计算机专业BS模式中英文文献Word下载.docx
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计算机专业BS模式中英文文献Word下载.docx
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Client/serverandcustomerend/serverholdthearchitectureofC/S.
Thecustomer/serverstructureoftwofloor.
Customer/server(Client/Server)modelisakindofgoodsoftwarearchitecture,itistheoneofbestapplicationpatternofnetwork.Fromtechnology,seethatitisalogicconcept,denotewillaapplicationmanytasksofdecomposingdifferencecarryout,commoncompletionisentiretoapplythefunctionoftask.Oneachnetworkmaincomputerofwebsite,resource(hardware,softwareanddata)divideintostep,isnotbalanced,undercustomer/serverstructure,withouttheclientcomputerofresourcethroughsendingrequesttotheserverthathasresource,getresourcerequest,someettheresourcedistributioninnetworknotbalancedness.Withthiskindofstructure,cansynthesizevariouscomputerstocooperatewithwork,letiteachcan,realizethescaleforthesystemofcomputeroptimization(Rightsizing)withscalereducetomelt(Downsizing).Pictureisasfollows:
Itismostoftodivideintocomputernetworkapplicationintotwo,inwhichtheresourceandfunctionthatpartsupportsmanyuserstoshare,itisrealizedbyserver;
Anotherpartfaceseveryuser,isrealizedbyclientcomputer,alsonamely,clientcomputerisusualtocarryoutprosceniumfunction,realizesman-machineinteractionthroughuserinterface,oristheapplicationprogramofspecificconducteduser.Andserverusuallycarriesoutthefunctionofbackstagesupporter,managestheoutsiderequestconcerningsetingup,acceptingandreplyinguserthatshared.Foracomputer,itcanhavedoublefunction,isbeingcertainandmomentarytocarvetoactasserver,andagainbecomesclientcomputerinanothertime.
Customer/servertypecomputerdivideintotwokinds,onesidewhooffersserviceiscalledasserver,asksonesideofservicetobecalledascustomer.Tobeabletoofferservice,serveronesidemusthavecertainhardwareandcorrespondingserversoftware;
Also,customeronesidemustalsohavecertainhardwareandcorrespondingcustomersoftware.
Theremustbeaagreementbetweenserverandcustomer,bothsidescommunicateaccordingtothisagreement.
Applycustomer/servermodelinInternetservice,therelationbetweencustomerandserverisnotimmutable.SomeInternetnodeoffersserviceontheonehand,alsogetsserviceontheotherhandfromothernode;
Itiseveninonetimedialoguecourse,mutualrolealsoexchangesprobably.Asincarryout,ifbecalledasonesidewhooffers,iscalledasonesidewhogets,whenusinggetormgetordersinceanothernodetakesfile,canthinkthatwhatselfuseanditisclientcomputer,isusingputormputordertoanothernodedispatchagainthinkthemachinethatusedselfisserver.
Multilayercustomer/serverstructure
Alongwiththedevelopmentofenterpriseapplication,recently,haveagainarisenakindofnewmultilayerarchitecture,itappliescustomerendtodivideintotwominutes:
Customerapplicationandserverapply.Customerapplicationisthepartoforiginalcustomerapplication,isanotherandpartialtohavebeentransferedtoservertoapply.Newcustomerapplicationtakestheresponsibilityforuserinterfaceandsimpleregularbusinesslogicandnewserverapplicationresidentcore,changeablebusinesslogic.Thereforeitsstructurehasbecomenew(Clientapplication+Serverapplication)/Serverstructure.Followingpictureshows:
ThiskindofstructurehassolvedtraditionalClient/Servercanexpandproblem,havereducedcustomerendbusinesslogic,andhavereducedtherequirementofcustomerendforhardware.Atthesametimebecauseofalotofbusinesslogicconcentrationshavegonetounitaryapplicationserveron,themaintenanceworkofapplicationsystemhadbeenalsoconcentratedtogether,haveeliminatedtheprobleminthetraditionalstructureofClient/Serverthatsoftwaredistributes.ThiskindofstructureiscalledasthearchitectureofB/S.
Browser/Serverandbrowser/serverholdthearchitectureofB/S.Onessence,Browser/ServerisalsoakindofstructureofClient/Server,itisakindoffromthetraditionaltwolevelsofstructuraldevelopmentofClient/Servercometothethree-layerstructuralspecialcaseofClient/ServerthatappliedonWeb.
InthesystemofBrowser/Server,usercanpassthroughbrowsertoalotofserversthatspreadonnetworktosendrequest.ThestructureofBrowser/Serverismaximumtohavesimplifiedtheworkofclientcomputer,onclientcomputer,needtoinstallanddeployfewcustomerendsoftwareonly,serverwillbearmorework,fordatabasevisitandapplyprogramcarryoutwillinserverfinish.
Underthethree-layerarchitectureofBrowser/Server,expresslayer(Presentatioon),functionlayer(BusinessLogic),datalayer(DataService)havebeencuttheunitof3relativeindependences:
Itisthefirstlayeroftoexpresslayer:
Webbrowser.
