o o.univ.-prof. di dr. wolfgang ... · refactoring sequence (v) slides are based on oo...
TRANSCRIPT
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O.Univ.-Prof. DI Dr. Wolfgang PreeUniversität Salzburg
www.SoftwareResearch.net
OOOOOOOO RRRReeeeeeeennnnggggiiiinnnneeeeeeeerrrriiiinnnngggg
PPPPaaaatttttttteeeerrrrnnnnssss
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 2
Introduction
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 3
Goals
Convince you about the following:
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 4
Lehman‘s laws
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What is a legacy system?
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 6
Software maintenance
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What about OO?
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 8
Definitions
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Reverse and reengineering
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Goals of reverse engineering
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Reverse engineering techniques
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 12
Goals of reengineering
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Reengineering techniques
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Architectural problems
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Refactoring opportunities
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Tool integration
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Tool integration—overview
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Why integrate tools?
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Which tools to integrate?
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Tool integration issues
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Basic tool architecture
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Help yourself approach
� build your own parser
� translate between file formats
� communicate via APIs
� collect execution traces
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Exchange standards
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Reference format
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Openness
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Meta models
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UML shortcomings
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Conclusion
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Design extraction
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extreme situation
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Goals
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What is ‘design‘?
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Why design extraction is needed?
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Small example—straighten UMLreverse engineered diagrams (I)
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Small example—straighten UMLreverse engineered diagrams (II)
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Small example—straighten UMLreverse engineered diagrams (III)
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Small example—straighten UMLreverse engineered diagrams (IV)
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Essential questions wheninterpreting UML
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Levels of interpretation: perspectives
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Attributes in perspectives
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Operations in perspectives
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Associations
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Associations—conceptual perspective
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Associations—specification perspective
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Arrows—navigability
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Generalization
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Need for a clearer mapping
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Meanings of ‘ private‘
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class method inheritance
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Stereotypes to extend UML
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Instance/class associations
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Association extractions (I)
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Association extractions (II)
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Operation extractions (I)
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Operation extractions (II)
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Design patterns as documentationelements?
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Evolution impact analysis: reuse contract
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Example
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Reuse contracts—general idea
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Example
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 61
Documenting dynamic behavior
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 62
UML sequence diagrams
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Implications
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Conclusions
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 65
Metrics for OOreengineering
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Outline
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 67
Why metrics in OO reengineering?
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Which metrics to collect?
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Assumptions
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Definitions
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Results: problem detection
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Results: stability assessment
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Results: reverse engineering
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Split into superclass/merge withsuperclass
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 75
Split into subclass/merge withsubclass
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Move to superclass/subclass or siblingclass
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Split method/factor commonfunctionality
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Conclusions
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Refactoring
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Outline
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Why refactoring?
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Iterative development life cycle
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What is refactoring?
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Which refactoring tools?
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Case study: Internet bankinginitial requirements
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Prototype design
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Prototype design of contracts
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Prototype implementation
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Prototype consolidation
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Expansion
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 91
Expanded design
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Expanded design: contracts
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Expanded implementation
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Consolidation: problem detection
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Consolidation: refactored classdiagram
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Refactoring sequence (I)
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Refactoring sequence (II)
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Refactoring sequence (III)
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Refactoring sequence (IV)
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Refactoring sequence (V)
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Tool support
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slides are based on OO Reengineering (Demeyer, Ducasse, Nierstrasz) 102
Conclusion (I)
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Conclusion (II)
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Bibliography
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Annotated biliography (I)
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Annotated biliography (II)
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Annotated biliography (III)
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References (I)
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References (II)
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References (III)
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References (IV)
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References (V)