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This section presents a simple example of an aspect-oriented application with AspectJ. This example introduces the syntax for writing aspects, pointcuts, and advice code. The example is an order-management application that manages client orders. The application implements a trace aspect, which traces the execution of the application and determines which methods are called and the order that they are called in.

As with all other types of EJBs, security and transaction control is implemented in the usual way. In some cases, transactions and security do have special considerations that you must take into account when dealing with message-driven beans. For example, you need a good way to prevent unwanted clients from sending messages to your message-driven EJBs and triggering business logic, and you also need to know how to handle rollbacks in the onMessage() method. In addition, you should keep in mind that message-driven beans are stateless, and you should therefore not attempt to keep any state information stored at a class level inbetween onMessage() invocations. The MessageDriveBean interface must be implemented in order to provide the bean with the appropriate bean methods, such as ejbRemove() and ejbCreate(). The Context object set in the bean is an instance of the MessageDrivenContext, which provides many of the methods found in the session and entity bean context classes. However, due to the nature of the message-driven bean, many of the

Table 5.3 Differences between lifecycle and business method interceptors. Lifecycle interceptors are created to handle EJB lifecycle callbacks. Business method interceptors are associated with business methods, and are automatically invoked when a user invokes the business method. (continued) Supported Feature Transaction and security context Lifecycle Callback Methods No security and transaction context. Transaction and security are discussed in chapter 6. Business Method Interceptor Share the same security and transaction context within which the original business method was invoked.

This is all we want to say about interceptors right now. Clearly, interceptors are an extremely important addition to EJB. It is likely that the AOP features in future releases of EJB will grow more and more robust. Interceptors certainly have the potential to evolve into a robust way of extending the EJB platform itself, with vendors offering new out-of-the-box interceptor-based services. Let s move on to the final vital EJB 3 feature we ll cover in this chapter: the timer service. Timers can be used only by stateless session beans and MDBs.

context methods will throw an exception if used. Since a message-driven bean has no real EJB client (only the container that delivers the message), the getCallerPrincipal() and isCallerInRole() methods throw a runtime exception. In addition, message-driven beans have no home interfaces (and therefore have no home objects), so getEJBHome() and getEJBLocalHome() also throw runtime exceptions if used. Finally, since no EJB clients exist for a message-driven bean, the transaction context for the start of the onMessage() method is started by the container in the case of container-managed transactions, or by the bean itself in the case of bean-managed transactions.