Design of Multithreaded Software: The Entity-Life Modeling Approach Review

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Design of Multithreaded Software: The Entity-Life Modeling Approach ReviewDr Sanden has created a very impressive piece of literature. As a professor of computer science, I found this book to be an incredible asset to my professional "tool kit," so to speak. Further, Dr. Sanden's book would be critical asset as a text book as its narration keeps the reader enticed, yet has a number of solid application concepts. I unequivocally recommend this book as a professional asset as well as a text book. Again, this book is quite an impressive piece of work that is a strong contribution to this professional field.Design of Multithreaded Software: The Entity-Life Modeling Approach OverviewThis book assumes familiarity with threads (in a language such as Ada, C#, or Java)and introduces the entity-life modeling (ELM) design approach for certain kinds of multithreaded software. ELM focuses on "reactive systems," which continuously interact with the problem environment. These "reactive systems" include embedded systems, as well as such interactive systems as cruise controllers and automated teller machines.
Part I covers two fundamentals: program-language thread support and state diagramming. These are necessary for understanding ELM and are provided primarily for reference. Part II covers ELM from different angles. Part III positions ELM relative to other design approaches.


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Real Time Systems and Programming Languages: Ada 95, Real-Time Java and Real-Time C/POSIX (3rd Edition) Review

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Real Time Systems and Programming Languages: Ada 95, Real-Time Java and Real-Time C/POSIX (3rd Edition) ReviewThere are a number of excellent books on the topic of real-time systems. Few, if any, address the breadth of topics covered by this book, much less to the depth and quality exhibited here. Read as many of the others as you can, but if you must purchase only one book on real-time systems, this is the one to have. Indeed, I have each of the three previous editions of this book and this latest is, once again, worth every penny.
One of the reasons I hold such a high opinion of the book is that it is written by people who not only know what they are talking about, but can do so with clarity and precision. As leading contributors to scheduling theory and the real-time programming facilities of both Ada and Java, the authors are internationally recognized experts on real-time systems and programming languages. The text's depth reflects that fact, but it is also clear, concise, and a pleasure to read.
Another reason I recommend the book is that it has a good balance between theory and practice. Make no mistake, the necessary theory is covered extensively, but it is then illustrated with concrete examples using programming languages that are in wide-spread use today: Ada, C, and Java. As neither C nor Java were explicitly designed for concurrent real-time systems, the text includes the necessary extensions. For C, the POSIX real-time profile is used. For Java, the Real-Time Specification for Java (RTSJ) is used. When necessary, examples are provided in other languages as well.
In fact these three programming languages form the underlying context for much of the book. They are not themselves the subjects of the book, however, and those readers seeking an introduction to these languages should look elsewhere. Instead, the programming languages are used to explore the distinct nature of real-time systems and the requirements for developing applications in that domain. The code examples thus provide a means of illustrating the topic at hand, but also provide a means for comparing the strengths and weaknesses of the real-time facilities of the languages. The authors are leading contributors to the Ada 2005 Real-Time Systems Annex and the RTSJ for Java, a fact reflected in the detailed critical analysis provided.
I felt happy to purchase yet another edition of the book because of all the above, but also because of the additions (and removals) present in this edition. New material includes additional schedulability analysis theory and material on multi-processor and multi-core architectures. With respect to programming languages, the new material includes extensive coverage of the real-time systems programming additions to Ada 2005, the latest version of the RTSJ, and the new real-time POSIX profile enhancements for C. As for removals, the introductory material on the programming languages is no longer present. This change was a necessity for the sake of brevity, but the result is a better overall focus. Also removed is the chapter on distributed systems. I was sorry to see that go, but the primary points have been moved to other chapters. Discussion of other programming languages, such as occam2, are also removed for the sake of brevity but is available on the book's web site.
I should point out that this is not just a "timing" book. For example, real-time systems typically have reliability requirements as well as timeliness requirements. Reliability is thus covered extensively, as are a number of other topics that might not be immediately suggested by the title.
In summary, I am a real-time systems engineer with over 30 years of professional development, industry lecturing, and occasional university lecturing experience. Based on that combination, I give this book my highest recommendation to both professionals and students alike. The field of real-time systems is not for beginners, but developers (and managers) as well as more advanced university students will definitely benefit. Both will find a text they can use to learn the latest in the field.
PS: Note that, at the time of this writing, Amazon is for some reason showing some reviews for earlier editions of the book, not this latest (fourth) edition.
Real Time Systems and Programming Languages: Ada 95, Real-Time Java and Real-Time C/POSIX (3rd Edition) OverviewB> This book provides an in-depth analysis of the requirements for designing and implementing real-time embedded systems, and discusses how these requirements are met by current languages and operating systems.The comparative advantages of Ada 95, Real-Time Java, and Real-Time C/POSIX are discussed in full.The emergence of Java as a real-time language through the Real-Time Java extensions has resulted in the treatment of Java as one of the core languages covered in the book.The additional real-time facilities in POSIX are also explored, as well as the proposed extensions to CORBA to address real-time issues.More material on schedulability analysis is also included. No other book on real-time programming languages (or concurrent programming languages) covers this range of topics.This book is designed for programmers and engineers looking for an introduction and/or reference that discusses current real-time programming languages and how they are suited to designing and implementing real-time embedded systems.

