http缓存系统设计及实现

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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