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اسلاید 1: Service Oriented Design III Service Oriented Design605.702 Service Oriented Architecture Johns-Hopkins UniversityMontgomery County Center, Spring 2009Lecture 11: April 20, 2009Instructor: T. Pole
اسلاید 2: Agenda (for the week)Tonight, 4/20/09Ch 15: Service Oriented Design Part II Service DesignReview Analysis and DesignChapters 11 through 15Wednesday, 4/22/09Example Project, Analysis and Design TemplatesNot complete artifacts, just outlinesReusable/Legacy Components, version 2Class Project Working Session
اسلاید 3: Ch 15: Service Oriented Design Part III Service DesignOverview of Goals and StrategyGoalsEncapsulate the required logicConform to service oriented principlesMeet business requirementsStrategy, order of stepsDesign entity centric servicesDesign application servicesDesign task centric business oriented servicesDesign process services Control services, orchestrations and choreographiesMore details later in this lecture
اسلاید 4: Review Analysis and DesignChapters 11 through 15Service Oriented AnalysisService ModelingService Oriented Architecture CompositionService Design
اسلاید 5: Service Oriented AnalysisPrimary questions:What services need to be built?What logic should be encapsulated by each service?Overall goals (i.e. steps or tasks):Define preliminary set of service OPERATION candidatesGroup operation candidates into logical contexts which are candidate servicesSO Principles:Identify reuse potentialEnsure contexts make sense (have a logical basis)Identify issues that may impact service autonomyDefine known preliminary composition models
اسلاید 6: Service ModelingModel Candidate ServicesDecompose business processesIdentify automatable process stepsAlso known as, filter out unsuitable stepsDifferentiate between process-agnostic and process-specific logicIdentify candidate service compositionIdentify, refine and finalize definition of service candidatesIdentify, refine and finalize definition of services compositions
اسلاید 7: Text Book: Service Modeling Case Study 12.4 Contrasting service modeling approaches (an example)Approach #1: Deriving hybrid servicesApproach #2: Deriving entity-centric servicesApproach #3: Mixing task-centric and entity-centric services
اسلاید 8: Service Oriented Architecture CompositionCompose SOAChoose Service LayersExisting Services, SOA applications, etc.Enterprise StandardsComposition Performance ConsiderationsPosition Core StandardsIndustry StandardsWill you use UDDI?Choose SOA ExtensionsWhich extensions will you use in which compositions?
اسلاید 9: Service DesignEntity-Centric Business Service Design ProcessEstablish the business service layer, fig 15-1Case study pp 503-521Application (Utiltiy) Service Design ProcessEstablish the utility service layer, fig. 15-10Case study pp 524-538Task-Centric Business Service DesignComplete the business service layer(s), fig. 15-15Case study pp 541-554Process (Control) Service DesignEstablish the control layerChapter 16 – mostly but not completely beyond the scope of the class project
اسلاید 10: Entity-Centric Service DesignReview existing servicesDefine entities (schema)Define abstract interfaceApply Service Oriented principlesStandardize service interfaceExtend service designIdentify other (non-entity) services
اسلاید 11: Application (Utility) Service DesignReview existing servicesConfirm contextDerive candidate (initial) interfaceApply service oriented principlesStandardize service interfaceApp “speculative” features
اسلاید 12: Task-Centric Design ServiceDefine workflow logicDefine initial interfaceApply service oriented principlesStandardize service interfaceIdentify other required services
اسلاید 13: Control Service Desig
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