This is the information flow between SDC and SO. I am going to use the same approach to achieve communication between SDC and CDS listener.

Ref:

https://wiki.onap.org/display/DW/ARCHCOM%3A+InfoFlow+-+SDC+Service+Distribution

https://wiki.onap.org/display/DW/SDC+Distribution+client+AID

These are the steps to be followed -

Register for Distribution (Instantiate and register SDC client)

Get Distribution Notification (Get the notification result from SDC)

Send Distribution Status  (From the listener component to SDC) 

Get (download) Deployment Artifact (In this case it would be CSAR package)

Unregister from Distribution (Listener need to unregister after completion)