EFFECTIVE SELF-ADAPTIVE SERVICE COMPOSITION

Web services run in a highly dynamic environment, as a result of which the QoS will change relatively frequently. In order to make the composite service adapt to such dynamic property of web services, we propose an effective and scalable self-adaptive approach for service composition. In order to make the composite service adjust itself as quickly as possible, a way of performance prediction is proposed in this paper. In order to avoid useless re-selections and improve the efficiency of the re-selections, the method for extracting the local constraint is presented. On the basis of these,. the self-adaptive approach is presented including the framework, and the core methods. Experiments show that the proposed solutions are effective in supporting self-adaptive web service composition.