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From spamtrap <>
Subject Re: Allowing another consumer to have a message (ActiveMQ-CPP)
Date Tue, 09 Jun 2015 13:09:36 GMT
On Tue, 9 Jun 2015 06:43:45 -0600, Tim Bain
<> wrote:

The situation is that the consumer gets a message from a queue and
then converts into into a different format and sends it to an
application server, which should respond with an acknowledgement
message.  If the application server does not respond to a particular
message then we want to be able to allow another ActiveMQ consumer to
pick up the message and send it elsewhere.  Any consumer should be
able to process the message so we don't want to use selectors.

>In this scenario, do you want to consume it twice, or do you really want to
>consume it once but you're picking which consumer gets it?  If the latter,
>can you use selectors to make sure the right consumer gets the right
>messages?  Or maybe an embedded Camel route to send those messages to a
>queue that's specific to the consumer that should get them?
>On Jun 9, 2015 6:00 AM, "spamtrap" <>
>> On Tue, 9 Jun 2015 07:24:24 -0400, Christopher Shannon
>> <> wrote:
>> >The use case you are trying to achieve is probably best done by using a
>> >transaction instead of individual acknowledgements.  If you call rollback
>> >on the session then the message would be available to be redelivered to
>> >another consumer.
>> I don't think I can use a transaction because all messages are
>> committed at once.  We need to be able to select which messages may be
>> redelivered and which not, hence the individual acknowledge mode is
>> used.
>> Will the rollback work with individual acknowledgements?
>> >
>> >On Tue, Jun 9, 2015 at 3:50 AM, spamtrap <
>> >> wrote:
>> >
>> >> Hi,
>> >>
>> >> In some cases we want to allow another consumer to consumer a message
>> >> that has already been consumed.   The session is opened using
>> >> INDIVIDUAL_ACKNOWLEDGE and the message has not been acknowledged.  I
>> >> have tried closing the session where the message has been consumed but
>> >> the message is not available to the other consumer.  How can I achieve
>> >> what I need?
>> >>
>> >> TIA.
>> >>
>> >>
>> >>

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