UML教材2Car Case Design.docx

UML教材2Car Case Design.docx

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UML教材2CarCaseDesign

APACHERENTACARCASE–DESIGN

ThissectioncontainsthedesignmodelsfortheApacheRentACarcase.Themodelsappearinchaptersequence.

ApacheRentACar–Chapter7

Introduction

Thischapterdiscussesthedesignoftheoverallsystemstructure.Thequestionsillustratehowto:

1.AllocateEssentialUseCasestoProcessors

2.AllocateStoredDatatoStorageDevices

Notethatthesestepsarenotpartofthesevenstepsforprogramdesign.

ApacheRentACarAssignments–Chapter7

1.DefinethreealternativesystemstructuresfortheApacheRentACarsystem.（SeeFigures7.13,7.14,and7.15fortheuniversityregistrationsystem.）

Alternative“A”allocatestheusecasestotwoprocessors.

Alternative“B”allocatestheusecasestoasingleprocessor,butaddsasecondprocessorforthedatastorage.

Alternative“C”sameasAlternative“A”butalsoallocatesthedatastoragetoaseparateprocessor.

2.Discussqualitativelytheadvantagesanddisadvantagesofeachalternative.

a.Alternative“A”allocatestheusecasestwoprocessors

∙Advantage:

Thiskeepsthecarmaintenancesystemusedbyemployeesseparatefromthereservationandrentalsystemusedbythecustomers.

∙Disadvantage:

Thetwoprocessorswillhavetocommunicatefrequentlywitheachother.

b.Alternative“B”allocatestheusecasestosameprocessor,butaddsasecondprocessorforthedatastorage.

∙Advantage:

Thiswillensurethatthedataissecure.Itwillbeeasiertobackupandmaintainaswell.

∙Disadvantage:

Thetwoprocessorswillhavetocommunicatefrequentlywitheachother.

c.Alternative“C”sameasAlternative“A”butallocatesalldatastoragetoaseparatestorageprocessor.

∙Advantage:

Thisallowstheprocessorstobesinglefunctionandthuscanbeoptimized.Italsomakesiteasytobackupthedatastorage,asitisseparate.

∙Disadvantage:

Thethreeprocessorswillhavetocommunicatefrequentlywitheachother.

ApacheRentACar–Chapter8

Introduction

Thischapterdiscussesthefirststepoftheseven-stepprocessforobject-orientedprogramdesign.Thisstepis:

Step1.Produceaninteractiondiagramforeachsystemoperationidentifiedduringanalysis

ApacheRentACarAssignments–Chapter8

ApacheRentACarInteractionDiagram

Thetextbookshowsalltheintermediatestepsnecessarytoobtainacollaborationdiagram.Attheendofthechapter,theyareconvertedtoasequencediagram.Oncetheindividualeventshavebeenconvertedtoacollaborationdiagram,itiscommontoconvertthemtoasequencediagram.Manypeoplefeelitiseasiertoreadsequencediagramsbecauseoftheirsequentialnature.Theanswerstothesequestionsarepresentedinthisformat.Alsoallsystemoperationsforeachusecasearegroupedtogetherinasinglesequencediagraminthesystem.

Developaseparatesetofinteractiondiagrams（eithercollaborationorsequencediagrams）foreachoftheusecasesintheRentACarsystem.

BesurethattheinteractiondiagramforeachusecasedemonstrateshowyouverifythepreconditionsandsatisfythepostconditionsforeachofthesystemoperationcontractspreparedfortheChapter5assignments.Showanexplicitcreateoperationforeachnewobject.Alsoshowanexplicitassociateoperationforeachnewlyestablishedlink.Alsobesurethateachobjectknowsalltheargumentsforanymessagethatitsends.

Suggestion:

SketchtheinteractiondiagramsfollowingthemethoddescribedinChapter8beforeyouuseanysoftwaretooltopreparethediagrams.

ApacheRentACar–Chapter9

Introduction

Thischapterdiscussessteps2and3oftheseven-stepprocessforobject-orientedprogramdesign.Thesestepsare:

Step2.Produceadesignclassdiagramshowingtheoperationsfromtheinteractiondiagrams.

Step3.Specifythesignatureandthealgorithmforeachoperation.

ApacheRentACarAssignments–Chapter9

ApacheRentACarClassDiagram

Chapter9showsthedevelopmentoftheclassdiagramwithaspecialemphasisonqualifiedassociations.

1.DevelopadesignclassdiagramfortheApacheRentACarsystem.

Payparticularattentiontoappropriateuseoftheaggregationandcompositionsymbols,whichareusedwhenanassociationbetweenclassesrelatespartstowholes,memberstogroups,orcontentstocontainers.Showclasshierarchies.Alsobesuretoindicateonthediagramnavigabilityfromoneclasstoanother.

2.ReviseandrefinetheinteractiondiagramsdevelopedfortheChapter8assignment.CorrectanyviolationsoftheLawofDemeter,reducethecoupling,andincreasethecohesion.Modifythedesignclassdiagramtobeconsistentwiththeseimprovements.

