Reconfiguration of Adaptors Based on Trace Compliance in Cloud Service Composition

Aiming at the problem that exsiting approaches for run-time adaptation can not support reconfiguration of adaptors in evolving cloud computing environments, an automatic approach for adaptor reconfiguration in the running phase is proposed. By introducing the notions of history trace compliance and future trace compliance, the validity of an adaptor instance under the definition of a new adaptor version is determined. Then, the algorithms for reconfiguration of adaptors are presented and can be used for determining the migratability of an adaptor instance and the corresponding target state of reconfiguration. The effectiveness and feasibility of the approach is illustrated by a case study.