“Cloning Considered Harmful” Considered Harmful“认为有害地克隆”被认为是有害地.pdf

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1、“CloningConsideredHarmful”ConsideredHarmfulCoryKapserandMichaelW.GodfreySoftwareArchitectureGroup(SWAG)DavidR.CheritonSchoolofComputerScience,UniversityofWaterloo{cjkapser,migod}@uwaterloo.caAbstractclonesposeadditionalproblemsiftheydonotevolvesynchronously.Withthisinm

2、ind,methodsforautomaticCurrentliteratureonthetopicofduplicated(cloned)refactoringhavebeensuggested[4,7],andtoolsspecificallycodeinsoftwaresystemsoftenconsidersduplicationtoaiddevelopersinthemanualrefactoringofcloneshaveharmfultothesystemqualityandthereasonscommonlyalsob

3、eendeveloped[19].citedforduplicatingcodeoftenhaveanegativeThereisnodoubtthatcodecloningisoftenanindicationconnotation.Whilethesepositionsaresometimesofsloppydesignandinsuchcasesshouldbeconsideredtocorrect,duringourcasestudieswehavefoundthatthisisbeakindofdevelopmentbad

4、smell.However,wehavenotuniversallytrue,andwehavefoundseveralsituationsfoundthattherearemanyinstanceswherethisissimplynotwherecodeduplicationseemstobeareasonableorthecase.Forexample,cloningmaybeusedtointroduceevenbeneficialdesignoption.Forexample,amethodofexperimentalopt

5、imizationstocoresubsystemswithoutintroducingexperimentalchangestocoresubsystemsistonegativelyeffectingthestabilityofthemaincode.Thus,duplicatethesubsystemandintroducechangesthereinaavarietyofconcernssuchasstability,codeownership,andkindofsandboxtestbed.Asfeaturesmature

6、andbecomedesignclarityneedtobeconsideredbeforeanyrefactoringstablewithintheexperimentalsubsystem,theycanthenisattempted;amanagershouldtrytounderstandthereasonbeintroducedgraduallyintothestablecodebase.Inthisbehindtheduplicationbeforedecidingwhataction(ifany)wayriskofin

7、troducinginstabilitiesinthestableversionistotake.1minimized.ThispaperdescribesseveralpatternsofcloningThispaperintroduceseightcloningpatternsthatwehavethatwehaveencounteredinourcasestudiesanddiscussesuncoveredduringcasestudiesonlargesoftwaresystems,theadvantagesanddisa

8、dvantagesassociatedwithusingsomeofwhichwereportedin[23,24,25].Thesethem.patternspresentbothgoodandbadmotivationsforcl