Abstract
In service oriented computing, web services are combined to meet the interoperability demands in different heterogeneous and distributed applications. However, incisively measuring the control flow complexity of Web Service Composition (WSC) is not an easy task due to characteristics of distributed, loose-coupling, and heterogeneity. In Service Oriented Architecture (SOA), Business Process Execution Language (BPEL) is used to describe the combination of web services. This paper mainly focuses on the complexity measurement of web service composition from BPEL. Petri-net is one of the models to represent the work flow. The BPEL of WSC is converted into Petri-net based model and by extracting the information of places, transitions, and their interrelationship; the complexity is measured for that Petri-net model. Two metric sets are considered for analysis of the WSC's complexity, which are identified by studying the workflow's execution dependency relations. The first metric set describes the static features, and second metric set describes about the dynamic complexity of business process.
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