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From Rob Davies <>
Subject Re: LIFO (not FIFO) queues
Date Thu, 21 Aug 2008 21:34:29 GMT

On 21 Aug 2008, at 13:52, Artur Siekielski wrote:

> Hi.
> Is it possible to change JMS queues semantics to Last In, First Out  
> (ie.
> stack)? Would it be difficult to patch ActiveMQ sources to achieve  
> this?
> Another solution to our problem is using priority queues. But ActiveMQ
> doesn't support priorities. Only Oracle's AQs support this...
> A bigger picture: we are using JMS for grid computations, task have  
> subtasks
> and subtasks have to be computed first. It would be nice to have a  
> general
> solution for this using JMS.
> -- 
> View this message in context:
> Sent from the ActiveMQ - User mailing list archive at

Nice idea! Priorities for messages on Queues are really hard to  
implement - but a potential option would be to have different priority  
Queues - that level of granularity is a lot easier - I'll investigate  

The LIFO  does seem a little wacky  though.



Rob Davies

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