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ID:33322934
大小:12.52 MB
页数:67页
时间:2019-02-24
《http缓存系统设计及实现》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、西南交通大学硕士研究生学位论文第1I页ABSTRACTInrecentyears,thenumberofIntemetusersandthedemandforIntemetapplicationshasquicklyincreased,andagreatamountofdatatrafficconsumesnetworkbandwidth,resultinginadeclineinnetworkcongestionanddatatransmissionspeed.Therefore,Webcachetechnologyhasbecomeahotresearchfieldofnetw
2、orkapplication.Inthethesis,晰ththecurrentmainstreamofcachetechnologyclassifiedandanalysed,wefindthatwhenthefamouscacheproxyserver,likeSquidorApache,isrunningandthecachemissestheuser’Srequest,theprocessbasedonmonitoringbyinterceptionwilladdextrauser’Saccessdelay.Inordertosolvethisproblem,thethes
3、isputsforwardthecachetechnologybasedonmonitoringbybypassmirrored.ThetechnologyusesbypassportmirroredtomonitorusersInternettraffic.Accordingtothetendencyofusers’request,thesystemdownloadsandcachestheWebresourceswhicharefrequentlyrequested.Whenthecachesystemlistenstoauser’Srequestandtherequested
4、Webresourcehasbeencached,thesystemwillusetheHTTPsession蝎ackingtechnologytoguidetheusertocachesystemtoobtaintheresourcesneeded.SOtheusernolongerneedstoconnect耐maremoteWebserver.Therefore,thecachetechnologybasedonmonitoringbybypassmirrorednotonlyreducesnetworkoutletflow,savesbandwidthcharges,acc
5、eleratesuser’saccessandtransmissionspeed,atthesalTletimesolvestheissuethatcachetechnologybasedonmonitoringbyinterceptionaffectstheuseraccessdelay.OurHTTPcachesystembasedonmonitoringbybypassmirroredisdesigrtedontheWindowsplatform.Forachievingmirroredmonitoringfunction,ThesystemusesWinPcaptoolto
6、capturerawnetworkpacketsfromtheimageflow,andthroughnetworkprotocolanalysisandfiltering,thesystemgetstheinformationofuserrequestingWebresource.ForWebresourceswhichusersfrequentlyrequest,systemusesSocketprogramtodownloadthemfromextemalnetworkandcachethemondisk.Forachievingthemanagementanddistrib
7、utionofdiskcache,ThesystemusesIISprogramtoestablishtheIntranetHTTPserver,Guidinguserstoobtainthecachedresourcesisbypacketagingtheresponsepacketcontainingthecachelocation,andthesystemactasWebservertocheatuserstoobtainresourcesfromIntrane
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