《计算机专业英语》课件第28章.ppt

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《计算机专业英语》课件第28章.ppt

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bilateraladj.两边的,双边的,有两边的,在两边的maturevt.vi.使成熟,成熟corelanguages核心语言foundationclasses基础类domainspecificdata域特定元素cost-to-use成本ACA(AdaptiveComponentArchitecture)自适应组件体系结构veilvt.以面纱遮掩,隐蔽UNIT28Component-BasedDevelopment—ARevolutioninApplicationDevelopmentComponent-BasedDevelopment(CBD)willrevolutionizethesoftwareindustry.1Unlikerecenttrendssuchasobjectsandclient/server,itisnotjustanotherflavorofdistributedcomputing,butanextensiblearchitecturetosupportalllifecyclecomputingmetaphor,includingdesign,developmentanddeployment.Becauseofitshighlevelsofreuseandinteroperability,CBDwillinfluenceeverydimensionofapplicationcomposition,includingalltypesofclients,applicationserversanddatabasesevers,andwillhaveaprofoundimpactonallaspectsofapplicationdevelopment.CBD’spredecessorwasobjectoriented(OO)development.Objectsweretheindustry’sfirststabatdeliveringhighlevelsofreuse.2ButtheunsophisticatednatureofOOdevelopmentenvironmentsandthelackofacommoninfrastructureforaddressingobjectinteroperabilityhinderedtheirmainstreamadoption.3OOdevelopmentwastoofaraheadofitstimeandlackedinfrastruturalsupportfromthesoftwareindustry.CBDredefinesobjectsinthecontextofastandardizedinfrastructureforinteroperabilityframeworksfortheconstructionandassemblyofapplications,andprebuiltcomponentsthatsubscribetocomponentinfrastructuresandframeworks.TheinfrastructuraldimensionofthecomponentarchitectureisthecatalysttoachievingthereuseandinteroperabilitythatunderminedOOdevelopment.4Thisinfrastructure,alongwiththeavailabilityCBDframeworksthatenablecomponentdesign,constructionandassembly(ratherthanjustbeinganenvironmentfo