Blocking consumer and transaction

[Simone Maletta]

Hi guys,
    I've got a question: I'm using JMS transport to develope my work and I need 
that only an instance of my process will be on listining on the queue and that 
the queue  as lenght one.
May I obtain this using servicemix-jms settings deploying with the wsdl?
May I also define a container-transaction with servicemix-jsr181 component?
And if this is possible, how I may do this?
Thank you for your time, regards
Simone