Tutorial 3 More on Design patterns Today… 1. The GOF Catalogue

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Tutorial 3 More on Design patterns Today… 1. The GOF Catalogue

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Spring 2005. ECE450H1S. Software Engineering II. Tutorial 3. More on Design patterns. Study Several Examples of. Design Patterns. Explain its relation to our ...

Last lecture… On design patterns

Tutorial 3 More on Design patterns Study Several Examples of Design Patterns Explain its relation to our course projects Spring 2005

ECE450H1S

Software Engineering II

• We explained what are patterns, what are design patterns • How are they categorized? • How to apply them? • How to identify them? • How to assess them?

Spring 2005

Today…

ECE450H1S

Software Engineering II

1. The GOF Catalogue

1. Design patterns structures Creational patterns Structural patterns Behavioural patterns 2. How are they related to each other? 3. Design patterns by examples Some special design in OpenOME 4. Their relation to your course project

• Creational Abstract Factory, Builder, Factory method, Prototype, Singleton • Structural Adapter, Bridge, Composite, Decorator, Façade, Flyweight, Proxy • Behavioural Chain of Responsibility, Command, Interpreter, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor

Spring 2005

Spring 2005

ECE450H1S

Software Engineering II

ECE450H1S

Software Engineering II

Bridge

Adapter Builder

Abstract Factory

Factory method

Singleton Spring 2005

ECE450H1S

Prototype

Composite

Software Engineering II

Spring 2005

Façade

ECE450H1S

Software Engineering II

Decorator

Command

Chain of Responsibility

Flyweight Proxy

Iterator

Interpreter Spring 2005

ECE450H1S

Software Engineering II

Spring 2005

ECE450H1S

Software Engineering II

Mediator Strategy Memento

Observer Spring 2005

State ECE450H1S

Software Engineering II

•Template Method Spring 2005

2. Relation among patterns

•Visitor ECE450H1S

Software Engineering II

A layered version

Ladan Tahvildari and Kostas Kontogiannis. “On the Role of Design Patterns in Quality-Driven Re-engineering” Spring 2005

ECE450H1S

Software Engineering II

Spring 2005

ECE450H1S

Software Engineering II

3. Some Special design patterns in our legacy software

3.1 MVC

1. MVC patterns classic design pattern from SmallTalk Most editors follows the pattern 2. Plugin patterns OpenOME, Protégé, Eclipse 3. Meta-modelling patterns Telos, EMF, UML, Protégé

Spring 2005

ECE450H1S

Software Engineering II

Spring 2005

3.2 Plugin patterns

ECE450H1S

Software Engineering II

3.2.1 OpenOME • AbstractPluginMethod.java – PluginMethod.java

System

• OMEPlugin.java – OMEDefaultPlugin.java A bunch of methods – Extended by …

AbstractPlugin attribute plugin_method()

• edu.toronto.cs.ome.plugins – – – –

Extension SubSystem ConcretePlugin

• Plugin is selected at run-time, depending on the input class.ForName( … )

attribute = value plugin_method()

Spring 2005

ECE450H1S

Software Engineering II

ERPlugin.java NFRPlugin.java IStarPlugin.java …

Spring 2005

ECE450H1S

Software Engineering II

3.2.2 Protégé

3.2.3 Eclipse

• ClsWidget, ExportPlugin, ImportPlugin, ProjectPlugin, SlotWidget, TabWidget, Widget • Plugins are packaged into a JAR file, under the “plugins” subdirectory • OMETab.java is a TabWidget plugin packaged as plugins/edu.toronto.cs.ome/OpenOME.jar http://www.eclipse.org/articles/Article-Plug-in-architecture/plugin_architecture.html And many articles on its plugin developments … plugin.xml, feature.xml Spring 2005

ECE450H1S

Software Engineering II

4. Think about these … • How would you classify the classes in edu.toronto.cs.ome.OME into the MVC pattern? • Which design pattern is used by WebService projects? • Which basic design patterns are used by the aforementioned Plugin patterns?

Spring 2005

ECE450H1S

Software Engineering II

5. Relation to your project • Opportunities: – You may add junit test cases to the code base to reveal bugs (publish it to the bug tracking system) and fix them (+5%) – You may apply design patterns, refactoring techniques on this legacy code base, showing as an improved complexity metrics (+2.5%) – You may tune the performance of the system to speed up the display, load/save for scalable graphs (+2.5%)

• Don’t forget your major project task (up to 100%!) – To study the editor methods in the OpenOME and adapt them to the OmniGraphEditor web service.

Spring 2005

ECE450H1S

Software Engineering II

Spring 2005

ECE450H1S

Software Engineering II