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In the filter object design pattern, we can identify a typical structure of AOP: the around advice code. To get the same effect, we could replace the MembershipFilter class with an aspect, and the filter method doFilter (line 20) with around advice code. Indeed, the invocation of the doFilter method on the chain (line 26) has a similar effect as proceed within around advice code. The use of AOP does not greatly improve the code modularity, because the resulting implementation is very similar to that of the filter object pattern. However, it can improve performance in an outstanding way since the web container handles the interception chain in a transparent and noncontrollable manner. The mechanism is dynamic and may induce overhead. Due to compile-time weaving such as in AspectJ, the interception code can be inserted directly within the target class code, thus removing the implementation of the chain initialization and iteration mechanism. Listing 12-23 shows an aspect-oriented implementation of a filter. Listing 12-23. An Implementation of the Authorization Filter Using AOP 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 package aop.j2ee.client.web.aspect; import java.io.IOException; import javax.servlet.*; import javax.servlet.http.*; import aop.j2ee.presentation.bean.SubscriberBean; public class SilverMembershipFilterAspect { declare precedence: GoldMembershipFilterAspect, SilverMembershipFilterAspect, *; private String FrontController.subscriptionType="silver"; private String FrontController.denyPage="/secure/denied.jsp; pointcut filter(ServletRequest request,ServletResponse response): execution(protected void process(HttpServletRequest, HttpServletResponse)) && args(request,response); around(ServletRequest request, ServletResponse response): filter(request,response) { throws IOException, ServletException { [...] // applies a treatment to the request // continues the filters application proceed(request,response); [...] // applies a treatment to the response } }

Spring s JmsTemplate greatly simplifies common JMS tasks like sending messages by automating generic code. Using JmsTemplate, our entire message producer code could be reduced to a few lines. This is a great way to take care of tasks, as long as you aren t doing anything too complicated such as using temporary queues, JMS headers, and properties. At the time of this writing, Spring doesn t have very robust asynchronous messageprocessing capabilities when compared to MDB. Any future MDB-like features in Spring are likely to utilize the relatively arcane JCA container, which leaves room for a great Spring/EJB 3 integration case.

We just finished reviewing most of the major parts of JMS that you need to send and use with MDB. While full coverage of JMS is beyond the scope of this chapter, we encourage you to fully explore the fascinating JMS API by visiting http:// java.sun.com/products/jms/docs.html. In particular, you should explore how JMS message consumers work. Having taken a closer look at JMS messages, the time is right to look at the Turtle server message consumer, which we ll build using an MDB.

public class SampleBean implements SessionBean, SessionSynchronization { private Object stateVariable; public void afterBegin() throws RemoteException { //Transaction has started stateVariable = initializeState(); } public void beforeCompletion() throws RemoteException { //Transaction is about to complete

We ll now build on our brief coverage of MDBs in chapters 1 and 2 and explore MDBs in detail, why you should consider using them, and how to develop them. We ll also discuss some best practices as well as pitfalls to avoid when developing MDBs. Message-driven beans are EJB components designed to consume the asynchronous messages we ve been discussing. Although MDBs are intended to handle

In the aspect-oriented solution, proceed implements the call to the next filter (line 25). The order in which the filters are applied is defined by the precedence declaration (line 9). Here, we apply the filter with the pointcut that corresponds to the execution of the request processing of

many different kinds of messages (see the sidebar JCA Connectors and Messaging ), we ll primarily focus on MDBs that process JMS messages because most enterprise applications use JMS. From this perspective, you might ask why we d need to employ EJBs to handle the task of consuming messages at all when we could use the code we just developed for the JMS message consumer. We ll address this question next. We ll develop a simple message consumer application using MDBs and show you how to use the @MessageDriven annotation. You ll also learn more about the MessageListener interface, activation configuration properties, and the MDB lifecycle.