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<target name="prepare"> <path id="classpath"> <pathelement path="." /> <fileset dir="${jboss-aop.root}/lib"> <include name="*.jar" /> </fileset> </path> <taskdef name="aopc" classname="org.jboss.aop.ant.AopC" classpathref="classpath"/> </target> <target name="compile" depends="prepare"> <javac srcdir="src" destdir="." debug="on" deprecation="on" optimize="off" includes="**"> <classpath refid="classpath"/> </javac> <aopc compilerclasspathref="classpath" classpathref="classpath" verbose="true"> <classpath path="."/> <src path="."/> <aoppath path="jboss-aop.xml"/> </aopc> </target> <target name="run" depends="compile"> <java fork="yes" failOnError="true" className="aop.jboss.Customer"> <sysproperty key="jboss.aop.path" value="jboss-aop.xml"/> <classpath refid="classpath"/> </java> </target> </project> The build.xml file defines three tasks: compile, run, and prepare. Each task is also called a target and is defined by a <target> tag. The first target compiles the application by compiling the .java files with the regular Java compiler (see the <javac> tag), and then it prepares the compiled classes for weaving with the JBoss AOP compiler (see the <aopc> tag). Note that <aopc> is a custom Ant task that is defined in the prepare target (see the <taskdef> tag). The run target launches the application by running the Java virtual machine (see the <java> tag). Finally, prepare is a utility target, which is run before compile to set the Java class path and to declare the custom aopc Ant task. To compile the order-management application, call Ant from the operating-system command shell with the following command: ant compile

The query will retrieve all instances of Seller, Bidder, Admin, and so forth that match this query condition. How do you handle a polymorphic query in your client code Consider the following:

query = em.createNamedQuery("findUserByName"); query.setParameter("firstName", firstName); List<User> users = query.getResultList(); Iterator i = users.iterator(); while (i.hasNext()) { User user = (User) i.next(); System.out.print("User:"+emp.getUserId()); if (user instanceof Seller) { Seller seller = (Seller) user; System.out.println("Seller:" + seller.getCommissionRate()); } else if (user instanceof Bidder) { Bidder bidder = (Bidder) bidder; System.out.println("Bidder:" + bidder.getDiscountRate()); } }

Notice that the applet code used to look up the EJB is very similar to what you find in other remote clients. However, remember that applets can contact only a single remote host the host that contains the applet class files. For this example, we assume the EJB container also resides on this host and that the applet can therefore contact it. If the applet was a signed applet, it could contact other hosts. To ensure that this applet creates the correct JNDI environment for the InitialContext instance, we use the getCodeBase() method to retrieve the correct URL information. The second important item for this example is contained in the HTML used to launch the applet. An applet that launches an EJB is going to need the EJB classes (stubs and interfaces), as well as vendor-specific classes used to create the JNDI environment. For instance, our applet uses Weblogic classes. All the necessary classes should be packaged into a JAR file or files and listed in the ARCHIVE attribute of the applet HTML. We created our HTML file by running a simple HTML file through the Java plug-in HTML converter utility. Doing this generated the necessary browser tags that force a client download of the Java plug-in (which the applet requires). When you are developing applets that must contact EJBs, consider developing a servlet for the applet. When the applet needs information contained or created by an EJB, it can contact the servlet, which will handle the actual EJB work. Using a servlet decouples your applet from the EJB container, building in more flexibility for your applet. In addition, browsers will have to download less code (your code and third-party JARs) when the applet contacts a servlet rather than an EJB container.

This code snippet uses the instanceof keyword to test user. Some Java gurus recommend you avoid using instanceof, but we use it here as a last resort. You have to ensure that your operations are just as polymorphic as your queries! In our example, you can easily convert the operations to be polymorphic by adding a getRate method in all entities. The getRate method will return the commissionRate for the Seller entity, whereas it will return the discountRate for the Bidder entity. The resulting code should look like this:

To run the order-management application, call Ant from the operating-system command shell with the following command: ant run The output of this command is shown in Listing 5-4. Listing 5-4. The Output of the Order-Management Application with a JBoss AOP Trace Aspect Buildfile: build.xml prepare: compile: run: [java] -> Before addItem [java] 2 item(s) CD added to the order [java] -> After addItem [java] -> Before addItem [java] 1 item(s) DVD added to the order [java] -> After addItem [java] Order amount: US$50.0 BUILD SUCCESSFUL Total time: 1 second The two executions of the addItem method have been trapped, and the messages of the TraceInterceptor interceptor are displayed before and after these joinpoints.

Iterator i = users.iterator(); while (i.hasNext()) { User user = (User)i.next(); System.out.print("User:" + emp.getUserId()); System.out.println(user.getRate()); }