JMS Consumption

Question

Hi Guys,
I need to understand how to control the consumption of messeges from JMS Queue.
This is what i tried:
1. I created a Queue names TQ.
2. Then created a BPEL process to enqueue messages in TQ.
3. Created a BPEL process to dequeue messages from TQ
At this time when I checked the TQ in weblogic under Monitoring Tab it was showing "consumer current" = 1
4. I stopped the consumption of the TQ.
5. I loaded 5000 messages in TQ using Enqueue BPEL Process.
6. Now the "Current messages" in Weblogic shows 5000 for TQ
7. After this I enabled the consumption of the TQ.
8. Immediately, I jumped to the em console and checked the "Running Instances" check box for the Dequeue service. it displayed 100 running instances.
9. I no where mentioned the number of instances, all above is without any customisation.
10. I refreshed the console several times, the "Running Instances" count fluctaues between 85 and 110, till the complete load is finished.
Please let me know how can this consumption be controlled and when will the "consumer current" = 1 value changes....?
Regards

Answer 1

Hi Arpit,
There is limited support in restricting the consumption. However, you can slow or accelerate the consumption using the following.
To accelerate consumption:_
By default there is 1 poller thread that dequeues the message from JMS. If you increase that thread count, you can accelerate the consumption. Set the adapter.jms.receive.threads Property for this as explained under.
http://docs.oracle.com/cd/E14571_01/core.1111/e10108/adapters.htm#BABCGCEC
To Slow down consumption:_
Introduce the delay between the message consumption as explained under.
Restrict SOA JMS Adapter dequeue frequency
Try with various combinations and let us know how you get along.
Regards
Neeraj Sehgal