Monitoring Web Services for Conformance

In this article, we paid more attention on researching how to monitor Web services for checking conformance, where an AOP-based run-time monitoring framework was proposed and explored. In the framework, WS-Policy was firstly used to express the monitoring requirement, then monitoring requirement was described as AOP monitoring logic, Active BPEL engine was extended to weave the monitoring logic and the service core execution logic dynamically, a checking algorithm was introduced to analyze whether the user's monitoring requirement was satisfied according to MREG (Monitoring Requirement Expression Graph) and EMSC (Extended Message Sequence Charts), and finally, some control and modification measures were adopted in order to rise the quality of the service composition.