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WSLA Language Specification research.ibm/wsla/

WSLA Language Specification http://www.research.ibm.com/wsla/. WSMO Working Group Presentation Adina Sirbu & Ioan Toma 18 January 2006. Presentation Overview. Short recap of WSLA Framework WSLA Language Parties Service definition Obligations Conclusions. Short recap of WSLA.

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WSLA Language Specification research.ibm/wsla/

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  1. WSLA Language Specificationhttp://www.research.ibm.com/wsla/ WSMO Working Group PresentationAdina Sirbu & Ioan Toma18 January 2006

  2. Presentation Overview • Short recap of WSLA Framework • WSLA Language • Parties • Service definition • Obligations • Conclusions

  3. Short recap of WSLA

  4. WSLA Language • An XML-based language used by both service providers and consumers

  5. Parties • Signatory parties: • Service provider • Service consumer • Supporting parties: • Measurement • Management • Condition evaluation

  6. Service Definition – Service Object • A ServiceObject is an abstraction of all conceptual elements for which SLA parameters and the corresponding metrics can be defined • A ServiceObject includes any number of: Schedules, Triggers, Constants, MetricMacroDefinition, MetricMacroExpansion, SLAParameters and Metrics • ServiceDefinition, Operation and OperationGroup are all subtypes of ServiceObject

  7. Service Definition - SLA Parameter

  8. Service Definition - Metric

  9. Service Definition - Metric

  10. Obligations Service Level Objective Elements: • the obliged party • one or more validity periods • the state = a logical expression • an evaluation event or an evaluation schedule

  11. Obligations Action Guarantee Elements: • the obliged party • the precondition = a logical expression • an evaluation event or an evaluation schedule • the qualified action • the execution modality

  12. Obligations Logic Expressions: • “follow first-order logic” • contain AND, OR, NOT, IMPLIES operators which connect predicates or, again, expressions • could be extended e.g., to contain variables and quantifiers Predicates: • can have SLA parameters and scalar values as parameters • new domain-specific predicates are introduced by extending the abstract predicate type

  13. Conclusions & Relevance to WSMO/L/X • Conclusions • WSLA allows to express: what to measure, how to measure, who does what and guarantees • WSLA Language – a XML based language for specifying SLAs related information • Relevant for: • WSMO -> describe semantically the services of WSLA framework (measurement, evaluation, management) -> QoS representation, reasoning, measurement • WSMT -> the monitoring part (www.alphaworks.ibm.com/tech/ettk) • WSMX -> the negotiation component

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