Browsing by Author "Vairetti, Carla"

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    A SEMANTIC APPROACH FOR DYNAMICALLY DETERMINING COMPLEX COMPOSED SERVICE BEHAVIOUR
    (2016) Vairetti, Carla; Alarcon, Rosa; Bellido, Jesus
    Dynamic Web services composition aims to generate a composition plan at run-time. Semantic-based techniques rely on annotating services to facilitate the discovery of the service components that satisfy a user need (matchmaking). The matchmaking process places most attention on service selection rather than on the behaviour of the composed service, and the service components are arranged considering simple control-flow patterns (mainly sequence). In real life scenarios, however, composed service behaviour follows complex control-flow patterns that satisfy the needs of business processes, which are generally defined through manual service composition. In this paper we present a technique to derive complex composed service behaviour semantics, such semantics make possible to dynamically and automatically discover complex services compositions. We have implemented and tested our technique with a known dataset with better performance when compared to simple service composition strategies.
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    A. SEMANTIC. APPROACH. FOR. DYNAMICALLY. DETERMINING. COMPLEX. COMPOSED. SERVICE. BEHAVIOUR
    (2016) Vairetti, Carla; Alarcón Choque, Rosa Ángela; Bellido Angulo, Jesús Edwin
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    Analysis and improvement of business process models using spreadsheets
    (2016) Saldivar, Jorge; Vairetti, Carla; Rodríguez, Carlos; Daniel, Florian; Casati, Fabio; Alarcón Choque, Rosa Ángela
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    SAW-Q: a dynamic composition approach of REST services based on queue model
    (2019) Bellido, Jesus; Alarcon, Rosa; Pautasso, Cesare; Vairetti, Carla
    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.