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Pattern-Oriented Software Architecture Volume 2: Patterns for Concurrent and Networked Objects ReviewThe book consists of three sections: a short introduction that outlines the problem space, a section containing a large collection of patterns, and a short final section that talks about weaving patterns into a pattern language and offers a few speculations as to the future of patterns.
The first section is quite short, but covers the problem space nicely and provides the motivation for what follows. The presentation is greatly helped by a case study for applying patterns to a concurrent web server; this illustrates how individual patterns can be used to solve particular problems and provides a practical perspective for how to make use of what is in the remainder of the book.
The second section constitutes the majority of the book and describes a large collection of network and concurrency patterns. Here is where the real meat of the book can be found, with 17 different patterns plus variants. There is something for everyone here, such as interceptor, reactor, acceptor-connector, etc. The patterns are presented clearly, with ample UML diagrams to support the extensive explanations. What I liked particularly is that the presentation is both complete and fair. For example, the double-checked locking pattern isn't just presented as a panacea for singleton initialization. Instead, you get explicit warnings about memory coherency issues, together with examples for how to deal with them, so you don't go and implement something and then wonder why it doesn't work...
The final section of the book shows how to connect patterns into a pattern language, such that each pattern nicely fits into a larger architectural whole. There is also some speculation as to where patterns might be headed next. (According to the authors, we are nowhere near having exhausted the topic.)
Overall, I was really impressed with this book. The text provides extensive references to existing literature, so if you are interested in learning about a particular topic in more detail, you'll find plenty of material for further reading. And there is an index that actually works (which is a rarity these days).
While the language is lucid, the book is probably not something you want to read in a single sitting. Instead, it's the sort of book you browse through, picking up interesting things as you go, and then referring back to them when you need more detail. (I read the book over a number of weeks, digesting a chapter at a time when it suited me.)
Overall, I highly recommend this book. While much of the content has been published previously, it's difficult to find elsewhere and not as up to date. Here, you get everything in one place, presented in a form that works both for learning and as a reference.
If you are interested in programming distributed systems, don't miss this--there is no other book that covers the ground anywhere near as well!
Pattern-Oriented Software Architecture Volume 2: Patterns for Concurrent and Networked Objects OverviewDesigning application and middleware software to run in concurrent and networked environments is a significant challenge to software developers. The patterns catalogued in this second volume of Pattern-Oriented Software Architectures (POSA) form the basis of a pattern language that addresses issues associated with concurrency and networking.The book presents 17 interrelated patterns ranging from idioms through architectural designs. They cover core elements of building concurrent and network systems: service access and configuration, event handling, synchronization,and concurrency. All patterns present extensive examples and known uses in multiple programming languages, including C++, C, and Java.The book can be used to tackle specific software development problems or read from cover to cover to provide a fundamental understanding of the best practices for constructing concurrent and networked applications and middleware.About the AuthorsThis book has been written by the award winning team responsible for the first POSA volume "A System of Patterns", joined in this volume by Douglas C. Schmidt from University of California, Irvine (UCI), USA.Visit our Web Page
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