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Building business logic with session beans
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container activates the bean instance again when the client needs it; this process is called activation. The @PrePassivate and @PostActivate annotations apply to the passivation and activation lifecycle events.
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You can define a lifecycle callback method either in the bean class or in a separate interceptor class.
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Table 3.1 lists the lifecycle callback method annotations, where they are applied, and what the callback methods are typically used for. In sections 3.2.4 and 3.3.4, you ll learn how to define lifecycle callback methods in the bean class for stateless and stateful beans. We ll defer our discussion of lifecycle callback methods in the interceptor classes to chapter 5.
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Table 3.1 Lifecycle callbacks are created to handle lifecycle events for an EJB. You can create these callback methods either in the bean class or in an external interceptor class. Callback Annotation javax.annotation. PostConstruct Type of EJB Stateless, stateful, MDB Typically Used For... This annotated method is invoked after a bean instance is created and dependency injection is complete. Generally this callback is used to initialize resources (for example, opening database connections). This annotated method is invoked prior to a bean instance being destroyed. Generally this callback is used to clean up resources (for example, closing database connections). This annotated method is invoked prior to a bean instance being passivated. Generally this callback is used to clean up resources, such as database connections, TCP/IP sockets, or any resources that cannot be serialized during passivation. This annotated method is invoked after a bean instance is activated. Generally this callback is used to restore resources, such as database connections that you cleaned up in the PrePassivate method.
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Stateless, stateful, MDB
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javax.ejb.PostActivate
Stateful
Stateless session beans
At this point, let s launch our detailed exploration with the simpler stateless session bean model and save stateful session beans for later.
3.2 Stateless session beans
As noted earlier, stateless session beans model tasks don t maintain conversational state. This means that session beans model tasks can be completed in a single method call, such as placing a bid. However, this does not mean that all stateless session beans contain a single method, as is the case for the PlaceBidBean in chapter 2. In fact, real-world stateless session beans often contain several closely related business methods, like the BidManager bean we ll introduce soon. By and large, stateless session beans are the most popular kind of session beans. They are also the most performance efficient. To understand why, take a look at figure 3.3, which shows a high-level schematic of how stateless session beans are typically used by clients. As you ll learn in section 3.2.4, stateless beans are pooled. This means that for each managed bean, the container keeps a certain number of instances handy in a pool. For each client request, an instance from the pool is quickly assigned to the client. When the client request finishes, the instance is returned to the pool for reuse. This means that a small number of bean instances can service a relatively large number of clients. In this section you ll learn more about developing stateless session beans. We ll develop part of the business logic of our ActionBazaar system using a stateless session to illustrate its use. You ll learn how to use @Stateless annotations as well as various types of business interfaces and lifecycle callbacks supported with stateless session beans.
Figure 3.3 Stateless session bean instances can be pooled and may be shared between clients. When a client invokes a method in a stateless session bean, the container either creates a new instance in the bean pool for the client or assigns one from the bean pool. The instance is returned to the pool after use.
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