The Java Embedded Server™ from Sun Microsystems, Inc., is a solution for linking consumer devices with services over the Internet. It is based on the Open Services Gateway Initiative (OSGi) Service Gateway Specification 1.0. Written by authors who are intimately involved with the development and implementation of the specification, Programming Open Service Gateways with Java Embedded Server™ Technology reveals the concepts and inner workings of the Java Embedded Server framework and explains how to program and develop services for open gateways using the Java™ programming language.
With an emphasis on actual coding, this definitive guide begins by explaining the backdrop in which the residential gateway market emerged. Next, the book discusses the history and mission of the Java Embedded Server product and the OSGi consortium. Throughout the book, the Java Embedded Server technical architecture and the OSGi Service Gateway API are presented with examples and detailed implementations. The book's practical, how-to format shows you how to write code for residential gateway applications that is correct, robust, and efficient while avoiding common traps and pitfalls.
Programming Open Service Gateways with Java Embedded Server™ Technology gives you an insider's perspective on the development process of new applications and services for the residential gateway environment.
Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.
Kirk Chen, a Staff Engineer at Sun Microsystems, has worked on design and implementation of the Java Embedded Server product since its inception. He has an M.S. in computer science from Stanford University.
Li Gong is managing director of Sun Microsystems' Engineering and Research Institute in Beijing, China. Previously at Sun, he was engineering head of Java Security and Networking, Java Embedded Servers, and JXTA. He obtained B.S. and M.S. degrees from Tsinghua University, Beijing, and a Ph.D. from the University of Cambridge. He is associate editor-in-chief of IEEE Internet Computing.Excerpt. © Reprinted by permission. All rights reserved. :
Technology is invented and advanced by, well, technical people. However, a truly successful technology is marked by its adoption by people in their daily lives. Few ponder radio frequency modulation when they turn on the TV, or the internal combustion engine when they drive around. The technology has disappeared behind the utility.
The last decade saw two new technologies begin to blend into our lives: the computer and the Internet. We only need to launch a browser and the resources of the World Wide Web are at our fingertips, and we are hard pressed to tell the difference between a computer and a game console, a personal digital assistant (such as PalmPilot), or a cell phone. It is now entirely feasible to bring services to smart consumer devices at home and to small businesses through the Internet. Utility providers and network, computer, wireless, consumer electronics, and home appliance companies recognize the tremendous potential and have started to tap into this market. As a result, new horizons are open for application developers.
The Open Services Gateway Initiative (OSGi) was formed to explore these exciting opportunities, and its membership includes such diverse companies as Bell South, Echelon, Electricite de France, IBM, Sun, Ericsson, Nokia, Sony, Maytag, and Whirlpool, to name just a few from a roster of more than 80 organizations. With these combined resources, OSGi stands a good chance to turn this vision into reality.
The OSGi Service Gateway Specification 1.0 defines a Java™ technology-based software architecture for developing and deploying services, which is the topic of this book.
What compels us to write this book, in addition to our enthusiasm for the emerging new applications, is the unique software model involved. We stumbled through a lot of unfamiliar territory ourselves when we worked on the Java Embedded Server™ product, the predecessor to the OSGi Service Gateway Specification, only to find our fellow developers encountering and struggling with the same class of problems. It is our hope to be able to elucidate the model and capture the hard-won solutions in one place.
This book is primarily for programmers interested in writing services for residential gateways in the Java programming language. It should also be useful to anyone who wants to learn about residential gateway technology and the efforts made by the OSGi consortium.This book may be of interest to those who are involved with component-based software construction in general. Interestingly, nothing in the underlying programming model limits the kinds of applications that can be written. It aims at residential gateway applications at the "small" end of the spectrum in terms of code size and resource consumption, but it is just as viable for developing applications for desktop and enterprise environments. Indeed, the task will be made easier and the end result will be more powerful when fewer constraints on computing resources are imposed.
We assume the readers are well versed in the Java programming language and experienced in software development on the Java platform. However, no experience is needed in embedded systems at the hardware and operating system levels.
Many trade-offs on the contents of the book had to be considered, and these were not easy decisions to make. We wrote this book with the following goals in mind:
Organization of the Book
You can read this book from cover to cover, or you can select the chapters that address your particular needs. For the impatient, it is possible to jump to Chapter 4 and try out the code in action, because clear step-by-step instructions are given. However, you are strongly encouraged to read Chapter 3, which puts things into context.
Chapter 1 describes the backdrop from which the residential gateway market emerged, and its propellants and challenges, then explains the history of the Java Embedded Server product and the OSGi consortium, and introduces our view of what OSGi is trying to achieve.
Chapter 2 outlines steps to develop your first bundle and familiarizes you with the Java Embedded Server execution environment.
Chapter 3 explains the OSGi architecture and basic concepts, including the interaction of various entities during interbundle class sharing, service registration and retrieval, and bundle life cycle operations.
Chapter 4 teaches you how to develop services, how to write library bundles, and how to include native code in your bundles. Two advanced examples are given in this chapter.
Chapter 5 analyzes the dynamic nature of cooperation with services, and proposes strategies to cope with the situation. Events are also discussed at the beginning of this chapter.
Chapter 6 describes design patterns and pitfalls.
Chapter 7 explains how to use the OSGi standard services: HTTP and Log services.
Chapter 8 explains the OSGi Device Access (DA) and how to develop services to communicate with devices using the DA.
Chapter 9 discusses permission-based security and administration.
Chapter 10 summarizes the issues being worked and our view of the future directions that the OSGi consortium could take.
Appendix A contains the complete source code of the examples in this book.
Appendix B is a copy of the OSGi specification. A list of references is included at the end of the book.
A copy of the Java Embedded Server product can be downloaded from Sun Microsystems' Web site athttp://www.sun.com/software/embeddedserver
For updated information about the book, visit the following URL:http://java.sun.com/docs/books/jes
Full details of the OSGi consortium can be found at http://www.osgi.org
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Description du livre Addison-Wesley Professional, 2001. Paperback. État : New. book. N° de réf. du libraire 0201711028
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