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After a foreword by distributed computing pioneer David Gelernter, the book provides a short technology overview describing the makeup of JavaSpaces. The authors atomize their description of JavaSpaces as an overseer application that lets programs running on separate computers store and share persistent data. While the JavaSpaces API is by itself remarkably simple, this book demonstrates with deliberate fanfare the resolution of common distributed computing problems using complex design patterns.
Early sections look at the basics of reading, writing, and searching for data stored in JavaSpaces as well as presenting task and result bags as solutions to managing work done in parallel. The book also elaborates on the readers/writers problem, well-known within the field of computer science, and even offers a means of addressing it. The authors use code samples from a chat message server and a model of a paging system using message channels during their discussion of message passing and communication with JavaSpaces.
One section on distributed patterns presents some common solutions to doing work in parallel, including the Marketplace pattern, illustrated with an e-commerce bidding application. Further sections cover distributed events and transactions as they apply to JavaSpaces. The book closes with two excellent examples, one for a distributed messaging service and another for a brute force attack on encrypted passwords.
With the debut of JavaSpaces, business developers gain access to distributed processing previously available only to academic researchers. The JavaSpaces solution, along with JavaSpaces Principles, Patterns, and Practice, will let any Java developer audition distributed computing for the first time. --Richard Dragan
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Most Helpful Customer Reviews
21 of 22 people found the following review helpful:
5.0 out of 5 stars
Great book!,
By Ralph Morelli (Hartford, CT) - See all my reviews
This review is from: JavaSpaces™ Principles, Patterns, and Practice (Paperback)
This is a great introduction to the JavaSpaces technology, making it accessible to anyone with a basic understanding of Java. The main concepts are thoroughly and simply explained and the programming examples are very well developed and easy to follow. This book would be suitable for introducing undergraduates to basic operating systems concepts such as process synchronization and interprocess communication, as well as to some of the more exciting network based applications, such as distributed transactions and collaborative applications. It's clear that JavaSpaces technology can greatly simplify the teaching of important operating system and networking concepts such as thread synchronication and interprocess communication. As someone who has taught these courses, I've found that students have a hard time dealing with system semaphore and socket primitives. Quite often the basic concepts you're trying to teach get lost within a forest of implementation details. Not so with JavaSpaces. Check out the nicely developed Dining Philosophers and Readers/Writers examples in Chapter 4. The basic semaphore class is very simple to implement in JavaSpaces, which allows the discussion to focus on synchronization issues. Ditto for the basic Channel classes developed in Chapter 5. As all of these examples show, the use of JavaSpaces technology raises the level of abstraction, thereby making distributed programming much more widely accessible. As further evidence of this, consider the ease with which a very sophisticated internet messenger service is developed in Chapter 10. Making this kind of application accessible to undergraduates is quite impressive. This is a great book, and I will almost certainly use it the next time I teach our networking course.
13 of 13 people found the following review helpful:
4.0 out of 5 stars
Excellent virtual read, but fails a little in practicalities,
By dbrosius (East Norriton, PA) - See all my reviews
This review is from: JavaSpaces™ Principles, Patterns, and Practice (Paperback)
Javaspaces is a promising technology for solving difficult problems relatively easily. This book does what it says, it lays out the science behind Javaspaces clearly and concisely with good use cases, patterns and suggestions. The author is very clear and the book flows very well. Upon reading the book I was champing at the bit to experiment with JavaSpaces. It really is a super read. The problem is, however, that Javaspaces is a still-emerging technology. The simplicity and clarity that is documented in the book, does not directly tie over to the actual using of Javaspaces. The current tools are raw and unwieldy, and there are many difficulties trying to actual start a java space up. <scan the javaspaces mailing lists to get a taste>. Also, the mechanism used by the author to discover a javaspace is now considered passe, destined for deprecation. The book desperately needs a section on "JavaSpaces in the real world". Wading through the current tools and resolving the myriads of problems that occur. Also a section on basic Jini discovery services would be helpful, as would an up to date 'how to find a javaspace' chapter. All in all though, I would definitely recommend reading it, just be prepared for a steep Jini/Javaspaces learning curve after reading the book.
9 of 9 people found the following review helpful:
2.0 out of 5 stars
Outdated,
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This review is from: JavaSpaces™ Principles, Patterns, and Practice (Paperback)
Upon opening this book I was excited. Until I try to work with the examples and found that the examples were based on jini 1.0.The current jini release is 1.2.1 and some of the packages are different. I guess if I knew jini and javaspaces I could modify the examples to work with the new jini version, but then I wouldn't need the book.
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