Friday, April 29, 2011

Quick Recap: Chapters 51 to 58

Let us quickly review whatever we learnt about Design Patterns in the previous few chapters

• A design pattern describes a proven solution to a recurring design problem, placing particular emphasis on the context and forces surrounding the problem, and the consequences and impact of the solution
• There are 5 design patterns in the SCWCD Exam:
     o Value Object Pattern
     o Data Access Object Pattern
     o Business Delegate Pattern
     o Model View Controller Pattern &
     o Front Controller Pattern
• The Value Object pattern provides the best way to exchange data across tiers or system boundaries, especially when there is network communication involved. This is a pattern that solves performance issues around network latency
• The DAO pattern provides the connection between the business logic tier and the resource (usually a database) tier. The Data Access Object represents a general interface to the resources layer: It handles all calls to it. JDBC is the most commonly used example of this
• The Business Delegate pattern reduces the dependency between tiers. It is an attempt to make tiers interchangeable so one can access or utilize the services of any other
• The Model-View-Controller architecture compartmentalizes the data and business logic (model) from the presentation (view) from the user action interpreter (controller).
• The Front Controller pattern presents one entry point to a Web site or service. It provides a centralized entry point that controls and manages Web request handling. It eliminates the dependency of the user on a direct resource.

The Key Terms we learnt in the previous few chapters are:

• Design Patterns
• Model-View-Controller
• Value Object
• Data Access Object
• Front Controller
• Business Delegate

Previous Chapter: Chapter 58 - Other Design Patterns

Next Chapter: Self Test - Chapters 51 to 58

No comments:

Post a Comment

© 2013 by www.inheritingjava.blogspot.com. All rights reserved. No part of this blog or its contents may be reproduced or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the Author.

ShareThis

Google+ Followers

Followers