The document discusses MoDisco, a model-driven platform for modernizing legacy software systems. It can discover models from various legacy technologies like Java source code and databases. These models can then be understood, transformed, and used to generate documentation, metrics, and code for a new system. MoDisco uses a metamodeling approach and supports technologies like Java through customizable discovery, modeling, and transformation tools.

1. How to Deal With Your IT Legacy?
Reverse Engineering with MoDisco...
Hugo Brunelière INRIA / AtlanMod team
Frédéric Madiot Mia-Software
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2. Overview
a Model-Driven platform
for Software Modernization projects
Support multiple Support multiple
Legacy Technologies Support multiple Outputs
Modernization Scenarios
Source code Metrics
Databases • Quality Assurance Models
• Understanding
• Refactoring
Configuration • Technical Migration
files New system
Other sources Documentation
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3. Approach
Models to represent and manipulate
artifacts of existing systems
Existing
Software System
Discover Understand Transform
Software artifacts : New
- source code Models Viewpoints
Software System
- configuration files
- tests
- database
-…
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4. Architecture
Supported Technologies
Java XML ...
Metamodel Metamodel
Discoverer Discoverer
Generator
Discovery Model Customization
Manager Browser & Extensibility
Plug and orchestrate Navigation Definition of
artifacts through specific
transformators complex models Viewpoints
Infrastructure
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5. Legacy applications in Java ?
From the moment one writes a line of code, it becomes
legacy, and that legacy accumulates (Grady Booch)
– Samples
• LinkedIn > 1M lines of java code
• Texas Health (TIERS application) > 2.5M lines of java code
• CruiseControl > 5M lines of java code
• Eclipse (Galileo) > 24M lines of java code
• SAP (NetWeaver) > 24M lines of java code (255k classes)
– Continuous evolution
• JDK versions x Frameworks x Design Patterns
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6. Complex models ?
Java metamodel :
Example :
-126 types
-173 references Java model of draw2d :
- org.eclipse.draw2d
- org.eclipse.draw2d.tests
447 Java classes  144 374 nodes !
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7. MoDisco Demo
java.ecore
MoDisco
Java
conforms to
Discoverer
draw2d
draw2d java EMF model
Java source code
Demo
Models
MoDisco
ModelBrowser
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8. Find Patterns in your Models !
Define and dynamically plug
your own Example
Facets & UI Customizations
Decorate the Java model of
org.eclipse.draw2d.tests
To highlight JUnit patterns:
-Test suite
-Test case
-Test
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9. MoDisco Demo
java.ecore
customizes
conforms to
draw2d
java EMF model
JUnit3
Customization
Demo
MoDisco
ModelBrowser
Models
uses
JUnit3
Queries
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10. MoDisco Demo
Query
Java OCL ATL XPath
query query query ...
query
EMFQuery
query
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11. MoDisco Demo
java.ecore
customizes extends
conforms to
draw2d
java EMF model
JUnit3 JUnit3
Customization Facets
MoDisco
ModelBrowser
Models Demo
uses uses
JUnit3
Queries
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12. MoDisco Demo
java.ecore testsuite.ecore
extends
conforms to conforms to
draw2d draw2d
java EMF model testsuite EMF model
JUnit3 uses
Facets
Models
uses
MoDisco
JUnit3
Queries
Demo ModelBrowser
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13. Transform and Regenerate …
Example : from JUnit3 to JUnit4
superClass
ClassDeclaration
ClassDeclaration junit.framework.TestCase
RayTest importedElement
ImportDeclaration
imports
MoDisco MethodDeclaration
Java bodyDeclarations test_length()
Discoverer
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14. Transform and Regenerate …
Example : from JUnit3 to JUnit4
superClass
ClassDeclaration
ClassDeclaration junit.framework.TestCase
RayTest importedElement
ImportDeclaration
imports
MoDisco MethodDeclaration
Java bodyDeclarations test_length()
Discoverer
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15. Transform and Regenerate …
Example : from JUnit3 to JUnit4
ClassDeclaration
RayTest
MoDisco MethodDeclaration
Java bodyDeclarations test_length()
Discoverer
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16. Transform and Regenerate …
Example : from JUnit3 to JUnit4
ClassDeclaration ClassDeclaration
RayTest org.junit.Test
type
annotations Annotation
MoDisco MethodDeclaration
Java bodyDeclarations test_length()
Discoverer
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17. Transform and Regenerate …
Example : from JUnit3 to JUnit4
ClassDeclaration ClassDeclaration
RayTest org.junit.Test
type
ImportDeclaration
imports
annotations Annotation
MoDisco MethodDeclaration
Java bodyDeclarations test_length()
Discoverer
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18. Transform and Regenerate …
Example : from JUnit3 to JUnit4
ClassDeclaration ClassDeclaration
RayTest org.junit.Test
type
ImportDeclaration
imports
Annotation
MoDisco
annotations
MoDisco
MethodDeclaration
Java Java
bodyDeclarations test_length()
Discoverer Generator
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19. Who is involved in MoDisco ?
• The MoDisco team
– 6 committers
• 1 from INRIA
• 5 from Mia-Software
– Several regular active contributors
• Supported by the OMG (ADM TF)
– Reference implementations of standards from the
– Architecture Driven Modernization Task Force
• KDM (Knowledge Discovery Metamodel)
• SMM (Software Metrics Metamodel)
• Supported by the European Commission
– Project initiated by INRIA in the context of
– the MODELPLEX IST-FP6 European Project
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20. MoDisco
Questions ?
www.eclipse.org/gmt/modisco
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