用面向圖的方法實現(xiàn)CORBA分布式應用的動態(tài)配置.pdf

1、上海大學碩士學位論文用面向圖的方法實現(xiàn)CBA分布式應用的動態(tài)配置姓名：宋毅申請學位級別：碩士專業(yè)：計算機應用指導教師：劉云超曹旻20040101上姆大學碩十學位論文——!生!堅曼型堅坐墮坐垡璺!塑量鯉竺呈墜!墅壁AbstractMostdistributedsoftwaresystemshavetOundergoseveralmodificationsduringtheirlifetimeinordertoadaptforthechan

2、geofnewrequirementsnewtechnology，andnewenvironmentsForeconomicalorsafetyreasonssomesystemscannotbestoppedortakenofflinetoperformthosechanges：theyhavetObedynamicallyreconfiguredEvenifitisallowedtostoptheapplicationforupgr

3、adingormodifcation，itiSmoreadvantageoustoreconfigureitatruntimebecauseunchangedsectionscarlcontinuetoprovidepartialserviceOwingtotherequirementsofonlinemodification，dynamicreconfigurationofdistributedsysternshasgotmorean

4、dmoreattentionButwiththedevelopmentofmiddle—waretechnologythoseexistingreconfgurationmodelshaveinsu舔cientsupportfordynamicreconfigurationofdistributedsystemsbasedonmiddlewareAtiermakingthoroughresearchesonvarioustypicalr

5、etortfigurationmethods，thispaperpresentsanewmodel，OrbGOP，tosupportthearchitectinganddynamicreconfigurationofCORBAbaseddistributedapplications0rbGOPmakesthreeCOntributionstothedevelopmentofCOl強A—basedapplications：(1)itpro

6、videshigher1evelabstractionsforprogrammingC0妯Abasedapplicationsandfreestheprogrammerfromtheunderlyingirrelevantdetails；(2)itfacilitatesthearchitecturedescriptionanddynamicreconfigurationofCORBAbasedapplications(3)itpartl

7、ysupportsfaulttoleranceinC0砒jAbaseddistributedsoftwarethrou吐dynamicreconfigurationupondetectionoffaults0rbGOPiSbasedontheGraph—OrientedProgramming(GOP)modelwheretheconfigurationofadistributedprogramisdescribedasalogicalg

8、raphseparatedfromtheprogrammingoftheconstituentcomponentsoftheprogramComponentinteractionsanddynamicreconfigurationareimplementedbyexecutingasetofoperationsthataredefinedoverthegraphOrbGOPextendstheapplicationofGOPtotheC

9、ORBAenvironmentandprovidesmorepowerfulsupportforcomponentbaseddistributedsoftwarearchitectureThisthesisdiscussesthereconfigurationideaofOrbGOPtheoreticallyandimplementsaprototypeofitwithJavaontopofCORBA，onwhichsomeexampl

10、eshaverunThroughtheseexamples，wevalidatethefeasibilityofOrbGOPandshowhowOrbGOPprovidesaconvenient，architecturalapproachforhighlevelprogramminganddynamicreconfigurationsupportforthedevelopmentofCORBAbaseddistributedapplic

11、ationsThesystemarchitecture，thedetailsoffunctionalmodulesandlibrarydesignarealsodiscussedFinallywemakepreliminaryperformanceevaluationoftheworkingprototypeofOrbGOPKeywords：Middleware，CORBA，Distributedsoftware，Dynamicreco