shoppingfacadeejb.java

《J2EE企业级应用开发》一书的配套源代码

package com.j2eeapp.cdstore.cart;

import com.j2eeapp.cdstore.customer.*;
import com.j2eeapp.cdstore.servicelocator.*;
import java.rmi.RemoteException;
import javax.ejb.*;
import com.j2eeapp.cdstore.util.*;
public class ShoppingFacadeEJB implements SessionBean
{
    /**
     * Attributes declaration
    */
    public SessionContext EJB_Context = null;
    private String userId;
    private ShoppingCart cart;
    private CustomerLocal customer;
    
    /**
     * @J2EE_METHOD  --  ShoppingFacadeEJB
     */
    public ShoppingFacadeEJB    ()  
    { 

    }
    
    /**
     * @J2EE_METHOD  --  ejbCreate
     * Called by the container to create a session bean instance. Its parameters typically
     * contain the information the client uses to customize the bean instance for its use.
     * It requires a matching pair in the bean class and its home interface.
     */
    public void ejbCreate    ()  
    { 

    }
    
    /**
     * @J2EE_METHOD  --  ejbRemove
     * A container invokes this method before it ends the life of the session object. This
     * happens as a result of a client's invoking a remove operation, or when a container
     * decides to terminate the session object after a timeout. This method is called with
     * no transaction context.
     */
    public void ejbRemove    ()  
    { 

    }
    
    /**
     * @J2EE_METHOD  --  ejbActivate
     * The activate method is called when the instance is activated from its 'passive' state.
     * The instance should acquire any resource that it has released earlier in the ejbPassivate()
     * method. This method is called with no transaction context.
     */
    public void ejbActivate    ()  
    { 

    }
    
    /**
     * @J2EE_METHOD  --  ejbPassivate
     * The passivate method is called before the instance enters the 'passive' state. The
     * instance should release any resources that it can re-acquire later in the ejbActivate()
     * method. After the passivate method completes, the instance must be in a state that
     * allows the container to use the Java Serialization protocol to externalize and store
     * away the instance's state. This method is called with no transaction context.
     */
    public void ejbPassivate    ()  
    { 

    }
    
    /**
     * @J2EE_METHOD  --  setSessionContext
     * Set the associated session context. The container calls this method after the instance
     * creation. The enterprise Bean instance should store the reference to the context
     * object in an instance variable. This method is called with no transaction context.
     */
    public void setSessionContext    (SessionContext sc)  
    { 
		this.EJB_Context=sc;
    }
    
    /**
     * @J2EE_METHOD  --  setUserId
     */
    public void setUserId    (String userId)  
    { 
		 this.userId = userId;
    }
    
    /**
     * @J2EE_METHOD  --  getUserId
     */
    public String getUserId    ()  
    { 
		return userId;
 
    }
    
    /**
     * @J2EE_METHOD  --  getShoppingCart
     */
    public ShoppingCart getShoppingCart    ()  
    { 
		 if (cart == null) {
            try {
                EJBServiceLocator sl = new EJBServiceLocator();
                ShoppingCartHome home =(ShoppingCartHome)sl.getRemoteHome(JNDINames.SHOPPING_CART,ShoppingCartHome.class);
                cart = home.create();
            } catch (javax.ejb.CreateException cx) {
                System.out.println("ShoppingClientFacade: failed to create cart: caught " + cx);
            } catch (ServiceLocatorException slx) {   
                System.out.println("ShoppingClientFacade: failed to look up name of cart: caught " + slx);
            }
            catch(RemoteException e)
            {
            	System.out.println(e.getMessage());
            }
        }
        return cart;
  
    }
    
    /**
     * @J2EE_METHOD  --  getCustomer
     */
    public CustomerLocal getCustomer    ()  
    { 
		 if (userId == null) {
                System.out.println("ShoppingClientFacade: failed to look up name of customer: userId is not set" );
            }
            try {
                EJBServiceLocator sl = new EJBServiceLocator();
                CustomerLocalHome home =(CustomerLocalHome)sl.getLocalHome(JNDINames.CUSTOMER);
                customer = home.findByPrimaryKey(userId);
            } catch (ServiceLocatorException slx) {   
                System.out.println("ShoppingClientFacade: failed to look up name of customer: caught " + slx);
            }
            catch(FinderException e)
            {
            	System.out.println("can't find customer"+userId+e.getMessage());
            }
        return customer;
   
    }
    
    /**
     * @J2EE_METHOD  --  createCustomer
     */
    public CustomerLocal createCustomer    ()  
    { 
 		 try {
                EJBServiceLocator sl = new EJBServiceLocator();
                CustomerLocalHome home =(CustomerLocalHome)sl.getLocalHome(JNDINames.CUSTOMER);
                customer = home.create(userId);
                this.userId = userId;
            } catch (javax.ejb.CreateException ce) {
                System.out.println("ShoppingClientFacade: failed to create customer: caught " + ce);
            } catch (ServiceLocatorException slx) {   
                System.out.println("ShoppingClientFacade: failed to look up name of customer: caught " + slx);
            }
        return customer;
 
    }
}