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Linked USDL Agreement: Effectively Sharing Semantic Service Level Agreements on the Web
The document discusses the development of a linked USDL agreement model aimed at enhancing the sharing and automation of service level agreements (SLAs) on the web, particularly in cloud computing scenarios. It identifies challenges with existing SLA descriptions and proposes a solution that includes competency questions to better structure SLA understanding and evaluation. Future work will focus on improving tooling and implementing a service marketplace based on the linked USDL framework.
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Linked USDL Agreement: Effectively Sharing Semantic Service Level Agreements on the Web
- 1. 22nd IEEE InternationalConference on Web Services – ICWS 2015 Effectively Sharing Semantic Service Level Agreements on the Web Linked USDL Agreement José María García, Carlos Pedrinaci, Manuel Resinas, Jorge Cardoso, Pablo Fernández, Antonio Ruiz-Cortés
- 2. Outline • Introduction • UseCase • Linked USDL Agreement • Evaluation and Tooling • Conclusions and Future Work 2
- 3. Introduction • Service marketis growing • Service descriptions are available • But… 3
- 4. Challenges on SLAdescriptions • Limited support to Quality of Service (QoS) and Service Level Agreement (SLA) descriptions • Existing SLA models problems Main focus was on technical, WS-* services No shared meaning of the content Not shareable on the Web Limited tooling support 4
- 5. Requirements for oursolution • Extension to Linked USDL Linked Data based model to describe various aspects of services • Lightweight schema Easy to use & understand • Promotes sharing Following Web/Linked Data principles • Support automation for Service Level Management Available tools • Evaluated with real use cases Cloud Computing scenario 5
- 6. Use case drivendesign • Use case scenario on cloud computing • Competency questions need to be answered by our model • Taking into account existing SLA models • Additional scenarios, such as software consultancy contracts 6
- 7. Competency Questions (I) •Which functionality and quality levels does a service provide? 7
- 8. Competency Questions (II) •Which service properties are guaranteed to have certain values? 8
- 9. Competency Questions (III) •Which compensation will a user obtain if the guaranteed value of some property is not provided? 9
- 10. Competency Questions (IV) •Who is responsible for enforcing the guaranteed values? 10
- 11. Competency Questions (V) •Who is responsible for monitoring and computing the guaranteed values? 11
- 12. Competency Questions (VI) •What is the assessment period while a guarantee is provided? 12
- 13. Competency Questions (VII) •How service property values are computed? 13
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- 15. Agreement Terms (CQ1,CQ2, CQ3) 15
- 16. Services and EntitiesModeling (CQ4, CQ5) 16
- 17. Agreement Conditions (CQ1,CQ2, CQ6, CQ7) 17
- 18. Evaluation 18 • 13 outof 22 criteria • The rest are not shared by many approaches • Not used in real world SLAs • Some criteria can be covered by extensions
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- 23. Conclusions and FutureWork • Extension to Linked USDL to capture SLAs • Good coverage of SLA lifecycle • Extensible • Future work Improve the tooling with more operations Implementation of a service marketplace based on Linked USDL 23
- 24. Useful resources • LinkedUSDL http://www.linked-usdl.org/ • Model and use cases https://github.com/linked-usdl/usdl-agreement • Demo http://www.isa.us.es/IDEAS/Linked_USDL_Agreement/ 24
- 25. 22nd IEEE InternationalConference on Web Services – ICWS 2015 Effectively Sharing Semantic Service Level Agreements on the Web Linked USDL Agreement José María García josemgarcia@us.es @josemgarcia_us Thank you for your attention!