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Enterprise Architecture: Creating Value by Informed Governance (The Enterprise Engineering Series) Review

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Enterprise Architecture: Creating Value by Informed Governance (The Enterprise Engineering Series) ReviewAfter reading Architecture Principles and Enterprise Architecture at Work I decided I would also read this book and Enterprise Governance and Enterprise Engineering as well. I am starting Enterprise Governance and Enterprise Engineering now. This series is great!!! I recommend every Enterprise Architect buy the series.
This book was the first of the series. It is only 145 pages long, but it is packed full of valuable information.
This book puts Enterprise Architecture into context. It gives a complete picture of Enterprise Architecture.
It starts with a great chapter on why Enterprise Architecture is needed and then has chapters on Positioning Enterprise Architecture, The Results of Enterprise Architecting, The Process of Enterprise Architecting, and The Enterprise Architect.
One of my favorite parts of the book is the description the book gives to the Enterprise Architect role. Anyone looking to hire or become an Enterprise Architect should read this chapter. It covers basic job descriptions, competencies (e.g. dedication, authenticity, integrity, negotiation, openness, stability, etc.), responsibilities, and personality types.
One of the things I didn't like about the book is that there is no index. This seems to be the case for the smaller Springer book, so I can't ding the authors for that.
This is a well rounded introduction to Enterprise Architecture. It covers all the basics in depth and also provides a really nice example to show you the results of Enterprise Architecting.
All in all I highly recommend this book for anyone involved in anyway with Enterprise Architecture. It will provide you a clear picture of what it involves.

Enterprise Architecture: Creating Value by Informed Governance (The Enterprise Engineering Series) OverviewTwenty years after the first publications and books on enterprise architecture, the domain is evolving from a technology-driven towards a more business-driven approach, thus empowering decision makers to adapt and transform an enterprise in order to keep up with changing business needs. At the same time the discipline of enterprise architecting has matured, leading to a better understanding of the profession of an enterprise architect.With this book, the authors aim to provide an overview of enterprise architecture including the process of creating, applying and maintaining it, thus taking into account the perspectives of CxOs, business managers, enterprise architects, solution architects, designers and engineers. They explore the results that are produced as part of an enterprise architecture, the process by which these are produced, and the role the architect plays in this process. As such, they do not describe a specific method for developing an enterprise (IT) architecture, nor do they define a specific modeling language for enterprise architecture, rather they offer the reader a fundamental way of thinking about enterprise architecture, which will enable him to select and apply the right approach, architecture framework and tools that meet the objective and context of the architecture work at hand. This approach is emphasized by discussion statements at the end of each chapter, sparking thoughts about benefits, shortcomings, and future research directions.Covering both theoretical foundations and practical use, and written in close collaboration between industry professionals and academic lecturers, Enterprise Architecture thus offers an ideal introduction for students in areas like business information systems or management science, as well as guidance and background for professionals seeking a more thorough understanding of their field of work.

