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Chapter 11. CDI Integration

11.1. CDI Integration
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To make use of jbpm-kie-services in your system, you will need to provide some mbeans to satisfy all dependencies of the services. There are several mbeans that depend on actual scenarios.
  • entity manager and entity manager factory
  • user group callback for human tasks
  • identity provider to pass authenticated user information to the services
When running in JEE environment, like JBoss Application Server, the mbean should satisfy all requirements of the jbpm-kie-services 
public class EnvironmentProducer { 

    @PersistenceUnit(unitName = "org.jbpm.domain")
    private EntityManagerFactory emf;

    @Inject
    @Selectable
    private UserGroupCallback userGroupCallback;

    @Produces
    public EntityManagerFactory getEntityManagerFactory() {
        return this.emf;
    }

    @Produces
    @RequestScoped
    public EntityManager getEntityManager() {
        EntityManager em = emf.createEntityManager();
        return em;
    }

    public void close(@Disposes EntityManager em) {
        em.close();
    }

    @Produces
    public UserGroupCallback produceSelectedUserGroupCalback() {
        return userGroupCallback;
    }
    @Produces

    public IdentityProvider produceIdentityProvider {
        return new IdentityProvider() {
             // implement IdentityProvider
        };
    }
}
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Then deployments/business-central.war/WEB-INF/beans.xml file may be configured to change the current settings of the new usergroupcallback implementation. 
<beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://docs.jboss.org/cdi/beans_1_0.xsd">

<alternatives>
  <class>org.jbpm.services.task.identity.JAASUserGroupCallbackImpl</class>
</alternatives>

</beans>
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Note

org.jbpm.services.task.identity.JAASUserGroupCallbackImpl is just an example here to demonstrate the settings of the application server regardless of what it actually is (LDAP, DB, etc).
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