OSB: Proxy to proxy publish async

Question

Hi
PS_1 publishes data to PS_2 (PS_2 wsdl has no outbound so it is asynch)
I googled and I found following at http://victor-jan.blogspot.in/2012/06/osb-publish-routing-and-service-callout.html:
Publish: Used for Request only scenarios where you don't expect a response back. The nature of Publish action (sync or async) will depend upon the target service you are invoking.
Invoking an external service through a business service, then Publish action with Quality of Service(QoS) as "Best Effort" (default) will work like fire and forget and thread won't get blocked (async call).
Invoking a local proxy service (proxy with transport protocol as "local") from another proxy using publish action then it would be a blocking call (synchronus call) and thread will get blocked untill the processing of local proxy finishes.
The same information on multiple threads on forum.
I changed proxy service PS_2 protocol to http and tested by publishing from PS_1.
Then Created a business service over PS_2 and published from PS_1 to BS_2.
All in vain. So is it that Proxy service to Proxy service Publish is IMPOSSIBLE in OSB?
Can anyone confirm?
Thanks and Regards
Swapnil Kharwadkar

Answer 1

Swapnil,
Publish call will be blocking if QoS is set as Exactly-Once.
If QoS is Best-Effort and target endpoint is a one-way proxy service then it is a blocking call (source proxy waits for target proxy message flow completion) and if QoS is Best-Effort and target endpoint is a request-response proxy service then control returns back to source proxy as soon as Request pipeline of target proxy message flow completes.
Regards,
Anuj