partial loading of xmi models
TRANSCRIPT
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1
Par$alLoadingofXMIModels
RanWei,DimitrisKolovos,AntonioGarcia-Dominguez,Konstan9nosBarmpis,RichardPaige
UniversityofYork
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2
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3Outline
• Context:EMFandXMI• EMF'sXMIParser• Par9alXMILoading• Evalua9on&Limita9ons• Conclusions&FutureWork
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4Context
• EclipseModelingFramework(EMF)– De-factostandardforbuildingMDEtools
• OCL,Xtext,ATL,Epsilon,EMF-IncQuery,Acceleo,Xpand
• XMLMetadataInterchange(XMI)– Enablesmodelinteroperability– Supportedna9velybyEMFandasanimport/exportformatbymodelingtools• e.g.EnterpriseArchitect,Modelio,MagicDraw,MicrosoWVisio,VisualParadigm
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5TheProblem
• Modelmanagementopera9ons(valida9on,transforma9on,etc.)typicallyuseonlyasubsetoftheelementsofamodel
• EMF’sXMIparserneedstoloadtheen9remodelanyway– Wasteful(memory+9me)
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6varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
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7Alterna$vestoXMI
• Binarymodelserialisa9on– Supportedna9velybyEMF– Smallerfilesandfaster– S9llrequiresfullloading
• Database-backedmodelpersistence– NeoEMF,CDO,Morsa,MongoEMF– Supportdynamicmodelelementloading/unloading– Notwidelysupportedbymodellingtools(yet)
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8Contribu$ons
• Apar9alXMIloadingalgorithm– Skipirrelevantmodelelements– Expectedmemoryandperformancebenefits
• Animplementa9onofthealgorithmasanextensiontoEMF'sXMIparser– Toavoidreinven9ngthewheel– Tofacilitateexploita9onbyEMF-basedmodelmanagementlanguagesandtools
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9EMF'sXMIParser
• Event-based(SAX)parser– startDocument,startElement,endElementetc.
• Keepstrackofitsposi9oninthemodelusingastackofmodelelements(EObjects)– Onstartelement:thetopoftheobjectstackisusedtodeterminewhatEObjecttocreate
– Onendelement:thetopoftheobjectstackisremoved
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10TheUniversityMetamodel
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11EMF'sXMIParser
ObjectStack
Resource
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12EMF'sXMIParser
ObjectStack :University
Resource:University
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13EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department
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14EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department:Lecturer
:Lecturer
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15EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department:Lecturer
:Lecturer
:WebPage
:WebPage
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16EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department:Lecturer
:Lecturer
:WebPage
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17EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department:Lecturer
:Lecturer
:WebPage
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18EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department
:Lecturer
:WebPage
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19EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department:Student
:Lecturer
:WebPage :Student
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20EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department
:Lecturer
:WebPage :Student
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21EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department:Module
:Lecturer
:WebPage :Student
:Module
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22EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department:Module
:Lecturer
:WebPage :Student
:Module
:WebPage:WebPage
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23EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department:Module
:Lecturer
:WebPage :Student
:Module
:WebPage
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24EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department:Department
:Lecturer
:WebPage :Student
:Module
:WebPage
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25EMF'sXMIParser
:University
ObjectStack :University
Resource
:Department
:Lecturer
:WebPage :Student
:Module
:WebPage
![Page 26: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/26.jpg)
26EMF'sXMIParser
ObjectStack :University
Resource
:Department
:Lecturer
:WebPage :Student
:Module
:WebPage
![Page 27: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/27.jpg)
27EMF'sXMIParser
ObjectStack :University
Resource
:Department
:Lecturer
:WebPage :Student
:Module
:WebPage
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28EMF'sXMIParser
• EveryXMIelementisprocessed• AllEObjectsneedtobecreated• Allaeribute/referenceslotsarepopulated
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29Par$alXMILoading
• Effec9veMetamodel(akafootprint)– Extractedfrommodelmanagementprograms– …sothatweknowwhattoloadfromamodel
• Par9alLoadingAlgorithm– ExtensionofEMF’sXMIparsingalgorithm– Usestheeffec9vemetamodelto
• SkipXMIelements• Avoidcrea9onofelementsthatarenotneeded• Avoidpopula9onofslotsthatarenotneeded
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30Effec$veM2Extrac$on
• Iden9fiestypes/featuresthatarelikelytobeaccessedduringtheexecu9onofamodelmanagementprogram– Extractsan"effec9vemetamodel"
• PrototypeforEpsilonbutapplicabletoanysta9callyanalysablelanguage
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31Effec$veM2Extrac$on
Effec9veMetamodel
Lecturer
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
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32Effec$veM2Extrac$on
Effec9veMetamodel
Lecturer
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 33: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/33.jpg)
33Effec$veM2Extrac$on
Effec9veMetamodel
Lecturer
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
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34Effec$veM2Extrac$on
Effec9veMetamodel
Lecturer
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 35: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/35.jpg)
35Effec$veM2Extrac$on
Effec9veMetamodel
Lecturer
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 36: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/36.jpg)
36Effec$veM2Extrac$on
Effec9veMetamodel
Lecturer
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 37: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/37.jpg)
37Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_name
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
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38Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_name
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 39: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/39.jpg)
39Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_name
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 40: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/40.jpg)
40Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_name
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 41: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/41.jpg)
41Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_name
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 42: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/42.jpg)
42Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_name
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 43: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/43.jpg)
43Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_namewebPage
