Service-Correlation Aware Service Selection for Composite Service Based on the Improved Dijkstra Algorithm

Web Services, as a way to implements SOA, are equipped with the characteristic of loose coupling. In service oriented application, more and more projects not only need to invoke a certain Web Service, but the composite application of Web Services which is selected from different physical locations. A combination of multiple-Web Services can be implemented by BPEL or the implementations of Web Services procedures can fit the Web Services together from different locations. However, as so far, it´s very difficult to assemble Web Services effectively and the QoS of different combinations are various. Further more, current service selection approaches often consider that a service is independent from other services and fail to establish the Service correlations. This paper proposes a dynamic weighted model of service-correlation aware with improved Dijkstra algorithm and self-adaptive algorithm to carry out a better combination of the candidate web services. A case study is conducted to demonstrate the advantage of the proposed approach in obtaining a better QoS.