Queue Mechanism in OBPM 10GR3

Question

Hi all,
We want to develop a queue mechanism in BPM. We want only 5 out of a total of 10 instances to enter a sub-process at a time. Only when the count is less than < 5, would the next instance enter the sub-process.
But we are finding it difficult to implement this using BPM and db.
Whenever an instance enters the sub-process we increment the count in an external db and whenever an instance leaves the sub-process we decrement the count in the external db.
And before this step, we check for the counter from the db by matching it with a Max. Counter.
But the problem with this is that, when the counter is less than the < Max. Counter, if 3 instances are waiting in the queue, all three are released instead of one. This is because it takes time to increment the db and there is no locking mechanism in place to make sure that the db is locked while incrementing the counter and therefore the queue does not really work.
Does anybody has any suggestions?

Answer 1

Hi VR,
please have a look at this two links:
XI Asynchronous Message Processing: Understanding XI Queues
XI Asynchronous Message Processing: Understanding XI Queues -Part I
Registering queques
http://help.sap.com/saphelp_nw04/helpdata/en/7b/94553b4d53273de10000000a114084/frameset.htm
Queque assignment
Performance Tuning Checks in SAP Exchange Infrastructure(XI): Part-III
Complete reference for IDOC queuing and monitoring
Setting up inbound qRFC queues for serializing IDocs using the IDoc Adapter
Regards
srinivas