基于的多媒体资源管理系统doc.docx

基于的多媒体资源管理系统doc.docx

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基于的多媒体资源管理系统doc

基于SOA的多媒体资源管理系统7

ASOA-basedGeneralMultimediaResourceManagement

System1

WangJiayu

BeijingKeyLaboratoryofIntelligentTelecommunicationSoftwareandMultimedia，BeijingUniversityofPostsandTelecommunications，Beijing（100876）

E-mail：

wangjy@

Abstract

Inthecurrentcomputerapplication,buildingageneralmultimediaresourcesmanagementsystemtodevelopthepotentialofexistentsimilarmanagementsystemisahotspot.Thispaperwillfirstanalyzethedevelopmentofthecurrentmultimediaresourcesmanagementsystem.ThenrelyingonSOAandmiddlewareframework,weimprovethecurrentmultimediamanagementmodeltoachievethegoalsofmanagementoptimizationandsystemintegration:

openness,flexibility,simplicity,scalability.Secondly,wedesignasystembasedofthemodel.Finally,wedevelopanexampletoprovethatthemodelisagoodevidenceofthemultimediainformationmanagementwithhighpracticalvalue.

Keywords：

SOA，Middleware，MultimediaResourceManagement

1Introduction

Withthedevelopmentofnetworktechnologyandapplications,thequantityandtypesofmultimediaresourcesgrowthrapidly.Theareaofmultimediatechnologywillbecomelargerandthenumberofpracticalsystemswillincreaseeveryyear.Obviously,theresourcesinformationwillbeasignificantgrowth.Therefore,itisimportanttomanagetheinformationefficiently[4].Buttheexistingmultimediamateriallibrariesoftenlackofthedescriptiveinformationaboutmultimediaresources.Theorganizationandmanagementformultimediaresourcesareunsatisfactory.Andtheeffortsaboutsearchingmultimediaresourcesarenotenough.Thosearealldifficulttosatisfyapplicationrequirements.Fortheabovedemand,weneedaneffectivemultimediaresourcesmanagementsystemwhichcanprovideafriendlyuserinterface,themorerichapplicationservices,andcanbuildthesystembyscalabilityandversatility.

TheusingofSOAwilltakeweachievethesystem.Service-orientedarchitectureisanindependentfunctionalentitywhichcompletesspecifictasksbyconnectingtosolvetheneedsofbusinessininternetenvironment[6].SOAisabletomaketheresponsibilitiesofvariousfunctionsmoreclearlyinawholesystem.Italsocanshortenthedevelopmentcycleandreducemaintenancetimetohaveamoreefficientwaysofutilizingresources.Meanwhile,wewillusemiddlewaretechnologywhichcanshieldthecomplexityofapplicationinunderlyingoperatingsystem.Sodeveloperswillfaceasimpleandunifieddevelopmentenvironmentwhichcanreducethecomplexityofthedesignprocess.Andtheywillfocusattentionontheprovisionoftheirserviceswithoutreiterationworkingindifferentsoftwaresystems.Thusmiddlewarecangreatlyreducethetechnicalburden.Weadopttheframeworkandtechnologytoperfecttheexistingmanagementsystemtomanagethemultimediamaterialmoreeffectively.

Theotherpartofthispaperisarrangedasfollow:

inthesecondchapterwewilldiscussandanalyzeexistingmultimediaresourcesmanagementsystem;inthethirdchapter,wewillgiveasystemmodelanditsarchitecture;thenextchapter,wewilluseanexampletoexplainoursystems;finally,wesummarizethepaper.

1ThisworkreportedinthispaperissupportedbytheSpecializedResearchFundfortheDoctoralProgaramofHigherEducationunderGrantNo.200*********andSpecialItemsFundofBeijingMunicipalCommissionofEducation（ItemNo.SYS100130422）.

2RelatedWorks

Currently,theexistingmultimediaresourcesmanagementsystemscommonlyusethismodelasfollowing.Forexample,theDigital-Item-BasedMediaManagementSystem[3]byRichardJ.Qianisthetypicalmodel.Thesebasicdesignsofthestructurearesimilar.

ThesystemcanbesummedupwithafigureasFigure1.

Figure1systemstructure

Althoughfromtheirindividualperspective,suchsystems’operability,flexibility,richnessoftheirfunctionsandscalabilitycanberealizedbetter.Butwejudgeasystemnotonlyfromtheircapabilitiesandperformanceconsiderations,butalsofromtheroleintheentireapplicationenvironment.Fromthisperspective,wewillfindinadequatewhenthesystemintheactualoperation:

First,redundantdataofmultimediaresourcesandtheirrecordsmaybeproducedwhenthesystemoperating.Itwillmakesystem’sconsistencydeteriorate.

Secondly,thefunctionsareredundant.Althoughsomeofthesystem’sfunctionsmaybedissimilar,wefindthattherearealsocommoncodesandresourcesintheirsubsystemswhenwedecomposethemultimediamanagesystem.Ifwedevelopanewmediafunctionwithrebuildingallcodes,wewillwastelongertimeandmoreresources.

