Presentations text content in The Orchestra of
Slide1
The Orchestra ofMultiple Model Repositories
Sergejs Kozlovičssergejs.kozlovics@lumii.lv
Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide2The ``Orchestra'' Metaphor
Orchestra:multiple musical instrumentsplaying simultaneously
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide3The ``Orchestra'' Metaphor
Orchestra:multiple musical instrumentsplaying simultaneously multiple model repositoriesaccessed simultaneously(inter-repository links are possible)
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide4The ``Orchestra'' Metaphor
Orchestra:multiple musical instrumentsplaying simultaneously multiple model repositoriesaccessed simultaneously(inter-repository links are possible)
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide5Meta-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)
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
The "Gödel, Escher, Bach" book
by Douglas Hofstadter
Slide6MOF Meta-Levels (Linguistic)
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide7002
Research Laboratory of Modeling and Software Technologies
Institute 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)
Slide8The 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.
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide9MOF Meta-Levels (Linguistic)
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
UML metamodel
UML model
MOF
conforms to
conforms to
conforms to
Slide10Technical Spaces(I. Kurtev, J. Bézivin, and M. Aksit; 2002, 2005)
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Research Laboratory of Modeling and Software Technologies
Institute 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
Slide11Technical Spaces (cont.)(I. Kurtev, J. Bézivin, and M. Aksit; 2002, 2005)
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Research Laboratory of Modeling and Software Technologies
Institute 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
Slide12Why different technical spaces?
One TS can be more suitable than anotherReusing skills and knowledge of a familiar TSA capability not available in a desired TS can be borrowed from another TS
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide13TS interoperability
Offline solution: using projectors and extractors (B´ezivin et al.)“Online” (On-the-fly) solution: this paper!No deep copying of the data is required!
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide14Problem 1: Numerous different repositories
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
See Table 1 in the paper!
Slide15Repositories
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Research Laboratory of Modeling and Software Technologies
Institute 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
...
Slide16Repositories
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
The solution is a univeral Repository Access API, RAAPI
t
da.lumii.lv/raapi.html
Slide17Problem 2: Ontological meta-levels
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide18Ontological meta-levels
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide19Meta-Levels (Ontological)
A meta-metamodel that supports infinitely many ontological meta-levels (used by the JR repository):
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide20Meta-Levels (Ontological)
A meta-metamodel that supports infinitely many ontological meta-levels (used by the JR repository):
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide21Meta-Levels (Ontological)
OWL Full also supports infinitely many ontological meta-levels.
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide22Shostaks' 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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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide23Shostaks' 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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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Agris Šostaks
a
t SOFSEM 2012
Slide24We 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)
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Dealing with Šostaks' conjecture
Slide25Dealing with Šostaks' conjecture
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Research Laboratory of Modeling and Software Technologies
Institute 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.
Slide26The 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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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide27Kernel Metamodel (the essence)
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide28RAAPI 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.
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide29Organizing repositories
Unix file system directory tree:/boot/bin/mnt /mnt/c /mnt/d/media /media/cdrom/etc
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
m
ount points
Slide30Organizing repositories
Package tree (~ UML package tree):Package1Package2Package2::SubPackagePackage3Package4Use “MountPoint::ClassName” to access a class in a mounted repository
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
m
ount points
Slide31Organizing repositories
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Pivot
Root
package
P1
P2
Slide32Organizing repositories
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Pivot
Root
package
P1
P2
New repository
SubP
Slide33002
Research Laboratory of Modeling and Software Technologies
Institute 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.
Slide34Virtual repositories
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Pivot
Root
package
P1
P2
Virtual repository
SubP
Relies on data from somewhere else
(or, invents data)
Slide35Virtual repositories
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Pivot
Root
package
P1
P2
Virtual repository
SubP
Relies on data from somewhere else
Slide36Virtual repositories
002
Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Pivot
Root
package
P1
P2
Virtual repository
SubP
Relies on data from somewhere else
On-the-fly
m
odel
transformation
Slide37Use cases for virtual repositories
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Slide38Views on metamodels
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Pivot
Root
package
P1
P2
Virtual repository
SubP
View
Base
metamodel
Slide39Volatile repository
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
Pivot
Root
package
P1
P2
Virtual repository
(stores its content
In RAM)
SubP
Volatile
repository
Slide40Virtual merge
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
P
Q
Slide41Virtual merge
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
P
Virtual repository
i
mplementing
“merge”
Q
P
Slide42Derived (calculated) associations and properties
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
A
B
Slide43Derived (calculated) associations and properties
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
A
B
A
B
Virtual repository
c
omputes
the association
Slide44Derived (calculated) associations and properties
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
A
B
A
B
Virtual repository
c
omputes
the association
Finally, we just need to virtually merge these two packages!
merge
Slide45Virtual copy
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
P
Slide46Virtual copy
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
P
Virtual
repository
2
P’
P
(old data)
Virtual
repository
1
Slide47Virtual copy
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Research Laboratory of Modeling and Software Technologies
Institute of Mathematics and Computer Science, University of Latvia
P
Virtual
repository
2
P’
P
(old data)
Virtual
repository
1
Δ
2
Δ
1
Slide48
The Orchestra of
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