A framework for early design and prototyping of service-oriented applications with design patterns

Service-oriented computing is playing an important role in several domains. Today the biggest shift in mainstream design and programming is toward serviceoriented applications. However, the service paradigm raises a bundle of problems that did not exist in traditional component-based development where abstraction, encapsulation, and modularity were the only main concerns. Due to their distributed, dynamic, and heterogeneous nature, service-oriented software applications require us to discover, document, and share new design patterns at the serviceand architecturelevel. Moreover, service-oriented applications are hard to design and validate, and demand for new foundational theories, modeling notations and analysis techniques. In line to such a vision, this article presents a framework, called SCAPatternBox, to design and prototype service-oriented applications with design patterns. The framework relies on the OASIS standard Service Component Architecture (SCA) and on SCA component implementation types, such as SCAJava, for supporting an “implementation-oriented” approach to service-oriented architecture modeling and to the definition and instantiation of design patterns. Moreover, in order to provide formally verified design patterns, SCA-PatternBox allows the formal specification and analysis of the functional behavioral aspects of a design pattern using a formal service specification language called SCAASM (Service Component Architecture Abstract State Machine). As major evaluation of the framework, two case studies and lessons learned are presented. A final comparison of existing design pattern languages is also reported.