Third,itisdifficulttodevelopanewsystembyusingtheoldone.Inpracticalapplicationenvironment,reusingofmultimediaresourcesisextremelydifficultbecauseofthedifferencesofdevelopmenttools,actualoperatingenvironmentsandsystemarchitectures.Wehavetoreadlotsofcodesanddesigndocumentstobefamiliarwithitsinternalstructure.Itmeansthatworkloadofreusingisnotlessthanrebuilding.Further,ifthefunctionbeeliminatedoneday,itwouldcausetroubletooursystem.

Atthemoment,wesolvetheproblemsbyintroducingtheconceptofSOAandmiddlewaretechnology.Aconcreteexplanationwillbeexplainedinthenextchapter.

3Architecture

Basedonpreviousresearchandanalysis,weattemptedtousemiddlewareandSOAtoimprovethestructureoftheoriginalmodel,andeventuallygivenaconcreterealizationofthemodel.

3.1.1DesignPrinciplesandDesignObjectives

Thedesignprinciplesandaimsareshowedasfollows:

（1）First,thesystemwillbeusedforgeneralmultimediaresourcesmanagement.Sowehopethatthelinkbetweendifferentapplicationcomponents’interfaceandtheirfunctionsorstructuresisloosetoensuretheirflexibility.Andtheycancontinuetoexistwheneachservice'sinternalstructureintheentireapplicationprocesschanged.[8]

WeadopttheSOA.Itisacomponentmodel[2]withapurposeofcommonusingandscalability.Itisajointcollaborativeframework.Itdefinesallprocessesasservicesandlinksdifferentfunctionalunits（calledservices）throughinterfacesandconventionswhichdefinedwellbetweenservices.Interfacesaredefinedneutrality;itindependentfromhardwareplatforms,operatingsystemsandprogramminglanguagestoensurethatservicesinthesysteminteractbyaunifiedandcommonway.WhiletheSOA-basedsystemdoesnotexcludeusinganobject-orienteddesigntobuildasingleservice,itsoveralldesignisaservice-oriented[5].Thedifferenceistheinterfacesthemselvesasfollow[1]:

a.Allfunctionsaredefinedasservicesincludingbusinessfunctions,businessservicesandsystemsservicesfunctionswhicharecomposedfromthebottomfunctions.

b.Allservicesareindependent.Theyrunasthe"blackbox":

externalcomponentsneitherknownorconcernabouthowtoexecutethefunctions,butonlycareaboutwhetherornotreturningthedesiredresults.

c.Inthegeneralsense,theinterfaceisavailable;Inotherwords,fromthearchitecturelevel,wedon’tcareaboutwhethertheyarelocal（withinthesystem）orremotely（beyondthedirectsystems）,andwhatkindofprotocoltocallorwhatkindofstructuretoconnect.

Therefore,weusedtheSOAtomaintaintheirlooselycoupledbetweenapplications;

（2）Naturally,weexpectapplicationdevelopersfacingasimpleandunifieddevelopmentenvironment.Itwillreducethecomplexityoftheprocesstofocusdevelopers’attentiononwhatservicestheyprovide,withoutduplicateworkintransplantbetweendifferentsoftwaresystems.Thiswillgreatlyreducetheburdenonthetechnical.Middlewarecancomplywiththerequirements.[8]Middlewareasanspeciallevelbetweenthesystemsoftwareandapplicationisabstractedasatypicalapplicationmodel,sothatsoftwaremakerscanfocusonbusinesslogic,andcandevelopbyastandards-basedformway.Itmakesthesoftwarearchitecturebecomepossibly.Someindustrystandardstakemiddlewareastheoperatingframeworkofreusablecomponentstoacceleratepracticalprocessofsoftwarereusing.

Essentially,middlewareisanabstractionofdistributedapplication[7].Thusitabandonsthedetailsofbusinesslogicrelatedbyapplication,whileretainsthekeyfeaturesofthetypicaldistributeinteractivepattern.Throughtheabstracting,acomplexdistributedsystemisrefinedtoaunifiedformandshowstotheapplication.Applicationcanbeintegratedbetterwiththeenvironmentprovidedbymiddlewareintothebusinesslogic,andexistsastheformofcomponents.Finally,itcannaturallyachieveagoodeffectinaheterogeneousenvironment.

Itappearsthatusingthemiddlewaretechnologytoachieveoursystemisnotonlytosimplifythedevelopment,toshortenthedevelopmentcycleandtoreducetheworkloadofsystem'smaintenance,operationandmanagement,butalsoreducethecostofthewholeenvironment.

Therefore,wewillusemiddlewarewhichtakegreatpartinoverallplatformandtoresolvecommunicationbetweeneachapplication;

（3）Atthesametime,wewillprovidethemanagementandsecurityservicestoimprovethesystem.

Basedontheaboveprinciple,wedesignthehierarchicalmodelasfigure2:

Figure2hierarchicalmodel

FromFigure2,wecanseethatafterusingthemiddlewareplatform,eachapplicationcommunicatesthroughtheplatforminsteadofdirectlyinteraction.Thismakesthecallingapplication’slevelmoreclearly;meanwhile,newapplicationscanbebuiltonthemiddlewareplatformbyusingalotofservicesthroughthemiddlewareplatform;thenewservicewillbemoreconvenienttojoin,andtheexistingsystemwillnothaveanyimpact.Interfacesbetweenoriginalsystemandtheusershavenotch