Design Patterns I Encapsulation, Observer, and Decorator CS 370 SE - - PowerPoint PPT Presentation

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Sep 21, 2023 819 likes •1.19k views

Design Patterns I Encapsulation, Observer, and Decorator CS 370 SE Practicum, Cengiz Gnay (Some slides courtesy of Eugene Agichtein and the Internets) CS 370, Gnay (Emory) Design Patterns I Spring 2014 1 / 9 Agenda Upcoming project

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Design Patterns I

Encapsulation, Observer, and Decorator CS 370 SE Practicum, Cengiz Günay

(Some slides courtesy of Eugene Agichtein and the Internets) CS 370, Günay (Emory) Design Patterns I Spring 2014 1 / 9

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Agenda

Upcoming project milestones: Today: setup a meeting with Bob to get help about your progress 4/3 get ready to deploy! 4/10 in-class demo and functional prototype opens for testing

CS 370, Günay (Emory) Design Patterns I Spring 2014 2 / 9

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Agenda

Upcoming project milestones: Today: setup a meeting with Bob to get help about your progress 4/3 get ready to deploy! 4/10 in-class demo and functional prototype opens for testing Today: Some design patterns you can use. . .

CS 370, Günay (Emory) Design Patterns I Spring 2014 2 / 9

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Patterns in Software Engineering

CS 370, Günay (Emory) Design Patterns I Spring 2014 3 / 9

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Patterns in Software Engineering

Don’t reinvent the wheel! Re-use existing patterns!

CS 370, Günay (Emory) Design Patterns I Spring 2014 3 / 9

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Entry/Exit Surveys

Exit survey: Version control

What’s the difference between centralized and distributed VCs? Which

ne is better and why?

Does version control help you recover from a situation where you deleted some files by mistake? If so, explain how.

Entry survey: Design Patterns

How do you design software? What are some components that need designing in your project? What kind of patterns can be reused during the design of your project? If possible, give some examples.

CS 370, Günay (Emory) Design Patterns I Spring 2014 4 / 9

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UML Cont'd: Use Cases & Stories

Sequence diagrams:
http://www.uml-diagrams.org/sequence-diagrams-examples.html
Use case diagrams:

http://www.agilemodeling.com/artifacts/useCaseDiagram.htm

Use case tips: http://www.andrew.cmu.edu/course/90-754/umlucdfaq.html

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Click on me!

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Example: SimUDuck

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Recap: Strategy Pattern

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Your class hierarchies?

Need some volunteers Tell us about your project classes:

CS 370, Günay (Emory) Design Patterns I Spring 2014 6 / 9

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Your class hierarchies?

Need some volunteers Tell us about your project classes:

Uses inheritance for what?

CS 370, Günay (Emory) Design Patterns I Spring 2014 6 / 9

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Your class hierarchies?

Need some volunteers Tell us about your project classes:

Uses inheritance for what?

Would encapsulation be useful?

CS 370, Günay (Emory) Design Patterns I Spring 2014 6 / 9

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Example of the observer pattern!

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Observer Pattern

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Observer Pattern

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Observer Pattern

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Observer Pattern Defined

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Java Observable

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Observer pattern in your project?

Can you think of a place that will be useful in your project?

CS 370, Günay (Emory) Design Patterns I Spring 2014 8 / 9

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Observer pattern in your project?

Can you think of a place that will be useful in your project?

◮ User notification ◮ Likes ◮ Button press in games CS 370, Günay (Emory) Design Patterns I Spring 2014 8 / 9

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Decorator Pattern

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Next week

Scrum now! Next week: Javascript

CS 370, Günay (Emory) Design Patterns I Spring 2014 9 / 9