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The same result can be obtained with AspectJ. We start by defining an abstract aspect independent of the pointcut that determines the classes to be transformed into singletons (see Listing 8-6). Listing 8-6. Implementation of the Singleton Design Pattern Using AspectJ package aop.patterns.singleton; public abstract aspect AbstractSingletonAspect { private Object singleton = null; abstract pointcut singletonPointcut(); Object around(): singletonPointcut() { if (singleton == null) { singleton = proceed(); } return singleton; } } The abstract aspect defines two elements: an abstract pointcut, which must be defined by the concrete aspects and with subclass AbstractSingletonAspect; and an around advice, which is similar to the invoke method in the JBoss AOP interceptor. This implementation presents a flow. In AspectJ, an aspect is a singleton by default, which means that one instance of the aspect is shared by all the classes designated by the

Table 14.1 EJB 2 required many interfaces that needed to extend EJB-specific interfaces. EJB 3 makes the home interface optional. Components of a Session Bean Remote or local component interface Home interface EJB 2 Extends either EJBObject or EJBLocalObject Extends EJBHome or EJBLocalHome EJB 3 Business interface (POJI).

Given that the home interface is optional, you can consider it deprecated. We recommend you begin the process of making the shift away from the home interface in both your thinking as well as your code. More on removing the home interface in the sections ahead... Interfaces If you need to migrate your component interfaces, we ve got just the recipe; you ll have to make the following changes:

JNDI value referenced in the deployment descriptor of your bean. Notice that the JNDI name is always relative to the standard JNDI context name, java:comp/env.

Your component interface (remote or local) becomes a regular business interface. In other words, it does not extend one of the EJB interfaces. Your business methods don t have to throw unnecessary exceptions such as RemoteException.

singletonPointcut pointcut. Therefore, the aspect contains a reference to one unique instance of the singleton class. Each time the advice is executed, the existing singleton is obliterated by one of the newly created classes. The AspectJ keywords perthis and pertarget cannot be used here since they would generate one instance of the aspect for every instance of the class, which is the opposite of the desired effect. This problem can be solved in the following way: Define an abstract aspect as a superaspect for several concrete aspects: one for each class to be turned into a singleton. This way, the individual classes will not interfere with the other singletons. This is the solution we have chosen to implement in the preceding example. Use a hash table (java.util.Hashtable) to store the singleton for each of the transformed classes. We give an example of this solution in the next section. We can now define a concrete aspect for each of the classes to be made into a singleton. If we want to transform the Stats class into a singleton, as we did previously with JBoss AOP, we must program the aspect shown in Listing 8-7. Listing 8-7. Concrete AspectJ Aspect to Bind the Singleton Design Pattern to the Stats Class package aop.patterns.singleton; public aspect SingletonAspect extends AbstractSingletonAspect { pointcut singletonPointcut() : call(Stats.new(..)); } Once the application is compiled, we execute the test class shown previously, obtaining the following result:

Figure 14.2 The changes necessary to migrate EJB 2 business interfaces to EJB 3. You do not have to extend EJB-specific interfaces or throw RMI or EJB exceptions in the methods.

It is generally accepted as best practice to open a connection from a DataSource object retrieved from the application server. This allows your EJB to have the maximum portability when it comes to JDBC connections. However, if you have strong motivation for not wanting to use a DataSource, you can load a JDBC driver and open the connection manually. You will most likely need values for a database URL, username, and password all of which can be hardcoded or also looked up through JNDI.

Let s walk through this modification with an example. Consider the following remote interface of the PlaceBid EJB using EJB 2:

public interface PlaceBid extends EJBObject { public Long addBid(String userId, Long itemId, Double bidPrice) throws RemoteException, CreateException, FinderException,

These instances are the same!

You want to set up your EJBs to use container-managed persistence (CMP).

NamingException; }