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Software Architecture Design Patterns in Java Review

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Software Architecture Design Patterns in Java ReviewDesign patterns used to be the hottest topic around a couple of years ago. One of the side-effects was the "Applied Java Patterns" book which I very much liked and used to recommend to anyone looking for a "GoF" replacement using Java for code examples. Not anymore. From now on, I'm recommending Kuchana's "Software Architecture Design Patterns in Java".
Why am I so pleased with this book? What makes it any different than other design pattern books? Well, first of all the volume is huge. Kuchana's book covers all the original Gang of Four patterns plus another 20 or so patterns, including a couple of multithreading related patterns. Second, the text itself is very readable and doesn't cling too much on fancy words. The explanations are concise and to the point. Further kudos goes to dealing with such frequently asked questions like the difference between Factory Method and Abstract Factory.
To list some things I didn't like about this book, I have to say that having exercises without sample answers in the back was a tiny disappointment and I would've preferred a bit more condensed font for the code listings. That's about it.
All in all, a very good choice for filling the gaping design patterns encyclopedia slot in your bookshelf. Highly recommended.Software Architecture Design Patterns in Java OverviewSoftware engineering and computer science students need a resource that explains how to apply design patterns at the enterprise level, allowing them to design and implement systems of high stability and quality.Software Architecture Design Patterns in Java is a detailed explanation of how to apply design patterns and develop software architectures. It provides in-depth examples in Java, and guides students by detailing when, why, and how to use specific patterns. This textbook presents 42 design patterns, including 23 GoF patterns. Categories include: Basic, Creational, Collectional, Structural, Behavioral, and Concurrency, with multiple examples for each. The discussion of each pattern includes an example implemented in Java. The source code for all examples is found on a companion Web site.The author explains the content so that it is easy to understand, and each pattern discussion includes Practice Questions to aid instructors. The textbook concludes with a case study that pulls several patterns together to demonstrate how patterns are not applied in isolation, but collaborate within domains to solve complicated problems.

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Patterns for Computer-Mediated Interaction (Wiley Software Patterns Series) Review

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Patterns for Computer-Mediated Interaction (Wiley Software Patterns Series) ReviewWhenever I get a new book to review, I always approach it with a mixture of anticipation, curiosity, and dread, especially given the increasing number of books about patterns and, in this case, the size -- 581 pages! When I finally found a small window and sat down with "Patterns for Computer-Mediated Interaction," I was intending to hurriedly skim as much of the text as possible to get an idea of what it was like. Several hours later, I was hooked. What a surprise this book is! Yes, it's topical. The patterns are about developing software to allow people to have the best interaction experience possible. That is where the world is headed, no doubt! The patterns in this book, however, are not just about the technical aspects of these systems, the authors also address the "socio-technical" issues that are important for the people-side of this domain. What was especially interesting to me, as a long-time "patterns fan," was the intriguing and enlightening discussion of pattern languages and the close examination of the pattern language of Christopher Alexander. I've read many essays on this topic but this presentation was very special. I learned a lot. You can't ask for more than that. I can recommend this book whole-heartedly, not only for developers in this domain but also for anyone who wants to study a model pattern language and learn more about patterns and how they work together to solve problems. Two thumbs up!
Patterns for Computer-Mediated Interaction (Wiley Software Patterns Series) OverviewWritten by well-respected experts, this how-to guide provides patterns for the design of human computer human interaction (HCHI). An increasing number of applications are currently designed for use by more than one user, eg: multi-player games, interactive web sites, mobile phones, collaborative learning systems, interactive workspaces and smart environments. In these areas there is a shift from (HCI) human computer interaction to (HCHI) human computer human interaction. The role of patterns in this movement is twofold: 1st – patterns focus on the human user of the system; 2nd – patterns assist developers in the development process of groupware applications.

