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1AresearchonopenCNCsystembasedonarchitecture/componentsoftwarereusetechnologyLiBin*,ZhouYun-fei,TangXiao-qiNationalResearchCenterofNCSystemEngineering&Technology,HuazhongUniversityofScience&Technology,430074WuhanCity,PRChinaReceived12February2003；receivedinrevisedform25October2003；accepted25October2003Availableonline9June2004AbstractByanalyzingthecurrentdevelopmentsituationofopencomputernumericalcontrol(CNC)systemandarchitecture/componentsoftwarereusetechnology,thispaperresearchesonopenCNCsystembasedonthistechnology.Adoptingdomainengineeringmethod,aCNCsystemisalwaysorganizedwithitsdatacommunication,whichplaysaroleofkeylink.Furthermore,fromwhichthereusablearchitectureofanopenCNCsystemisextracted.Alsothearchitectureisinstancedtoreusabledatacommunicationcomponents,whichdiffersfromgeneralarchitecture.Thefacetmodalsorting,expression,storageandretrievalofCNCsystemcomponentsareintroduced.Combinedwithallusefulinformationasabove,theintegrateddevelopmentplatformofopenCNCsystemisconstructed.Supportedbythisplatform,theworkflowofdevelopingopenCNCsystemsincludestwocorrelatedcourses:thedevelopmentofreusableCNCcomponents,andtheconstructionofanapplicationsystemwiththesereusablecomponents.Furthermore,thereal-timecapabilityofaCNCapplicationsystemonMS-Windowscanbetestedbythisplatform.Keywords:CNC；Openarchitecture；Component；Softwarereuse；Domainengineering1.IntroductionOwingtothedouble-quickdevelopmentofhardwaretechnology,theenhancementofcomputernumericalcontrol(CNC)system’scomplexity,theincreaseofthecompatiblerequestswiththirdpartysoftware,thefrequentjob-hoppingofdeveloper,and2thecut-throatcompetitionamongcraftbrothers,theCNCsystemmanufacturersarecompelledtodotheirbesttocontinuallyimprovetheirsystem’squalityandshortentheperiodsoftheproductsdevelopment.Hence,theopenarchitectureisbecomingthecurrenttrendofCNCtechnology,anditsmaingoalistobuildauniformandrecognizablesystemplatform.Developedwiththeopenarchitectureplatform,theCNCapplicationsystemwouldbecomemoremodularandflexible,thususersofthissystemwillbeallowedtochoosefunctionmodules,eventointegrate,modify,andexpandsystematicfunctionsinordertomeetdifferentapplicationdemands.Theup-to-dateopinionsonopenCNCsystemcanbeconcludedasfollows[1–4]:(1)AnopenCNCsystemisflexibleinbothhardwareandsoftware,soitdoesnotonlyallowthehardwaretochangeitsbasicconfiguration,butalsoallowsthesoftwaretoalteratalllevelsofcontrol.(2)AnopenCNCsystemisprovidedwiththeplug-and-playcompatibilityinarealsense.(3)AnopenCNCsystemisstandardizedtoletthethirdpartydevelopnewhardwareandsoftwarethatcanmeetitsrequirements.(4)AnopenCNCsystemhasthecapabilityofintegrationofothercomponentsatthelevelofpartswiththisstandard,andcanalsosharedataamongthecomponents.(5)AnopenCNCsystemcancooperatewithothersystemsatsystematiclevel.Inviewoftheabove-mentionedcauses,wetakeitasnaturalthatestablishinganopenNCsystemmodelforthespecialNCdomainmaybeafeasiblemethod.Ontheotherhand,thesoftwarereuseisindeepdegreeappliedintheprocessofsoftwaredevelopment,especiallyinthesamedomainbecauseanewsystemalwayshasveryintimaterelationwiththepreviousone[5].Itisgraduallyconvincedthatthedesignandspecificationofthewholesystemarchitectureismoreimportantthantheselectionofalgorithmanddatastructureincompanywiththeincreasinglyupgradingofsoftwaresystem’ssizeandcomplexity.Sothesignificanceofsoftwarearchitectureisbeingrecognizedonthebackground.Thearchitecture/componenttechnologyhasbeendevelopingpromptlyamongnumeroussoftwarereusetechnologiesinrecentyears[6,7].Basedontheabove-mentionedviewpointsaboutopenCNCandthesoftwarearchitecture/componentreusetechnology,thearchitectureofopenCNCsystemandtheintegratedplatformofdevelopingCNCsystemareresearchedinthispaper.32.OpenCNCsystembasedonarchitecture/componentsoftwarereusetechnology2.1.Softwarereuseandarchitecture/componenttechnologySoftwarearchitecturemeansthedelineationoftheoverallstructuredesignandtheabstractspecificationofasystem.Itisamacroscopicaldescriptionforsoftwaresystem’scomposition,architecture,andworkmode.Inshort,thesoftwarearchitecturedescribesthecomponentsandtheinnerrelationamongthesecomponentsinasystem.Thesoftwaredevelopmentbasedonarchitecturedivertsitsemphasisfromcodelinestolargergranularityarchitectureelements(forinstance,components),aswellastheholisticinterlinkagestructureamongtheseelements.Thedevelopmentkeynoteistoconstructreusablesoftwarearchitecture；itemphasizesthereusabilityofanalysesanddesigninsteadoftherestrictionofcodereuse.Componentisaunitthatisrelativelyindependentinfunction.Itcanbeidentifiedclearly,andcanbereusedinasoftwaresystem.Itmaybeaclass,aclasstree,aframe,orageneralmodule.Alongwithembeddedcomprehensiontosoftwarereuse,theconceptofcomponentsisnolongerrestrictedtocodecomponents,butextendedtodemand,architecture,document,testplan,testcasesanddata,aswellasotherusefulinformationtodevelopmentactivation.Thesoftwarereusebasedonarchitecture/componenttechnologyincludestwocorrelativeprocesses:Thedevelopmentofreusablecomponentsandthedevelopmentofapplicationsystemwithreusablecomponents.Thefunctionsofthesoftwarearchitecture/componenttechnologyintheprocessofdevelopmentcanbeshownasFig.1.Firstly,specialdomainisanalyzedwithdomainengineeringmethod,andthesoftwarearchitectureofthisspecialdomaincanbegained.Thentheprocessofcomponentdevelopment,sortingandstoragecanbeguidedwiththisarchitecture.Whenanewapplicationsystemneedstobedeveloped,somerelevantcomponentsaresearchedandextractedfromadomaincomponentlibraryand/orothergeneralcomponentlibraries,followingthattheappropriatecomponentswillbeselectedandmodifiedforadaptation,finally,thesecomponentswillbeassembledinanewapplicationsystem.2.2.CNCsystemopennessistherequirementforsoftwarereusetechnologyinaspecialdomain4Thefirstprincipleofopensystemtechnologyistoapplyinterfacestandardsintheprocessofsystemdevelopmentandtousetherealizationaccordingtointerfacestandardsinthemeantime.Thisprovidesastablefoundationforthedesigndecisionofsystemdevelopmentandthesystemevolution,alsotheguaranteeforinteroperationamongsystems(subsystems)atthesametime[8].From1980s,researchprojectsonopenNCsystemhasbeensetoutintheworldoneafteranother,someofwhichhavegreatinfluence,suchasOMACofAmerica,OSACAofEuropeandOSECofJapan.TheOSACArealizeddatacommunicationamongtaskdomainsbythecommunicationsystem,itssystemmodelisbasedonhierarchicalstructure,alldatastructuresofeachfunctionalmoduleoftheapplicationsystemandinternalrunningmechanismbasedonthesedatastructuresofthemodulemustbedefinedthoroughly,anditneedscomplicatedconfiguresystemtoestablishandmaintaintheincompacttopologicalstructureoftheapplicationsystem.Now,thesoftwarereusetechnologycanideallysupporttheopenarchitecturesystem,especiallythecomponentsthatareinaccordwithinterfacestandardscanbeeasilyintegratedtothesystemin‘‘plugandplay’’method,whichisablackboxreuse.Inthisway,componentscanbedevelopedindependentlyaccordingtointerfacestandards.

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