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share the assembly that contains the data type definitions. For example, you will not be able to reference the StockTraderTypes assembly directly if you build your client application using Java. For these cases, you can rely on the data types exposed by the autogenerated proxy class. As you will see later, we will be using the Quote object exposed by the proxy class and not the one provided by the StockTraderTypes assembly. This approach has an important benefit, which is that you do not need to redistribute the data types DLL to your client applications. Keep in mind that using this approach does not mean that the developers building the Web service are free to change the data type definitions at any time. If they do this, they will generate compatibility issues between the client and the service. Having this flexibility doesn t exempt a developer from carefully managing changes to the definition of a Web service.

@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(); }

However, using native pointers would not be sufficient here. Since managed arrays are instantiated on the managed heap, where they can be relocated to defragment the managed heap, a special kind of pointer is necessary. Like a tracking handle, pointers of this type need to be updated when the managed array is moved. However, the tracking handle would not be sufficient either. As you can see in Figure 2-4, a tracking handle always refers to a managed object s header. The pointer type needed here should refer to an object s data area. For this new pointer concept, a template-like syntax is used. The keyword interior_ptr intends to make clear that this managed pointer concept refers to an object s data, not to an object s header. To differentiate a tracking handle from an interior pointer, a tracking handle is sometimes called whole-object pointer. Figure 2-5 shows the difference between a tracking handle and an interior pointer.

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.

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!

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.