A Quality of Service Broker Based Process Model for Dynamic Web Service Composition

Abstract

Problem statement: With fast spreading of web services technology ove r the Internet, the quality aspects of a web service has received signi ficant attention to the practitioners. The quality of web service includes both functional and nonfunctio nal details. In order to provide the correct and meaningful information to web service consumer, sometimes there is a need to compose existing web services in order to create new web service. Approach: We have proposed a Quality of Service (QoS) broker based process model for Dynamic Web Service Composition (DWSC). The QoS broker in the proposed model is responsible for web servic e collection, selection, optimization and composition based on the service consumer's require ments. It also verifies and certifies the functiona l and QoS specifications provided by service provider at the time of web service registration before publishing it in Universal Description, Discovery a nd Integration (UDDI) registry. The detailed working of QoS broker is also presented in the stud y with functionality of each component. We will also discuss the process flowchart for new web serv ice registration and web service composition at runtime. Results: The proposed QoS broker based model for dynamic web service composition solves the problems associated with quality of web service. It also prevents the central repository from malicious service provider to publish wrong in formation. Conclusion: The QoS broker-based process model for dynamic web service composition guarantees the quality of delivered service to web service consumers and improve the efficiency of composition.