Title: SAW-Q: a dynamic composition approach of REST services based on queue model

Authors: Jesus Bellido; Rosa Alarcon; Cesare Pautasso; Carla Vairetti

Addresses: Computer Science Department, Universidad de Ingenieria y Tecnologia (UTEC), Lima, Peru ' Computer Science Department, Pontificia Universidad Catolica de Chile, Santiago, Chile ' Faculty of Informatics, University of Lugano, Switzerland ' Facultad de Ingeniería y Ciencias Aplicadas, Universidad de los Andes, Santiago, Chile

Abstract: Service composition is one of the principles of service-oriented architecture; it enables reuse and allows developers to combine existing services in order to create new services that in turn can be part of another composition. Dynamic composition requires that service components are chosen from a set of services with equal or similar functionality at runtime and possibly automatically. The adoption of the REST services in the industry has led to a growing number of services of this type, many with similar functionality. The existing dynamic composition techniques are method-oriented whereas REST is resource-oriented and consider only traditional (WSDL/SOAP) services. We propose SAW-Q, an extension of simple additive weighting (SAW), as a novel dynamic composition technique that follows the principles of the REST style. Additionally, SAW-Q models quality attributes as a function of the actual service demand instead of the traditional constant values. Our model is much more accurate when compared to real implementation, positively improving the quality of dynamic service compositions.

Keywords: REST; quality of service; SOA; dynamic composition; automatic composition; web services.

DOI: 10.1504/IJWGS.2019.10017542

International Journal of Web and Grid Services, 2019 Vol.15 No.1, pp.29 - 58

Received: 27 Apr 2017
Accepted: 29 May 2018

Published online: 15 Nov 2018 *

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