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2005. 10. 12 Dugki Min Konkuk University

Web Services Quality Model. 2005. 10. 12 Dugki Min Konkuk University. Contents. Background Motivation Definition of Terms WSQM Quality Activity of WS Quality Associates of WS Quality Factors of WS Related WS Specifications Future Work. Background.

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2005. 10. 12 Dugki Min Konkuk University

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  1. Web Services Quality Model 2005. 10. 12 Dugki Min Konkuk University

  2. Contents • Background • Motivation • Definition of Terms • WSQM • Quality Activity of WS • Quality Associates of WS • Quality Factors of WS • Related WS Specifications • Future Work

  3. Background • Web Services become popular infrastructure for service-oriented integration • Business Web Services • Grid Web Services • Mobile Web Services • Ubiquitous Web Services • Web Services are valuable only if whose service qualities are satisfied by the consumers and guaranteed continuously.

  4. Motivation • Everybody uses the term, WS Quality, and says it is important. • WSDM • UDDI • Service Contract • But, there is no clear-cut definition of what WS Quality is. • We need to have • Common Model of WS Quality => Web Service Quality Model • Common Language to describe WS Quality => Web Service Quality Description Language

  5. Definition of Terms • Quality : The totality of features and characteristics of a product or a service that bear on its ability to satisfy stated or implied needs. (ISO/IEC 9000) • Quality Model : The set of quality-related actors, activities, characteristics of a product or a service and the relationship between them which provide the basis for specifying quality requirements and evaluating quality

  6. WS Quality • Quality in Service-Level • In Use • In Management

  7. WSQM Quality Model Search, Negotiation, Contract, Implementation, Test, Deployment,… Quality Factors (Attributes) Quality Associates Quality Activity Business Value Quality Service Level Measurement Quality Interoperability Quality Business Processing Quality Manageability Quality Security Quality Development Quality contract Management Quality contract Appropriation Quality contract Service Stakeholder Service Developer Service Provider Service Administrator (or operator) Consumer QoS Manager QoS Broker (Assuror)

  8. Quality Activity of WS Example of Quality Activity • Development Quality Contract: • between Stakeholder and Developer • Delivery time, Interoperability, Usability, Security • Management Quality Contract: • between Provider and Quality Manager • Manageability, Composability Development Quality Contract ServiceDeveloper ServiceDevelopment Service stakeholder Service Operation & Management ServiceProvider ServiceBroker Service Quality Contract Management Quality Contract ServiceConsumer Quality Manager Service user

  9. Quality Associates for WS • Consumer & Provider • Stakeholder • Has a ownership of WS and requires WSQ to a developer • Uses WSQM in Quality Inspection Procedure • QoS Broker • Registers WS with quality properties and connect consumer and provider • Monitors whether registered WS keep a quality level • Quality Assuror • Guarantees WSQ by monitoring and controlling the quality level • Focus on Legal Assurance • 3rd Party Quality Manager(3PQM) • Deputy manager of WS-provider • Monitors and manages system to secure required quality level from outside • Focus on Technical Management

  10. Quality Associates for WS

  11. Quality Factors (Attributes) of WS

  12. Related WS Specifications • SLA Contract Standards • WSLA (IBM): Management by service level agreement • WS Management Standards • WSMF (HP): Layered Management Framework • WS-Manageability(IBM): Manageability Metamodel in type of Topic • WSDM 1.0 (OASIS): OASIS standard • MUWS: Composability + Manageability • MOWS: Manageability • Other related: • WS-Addressing: to find WS resources • WS-Notification: to notify change in resource state

  13. Future Work • Subject to WSQM TC

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