23,99 €
Mehr erfahren.
- Herausgeber: Packt Publishing
- Kategorie: Fachliteratur
- Sprache: Englisch
CDI simplifies dependency injection for modern application developers by taking advantage of Java annotations and moving away from complex XML, while at the same time providing an extensible and powerful programming model.
"JBoss Weld CDI for Java Platform" is a practical guide to CDI's dependency injection concepts using clear and easy-to-follow examples. This will help you take advantage of the power behind CDI, as well as providing a firm understanding of how to use it within your applications.
"JBoss Weld CDI for Java Platform" covers all the major aspects of CDI, breaking it down into understandable pieces. This book will take you through many examples of how these concepts can be utilized, helping you get up and running quickly and painlessly.
"JBoss Weld CDI for Java Platform" gives you an insight into the different scopes provided by CDI and the use cases for which each has been designed. You will learn everything about dependency injection, scopes, events, producers, and more from JBoss Weld CDI, as well as how producers can create new beans for consumption within your application. You will also learn how to build a real world application with CDI using JSF and AngularJS for different web interfaces.
Das E-Book können Sie in Legimi-Apps oder einer beliebigen App lesen, die das folgende Format unterstützen:
Seitenzahl: 127
Veröffentlichungsjahr: 2013
Ähnliche
Table of Contents
JBoss Weld CDI for Java Platform
JBoss Weld CDI for Java Platform
Copyright © 2013 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: July 2013
Production Reference: 1050713
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham B3 2PB, UK.
ISBN 978-1-78216-018-2
www.packtpub.com
Cover Image by Timappa Shetty (<[email protected]>)
Credits
Author
Ken Finnigan
Reviewer
George Gastaldi
Acquisition Editor
Usha Iyer
Commissioning Editor
Llewellyn F. Rozario
Meeta Rajani
Technical Editors
Sampreshita Maheshwari
Veena Pagare
Copy Editors
Aditya Nair
Alfida Paiva
Laxmi Subramanian
Project Coordinator
Michelle Quadros
Proofreader
Maria Gould
Indexer
Priya Subramani
Production Coordinator
Aditi Gajjar
Cover Work
Aditi Gajjar
About the Author
Ken Finnigan is a Senior Software Engineer at Red Hat, technical lead of the JBoss Portlet Bridge project, a member of the GateIn development team, and the founder of the Arquillian Portal Extension. As a consultant and engineer he has over 15 years development experience with enterprises throughout the world using technologies that include Java EE frameworks (JSF, CDI, EJB3, Hibernate, and Seam), Java testing frameworks (Arquillian, JUnit, and TestNG), Maven, Ant, and a variety of others. In his spare time, he is a committer for Apache DeltaSpike, ShrinkWrap, and Arquillian. He is also the author of GateIn Cookbook, Packt Publishing.
I'd like to thank my wonderful wife, Erin, and my family for all their support and understanding through the entire book development process. I'd also like to thank George Gastaldi for agreeing to review the book.
About the Reviewer
George Gastaldi is a Senior Software Engineer from Brazil working at RedHat, notably as a core developer for the JBoss Forge project. He is also the leader of Seam 3 Reports and the co-leader of the Seam 3 JCR module. George has been working professionally with Java since 2000. In 2006, George joined Apache as an individual committer to work on Apache ServiceMix (an open source JBI-compliant ESB). George is a JCP individual member and also a member of the CDI 1.1 spec team. He also promotes Java technology by giving speeches at Brazilian conferences, such as JUDCon Brazil 2013 and The Developer's Conference 2012.
I wish to thank my wife Estéfany de Souza Gastaldi for supporting me during long nights, my parents Gilberto and Noeli Gastaldi, my sister Alessandra, and God for giving me the needed strength and faith.
www.PacktPub.com
Support files, eBooks, discount offers and more
You might want to visit www.PacktPub.com for support files and downloads related to your book.
Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? You can upgrade to the eBook version at www.PacktPub.com and as a print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at <[email protected]> for more details.
At www.PacktPub.com, you can also read a collection of free technical articles, sign up for a range of free newsletters and receive exclusive discounts and offers on Packt books and eBooks.
http://PacktLib.PacktPub.com
Do you need instant solutions to your IT questions? PacktLib is Packt's online digital book library. Here, you can access, read and search across Packt's entire library of books.
Why Subscribe?
Free Access for Packt account holders
If you have an account with Packt at www.PacktPub.com, you can use this to access PacktLib today and view nine entirely free books. Simply use your login credentials for immediate access.
Preface
The CDI specification standardized the process of dependency injection for Java EE, opening the door to efficient integration with components and frameworks for your applications. JBoss Weld is the open source reference implementation for CDI that simplifies the development of applications with dependency injection.
JBoss Weld CDI for Java Platform will explain dependency injection with JBoss Weld and how you can use it to ensure that your applications take advantage of type safety, making your applications easier to debug and maintain. It is filled with information on what scopes CDI provides for your applications, how to fire and listen to events, creating new beans with producers, interceptors, and decorators, and developing portable extensions.
