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Research on Transaction Web Service Selection Algorithm in WSC |
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PP: 725-731 |
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Author(s) |
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Hu jingjing,
Zhao xing,
Cao yuanda,
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Abstract |
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| Web service composition (WSC) needs transactional support to guarantee its consistent and reliable execution. To improve
the validity of service selection, a transaction service composition model (TSM) is proposed. The model associates the quality of
service (QoS) with dependencies between transactional states and time. Based on the model, a parallel algorithmłłtransaction QoS
selection algorithm (TQSA) is developed, which combines genetic algorithm (GA) and service compensation computing, and can be
applied to dynamic service composition due to its mechanism of selection and evaluation performing at the same time. To improve
the success of composition, an algorithm I-TQSA is further developed by optimizing evolution strategy. Experiment results show that
TQSA resolves the QoS-aware selection NP-hard complete problem, and I-TQSA further improves the effectiveness of selection and
reduces composition time. |
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