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Dynamic Web Service Composition within a Service-Oriented Architecture Ivan J. Jureta, St´ephane Faulkner Info. Manag. Research Unit (IMRU) University.

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Presentation on theme: "Dynamic Web Service Composition within a Service-Oriented Architecture Ivan J. Jureta, St´ephane Faulkner Info. Manag. Research Unit (IMRU) University."— Presentation transcript:

1 Dynamic Web Service Composition within a Service-Oriented Architecture Ivan J. Jureta, St´ephane Faulkner Info. Manag. Research Unit (IMRU) University of Namur, Belgium Youssef Achbany, Marco Saerens Info. Syst. Research Unit (ISYS) Universit´e de Louvain, Belgium {youssef.achbany, 2007 IEEE International Conference on Web Service (ICWS 2007)

2 Outline Introduction Service Center Architecture Randomized RL Algorithm Experimental Result Conclusion and Future Work

3 Introduction Managing the complexity of systems is considered a key challenge in computing and is addressed through various approaches aimed at increased automation. Service center openness resource distribution adaptability

4 Service Center Architecture Contain one Mediator and all distinct Web Service Mediator negotiates observe compose RRL(Randomized Reinforcement learning) - guide Mediators composition behavior

5 Service Center Architecture Definition 1 - a Web Service (WS) w. Definition 2 - Definition 3 - a Composite Web Service (CWS)

6 Service Center Architecture Definition 4 - a Service Request(SReq) - Definition 5 - Definition 6 - a Service Center(SC) c

7 Service Center Architecture Definition 7 - Service Support Center(SSC) Definition 8 - SCA,

8 Randomized RL Algorithm CWS provision problem

9 Randomized RL Algorithm Definition 9 - the degree of exploration Definition 10 -, To minimizing total expected cost -

10 Randomized RL Algorithm Computing the Optimal TA Policy update the estimated WS criterion

11 Experimental Results

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14 Conclusions and Future Work Outperforming standard -greedy and naive Boltzmann. Experimentation of architecture and the extension of service graph specifications


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