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外文翻译--基于Java的访问远程数据库的高效的标准软件体系结构 英文版.pdf

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外文翻译--基于Java的访问远程数据库的高效的标准软件体系结构 英文版.pdf

FUTUREGENERATIONCOMPUTERSYSTEMS151999417–424EFFICIENCYOFSTANDARDSOFTWAREARCHITECTURESFORJAVABASEDACCESSTOREMOTEDATABASESNZINGIRIAN,MMARESCA,SNALINDIPARTIMENTODIELETTRONICAEDINFORMATICA,UNIVERSITYOFPADUA,PADUA,ITALYACCEPTED14DECEMBER1998ABSTRACTNOVELCLIENT–SERVERARCHITECTURESFORREMOTEDATABASEACCESSAREINCREASINGLYTAKINGADVANTAGEOFWEBTECHNOLOGY,ADOPTINGWEBBROWSERSASGRAPHICUSERINTERFACESINTHECLIENTSANDTRADITIONALSQLDATABASEMANAGEMENTSYSTEMSDBMSSINTHESERVERSTHEINTEROPERATIONBETWEENSTANDARDBROWSERSANDSPECIFICDBMSSISTODAYSUPPORTEDBYANUMBEROFSOFTWAREARCHITECTURESBASEDONTHEJAVAVIRTUALMACHINEEMBEDDEDINLASTGENERATIONBROWSERSUNFORTUNATELYSUCHSOFTWAREARCHITECTURES,WHICHAPPEAREXCELLENTFROMTHEPOINTSOFVIEWOFOPENNESSANDFLEXIBILITY,INTRODUCECONSPICUOUSLATENCIESINDATABASEACCESSTHEOBJECTIVEOFTHISPAPERISTOIDENTIFYSUCHLATENCIESTHROUGHTHEANALYSISOFANUMBEROFEXPERIMENTALRESULTSTHEPAPERDESCRIBESFOURDIFFERENTSOFTWAREARCHITECTURESSUPPORTINGJAVABASEDSQLDATABASEACCESS,REPORTSTHEIRPERFORMANCEMEASUREMENTSONDIFFERENTHARDWAREPLATFORMSANDCOMPARESTHERESULTSOBTAINEDC1999ELSEVIERSCIENCEBVALLRIGHTSRESERVEDKEYWORDSCORBA;JAVA;JDBC;PERFORMANCEEVALUATION;VISUALDATABASEACCESS1INTRODUCTIONTHETRADITIONALAPPROACHTOCLIENT–SERVERDATABASEACCESSISBASEDONTHECOMBINEDACTIONOFAUSERINTERFACEWRITTENINAVISUALLANGUAGEIETHECLIENTANDASTANDARDSQLENGINEIETHESERVERCURRENTLY,THISAPPROACHISCHALLENGEDBYNOVELSOLUTIONSBASEDONTHEEMERGINGWEBPARADIGM1INTHEWEBBASEDSOLUTIONSTHEUSERINTERFACE,TYPICALLYWRITTENINJAVA,ISDOWNLOADEDBYABROWSERFROMTHESERVERANDRUNSONTHEBROWSERVIRTUALMACHINETHEMAINPOINTOFSUCHSOLUTIONSISTHATTHECLIENTSOFTWARERESIDESINTHESERVERSYSTEMASAUNIQUECOPY,RATHERTHANBEINGREPLICATEDINTHECLIENTSYSTEMSTHISFACTALLOWSTHECOSTSOFINSTALLATION,CONFIGURATIONANDMAINTENANCEOFTHECLIENTSOFTWARETOBEREDUCEDTHANKSTOTHEPOSSIBILITYOFCENTRALISINGALLTHESEOPERATIONSATTHESERVERSITE2WEBBASEDACCESSTOSQLDATABASESCANBESUPPORTEDBYANUMBEROFSOFTWAREARCHITECTURES3CHARACTERIZEDBYADIFFERENTCOMPOSITIONOFASETOFBASICCOMPONENTS4UNFORTUNATELYSUCHSOFTWAREARCHITECTURES,WHICHAPPEAREXCELLENTFROMTHEPOINTOFVIEWOFOPENNESSANDFLEXIBILITY,INTRODUCECONSPICUOUSLATENCIESINDATABASEACCESSCORRESPONDINGAUTHOR0167739X/99/–SEEFRONTMATTERC1999ELSEVIERSCIENCEBVALLRIGHTSRESERVEDPIIS0167739X98000855418NZINGIRIANETAL/FUTUREGENERATIONCOMPUTERSYSTEMS151999417–424FIG1SOFTWAREARCHITECTURE1DATABASEACCESSTHROUGHJAVASOCKETSTHEOBJECTIVEOFTHESTUDYPRESENTEDINTHISPAPERISTODESCRIBEFOURDIFFERENTSOFTWAREARCHITECTURESIMPLEMENTINGWEBBASEDSQLDATABASEACCESSANDTOREPORTANDCOMPARETHEIRPERFORMANCES,CHARACTERIZINGTHESOURCESOFTHELATENCIESINTRODUCEDBYEACHARCHITECTURETHEPAPERISORGANIZEDASFOLLOWSFIRSTWEDESCRIBETHESTANDARDSOFTWAREARCHITECTURESFORJAVABASEDDATABASEACCESSSECTION2THENWEPRESENTTHETESTBEDUSEDANDTHEMETHODOLOGYFOLLOWEDINOUREXPERIMENTSSECTION3FINALLYWEPRESENTTHERESULTSOFTHEEXPERIMENTSSECTION4ANDDISCUSSTHEPERFORMANCEPROFILEOFTHESOFTWAREARCHITECTURESTESTEDSECTION5ABRIEFSUMMARYSECTION6CONCLUDESTHEPAPER2SOFTWAREARCHITECTURESFORJAVABASEDDATABASEACCESSINTHISSECTIONWEPRESENTTHEFOURSOFTWAREARCHITECTURESFORJAVABASEDDATABASEACCESSTHATWESELECTEDFOROURINVESTIGATIONEACHARCHITECTURECOMPLIESWITHTHECLIENT–SERVERPARADIGMANDCONSISTSOFTHREEMAINENTITIESTHECLIENT,THESERVERANDTHEINTEROPERABILITYCOMPONENTSTHECLIENTANDTHESERVERARETHESAMEINEACHARCHITECTURE;THEINTEROPERABILITYCOMPONENTSARETHEDISTINCTIVEFEATUREFOREACHARCHITECTURETHECLIENTISAJAVAENABLEDBROWSER,THESERVERISASQLDATABASEMANAGEMENTSYSTEMDBMSWHICHACCEPTSREMOTENETWORKCONNECTIONSANDQUERIESWEASSUMETHATTHENETWORKPROTOCOLSTACKISBASEDONTHETCP/IPPROTOCOLSUITETHEINTEROPERABILITYCOMPONENTSOFEACHSOFTWAREARCHITECTUREAREDESCRIBEDINTHERESTOFTHESECTION21ARCHITECTUREBASEDONJAVASOCKETCONNECTIVITYMODULESTHESCHEMEOFTHEARCHITECTUREBASEDONJAVASOCKETCONNECTIVITYMODULESISDEPICTEDINFIG1THESHADEDBLOCKSREPRESENTTHESOFTWAREMODULESTHATTHEPROGRAMMERHASTODEVELOPTOINTERCONNECTTHEEXISTINGCOMPONENTSTHECLIENTBROWSERDOWNLOADSANAPPLETFROMTHESERVERMACHINEANDRUNSITTHEAPPLETSENDSTHEQUERIESANDRECEIVESTHERESPONSESTHROUGHTHEJAVASOCKETMODULESTHESERVERDBMSEXCHANGESDATAWITHTHECLIENTTHROUGHASOFTWARECOMPONENTTHATACTSASANINTERMEDIATECUSTOMAGENTSUCHANINTERMEDIATECUSTOMAGENTRECEIVESTHECLIENTQUERIESANDSUBMITSTHEMTOTHEDATABASETHROUGHTHEDATABASEAPILIBRARYTHECONNECTIVITYBETWEENTHEAPPLETANDTHECUSTOMAGENTISBASEDONTCP/IPONTHECLIENTSIDECOMMUNICATIONISSUPPORTEDBYTHESTANDARDJAVASOCKETAPI;ONTHESERVERSIDECOMMUNICATIONISSUPPORTEDBYTHESTANDARDUNIXSOCKETINTERFACEINTEROPERATIONBETWEENTHEAPPLETANDTHECUSTOMAGENTISBASEDONACUSTOMPROTOCOLWHICHSUPPORTSTHEFUNDAMENTALDATABASEACCESSOPERATIONSOPENDATABASE,SUBMITQUERY,RETRIEVERESPONSE,CLOSEDATABASE22ARCHITECTUREBASEDONPROPRIETARYDBMSJDBCDRIVERTHEARCHITECTUREBASEDONPROPRIETARYDBMSJDBCDRIVERISDEPICTEDINFIG2JAVADATABASECONNECTIVITYJDBCISASTANDARDINTERFACEWHICHALLOWSJAVAAPPLETSANDAPPLICATIONSTOINTEROPERATEWITHDATABASELIKEINNZINGIRIANETAL/FUTUREGENERATIONCOMPUTERSYSTEMS151999417–424419FIG2SOFTWAREARCHITECTUREFORDATABASEACCESSBASEDONDBMSPROPRIETARYJAVAJDBCFIG3SOFTWAREARCHITECTUREFORDATABASEACCESSBASEDONJAVAJDBCANDREQUESTBROKERTHEPREVIOUSARCHITECTU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