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The Orchestra ofMultiple Model Repositories
Sergejs Kozlovič[email protected]
Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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The ``Orchestra'' Metaphor
Orchestra:
• multiple musical instruments
• playing simultaneously
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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The ``Orchestra'' Metaphor
Orchestra:
• multiple musical instruments
• playing simultaneously
• multiple model repositories
• accessed simultaneously(inter-repository links are possible)
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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The ``Orchestra'' Metaphor
Orchestra:
• multiple musical instruments
• playing simultaneously
• multiple model repositories
• accessed simultaneously(inter-repository links are possible)
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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Meta-s* a publication
* a newspaper
* The San Francisco Chronicle
* the May 18 edition of the
The San Francisco Chronicle
* my copy of the May 18 edition of the
The San Francisco Chronicle * my copy of the May 18 edition of the
The San Francisco Chronicle as it was when
I first picked it up (as contrasted with my copy as it
was a few days later: in my fireplace, burning)002Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
The "Gödel, Escher, Bach" book
by Douglas Hofstadter
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MOF Meta-Levels (Linguistic)
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
Artifacts are organized into three layers:
• the meta-metamodel;
• metamodels conforming to the meta-metamodel;
• models conforming to some particular metamodel.
The Three-Level Conjecture(I. Kurtev and J. Bézivin)
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The Three-Level Conjecture(I. Kurtev and J. Bézivin, 2005)
Artifacts are organized into three layers:
• the meta-metamodel;
• metamodels conforming to the meta-metamodel;
• models conforming to some particular metamodel.
The meta-metamodel is able to describe itself.
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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MOF Meta-Levels (Linguistic)
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
UML metamodel
UML model
MOF
conforms to
conforms to
conforms to
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Technical Spaces(I. Kurtev, J. Bézivin, and M. Aksit; 2002, 2005)
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
UML metamodel
UML model
MOF
conforms to
conforms to
conforms to
MOF TS
OWL classes
OWL individuals
OWL DL
conforms to
conforms to
conforms to
RDF/OWL TS
ER-model (DB schema)
DB rows
DB system tables
conforms to
conforms to
conforms to
Relational DB TS
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Technical Spaces (cont.)(I. Kurtev, J. Bézivin, and M. Aksit; 2002, 2005)
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
XML schema(.xsd)
XML document
XML metaschema
(XSD.xsd)
conforms to
conforms to
conforms to
XML TS
Java grammar
Java program
BNF
conforms to
conforms to
conforms to
Grammarware TS
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Why different technical spaces?
• One TS can be more suitable than another
• Reusing skills and knowledge of a familiar TS
• A capability not available in a desired TS can be borrowed from another TS
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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TS interoperability
• Offline solution: using projectors and extractors (B´ezivin et al.)
• “Online” (On-the-fly) solution: this paper!o No deep copying of the data is required!
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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Problem 1: Numerous different repositories
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
See Table 1 in the paper!
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Repositories
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
See Table 1 in the paper!
MOF TS:• EMF• CDO• MDR (NetBeans)• Enchanced Model
Repository• MetaMart Metadata
Repository• JR• ...
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Repositories
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
The solution is a univeral Repository Access API, RAAPI• tda.lumii.lv/raapi.html
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Problem 2: Ontological meta-levels
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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Ontological meta-levels
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Meta-Levels (Ontological)
A meta-metamodel that supports infinitely many ontological meta-levels (used by the JR repository):
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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Meta-Levels (Ontological)
A meta-metamodel that supports infinitely many ontological meta-levels (used by the JR repository):
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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Meta-Levels (Ontological)
OWL Full also supports infinitely many ontological meta-levels.
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Shostaks' conjecture
It is difficult for a human to think at more than two meta-levels at a time.
Still, it is pretty easy for a human to focus on any two adjacent meta-levels.
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Shostaks' conjecture
It is difficult for a human to think at more than two meta-levels at a time.
Still, it is pretty easy for a human to focus on any two adjacent meta-levels.