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Practical API Design: Confessions of a Java Framework Architect Review

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Practical API Design: Confessions of a Java Framework Architect ReviewEnough said.
This and Effective Java by Bloch are the two books every Java programmer should have read. It will change the way you program and you'll be grateful for the change. The examples in this book are in Java but that's because they had to be in some language; I don't think any part of this book is specific to Java. If your code is consumed by other people, or even a future self, then this book will help you think through issues you may not have know you have. It did me.
In my opinion, this is those one of those once in a decade books that changes the game for anyone who reads it.
A totally mature, non-didactic work written by someone with that perfect combination of real-world experience, a high intellect, a no BS attitude, and humility.
This book is like getting a magical time telescope- you can see what the decisions you are making in your coding today will actually lead to in the future and what the inescapable consequences will be for you.
Actually, reading this book is a little like being put into the role of Scrooge being visited by the three ghosts of Christmas. You get to see what's going to happen to you because of your past and present actions before it happens. At it's heart it's a longitudinal study of how code is first consumed, abused and misused by other programmers and how those abuses become dependencies which determine what YOU, the code's author can and cannot do in future releases.
In a very small nutshell- totally innocent innocuous, completely legal and even recommended programming practices which you apply every day in your code can and will completely shut down any chance for your code to evolve in any rational way going forward in future releases. Why? Because you can't see the potential consequences of consumers of your code doing something you never thought they might do in ways you never meant for them to do it.
But here's a guy who did do those things and lived to pay the price.
For example, if you think that using interfaces (in Java) is usually the best way to program, then you might have a nasty surprise coming at you when other people (damn them!) actually start to program against your code.
When the book's over, you might be as happy as Scrooge that there's still time to change things before it's too late.
Like Bloch's Effective Java, the lessons in this book are so important that they're destined to become diffused throughout the general programming culture and become known to people who haven't even heard of the book. But can you wait until all that filters down to you through osmosis?
Practical API Design: Confessions of a Java Framework Architect OverviewThe definitive guide to API design, this book will be required reading for all designers and engineers involved with the development, testing, and maintenance of APIs.

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Refactoring: Improving the Design of Existing Code Review

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Refactoring: Improving the Design of Existing Code ReviewLike the Gang of Four's landmark book _Design Patterns_, Fowler and his cohorts have created another catalog-style book, this time on refactoring.
Refactoring refers to taking existing, working software, and changing it about to improve its design, so that future modifications and enhancements are easier to add. _Refactoring_ is primarily a catalog of 70 or so different kinds of improvements you can make to object-oriented software.
Each entry in the catalog describes an implementation problem, the solution, motivation for applying the solution, the mechanics of the refactoring, and examples. The book's examples are all in Java, but C++ programmers should be able to approach the refactorings with ease. Often, Fowler diagrams the refactorings in UML, so a little Unified Modeling Language experience will help, too.
While the catalog is nice, the kinds of refactorings are obvious is most cases. Even moderately experienced programmers won't need the step-by-step mechanics described. The real benefit, though, is that the mechanics of each refactoring help guarantee that you can pull off the refactoring without introducing new bugs or side effects. They encourage you to take smaller, verifiable steps, than the more gross refactorings that most developers would naturally take. You actually save time doing so.
How do you know your refactorings are safe? Unit testing is the answer that Fowler et al. provide. Java developers will find the introduction to the Junit Testing Framework the most valuable part of the book, more so than the catalog of refactorings itself.
There's more to the book than the catalog and Junit, of course. There's discussion of the history of refactoring, how to evaluate refactoring tools, and how to convince management that what appears to be an overhead activity is actually useful in the long run.
Unfortunately, these sections are all too brief. And there is no discussion of how refactoring fits in with various software development processes. For example, programmers using Extreme Programming (XP) would probably feel right at home with Fowler's recommendations of refactoring in duets and unit testing, but developers stuck with a Software Engineering Institute process like PSP categorize testing as failure time and something to be minimized if not avoided. Cleanroom developers are taught that unit testing inteferes with metrics for quality, and that verifications are what should be done. Should such developers redo verifications after each refactoring? There's no answer in this book.
An unusual chapter, called "Bad Smells in Code," gives overall motivation for the refactorings. These vague notions, such as "long methods" or "lazy classes" humorously provide a foundation for starting your own refactorings. I say "humorously" because (mostly) Beck's and Fowler's odd analogies (classes becoming too intimate and delving in each others' private parts) provoke a chuckle (as if a chapter about "bad smells" in code weren't enough).
Overall, I've enjoyed reading this book and referring to the catalog while putting my own unit tests and refactorings into practice. Fowler's writing style is smooth and fluid, and it's easy to digest the catalog in no time. The book's typesetting is crisp, the figures quite clean, and both the refactoring index and "smell" index are enormously useful.Refactoring: Improving the Design of Existing Code OverviewRefactoring is about improving the design of existing code. It is the process of changing a software system in such a way that it does not alter the external behavior of the code, yet improves its internal structure. With refactoring you can even take a bad design and rework it into a good one. This book offers a thorough discussion of the principles of refactoring, including where to spot opportunities for refactoring, and how to set up the required tests. There is also a catalog of more than 40 proven refactorings with details as to when and why to use the refactoring, step by step instructions for implementing it, and an example illustrating how it works The book is written using Java as its principle language, but the ideas are applicable to any OO language.

