Design Patterns

All slides's in Module

DZone Reference Card

GOF Reference Card

Holub Catalogue

Logical Catalogiue

Introduction

An introduction to the module and its assessment mechanisms. Also, the key sources for general context.

Context

Position patterns in a continuum of Software Engineering knowledge. Explore contrasting definitions of patterns and introduce a definition of patterns appropriate to this module.

Programming Languages

Look at programming languages form a number of alternative perspectives. Explore, in particular, how languages approach typing and how we can categorize them according to a typing spectrum.

Patterns Case Study

Plunge into patterns by looking at an example problem/solution. Attempt to characterize the nature of a pattern in concrete terms.

Template Method

Create an abstract class that implements a procedure using abstract methods. These abstract methods must be implemented in derived classes to actually perform each step of the procedure.

Strategy

Have the class that uses the algorithm contain a reference to an interface (or abstract class) that has a method specifying a specific algorithm. Each implementation of the interface (or derived class) implements the algorithm as appropriate.

Solver

Review the Template Method and Strategy Patterns in the context of a simple problem.

XTend

Xtend is a good representative of a language exhibiting more modern approach to typing. We review it here and discuss its main features.

Lambda Solver

Explore the same problem in Xtend. In particular, review how the Xtend 'lambdas' mechanism can simplify the solution significantly.

Command

Encapsulate a request as an object facilitating the parameterization of clients with different requests, queuing requests and the potential support undoable operations.

Pacemaker Structure

Pacemaker reimplemented to incorporate the command pattern. This version is more sophisticated than the previous version - we model it here to get a general understanding of its structure.