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Issue No. 12 - December (2011 vol. 22)
ISSN: 1045-9219
pp: 2008-2021
Hongxia Tong , Chinese Academy of Sciences, Beijing
Jian Cao , Shanghai Jiaotong University, Shanghai
Shensheng Zhang , Shanghai Jiaotong University, Shanghai
Minglu Li , Shanghai Jiaotong University, Shanghai
Agent-based service composition has provided a promising computing paradigm for the automatic web service composition. In this paper, a formal service agent model is proposed, which integrates the web service and software agent technologies into one cohesive entity. Based on the service agent model, a distributed planning algorithm for web service composition called DPAWSC is presented. DPAWSC formalizes web service composition into a graph search problem according to the dependence relations among service agents. The key to DPAWSC is that the alternative solution with smaller length has higher priority to be searched than one with larger length. DPAWSC is based on the distributed decision making of the autonomous service agents and addresses the distributed nature of web service composition. We evaluate the algorithm by simulation experiments and the results demonstrate that DPAWSC is effective for its ability to produce the high quality solution at a low cost of communications.
Distributed planning algorithm, web service composition, software agent, service agent model.

H. Tong, M. Li, J. Cao and S. Zhang, "A Distributed Algorithm for Web Service Composition Based on Service Agent Model," in IEEE Transactions on Parallel & Distributed Systems, vol. 22, no. , pp. 2008-2021, 2011.
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