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public void addLoginInfo(LoginInfo loginInfo) { this.loginInfo = loginInfo; } public void addBiographicalInfo( BiographicalInfo biographicalInfo) { this.biographicalInfo = biographicalInfo; } public void addBillingInfo(BillingInfo billingInfo) { this.billingInfo = billingInfo; } @PrePassivate Receives PrePassivate callback @PreDestroy Receives PreDestroy public void cleanup() { callback try { connection.close(); connection = null; } catch (SQLException sqle) { sqle.printStackTrace(); } }

Views provides a default node view that simulates the default front page; this is perfect if you want to use a view as a homepage, which I highly recommend. This is a straightforward process of enabling the view and pointing your default front page to the view front page. Let s do it: 1. 2. First, go to the views homepage by navigating to Structure Views. Click the Enable button in the frontpage box; afterward, the box will look like Figure 7-16.

What this chapter covers:

@Remove public void cancelAccountCreation() { loginInfo = null; biographicalInfo = null; billingInfo = null; } @Remove

public void createAccount() { try { Statement statement = connection.createStatement(); statement.execute( "INSERT INTO BIDDERS(" + "username, " + ... "first_name, " + ... "credit_card_type, " + ... ") VALUES (" + " " + loginInfo.getUsername() + " , " + ... " " + biographicalInfo.getFirstName() + " , " + ... " " + billingInfo.getCreditCardType() + " , " + ... ")"); statement.close(); } catch (SQLException sqle) { sqle.printStackTrace(); } } } ... @Remote public interface BidderAccountCreator implements Remote { void addLoginInfo(LoginInfo loginInfo); void addBiographicalInfo(BiographicalInfo biographicalInfo); void addBillingInfo(BillingInfo billingInfo); void cancelAccountCreation(); void createAccount(); }

Defining the Silverlight MediaElement Comparing Silverlight versus Flash for video Building a Silverlight media player Parsing and de-serializing XML Turning XML into native Silverlight data objects Using the drag-and-drop Behavior Creating a singleton DataFactory Creating a custom UserControl

As we mentioned earlier, it should not surprise you that the code has a lot in common with the stateless session bean code in listing 3.1.

Figure 7-16. The frontpage view has been enabled. 3. 4. Next, navigate to Configuration Site information. Change the default front page to frontpage, as shown in Figure 7-17.

As before, we are using JDBC for simplicity in this example because we want you to focus on the session bean code right now and not JPA. We ll cover JPA in the part 3 of this book. An interesting exercise for you is to refactor this code using JPA and notice the radical improvement over JDBC!

Because Silverlight 4 was designed to develop rich Internet applications (RIAs) with lots of embedded media such as video and audio, the MediaElement is a very important and useful tool, so I have decided to dedicate an entire chapter to it. The Silverlight MediaElement is a rectangular UserControl that can be used to play audio or video. In the current version of Silverlight, the MediaElement supports the following types of media:

We are using the @Stateful annotation to mark the BidderAccountCreatorBean POJO b. Other than the annotation name, this annotation behaves exactly like the @Stateless annotation, so we won t mention it any further. The bean implements the BidderAccountCreator remote business interface. As per stateful bean programming rules, the BidderAccountCreatorBean has a no-argument constructor. Just like in listing 3.1, a JDBC data source is injected using the @Resource annotation. Both the PostConstruct D and PostPassivate E callbacks prepare the bean for use by opening a database connection from the injected data source. On the other hand, both the PrePassivate F and PreDestroy G callbacks close the cached connection. The loginInfo, biographicalInfo, and billingInfo instance variables are used to store client conversational state across business method calls C. Each of the business methods models a step in the account creation workflow and incrementally populates the state instance variables. The workflow is terminated when the client invokes either of the @Remove annotated methods H. There is no point to repeating our discussion of the features that are identical to the ones for stateless session beans, so we ll avoid doing so. However, let s explore the features unique to stateful session beans next, starting with the stateful bean business interfaces.

Figure 1.4 Most traditional enterprise applications have at least four layers. 1) The presentation layer is the actual user interface and can either be a browser or a desktop application. 2) The business logic layer defines the business rules. 3) The persistence layer deals with interactions with the database. 4) The database layer consists of a relational database such as Oracle that stores the persistent objects.