Технология программирования
Информатика и вычислительная техника
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  • добавлен 07 ноября 2011 г.
Lasater C.G. Design Patterns
Издательство Wordware Publishing, 2006, -471 pp.

Design pattes have been around for quite a few years. They were originally created by the Gang of Four (Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides), which is responsible for formalizing the accepted design pattes we use today. Their use, while questioned and argued over by different programming schools of thought, has generally been accepted as "best practices" within the development community. The original takeoff of design pattes was brought about in the Java and C++ world.
Other languages like .NET (dot NET) have sprung up in recent years to fill certain marketing and technology voids left open by these languages, and have adopted design pattes in one way or another to mimic what was leaed by programmers in Java and C++. Even the previously script-oriented syntax of Visual Basic has blossomed into a fully object-oriented language, via Visual Basic.NET. Microsoft also added a Java-like language, which has related syntax and framework structure, in the form of C#, which is so much like Java that applying design pattes is a relatively expected conjecture.
Most programmers new to object-oriented languages seem to have the same dilemma when faced with whether or not to use or lea design pattes: Why should I? Usually the problem is that the ability and time required for leaing pattes-based programming is at a premium and the retu seems dubious. Someone not familiar with the why behind the methodology certainly will not continue on to the what and where. So explaining to people new to the concept why they should spend the time leaing design pattes can be difficult.
Another issue is availability and ease of dissemination of the relevant data. There have been numerous books and papers written on the uses and methodology of design pattes, but to a junior developer looking to improve basic skills or lea the skills needed to get a job, having to read complicated texts to lea a new methodology or way of thinking is out of the question. Senior developers looking to upgrade current skills can have similar issues, in that to augment their skill sets they have to do a large amount of research just to be able to understand the basics. Most of the texts available on design pattes are not easily referenced, and require an expanded understanding of object-oriented methodologies and pattes to even get through, and full comprehension may require reading the material several times from start to finish. There have been a few attempts to "dumb down" the data, but these seem to be more playful than useful, and leave project developers a little tued off by the lack of serious content of the work.
As a developer, as well as a development manager, I can assure you I have had the same problems. Whether leaing to use pattes or teaching them to others, I found there was no quick and easy reference to explain or lea which patte is appropriate in which case and why. I often struggled with the basics of object-oriented design when leaing pattes, and had to lea the hard way which methods worked where. One thing I did find was that design pattes were created and have evolved from the work of everyday code practices, and many developers are using them without actually knowing the established 23 pattes. When I first started to patte, I often had to search through many texts and websites, accessing several sources to understand a particular patte. This was hard when trying to meet deadlines, since time was crucial, and the only reason I persisted in leaing was because I saw there was a lot of value in what I did manage to understand.
After several years of this kind of thing, I began to write some articles for the Code Project site (www.codeproject.com). I started with aspects of things about which I saw value, but I thought were under- documented. I wrote in a fashion that I would like to read, something without a lot of complicated dialog that just stated problems and solutions in code and explanations of what I was doing and why. After a while I realized a lot of people seemed to respond to what I had written. That was when I decided that I should write this book.
The goal of this book is to give you, the reader, an easy to reference library of the recognized 23 design pattes as well as some principles of object-oriented programming that will help you become a better designer. I wrote this book for a specific audience, but I hope I wrote it in a way that those who are not coders can also get something out of it. The audience I am trying to reach is project developers, coders who do not have the time or patience for complicated or glitzy texts, but need real-world answers they can easily follow and use immediately in their own code.

Chapter 1: Why Patte?
Chapter 2: Creational Pattes
What Is a Factory Patte?
Abstract Factory Patte
Builder Patte
Prototype Patte
Singleton Patte
Chapter 3: Behavioral Pattes 53
Chain of Responsibility Patte
Command Patte
Interpreter Patte
Iterator Patte
Mediator Patte
Memento Patte
Observer Patte
State Patte
Strategy Patte
Template Patte
Visitor Patte
Chapter 4: Structural Pattes
Adapter Patte
Bridge Patte
Composite Patte
Decorator Patte
Facade Patte
Flyweight Patte
Proxy Patte
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