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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

Creating and enabling an interceptor


Now that we have the interceptor binding type, we need to implement the interceptor. All that's required is to create a standard interceptor and annotate it with @Interceptor and our interceptor binding type of @Audited:

@Audited
@Interceptor
public class AuditInterceptor {
  @AroundInvoke
  public Object auditMethod(InvocationContext ctx)
  throws Exception
  { ... }
}

CDI interceptors are also able to take full advantage of dependency injection like all beans in our application:

@Audited
@Interceptor
public class AuditInterceptor {

  @Inject
  AuditService service;

  @AroundInvoke
  public Object auditMethod(InvocationContext ctx)
  throws Exception
  { ... }
}

Now we're ready to enable our interceptor for our application. As all interceptors are disabled by default, we need to enable our interceptor within the beans.xml file of a bean archive:

<beans
  xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance...
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JBoss Weld CDI for Java Platform
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