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In 1994, Design Patterns changed the landscape of object-oriented development by introducing classic solutions to recurring design problems. In 1999, Refactoring revolutionized design by introducing an effective process for improving code. With the highly anticipated Refactoring to Patterns, Joshua Kerievsky has changed our approach to design by forever uniting patterns with the evolutionary process of refactoring.
This book introduces the theory and practice of pattern-directed refactorings: sequences of low-level refactorings that allow designers to safely move designs to, towards, or away from pattern implementations. Using code from real-world projects, Kerievsky documents the thinking and steps underlying over two dozen pattern-based design transformations. Along the way he offers insights into pattern differences and how to implement patterns in the simplest possible ways.
Coverage includes:
- A catalog of twenty-seven pattern-directed refactorings, featuring real-world code examples
- Descriptions of twelve design smells that indicate the need for this book’s refactorings
- General information and new insights about patterns and refactoring
- Detailed implementation mechanics: how low-level refactorings are combined to implement high-level patterns
- Multiple ways to implement the same pattern—and when to use each
- Practical ways to get started even if you have little experience with patterns or refactoring
Refactoring to Patterns reflects three years of refinement and the insights of more than sixty software engineering thought leaders in the global patterns, refactoring, and agile development communities. Whether you’re focused on legacy or “greenfield” development, this book will make you a better software designer by helping you learn how to make important design changes safely and effectively.
From the Back Cover
In 1994, Design Patterns changed the landscape of object-oriented development by introducing classic solutions to recurring design problems. In 1999, Refactoring revolutionized design by introducing an effective process for improving code. With the highly anticipated Refactoring to Patterns, Joshua Kerievsky has changed our approach to design by forever uniting patterns with the evolutionary process of refactoring.
This book introduces the theory and practice of pattern-directed refactorings: sequences of low-level refactorings that allow designers to safely move designs to, towards, or away from pattern implementations. Using code from real-world projects, Kerievsky documents the thinking and steps underlying over two dozen pattern-based design transformations. Along the way he offers insights into pattern differences and how to implement patterns in the simplest possible ways.
Coverage includes:
- A catalog of twenty-seven pattern-directed refactorings, featuring real-world code examples
- Descriptions of twelve design smells that indicate the need for this book’s refactorings
- General information and new insights about patterns and refactoring
- Detailed implementation mechanics: how low-level refactorings are combined to implement high-level patterns
- Multiple ways to implement the same pattern—and when to use each
- Practical ways to get started even if you have little experience with patterns or refactoring
Refactoring to Patterns reflects three years of refinement and the insights of more than sixty software engineering thought leaders in the global patterns, refactoring, and agile development communities. Whether you’re focused on legacy or “greenfield” development, this book will make you a better software designer by helping you learn how to make important design changes safely and effectively.
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Most Helpful Customer Reviews
21 of 22 people found the following review helpful:
5.0 out of 5 stars
Well written, easy to read, and genuinely useful,
This review is from: Refactoring to Patterns (Addison-Wesley Signature) (Hardcover)
Refactoring To Patterns brings together the Patterns movement, and the practice of Refactoring commonplace in the Agile community. Whereas the original Gang of Four book told us what patterns were, what sort of problems they solved, and how the code might be structured, Refactoring To Patterns illustrates how, why and when to introduce patterns into an existing codebase.The opening chapters cover the background, introducing both refactoring and design patterns, and the context in which the book was written. This gives the reader a clear overview of what is involved in Refactoring to Patterns, and paves the way for the refactoring catalogue which makes up the bulk of the book. The catalogue is divided into chapters based on the type of change required --- is this a refactoring to simplify code, generalize code, or increase encapsulation and protection? Each chapter has an introduction which gives an overview of the refactorings contained within that chapter, followed by the refactorings themselves. These introductions clearly illustrate the principles and choices which would lead one to follow the refactorings that follow. Each refactoring starts with a brief one sentence summary, and before and after structure diagrams with reference to the structure diagrams for the relevant pattern in the Design Patterns book. The sections that follow then cover the Motivation for using this refactoring, step-by-step Mechanics, and a worked Example, relating back to the steps given for the Mechanics. Finally, some of the refactorings finish with Variations on the same theme. The examples are all pulled from a small sample of projects, which are introduced at the beginning of the catalogue section, and help illuminate the instructions given in the Mechanics section. The mechanics themselves are generally clear, and broken down into small steps --- sometimes smaller steps than I might take in practice, but I think this is probably wise, as large steps can easily confuse. Finally, the Motivation sections do a good job of explaining why one would choose to do a particular refactoring, and any pitfalls to doing so --- the "Benefits and Liabilities" tables provide a useful summary. This book is well written, easy to read, and genuinely useful. It has helped me put some of the refactorings I do into a larger context, and given me insight into how I can integrate patterns with existing code, rather than designing them in up front. As John Brant and Don Roberts highlight in their Afterword, this is a book to study, the real benefit comes not from knowing the mechanics, but by understanding the motivation, and the process, so that one may apply the same thinking to other scenarios not covered by this book. If you are serious about software development, buy this book, inwardly digest it, and keep it by your side. Highly Recommended.
5.0 out of 5 stars
Great book - my review is mostly for Kindle edition.,
By
This review is from: Refactoring to Patterns (Kindle Edition)
This is the book where theory meets practice. I enjoyed the structure of the book and I highly recommend this book to anyone who doesn't have a complete understanding where & how to use design patterns. It is true that code samples were written in Java but it is not a big problem at all for developers who use other languages because samples are easy to follow for anyone who can follow pseudo-code.
Notes about the Kindle edition: I do not have the hardcover edition so I cannot compare them but the Kindle edition had some flaws in code samples. Joshua Kerievsky over-lined the code which is needed to be removed and used bold text to make the newly added code clearly visible. I think it is a very good formatting to understand what is going on while refactoring but in the Kindle edition of this book, some code lines were not over-lined although those lines were needed to be removed or some code lines were not bold although those lines were added newly. However it was not a huge problem because to understand each refactoring you need to study all of them one by one and while doing so, it is not difficult to understand what is going on in the code.
5.0 out of 5 stars
Great book on refactoring,
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This review is from: Refactoring to Patterns (Addison-Wesley Signature) (Hardcover)
This book provides an insight to refactoring and how patterns can assist in the process. The author provides case studies and examples of refactoring and how to achieve it successfully. I would recommend this book and also Refactoring by Martin Fowler
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