Migrating from legacy to SoA (Invited Talk)

This presentation discusses a strategy for migrating to a service-oriented architecture. The starting point is legacy code in a procedural or object-oriented language. The result is a set of web services that can be accessed in a private or public cloud. The technique used is to cut out selected portions of code and to wrap them behind a service interface. The code itself can be left in the original language. The service interface is in WSDL. The speaker describes how to go about selecting code for reuse and how to extract that code from its current environment. Case studies are given for the languages COBOL and Java. The presentation then goes on to describe how to test the services using a web service testing tool which generates artificial requests from the service interface definition and validates the responses against the assertions provided by the tester.