Q-DWSO: hybrid approach for QoS-aware dynamic web services orchestration Online publication date: Sun, 17-Jun-2018
by Reena Gupta; Raj Kamal; Ugrasen Suman
International Journal of Web Engineering and Technology (IJWET), Vol. 13, No. 1, 2018
Abstract: Many complex business-applications require the composition of tasks invoking multiple web services. The complexity of a composition process increases when a composition needs dynamic functionalities. Web services (WSs) of different service providers can be functionally identical, but have varying Quality of Service (QoS) attributes. A QoS optimisation is thus required at every stage in a composite web service (CWS). Maximising the overall utility functions are the need at both, component and composition levels. Local (task level) or global (composition using tasks in CWS) optimisation is currently used approach during the composition from the tasks. The present paper proposes a hybrid approach using the local as well as global optimisations. While local optimisation ensures the composition from the WSs in the trustworthy environment, the global optimisation satisfies the QoS constraints at the global level. The approach uses a hybrid orchestration structure. It maximises overall utility functions and reduces computational time related complexity.
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