On grace full shutdown of deployment listener it doesn't process the queued jobs

When listener is shutdown gracefully then it doesn't complete the processing of queued jobs by this there will be loss of message.

Steps to reproduce.

Step 1: Send a deployment request.
Step 2: Wait till the listener picks the request.
Step 3: Shutdown the listener gracefully.(KILL -TERM $PID)

Actual Result :
The grace full shutdown of listener will end up the processing message.

Expected Result :
On grace full shutdown of listener it should process the queued jobs before shutdown.

In listener log it shows

2013-06-26 13:12:00.126 (3) [AdMaxDeploymentsListener Shutdown Thread]: AdmaxDeploymentsListener recieved a shutdown signal