Distributed Systems Java RMI Chat System Project documentation
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1 PatrickNeubauer,TenzinDakpa DistributedSystems FreeUniversityofBolzano RMIChatSystemdocumentation Distributed Systems Java RMI Chat System Project documentation Projectdocumentationcontent: Al g o r i t h m D e s i g n 2 o Descriptionofsequence/flowchart o U M L d i a g r a m o Classes Testing 6 o Bugs o Performance C o m p a r i s o n w i t h the TCP i m p l e m e n t a t i o n 7 Installationandusageguide 8 usageoftheserver usageofclient.html A p p e n d i x : o S o u r c e c o d e (/sourcepdfs) Server.java ServerInterface.java ChatObject.java ChatObjectInterface.java Client.java o JavaDocPages(/dist/javadoc/index.html) page1
2 PatrickNeubauer,TenzinDakpa DistributedSystems FreeUniversityofBolzano RMIChatSystemdocumentation Algorithmdesign Thechatsystembasicallyretainsthesamebroadoutlineofthealgorithmonwhichwehad madetheprevioustcpimplementation.however,byusingrmi,weareabletoreduce workloadontheserver,whichinthetcpversionhadtoanalyzeeachmessagefromclients andparseitintoeithercommandsorregulartextmessage. Interfaces: TheinterfacesextendsRemoteClass. Server:ServerInterface Theserverinterfacesprovidesthreefollowingmethods. 1. Jointheserver:join() 2. Sendmessagetootherusers:send() 3. Disconnectfromtheserver:disconnect() Client:ChatObjectInterface Theclientinterfaceprovidesasinglemethod,whichwrapstheoldfunctionalityofthe previoustcpversion. Itbasicallymakestheclientdisplayamessageorsignalittoquit: handle(); Class Server:Server TheclassServerextendstheUnicastRemoteObjectandimplementstheserver interface.thisistheoneandonlyexecutablefortheserver. Client:ChatObject Aswehaverealizedthemainclientapplicationasanapplet,wehadtoimplementthe UnicastRemotObjectinthisClass.Thisclasswrapsaroundtheappletclasstoprovidethe remotefunctionalitytotheclient.thechatobjectinterfaceisimplementedinthisclass. Client:Clientapplet ClientappletreusedtheoldcodesfromtheTCPimplementation.Ithasbeenslightly updatedtomeldwiththechatobjectclasstoprovideremoteimplementation. Descriptionofsequence/flowchart: Server 0. Startrmiregistry. 1. Registertheserveras RMICHAT 2. Waitforclientstocallitsconnect()RMImethod. 3. ThismethodgivestotheserveraremotestuboftheClient. 4. Onsuccessfulconnectionaddthisclientstubtothelistofconnectedclientsandsend awelcomemessagetotheclientusingthermimethodoftheclientremoteobject. ChatObject.handle( Welcome ) 5. Waitforclienttocallthenextserverrmimethodsend(Stringmessage)thismethod page2
3 PatrickNeubauer,TenzinDakpa DistributedSystems FreeUniversityofBolzano RMIChatSystemdocumentation takesthestringpassedasparameterandbroadcastittoalltheclientregisteredin theserver. 6. Waitforclienttocallthelastserverrmimethoddisconnect()whichremovesthe referenceoftheremoteclientintheserverslistofclient. 7. Whentheserveradministratororderstheservertoshutdown,closetheprogram.(as courtesy,informconnectedclientthatserverwillshutdown.notimplemented.) Client 0. Getthehostaddressoftheserverfromtheuser. 1. Lookupandgettheserverstubusingthelookup.Thisgivestheserverremote referencetotheclient. 2. CreateaChatObject.Itistheremoteobjectoftheclient. 3. Calltheserverrmimethodconnect()andsenditsownstub(ChatObject)sothatthe servercanusethemethodspresentlocallyontheclient. 4. Theserverwillsendawelcomemessagetotheclientiftheclienthasbeen succesfullyconnected. 5. Theclientcannowchatwithotherusers.Typethemessageandclickonthesend buttontocallthermimethodserver.send(stringmessage).theeffectofthis methodhasbeendescribedearlier. 6. Theclientcandisconnectfromtheserverbysendingthermimethod Server.disconnect().Ontheserversidetheclientstubisremovedfromthelistof clients,whichwillstoptheclientfromreceivinganynewmessage. 7. Asourclienthasbeenrealizedasanapplet,wesimplydisablethecontrolofthe appletandasktheusertoclosethewebpage. RMICHATSYSTEMPROGRAMSEQUENCEGRAPH: page3
4 PatrickNeubauer,TenzinDakpa DistributedSystems FreeUniversityofBolzano RMIChatSystemdocumentation UMLdiagram: UMLdiagramforserver: page4
5 PatrickNeubauer,TenzinDakpa DistributedSystems FreeUniversityofBolzano RMIChatSystemdocumentation UMLdiagramforclient: Classes: Therearetheflowingclassesbeingusedfromtheserver: Server.java ServerInterface.java Therearetheflowingclassesbeingusedfromtheclient: ChatObject.java ChatObjectInterface.java Client.java page5