Wetookgreatcaretobesurenoneoftheseviolationswerepresentedearlier.Moststudentsunderstandcouplingandcohesion.TheLawofDemeterisprobablythemostdifficultonetoavoid.NotethatoperationslikemakeReturn,makeDriver,makeExtraCharge,andmakePaymentoccurinCarandRental.Thisispreferabletohavingthefaçadeobjectinvokeagetoperationineachoftheaboveclassestoobtaintherentalobjectandthensendamessagetoit.Thishabitiscommonamongbeginners,especiallyinprogrammingclasses.

ApacheRentACarSignatures

Althoughnotaskedfor,signaturesforalloperationswillbeprovided.Thismakesitpossiblefortheinstructortoeasilyaddanassignmenttodevelopthem.

3.Developsignaturesforalloperations.Youmayomitthe“creates”becausetheyareofastandardformat.（optionalquestion）

ThisanswerisprovidedwithsignaturesinaUMLformatasinFigure9.22.ThedatatypesarecompatiblewithJava.

CompleteSpecificationofAttributesandOperations–ApacheRentACar

Car

Attributes

-color:

String

-licenseNumber:

String

-make:

String

-model:

String

-modelYear:

int

Operations

+associateExtraChargeSpecification

（extraChargeSpecification,ExtraChargeSpecification）

+associateRental（rental:

Rental）

+associateInspection（inspection:

Inspection）

+associateThirdPartyPayer（thirdPartyPayer,ThirdPartyPayer）

+authorize（amount:

double,merchantNumber:

int）:

boolean

+makeCreditCard（creditCardNumber:

String,

expirationMonth:

int,expirationYear:

int）

+makeDriver（name:

String,birthDate:

Date,

driversLicenseNumber:

String,stateOfIssue:

String）

+makeExtraCharge（amountCharged:

double）

+makeInspection（damage:

double,gasLevel:

double,mileageIn:

int,

time:

Date）

+makePayment（amount:

double）

+makeRental（timeOut:

Date,mileageOut:

int）

+makeReturn（timeIn:

Date）

CreditCard

Attributes

-creditCardNumber:

String

-expirationMonth:

int

-expirationYear:

int

Operations

+authorize（amount:

double,merchantNumber:

int）:

int

Customer

Attributes

-address:

String

-name:

String

-phoneNumber:

String

Operations

None

CompleteSpecificationofAttributesandOperations–ApacheRentACar（Continued）

Driver

Attributes

-birthDate:

Date

-driversLicenseNumber:

String

-name:

String

-stateOfIssue:

String

Operations

None

ExtraCharge

Attributes

-amountCharged:

double

Operations

+associateExtraChargeSpecification

（extraChargeSpecification,ExtraChargeSpecification）

ExtraChargeSpecification

Attributes

-extraChargeCode:

String

-description:

String

-price:

double

Operations

None

Inspection

Attributes

-damage:

double

-gasLevel:

double

-mileageIn:

int

-time:

Date

Operations

None

Payment

Attributes

-amount:

double

-authorizationNumber:

int

-date:

Date

Operations

+associateCreditCard（creditCard:

CreditCard）

+authorize（amount:

double,

merchantNumber:

int）:

boolean

+makeCreditCard（creditCardNumber:

String,

expirationMonth:

int,expirationYear:

int）

RentalSystem

Attributes

None

Operations

+assignCar（）

+enterCarRequest（carType:

String,pickUpDate:

Date,

returnDate:

Date）

+enterConfirmation（confirmationNumber:

int,timeOut:

Date）

+enterCreditCard（creditCardNumber:

String,

expirationMonth:

int,expirationYear:

int）

+enterCustomer（phoneNumber:

String,name:

String,address:

String）

+enterDriver（name:

String,birthDate:

Date,

driversLicenseNumber:

String,stateOfIssue:

String）

+enterExtraCharge（extraChargeCode:

String,amountCharged:

double）

+enterInspection（licenseNumber:

String,damage:

double,

gasLevel:

double,mileageIn:

int）

+enterMileageOut（mileageOut:

int）

+enterReturn（licenseNumber:

String,timeIn:

Date）

+enterThirdPartyCustomer（accountNumber:

int）

+enterPayment（licenseNumber:

String,amount:

double）

+verifyCarLicense（licenseNumber:

String）:

boolean

+verifyConfirmationNumber（confirmationNumber:

int）:

boolean

+verifyExtraChargeCode（extraChargeCode:

String）:

boolean

+verifyRateCode（carType:

String）:

boolean

+verifyThirdPartyCustomer（accountNumber:

int）:

boolean

CompleteSpecificationofAttributesandOperations–ApacheRentACar（Continued）

RateClass

Attributes

-carType:

String

-dailyRate:

double

-mileageRate:

double

-numberOfFreeMiles:

int

-weekEndRate:

double

-weeklyRate:

double

Operations

None

Rental

Attributes

-agreementNumber:

int

-mileageOut:

int

-timeOut:

Date

Operations

+associateDriver（checkOut:

CheckOut）

+associateExtraCharge（extraCharge,ExtraCharge）

+associateExtraChargeSpecification

（extraChargeSpecification,ExtraChargeSpecification）

+associateInspection（inspection,Inspection）

+associatePayment（payment,Payment）

+associateReservation（reservation,Reservation）

+associateReturn（return,Return）

+associateThirdPartyPayer

（thirdPartyCustomer,ThirdPartyCustomer）

+authorize（amount:

double,merchantNumber:

int）:

boolean

+makeCreditCard（creditCardNumber:

String,

expirationMonth:

int,expiration