Sure. Look at
On 8/8/06, sparky2708 <[EMAIL PROTECTED]> wrote:
yes, calculation is very cheap. Just a sum.
What you describe is exactly what I would like to do (in an ideal case).
We were thinking of creating a module that would attach to an ActiveMQ
broker so a crashed or recently started client would ask the module for the
sum and then start receiving messages from the JMS.
Although I think ultimately the above is doable but before we take the
hard road it would be interested to know how to track the sum at the broker?
In activemq you add your own custom broker type interceptors. Here's
an example one:
http://svn.apache.org/viewvc/incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/advisory/AdvisoryBroker.java?revision=426366&view=markup
That example creates 'advisory' messages that get sent to a topic when
connections/producers/consumers are created/destroyed. The one bit
that is similar to your case is that when a consumer for that advisory
topic comes on, it sends that consumer all the events that it had
missed so that it know about all the connected
connection/consumers/producers.
In your case I think you would just need to override the
"send(ConnectionContext context, Message messageSend)" call to keep
your counters. Also override the " addConsumer(ConnectionContext
context, ConsumerInfo info)" So that you can send a message to the
consumer with the sum when he gets created.
I guess what I am trying to find out is where on the broker do you keep it
(that would be the ideal solution). Can you give me some examples or point
me to some documentation where I can read about this functionality?
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Regards,
Hiram
Blog: http://hiramchirino.com
