[jboss-user] [Messaging, JMS & JBossMQ] - Re: Joining messages (queues)

obfuscator do-not-reply at jboss.com
Sat Feb 3 20:50:27 EST 2007

"Byorn" wrote : How does the MDB know the resouce is ready ???
  | You could use a scheduled task to execute every 5 seconds (n minutes) to check the resource.

I have a fixed number of resources (servers) set up, and put them in a queue. They are available as long as I don't use them... 

Anyway, I'm not going to leave this thread dead, and I came up with a solution... To clear things up, this is what I was trying to acheive:

I had several servers waiting to process compression jobs(compress videos). These were accessible through webservice-interfaces.

Initially, I set up a queue of available webservice endpoints, and had a MDB listening to that queue. When a server became available (MDB.onMessage()), I waited for a compression job (from another queue) to become available (through MessageConsumer.receive()), and then processed that job with the available server.

The problem whas that JBoss disliked this, as I was locking the MDB thread waiting for the next job.

Since I could not come up with a good solution for this scenario, I decided to install a JMS client on each of the compression servers. This allowed me to connect an MDB from each of the servers to the job queue. 

Despite the problem of installing a JMS client on every compression server, this was the only reasonable way I came up with to tackling this usecase. If anyone has any ideas on how to solve this without installing the JMS client on every compression server, I'd be very glad.



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