OrderManagerImpl.java

package org.books.business;

import org.books.dao.OrderDao;
import org.books.domain.Address;
import org.books.domain.LineItem;
import org.books.domain.Order;
import org.books.domain.PaymentInfo;

import javax.annotation.Resource;
import javax.ejb.EJB;
import javax.ejb.Stateless;
import javax.jms.*;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import java.util.List;

@Stateless
public class OrderManagerImpl implements OrderManager {

    @PersistenceContext(unitName = "bookstore")
    EntityManager entityManager;

    @Resource
    ConnectionFactory connectionFactory;
    @Resource(name = "OrderProcessor")
    Queue orderQueue;
    @EJB
    private OrderDao orderDao;
    @EJB
    private PriceCalculator priceCalculator;

    public void createOrder(List<LineItem> lineItems, Address address, PaymentInfo paymentInfo) throws Exception {

        double price = priceCalculator.getTotalPrice(lineItems, address, paymentInfo);

        Order order = new Order();
        for (LineItem lineItem : lineItems) {
            order.getLineItems().add(lineItem);
        }
        order.setPrice(price);

        orderDao.addOrder(order);

        sendOrder(order.getId());
    }

    public void sendOrder(long orderId) throws JMSException {

        Connection connection = null;
        Session session = null;

        try {
            connection = connectionFactory.createConnection();
            connection.start();

            // Create a Session
            session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

            // Create a MessageProducer from the Session to the Topic or Queue
            MessageProducer producer = session.createProducer(orderQueue);
            producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);

            // Create a message
            TextMessage message = session.createTextMessage(Long.toString(orderId));

            // Tell the producer to send the message
            producer.send(message);
        } finally {
            // Clean up
            if (session != null)
                session.close();
            if (connection != null)
                connection.close();
        }
    }

}