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Software Design

Software Design. ‘Requirements’ defines The goals the system needs to satisfy. ‘Specification’ defines The externally-observable behaviour of the system. ‘Architecture’ defines The major system-level components Their methods of interaction Technology used ‘Design’ of a component

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Software Design

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  1. Software Design • ‘Requirements’ defines • The goals the system needs to satisfy. • ‘Specification’ defines • The externally-observable behaviour of the system. • ‘Architecture’ defines • The major system-level components • Their methods of interaction • Technology used • ‘Design’ of a component • The code that needs to be written. • We will focus exclusively on OO design. CSC407

  2. Output of Design • A document: • Prose description • UML • Classes • Associations • Methods • Attributes • Object diagrams • Sequence and collaboration diagrams • Statechart and activity diagrams • Formulae & algorithms • Must relate to the architecture • Can reference the requirements and specification • Must be sufficient to allow coding to commence CSC407

  3. Necessary Background • Experience in OO programming • Experience in OO analysis • An understanding of OO concepts • Encapsulation (data hiding) • Objects, classes, meta-classes • Classes v.s. interfaces (types) • Inheritance, multiple inheritance • Polymorphism (run-time typing) • Implementation inheritance v.s. interface inheritance CSC407

  4. Goal • To teach you to create good OO designs. • What you need: • Tools (UML notation) • Experience • How we will teach you: • UML in tutorials • Next best thing to experience: • Other people’s experience • Design Patterns CSC407

  5. Object-Oriented Design • Take OOA and extend to build the ‘Problem Domain Component’ • Design the ‘Human Interaction Component’ • Design the ‘Task Management Component’ • Design the ‘Data Management Component’ [Peter Coad & Edward Yourdon, OOD, Yourdon Press, 1991] CSC407

  6. Problem Domain Component • Reuse design and programming classes. • Group problem-domain-specific classes and establish a protocol by adding generalization classes. • Accommodate inheritance limitations in implementation language. • Add design classes • Associations • Run-time modifiability • … • Improve performance • Speed, memory, perceived speed • Support the data management component CSC407

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