Runtime Monitoring Composite Web Services Through Stateful Aspect Extension

The execution of composite Web services with WS-BPEL relies on externally autonomous Web services. This implies the need to constantly monitor the running behavior of the involved parties. Moreover, monitoring the execution of composite Web services for particular patterns is critical to enhance the reliability of the processes. In this paper, we propose an aspect-oriented framework as a solution to provide monitoring and recovery support for composite Web services. In particular, this framework includes 1) a stateful aspect based template, where history-based pointcut specifies patterns of interest cannot be violated within a range, while advice specifies the associated recovery action; 2) a tool support for runtime monitoring and recovery based on aspect-oriented execution environment. Our experiments indicate that the proposed monitoring approach incurs minimal overhead and is efficient. This work is supported by the National Natural Science Foundation of China under Grant Nos. 60673112, 90718033, the National Basic Research 973 Program of China under Grant No. 2009CB320704, and the High-Tech Research and Development 863 Program of China under Grand Nos. 2006AA01Z19B, 2007AA010301.