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19.16. Indirect Service Invocation With Annotations

In the example below, annotations have been added to the bean called Order to manage invocation: 
@Named
@RequestScoped
public class Order implements Serializable {
 
    @Inject
    @Reference
    private OrderService orderService;
 
    private String orderId;
    private String itemId;
    private int quantity = 1;
 
    public String getOrderId() {
        return orderId;
    }
 
    public void setOrderId(String orderId) {
        this.orderId = orderId;
    }
 
    public String getItemId() {
        return itemId;
    }
 
    public void setItemId(String itemId) {
        this.itemId = itemId;
    }
 
    public int getQuantity() {
        return quantity;
    }
 
    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }
 
    public void create() {
        OrderAck serviceAck = orderService.submitOrder(this);
        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(serviceAck.toString()));
    }
}
  • Annotations @Named and @RequestScoped have been added.
  • The OrderService property has a @Reference annotation. Because of this, its instance is not a reference to the actual service implementation. Instead, it is a SwitchYard Exchange proxy to that service implementation. By using @Reference injected service references, backend service implementations can be non-CDI Bean service implementations.
  • Implementing the create method invokes the OrderService reference (exchange proxy).