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
Agris Šostaksat SOFSEM 2012
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We divide the repository into two parts:
• M3 contating the meta-metamodel;
fixed for a particular repository/technical space;
• all other data (either M2+M1 or multiple ontological meta-levels)
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
Dealing with Šostaks' conjecture
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Dealing with Šostaks' conjecture
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
• RAAPI is designed to work with any two adjacent meta-levels• Switching between levels and mixing them is possible by, e.g.,
passing a reference to a class when a reference to an object is expected.
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The Idea
• The kernel represents all repositories as one big virtual repository.
• The kernel substitutes native references (integers) of each repository by globally unique proxy references.
• Inter-repository links are stored in the pivot repository.
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Kernel Metamodel (the essence)
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
ProxyReferencedomesticReference:int64proxyReference:int64
Kernel
Repositoryurl:string
InterDirectedLink InterAttributeValuevalue:string
InterDirectedAssociationtargetRole:stringtargetCardinality:stringisComposition:Boolean
PackagesimpleName:stringnameInRepo:string
0..1 mounted Repository
1 mountPoint
1
pivot Repository
outgoingLinktarget Object
ingoingLink
source Object
0..1inverse
asso- cia- tion object
value
attribute
interSuperClass
interSubClass
outgoing Association
sourceClass1
ingoing Association
1 targetClass
0..1
inverse
0..1parent
*child
1
rootPackage
1associated Repository
1 *
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RAAPI call example: createLink()
createLink(obj1_ref, obj2_ref, association_ref);
• If all proxy references point to the same repository, the call is forwarded to this repository.
• Otherwise, an inter-repository link is created and stored in the pivot repository.
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
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Organizing repositories
• Unix file system directory tree:
/boot
/bin
/mnt
/mnt/c
/mnt/d
/media
/media/cdrom
/etc002Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
mount points
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Organizing repositories
• Package tree (~ UML package tree):
Package1
Package2
Package2::SubPackage
Package3
Package4
• Use “MountPoint::ClassName” to access a class in a mounted repository
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
mount points
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Organizing repositories
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
Pivot
Rootpackage
P1 P2
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Organizing repositories
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
Pivot
Rootpackage
P1 P2
New repositorySubP
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002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
Problem 3:Manipulating the packages
How to merge packages?
I.e., when working with class Package1::A, objects and properties of Package2::A are also taken into a consideration.
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Virtual repositories
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
Pivot
Rootpackage
P1 P2
Virtual repositorySubP
Relies on data from somewhere else (or, invents data)
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Virtual repositories
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
Pivot
Rootpackage
P1 P2
Virtual repositorySubP
Relies on data from somewhere else
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Virtual repositories
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
Pivot
Rootpackage
P1 P2
Virtual repositorySubP
Relies on data from somewhere else
On-the-flymodeltransformation
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Use cases for virtual repositories
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Views on metamodels
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
Pivot
Rootpackage
P1 P2
Virtual repositorySubP
View
Basemetamodel
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Volatile repository
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
Pivot
Rootpackage
P1 P2
Virtual repository(stores its content
In RAM)
SubP
Volatilerepository
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Virtual merge
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
P
Q
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Virtual merge
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
P
Virtual repositoryimplementing
“merge”
Q
P
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Derived (calculated) associations and properties
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
A B
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Derived (calculated) associations and properties
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
A B A B
Virtual repositorycomputes
the association
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Derived (calculated) associations and properties
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
A B A B
Virtual repositorycomputes
the association
Finally, we just need to virtually merge these two packages!
merge
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Virtual copy
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P
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Virtual copy
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
P Virtualrepository
2
P’
P(old data)
Virtualrepository
1
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Virtual copy
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
P Virtualrepository
2
P’
P(old data)
Virtualrepository
1
Δ2Δ1
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Thank you!Děkuji!
002Research Laboratory of Modeling and Software TechnologiesInstitute of Mathematics and Computer Science, University of Latvia
The Orchestra ofMultiple Model Repositories