Open Framework for Web Service Selection Using Multimodal and Configurable Techniques

 

Oscar Cabrera¹, Marc Oriol¹, Xavier Franch¹, Jordi Marco¹, Lidia López¹, Olivia Graciela Fragoso Díaz², and René Santaolaya²

 

¹ Universitat Politècnica de Catalunya (UPC), Barcelona, Spain. ocabrera@essi.upc.edu, moriol@essi.upc.edu, franch@essi.upc.edu, jmarco@lsi.upc.edu, llopez@essi.upc.edu

² Centro Nacional de Investigación y Desarrollo Tecnológico (CENIDET), Morelos, Mexico. ofragoso@cenidet.edu.mx, rene@cenidet.edu.mx

 

Article received on 10/08/2014.
Accepted on 01/11/2014.

 

Abstract

Services as part of our daily life represent an important means to deliver value to their consumers and have a great economic impact for organizations. The service consumption and their exponential proliferation show the importance and acceptance by their customers. In this sense, it is possible to predict that the infrastructure of future cities will be supported by different kind of services, such as smart city services, open data services, as well as common services (e.g., e-mail services), etc. Nowadays a large percentage of services are provided on the web and are commonly called web services (WSs). This kind of services has become one of the most used technologies in software systems. Among the challenges when integrating web services in a given system, requirements-driven selection occupies a prominent place. A comprehensive selection process needs to check compliance of Non-Functional Requirements (NFRs) which can be assessed by analyzing the Quality of Service (QoS). In this paper, we describe a framework called WeSSQoS that aims at ranking available WSs based on the comparison of their QoS and the stated NFRs. The framework is designed as an open Service Oriented Architecture (SOA) that hosts a configurable portfolio of normalization procedures and ranking algorithms which can be selected by users when starting a selection process. The QoS data from WSs can be obtained either from a static, WSDL-like description or dynamically through monitoring techniques. WeSSQoS is designed to work over multiple WS repositories and QoS sources. The impact of having a portfolio of different normalization and ranking algorithms is illustrated with an example.

Keywords: Web service (WS), web service selection, service oriented architecture (SOA), quality of service (QoS), non-functional requirement (NFR), service level agreement (SLA), ranking services.

 

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