How to process one message at a time on a distributed queue
I have a situation where I need to execute/process a task of a type
asynchronously and this should be done one at a time. To do that I am thinking of setting
up a distributed queue (for load balancing and failover). Now I have
this requirement that only one task should be processed at one time. So
for example if two messages (m1 followed by m2) are sent to distributed
queue and I have the distributed queue which points to two physical
queues on two different instances of weblogic(wl1 and wl2), the
distributed queue will likely send m1 to wl1 and m2 to wl2 (assuming
distributed queue is setup with round robin policy). If m1 has started
executing/processing in my MDB on wl1, I do not want start processing
m2 on wl2 untill m1 has been processed by wl1. Is it possible to do
this on weblogic 8.1 JMS?
If this is not supported I was thinking of implementing a database
based locking framework and each mdb will use that framework to check
if a task of a particular type is being processed before processing a
new task. Also in this case I will need to use max. 1 mdb for each
queue on each weblogic server.
--Navjeet
Hello navjeet,
I don't think there are any parameters that you can set on a distributed queue to ensure messages are handled in the sequential manner you describe so it looks like you will have to implement your own locking mechanism.
In reposponse to your other question you can set the number of MDbeans in the free pool to 1 (or the number of queues you have) in the MDBean deployment descriptor.
see:
http://e-docs.bea.com/wls/docs81/ejb/message_beans.html#1120592
Cheers,
Hoos
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