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Although we briefly touched on session beans in the previous chapter, we didn t go into great detail about developing them. Before we dive in, let s revisit the code in chapter 2 to closely examine some basic traits shared by all session beans.

The anatomy of a session bean Each session bean implementation has two distinct parts one or more bean interfaces and a bean implementation class. In the PlaceBid bean example from chapter 2, the bean implementation consisted of the PlaceBid interface and the PlaceBidBean class, as shown in figure 3.1. All session beans must be divided into these two parts. This is because clients cannot have access to the bean implementation class directly. Instead, they must use session beans through a business interface. Nonetheless, interface-based programming is a sound idea anyway, especially when using dependency injection. Figure 3.1 Parts of the Interface-based programming is the practice of PlaceBid session bean. Each not using implementation classes directly whenever session bean has one or more interfaces and one possible. This approach promotes loose coupling implementation class. since implementation classes can easily be swapped out without a lot of code changes. EJB has been a major catalyst in the popularization of interface-based programming; even the earliest versions of EJB followed this paradigm, later to form the basis of DI. The session bean business interface An interface through which a client invokes the bean is called a business interface. This interface essentially defines the bean methods appropriate for access through a specific access mechanism. For example, let s revisit the PlaceBid interface in chapter 2:

@Local public interface PlaceBid { Bid addBid(Bid bid); }

Use the @ejb.value-object tag in the class-level JavaDoc for entity beans needing a value object. For example, the section of the entity bean ItemBean source shown in listing 2.8 uses this tag. The new tag is shown in bold; reference the previous recipes for information about the others. Don t worry about the tags @ejb.pkfield and @ejb.persistence for now; we cover those in the next recipe.

As previously explained, the data transfer object pattern allows for the optimization of client/ server communications. It gathers a set of elementary requests into higher-level requests, which use transfer objects to aggregate the parameters of the elementary requests. In specific cases, this design pattern greatly benefits from AOP; however, it is not recommended for modifying the business API for the purpose of optimizing the communications. Also, complicating the clients implementation for the same reasons would be an anti-pattern. With the help of AOP, we can define two aspects, one for the client and one for the server, so we can entirely free the application code from this optimization concern. First, we need to find the server utilization schemas (use cases) within the clients code that could benefit from a data transfer object optimization. If we take the code of the Simple client, we will see that the account creation is done in two consecutive remote invocations: a call to Bank.createCustomer and a call to Bank.createAccount, which take as a parameter the current created customer. This use case occurs, for instance, when registering a new customer and assigning that user a default account. This is a frequent operation that we would like to implement with only one remote call, to reduce network traffic. It can also be interesting to deal with one unique call/ transaction so that the rollback can be implemented in a more efficient way (only a local clientside cancellation is needed until we actually perform the call).

Since all EJB interfaces are POJIs, there isn t anything too remarkable in this code other than the @Local annotation specifying that it s a local interface. Recall that a business interface can be remote or even web service-accessible instead. We ll talk more about the three types of interfaces in section 3.2.3. The interesting thing to note right now is the fact that a single EJB can have multiple interfaces. In other words, EJB implementation classes can be polymorphic, meaning that different clients using different interfaces could use them in completely different ways.