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his chapter illustrates a third environment for aspect-oriented programming: JBoss AOP. The syntax and concepts presented in this chapter correspond to version 1.1.1 of JBoss AOP, which is the latest version available at the time of the writing of this book. JBoss AOP, like JAC, is a framework for AOP. Aspects and advice code blocks are written in regular Java, without any new keywords. However, in JBoss AOP, pointcuts are defined in XML unlike JAC, where they are defined in Java. In addition, the weaving is dynamic and performed at run time, similar to that in JAC. JBoss AOP was designed and developed by Bill Burke. The JBoss Group in particular, Marc Fleury, the CEO contributed to the ideas that led to the implementation of JBoss AOP. JBoss AOP can be used as a stand-alone framework, or it can be included in the JBoss 4.x J2EE application server. JBoss AOP is open-source software released freely under the terms of the GNU Lesser General Public License (LGPL). While JBoss AOP is open source, this license allows for the incorporation of the software into business products. The JBoss AOP web site is http:// www.jboss.org/products/aop.

WHERE SIZE(c.items) = 5

This expression will return true when the SIZE of c.items is 5, and false otherwise. Temporal functions Most languages provide functions that retrieve the current date, time, or timestamp. JPQL offers the temporal functions shown in table 10.12. These functions translate into database-specific SQL functions, and the requested current date, time, or timestamp is retrieved from the database.

System.out.println("---------[ Remote Methods ]-------"); for(int i = 0; i < remoteMethods.length; i++) { System.out.println("\nMethod " + "Found:"+remoteMethods[i].getName()); Class[] params=remoteMethods[i].getParameterTypes(); for(int j = 0; j < params.length; j++) { System.out.println(" Param:"+params[j].getName()); } } System.out.println("-----[ Remote Methods ]--------\n\n"); } catch(Exception e) { e.printStackTrace(); } System.out.println("End of the example...\n"); }

Table 10.12 JPQL temporal functions Temporal Functions CURRENT_DATE CURRENT_TIME CURRENT_TIMESTAMP Description Returns current date Returns current time Returns current timestamp

This section presents an example of an aspect-oriented application with JBoss AOP. This example introduces the syntax for writing aspects, pointcuts, and advice code. We will reuse the order-management application that was presented in 3. The application manages client orders. We will implement the same trace aspect that was programmed in 3, but with JBoss AOP. This aspect traces the execution of the application and determines the called methods and the order that they are called in.

Note that because JPQL time values are retrieved from the database, they may vary slightly from the time retrieved from your JVM, if they aren t both running on the same server. This is only an issue if you have a time-sensitive application. You can resolve this issue by running a time service on all servers that are part of your environment. Next we ll look at the SELECT clause of JPQL.

The EJBMetaData class is intended to be used by tool developers. For example, an integrated development environment (IDE) application or deployer tool can use the metadata from an EJB for a richer user experience for the EJB application developer . However, using the EJBMetaData class, you can expose your EJB instances to the reflection API. This allows you to use reflection with EJBs for the same advantages and decoupling as you would for normal applications.

In the examples in this chapter, we won t explore the solutions beyond what is necessary for discussing the EJB 3 component types but will leave some of it for you as a brainteaser. If you want to, you can peek at the entire solution by downloading the zip containing code examples file from www.manning.com/panda. In fact, we highly recommend that you follow

the tutorial on the site to set up your development environment using the code. That way, you can follow along with us and even tinker with the code on your own including running it inside a container.

Java applets can be useful front ends to an EJB application. Unlike servlets, JSPs, or standalone Java applications, applets can easily contact a single remote host (the one that delivered it to the user). To contact an EJB from an applet, you need to package some special classes for it to function correctly. In addition, you must consider the special security restrictions imposed on an applet.

The first aspect written with JBoss AOP monitors each ordered item by displaying a message before and after the addItem method as defined in the Order class. This aspect is defined by two files: jboss-aop.xml and TraceInterceptor.java. The former is an XML file that defines a pointcut; the latter is a Java file that defines the advice code associated with this pointcut. JBoss AOP uses the term interceptor instead of advice code; however, there are no differences between the two. Both define code that will be run before and after the joinpoints included in the pointcut.

EJB 3 is a fundamental paradigm shift from previous versions. A number of innovations, some familiar and some unfamiliar, make this paradigm shift possible. A good place to start this chapter is with an exploration of three of the most important innovations.