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JBoss Weld CDI for Java Platform

JBoss Weld CDI for Java Platform

By : Kenneth Finnigan
3.9 (12)
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JBoss Weld CDI for Java Platform

JBoss Weld CDI for Java Platform

3.9 (12)
By: Kenneth Finnigan

Overview of this book

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.
Table of Contents (17 chapters)
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JBoss Weld CDI for Java Platform
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
1
Index

Chapter 5. Producers

In this chapter we will expand on producers, which were introduced back in Chapter 1, What is a Bean?, by covering their uses in greater detail. We will also see what scopes our produced beans are in and how to ensure that the beans we produce don't leave pieces of themselves behind when they're destroyed.

We've already learned how producers can be useful when we want to make runtime decisions about which bean instance should be used in a given situation. But there can be many situations where producers are beneficial, such as enabling third-party frameworks to be used with CDI by exposing their objects as beans.

Producers allow us to utilize runtime polymorphism, such as:

@SessionScoped
public class SearchManager implements java.io.Serializable {

  private SearchType searchType= SearchType.FICTION;

  @Produces
  @Preferred
  public BookSearch getSearch() {
    switch (searchType) {
      case FICTION:
        return new FictionSearch();
      case NONFICTION:
      ...
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