Sync-Async Gotchaa

Question

Hi Friends,<br>
I am in a problem, I have one jpd published as a webservice to a poral [synchronous] client. This jpd is asynchronous,meaning it have separate client request and client response node, but the same jpd is calling one more process control[async again] to do the dirty work of tranforming incoming request and then sending to legacy system using JMS control[async activity]. The question is, can we call the outer jpd [that is published as a web-service] synchronously from a portal page. I seen the weblogic docs they say to make sync-async wsdl file and define client callback method,I tried it but it doesn't work.<br>I think my design fall in some limitation that the doc is talking about as in between pair of client request and client response node I have another client request to the process control [for transforming and sendng receiving message].<br>
     <b>Is there anyother way to make it work?<br>
     Did anyone got the same problem before?<br>
     Guys, you need to help me in this pls<br>I already tried lots of permutation and combination to arrive at this design so pls don't ask me to change this now. :(<br>
Cheers,<br>
Shailesh

Answer 1

Hi Rohini,
Sync/async communication enables a synchronous sender system to communicate with a receiver system that cannot process synchronous messages.
The central component of sync/async communication is the sync/async bridge, which enables the Integration Server to receive synchronous messages from a sender and send them to a receiver as asynchronous messages. Conversely, it can send the asynchronous response from the receiver back to the sender as a synchronous response.
To do this, you define an integration process, which is started as soon as a synchronous message is received from the sender system. The process uses a special receive step to open the sync/async bridge, sends the received message to the receiver system asynchronously, and waits for the asynchronous response to arrive from the receiver.
The Business Process Engine receives the asynchronous response from the receiver, correlates it with the corresponding query, and activates the waiting process, which then sends the response back to the sender synchronously.
There is an example of the Sync/Async Bridge in th SWCV: SAP BASIS.
Namespace: http://sap.com/xi/XI/System/Patterns
Go through this link to get a good idea as to how to <a href="http://help.sap.com/saphelp_nw04/helpdata/en/43/65d4dab39b0398e10000000a1553f6/frameset.htm">Define Sync/Async Communication</a>
This blog also should give you some idea...
https://www.sdn.sap.com/sdn/weblogs.sdn?blog=/pub/wlg/1403 [original link is broken]
Also go through these links:
http://help.sap.com/saphelp_nw04/helpdata/en/83/d2a84028c9e469e10000000a1550b0/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/c4/dc06418752ef6fe10000000a1550b0/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/f9/66bf40ad090366e10000000a1550b0/RN_XI_DE_neu.pdf
I hope it helps.
Regards,
Abhy
Message was edited by: Abhy Thomas