orderservice.java

来自「很好的电子商务系统」· Java 代码 · 共 99 行

package com.ibatis.jpetstore.service;

import com.ibatis.dao.client.DaoManager;
import com.ibatis.jpetstore.domain.LineItem;
import com.ibatis.jpetstore.domain.Order;
import com.ibatis.jpetstore.persistence.DaoConfig;
import com.ibatis.jpetstore.persistence.iface.ItemDao;
import com.ibatis.jpetstore.persistence.iface.OrderDao;
import com.ibatis.jpetstore.persistence.iface.SequenceDao;
import com.ibatis.common.util.PaginatedList;

import java.util.List;

/**
 * <p/>
 * Date: Mar 6, 2004 11:22:36 PM
 * 
 * @author Clinton Begin
 */
public class OrderService {

  /* Constants */

  private static final OrderService instance = new OrderService();

  /* Private Fields */

  private DaoManager daoManager = DaoConfig.getDaomanager();

  private ItemDao itemDao;
  private OrderDao orderDao;
  private SequenceDao sequenceDao;

  /* Constructors */

  public OrderService() {
    itemDao = (ItemDao) daoManager.getDao(ItemDao.class);
    sequenceDao = (SequenceDao) daoManager.getDao(SequenceDao.class);
    orderDao = (OrderDao) daoManager.getDao(OrderDao.class);
  }

  /* Public Methods */

  public static OrderService getInstance() {
    return instance;
  }

  /* ORDER */

  public void insertOrder(Order order) {
    try {
      // Get the next id within a separate transaction
      order.setOrderId(getNextId("ordernum"));

      daoManager.startTransaction();

      itemDao.updateQuantity(order);
      orderDao.insertOrder(order);

      daoManager.commitTransaction();
    } finally {
      daoManager.endTransaction();
    }
  }

  public Order getOrder(int orderId) {
    Order order = null;

    try {
      daoManager.startTransaction();

      order = orderDao.getOrder(orderId);

      for (int i = 0; i < order.getLineItems().size(); i++) {
        LineItem lineItem = (LineItem) order.getLineItems().get(i);
        lineItem.setItem(itemDao.getItem(lineItem.getItemId()));
      }

      daoManager.commitTransaction();
    } finally {
      daoManager.endTransaction();
    }

    return order;
  }

  public PaginatedList getOrdersByUsername(String username) {
    return orderDao.getOrdersByUsername(username);
  }

  /* SEQUENCE */

  public synchronized int getNextId(String key) {
    return sequenceDao.getNextId(key);
  }


}