An Enhanced Service Oriented architecture for building Web-based applications

Service Oriented Architectures have recently emerged as a promising approach to develop Web-Based service provision environments. These architectures are characterized by federating services into a single, dynamic distributed system which is capable of spontaneously discovering and configuring itself upon service connections and disconnections. This work proposes a new architectural model, namely PRINCEPS, of Service Oriented Architecture particularly suited for implementing Web-service applications. In particular, two are the main contributions: Service Discovery protocol and Service Delivery Infrastructure. PRINCEPS implements a novel Service Discovery protocol which is able to assemble service according client’s requirements in terms of desired quality attributes. Such a protocol is XML-based, implemented using Jini middleware, and it is able to discover services at run-time. PRINCEPS is also able to provide a Delivery infrastructure, which is based on the HTTP protocol, implementing extended client-server models. PRINCEPS can be used as a Web Service Architecture, being interoperable with the standard web service technologies carried out by the World Wide Web Consortium (W3C). A complete example, which demonstrates benefits in adopting PRINCEPS architecture, is also provided. keywords: Service Oriented Architectures, Web Services, Service Discovery, Service Delivery, Jini