Enhancement of QOS-Aware Web Service Orchestration by Using CF Approach

The Service-Oriented Architecture (SOA) promises a new generation of information systems applications based on a new set of standards for enabling self-describing interoperable Web services. Web service orchestration and choreography are both concerned with the composition of Web services to meet the needs of business processes. There are two important standards for modeling and implementing work-flows and business processes based on Web services: BPEL follows the orchestration paradigm, and WS-CDL covers the choreography. This paper gives a formal methods focused survey of BPEL and WS-CDL languages. Basic language constructs are presented as core building blocks for business processes. From the perspective of composing Web services to execute business processes, the orchestration is a more flexible approach compared to the choreography. Existing work concentrated on web service orchestration aspects using formal models. But it has not considered significant QOS parameter like overall web service turnaround time which is a key parameter to evaluate the quality of web service orchestration. In this paper we are proposing QOS-aware Web service orchestration that translates the QOS requirements of the customers into those of its component Web services using the Collaborative Filtering Approach.