华东交大软件体系结构

1、maintainCasesforExampleATMSystemcustomerbanksession.,厂invalidPINtransactionwithdrawalinquirydeposittransferSystemStartupUseCaseThesystemisstartedupwhentheoperatorturnstheoperatorswitchtotheonposition.Theoperatorwillbeaskedtoentertheamountofmoneycurrentlyinthecashdispenser,andaconnectiontothebankwill

2、beestablished.Thentheservicingofcustomerscanbegin.InteractionDiagramSystemShutdownUseCaseThesystemisshutdownwhentheoperatormakessurethatnocustomerisusingthemachine,andthenturnstheoperatorswitchtotheoffposition.Theconnectiontothebankwillbeshutdown.Thentheoperatorisfreetoremovedepositedenvelopes,reple

3、nishcashandpaper,etc.InteractionDiagramSessionUseCaseAsessionisstartedwhenacustomerinsertsanATMcardintothecardreaderslotofthemachine.TheATMpullsthecardintothemachineandreadsit.(Ifthereadercannotreadthecardduetoimproperinsertionoradamagedstripe,thecardisejected,anerrorscreenisdisplayed,andthesessioni

4、saborted.)Thecustomerisaskedtoenterhis/herPIN,andisthenallowedtoperformoneormoretransactions,choosingfromamenuofpossibletypesoftransactionineachcase.Aftereachtransaction,thecustomerisaskedwhetherhe/shewouldliketoperformanother.Whenthecustomeristhroughperformingtransactions,thecardisejectedfromthemac

5、hineandthesessionends.IfatransactionisabortedduetotoomanyinvalidPINentries,thesessionisalsoaborted,withthecardbeingretainedinthemachine.ThecustomermayabortthesessionbypressingtheCancelkeywhenenteringaPINorchoosingatransactiontype.InteractionDiagramTransactionUseCaseNote:Transactionisanabstractgenera

6、lization.Eachspecificconcretetypeoftransactionimplementscertainoperationsintheappropriateway.Theflowofeventsgivenheredescribesthebehaviorcommontoalltypesoftransaction.Theflowsofeventsfortheindividualtypesoftransaction(withdrawal,deposit,transfer,inquiry)givethefeaturesthatarespecifictothattypeoftran

7、saction.Atransactionusecaseisstartedwithinasessionwhenthecustomerchoosesatransactiontypefromamenuofoptions.Thecustomerwillbeaskedtofurnishappropriatedetails(e.g.account(s)involved,amount).Thetransactionwillthenbesenttothebank,alongwithinformationfromthecustomerscardandthePINthecustomerentered.Iftheb

8、ankapprovesthetransaction,anystepsneededtocompletethetransaction(e.g.dispensingcashoracceptinganenvelope)willbeperformed,andthenareceiptwillbeprinted.Thenthecustomerwillbeaskedwhetherhe/shewishestodoanothertransaction.IfthebankreportsthatthecustomersPINisinvalid,theInvalidPINextensionwillbeperformed

9、andthenanattemptwillbemadetocontinuethetransaction.IfthecustomerscardisretainedduetotoomanyinvalidPINs,thetransactionwillbeaborted,andthecustomerwillnotbeofferedtheoptionofdoinganother.Ifatransactioniscancelledbythecustomer,orfailsforanyreasonotherthanrepeatedentriesofaninvalidPIN,ascreenwillbedispl

10、ayedinformingthecustomerofthereasonforthefailureofthetransaction,andthenthecustomerwillbeofferedtheopportunitytodoanother.ThecustomermaycancelatransactionbypressingtheCancelkeyasdescribedforeachindividualtypeoftransactionbelow.AllmessagestothebankandresponsesbackarerecordedintheATMslog.InteractionDi

11、agramWithdrawalTransactionUseCaseAwithdrawaltransactionasksthecustomertochooseatypeofaccounttowithdrawfrom(e.g.checking)fromamenuofpossibleaccounts,andtochooseadollaramountfromamenuofpossibleamounts.Thesystemverifiesthatithassufficientmoneyonhandtosatisfytherequestbeforesendingthetransactiontotheban

12、k.(Ifnot,thecustomerisinformedandaskedtoenteradifferentamount.)Ifthetransactionisapprovedbythebank,theappropriateamountofcashisdispensedbythemachinebeforeitissuesareceipt.(ThedispensingofcashisalsorecordedintheATMslog.)AwithdrawaltransactioncanbecancelledbythecustomerpressingtheCancelkeyanytimeprior

