petstore中的machine是怎麼回事？

wmghost發表於2004-08-05
Mac
見作記號處，有
scf = (ShoppingClientFacadeLocal) machine.getAttribute(PetstoreKeys.SHOPPING_CLIENT_FACADE);
一句，其中的machine從何而來？

原始碼如下：



package com.sun.j2ee.blueprints.petstore.controller.ejb.actions;

import java.util.Collection;
import java.util.Iterator;
import java.util.Date;
import java.util.Locale;

// J2EE imports
import javax.ejb.CreateException;
import javax.naming.NamingException;

// WAF imports
import com.sun.j2ee.blueprints.waf.event.Event;
import com.sun.j2ee.blueprints.waf.event.EventResponse;
import com.sun.j2ee.blueprints.waf.event.EventException;
import com.sun.j2ee.blueprints.waf.controller.ejb.action.EJBActionSupport;

// po component imports
import com.sun.j2ee.blueprints.purchaseorder.ejb.PurchaseOrder;
import com.sun.j2ee.blueprints.lineitem.ejb.LineItem;
import com.sun.j2ee.blueprints.xmldocuments.XMLDocumentException;
import com.sun.j2ee.blueprints.petstore.controller.events.OrderEvent;
import com.sun.j2ee.blueprints.contactinfo.ejb.ContactInfo;
import com.sun.j2ee.blueprints.creditcard.ejb.CreditCard;

// async component imports
import com.sun.j2ee.blueprints.asyncsender.ejb.AsyncSenderLocalHome;
import com.sun.j2ee.blueprints.asyncsender.ejb.AsyncSender;

// unidue id generator imports
import com.sun.j2ee.blueprints.uidgen.ejb.UniqueIdGeneratorLocal;
import com.sun.j2ee.blueprints.uidgen.ejb.UniqueIdGeneratorLocalHome;

// shoppingcart component imports
import com.sun.j2ee.blueprints.cart.ejb.ShoppingCartLocal;
import com.sun.j2ee.blueprints.cart.model.CartItem;

// service locator imports
import com.sun.j2ee.blueprints.servicelocator.ejb.ServiceLocator;
import com.sun.j2ee.blueprints.servicelocator.ServiceLocatorException;

// petstore imports
import com.sun.j2ee.blueprints.petstore.util.JNDINames;
import com.sun.j2ee.blueprints.petstore.util.PetstoreKeys;
import com.sun.j2ee.blueprints.petstore.controller.ejb.ShoppingClientFacadeLocal;
import com.sun.j2ee.blueprints.petstore.controller.events.OrderEvent;
import com.sun.j2ee.blueprints.petstore.controller.events.OrderEventResponse;
import com.sun.j2ee.blueprints.petstore.controller.exceptions.ShoppingCartEmptyOrderException;

public class OrderEJBAction
extends EJBActionSupport {

public EventResponse perform(Event e)
throws EventException {
OrderEvent oe = (OrderEvent) e;
PurchaseOrder purchaseOrder = new PurchaseOrder();
ContactInfo billTo = oe.getBillTo();
ContactInfo shipTo = oe.getShipTo();
CreditCard creditCard = oe.getCreditCard();
String orderIdString = null;

// get the UniqueIdGenerator EJB
UniqueIdGeneratorLocal uidgen = null;
try {
ServiceLocator sl = new ServiceLocator();
UniqueIdGeneratorLocalHome home = (UniqueIdGeneratorLocalHome) sl.getLocalHome(JNDINames.UIDG_EJBHOME);
uidgen = home.create();
} catch (javax.ejb.CreateException cx) {
cx.printStackTrace();
} catch (ServiceLocatorException slx) {
slx.printStackTrace();
}
orderIdString = uidgen.getUniqueId("1001");
// get ther userId
ShoppingClientFacadeLocal scf = null;


//here **********************************************************


scf = (ShoppingClientFacadeLocal) machine.getAttribute(PetstoreKeys.SHOPPING_CLIENT_FACADE);


//here **********************************************************

String userId = scf.getUserId();
purchaseOrder.setOrderId(orderIdString);
purchaseOrder.setUserId(userId);
purchaseOrder.setEmailId(billTo.getEmail());
purchaseOrder.setOrderDate(new Date());
purchaseOrder.setShippingInfo(shipTo);
purchaseOrder.setBillingInfo(billTo);
purchaseOrder.setCreditCard(creditCard);
int lineItemCount = 0;
float totalCost = 0;
// Add the items from the shopping cart
ShoppingCartLocal cart = scf.getShoppingCart();
Locale locale = (Locale) machine.getAttribute(PetstoreKeys.LOCALE);

purchaseOrder.setLocale(locale);
Collection items = cart.getItems();
// if the cart is empty throw an exception saying so
if (items.size() == 0) {
throw new ShoppingCartEmptyOrderException("Shopping cart is empty");
}
Iterator it = items.iterator();
while (it.hasNext()) {
CartItem item = (CartItem) it.next();

float cost = new Float(item.getUnitCost()).floatValue();
totalCost += (cost * item.getQuantity());
purchaseOrder.addLineItem(new LineItem(item.getCategory(), item.getProductId(), item.getItemId(),
(lineItemCount++) + "", item.getQuantity(), cost));
}
purchaseOrder.setTotalPrice(totalCost);
try {
ServiceLocator sl = new ServiceLocator();
AsyncSenderLocalHome home = (AsyncSenderLocalHome) sl.getLocalHome(JNDINames.ASYNCSENDER_LOCAL_EJB_HOME);

AsyncSender sender = home.create();
sender.sendAMessage(purchaseOrder.toXML());

} catch (ServiceLocatorException sle) {
sle.printStackTrace();
// throw new AdminBDException(sle.getMessage());
} catch (XMLDocumentException xde) {
xde.printStackTrace();
System.err.println(xde.getRootCause().getMessage());
// throw new EventResponse or whatever
} catch (CreateException ce) {
//throw new AdminBDException(ce.getMessage());
}

// empty the shopping cart
cart.empty();
return new OrderEventResponse(billTo.getEmail(), orderIdString);
}
}

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