the principle and application of protocol buffer

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1、ThePrincipleandApplicationofProtocolBufferThePrincipleandApplicationofProtocolBufferLUZhong-yangGUOZhen-bo（CollegeofInformationEngineering，QingdaoUniversity，QingdaoShandong266071，China）【Abstract】Thispapermainlyintroducestheprincipleofprotobufandconsidersitspressionefficiencyandthespeedofdataparsin

2、g.Thesimulationresultsrevealthat,paredlandjson,protobufhasthesamllestsizeofserializedfileandthefastestspeedofparsing.Therefore,oresuitableforsomeapplicationsrequiringhighperformance.【KeyeprovidedbyGoogle[1].Throughtheprotopiler,userscanpilethe.protofiletogeneratethecorrespondingclass,andthencallth

3、ecorrespondingmethodsintheclasstoserializeanddeserializethemessage.Java,c++andpythonarethreekindsoflanguageprovidedbyGoogle,landjson[2]andthecontentsofserializeddatatransferformatisbinary.Besides,protobufcanbeusedfordataexchangebetent,distributedapplicationofdatamunicationanddatastorageandconfigur

4、ationfilesandotherfields.Protobufisakindofprotocolmailyusedforobjectserializationandbinarycoding.Sincetheunderlyingmunicationprotocolisgeneralbinaryformat,ptotobufhastheadvantagesofsmalloccupiedspaceinthemunicationunicationis:protobufpacksthetransferingdataaccordingtothedefinedformatofmessageandth

5、eserilizesthemessagebeforesendingdata;thenitdeserilizesthepackagesatthereceivingside.2DesignaprotobuffileGenerally,essageformatandusingprotoasasuffixThedefinitionofthemessageformatisverysimple,andeachfieldhasatag,modifier(repeated/required/optional)andfieldtype(bool/bytes/string/int32/long)[3].The

6、valueoftherequiredfieldmustbeinitialized,otherakemistakesthatserializationanddeserializationarepiledunderthelibraryofDebugmode.Foroptionalfield,itployrepeatedfieldtodefinethatapersonultiplemobilephones.Thefunctionoftagistoidentifythepositionsofthefieldsinthebinarystream.Theformatofprotofileisdefin

7、edasbeloessageuser{requiredstringname=1；requiredint32age=2;}；(2)Generatingcodefilesaticallygeneratedbytheprotopiler[4],essageformatnaspecifictoserializetheusermessagetoafile.AndtheotherisaJavaprogram,afile.Figure