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Duane Gran contributes this review of Patterns of Enterprise Application Architecture, writing "The title of this book is a mouthful and the author, Martin Fowler, confronts headfirst complex topics of concern to software developers and architects. Fowler is a respected figure in software engineering circles, and his latest book is an attempt to codify best practices he learned in the trenches and through peer relationships. Many of the patterns will resonate with experienced developers, but Fowler's talent explaining abstract concepts will afford even the most grizzled reader many 'aha!' moments." Read on for the rest of Duane's review. Patterns of Enterprise Application Architecture author Martin Fowler pages 560 publisher Addison Wesley Professional rating 10/10 reviewer Duane Gran ISBN 0321127420 summary Excellent analysis of complex problem solving

The book is honest and upfront about grey areas in addition to (nearly) hard and fast rules. Fifty one patterns are described in an organized fashion, grouped by theme. The first section gives an overall narrative tying together the concepts while the remaining 4/5 of the book is devoted to short chapters on each pattern. In this way the book works well on two levels, as a reference and a tutorial. Code examples are given in Java and C# where most appropriate for the given pattern, however most examples use Java.

Much of the book centers around the task of Object-Relational mapping between the in-memory model of an application and the datastore. There are a surprising number of design choices in enterprise systems and I often found myself nodding in agreement with the logic behind the patterns. After establishing that mixing presentation and domain logic is a mistake worthy of horse-whipping, a plethora of smart alternatives are given.

I found this to be one of the more enlightening books I've read, and place it alongside Effective Java and Design Patterns Explained as canonical books for the Java developer. I'm a fan of the O'Reilly Java series, which excels in the HOW-TO category of books, but I've recently taken to the Addison-Wesley publications, which deal less with the nuts and bolts, and for lack of a better word are more like WHY-TO books.

Aside from being an excellent book, I also liked that it is hardbound and includes a bookmark (simple nylon strap from the binding). This is a fitting presentation for such a quality book.

The only complaint I might have is that sometimes the code examples are a tad brief for my taste. The author is fond of declaring a class as follows:

class ArtistMapper ...

From the UML diagrams provided I was often able to conclude that ArtistMapper extends AbstractMapper or that ArtistMapper implements Mapper, but as I read the examples I yearned for completeness. Two guesses come to mind as for this choice:

1. The author explains that the code examples are meant to facilitate understanding, not to provide boilerplate code. Fowler's appreciation for the complexity of software systems leads him to caution the reader to implement the examples without careful consideration to the context in which they are deployed. Partial code examples forces the reader to fill the gaps, and in the process may think more critically about it.
2. There is often more than one way to do things, like abstracting an interface in Java. The choice of extending an Abstract class or implementing an interface implies a subtle, but far-reaching, development choice. Similar to the previous point, I think Fowler may want the reader to choose a concrete class implementation appropriate for his or her application.

On the whole, I really enjoyed the book and would recommend it without hesitation to fellow software developers and architects.

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