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# Finding the Pattern You Need: The Design Pattern Intent Ontology - PowerPoint PPT Presentation

Finding the Pattern You Need: The Design Pattern Intent Ontology. Holger Kampffmeyer, Steffen Zschaler Technische Universität Dresden, Germany 04 October, 2007. Outline. Motivation Modelling Design-Pattern Intent Searching for Patterns Conclusions. Software Developer with Design Problem.

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### Finding the Pattern You Need:The Design Pattern Intent Ontology

Holger Kampffmeyer, Steffen Zschaler

Technische Universität Dresden, Germany

04 October, 2007

• Motivation

• Modelling Design-Pattern Intent

• Searching for Patterns

• Conclusions

(c) Steffen Zschaler

Design Problem

Motivation

But:

Which Pattern

Fits?

Design

Patterns

How to solve?

(c) Steffen Zschaler

• Pattern catalogues:

• Rough categorisation

• No tool support

 Useful for small collections of patterns only

2. Formal representations of patterns:

• Good for tool-supported search

• Focus on structure and behaviour

• Developers need to search by problem

• Problems solved by a pattern are described in Intent (mainly)

 Need a searchable formalisation of pattern Intent

(c) Steffen Zschaler

solves

*

DPProblem

decouples

AlgorithmDecoupling

Algorithm

Modelling Design-Pattern Intent

*

DPProblem

ProblemConcept

Constraint

(c) Steffen Zschaler

Modelling Design-Pattern Intent (2)Problem Hierarchy

• Based on Intent descriptions from GoF catalogue

(c) Steffen Zschaler

*

*

DesignPattern

DPProblem

ProblemConcept

Constraint

Modelling Design-Pattern Intent (3)Ontologies

• Ontologies allow easy expression of knowledge bases

• Queries executed by Reasoning Engines

• “Find all instances of DesignPattern that are a solution to a problem where an algorithm is varied.”

(retrieve (?x )

(and (?x |DesignPattern|)

(?x ?p |isSolutionTo|)

(?p ?a |varies|)

(?a |Algortihm|)

))

nRQL

(c) Steffen Zschaler

(c) Steffen Zschaler

• Presented a new approach to formalise Design Patterns

• Based on pattern intent

• Useful for looking up a pattern to solve a design problem

Future work

• Represent more design patterns

• User study with wizard

• Is this the right representation of design problems?

(c) Steffen Zschaler

• Thank you for your attention!

• Questions welcome!

(c) Steffen Zschaler