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Framework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries Review

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Framework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries ReviewDepending on your experience with the .NET framework, you may consider the contents of this book as everything from invaluable insights to mildly amusing explanations of a few details of .NET you've always wondered about.
Krzysztof Cwalina and Brad Abrams have worked with designing the public API of the .NET framework from its beginning, and during that process they have compiled a comprehensive guideline for framework design. It is basically this internal guideline they are now publishing as a book.
The text is easy to read and makes for a good reference book. It is littered with more free-form comments from lots of other experts such as Jeffrey Richter, Christopher Brumme, and the occasional comment from Anders Hejlsberg. However, it is mostly reminiscent of a Word document with lots of revision comments liberally sprinkled all over, and I suspect this is how book was made: Take an internal guideline document and polish it off; pass it around to a lot of collegues in Microsoft and ask them to comment on it; incorporate most comments verbatim in the text; and publish.
That said, I still found myself using lots of the little insights in the book in my work in the weeks after having read it. Most of those insights actually came from the free-form comments, so I'm not complaining.
If you use FxCop and are familiar with many of the rules in this tool, most of the guidelines in this book will come as no surprise to you. FxCop was originally a project of Krzysztof's and Brad's designed to automate much of their code review work, so you can learn most of the contents of this book just by using FxCop.
As such, almost all the guidelines in the book are publicly known material, but it's still a well organized reference, and the little extra comments from the authors and lots of other people are what made this book a worthwhile read for me.
I wouldn't consider this book essential reading for .NET developers, but it basically supplements FxCop pretty well.Framework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries OverviewA new edition of this title is available, ISBN-10: 0321545613 ISBN-13: 9780321545619"This book is an absolute must-read for all .NET developers. It gives clear do and don't guidance on how to design class libraries for .NET. It also offers insight into the design and creation of .NET that really helps developers understand the reasons why things are the way they are. This information will aid developers designing their own class libraries and will also allow them to take advantage of the .NET class library more effectively."--Jeffrey Richter, author/trainer/consultant, Wintellect"Framework Design Guidelines will help you in two important ways. First, any .NET developer will benefit from a greater understanding of the design principles that govern the .NET Base Class Library. Second, a deeper understanding of these principles will help you to create software that integrates well with the .NET environment. Quite frankly, this book should be on every .NET developer's bookshelf." --Bill Wagner, founder and consultant, SRT Solutions, author of Effective C#"Not since Brooks' The Mythical Man Month has the major software maker of its time produced a book so full of relevant advice for the modern software developer. This book has a permanent place on my bookshelf and I consult it frequently."--George Byrkit, senior software engineer, Genomic Solutions"This book is a must-read for all architects and software developers thinking about frameworks. The book offers insight into some driving factors behind the design of the .NET Framework. It should be considered mandatory reading for anybody tasked with creating application frameworks."--Peter Winkler, senior software engineer, Balance Technology Inc."Frameworks are valuable but notoriously difficult to construct: Your every decision must be geared towards making them easy to be used correctly and difficult to be used incorrectly. This book takes you through a progression of recommendations that will eliminate many of those downstream 'I wish I'd known that earlier' moments. I wish I'd read it earlier."--Paul Besly, principal technologist, QA"Filled with information useful to developers and architects of all levels, this book provides practical guidelines and expert background information to get behind the rules. Framework Design Guidelines takes the already published guidelines to a higher level, and it is needed to write applications that integrate well in the .NET area."--Cristof Falk, software engineerFramework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries teaches developers the best practices for designing system frameworks and reusable libraries for use with the Microsoft .NET Framework and WinFX. This book focuses on the design issues that directly affect the programmability of a framework, specifically its publicly accessible APIs. This book can improve the work of any .NET developer producing code that other developers will use. An added benefit is a collection of annotations to the guidelines by various members of the Microsoft .NET Framework and WinFX teams, which provide a lively discussion of the motives behind the guidelines, along with examples of good reasons for breaking the guidelines.Microsoft architects Krzysztof Cwalina and Brad Abrams offer guidelines for framework design from the top down. From their long experience and deep insight, you will learnThe general philosophy of framework design Principles and guidelines that are fundamental to overall framework design Naming guidelines for the various parts of a framework, such as namespaces, types, and members Guidelines for the design of types and members of types Issues and guidelines that are important to ensure appropriate extensibilityin your framework Guidelines for working with exceptions, the preferred error reporting mechanism in the .NET Framework and WinFX Guidelines for extending and using types that commonly appear in frameworks Guidelines for and examples of common framework design patternsGuidelines in this book come in four major forms: Do, Consider, Avoid, and Do not. In general, a Do guideline should almost always be followed, a Consider guideline should generally be followed, an Avoid guideline indicates that something is generally not a good idea, and a Do not guideline indicates something you should almost never do. Every guideline includes a discussion of its applicability, and most guidelines include a code example.A companion DVD includes the Designing .NET Class Libraries video series, instructional presentations by the authors on design guidelines for developing classes and components that extend the .NET Framework. A sample API specification and other useful resources are also included.

