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1、Applet-BasedDistributedComputingontheWebJamesF.Carlson,DavidV.Esposito,NathanielJ.Springer,DavidFinkelandCraigE.WillsDepartmentofComputerScience,WorcesterPolytechnicInstitute,Worcester,MA01609USATelephone:+1(508)831-5416Fax:+1(508)831-5776E-Mail:{dfinkel
2、cew}@cs.wpi.eduAbstractWedes
3、cribeaclient-serverframeworkthatallowschunksoflargecomputationstobedistributedamongmanycomputersontheInternet.WedescribeaframeworkofJavaclassesandInternetserversthatallowauserontheWebtoparticipateinthedistributedcomputation.Theexecutedchunkscanbeeitherbestrictlycomputationalormayinv
4、olveexplorationoftheWebitself.Thesystemisdesignedsothatevennon-technicaluserscanparticipate.Keywords:DistributedComputing,JavaApplet1.IntroductionSeveraldifferentparadigmshavebeenproposedfordistributedcomputingontheWeb.OurparadigmisbasedonadistributableJavaclassandaJavahelperappletd
5、ownloadedbyaWebuser[3].Theappletthendownloadsandexecutesthedistributableclass.Thisworkbuildsonourownpreviouswork,describedin[5],inwhichtheHelperprogramwaswrittenasaJavaapplicationinsteadofanapplet.Theuseofanappletinournewworkallowsprogrammerstobuilddistributedapplicationsthatcanbebr
6、okenintosmallsections,orchunks,andconceivablyexecutedbyanyuserontheInternetthroughaJava-enabledbrowser.Theworkcreatesaframeworkforanelectronicmarketplacewherecomputationsinneedofsolutioncanbematchedwithotherwiseidlecomputerstodothework.Inaddition,thisworkbeginstoexploreanewtypeofdis
7、tributedcomputationwhere,insteadofbeingstrictlycomputationalinnature,achunkmayinvolveexplorationofapieceoftheWeb.ThistypeofcomputationraisesexcitingpossibilitiesforWebcrawlerapplications,dataminingapplications,anddistributedperformancemonitoringapplications.Thefirstcomponentofoursys
8、temisadistributableclass.WehavedesignedaJavaabstractbaseclass,calledDistributableClass,whichincludesseveralabstractmethods.Inordertoimplementadistributedcomputation,aprogrammermustwritecodeforaJavaclasswhichextendstheclassDistributableClass.Inparticular,theprogrammermustimplementthe
9、abstractmethodsinDi