6 PatrickNeubauer,TenzinDakpa DistributedSystems FreeUniversityofBolzano RMIChatSystemdocumentation Testing: Deployment TheserversuccessfullyrunsonWindowsXP,kubuntu8.04,MacOSX TheclientappletsuccessfullyworksinFirefox3andIE7andSafari. Bugs! Wehavenomajorbugs.Theprogramisfunctional,andmoderatelysafe.Wehaveusedone deprecatedmethodsbelongingtothethreadclass,whichresultsincompilerwarnings. Performancetestingidea Wewouldliketotesttheserverperformanceinthefollowingway.Wedefineastandard testmessage,astringof80chars.wethenmodifyourclientsoastobeabletosendthis testmessageandconfirmthatitreachestheserveranditisechoedbacktotheclient. Eachclienthasauniquetestmessagesothatitwillbeabletoidentifyitsecho. Theclientwillsendafixednumberoftestmessagesandcounthowmanyofthemessagesis receivedback,andcalculatethetimetakenbyeachmessage. Thetestscenario:westarttheserver. Thenweconnect1,5,10,20,30,50clients. Ateachpopulationlevel,wedothetestandplottheaverageresponsetimeandreliabilityin atable,likethefollowing: No.ofClient MessageLoss Latency Messageloss=(messagesent received)/100 Latency=sumoflatencyforeachmessage/noofmessagereceived AsnextwedothesameperformancetestfortheTCPimplementationoftheserver. Finally,wegetanideaofthewholeperformanceofbothsystems. DifferencesfromtheTCPImplementation page6
7 PatrickNeubauer,TenzinDakpa DistributedSystems FreeUniversityofBolzano RMIChatSystemdocumentation Themajordifferencesfromtheprogrammer spointofviewisthattheprogramismuch simplerandeasiertounderstand.abeginnerjavaprogrammercanstartimplementingthis kindofnetworkapplicationwithouthavingtodealwithlowlevelnetworki/olikesockets, tcpprotocolsetc. Regardingreliability:theRMIabstractionofmakingthenetworkinvisiblebetweentheclient andtheservereffectsthereliabilityofthechatserviceinseveralways. ItisdebatablewhetherthisoverheadinwrappingourserviceinRMImethodsjustifythe extracodingwhichmayintroduceadditionalbugs.itisalsonotclearhowefficientlyand safelyrmicanhandlemultiplethreads.thereforwedonotknowhowwellthisserverwill scaleuptosupportlargernumberofclientsreliably.atpresentwehavelimitedourserver toafixedmaximumlimitof50clients. Performance: Ascanbeexpected,theRMIabstractioncomesatacostofhighersystemrequirement(call marshallingandsoon)thenacomparabletcpserver.atpresent,ourrmimethodsdirectly interactwiththeserverobjectandclientobject.thisissignificantlyslowerthensending simpletextmessageaswasdoneinthetcpserver.weareawarethatabetterandmore efficientwayofimplementingtheserverwouldbetothinkoftheserverasanetwork printer.itwouldspoolorqueuethemessage,andatthesametime,asecondthreadwill takemessagefromthequeueandsendittoalltheclient.ontheclientside,therecouldbea localmessage inqueue,whichwillreceivemessagefromtheserverssecondthread.this enabletheservertoreturnquicklyfromthermimethodofsendingmessagetoclient.on theclientside,thermimethodtosendmessageotheserverwillalsoreturnquickly(asit hasonlytoenterthemessageinthequeue)andasimilarsecondthreadwoulddisplaythe messageinthequeue.theseproposalsareaimedatreducingthetimeonthermimethods, astheytakemoretimetoexecutethenlocalmethods.thiswayourperformancegap betweenthermiserverandtcpserverwouldbeminimum. InstallationandUsageGuide: page7
8 PatrickNeubauer,TenzinDakpa DistributedSystems FreeUniversityofBolzano RMIChatSystemdocumentation Forrunningtheserverpleasefollowtheseinstructions: UsageoftheServer: Usethecommandlineandbesurethatyouareinthesamefolderwhereyoufind alsothisdocumentation,theclient.htmlandthefolderfortheclientandthe server. ThenyoucanlaunchtheRMIregistrywiththefollowingcommand(afterthat nothingspecialhappensbutpleasedon tclosethisterminalwindowwhile runningtheserver): o rmiregistry Openanewterminalwindowandtypethefollowingcommandforstartingthe server: o java rmiserver.server Ifyougetapop upwindowinwhichiswritten Serverrunning,pressyestostop theserverstartedcorrectly. Youcanstoptheserverclickonthe Yes button,thentheprogramterminates. Asnextyoucanalsoterminatethermiregistrybychangingtotheterminal windowwherethermiregistrywasstartedandtype^c. Usageof client.html : Useyourwebbrowsertostarttheclient.Besurethatthe client.html fileisina folderthathasasubfolder rmiclient thatcontainsthenecessaryfilesfor launchingtheclient. Thenyoucanlaunchtheclientbyclickingon client.html orexplicitlylaunching itbyyourwebbrowser(ifnotautomaticallyopened). AsnextyouareaskedtoentertheIPoftheserverandyourusername. Thentheappletgetslaunchedandyoucanconnectfinallytotheserverwhich youhaveenteredbyclickingonthe Connect button.besurethattheserveris runningifyouraretestingitonyourlocalmachine. Nowyouareabletosendmessagesbytypingitintotheemptyfieldandclicking on Send buttonforsendingit. Forleavingthechatyoucanclickonthe Bye buttonandthenclosethebrowser window. page8
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