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Stateful session beans
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Figure 3.7 The ActionBazaar bidder account creation process is broken up into multiple steps: entering username/password, entering biographical information, entering billing information, and finally creating the account. This workflow could be implemented as a stateful session bean.
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Each step of the workflow is implemented as a method of the BidderAccountCreatorBean presented in listing 3.2. Data gathered in each step is incrementally cached into the stateful session bean as instance variable values. Calling either the cancelAccountCreation or createAccount method ends the workflow. The createAccount method creates the bidder account in the database and is supposed to be the last normal step of the workflow. The cancelAccountCreation method, on the other hand, prematurely terminates the process when called by the client at any point in the workflow and nothing is saved into the database. The full version of the code is available for download in the zip containing code examples from this book s website.
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Listing 3.2 Stateful session bean example
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@Stateful(name="BidderAccountCreator") public class BidderAccountCreatorBean implements BidderAccountCreator {
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Marks POJO stateful
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Building business logic with session beans
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@Resource(name="jdbc/ActionBazaarDS") private DataSource dataSource; private LoginInfo loginInfo; private BiographicalInfo biographicalInfo; private BillingInfo billingInfo; private Connection connection; public BidderAccountCreatorBean () {} @PostConstruct Receives PostConstruct callback @PostActivate Receives PostActivate public void openConnection() { callback try { connection = dataSource.getConnection(); } catch (SQLException sqle) { sqle.printStackTrace(); } }
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Contains stateful instance variables
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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(); } }
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@Remove public void cancelAccountCreation() { loginInfo = null; biographicalInfo = null; billingInfo = null; } @Remove
Designates remove methods
Stateful session beans
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(); }
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.
NOTE
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!
Building business logic with session beans
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.
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