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基于发布订阅的异构松耦合RIA技术数据交换平台的研究和应用.docx

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基于发布订阅的异构松耦合RIA技术数据交换平台的研究和应用 Abstract Withtheincreasingdemandforreal-timedataexchangeinRichInternetApplication(RIA)technology,aheterogeneous,looselycoupleddataexchangeplatformbasedonpublish-subscribemechanismhasemerged.Thispaperfocusesontheresearchandapplicationofsuchaplatform,discussingitsarchitecture,advantages,andimplementationstrategies. Introduction RIAtechnologyiswidelyusedininformationsystemsduetoitsuser-friendlinessandrichuserexperience.However,oneofthechallengesofRIAdevelopmentistheefficientexchangeofdatabetweendifferentapplicationcomponentsanddifferentsystemsdistributedacrossthenetwork.Thetraditionalrequest/responsemechanismsuffersfromlimitationssuchaslatencyanddatainconsistency.Hence,apublish-subscribe(pub-sub)modelisgainingpopularityasapreferredalternativefordataexchangeinRIAsystems.Inthismodel,publishersproduceanddistributemessages,andsubscribersreceiveandactuponthem. Thispaperpresentsaresearchstudyonaheterogeneous,loosely-coupleddataexchangeplatformbasedonthepub-submechanism.TheplatformhasbeendesignedtoaddressthedataexchangechallengesfacedbyRIAsystems.Thearchitectureoftheplatformisdiscussedindetail,followedbytheadvantagesofusingthepub-submodelinsuchasystem.Finally,theimplementationstrategiesfortheplatformarepresented. PlatformArchitecture Theproposedplatformisbasedonathree-layerarchitecturecomprisingofthepresentationlayer,messagelayer,andstoragelayerasshowninFigure1.Thelayersaredefinedasfollows: 1.Presentationlayer-Thislayerisresponsiblefortheuserinterface(UI)andinteractionswiththeuser.Itcomprisesofwebpages,widgets,andotherUIelements.Thepresentationlayergeneratesmessagestobepublishedinthemessagelayer. 2.Messagelayer-Thislayeractsastheintermediarybetweenthepublishersandsubscribers.Itreceivesmessagesproducedbypublishersinthepresentationlayeranddeliversthemtothesubscribersinthestoragelayer.Themessagelayercanfilter,aggregateandtransformthemessagesasneeded. 3.Storagelayer-Thislayermanagesthedatarepository,includingdatabasesandfilesystems.Itstoresthedatapub