small applications to retrieve/resend all messages

[Andreas Calvo]

Hi,
I want to create a small application that listens in a specific topic 
and react if some consumer request either a missing message or all 
transmitted messages.
This comes because using ActiveMQ along with retroactive consumer is 
limited to the subscription recovery policy, which cannot be unlimited.

I've some questions:
- using KahaDB, is possible to load a received message? or can ActiveMQ 
query for that directly?
- as per description above, time is critical along with unique 
identifiers, anyone has used something like that before?
- and, most important, is feasible? is there any other way to request 
for missing packages?

Thanks!