asynchronous urlexternal task design pattern

catorarn

I am using 731.

i have this use case:
a workflow has a java (URL) external task which calls a service asynchronously. The service follows a JMS pattern and publishes status. We need to get a callback to the URL external task in case the job on the service fails or ends. we do not want polling.

Does anyone have experience to share on this? How would the external task be best designed