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Interaction Choreography Model

by Benedikt Liegener last modified Apr 26, 2012 23:23
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Definitions

Term:
Interaction Choreography Model
Domain: Cross-cutting issues
Engineering and Design
(KM-ED)
Adaptation and Monitoring
(KM-AM)
Quality Definition, Negotiation and Assurance
(KM-QA)
Generic
(domain independent)
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Business Process Management
(KM-BPM)
The Business Process Design should be deduced from the Interaction Choreography model. The Interaction Choreography model states "What" the business process must do and not "How" it must do it. The business process design may either be manually or automatically deduced from the interaction choreography model. For instance, if the interaction choreography model is a set of declarative constraints about what a business process must achieve then solving the set of constraints results in a business process that satisfies the interaction choreography.
Adaptation and monitoring are continually required in a business process to satisfy the global requirements in the interaction choreography model.Adaptation of the design must take place when monitoring shows that the requirements in the interaction choreography model are unsatisfied.
The interaction choreography model may specify constraints on the QoS aspects of the business process. These constraints need to be satisfied by the business process in order to conform to the interaction choreography model.

Service Composition and Coordination
(KM-SC)
Interaction between atomic services in a composite service must satisfy the requirements of the interaction choreography model. Unlike an orchestration where the interaction between atomic services is specified, the interaction between services must be derived and may change over time in order to conform to the global interaction choreography model. The local atomic service interactions must realize the global interaction choreography model.
Local interactions between atomic services must result in emergent global properties defined in the interaction choreography model. Adaptation consists of determination of these local interactions that will, perhaps over time, give rise to a required global interaction. A monitoring service must gather information that will help the adaptation service guide the emergence in the right direction by selecting appropriate local interactions.

Interaction Choreography Model is a choreography model that starts from the global point of view, by combining elementary interaction blocks (request-response, one-way communication, etc.) towards higher levels of complexity[PO-JRA-2.2.1], [Decker et al, 2008]. Data and control flow are defined globally, therefore the interaction choreography approaches allow to model locally unenforceable interactions: additional synchronization messages are needed to construct a locally enforceable collaboration model. Examples of interaction modelling choreography languages: Let’s Dance [Zaha et al, 2006], WS-CDL [Kavantzas et al, 2005]  {SYN: Interaction Model} {GEN: Service Choreography}
Service Infrastructure
(KM-SI)




Generic
(domain independent)




 

Competencies

 

References

  • [PO-JRA-2.2.1] Overview of the State of the Art in Composition and Coordination of Services
  • [Decker et al, 2008] G. Decker, O. Kopp, and A. Barros, “An Introduction to Service Choreographies,” Information
    Technology, vol. 50, no. 2, pp. 122–127, Februar 2008.
  • [Zaha et al, 2006] J. M. Zaha, A. Barros, M. Dumas, and A. ter Hofstede, “A Language for Service Behavior
    Modeling,” in CoopIS, Montpellier, France, Nov 2006.
  • [Kavantzas et al, 2005] N. Kavantzas, D. Burdett, G. Ritzinger, and Y. Lafon, “Web Services Choreography Description
    Language Version 1.0, W3C Candidate Recommendation,” Tech. Rep., November 2005, http://www.w3.org/TR/ws-cdl-10.

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