CSC/ECE 517 Fall 2007/wiki3 6 rs

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Problem Description

Take the Controller pattern (which we did not cover in class) and catalog the information on it available on the Web. Find good descriptions and good, concise, understandable examples. Tell which you consider the best to present to a class.

Introduction

There are various kinds of design patterns, to help us structure our code and component in order to solve some specific problem and to have effective code for the problem. Craig Larman has defined a set of design patterns which are called as the General Responsibility Assignment Software Patterns (GRASP). GRASP is a tool for learning object oriented design with principles. Controller pattern is one among the GRASP patterns.

There are several principles available for object oriented programming, but these principles cannot be considered as patterns. When we consider cohesion and coupling they are good design principles but do not belong to the group of design patterns. GRASP patterns defines two major types of responsibilities of the patterns-     

  • The object knowing the responsibilities
  • The object doing the responsibilities

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