13、tochoosingthedollaramount.InteractionDiagramDepositTransactionUseCaseAdeposittransactionasksthecustomertochooseatypeofaccounttodepositto(e.g.checking)fromamenuofpossibleaccounts,andtotypeinadollaramountonthekeyboard.ThetransactionisinitiallysenttothebanktoverifythattheATMcanacceptadepositfromthiscus

14、tomertothisaccount.Ifthetransactionisapproved,themachineacceptsanenvelopefromthecustomercontainingcashand/orchecksbeforeitissuesareceipt.Oncetheenvelopehasbeenreceived,asecondmessageissenttothebank,toconfirmthatthebankcancreditthecustomersaccount-contingentonmanualverificationofthedepositenvelopecon

15、tentsbyanoperatorlater.(ThereceiptofanenvelopeisalsorecordedintheATMslog.)AdeposittransactioncanbecancelledbythecustomerpressingtheCancelkeyanytimepriortoinsertingtheenvelopecontainingthedeposit.Thetransactionisautomaticallycancelledifthecustomerfailstoinserttheenvelopecontainingthedepositwithinarea

16、sonableperiodoftimeafterbeingaskedtodoso.InteractionDiagramTransferTransactionUseCaseAtransfertransactionasksthecustomertochooseatypeofaccounttotransferfrom(e.g.checking)fromamenuofpossibleaccounts,tochooseadifferentaccounttotransferto,andtotypeinadollaramountonthekeyboard.Nofurtheractionisrequiredo

17、ncethetransactionisapprovedbythebankbeforeprintingthereceipt.AtransfertransactioncanbecancelledbythecustomerpressingtheCancelkeyanytimepriortoenteringadollaramount.InteractionDiagramInquiryTransactionUseCaseAninquirytransactionasksthecustomertochooseatypeofaccounttoinquireaboutfromamenuofpossibleacc

18、ounts.Nofurtheractionisrequiredoncethetransactionisapprovedbythebankbeforeprintingthereceipt.AninquirytransactioncanbecancelledbythecustomerpressingtheCancelkeyanytimepriortochoosingtheaccounttoinquireabout.InteractionDiagramInvalidPINExtensionAninvalidPINextensionisstartedfromwithinatransactionwhen

19、thebankreportsthatthecustomerstransactionisdisapprovedduetoaninvalidPIN.Thecustomerisrequiredtore-enterthePINandtheoriginalrequestissenttothebankagain.Ifthebanknowapprovesthetransaction,ordisapprovesitforsomeotherreason,theoriginalusecaseiscontinued;otherwisetheprocessofre-enteringthePINisrepeated.O

20、ncethePINissuccessfullyre-entered,itisusedforboththecurrenttransactionandallsubsequenttransactionsinthesession.IfthecustomerfailsthreetimestoenterthecorrectPIN,thecardispermanentlyretained,ascreenisdisplayedinformingthecustomerofthisandsuggestinghe/shecontactthebank,andtheentirecustomersessionisabor

21、ted.IfthecustomerpressesCancelinsteadofre-enteringaPIN,theoriginaltransactioniscancelled.ThisisanexampleofUMLbehavioralstatemachinediagramshowingBankAutomatedTellerMachine(ATM)toplevelstatemachine.ATMisinitiallyturnedoff.Afterthepoweristurnedon,ATMperformsstartupactionandentersSelfTeststate.Ifthetes

22、tfails,ATMgoesintoOutofServicestate,otherwisethereistriggerlesstransitiontotheIdlestate.InthisstateATMwaitsforcustomerinteraction.TheATMstatechangesfromIdletoServingCustomerwhenthecustomerinsertsbankingorcreditcardintheATMscardreader.OnenteringtheServingCustomerstate,theentryactionreadCardisperforme

23、d.Note,thattransitionfromServingCustomerstatebacktotheIdlestatecouldbetriggeredbycanceleventasthecustomercouldcanceltransactionatanytime.ATransactionlumofffshutDownturnon/startupfailureSelfTestfailureServingCusiom-erSelectingTransactionturnoff/shutDownOutofServiceentry/readCardexit/ejectCard乜mm弗hiri

24、EB且nkAT号丿eUaMaintenanceJCustcmerAuthentication0-0AcancelcardInsertedV八failureBehavioralstatemachineexample-BankATMServingCustomerstateisacompositestatewithsequentialsubstatesCustomerAuthentication,SelectingTransactionandTransaction.CustomerAuthenticationandTransactionarecompositestatesbythemselveswhichisshownwithhiddendecomposition