WSDarwin: Studying the Evolution of Web Service Systems

The service-oriented architecture paradigm prescribes the development of systems through the composition of services, i.e., network-accessible components, specified by (and invoked through) their interface descriptions. Systems thus developed need to be aware of changes in, and evolve with, their constituent services. Therefore, the accurate recognition of changes in the specification of a service is an essential functionality in supporting the software lifecycle of service-oriented systems. In this chapter, we extend our previous empirical study on the evolution of web-service interfaces and we classify the identified changes according to their impact on client applications. To better understand the evolution of web services, and, more importantly, to facilitate the systematic and automatic maintenance of web-service systems, we introduce WSDarwin, a specialized differencing method for web services. Finally, we discuss the application of such a comparison method on operation- (WSDL) and resource-centric (REST) web services.

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