Monitoring probabilistic SLAs in Web service orchestrations

Abstract

Web services are software applications that are published over the Web, and can be searched and invoked by other programs. New Web services can be formed by composing elementary services, such composite services are called Web service orchestrations. Quality of Service (QoS) issues for Web service orchestrations deeply differ from corresponding QoS issues in network management. In an open world of Web services, service level agreements (SLAs) play an important role. They are contracts defining the obligations and rights between the provider of a Web service and a client with respect to the services' function and quality.