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Applying Domain-Driven Design and Patterns: With Examples in C# and .NET Review

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Applying Domain-Driven Design and Patterns: With Examples in C# and .NET ReviewI was surprised that this book slipped under my radar for almost 3 months. I've been on the lookout for just such a unifying tome of knowledge that relates patterns and domain-driven design (DDD) to a practical .NET example for quite some while. The book delivers well on its promises, significantly surpassing the only other real competitor, Foundations of Object-Oriented Programming Using .NET 2.0 Patterns. The pros and cons, as I see them, are outlined below:
PROS
* Combines the ideas of Domain Driven Design (Evans) with Patterns of Enterprise Application Architecture (Fowler). These books are pretty much mandatory reading prior to diving into this book.
* Draws upon a myriad of other well-known sources, including materials from Refactoring to Patterns and the GoF, work from Johnson and Lowy, as well as a rare reference to Naked Objects. The more experienced and better read you are, the more this stuff will make sense.
* Rare .NET coverage of advanced concepts like Plain Old CLR Objects (POCOs), persistence ignorant (PI) objects, O/R mapping with NHibernate, Dependency Injection, Inversion of Control, and Aspect-Oriented Programming.
CONS
* While some sections are really insightful and could contain more interesting materials, other sections seem to drone on too long. The work on defining the NUnit tests, in particular, flows like a stream of consciousness and doesn't really add a lot of structured value to understanding DDD, patters, or TDD for that matter.
* Embedded comments in the text adopt from the style used in Framework Design Guidelines. It worked very well for Cwalina / Abrams in their book because it seemed planned in from the outset. Comments like "one reviewer commented on the code with the following, more succinct version" seem like editorial comments left in and not collaborative authoring by design.
All-in-all a very solid book that fills a unique market niche, leaving it pretty much without peers. If Amazon had a 4.5 starts rating, Applying DDD would get it. As a secondary reference book, it doesn't offer the earth shattering insights of some of the innovative source materials found in the Fowler Signature Series, for example. It does, however, weave together an interesting example of how to tie all of these concepts together for the .NET architect looking to take their understanding to the next level.Applying Domain-Driven Design and Patterns: With Examples in C# and .NET OverviewApplying Domain-Driven Design and Patterns is the first complete, practical guide to leveraging patterns, domain-driven design, and test-driven development in .NET environments. Drawing on seminal work by Martin Fowler and Eric Evans, Jimmy Nilsson shows how to customize real-world architectures for any .NET application. You'll learn how to prepare domain models for application infrastructure; support business rules; provide persistence support; plan for the presentation layer and UI testing; and design for service orientation or aspect orientation. Nilsson illuminates each principle with clear, well-annotated code examples based on C# 2.0, .NET 2.0, and SQL Server 2005. His examples will be valuable both to C# developers and those working with other .NET languages and databases -- or even with other platforms, such as J2EE.

