CDI events

CDI provides event handling facilities. Events allow loosely-coupled communication between different CDI beans. A CDI bean can fire an event, then one or more event listeners handle the event.

Firing CDI events

The following example is a new version of the CustomerInfoController class we discussed in the previous section. The class has been modified to fire an event every time the user navigates to a new page:

package net.ensode.javaee8book.cdievents.controller; 
 
import java.io.Serializable; 
import javax.enterprise.context.Conversation; 
import javax.enterprise.context.RequestScoped; 
import javax.enterprise.event.Event; 
import javax.inject.Inject; 
import javax.inject.Named; 
import net.ensode.javaee8book.cdievents.event.NavigationInfo; 
import net.ensode.javaee8book.cdievents.model.Customer; 
 
@Named 
@RequestScoped 
public class CustomerInfoController implements Serializable { 
 
    @Inject 
    private Conversation conversation; 
    @Inject 
    private Customer customer...