Refactoring: Ruby Edition

Pearson Education
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The Definitive Refactoring Guide, Fully Revamped for Ruby

With refactoring, programmers can transform even the most chaotic software into well-designed systems that are far easier to evolve and maintain. What’s more, they can do it one step at a time, through a series of simple, proven steps. Now, there’s an authoritative and extensively updated version of Martin Fowler’s classic refactoring book that utilizes Ruby examples and idioms throughout–not code adapted from Java or any other environment.

The authors introduce a detailed catalog of more than 70 proven Ruby refactorings, with specific guidance on when to apply each of them, step-by-step instructions for using them, and example code illustrating how they work. Many of the authors’ refactorings use powerful Ruby-specific features, and all code samples are available for download.

Leveraging Fowler’s original concepts, the authors show how to perform refactoring in a controlled, efficient, incremental manner, so you methodically improve your code’s structure without introducing new bugs. Whatever your role in writing or maintaining Ruby code, this book will be an indispensable resource.

This book will help you

  • Understand the core principles of refactoring and the reasons for doing it
  • Recognize “bad smells” in your Ruby code
  • Rework bad designs into well-designed code, one step at a time
  • Build tests to make sure your refactorings work properly
  • Understand the challenges of refactoring and how they can be overcome
  • Compose methods to package code properly
  • Move features between objects to place responsibilities where they fit best
  • Organize data to make it easier to work with
  • Simplify conditional expressions and make more effective use of polymorphism
  • Create interfaces that are easier to understand and use
  • Generalize more effectively
  • Perform larger refactorings that transform entire software systems and may take months or years
  • Successfully refactor Ruby on Rails code
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About the author

Jay Fields is a software developer for DRW Trading and a frequent conference presenter. Jay has a passion for discovering and maturing innovative solutions. Jay’s website is available at www.jayfields.com.

Shane Harvie has delivered software in Agile environments in the United States, India, and Australia. He works for DRW Trading in Chicago and blogs at www.shaneharvie.com.

Martin Fowler is Chief Scientist at ThoughtWorks and one of the world’s leading experts in the effective design of enterprise software. He has pioneered object-oriented development, patterns, agile methodologies, domain modeling, UML, and Extreme Programming. His books include Refactoring, Analysis Patterns, and UML Distilled. His book, Patterns of Enterprise Application Architecture, won Software Development’s Jolt Productivity Award and Javaworld.com’s best Java book award.

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Additional Information

Publisher
Pearson Education
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Published on
Oct 15, 2009
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Pages
480
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ISBN
9780321604170
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Language
English
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Genres
Computers / Software Development & Engineering / Systems Analysis & Design
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Content Protection
This content is DRM protected.
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Eligible for Family Library

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The practice of enterprise application development has benefited from the emergence of many new enabling technologies. Multi-tiered object-oriented platforms, such as Java and .NET, have become commonplace. These new tools and technologies are capable of building powerful applications, but they are not easily implemented. Common failures in enterprise applications often occur because their developers do not understand the architectural lessons that experienced object developers have learned.

Patterns of Enterprise Application Architecture is written in direct response to the stiff challenges that face enterprise application developers. The author, noted object-oriented designer Martin Fowler, noticed that despite changes in technology--from Smalltalk to CORBA to Java to .NET--the same basic design ideas can be adapted and applied to solve common problems. With the help of an expert group of contributors, Martin distills over forty recurring solutions into patterns. The result is an indispensable handbook of solutions that are applicable to any enterprise application platform.

This book is actually two books in one. The first section is a short tutorial on developing enterprise applications, which you can read from start to finish to understand the scope of the book's lessons. The next section, the bulk of the book, is a detailed reference to the patterns themselves. Each pattern provides usage and implementation information, as well as detailed code examples in Java or C#. The entire book is also richly illustrated with UML diagrams to further explain the concepts.

Armed with this book, you will have the knowledge necessary to make important architectural decisions about building an enterprise application and the proven patterns for use when building them.

The topics covered include

· Dividing an enterprise application into layers

· The major approaches to organizing business logic

· An in-depth treatment of mapping between objects and relational databases

· Using Model-View-Controller to organize a Web presentation

· Handling concurrency for data that spans multiple transactions

· Designing distributed object interfaces

This is a practical guide for software developers, and different than other software architecture books. Here's why:

It teaches risk-driven architecting. There is no need for meticulous designs when risks are small, nor any excuse for sloppy designs when risks threaten your success. This book describes a way to do just enough architecture. It avoids the one-size-fits-all process tar pit with advice on how to tune your design effort based on the risks you face.

It democratizes architecture. This book seeks to make architecture relevant to all software developers. Developers need to understand how to use constraints as guiderails that ensure desired outcomes, and how seemingly small changes can affect a system's properties.

It cultivates declarative knowledge. There is a difference between being able to hit a ball and knowing why you are able to hit it, what psychologists refer to as procedural knowledge versus declarative knowledge. This book will make you more aware of what you have been doing and provide names for the concepts.

It emphasizes the engineering. This book focuses on the technical parts of software development and what developers do to ensure the system works not job titles or processes. It shows you how to build models and analyze architectures so that you can make principled design tradeoffs. It describes the techniques software designers use to reason about medium to large sized problems and points out where you can learn specialized techniques in more detail.

It provides practical advice. Software design decisions influence the architecture and vice versa. The approach in this book embraces drill-down/pop-up behavior by describing models that have various levels of abstraction, from architecture to data structure design.
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