QoS-enabled and self-adaptive connectors for Web Services composition and coordination

This paper presents a methodology for Web Service composition and coordination based on connectors which are defined by Web Service client and automatically generated by the COMPOSITOR tool we have developed. Connectors use contracts to express the non-functional requirements and the behaviour desired by the client of a service, such as QoS (Quality of Service) features. The connectors generated are self-adaptive. The adaptation enactment is based on using an OWL ontology of the server domain which makes it possible to adapt any mismatch in a call to a service at run-time when the server is updated or replaced.