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Thread Pooling

 
James Shailes
Greenhorn
Posts: 3
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I'm trying to set up thread pooling so that I can have many threads consuming and processing messages from a JMS queue. I thought I had found the solution upon reading about ThreadPoolTaskExecutor however I can't seem to find a way of prioritising thread execution. If I can briefly explain an abstraction of what I'm trying to do:

1. The jms queue is being populated from an external source with messages of the format {customerId, foodId}, for example customer 1 has bought an apple. Customer 1 may also have bought a pear but this would be a separate message.

2. Only one thread in the pool can be processing the same customerId at any one time.

It is step 2 that I'm really struggling with as I can't see a way for a ThreadPoolTaskExecutor to prevent execution of a message {customer1, pear} until {customer1, apple} has finished executing.

Can anyone point me in the right direction?

Cheers,

James
 
Edward Harned
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Posts: 291
Java
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What's wrong with the answers you got on the Sun Concurrency Forum?
http://forums.sun.com/thread.jspa?threadID=5414946&tstart=0

Others here may not know about the other answers and waste their time. This is the reason for not posting the same question to multiple Forums.
 
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