Business service events

Hi,

I was wondering if there is any information about the events I can use when using a business service. I am using "OnProcessInput" event to define the logic of my script but I would need to run a different script when finished. I guess it would be easier to understand if I provide more information. My business service just calls a store procedure to receive messages from a database. Once there are no messages received I need to run a different query but I cannot find any option to determine when the last message has been received.

I found OnClose and OnTearDown events...but those are more production related and not working as onteardown is called before onprocessinput.

Thanks