Destination Sorting Key - not sorting under load

Question

I have configured a Destination Sorting Key on one of my JMS Queue and it is sorting based on JMSPriority set in the JMS Message Header. The sorting works fine when I test it with a few messages. I am firing messages with priority 9 and 4. When I run a load test with 50-60 messages(both 9&4) , I can see that sorting is happening but its not effective. I still get lower priority messages before the higher priority messages when I read the queue.
What i understand is that messages will be pushed as FIFO only but the Destination Sorting Key makes sure it changes the order of the messages in the queue itself before I read the messages.
Is it possible to sort the messages effectively in the Queue?
Regards,
Vinay Krishnan

Answer 1

I need more info in order to even attempt to answer the question.
Checking for kinds I started using a hashmapYep... That's how I'd do it... build a histogram = new Map<Card.Face,Integer>(); and check it for a pair, two pair, three of kind, flush, four of kind, and whatever else.... remembering the best hand at each stage.
I presume you're asking about this "weird" statement.
Sort the histogram by the count backwards (high values first).
Q: Is there a class that supports key value pairs and is sortable?
A: http://java.sun.com/javase/6/docs/api/java/util/SortedMap.html
.... and dude you need to learn how to google. That was the first hit for "java sorted map".
One hint: Build your HashMap, then get a SortedMap when you're ready to query it in-order... I guess you'll want a "reverse-frequency-table"... i.e. from frequency to value.
Otherwise, I suppose I could create another object that contains two ArrayLists, one for keys and one for values, which I keep in sync, but that seems ugly.Yep parallel arrays (or ArrayLists) are uglier than [Amanda Vanstones|http://www.theage.com.au/ffximage/2005/08/02/amanda_vanstone_wideweb__430x276.jpg] ugly sister. Having said that they're not too totally horrible once they're "hidden" behind a facade.
Cheers. Keith.
Edited by: corlettk on 21/06/2009 23:49 ~~ I didn't see your second post before I posted this... Treat as a confirmation of what you discovered indepenantly... and I'd be interested to see your finished project. Cheers. Keith.