first (http://theheat.dk/bpelDb2.jpg)
So basically I need a way to have a receive activity call a PL/SQL procedure.
I have the exact same problem when I need to continually call a Web Service and send the output to a PL/SQL procedure. Here I need an Invoke activity that calls the Web Service and an Invoke that calls the PL/SQL procedure but to get the flow initiated BPEL wants a receive activity.
Regards Pete

I found a simple solution that works but I would like to hear if anybody can see any problems with this approach:
I create a dummy table with one row. I create a partner link that polls the dummy table every 5 minutes. The operation on the table is an update, but the Read value and Unread value are the same!
Every 5 minutes BPEL kicks of a process that calls a PL/SQL procedure etc. There will always be a row in the dummy table and as long as my polling interval is longer than the processing time of the flow I will never have more than one process in-flight at a time. This should ensure that the solution is robust.
Regards Pete
Message was edited by:
Peter Lorenzen
Message was edited by:
Peter Lorenzen

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