- Taschenbuch: 385 Seiten
- Verlag: Addison Wesley (Juni 1999)
- Sprache: Englisch
- ISBN-10: 0201616343
- ISBN-13: 978-0201616347
- Größe und/oder Gewicht: 1,9 x 19 x 24,1 cm
- Durchschnittliche Kundenbewertung: 5 Kundenrezensionen
- Amazon Bestseller-Rang: Nr. 4.020.951 in Fremdsprachige Bücher (Siehe Top 100 in Fremdsprachige Bücher)
- Komplettes Inhaltsverzeichnis ansehen
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The Jini Specification (Jini Series) (Englisch) Taschenbuch – Juni 1999
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What does Sun's Jini technology mean for the future of distributed computing? To find out, take a look at The Jini Specification, a guide written for IS managers and Java developers alike.
The book starts with what Jini is and how it works. (In short, Jini allows Java clients to invoke remote services easily through Java.) The authors present a chat message server and explain the Jini architecture where clients look up and "lease" remote services.
The heart of this book is its coverage of classes in the Jini specification. First there's an overview of Jini illustrated with a printer service. Then it's a close look at how clients "discover" Jini services, either through multicast or unicast protocols. (The authors also present useful built-in utility classes here.)
Next comes material on storing entries for Jini services (used for identifying them across the network) and the classes used to "lease" remote services. An interesting section on remote events contrasts them with local JavaBean events. Then it's on to Jini transactions, including the two-phase commit process used to manage work done remotely.
Later the book turns to the new JavaSpaces classes, which permit sharing data between Java processes in order to facilitate parallelism. An intriguing appendix reprints a white paper in which the Sun team outlines its philosophy of distributed computing. (They argue that local and remote objects need to be handled differently: object location transparency is a myth.)
With a mix of technology briefing and nuts-and-bolts detail, The Jini Specification delivers a valuable perspective on the latest advance in Java distributed computing from Sun. --Richard Dragan
Jini technology represents a significant step in the evolution of distributed computing, as a simple yet remarkably reliable and flexible infrastructure that enables all types of devices to simply connect into impromptu networks, making access to and delivery of new network services as simple as plugging in a telephone. Built on top of a Java software infrastructure, Jini technology enables all types of digital devices to work together in a community organized together without extensive planning, installation, or human intervention. In a Jini distributed system, Java programs interact spontaneously, enabling services to join or leave the network with ease, and allowing clients to view and access available services with confidence. A Jini system can link office components such as printers, faxes, and desktop computers. Beyond these traditional networks, the technology is also ideal for building the home-based networks that are now emerging: entertainment systems, cars, smart houses, and personal computers. This book contains the formal specification for the Jini technology.It offers a review of distributed computing fundamentals, an overview of the Jini architecture, and an introduction to the key concepts that are the source of the technology's simplicity and power--remote objects, leasing, distributed events, and a two-phase commit protocol.The formal specification provides the definitive description of every element of the Jini architecture, including detailed information on such topics as: *Jini Discovery and Join protocols *Jini Entry usage and the AbstractEntry class *Jini Distributed Leasing concepts *Jini Distributed Event programming model *Jini Transaction model and semantics *Jini Lookup service and lookup attribute schema *Jini device architecture As networks continue to pervade our personal and professional lives, there is an urgent call for the flexible and robust network infrastructure that Jini represents. 0201616343B04062001 Alle Produktbeschreibungen
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The book not only covers JINI specifications, but has a clear theory on what it is, with code samples and very clean writing fashion.
Moreover, it is short and to the point. I strongly recommend this book to distributed design professionals and students, as it gives a latest tech flavour for them to be in touch and know tommorrows' computing arena.
That's the vision behind Jini. But that vision goes much further. Not only can hardware devices talk to one another, but also software services. In a Jini world, you won't care whether how a device works, or whether it is software or hardware based. An Internet based fax service will act as a fax, as will a hardware device. You'll just look for a fax service, without worrying how the service is implemented. Of course, someone needs to write the software that will power Jini services. That's where The Jini Specification comes in.
The book is divided into two main sections, an overview and the specification for Jini. The overview provides an easily accessible overview of what Jini is, how it works, and what it can achieve. There are also several examples of Jini services and clients, to give you some practical experience with building Jini software applications.
From there, the book dives headfirst into the actual specification. The first part of the book is good for managers, and software developers alike. The coverage of the specification, however, is designed as a reference for developers as they construct Jini software. This is where many readers could become lost, unless they are already using Jini in action. The first part of the book is a guide to Jini, the second intended only as a reference during development. Finally, a glossary of Jini terms and an essay on distributed computing is included, along with the full source code from the overview.
The Jini Specification is a must-have for anyone considering Jini development. It provides an excellent guide to Jini technology for those considering designing Jini-based systems, and a comprehensive printed reference for those who will implement them. -- David Reilly, for the Java Coffee Break
I don't understand why Sun Microsystems, on their website and in thier books, (and this book is no exception) do not use UML to describe their libraries and frameworks. I, for one, learn a lot about dependencies and collaborations between classes when UML is employed. In the sections that have real code examples, it would be helpful to have a snippet of UML describing the section of Jini critical to that example, for instance.
Furthermore, in the earlier sections of the book, the overview, the authors use what I call "system collaboration diagrams", even better would be when they are explaining code snippets to highlight in their system collaboration diagrams what part of the system they are showing an example of.
I guess I just found the explaination of the examples lacking. The examples themselves are excerpted, making them hard to follow. For instance, it is confusing to see an ordinary method being called (from within an excerpt) with no class or object qualified before it. Is it in the superclass? In the implementation? If in the superclass, how far up? This is especially difficult when referring to the DEM of Java, which sometimes seems counterintuitive to beginners.
My rule of thumb is one should never look at a piece of code and get "nervous" about what a symbol or method is supposed to be doing there.
The only unfortunate thing was that till this day. There were no comprehensive learning aids. I have read many of the faqs, slide shows, tutorials and mailing list archives (that I could find on the internet). They have all been insightful and helpful but none of them have been complete.
The "Jini Specification" has been my first complete step into understanding how this new technology will change the way I think.
It has provided me with an introduction and overview of the general principles and components of Jini (Part 1 - Overview and Examples). This was complemented with what I think are very relevant and easy to understand examples (eg. chat room).
(This was something my friend and I were trying to implement as part of the learning experience. :)
It has also convinced me of the need to read the relevant Jini white papers by including them as Part 2 - The Jini Specification. I will continue to refer to this section until all the white papers are read and committed to memory. (just joking!)
"A Note on Distributed Computing" is Appendix A and it was my first time reading this report. I thought it reflected what I understood/assumed about local and distributed computing.
I realize that this is one of the first books (if not the first) on the topic of Jini and as such I have nothing else to compare it too. But, it has increased my understanding of Jini and distributed computing. This makes the book worthwhile in my mind.
Felix Tang, University of Toronto, Engineering Science
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