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1、AWorld-WideDistributedSystemUsingJavaandtheInternetK.ManiChandy,AdamRifkin,PaoloA.G.Sivilotti,JacobMandelson,MatthewRichardson,WesleyTanaka,andLukeWeismanComputerScienceDepartment256-80CaliforniaInstituteofTechnologyPasadena,California91125fadam,mani,paolog@cs.caltech.eduht
2、tp://www.cs.caltech.edu/adam/CALTECH/infospheres.htmlAbstracttionsontheWeb.ThispaperdescribesaprojecttousetheWebasadistributedsystemwithpeer-to-peerpro-cesscommunicationacrosstheGlobalInformationIn-Thispaperdescribesthedesignofadistributedsys-frastructure(GII).Thefocusofour
3、projectisoniden-tembuiltusingJavathatsupportspeer-to-peercommu-tifyingandspecifyingsoftwarecomponentsthatcannicationamongprocessesspreadacrossanetwork.Webecomposedtocreatedistributedapplications,im-identifytherequirementsofasoftwarelayerthatsup-plementingthesoftwarecomponent
4、sasclassesinanportsdistributedcomputing,andweproposeadesignobject-orientedframework,developingacompositionalthatmeetsthoserequirements.Ourprimaryconcernsmethodologyforconstructingcorrectdistributedap-are(1)theidenti cation,speci cation,andimplemen-plicationsfromthecomponents
5、,andimplementingatationofsoftwarecomponentsthatcanbecomposedlibraryofapplicationsthatdemonstratesthemethod-indi erentwaystodevelopcorrectdistributedappli-ology.cations;(2)reasoningaboutthecomponentssystemat-ically;and(3)providingservicestothecomponents.Ourprojectdevelopsmeth
6、odsandtoolsfordis-Thispaperdealswiththelastoftheseconcerns.tributedprogrammingapplicationslayeredontopofstandardnetworktechnologies.Thoughourimplemen-ThoughourimplementationusesJava,thefunda-tationusesJava,wecouldhaveusedanyotherobject-mentalideasapplytoanyobject-orientedlan
7、guagethatorientedlanguagethatsupportsthreadsandcommu-supportsmessagingandthreads.Alternativeimple-nicationclasses.mentationsusesuchlanguagescoupledwithobjectre-questbrokersorremoteprocedureinvocationmecha-nisms.Correctness.Ourprojectdealswithprovidingsoft-Keywords:Distribute
8、dsystems,collaborativewarecomponentsandcompositionalmethodsthatsup-environm
