Sync/Async Bridge Using Only One (1) ICO

Introduction:

Most of the sync/async implementations using the adapter modules that you can find are using two ICOs. One ICO will send request to the intended receiver system and at the same time writes a file with the message id as the filename to be used for correlation. Another ICO will pick up the file and use the filename as correlation id to match the response to the request message and send the response back to the sender system. The response time will depend on the polling interval value that you use in the file sender adapter of the second ICO. It would be helpful for you to read some examples below:

https://blogs.sap.com/2007/08/02/syncasync-scenarios-without-bpm/

https://blogs.sap.com/2014/04/14/bridges-construction-site-23-synchronous-asynchronous-bridge/

In this blog you will learn to use just one ICO and that the response message will instantly go back to the sender system using only standard adapter modules.

How it works?

• The scenario will use three (3) adapters
  • Sender SOAP adapter – will send the request message
  • Receiver IDoc adapter – will send the idoc to ECC
  • Receiver file adapter – will notify the sender and return the response message
• Two mappings will be used
  • Transform request to idoc format
  • Transform request to response
• SOAP adapter will send the request to two receivers
  • The first receiver will use a mapping to transform the request message to idoc format and then the idoc receiver adapter will send it to ECC.
  • The second receiver will use a mapping to transform the request to a response message and will use the file receiver adapter to notify the sender and will also send the response back to the sender

Steps:

Create Data Types and import the IDoc:

• DT_Request
• 
• DT Response – similar to request but it has an extra Message segment
• 
• WMTOCO.WMTCID01 – standard Transfer Order confirmation idoc
• 
• Create message types and service interfaces for the request and response types

Create Message and Operation mappings

• Message mapping – request to idoc
• 
• Message mapping – request to response mapping is basically one-to-one and below table define the mappings for fields under Message segment
• 
• 
• Create operation mapping for each message mappings.

Create the three (3) adapters

• SOAP Sender
• 
• Important information about the module configuration of AF_Modules/DynamicConfigurationBean
• 
• File Receiver
• 
• IDoc Receiver – usual idoc receiver

Create the ICO

Testing

• We will only use SOAP UI to test it
• 
• 
• Dynamic Configuration – the read operation retrieve the message from the header and write it in the dynamic configuration
• 
• PI message header – the write operation retrieve the message id from the dynamic configuration and write it in the header as conversation id (correlation id)
• 
• Verify the IDoc in ECC
• 

It is plain and simple but it would really help to improve performance as it send the response back without the need for second ICO and the response time is instant. Give it a try!