پاورپوینت کامل Service Orientation 74 اسلاید در PowerPoint

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پاورپوینت کامل Service Orientation 74 اسلاید در PowerPoint

اسلاید ۴: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۴Main ingredientsServicesService descriptionsMessagesImplementation: through web services

اسلاید ۵: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۵Other exampleCitizen looking for a house:Check personal data System X Check tax history System Y Check credit history System Z Search rental agencies System A,B …

اسلاید ۶: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۶What’s a servicePlatform-independent computational entity that can be used in a platform-independent wayCallable entities or application functionalities accessed via exchange of messagesComponent capable of performing a taskOften just used in connection with something else: SOA, Web services, …

اسلاید ۷: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۷What’s a service, cnt’dShift from producing software to using softwareYou need not host the softwareOr keep track of versions, releasesNeed not make sure it evolvesEtcSoftware is “somewhere”, deployed on as-needed basisSaaS: Software as a Service

اسلاید ۸: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۸Key aspectsServices can be discoveredServices can be composed to form larger servicesServices adhere to a service contractServices are loosely coupledServices are statelessServices are autonomousServices hide their logicServices are reusableServices use open standardsServices facilitate interoperability

اسلاید ۹: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۹Service discoveryService registryService providerService requestorlookupbindpublish

اسلاید ۱۰: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۱۰Service discoveryRental agency 1Rental agency 2Rental agency 2Municipality systemApartment(immediate, cheap)publishAgency 1ApartmentRental agreementRental agency 1Rental agency 1

اسلاید ۱۱: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۱۱Service discoveryDiscovery is dynamic, each invocation may select a different onePrimary criterion in selection: contractSelection may be based on workload, complexity of the question, etc optimize compute resourcesIf answer fails, or takes too long select another service more fault-tolerance

اسلاید ۱۲: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۱۲Is discovery really newMany design patterns loosen coupling between classesFactory pattern: creates object without specifying the exact class of the object.

اسلاید ۱۳: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۱۳Services can be composedService can be a building block for larger servicesNot different from CBSE and other approaches

اسلاید ۱۴: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۱۴Services adhere to a contract Request to registry should contain everything needed, not just functionalityFor “normal” components, much is implicit:Platform characteristicsQuality informationTacit design decisionsTrust promisesQuality of Services (QoC), levels thereofService Level Agreement (SLA)

اسلاید ۱۵: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۱۵Service discoveryRental agency 1Rental agency 2Rental agency 1Municipality systemApartment(immediate, cheap)Agency 1ApartmentRental agreement

اسلاید ۱۶: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۱۶Services are loosely coupledRental agencies come and goNo assumptions possible Stronger than CBSE loose coupling

اسلاید ۱۷: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۱۷Services are statelessRental agency cannot retain information: it doesn’t know if and when it will be invoked again, and by whom

اسلاید ۱۸: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۱۸Services are autonomous, hide their logicRental agency has its own rules on how to structure its processIts logic does not depend on the municipality service it is invoked byThis works two ways: outside doesn’t know the inside, and vice versa

اسلاید ۱۹: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۱۹Services are reusableService models a business process:Not very fine grainedCollecting debt status from one credit company is not a service, checking credit status isDeciding on proper granularity raises lots of debate

اسلاید ۲۰: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۲۰Service use open standardsProprietary standards vendor lockinThere are lots of open standards:How services are describedHow services communicateHow services exchange dataetc

اسلاید ۲۱: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۲۱Services facilitate interoperabilityBecause of open standards, explicit contracts and loose couplingClassical CBSE solutions pose problems:Proprietary formatsPlatform differencesEtcInteroperability within an organization (EAI) and between (B2B)

اسلاید ۲۲: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۲۲OverviewServices, service description, service communicationService-Oriented Architecture (SOA)Web servicesSOSE: Service-Oriented Software Engineering

اسلاید ۲۳: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۲۳Service-Oriented ArchitectureArchitecture: the fundamental organization of a system in its components, their relationships to each other and to the environment and the principles guiding its design and evolutionSOA: Any system made out of services

اسلاید ۲۴: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۲۴What is SOAInfrastructure service layerOrchestration/coordination layerBusiness services layerservice busserviceserviceserviceservicelogicalphysical

اسلاید ۲۵: SE, Servic Orientation, Hans van Vliet, ©۲۰۰۸۲۵Service busEvent-based messaging engineOrigin: EAI, solve integration problemsOften takes care of:Mediati