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ZOOMPROJECTAUTOMATICCODEGENERATIONUMLSTATECHARTSTOEXECUTABLEJAVACODEMETAMODELANDFINITESTATEMACHINEFRAMEWORKDESIGNANOOPMATHEWSE696MASTERSPROJECTSUPERVISORDRXIAOPINGJIATABLEOFCONTENTSABSTRACT4INTRODUCTIONTOZOOM4PROBLEMSTATEMENT5PROJECTTEAM5RATIONALE5DESIGNACTIVITIES5INTRODUCTIONTOMDA6PROJECTARCHITECTURE7COMPARISONWITHXUML8UMLSTATECHARTOVERVIEW9STATES9EVENTS11TRANSITIONS12STATEENTRYRULES14STATEEXITRULES14SOFTWAREDESIGNDESCRIPTION15METAMODEL15FINITESTATEMACHINEFRAMEWORK17FUNCTIONALOVERVIEW17STATICMODELOVERVIEW18AMATHEWZOOMFRAMEWORKCLASSDESCRIPTIONS18AMATHEWZOOMLOGGINGCLASSDESCRIPTIONS23AMATHEWZOOMEXCEPTIONCLASSDESCRIPTIONS24DYNAMICMODELOVERVIEW25CREATINGANDSTARTINGASTATEMACHINE25SELECTINGASTATEMACHINEBYPRIMARYKEY26CREATINGANDPOSTINGANEVENT27SELECTINGANEVENTFORPROCESSING28PERFORMINGASTATETRANSITION30BENEFITSOFTHEFSMFRAMEWORK31USINGTHEFSMFRAMEWORK32POTENTIALAPPLICATIONS32KNOWNISSUES/LIMITATIONS32FUTUREWORK33CONCLUSION33REFERENCES34ABSTRACTDESIGNOFSOFTWARETHATISOFHIGHQUALITY,EASILYEXTENSIBLEANDREUSABLEAREKEYREQUIREMENTSOFANYSOFTWAREPROJECTDYNAMICCODEGENERATIONHASBEENTOUTEDASAPROMISINGEMERGINGTECHNIQUEFORACHIEVINGTHESESOFTWAREDEVELOPMENTGOALSTHEOVERALLGOALOFTHISPROJECTISDEVELOPTOOLS/SOFTWARETOTRANSLATEUMLSTATECHARTSANDSTATEIMPLEMENTATIONSINTOEXECUTABLEJAVACODEASPARTOFATEAMWORKINGONTHISPROJECT,MYINDIVIDUALRESPONSIBILITIESINCLUDEDDEVELOPMENTOFAMETAMODELTHATDESCRIBESUMLSTATECHARTSANDDESIGNOFANEXECUTABLESTATEMACHINEFRAMEWORKTHATSUPPORTSEXECUTIONOFUMLSTATECHARTSINTRODUCTIONTOZOOMZOOMSTANDSFORZOBJECTORIENTEDMODELINGITISBASEDONTHEZFORMALSPECIFICATIONMETHODZINITSORIGINALFORMDOESNOTSUPPORTOBJECTORIENTEDCONSTRUCTSITISMOREOFAMATHEMATICALSPECIFICATIONZOOMPROJECTHEADEDBYDRXIAOPINGJIAAIMSTOEXTENDZTOADDOBJECTORIENTEDCONSTRUCTSTHEPROJECTAIMSTOADDAFORMALASPECTTOOBJECTORIENTEDDESIGNUSINGUMLZOOMSUPPORTSSPECIFICATIONOFTHREE3KINDSOFMODELSTHESEARETHESTRUCTURALMODEL,THEBEHAVIORALMODELANDTHEUSERINTERFACEMODELTHESTRUCTURALMODELSPECIFIESTHESTATICPARTSOFTHESYSTEMINCLUDINGCLASSRELATIONSHIPSANDASSOCIATIONSTHEUSERINTERFACEMODELALLOWSFORTHEFORMALSPECIFICATIONOFTHEUSERINTERFACETHISALLOWSFORCREATIONOFUSERINTERFACESTHATAREFORMALINNATUREANDPLATFORMINDEPENDENTTHEBEHAVIORALMODELDESCRIBESTHEDYNAMICASPECTSOFTHESYSTEMITLINKSTHESTRUCTURALMODELSANDTHEUSERINTERFACEMODELSTHEBEHAVIORALMODELISSPECIFIEDUSINGAFINITESTATEMACHINEFSMTHEFSMFOLLOWSTHEUMLSEMANTICSFORSTATEMACHINESEVENTSAREUSEDTOCOMMUNICATEBETWEENTHEDIFFERENTFORMALMODELSEVENTSDRIVETHESYSTEMTHEUIMODELSGENERATEEVENTSWHENAUSERINTERACTSWITHTHESOFTWARESYSTEMTHISTRIGGERSFINITESTATEMACHINEEVENTSTHATCAUSEANOPERATIONTOOCCURWITHINTHESYSTEMTHEFOLLOWINGFIGURESHOWSTHERELATIONSHIPBETWEENTHESEFORMALMODELSPROBLEMSTATEMENTMYGOALSASPARTOFTHEZOOMPROJECTWERETODESIGNANFSMFRAMEWORKTOALLOWUSERSTOSPECIFYANDEXECUTEBEHAVIORALMODELSTHISFRAMEWORKHADTOBECOMPLIANTWITHUMLSEMANTICSFORSTATECHARTSSPECIFIEDINV15OFTHEOBJECTMANAGEMENTGROUPOMGUMLSPECIFICATIONANDHADTOSUPPORTADVANCEDFEATURESOFUMLSTATECHARTSIWASALSOTASKEDWITHCREATINGAMETAMODELFORTHESTATEMACHINEFRAMEWORKTHISMETAMODELWOULDBEBASEDONTHEOMGSTATEMACHINEANDEVENTABSTRACTSYNTAXBUTWOULDHAVEENHANCEMENTS/CUSTOMIZATIONSSPECIFICTOTHEZOOMPROJECTPROJECTTEAMTHEZOOMBEHAVIORALMODELSOFTWAREDEVELOPMENTTEAMCONSISTEDOFTHEFOLLOWINGTEAMMEMBERSTHEDEVELOPMENTRESPONSIBILITIESWERESPLITUPASFOLLOWSANOOPMATHEWMETAMODELANDFSMFRAMEWORKDEVELOPMENTMICHAELMONTENEGROTRANSLATIONENGINEDEVELOPMENTDRXIAOPINGJIAPROJECTLEADERRATIONALETHEREAREVARIOUSSTATECHARTBASEDDYNAMICCODEGENERATIONTOOLS/METHODOLOGIESAVAILABLETODAYSOMEOFTHESEINCLUDEEXECUTABLEUML,ROOMETCTHISPROJECTAIMSTOINCORPORATETHEBENEFITSOFTHESESOLUTIONSWHILEALSOADDRESSINGTHEDRAWBACKSOFTHESEVARIOUSSOLUTIONSTHESOLUTIONDEVELOPEDWILLAIMTOBEGENERICENOUGHTOALLOWGENERATIONOFEXECUTABLECODEINOTHERLANGUAGESASWELLDESIGNACTIVITIESINTHEFIRSTPHASEOFTHISPROJECT,IINVESTIGATEDOTHERSOFTWAREDEVELOPMENTTOOLS/METHODOLOGIESTHATSUPPORTAUTOMATICCODEGENERATIONUSINGUMLSTATECHARTSSPECIFICALLY,IINVESTIGATEDEXECUTABLEUMLXUMLTOUNDERSTANDTHESTRUCTURALMODELUIMODELBEHAVIORALMODELEVENTMODELFIGURE1ZOOMMODELSTRUCTUREADAPTEDFROMAFORMALFOUNDATIONSUPPORTINGMDDZOOMAPPROACHBYHONGMINGLIU,LIZHANGQIN,CHRISJONES,XIAOPINGJIABENEFITS/DRAWBACKSOFTHISMETHODOLOGYTHISHELPEDPROJECTTEAMANDISOLIDIFYTHEREQUIREMENTSANDPROVIDESOMECONTEXTFORTHISPROJECTASPARTOFTHISENDEAVOR,IRESEARCHEDEXECUTABLEUMLINGREATDETAILANDGAVEADETAILEDPRESENTATIONONTHETOPICTOTHESE690CLASSTHESECONDPHASEOFTHISPROJECTTHATIWORKEDONWASTESTINGTHEUMLSTATECHARTSPECIFICATIONSYNTAXFORCOMPLETENESSANDEASEOFUSETHISTASKENTAILEDUNDERSTANDINGTHEUMLSTATECHARTSPECIFICATION14PROVIDEDBYTHEOMGANDENSURINGTHATTHESYNTAXTHATHASBEENDESIGNEDISSUFFICIENTTOCOVERALLASPECTSOFDYNAMICSTATECHARTDESCRIPTIONTHETESTPROCESSINVOLVEDWRITINGSAMPLESTATECHARTDESCRIPTIONSUSINGTHESUPPLIEDSYNTAX,RUNNINGTHETESTFILESTHROUGHAPARSERWHICHHADBEENPROVIDEDANDANALYZINGTHEOUTPUTASPARTOFTHISEFFORTVARIOUSNEWADDITIONSWEREMADETOTHESYNTAXTOSUPPORTADVANCEDCONCEPTSOFUMLSTATECHARTSINTHETHIRDPHASEOFTHISPROJECT,IDEVELOPEDAMETAMODELTHATCOMPLETELYANDSUCCINCTLYDESCRIBEDUMLSTATECHARTSINTHEFOURTHPHASEOFTHEPROJECT,IDEVELOPEDAFINITESTATEMACHINEFRAMEWORKTHISAPPLICATIONFRAMEWORKPROVIDESBUILTINSUPPORTFORSPECIFICATIONANDEXECUTIONOFSTATEMACHINESANDSUPPORTEDADVANCEDCONSTRUCTSOFUMLSTATECHARTSINTRODUCTIONTOMDAMDASTANDSFORMODELDRIVENARCHITECTUREITISASTANDARDAPPROACHTODESIGNINGSOFTWARESYSTEMSDEVELOPEDBYOMGONCEOFTHEMAINGOALSOFMDAISTOALLOWSEPARATIONOFAPPLICATIONSOFTWAREDESIGNFROMIMPLEMENTATIONCONSIDERATIONSSUCHASPROGRAMMINGLANGUAGES,PLATFORMS,ANDOPERATINGSYSTEMSITPROMOTESAPPLICATIONSOFTWAREREUSESOFTWAREDEVELOPMENTUSINGMDAUSUALLYINVOLVESTHEFOLLOWINGSTEPSFIRST,APLATFORMINDEPENDENTMODELPIMOFTHEAPPLICATIONSOFTWAREISCREATEDTHISMODELISDESCRIBEDUSINGUMLNOTATIONSNEXT,APLATFORMSPECIFICMODELPSMISCREATEDTOMAPTHEPIMTOASPECIFICPLATFORMTHEPSMISALSOUSUALLYDESCRIBEDUSINGUMLNOTATIONSTHEPSMCANBECREATEDFROMTHEPIMUSINGMODELGENERATIONTOOLSONCETHEPSMHASBEENCREATED,CODEGENERATIONTOOLSCANCREATECODEFORTHATPLATFORMFROMTHEPSMTHISAPPROACHALLOWSFORREUSEOFTHEPIMFORMULTIPLEPLATFORMSPIMPSMPSMJAVACODECCODEFIGURE2MDAAPPROACHTOSOFTWAREDEVELOPMENTPROJECTARCHITECTURETHEDIAGRAMBELOWDESCRIBESTHECOMPONENTSDESIGNEDTOSUPPORTTHEBEHAVIORALMODELASPECTSOFTHEZOOMPROJECTANDTHERELATIONSHIPBETWEENTHESECOMPONENTSASTHEOVERALLPROJECTARCHITECTUREDIAGRAMDESCRIBESABOVE,THEPURPOSEOFTHEPROJECTWASTOPROVIDETOOLSANDAFRAMEWORKTOALLOWUSERSTOSPECIFYTHEBEHAVIORALMODELSINZOOMASFINITESTATEMACHINESANDPROVIDESUPPORTTOTRANSLATETHESEMODELSINTOJAVASOURCECODEANDTOBEABLETOFULLYEXECUTETHESEMODELSTHEPROJECTWASALSOMDACOMPLIANTTHEVARIOUSCOMPONENTSOFTHEPROJECTAREDESCRIBEDBELOWISTATECHARTDESCRIPTIONFSMSTATECHARTFILESORFSMFILESARETHETEXTUALREPRESENTATIONOFAGRAPHICALUMLSTATECHARTMODELITREPRESENTSTHEPIMITCONTAINSTHEDYNAMICASPECTSOFUMLSTATECHARTSITDESCRIBESTHESTATES,TRANSITIONS,ALLTHECOMPONENTSOFTRANSITIONS,ANDTHEEVENTSTHATCAUSETHETRANSITIONSITISDESCRIBEDUSINGTHESTATECHARTSPECIFICATIONSYNTAXTHEDESCRIPTIONISVERYSIMILARTOJAVASYNTAXTHEFSMFILEFORAGIVENSTATECHARTISTHEFIRSTCOMPONENTTHATAUSERSUPPLIESTOTHETRANSLATIONPROCESSGIVENBELOWISANEXAMPLEOFASTATECHARTDESCRIPTIONTRANSLATIONENGINEMODELGENERATORCODEGENERATORFINITESTATEMACHINEEXECUTIONFRAMEWORKSTATECHARTDESCRIPTIONFSMGENERATEDJAVACODEMETAMODELFRAMEWORKBASEDSTATEIMPLEMENTATIONSJAVACODEASTPARSEREXECUTABLEJAVACODEGENERATESFIGURE3PROJECTARCHITECTUREFSMSELLABLEITEMSTATERECEIVEDSTATEININSPECTIONSTATEACCEPTEDSTATEREJECTEDTRANSITIONINITIALTORECEIVEDTRANSITIONRECEIVEDTOININSPECTIONINSPECTORSELECTSITEMTRANSITIONININSPECTIONTOACCEPTEDINSPECTORACCEPTSITEMTRANSITIONININSPECTIONTOREJECTEDINSPECTORREJECTSITEMIIASTPARSERTHEASTPARSERISACOMPONENTDESIGNEDBYOTHERSTUDENTSWORKINGONTHEZOOMPROJECTTHEMAINPURPOSEOFTHEASTPARSERISTOENSURESYNTAXCORRECTNESSOFTHEFSMFILESANDTOCONVERTTHEFSMFILESINTOANABSTRACTSYNTAXTREEMODELTHEOUTPUTOFTHEASTPARSERISONEOFTHEINPUTSTOTHETRANSLATIONENGINEIIIMETAMODELTHEMETAMODELISANINPUTTOTHETRANSLATIONENGINEITISUSEDASTHETEMPLATETOCREATETHEMODELFORTHESTATECHARTTHATISDESCRIBEDINTHEFSMFILESUPPLIEDBYAUSERIVFINITESTATEMACHINEFRAMEWORKTHEFRAMEWORKPROVIDES2SPECIFICFUNCTIONSTHESEARETOALLOWTHEUSERTOSPECIFYTHESTATEIMPLEMENTATIONSASSOCIATEDWITHASTATECHARTANDTOALLOWTHEEXECUTIONOFTHESTATEMACHINESONCETHESOURCECODEHASBEENGENERATEDTHEFRAMEWORKHASTWOCLIENTSONEISTHEUSERWHOUSESTHEFRAMEWORKAPISTOSPECIFYTHESTATEIMPLEMENTATIONSTHESECONDISTHETRANSLATIONENGINETHATGENERATESTHEJAVASOURCECODEBASEDONTHEFRAMEWORKAPIVSTATEIMPLEMENTATIONSTHESECONDUSERSUPPLIEDCOMPONENTTOTHETRANSLATIONPROCESSAJAVASOURCEFILE,ITCONTAINSTHEFSMFRAMEWORKBASEDIMPLEMENTATIONSOFTHEACTIONSASSOCIATEDWITHTHESTATESDESCRIBEDINTHEFSMFILETHEUSERUSESTHEFRAMEWORKTOSPECIFYTHEENTRY,EXITANDDOACTIVITYMETHODSFOREACHSTATEVITRANSLATIONENGINETRANSLATESTHEFSMFILEANDSUPPLIEDSTATEIMPLEMENTATIONSINTOJAVACODETHETRANSLATIONENGINEREPRESENTSTHETOOLTHATCREATESTHEPSMANDTHEGENERATEDCODETHEGENERATEDJAVACODEISEXECUTABLEUSINGTHEFSMFRAMEWORKTHEREARE2SPECIFICFUNCTIONSPROVIDEDBYTHETRANSLATIONENGINEITFIRSTBUILDSAJAVABASEDMODELOFTHEUMLSTATECHARTUSINGTHEMETAMODELASATEMPLATETHISMODELISTHEPSMITTHENUSESTHEMODELANDTHESTATEIMPLEMENTATIONSTOGENERATETHEJAVASOURCECODETHATCONFORMSTOTHEFSMFRAMEWORKCOMPARISONWITHEXECUTABLEUMLEXECUTABLEUMLXUMLWASONEOFTHETECHNOLOGIESRESEARCHEDINTHEINITIALPHASEOFTHEPROJECTXUMLISANMDACOMPLIANTMETHODOLOGYTHATAIMSTOMAKEUMLMODELSEXECUTABLEITISANAUTOMATEDOBJECTORIENTEDMETHODOLOGYTHATUSESALIMITEDSETOFTHEUMLCONSTRUCTSXUMLEMPHASIZESTHESEPARATIONOFDESIGNFROMIMPLEMENTATIONDESIGNUSINGXUMLMETHODOLOGYINVOLVESCREATINGMODELSTHATDESCRIBETHEAPPLICATIONMINIMALLY,THESEMODELSINCLUDETHEUMLCLASSDIAGRAMFORTHEDOMAINSUNDERSTUDY,ASWELLASUMLSTATECHARTDIAGRAMSFORACTIVEOBJECTSWITHINTHECLASSDIAGRAMSTHEACTIONSTHATTHEOBJECTSPERFORMASTHEYCHANGESTATEISSPECIFIEDASWELLTHESEMODELSARETHEPIMAMODELCOMPILERTURNSTHESEMODELSINTOASPECIFICIMPLEMENTATIONBASEDONRULESSPECIFICTOANIMPLEMENTATIONTHESERULESARECALLEDARCHETYPESCOMPARINGXUMLTOZOOM,WECANSEETHATTHEYBOTHFOLLOWSIMILARAPPROACHESTOSUPPORTINGMDABOTHMETHODOLOGIESUSEUMLMODELSTODESCRIBEASYSTEMZOOMUSESSTRUCTURALANDBEHAVIORALMODELSWHILEXUMLUSESCLASSDIAGRAMSANDSTATECHARTDIAGRAMSTHEYBOTHALSOUSETHECONCEPTOFUMLSTATECHARTSTOSPECIFYTHEBEHAVIOROFTHESYSTEMTHEYBOTHALSOAUTOMATICALLYGENERATEEXECUTABLEAPPLICATIONSFROMTHESEMODELSTHEDIFFERENCESBETWEENTHESEAPPROACHESAREASFOLLOWSWHILEXUMLONLYSUPPORTSALIMITEDSETOFUMLSTATECHARTCONSTRUCTS,THEZOOMBEHAVIORALMODELSSUPPORTARICHSETINCLUDINGCOMPOSITE/CONCURRENTSTATES,STATEHISTORY,ANDSTATESYNCHRONIZATIONZOOMUSESTHEJAVALANGUAGETOSPECIFYTHESTATEACTIONSWHILEXUMLUSESACTIONSPECIFICATIONLANGUAGEASLTHATVARIESFROMONEVENDORSIMPLEMENTATIONTOANOTHERFINALLY,XUMLHASVENDORSUPPORTFORGRAPHICALTOOLSTOSPECIFYTHEMODELSWHILEZOOMBEHAVIORALMODELSARETEXTBASEDUMLSTATECHARTOVERVIEWINTHISSECTIONIWILLGIVEABRIEFOVERVIEWOFUMLSTATECHARTCONCEPTSTOPROVIDESOMEUNDERSTANDINGANDCONTEXTFORTHEFEATURESIMPLEMENTEDINTHEPROJECTSTATECHARTSDIAGRAMSAREUSEDWIDELYINREALTIMEANDEMBEDDEDSOFTWAREDEVELOPMENTTOSPECIFYSYSTEMBEHAVIORTHEYAREUSEDTOSPECIFYOBJECTBEHAVIORTHATISDYNAMIC,IEOBJECTBEHAVIORTHATCHANGESDEPENDINGONTHESTATEOFTHEOBJECTSTATECHARTSSHOWTHESTATESTHATANOBJECTMAYASSUMEANDTHETRANSITIONSCHANGEINSTATETHEOBJECTMAYMAKEFROMSTATETOSTATESTATECHARTSAREIDEALFORMODELINGSTATEATTRIBUTESTHEREARE3MAJORCOMPONENTSTOSTATECHARTSTHESEARESTATES,EVENTSANDTRANSITIONSSTATESASTATEREPRESENTSASTAGEINTHELIFECYCLEOFANOBJECTSTATESUSUALLYLASTSOMEFINITEDURATIONTHEREAREVARIOUSTYPESOFSTATESDEFINEDINTHEUMLMODELTHESEAREASFOLLOWSISIMPLESTATESSIMPLESTATESARESTATESTHATDONOTCONTAINOTHERSTATESIICOMPOSITESTATESTHESEARESTATESTHATCONTAINOTHERSTATESCOMPOSITESTATECANBENONCONCURRENTORCONCURRENTNONCONCURRENTSTATEISDEFINEDASASTATETHATCONTAINSEXACTLYONESTATEREGIONCONCURRENTCOMPOSITESTATEISDEFINEDASASTATEWHERETHEREARETWOORMORESTATEREGIONSTHATEXECUTEINDEPENDENTLYOFEACHOTHERSTATESCONTAINEDWITHINCOMPOSITESTATESAREUSUALLYREFERREDTOASSUBSTATESIIIFINALSTATEFINALSTATEREPRESENTSANOBJECTSCOMPLETIONOFACTIVITYININSTANCEBASEDSTATECHARTS,ITUSUALLYSIGNIFIESTHATTHATTHEINSTANCECEASESTOEXISTATTHISPOINTFINALSTATESCANNOTHAVEOUTGOINGTRANSITIONSFROMITDIAGRAMMATICALLYITISREPRESENTEDASABULLSEYEIVINITIALSTATEISASTATEINWHICHANOBJECTSPENDSNOTIMEDIAGRAMMATICALLYITISREPRESENTEDASABLACKDOTINITIALSTATEISATYPEOFPSEUDOSTATEAPSEUDOSTATEISANABSTRACTIONUSEDTOREPRESENTTRANSIENTSTATESPSEUDOSTATESAREUSUALLYUSEDTOCONNECTCOMPLEXTRANSITIONSTHERECANBEATMOSTONEINITIALSTATEINACOMPOSITESTATEVDEEPHISTORYSTATEAPSEUDOSTATE,ISUSEDTOREPRESENTTHELASTKNOWNACTIVESTATECONFIGURATIONOFTHECOMPOSITESTATETHATCONTAINSTHEHISTORYSTATEDEEPHISTORYISREPRESENTEDDIAGRAMMATICALLYASACIRCLEWITHAN“H”SYMBOLWITHINITDEEPHISTORYIMPLIESTHEACTIVESTATECONFIGURATIONFORALLLEVELSOFTHESTATECONFIGURATIONUNDERNEATHTHECOMPOSITESTATEARESAVEDWHENTHECOMPOSITESTATEISEXITEDANDRESTOREDWHENTHECOMPOSITESTATEISREENTEREDIFNOHISTORYEXITSIETHECOMPOSITESTATEISENTEREDFORTHEVERYFIRSTTIME,ADEFAULTTRANSITIONISTAKENTHISDEFAULTTRANSITIONISDIAGRAMMATICALLYREPRESENTEDASANOUTGOINGTRANSITIONFROMTHEHISTORYSTATETOASIMPLEORCOMPOSITESTATEDEEPHISTORYISONLYAPPLICABLEWITHINCOMPOSITESTATESANDTHERECANBEATMOSTONEHISTORYSTATEPERCOMPOSITESTATEVISHALLOWHISTORYSTATEAPSEUDOSTATE,ISUSEDTOREPRESENTTHELASTKNOWNACTIVESTATECONFIGURATIONOFTHECOMPOSITESTATETHATCONTAINSTHEHISTORYSTATESHALLOWHISTORYISREPRESENTEDDIAGRAMMATICALLYASACIRCLEWITHAN“H”SYMBOLWITHINITSHALLOWHISTORYIMPLIESTHEACTIVESTATECONFIGURATIONFORONLYTHEFIRSTLEVELOFTHESTATECONFIGURATIONUNDERNEATHTHECOMPOSITESTATEISSAVEDWHENTHECOMPOSITESTATEISEXITEDANDRESTOREDWHENTHECOMPOSITESTATEISREENTEREDIFNOHISTORYEXITSIETHECOMPOSITESTATEISENTEREDFORTHEVERYFIRSTTIME,ADEFAULTTRANSITIONISTAKENTHISDEFAULTTRANSITIONISDIAGRAMMATICALLYREPRESENTEDASANOUTGOINGTRANSITIONFROMTHEHISTORYSTATETOASIMPLEORCOMPOSITESTATESHALLOWHISTORYISONLYAPPLICABLEWITHINCOMPOSITESTATESANDTHERECANBEATMOSTONEHISTORYSTATEPERCOMPOSITESTATEVIISYNCHSTATESYNCHSTATEISUSEDTOSYNCHRONIZECONCURRENTSTATESSYNCHSTATESAREUSEDTOENSURETHATTRANSITIONSTOATARGETSTATEOUTOFCONCURRENTSTATESORREGIONSTHATARESYNCHRONIZEDDONOTOCCURUNTILALLTHEOUTGOINGTRANSITIONSFROMTHESYNCHRONIZEDCONCURRENTSTATESARETRIGGEREDWHENTHISCONDITIONISSATISFIED,THETRANSITIONTOTHETARGETSTATEISTRIGGEREDAUTOMATICALLYSYNCHSTATESAREONLYAPPLICABLETOCOMPOSITECONCURRENTSTATESSIMPLEANDCOMPOSITESTATESCANHAVEACTIONSORPROCEDURESASSOCIATEDWITHTHEMACTIONSAREPERFORMEDASARESULTOFSTATEENTRYOREXITTHESEACTIONSAREOPTIONALINTHESPECIFICATIONSTHEREARE3KINDSOFSTATEACTIONSDEFINEDWITHINTHEUMLMODELTHESEAREASFOLLOWSIENTRYACTIONANACTIONTHATISPERFORMEDWHENASTATEISENTEREDITISPERFORMEDPRIORTOANYOTHERACTIONWITHINTHESTATETHEACTIONISPERFORMEDREGARDLESSOFTHETRANSITIONTHATTRIGGEREDTHEENTRYINTOTHESTATEIIDOACTIVITYACTIONANACTIONTHATISPERFORMEDWHILETHESTATEISACTIVETHEACTIONISTERMINATEDWHENTHESTATEISEXITEDIIIEXITACTIONANACTIONTHATISPERFORMEDWHENASTATEISEXITEDTHEACTIONISPERFORMEDREGARDLESSOFTHETRANSITIONTHATTRIGGEREDEXITFROMTHESTATETHEEXITACTIONISTHEVERYLASTACTIONPERFORMEDPRIORTOEXITFROMASTATEEVENTSANEVENTISDEFINEDASANABSTRACTIONOFANINCIDENTORSIGNALINTHEREALWORLDTHATCAUSESACHANGEINSTATEGENERATIONOFEVENTSRESULTSINTRANSITIONSEVENTSMAYHAVESUPPLEMENTALDATAPARAMETERSASSOCIATEDWITHITTHEREARE4TYPESOFEVENTSDEFINEDINTHEUMLMODELTHESEAREICHANGEEVENTMODELSANEVENTTHATOCCURSWHENANEXPLICITBOOLEANEXPRESSIONBECOMESTRUECHANGEEVENTSAREALSOCALLEDPREDICATEORBOOLEANEVENTSITUSUALLYINDICATESACHANGEINOBJECTATTRIBUTEVALUEORASSOCIATIONCHANGEEVENTSAREEXPRESSEDSYNTACTICALLYUSINGWHENBOOLEANEXPRESSIONTHESTATEMACHINERAISESCHANGEEVENTSIMPLICITLYIITIMEEVENTMODELSTHEEXPIRATIONOFATIMEDEADLINETIMEEVENTSAREEXPRESSEDSYNTACTICALLYUSINGAFTERTIMEPERIODTHETIMEPERIODSTARTSWHENTHESTATEMACHINEENTERSASTATETHATHASANOUTGOINGTIMEEVENTDEFINEDFROMITTHESTATEMACHINERAISESTIMEEVENTSIMPLICITLYONCETHETIMEPERIODEXPIRESTHETIMEEVENTEVALUATIONISCANCELLEDIFTHESTATEMACHINECHANGESITSSTATEIIISIGNALEVENTMODELSTHEOCCURRENCEOFANINCIDENTINTHEREALWORLDSIGNALSAREASYNCHRONOUSINNATUREOBJECTSUSESIGNALSTOCOMMUNICATEWITHOTHEROBJECTSASIGNALISABSTRACTEDASASIGNALEVENTIVCALLEVENTMODELSASYNCHRONOUSEVENTTHATTRIGGERSASPECIFICOPERATIONONTHERECIPIENTOBJECTSSTATEMACHINETWOCASESOFCALLEVENTSARECREATIONANDDELETIONEVENTSANEVENTCANBEDEFERREDINASTATEADEFERREDEVENTISONETHATDOESNOTCAUSEATRANSITIONINTHECURRENTSTATEDEFERREDEVENTSSTAYONTHESTATEMACHINESEVENTQUEUEUNTILTHEEVENTISNOTDEFERREDANYMOREINWHICHCASEITSTHROWNAWAYORUNTILTHEEVENTCAUSESATRANSITIONTRANSITIONSATRANSITIONISCHANGEINTHECURRENTSTATECONFIGURATIONFROMASOURCESTATETOADESTINATIONSTATETHESOURCEAND/ORDESTINATIONSTATESCOULDBEPSEUDOSTATESATRANSITIONISTRIGGEREDASARESULTOFANEVENTTHERECANBEATMOSTONEEVENTTHATTRIGGERSAPARTICULARTRANSITIONTRANSITIONSCANHAVEGUARDSASSOCIATEDWITHTHEMOPTIONALAGUARDISABOOLEANEXPRESSIONIFAGUARDISSPECIFIED,THETRANSITIONISONLYTAKENIFTHEBOOLEANEXPRESSIONEVALUATESTOTRUEATTHETIMETHEEVENTISTRIGGEREDTRANSITIONSCANALSOHAVEOPTIONALACTIONS/PROCEDURESASSOCIATEDWITHTHEMTHESEARECALLEDTRANSITIONACTIONSIFANACTIONISSPECIFIED,THEACTIONISEXECUTEDDURINGTHETRANSITIONASPARTOFTHEZOOMFSMFRAMEWORK,ANEXTENSIONWASADDEDTOTHETRANSITIONBEHAVIORINUMLTHEFRAMEWORKADDEDSUPPORTFORTHECONCEPTOFTRANSITIONPRIORITYTRANSITIONPRIORITYISUSEDTOSELECTBETWEENMULTIPLEEVENTSONANOBJECTSEVENTQUEUETHATCOULDPOTENTIALLYCAUSEATRANSITIONTRANSITIONPRIORITYISSPECIFIEDASANINTEGERVALUETHEFOLLOWINGUMLSTATECHARTDIAGRAMSSHOWTHECONCEPTSDESCRIBEDABOVEFIGURE4EXAMPLEOFAUMLSTATECHARTFIGURE5EXAMPLEOFUMLSTATECHARTSTATEENTRYRULESSTATEENTRYRULESVARYDEPENDINGONTHETYPEOFTHEDESTINATIONSTATETHESTATEENTRYRULESFORTHEVARIOUSSTATESTYPESAREDESCRIBEDBELOWISIMPLESTATESFORSIMPLESTATES,THEREISONLYONEFORMOFSTATEENTRYITISCALLEDDEFAULTENTRYDEFAULTENTRYISALSOIMPLIEDWHENTRANSITIONINGFROMANINITIALSTATEPSEUDOSTATETOANYSTATEDURINGSTATEENTRYTHEENTRYACTIONOFTHESIMPLESTATEISEXECUTEDIINONCONCURRENTCOMPOSITESTATESFOUR4FORMSOFSTATEENTRYEXISTTHESEAREDEFAULTENTRY,EXPLICITENTRY,SHALLOWHISTORYENTRYANDDEEPHISTORYENTRYINDEFAULTENTRY,THEINCOMINGTRANSITIONSTOPSATACOMPOSITESTATEDURINGSTATEENTRY,THEENTRYACTIONOFTHECOMPOSITESTATEISEXECUTEDINEXPLICITENTRY,THEINCOMINGTRANSITIONSTOPSATASUBSTATECONTAINEDWITHINTHECOMPOSITESTATEINTHISCASE,THEENTRYACTIONOFTHECOMPOSITESTATEISCALLEDBEFORETHEENTRYACTIONOFTHESUBSTATEINSHALLOWHISTORYENTRY,THEINCOMINGTRANSITIONSTOPSATASHALLOWHISTORYSTATECONTAINEDWITHINTHECOMPOSITESTATEINTHISCASE,THESAVEDPREVIOUSACTIVESTATECONFIGURATIONIFAN
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