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static { try { new Configuration().configure().buildSessionFactory(); // SessionFactory is now in JNDI, see hibernate.cfg.xml } catch (Throwable ex) { ex.printStackTrace(System.out); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { SessionFactory sessions = null; try { Context ctx = new InitialContext(); String jndiName = "java:hibernate/HibernateFactory"; sessions = (SessionFactory)ctx.lookup(jndiName); } catch (NamingException ex) { throw new InfrastructureException(ex); } return sessions; }
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Note that we have to use the getSessionFactory() helper method now whenever we need the SessionFactory for example, in the getSession() routine. We also have to configure Hibernate to place the SessionFactory in JNDI after the call to buildSessionFactory(), as described in chapter 2, section 2.4.2, JNDI-bound SessionFactory. In the next step, we move some of the code from the servlet action into the bidForItem() method of a new CaveatEmptorFacade session bean. This change highlights a limitation of the EJB specification. In our servlet-only implementation, we were able to perform all exception and transaction handling in a servlet filter and our utility class. A servlet filter is the servlet specification s implementation of the interceptor pattern. Unbelievably, the EJB specification provides no standard way to implement interceptors for EJB method calls. Certain containers, such as JBoss and WebLogic, provide vendor-specific interception APIs, and we encourage you to use these facilities if portability isn t an immediate goal. In our case, we need to demonstrate code that will work with all vendors products, so we need to move the tedious exception and transaction handling code into the bidForItem() method. (In the next section, we ll use the EJB command pattern to pull it back out again!) The remote interface of our session fa ade is simple enough:
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public interface CaveatEmptorFacade extends javax.ejb.EJBObject { public Bid bidForItem(Long userId, Long itemId, BigDecimal bidAmount) throws RemoteException; }
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The bean implementation class is as follows:
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public class CaveatEmptorFacadeBean implements javax.ejb.SessionBean { public void setSessionContext(SessionContext sessionContext) throws EJBException, RemoteException {} public void ejbRemove() throws EJBException, RemoteException {} public void ejbActivate() throws EJBException, RemoteException {} public void ejbPassivate() throws EJBException, RemoteException {} public Bid bidForItem(Long userId, Long itemId, BigDecimal bidAmount) throws RemoteException { Bid newBid = null; try { ItemDAO itemDAO = new ItemDAO(); UserDAO userDAO = new UserDAO(); BigDecimal currentMaxAmount = itemDAO.getMaxBidAmount(itemId); BigDecimal currentMinAmount = itemDAO.getMinBidAmount(itemId); Item item = itemDAO.getItemById(itemId); User user = userDAO.getUserById(userId) newBid = item.placeBid(user, newAmount, currentMaxAmount, currentMinAmount); HibernateUtil.commitTransaction(); } finally { HibernateUtil.closeSession(); } return newBid; }
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Note that the call to HibernateUtil.commitTransaction() might not actually commit the database transaction: Hibernate transparently handles the fact that it s running in an EJB container with JTA, so the database transaction might remain in effect until the container commits it. However, a Hibernate Session flush occurs at this point. The failure of one of our business rules is indicated by throwing a BusinessException back to the client of this session bean. A failure of an infrastructure part of the application will throw an InfrastructureException; both will be wrapped in an EJBException, which in turn will be sent to the client wrapped in a RemoteException (all of this is handled by the EJB container). It will be the job of
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the action (on the web tier) to interpret these wrapped exceptions and display a meaningful message to the user. The action code therefore becomes
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public void execute() { // Get values from request try { Context ctx = new InitialContext(); String jndiName = "java:comp/ejb/CaveatEmptorFacade"; CaveatEmptorFacade ejbFacade = (CaveatEmptorFacade) ctx.lookup(jndiName); Bid newBid = ejbFacade.bidForItem(userId, itemId, bidAmount); // Place new Bid in scope for next page // Forward to success page } catch (RemoteException ex) { // Get the EJBException that contains our runtime // Infrastructure and Business exceptions. } }
We will now abandon the session fa ade pattern and use a design based on the command pattern, an approach that has proven to be flexible and, in some situations, better than a session fa ade. The EJB command pattern The EJB command pattern replaces the methods of a session fa ade such as bidForItem() in our example with command classes. We have a BidForItemCommand. The execute() method of this command is called by a stateless session bean known as the command handler. The command handler lets you take advantage of container transactions and security and implements generic exception handling (it could even provide a full interceptor framework). The command itself encapsulates a unit of application logic, input parameters, and output parameters. It s instantiated by the client action, dispatched to the command handler, executed in the context of the EJB tier, and finally returned to the client with the result of the operation. The command pattern lets you reduce code by handling some concerns generically and also by reducing the amount of noise involved in EJB development. The commands are simple POJOs and are easy to write and reuse; they may even be reused outside of the EJB container (just like the POJO domain model). The only requirement is that commands implement the following interface:
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