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Web Services Choreography Description Language (WS-CDL) Jacek Kopecký June 2004.

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Presentation on theme: "Web Services Choreography Description Language (WS-CDL) Jacek Kopecký June 2004."— Presentation transcript:

1 Web Services Choreography Description Language (WS-CDL) Jacek Kopecký June 2004

2 2 Jacek Kopecký, jacek.kopecky@deri.org What is WS-CDL? Web Services Choreography Description Language Early draft by W3C WS-Chor Working Group No support from IBM, MS Apparently initially from Oracle Wild guess at Last Call sometime in 2005 Main editor working on formalization

3 June 20043 Jacek Kopecký, jacek.kopecky@deri.org WS-CDL Overview Global view of the observable behavior of a set of Web Services Modeling as documentation Central, top-down approach Not executable process Local choreographies can be generated from WS-CDL Also skeletons for orchestration

4 June 20044 Jacek Kopecký, jacek.kopecky@deri.org WS-CDL Usage Picture

5 June 20045 Jacek Kopecký, jacek.kopecky@deri.org WS-CDL Package Package root element Sets target namespace Allows importing Contains all further definitions Especially one or more choreographies importDefinitions* informationType* token* tokenLocator* role* relationship* participant* channelType* Choreography-Notation*

6 June 20046 Jacek Kopecký, jacek.kopecky@deri.org Data Concepts Information type Independence of schema Token, token locators Accessing same information in diverse sources informationType tokensvars type XML Schema Other type System ref Token orderID messageslocators

7 June 20047 Jacek Kopecký, jacek.kopecky@deri.org Data Concepts (2) Channel For communication with a participant Dynamic, actual endpoint in data Can be passed around Variables Information exchange, state, channel variables Reside in Roles

8 June 20048 Jacek Kopecký, jacek.kopecky@deri.org Participants & Roles Roles Enumerate behaviors, optionally linked to WSDL interfaces Participants Play one or more roles Apparently not used in WS-CDL Relationships Associate specific behaviors of two roles “for a purpose” Complex relationships broken down to pairs

9 June 20049 Jacek Kopecký, jacek.kopecky@deri.org Participants & Roles Figure Role 1 Behavior A Role 2 Behavior X relationships Participant I Participant II Play role(s)

10 June 200410 Jacek Kopecký, jacek.kopecky@deri.org Choreography The main thing WS-CDL defines Scoping variables, exception handling and finalization Finalization unclear Contains a single activity Initiated by a message

11 June 200411 Jacek Kopecký, jacek.kopecky@deri.org Choreography Syntax * * ?......... ?

12 June 200412 Jacek Kopecký, jacek.kopecky@deri.org Activities Perform actual work Ordering structures (complex activities) Sequence, parallel Choice – implicit selection by incoming message WorkUnits (guarded activities) Condition and repetition for activity Optionally blocking on data availability Example on next slide Variable assignment Create or update a variable in a role NoAction non-observable effects

13 June 200413 Jacek Kopecký, jacek.kopecky@deri.org WorkUnit Example ...

14 June 200414 Jacek Kopecký, jacek.kopecky@deri.org Activities (2) Interaction Roles within a relationship communicate/align information and state Time-to-complete timeout mechanism Can initiate choreography Performing a choreography Choreography composition Including variable and role aliasing

15 June 200415 Jacek Kopecký, jacek.kopecky@deri.org Interaction Example ...

16 June 200416 Jacek Kopecký, jacek.kopecky@deri.org Perform Syntax +

17 June 200417 Jacek Kopecký, jacek.kopecky@deri.org Q&A Questions, answers Thanks for your attention


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