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Design Patterns Literature Review Chapter One Introduction What is a Design Pattern? A design pattern solves a problem within a given context. The solution that
Title The skylight running the length of the Design Center casts ever-changing patterns on the walls and floods the open court below with light. Photo, ISU Alumni
forces ? Buyers are free to switch to other goods (substitutes) and are Business Strategy Design Patterns 15-May-05 Page 7 of 26 forces sensitive to price, they accept
OOHDM is also used to improve the functions of Web information systems through the use of design patterns, which make Web sites easier to navigate. OOHDM is used
OOHDM is also used to improve the functions of Web information systems through the use of design patterns, which make Web sites easier to navigate. OOHDM is used
Submitted by sanhaw on June 23, 2008
Category: Technology
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Literature Review
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Chapter One
Introduction
What is a Design Pattern?
A design pattern solves a problem within a given context. The solution that is offered by implementing a pattern results in a system design structure, which balances the concerns of the design problem in a manner most appropriate for the given context. In “Understanding and Using Patterns in Software Development”, Dirk Riehle and Heinz Zullighaven offer a rather nice definition of what a design pattern is:
“A pattern is the abstraction from a concrete form which keeps recurring in specific non-arbitrary contexts.”
The ability to write good patterns is very difficult. A pattern should not only convey the facts about a system, but it should also tell a story about the system. It should allow the systems users to comprehend it, be able to customize it to accommodate new features.
Elements of a Design Pattern
A design pattern can be made up of the following components:
Name
The design pattern must have a meaningful name to allow a developer to use a single word or short phrase to reference the pattern.
Problem
The problem describes the patterns intent, the goal and objectives the pattern wants to achieve within the given context.
Context
The context of the pattern is the preconditions under which the problem and its solution seem to recur, and for which the solution is desirable.
Motivation
A description of the relevant forces/constraints and how they can interact/conflict with each other and the goals the pattern wishes to achieve.
Solution
The solution illustrates the structure of the pattern through UML diagrams, textual descriptions that include the patterns collaborations and participants.
Sample Example
One or more sample applications of the pattern which illustrates:
• A specific initial context
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