How can i make an MDB to choose from a list of Queues

Question

In my application i am having 40 Queues in all, now my present MDB is configured to read messages from only one Queue and act upon it. Now in order to handle messages from 20 different Queues, do i need to deploy 20 MDBs , one for each Queue. Ot is it possible to program a single MDB in such a way so that it can act on 20 or more queues, taking one Q at a time.
rc...

Answer 1

hi jm4rc,
until the ejb 2.1 specifications, it does not specify that you can or cannot define more
than one destination per consumer or MDB. however, the specification is consistent
about mentioning a destination per MDB which uses Queues as end pont, hence is
called PTPP (point-to-point protocol), e.g, from "one" end to "another".
if you do define in your descriptor file that your MDB (consumer) should listen to more
than one destination, the behavior is not specified nor defined at how the container
will handle a scenario, i.e., it can behave properly or troublesome.
if your intention is to allow your MDB to listen to multiple destination, you might want
to configure your MDBs to become "subscriber", rather than "consumer" so that it
may be able to listen to more than one end-point and you could also configure it to
publish message to more than one end-point as well.
in the end, you may have to define only a single MDB to process messages that will
arrive at many end-points. after all, container can instantiate multiple instances of
one MDB type, maintain them in the pool, activate them to process several requests
simultaneously.
regards,