A Meta-Model Based Proposal for QOS of WSCDL Choreography

Quality of service (QOS) of a choreography is dependent on the quality of service of participating roles. Recently, a proposal has been made to extend the meta model of WSDL to include QOS parameters. These parameters include reliability, availability and demand. In this paper we propose a multidimensional model of quality of service of a choreography based on above proposed extensions. Our proposal describes the QOS of a choreography in terms of QOS of dominant role, dominant relationship and dominant interaction. Dominant role and dominant relationship are identified by analyzing relationships and interactions where as dominant interaction is based on dominant operation. A dominant operation has maximum arrival rate of request.QOS attributes of dominant role are same as that of roles. Further, we also proposed rules for estimation of QOS of dominant relationship and dominant interaction. We demonstrate our proposal through an example.