shoppingclientcontrollerejb.java

一个优秀的供应商管理系统

package apusic.myshop.control.ejb;



import java.util.Collection;
import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.ejb.EJBException;
import javax.ejb.RemoveException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.ejb.FinderException;

import apusic.myshop.util.Debug;
import apusic.myshop.util.EJBUtil;
import apusic.myshop.cart.ejb.Cart;
import apusic.myshop.cart.ejb.CartHome;
import apusic.myshop.customer.ejb.Customer;
import apusic.myshop.customer.ejb.CustomerHome;

import apusic.myshop.control.event.BaseEvent;
import apusic.myshop.control.EventException;
import apusic.myshop.control.ejb.StateMachine;
import apusic.myshop.order.ejb.OrderHome;
import apusic.myshop.order.ejb.Order;

/**
 * Session Bean implementation for ShoppingClientController EJB.
 */
public class ShoppingClientControllerEJB implements SessionBean {

  private StateMachine sm;
  private SessionContext sc;
  private Cart cart;
  private Customer customer;

  public ShoppingClientControllerEJB() {}

  public Collection handleEvent(BaseEvent be)
    throws EventException {
    try {
      return (sm.handleEvent(be));
    } catch (RemoteException re) {
//      re.printStackTrace();
      throw new EJBException (re);
    }
  }

  public Collection getOrders(String userId)
	  throws FinderException {
    Collection orders = null;
	  try {
      OrderHome home = EJBUtil.getOrderHome();
      orders = home.findUserOrders(userId);
	  } catch (RemoteException re) {
	    throw new EJBException (re);
	  }
    return orders;
  }

  public Order getOrder(int requestId)
    throws FinderException {

    Order order = null;
    int orderId = sm.getOrderId(requestId);
    try {
        if (requestId != -1) {
          OrderHome home = EJBUtil.getOrderHome();
          order= home.findByOrderId(orderId);
        }
	  } catch (RemoteException re) {
	    throw new EJBException (re);
	  }
    return order;
  }


  /** @return the session EJB associated with this session. */
  public Cart getCart() {
    if (cart == null) {
      try {
        CartHome cartHome = EJBUtil.getCartHome();
        cart = cartHome.create();
      } catch (CreateException ce) {
        throw new EJBException(ce);
      } catch (RemoteException re) {
        throw new EJBException(re);
	    }
    }
    return cart;
  }

  public Customer getCustomer() {
    if (customer == null) {
      try {
        String userId = sc.getCallerPrincipal().getName();
        CustomerHome home = EJBUtil.getCustomerHome();
        customer = home.findByUserId(userId);
      } catch (FinderException fe) {
        throw new EJBException(fe);
      } catch (RemoteException re) {
        throw new EJBException(re);
	    }
    }
    return customer;
  }


  public void ejbCreate() {
    sm = new StateMachine(this);
  }

  public void setSessionContext(SessionContext sc) {
    this.sc = sc;
  }

  public void ejbRemove() {
    //sm = null;
    // this method will be called at the time of sign off.
    // destroy all the EJB's created by the shopping client
	  // controller.
    if (cart != null) {
      try {
        cart.remove();
        cart = null;
      } catch (RemoteException re) {
        throw new EJBException(re);
      } catch (RemoveException re) {
        throw new EJBException(re);
      }
    }
    //acct = null;
  }

  public void ejbActivate() {}

  public void ejbPassivate() {}

}