| 摘要: |
| 在服务规则库的基础上,介绍了回溯树与完备回溯树的概念,并证明了其重要性质.提出了基于回溯树的Web服务自动组合方法.该方法采用分步分治的思想进行服务的自动组合:1) 针对用户请求的输出对象生成完备回溯树;2) 在完备回溯树中选取最佳生成源(生成路径);3) 将生成路径合成为可执行的流程服务.与已有的基于图搜索的自动Web服务组合方法相比,该方法极大地减小了搜索空间,避免了循环搜索,能够满足单目标和多目标的用户请求.仿真实验结果表明,该方法能够在大规模的服务规则库中进行快速的服务组合,从而满足用户请求. |
| 关键词: 面向服务的体系架构 Web服务 服务组合 回溯树 流程服务 |
| DOI： |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant Nos.60603025, 60503018 (国家自然科学基金); the National High-Tech Research and Development Plan of China under Grant No.2006AA01Z171 (国家高技术研究发展计划(863)); the National Key Technology R&D Program of China under Grant No.2006BAH02A01 (国家科技支撑计划); the Natural Science Foundation of Zhejiang Province of China under Grant No.Y105463 (浙江省自然科学基金) |
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| Automatic Web Service Composition Based on Backward Tree |
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DENG Shui-Guang,WU Jian,LI Ying,WU Zhao-Hui
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| Abstract: |
| An approach based on backward tree to compose services automatically is proposed. It composes services for a user through three steps: 1) Builds a complete backward trees on-line; 2) Searches for optimal valid generation sources (generation-paths); 3) Composes generation paths. Compared to traditional graph-based methods, it has a smaller search space and avoids the repetition search. Experimental results show that this method has a good performance even the repository has a large number of services. |
| Key words: SOA (service-oriented architecture) Web service service composition backward tree flow service |
