QoS4WSC: A Framework for Web Services Composition based on QoS constraints
Bassirou Gueye, Ibrahima Niang, Bamba Gueye, Mohamed M. Ould Deye · 2013
Web Services Composition (WSC) is a paradigm for enabling application integration within and across organi- zational boundaries. Nowadays, the main challenges of WSC in environment like Internet are to ensure high quality execution. Former works on service composition have enabled the elabora- tion of the BPEL4WS standard. Nevertheless, the management of the Quality of Service (QoS) of service composition, generally defined in Service Level Agreement (SLA), was not taken into account. Therefore, it is mandatory to built flexible solutions, reusable, and offering a suitable level of abstraction. We propose a new framework, called QoS4WSC, that evaluates constraints-based response time in WSC. In order to provide a model which can estimate the effective response time of a service composition, we use a parsing file composition technique. Since elementary web services are based on a best effort approach, we propose an architecture which takes into account the response time of a each given service. Our architecture is composed by two components. The first one pre-determines the response time of elementary web services and the second one verifies the QoS constraints related to the WSC.