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Web Service Middleware – An Infrastructure For Near Future Real Life Web Service Ecosystems

Web Service Middleware – An Infrastructure For Near Future Real Life Web Service Ecosystems. IEEE International Conference on Service-Oriented Computing and Applications (SOCA’07).

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Web Service Middleware – An Infrastructure For Near Future Real Life Web Service Ecosystems

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  1. Web Service Middleware – An Infrastructure For Near Future Real Life Web Service Ecosystems IEEE International Conference on Service-Oriented Computing and Applications (SOCA’07) Jan Schulz-Hofen SAP Research Center Palo Alto SAP Labs, LLC, Palo Alto, CA 94304,USAHasso-Plattner-Institute for Software System Engineering University of Potsdam, Potsdam, Germany 報告學生：69621509 鄭巧玟　　指導教授：吳秀陽

  2. Outline • Introduction • Preliminaries • Developing a Web Service Middleware • Considerations for operation of a Web Service Middleware • Conclusion

  3. Introduction • Build the Web Service ecosystem • Service broker • Charging and payment facility • Authenticated and fulfillment • Proposes a supporting infrastructure

  4. Preliminaries • Service-oriented Architecture • Web service Ecosystem • Scenario

  5. SOA structure Generic organizational structure in an SOA

  6. Web Service Ecosystem Service supply and distribution supported in the web service ecosystem framework Alistair Barros, Marlon Dumas, and Peter Bruza. “ The Move to Web Service Ecosystem. “ BPTrends, November 2005

  7. Scenario Web Service Ecosystem scenario at design and time

  8. Developing a Web service middleware • Registry • Charging and Penalization • Monitoring and Fulfillment • QoS Statistics • Authentication

  9. Registry architecture

  10. Registry properties • Service Instance • Price • QoS Guarantee • A reference to a service type • Service Type • Functional properties described in human-readable text and keywords • A set of call parameters and their data types • Service Queries and WSDL Identity

  11. Service instances data structure

  12. Service type data structure

  13. Charging and penalization • Between service requestors and providers are the lack of natural and mutual trust • Organizational borders or at least bound to predefined long-term business agreements • Like unfulfilled service guarantees or unjustified invoices can quickly emerge to major problems and to renunciation of participants from ecosystem • Two main facilities of the service broker • Charging • penalization

  14. Monitoring and Fulfillment • Between requestor and provider and inserts a monitoring interceptor • Log each service request and response • Forward all messages to the respective receiver transparently • Intercepting machines and trust issues • The interceptor has a direct connection to the fulfillment analyzer • Read access to the specified Qos properties of each service • Evaluate whether or not guarantees have been adhered to as well as how much each service invocation has costced

  15. Charging and penalization structure

  16. QoS Statistics • Statistics prove stability for a certain QoS level • Offering only those weak QoS properties would most probably be traded at a lower price • Allowing for small competitors to enter the market and to introduce strong QoS guarantees at a later point in time

  17. QoS broker architecture Tao Yu Kwei-Jay Lin. “ A Broker-based Framework for QoS-aware Web Service Composition. “ eee, 00:22-29, 2005

  18. Authentication facility

  19. Considerations for operation of a web service middleware • Operator • Procurement

  20. Operator • A high level of trust must be committed by service requestors and providers • The operator has to ensure the faultless operation of all facilities

  21. Procurement of middleware facilities

  22. Procurement • Authentication • Google accounts • Microsoft passport • Payment • Paypal • Moneybookers • Monitoring • VeriSign • Thawte • Statistics

  23. Conclusion • Web service ecosystem an approach to realize a supporting and market-building infrastructure which Web service middleware • Assessment • Exhaustive service description • Uniqueness of service type descriptions • Trustworthy operation of message interceptors • Outlook • Service adaptation and mediation • Business transactions • Transaction management • More sophisticated semantics in service description

  24. END • 謝謝大家!!

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