华东交大软件体系结构作业

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1、Question#1:Explaintheconceptofcohesionandcouplinginsoftwarearchitectureanddesign.Pleaseexplainitwithexamplesanddiagrams.CohesioncouplingConceptCohesionfromafunctionalpointofviewtomeasurethecontactmodule,whichdescribesthefunctionwithinthemodulelinks.Thecouplingisbetweenthevariousmodu

2、lesofthesoftwarestructureofmutuallyconnectedameasure,thecouplingstrengthdependsonthecomplexityoftheinterfacebetweenmodules,into,ortoaccessamodulepointandthedatathroughtheinterface.Classification(1)accidentalcohesion.(2)logicalcohesion.(3)withinthepoly(4)withinaprocesspolyethylene(5)

3、communicationpoly(6)inorderwithinthepoly(7)Functioncohesive(1)contentcoupled(2)commoncoupling(3)Theexternalcoupling(4)ControlCoupling(5)markercoupling(6)Datacoupling(7)Anon-directcouplingQuestion#2:Whicharchitecturestyleisbestsuitedfordistributedsoftwaresystem?Explainitwithexamplesa

4、nddiagramsContrastmainstreamB/SandC/Ssystem,thattheB/SismoresuitablefordistributedsystemsB/SC/SDatasecurityB/Sstructureofthesoftwarebecauseofitsdataisstoredcentrallyattheheadquartersofthedatabaseserver,theclientdoesnotsaveanybusinessdataanddatabaseconnectioninformation,withoutthenee

5、dforanydatasynchronization,sothesesecurityproblemswillnotexistnaturallyC/Sstructuresoftwaremustbeinstalledinvariousmultipleservers,anddatasynchronizationbetweenmultipleservers,eachdatapoint,thedatasecurityaffectstheentireapplicationdatasecurity,intermsofthelarge-scaleapplicationofth

6、eGroupclassC/Sstructuresoftware'ssecurityisunacceptable.B/SC/SDataconsistencyThedataisstoredcentrally,theclienteverybusinessdocumentsdirectlyintothecentraldatabase,thereisnodataconsistencyproblemsServermustbesynchronizeddailyaftertheheadquartersbeforeyoucangetthefinaldata,thenumbero

7、fdatacanneverbethesame,cannotbeusedindecision-makingReal-timedataB/Sstructureinrealtimetoseeallthishappenedbusinesstofacilitaterapiddecision-makingtoavoidbusinesslosses.C/Sstructureimpossibleanywheretoseetheoccurrenceofthecurrentbusinesssituation,seeareafterthedataDatatraceabilityB/

8、Sstructureofthedata