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 44: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/44.jpg)
44Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_namewebPage
WebPage
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 45: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/45.jpg)
45Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_namewebPage
WebPageurl
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 46: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/46.jpg)
46Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_namewebPage
WebPageurl
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 47: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/47.jpg)
47Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_namewebPage
WebPageurl
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 48: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/48.jpg)
48Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_namewebPagemodules
WebPageurl
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 49: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/49.jpg)
49Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_namewebPagemodules
WebPageurl
Module
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 50: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/50.jpg)
50Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_namewebPagemodules
WebPageurl
Module
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 51: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/51.jpg)
51Effec$veM2Extrac$on
Effec9veMetamodel
Lecturerfirst_namelast_namewebPagemodules
WebPageurl
Module
varlecturers=Lecturer.allOfKind();for(linlecturers){
l.first_name.println();l.last_name.println();l.webPage.url.println();l.modules.size().println();
}
![Page 52: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/52.jpg)
52Effec$veM2Extrac$on
![Page 53: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/53.jpg)
53Effec$veM2Reconcilia$on
• Effec9vemetamodelsextractedfrommodelmanagementprogramsmaybeincomplete– Theyrequirereconcilia9on
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54Effec$veM2Reconcilia$on
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55Par$alLoadingAlgorithm
• Theen9redocumentiss9llreadbutonlyXMIelementsofelementsareprocessed
• Novelty:PlaceholderObjects– Theobjectstackisessen9altoEMF'sXMIloadingalgorithms
– Wecreateoneplaceholderobjectforeachirrelevanttypeanduseinintheplaceofignoredmodelelements
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56ReconciledEffec$veM2
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57Par$alXMILoading
ObjectStack
Resource
Placeholders
:University
:Department
:Student
![Page 58: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/58.jpg)
58Par$alXMILoading
:University
ObjectStack
Resource
Placeholders
:University
:Department
:Student
![Page 59: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/59.jpg)
59Par$alXMILoading
:University
ObjectStack
Resource
Placeholders
:University
:Department
:Student
:Department
![Page 60: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/60.jpg)
60Par$alXMILoading
:University
ObjectStack
Resource
Placeholders
:University
:Department
:Student
:Department
:Lecturer
![Page 61: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/61.jpg)
61Par$alXMILoading
:University
ObjectStack
Resource
Placeholders
:University
:Department
:Student
:Department
:Lecturer :Lecturer
![Page 62: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/62.jpg)
62Par$alXMILoading
:University
ObjectStack
Resource
Placeholders
:University
:Department
:Student
:Department
:Lecturer :Lecturer
:WebPage :WebPage
![Page 63: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/63.jpg)
63Par$alXMILoading
:University
ObjectStack
Resource
Placeholders
:University
:Department
:Student
:Department
:Lecturer :Lecturer
:WebPage :WebPage
![Page 64: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/64.jpg)
64Par$alXMILoading
:University
ObjectStack
Resource
Placeholders
:University
:Department
:Student
:Department
:Lecturer :Lecturer
:WebPage
![Page 65: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/65.jpg)
65Par$alXMILoading
:University
ObjectStack
Resource
Placeholders
:University
:Department
:Student
:Department
:Lecturer
:WebPage
![Page 66: Partial Loading of XMI Models](https://reader031.vdocument.in/reader031/viewer/2022030300/58818c481a28ab0d358b4771/html5/thumbnails/66.jpg)
66Par$alXMILoading
:University
ObjectStack
Resource
Placeholders
:University
:Department
:Student
:Department
:Lecturer
:WebPage
:Student
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67Par$alXMILoading
:University
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:University
:Department
:Student
:Department
:Lecturer
:WebPage
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68Par$alXMILoading
:University
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69Par$alXMILoading
:University
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:University
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70Par$alXMILoading
:University
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71Par$alXMILoading
:University
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:University
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72Par$alXMILoading
:University
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:University
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:Student
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73Par$alXMILoading
:University
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:University
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74Par$alXMILoading
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:University
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75Par$alXMILoading
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:University
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76Par$allyLoadedModel
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77Integra$onwithEMF
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78
Evalua$on_
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79Benchmarks
• ModelsfromGraBaTs2009• 5datasets– set0–set4,obtainedbyreverse-engineeringJavaprojects
– Sizes:9.2MB,27.9MB,283.2MB,626.7MBand676.9MB
• Benchmarkquerysets– EOLqueriesautoma9callygeneratedtoaccess20%,40%,60%,80%and100%ofalldatasets
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80BenchmarkResults:Set0
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81BenchmarkResults:Set1
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82BenchmarkResults:Set2
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83BenchmarkResults:Set3
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84BenchmarkResults:Set4
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85Observa$ons
• Linearbehaviourwithregardtothenumberofmodelelementsandslotsofinterest– Loading9me– Memoryfootprint
• Whenloading100%ofthemodel,thepar9alloadingalgorithmismarginallyslower
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86Limita$ons
• XMImodelsshoulduseuniqueIDsratherthanfragmentpathIDs– Suchas//@departments.0/@modules.0
• Par9allyloadedmodelsareread-only– Changescannotbesavedbacktotheoriginalmodel
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87Conclusions
• Firstaeempttopar9allyloadXMImodels• tosave9meandmemory
• AlgorithmimplementedasanextensiontoEMF'sXMIparser
• Scaleslinearlywithrespecttothenumberofmodelelementsandslotsofinterest
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88FutureWork
• Run9memodel-levelpruning– AvoidingXMLtagsanditschildrenifcompletelynotneeded
• Propaga9ngchangesbacktotheoriginalmodel
• Suppor9ngfragmentpathIDs• Par9alloadingofmodelsserialisedinEMF'sbinaryformat