The research on web service replacement based on workflow

For the issues of the existing method in web service replacement considers weakly the relationship between services, this paper presents a web service replacement method based on BPEL-described workflow. Firstly, studying the relationship between services in BPEL is to determine the scope of the service replacement; Secondly, proposing a hierarchical QoS model, and giving its calculation expression under workflow and selection algorithm; Finally, designing a BPEL preprocess system for service replacement according to replacement technique which this paper proposed. We compare our method with the existing service replacement technique by an experiment, and the experiment results validated the efficiency of the proposed method.