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Most Java web applications use some kind of Model/View/Controller (MVC) application framework; even many that use plain servlets follow the MVC pattern by using templating to implement the presentation code, separating application control logic into a servlet or multiple servlets. You ll now write such a controller servlet that implements the previously introduced use case. With an MVC approach, you write the code that implements the place bid use case in an execute() method of an action named PlaceBidAction. Assuming some kind of web framework, we don t show how to read request parameters or how to forward to the next page. The code shown may even be the implementation of a doPost() method of a plain servlet. The first attempt at writing such a controller, shown in listing 16.1, mixes all concerns in one place there are no layers.

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15

public void execute() { Long itemId = ... Long userId = ... BigDecimal bidAmount = ... Transaction tx = null; try { // Get value from request // Get value from request // Get value from request

You should designate one notebook computer to have the Internet connection. On that computer, you should connect the Ethernet cable to the built-in network adapter. You should then open the Properties dialog box for the LAN connection. In the Local Area Connection Properties dialog box, on the General tab, you should select the Internet Protocol (TCP/IP) component, and then click Properties to open the Internet Protocol (TCP/IP) Properties dialog box. You should configure the computer to obtain an IP address automatically.

4. After successfully establishing the Internet connection for the selected notebook computer, how would you enable ICS on the host computer

Session session = HibernateUtil.getSessionFactory().getCurrentSession(); tx = session.beginTransaction(); // Load requested Item

You would open the Properties dialog box for the local area connection that represents the Internet connection. On the Advanced tab of the Properties dialog box, you should select the Allow Other Network Users To Connect Through This Computer s Internet Connection check box.

5. After enabling Internet Connection Sharing, what IP address will the host computer assign itself for the wireless network connection on the private network

Item item = (Item) session.load(Item.class, itemId); // Check auction still valid if ( item.getEndDate().before( new Date() ) ) { ... // Forward to error page }

You should open the Properties dialog box for the wireless connection on each of the other notebook computers and ensure that the connection is configured to obtain an IP address automatically. The computers will obtain IP addresses from the host computer.

7. What range of IP addresses would you expect to see for the wireless network connections on the other notebook computers

// Check amount of Bid Query q = session.createQuery("select max(b.amount)" + " from Bid b where b.item = :item"); q.setEntity("item", item); BigDecimal maxBidAmount = (BigDecimal) q.uniqueResult(); if (maxBidAmount.compareTo(bidAmount) > 0) { ... // Forward to error page } // Add new Bid to Item User bidder = (User) session.load(User.class, userId); Bid newBid = new Bid(bidAmount, item, bidder); item.addBid(newBid);

establish policies that delegate authority, accountability, and responsibility for the outcome of IT projects.

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Windows XP Professional includes a feature named Fast Logon Optimization. Enabled by default, this feature allows existing users to log on by using cached credentials instead of waiting for the network to become fully initialized before allowing logon. This features enables faster logons from the user perspective. Group Policy and other settings are applied in the background after logon and after the network is initialized. Fast Logon Optimization is always turned off in the following situations:

} catch (RuntimeException ex) { if (tx != null) tx.rollback(); throw ex; } }

The first time a user logs on to a computer When a user logs on using a roaming profile, a home directory, or a user logon script (you will learn more in 7)

To log off a computer running Windows XP Professional, click Start and then click Log Off. Notice that the Start menu, shown in Figure 1-9, also allows you to turn off the computer.