Design Patterns #3 & MidTerm Review Reid Holmes

Transcription

1 Material and some slide content from: - GoF Design Patterns Book Design Patterns #3 & MidTerm Review Reid Holmes Lecture 13 - Thursday October

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3 MidTerm Review Intended Learning Outcomes: Critique an existing architecture or design. Differentiate how various architectural styles and design patterns enhance and degrade functionaland non-functional properties. Generate and justify and architecture and/or design given a collection of requirements. Produce and present concise and unambiguous architecture and design descriptions. Create and implement an architecture and design, refining it into a complete system.

4 ILO 1: Critique Critique an existing architecture or design. So what is architecture?

5 ILO 1: Critique Critique an existing architecture or design. Why is architecting software hard? What has improved complexity?

6 ILO 1: Critique Critique an existing architecture or design. Example: Given GWTs architecture, what is one benefit of 2nd generation web apps compared to GWT-based web-apps?

7 ILO 2: Differentiate Differentiate how various architectural styles and design patterns enhance and degrade functionaland non-functional properties. What is an architectural style? What is a design pattern?

8 ILO 2: Differentiate Differentiate how various architectural styles and design patterns enhance and degrade functionaland non-functional properties. Abstraction: Separation of concerns:

9 ILO 2: Differentiate Differentiate how various architectural styles and design patterns enhance and degrade functionaland non-functional properties. FPs: NFPs: Covered Styles: client-server, main / subroutine, OO, VM, layered, batch-sequential, pipe & filter, rule-based, blackboard, event-based, publish / subscribe, interpreter, mobile code, peer to peer. Covered Patterns: singleton, abstract factory, builder, proxy, facade, decorator, composite, visitor.

10 ILO 2: Differentiate Differentiate how various architectural styles and design patterns enhance and degrade functionaland non-functional properties. Security: Security Arch Principles:

11 ILO 3: Generate and Justify Generate and justify and architecture and/or design given a collection of requirements. Analysis vs design: Example: Apply your knowledge of architectural styles to architect a system that allows users to dynamically enter text commands that the system will then carry out. Provide a component diagram. Justify your selection of architectural style.

12 ILO 3: Generate and Justify Generate and justify and architecture and/or design given a collection of requirements. Example: DatabaseLayer layer = DatabaseLayer.getInstance(); What design pattern is being demonstrated above. Why is this pattern used? What visibility is applied to constructors in this pattern? Why?

13 ILO 4: Produce and Present Produce and present concise and unambiguous architecture and design descriptions. Alternative views:

14 ILO 4: Produce and Present Produce and present concise and unambiguous architecture and design descriptions. Example: - Create a component diagram for an event-based system that has a Producer component and a Consumer component connected to an event bus.

15 ILO 5: Create and Implement Create and implement an architecture and design, refining it into a complete system. This is really about the project.