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Design Patterns: Elements of Reusable Object-Oriented Software Review

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Design Patterns: Elements of Reusable Object-Oriented Software ReviewThis book really changed my way of thinking about object-oriented design. The idea is that when designing a new class hierarchy, though implementation details may differ, you often find yourself using the same kinds of solutions over and over again. Rather than approaching each design task out of context as an individual, isolated problem, the strategy is to study the task and identify the underlying design pattern most likely to be applicable, and follow the class structure outlined by that pattern. It's a "cookbook" school of design that works amazingly well.
There are other advantages to this book. It isolates 23 of the most common patterns and presents them in detail. You wouldn't think that 23 patterns would be enough, but once you become adept at recognizing patterns, you'll find that a large fraction of the patterns you use in practice are among these 23. For each pattern, the book carefully presents the intent of the pattern, a motivating example, consequences of using that pattern, implementation considerations and pitfalls, sample code (C++ or Smalltalk), known uses of that pattern in real-world applications, and a list of related patterns.
Upon first reading, you will start to recognize these patterns in the frameworks you see. Upon second reading, you'll begin to see how these patterns can help you in your own designs, and may also start to see new patterns not listed in the book. Once you become familiar with the pattern concept, you will be able to originate your own patterns, which will serve you well in the future. One of the most valuable contributions of this book is that it is designed not merely to help you identify patterns, but to give you a sense of which patterns are appropriate in which contexts.
I think this book is particularly valuable to many C++ and Java programmers, because of the dynamic and flexible design philosophy it follows. (Its two fundamental principles of reusable OO design are: "Program to an interface, not an implementation" and "Favor object composition over class inheritance".) I've found that many C++ books unfortunately tend to emphasize a rather static and inflexible design philosophy. Many C++ programmers do not realize how the language and the books they've studied from have been limiting their thinking until they have been exposed to ideas from other lanugages. The authors of this book have obviously been influenced by other languages as well, especially Smalltalk, and have brought many of its best lessons to C++ design. Most Java books seem to take after the C++ books, even though Java is a more dynamic language. This book may help Java programmers take full advantage of the extra power offered by their language, if they look deeply enough into some of the lesser-known features its runtime system affords.
Last, but not least, this book is valuable because it names the patterns it uses, and so gives programmers a common vocabulary to describe design concepts, rather than particular implementations. You'll find yourself saying things like, "That would be a good use for a Decorator", or "Should we use a Facade or a Mediator in this case?" I encourage readers of this book to use this vocabulary with other programmers.
In summary, this is one of the few books that I think belongs on every programmer's "must-have" list. Not to overuse a cliche, but like object-oriented design itself, the pattern concept is one of those rare paradigm-shifts in computer programming. It is equally valuable to expert professional and novice student alike. The book has a home page at http://st-www.cs.uiuc.edu/users/patterns/DPBook/DPBook.htmlDesign Patterns: Elements of Reusable Object-Oriented Software Overview

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