Design and realisation of a knowledge base

3.3. Detailed design

At this part we will start by presenting some used design patterns; they are MVC, DAO and Session Façade.

3.3.1. Design pattern

A pattern describes a proven solution for a recurring design problem, placing particular emphasis on the context and helps surrounding the problem.

A design pattern is a general reusable solution to a commonly occurring problem in  software design. It is not a finished design that can be transformed directly into  code but a description or template for how to solve a problem that can be used in many different situations.

Object-oriented design patterns typically show relationships and  interactions between classes or  objects, without specifying the final application classes or objects that are involved. Many patterns imply  object-orientation or more generally mutable state, and so may not be as applicable in  functional programming languages, in which data is immutable or treated as such.

3.3.1.1. MVC