电政大三下-包-系统分析与设计chap8w

ysis&chapter8 YangYI,ComputerScienceDepartment, Chapter8 主要内Objectives:Use- ExplainthepurposeofUse- ysisandwhereinthelifecycleitisIdentifytheclasseswhichperformausecaseflowofeventsDistributetheuse-casebehaviortothoseclasses,identifyingresponsibilitiesoftheclassesDevelopUse-CaseRealizationsthatmodelthecollaborationsbetweeninstancesoftheidentifiedclassesUse- ysisin

合合 [[早期精化迭代[初启迭代[定义备选架构Use- ysis第八章用例主要内Use- ysisSupplementtheUse-CaseForeachUse-CaseFindClassesfromUse-CaseDistributeUse-CaseBehaviortoForeach ysisDescribeDescribeAttributesand ysis ysisSupplementtheUse-CaseUse- ysisSupplementtheUse-CaseForeachUse-CaseFindClassesfromUse-CaseDistributeUse-CaseBehaviortoForeach ysisDescribeDescribeAttributesand ysis ysisReview:Use-CaseysisClasses:AFirstStepTowardExecutablesFindClassesfromUse-CaseThecompletebehaviorofausecasehastobedistributedtoysisclassesBoundaryIntermediatesbetweentheinterfaceandoutsidetheSeveralUserinterfaceDeviceinterfaceOneboundaryclassperactor/use-caseTheRoleofaBoundaryExample:FindingBoundaryOneboundaryclassperactor/usecaseGuidelines:BoundaryUserInterfaceConcentrateonwhatinformationispresentedtotheDoNOTconcentrateontheUISystemandDeviceInterfaceConcentrateonwhatprotocolsmustbeDoNOTconcentrateonhowtheprotocolswillEntity ionsofthesystemTheRoleofanEntityExample:FindingEntityUseuse-caseflowofeventsas ionsoftheuseTraditional,filteringnounsUnderlinenounclausesintheuse-caseflowofRemoveredundantRemovevagueRemoveactors(outofRemoveimplementationRemoveattributes(saveforRemoveExample:CandidateEntityRegisterforCourses(CreateSchedule)ControlUse-casebehaviorMorecomplexusecasesgenerallyrequireoneormorecontrolcasesTheRoleofaControlExample:FindingControlIngeneral,identifyonecontrolclassperuse– ysiscontinues,acomplexusecase’sclassmayevolveintomorethanone020Example:Summary: Use- ysisSupplementtheUse-CaseForeachUse-CaseFindClassesfromUse-CaseDistributeUse-CaseBehaviortoForeach ysisDescribeDescribeAttributesand ysis ysis第八章用例主要内DistributeUse-CaseBehaviortoForeachuse-caseflowof ysisAllocateuse-caseresponsibilities ysis ysisclassinteractionsinGuidelines:AllocatingResponsibilitiesto ysisclassstereotypesasaBoundaryBehaviorthatinvolvescommunicationwithanEntity Behaviorthatinvolvesthedataencapsulatedwithin Control BehaviorspecifictoausecaseorpartofaveryimportantflowofeventsGuidelines:AllocatingResponsibilitiestoClasses(cont.)WhohasthedataneededtoperformtheIfoneclasshasthedata,puttheresponsibilitywiththeIfmultipleclasseshavethePuttheresponsibilitywithoneclassandaddarelationshiptotheCreateanewclass,puttheresponsibilityinthenewclass,andrelationshipstoclassesneededtoperformthePuttheresponsibilityinthecontrolclass,andaddrelationshipsclassesneededtoperformtheTheAnatomyofSequenceExample:SequenceTheAnatomyofCollaborationExample:CollaborationUse- ysisSupplementtheUse-CaseForeachUse-CaseFindClassesfromUse-CaseDistributeUse-CaseBehaviortoForeach ysisDescribeDescribeAttributesand ysis ysis第八章用例主要内OneInteractionDiagramIsNotGoodEnoughDescribeWhatareHowdoIfindExample:ViewofParticipatingClasses(VOPC)ClassDiagramMaintainingConsistency:WhattoLookForInorderofRedundantresponsibilitiesacrossDisjointresponsibilitieswithinClasswithoneClasswithnoBetterdistributionofClassthatinteractswithmanyotherUse- ysisSupplementtheUse-CaseForeachUse-CaseFindClassesfromUse-CaseDistributeUse-CaseBehaviortoForeach ysisDescribeDescribeAttributesand ysis ysisReview:WhatIsanFindingInformationretainedbyidentified“Nouns”thatdid eInformationwhosevalueistheimportantInformationthatisuniquely"owned”byanInformationthathasnoReview:WhatIsanThesemanticrelationshipbetweentwoormoreclassifiersthatspecifiesconnectionsamongtheirinstances–Astructuralrelationship,specifyingthatobjectsofonethingareconnectedtoobjectsofanotherFindingReview:WhatIsAspecialformofassociationthatmodelswhole-partrelationshipbetweenanaggregate(thewhole)anditspartsAssociationorUse- ysisSupplementtheUse-CaseForeachUse-CaseFindClassesfromUse-CaseDistributeUse-CaseBehaviortoForeach ysisDescribeDescribeAttributesand ysis ysis第八章用例主要内Review:WhyUse ysismechanismsareusedduringysistoreducethecomplexityofysis,andtoimproveitsconsistencybyprovidingdesignerswithashorthandrepresentationforcomplexbehavior. ysisCollectall ysismechanismsinalistDrawamapoftheclientclassestothe IdentifycharacteristicsoftheysismechanismsExample:Describing ysisclass ysismechanismExample:Describing Mechanisms(cont.)ysismechanismPersistencyforScheduleGranularity:1to10KbytesperVolume:upto2,000Access•Create:500per•Read:2,000accessper•Update:1,000perDelete:50perOtherUse- ysisSupplementtheUse-CaseForeachUse-CaseFindClassesfromUse-CaseDistributeUse-CaseBehaviortoForeach ysisDescribeDescribeAttributesand ysis ysis第八章用例主要内 ysisEvaluateYourUse- ysisSupplementtheUse-CaseForeachUse-CaseFindClassesfromUse-CaseDistributeUse-CaseBehaviortoForeach ysisDescribeDescribeAttributesand ysis ysis第八章用例主要内 ysisAretheclassesDoesthenameofeachclassclearlyreflecttheroleitplays?Doestheclassrepresentasinglewell-definedAreallattributesandresponsibilitiesfunctionallyDoestheclassoffertherequiredAreallspecificrequirementsontheclassHaveallthemainand/orsub-flowsbeenhandled,includingexceptionalcases?HavealltherequiredobjectsbeenHasallbehaviorbeenunambiguouslydistributedtotheparticipatingobjects?HasbehaviorbeendistributedtotherightWherether