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A Synthesis-based Approach to Transformations in an MDA Software Development Process

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Synthesis-based Software Development Applied to MDA Transformations; Example: Transforming UML class models to XML schemas; ... Inextensible (InExts) ... – PowerPoint PPT presentation

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Title: A Synthesis-based Approach to Transformations in an MDA Software Development Process


1
  • A Synthesis-based Approach to Transformations in
    an MDA Software Development Process
  • Ivan Kurtev, Klaas van den Berg
  • University of Twente

2
Outline
  • Alternative Transformations in MDA
  • Synthesis-based Software Development Applied to
    MDA Transformations
  • Example Transforming UML class models to XML
    schemas
  • Alternative Space Analysis Activity
  • Construction of Transformation Space
  • Reduction of Transformation Space

3
Basic MDA Concepts
  • Models
  • CIM, PIM, PSM
  • Transformations
  • The MDA Pattern (from MDA Guide)

4
Alternatives in MDA Transformations
5
Example UML to XML Schema Transformation
6
The Problem with AlternativesGeneration and
Selection
  • Problem 1 Lack of support for identification of
    alternative transformations
  • Transformation to the desired model may not
    always be obvious and trivial
  • Problem 2 Selection among Alternatives
  • Alternatives differ in their Quality properties
    such as Extensibility, Adaptability, Performance
  • Alternative Transformations Analysis must be
    addressed explicitly in the MDA software
    development process!

7
Alternatives Analysis in Current Software
Development Processes RUP
8
RUP Analysis and Design Workflow
9
RUP Activities, Steps and Artifacts
10
Synthesis-based SoftwareDevelopment Process
  • Unified Process does not address the alternatives
    analysis problem
  • Synthesis-based Software Development Process
  • Activities in Synthesis-based Process
  • Technical Problem Analysis
  • Solution Domain Analysis
  • Alternative Space Analysis
  • We focus on the third activity Alternative Space
    Analysis

11
MDA Transformational Problem
12
Example
UML Source Model
We aim at deriving an Extensible XML schema. New
specializations of ExamItem are expected.
13
Two of many Alternative XML Schemas
ltelement nameexamItemgt ltcomplexTypegt
ltchoicegt ltelement nameopen
type/gt ltelement namemutipleChoice
type/gt lt/choicegt lt/complexTypegt lt/elem
entgt
ltelement nameexamItem
typeexamItemType
abstracttrue/gt .. lt/complexTypegt ltco
mplexType namemultipleChoiceTypegt
ltcomplexContentgt ltextension
baseexamItemTypegt .
lt/extensiongt lt/complexContentgt lt/complexTypegt lt
element namemultipleChoice
typemultipleChoiceType
substitutionGroupexamItem/gt
14
Alternative Space Analysis as part ofthe
Synthesis Process
Alternative Space Analysis Activity
Workflow of the Alternative Space Analysis
Activity
15
Step 1 Constructing Transformation Space
  • Set of dimensions one dimension for every
    (relevant) element from the source model
  • A coordinate set for every dimension

CT Complex Type E Element MG Model Group AG
Attribute Group Der Derivation Subst
Substitution Cont Containment Ref
Reference (Derived from XML Schema Meta-model)
4 x 4 x 580 alternatives
16
Step 2 Reducing Transformation Space
after selection
after exclusion
(ExamItem.E or ExamItem.CT) and (Open.E or
Open.CT)
ExamItem_Open.E or ExamItem_Open.Ref
12 alternatives
20 alternatives
17
Step 3 Reducing Transformation Space based
onQuality Requirements
  • In this example the Quality Model is the model of
    Extensibility
  • Model elements are
  • Extensible (Exts)
  • Inextensible (InExts)
  • Our technique allows merging of quality
    properties with a transformation space

18
Set of Alternative Transformations
  • After applying some reduction steps and taking
    into account the quality properties, two
    alternative transformations from the space are
    selected

Dimension
N ExamItem Open ExamItem_Open
1 E E E Subst
2 E E CT Der
Alternative Transformation
Coordinate
19
Conclusions
  • We presented an Activity of Alternative Space
    Analysis as a part of Synthesis-based Software
    Development Process for MDA transformations
  • Transformation Space
  • Is NOT a transformer
  • Is NOT a transformation specification
  • Not all alternatives in the Transformation Space
    are explicitly generated

20
Future Work
  • Study the full synthesis-based process
  • Experiments with more complex mappings (not only
    11 as in the example)
  • Experiments with more complex quality models
  • Tool support
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