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Select methods are not generated into a particular interface the only result you should see is in the XML deployment descriptor. The descriptor will contain the EJB-QL and proper declarations for the method. Keep in mind that ejbSelect methods run under the transaction context of the invoker.

Keep these three levels in mind when evaluating possible options to put in your cache. Try moving items from one cache to another if possible, to determine which configuration works best for your specific application and runtime usage patterns. Transactional cache Transactional caching ensures that the object from the cache is returned when the same object is requested again. A typical example is that you run a query that returns an Item entity, and that entity will be cached in the transactional cache. When you use the EntityManager.find method to retrieve the Item again, the persistence provider will return the same Item instance from the transactional cache. The other benefit of a transactional cache is that all updates to an entity are deferred to the end of the transaction. Imagine what would happen if you did the following in the same transaction:

Item item = new Item(); item.setTitle(title); item.setInitialPrice(initialPrice); Seller seller = entityManager.find(Seller.class, sellerId); item.setSeller(seller); entityManager.persist(item); item.setInitialPrice(newInitialPrice);

Pointcuts allow programmers to define where an aspect applies. The concept of advice code defines the behavior of an aspect in other words, advice code states what an aspect is doing. The terms used for the code structure that defines the behavior of an aspect varies from advice code (AspectJ), to wrapper (JAC), to interceptor (JBoss AOP and Spring AOP). However, the idea behind these terms is the same: to define the instructions that will be executed before and after the joinpoints.

Occasionally you need to compute a value that encompasses all bean instances, such as the sum of all account balances over all Account entity beans. Since these methods are independent of any particular bean instance, they need to be defined on the home interface. As long as XDoclet is generating your home interface (see recipe 2.1), you should add any home methods to that generation. Please read recipe 2.1 before following this recipe.

If your persistence provider doesn t use a cache and doesn t defer the commit until the end of the transaction, then it probably will perform what translates to at least two SQL statements. First, it will execute a SQL INSERT to persist the Item. This will be followed by a SQL UPDATE to modify the initialPrice. Most persistence providers will make use of a cache and then execute a single INSERT that will take the new price into account. Hibernate calls this cache its first level or session cache, and TopLink calls it the UnitOfWork cache. Both of these products enable these caches by default. Check whether your persistence provider supports this type of cache. We aren t aware of any reason you d want to disable the transactional cache. Using an extended persistence context The transaction cache will demarcate a single transaction. This could be a problem if your application needs to maintain conversational state between different method calls, since it will require multiple round-trips to the database to retrieve the same entity. You can avoid this situation by using an extended persistence context. You may remember from our discussions in chapter 9 that only stateful session beans support extended persistence contexts. They allow you to keep entity

instances managed beyond single method calls and transaction boundaries. You can use extended persistence context as a cache for your stateful bean instance during the state of conversation, which can reduce the number of round-trips to your database. Additionally, all database updates resulting from persist, merge, remove, and so forth are queued until the end of the persistence context, reducing the number of database operations. Listing 13.1 shows how you can use an extended persistence context for caching entities between method calls of your application.

To add home methods to either/both of your home and local home interfaces, you simply need to add a method-level JavaDoc tag to the method in the bean source. For example, the following method from an entity bean illustrates the necessary JavaDoc:

@Stateful @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED) public class PlaceOrderBean implements PlaceOrder { @PersistenceContext(unitName = "ActionBazaar", type = PersistenceContextType.EXTENDED) EntityManager em; private private private private Bidder bidder; List<Item> items; ShippingInfo shippingInfo; BillingInfo billingInfo;