JBoss Weld CDI for Java Platform will have you up and running with CDI on JBoss Weld in a short space of time. Once we've covered the main topics of CDI, we will develop a simple application using CDI services with REST endpoints that we connect to from JSF and AngularJS.
What this book covers
Chapter 1, What is a Bean?, provides an overview of CDI beans and their history, before explaining how a Java class can be a bean.
Chapter 2, Dependency Injection and Lookup, explains injection and lookup functions, by understanding qualifiers and injection points. We also cover some possible Weld dependency errors and how our beans are proxied.
Chapter 3, Deploying JBoss Weld, covers how to deploy JBoss Weld to JBoss AS, GlassFish, and Tomcat.
Chapter 4, Scopes and Contexts, explains the scopes that are provided by CDI and how they should be used. We also explain pseudo scopes and creating a custom scope.
Chapter 5, Producers, covers producer methods and fields, injecting into producer methods, and how we can clean up beans that we produce.
Chapter 6, Interceptors and Decorators, explains how to create and enable an interceptor, and how their bindings are defined. We also look at enabling decorators and what is a decorator delegate.
Chapter 7, Events, explains how to listen for and fire events, and what type of payload can be sent. We also explain advanced event qualifiers and how to listen for events during specific transaction phases.
Chapter 8, Writing a Portable Extension, explains how to create an extension to CDI and what events the container fires that we can utilize. We then cover some examples of what can be achieved within an extension.
Chapter 9, Book Store – CDI Services, covers the development of CDI services, REST endpoints, and communicating with a database for our example application.
Chapter 10, Book Store – User Interfaces, explains how to develop a JSF admin interface and a user interface using AngularJS for our example application that will interact with our services.
What you need for this book
To be able to run the examples from this book, you should have:
Who this book is for
This book is for anyone wanting to understand what CDI 1.0 is and how it can be used to benefit an application's architecture. Experience with Java is required, but only so far as is needed to understand the coding constructs of the language. RESTful architecture, AngularJS, and Java Server Faces (JSF) skills are suggested, though not essential.
Reader feedback
Feedback from our readers is always welcome. Let us know what you think about this book—what you liked or may have disliked. Reader feedback is important for us to develop titles that you really get the most out of.
To send us general feedback, simply send an e-mail to <[email protected]>, and mention the book title via the subject of your message.
If there is a topic that you have expertise in and you are interested in either writing or contributing to a book, see our author guide on www.packtpub.com/authors.
Customer support
Now that you are the proud owner of a Packt book, we have a number of things to help you to get the most from your purchase.
Downloading the example code
You can download the example code files for all Packt books you have purchased from your account at http://www.packtpub.com. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files e-mailed directly to you.
Errata
Although we have taken every care to ensure the accuracy of our content, mistakes do happen. If you find a mistake in one of our books—maybe a mistake in the text or the code—we would be grateful if you would report this to us. By doing so, you can save other readers from frustration and help us improve subsequent versions of this book. If you find any errata, please report them by visiting http://www.packtpub.com/submit-errata, selecting your book, clicking on the errata submission form link, and entering the details of your errata. Once your errata are verified, your submission will be accepted and the errata will be uploaded on our website, or added to any list of existing errata, under the Errata section of that title. Any existing errata can be viewed by selecting your title from http://www.packtpub.com/support.
Piracy
Piracy of copyright material on the Internet is an ongoing problem across all media. At Packt, we take the protection of our copyright and licenses very seriously. If you come across any illegal copies of our works, in any form, on the Internet, please provide us with the location address or website name immediately so that we can pursue a remedy.
Please contact us at <[email protected]> with a link to the suspected pirated material.
We appreciate your help in protecting our authors, and our ability to bring you valuable content.
Questions
You can contact us at <[email protected]> if you are having a problem with any aspect of the book, and we will do our best to address it.
Chapter 1. What is a Bean?
This chapter will introduce us to beans and their history prior to Contexts and Dependency Injection (CDI) becoming a part of Java Enterprise Edition (Java EE). After a short history, we will define what a bean is and what characteristics and behavior a Java class requires to be considered a bean.
Note
JSR-299: Contexts and Dependency Injection for the Java EE platform was finalized in December 2009. CDI 1.1 is due to be released in the first half of 2013 to coincide with the release of Java EE 7.
The history of beans
Beans have been used to refer to many different kinds of Java classes over the years. The oldest use of a bean is from 1996, when Sun introduced JavaBeans as a term for a reusable software component for Java that defined a series of rules as to how a Java class should be developed. Those original rules have become ubiquitous to the point that the term JavaBeans is rarely, if ever, used anymore.
Since that initial use of the bean in 1996, there have been many uses of the term in third-party frameworks such as Seam and Spring. The term was also used in EE specifications for Enterprise JavaBeans (EJBs) and Java Server Faces (JSF) where they were called Managed Beans. Even though the term "bean" had been used by various specifications within the Java EE platform, there was never a consistent or clear definition of what a bean is made of and how it could be utilized.
