BPELGEN: An Algorithm of Automatically Converting from Web Services Composition Plan to BPEL4WS

Abstract

Service composition is a key issue in the pervasive computing systems ofservice orientation. Automatically converting web services composition plans into BPEL4WS is an essential step in SASO (Semantic and Automatic Service Orchestration system). In this paper, we employ DAG to represent web services composition plans, and propose an automatic conversion algorithm BPELGEN which automatically converts the DAG into BPEL4WS through dynamic code generation at runtime. There are three main characteristics of the algorithm.(1) automatically converting web services composition plan into BPEL4WS, (2) supporting nestedflow process generation; (3) the BPEL4WS generated by the algorithm satisfying data dependency and execution dependency ofthe composition plan.

Towards Workflow Oriented Virtual Enterprise Based on Policy Driven and Multi-agent Service Composition

“…Workflow generating module will be responsible for establishing a service execution plan, which is workflow oriented. It will use BPEL4WS to specify the control flow (i.e., the order and rules controlling conversations between participating Web services) and the data-flow (i.e., the messages exchanged between the composed services) [13,14]. The semantics of BPEL4WS depend on WSDL, XML Schema and XPath.…”