Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solutions (Addison-Wesley Signature Series (Fowler))

by Hohpe Gregor

There are six parts to Correlation Identifier. 1. Requestor—An application that performs a business task by sending a request and waiting for a reply. 2. Replier—Another application that receives the request, fulfills it, and then sends the reply. It gets the request ID from the request and stores it as the correlation ID in the reply. 3. Request—A Message (66) sent from the requestor to the replier, containing a request ID. 4. Reply—A Message (66) sent from the replier to the requestor, containing a correlation ID. 5. Request ID—A token in the request that uniquely identifies the request. 6. Correlation ID—A token in the reply that has the same value as the request ID in the request.