Inexpressinglayercontainsystemshowlogic,locateincustomerend.It'
staskistosuggestbyWebbrowsertothecertainaWebserveronnetworkthatserviceisasked,afterverifyingforuseridentity,WebserverdeliversneededhomepagewithHTTPagreementtocustomerend,clientcomputeracceptthehomepagepassed,andshowitinWebbrowseron.
Secondlayerfunctionlayer:
HavetheWebserveroftheapplicationfunctionofprogramextension.
Infunctionlayercontainthesystematichandlingofgeneralaffairslogic,locateinWebserverend.It'
staskistherequestconcerningacceptinguser,needtobefirstconductedandcorrespondingtoexpandapplicationprogramanddatabasetocarryoutconnection,passesthroughthewaiessuchasSQLtodatabaseservertoputforwarddatahandlingtoapplyfor,thenetc.databaseservertheresultofhandlingdatasubmittoWebserver,deliveragainbyWebservertoreturncustomerend.
Thenumberofpliesof3thaccordingtolayer:
Databaseserver.
Indatalayercontainsystematicdatahandlinglogic,locateindatabaseserverend.It'
staskistoaccepttherequestthatWebservercontrolsfordatabase,realizationisinquiredandmodifiedfordatabase,updateetc.function,submitoperationresulttoWebserver.
Carefulanalysisisbeeneasytosee,thearchitectureofBrowser/Serverofthree-layeristhehandlingofgeneralaffairsofthetwolevelsofstructureofClient/Serverlogicmodularfromthetaskofclientcomputerinsplit,fromthefirstfloorofindividualcompositionbearthepressureofitstaskandsuchclientcomputerhavealleviatedgreatly,distributeloadbalancedlyandhavegivenWebserver,sofromthestructuralchangeofClient/serveroforiginaltwofloorthestructureofBrowser/Serverofthree-layer.Thiskindofthree-layerarchitecturefollowingpictureshows.
Thiskindofstructurenotonlyclientcomputerfromheavyburdenandtherequirementofperformancethatrisescontinuouslyforitinliberationcomeout,alsodefendtechnologypeoplefromheavymaintenanceupgradingworkinfreeoneself.Sinceclientcomputerhandlesgeneralaffairs,logicpartialminuteshavegivenfunctionserver,makeclientcomputerrightoff"
slender"
alotof,donottaketheresponsibilityforhandlingcomplexcalculationanddataagainvisitetc.crucialgeneralaffairs,isresponsibletoshowpart,so,maintenancepeopledonotrushaboutagainforthemaintenanceworkofprogrambetweeneveryclientcomputer,andputmajorenergyintheprogramonfunctionserverupdatework.Betweenthiskindofthree-layerstructurallayerandlayer,themutuallyindependentchangeofanyfirstfloordoesnotaffectthefunctionofotherlayer.IthaschangedthedefectofthetwolevelsofarchitectureofClient/Serveroftraditionfromfoundation,itisthetransformwithdeeponceinapplicationsystematicarchitecture.
Thecontrastoftwoarchitectures
ThearchitectureofBrowser/ServerandthearchitectureofClient/ServercomparewithalladvantagesthatnotonlyhavethearchitectureofClient/ServerandalsohavethearchitectureofClinet/Servertheuniqueadvantagethatplacedoesnothave:
Openstandard:
ThestandardadoptedbyClient/Serveronlyindepartmentunificationforbut,it'
sapplicationisoftenforspecialpurpose.
Itislowertodevelopanddefendcost:
ItneedtobeimplementedonallclientcomputersthattheapplicationofClient/Servermustdevelopthecustomerendsoftwareforspecialpurpose,nomatterinstallationanddispositionescalatestill,havewastedmanpowerandmaterialresourcesmaximumly.TheapplicationofBrowser/Serverneedincustomerendhavegeneralbrowser,defendandescalatetoworkinserverendgoon,neednotcarryoutanychangeascustomerholds,havereducedthecostofdevelopmentandmaintenancesogreatly.
Itissimpletouse,interfacefriendly:
TheinterfaceoftheuserofClient/Serverisdecidedbycustomerendsoftware,interfaceandthemethodofitsusearenotidenticaleach,perpopularizeasystemofClient/Serveraskuserstudyfromthebeginning,ishardtouse.TheinterfaceoftheuserofBrowser/Serverisunifiedonbrowser,browseriseasytouse,interfacefriendly,mustnotstudyuseagainothersoftware,theuseofaLaoYongYithathassolveduserproblem.
Customerenddetumescence:
ThecustomerendofClient/Serverhasthefunctionthatshowsandhandlesdata,astherequirementofcustomerendisaclientcomputer"
itisfat"
veryhigh.ThecustomerofBrowser/Serverholdstheaccessthatnottakestheresponsibilityfordatabaseagainandtheetc.taskofc
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