The Orchestra of

Presentation on theme: "The Orchestra of"— Presentation transcript:

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 LatviaSlide2
The ``Orchestra'' Metaphor
Orchestra:multiple musical instrumentsplaying simultaneously
002
multiple model repositoriesaccessed simultaneously
(inter-repository links are possible)002
multiple model repositories
accessed simultaneously(inter-repository links are possible)
002
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)
002
Institute of Mathematics and Computer Science, University of Latvia
The "Gödel, Escher, Bach" book
by Douglas HofstadterSlide6
MOF Meta-Levels (Linguistic)
002
002
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)Slide8
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.
002
MOF Meta-Levels (Linguistic)
002
UML metamodel
UML model
MOF
conforms to
conforms to
conforms toSlide10
Technical Spaces(I. Kurtev, J. Bézivin, and M. Aksit; 2002, 2005)
002
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 TSSlide11
Technical Spaces (cont.)(I. Kurtev, J. Bézivin, and M. Aksit; 2002, 2005)
002
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 TSSlide12
Why 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
002
TS 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!
002
Problem 1: Numerous different repositories
002
See Table 1 in the paper!Slide15
Repositories
002
See Table 1 in the paper!
MOF TS:
EMF
CDO
MDR (NetBeans)
Enchanced Model Repository
MetaMart Metadata Repository
JR
...Slide16
Repositories
002
The solution is a univeral Repository Access API, RAAPI
t
da.lumii.lv/raapi.htmlSlide17
Problem 2: Ontological meta-levels
002
Ontological meta-levels
002
Meta-Levels (Ontological)
A meta-metamodel that supports infinitely many ontological meta-levels (used by the JR repository):002
A meta-metamodel that supports infinitely many ontological meta-levels (used by the JR repository):
002
OWL Full also supports infinitely many ontological meta-levels.002
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.
002
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.
002
Agris Šostaks
a
t SOFSEM 2012Slide24
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)
002
Dealing with Šostaks' conjectureSlide25
Dealing with Šostaks' conjecture
002
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.Slide26
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.
002
Kernel Metamodel (the essence)
002
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.
002
Organizing repositories
Unix file system directory tree:/boot/bin/mnt
/mnt/c /mnt/d/media
/media/cdrom/etc
002
m
ount pointsSlide30
Package tree (~ UML package tree):Package1Package2Package2::SubPackage
Package3Package4
Use “MountPoint::ClassName” to access
a class in a mounted repository
002
m
ount pointsSlide31
002
Pivot
Root
package
P1
P2Slide32
002
Pivot
Root
package
P1
P2
New repository
SubPSlide33
002
Problem 3:
M
anipulating 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.Slide34
Virtual repositories
002
Pivot
Root
package
P1
P2
Virtual repository
SubP
Relies on data from somewhere else
(or, invents data)Slide35
002
Pivot
Root
package
P1
P2
Virtual repository
SubP
Relies on data from somewhere elseSlide36
002
Pivot
Root
package
P1
P2
Virtual repository
SubP
Relies on data from somewhere else
On-the-fly
m
odel
transformationSlide37
Use cases for virtual repositories
002
Views on metamodels
002
Pivot
Root
package
P1
P2
Virtual repository
SubP
View
Base
metamodelSlide39
Volatile repository
002
Pivot
Root
package
P1
P2
Virtual repository
(stores its content
In RAM)
SubP
Volatile
repositorySlide40
Virtual merge
002
P
QSlide41
Virtual merge
002
P
Virtual repository
i
mplementing
“merge”
Q
PSlide42
Derived (calculated) associations and properties
002
A
BSlide43
002
A
B
A
B
Virtual repository
c
omputes
the associationSlide44
002
A
B
A
B
Virtual repository
c
omputes
the association
Finally, we just need to virtually merge these two packages!
mergeSlide45
Virtual copy
002
PSlide46
Virtual copy
002
P
Virtual
repository
2
P’
P
(old data)
Virtual
repository
1Slide47
Virtual copy
002
P
Virtual
repository
2
P’
P
(old data)
Virtual
repository
1
Δ
2
Δ
1Slide48

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