Dynamic Service Replacement to Improve Composite Service Reliability

Service-oriented architecture (SOA) provides an ability to satisfy the increasing demand of the customer for complicated services in business environments via the composition of service components scattered on the Internet. Service composition is a mechanism to create a new service by the integration of several services to meet complex business goals. Web services are frequently exposed to unexpected service faults in network environments, because most SOA has been recently realized in the area of web services. Thus, services participating in the service composition cannot always be free of service faults, thereby decreasing the reliability of service composition. It is necessary to improve the reliability of the service composition to provide a reliable service. In this paper, we focus on the availability of a web service and propose a technique to improve service composition reliability using the web service-business process execution language (WS-BPEL) to support successful service composition. The proposed technique performs dynamic service replacement with the WS-BPEL extension. This is combined as the concept of the aspect-oriented programming when a web service fault is detected. We can prevent the failures of composite web service from unexpected service faults using our technique.