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Let s start by modifying the Ant build script created in 3 to use the AspectJ ajc compiler rather than javac. First we ll add the JAR files contained in the AspectJ lib directory under the directory lib/aspectj of the TechConf application. The required JARs are aspectjlib.jar aspectjrt.jar aspectjtools.jar aspectjweaver.jar
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CHAPTER 10 ADDITIONAL TOPICS
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To add the JARs to the classpath we can create a path element and add it to the project s classpath as shown next: <path id="aspectj.class.path"> <fileset dir="${aspectj-lib}"> <include name="*.jar"/> </fileset> </path> <path id="class.path"> ... <path refid="aspectj.class.path"/> </path> We will keep all AspectJ aspect code (.aj) in its own source directory named aspects under the src directory and add it to the global path of code to be compiled as shown next: ... <property name="src-aspects" location="${src}/aspects" /> <path id="all.source.path"> ... <pathelement path="${src-aspects}"/> </path> To use the AspectJ ajc compiler, we use a taskdef element to import the tasks as shown next: <!-- AspectJ - eclipse.org --> <taskdef resource="org/aspectj/tools/ant/taskdefs/aspectjTaskdefs.properties" classpathref="aspectj.class.path" /> Finally we can modify the compile target to use the iajc task as shown: <!-- =================================================================== <!-- Target: compile <!-- Compiles all classes <!-- =================================================================== <target name="compile" depends="compile-init" description="Compiles all classes (JDK1.5)"> <iajc source="1.5" destdir="${classes}" classpathref="class.path" debug="on" showWeaveInfo="${aspectj.showWeaveInfo}"> --> --> --> -->
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CHAPTER 10 ADDITIONAL TOPICS
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<sourceroots> <path refid="all.source.path" /> </sourceroots> </iajc> </target> The only new property used in this target is the aspectj.showWeaveInfo which you can define in the build.properties file with an initial value of false . Now that the buildfile has been modified to use AspectJ we can move to create our first AspectJ aspect. At this point the build should work in exactly the same way it did previously. Since there are no aspects defined, the compiled bytecode will be equivalent to that produced with the javac compiler. In order to run the AspectJ-enhanced code you ll also need to include the aspectjrt.jar file in your deployable archive on JBoss or Tomcat. In the next section we will learn how to use AspectJ to fulfill several cross-cutting concerns in the TechConf Web application. This section is by no means an exhaustive coverage of AOP or AspectJ but a pragmatic introduction in the context of a real application.
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Logging and Tracing with AspectJ
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The logging and tracing aspect will allow us to trap method calls from specific packages and cause log statements to be issued without polluting the application code with logging statements. For the actual logging we will use the Jakarta Commons Logging package (http:// jakarta.apache.org/commons/logging/), which provides a useful abstraction over the most common logging packages including Log4J and the JSE Logging. In AspectJ an aspect is defined using syntax that is an extension of the Java language. Beside the special constructs provided by AspectJ, any other valid Java code is by definition valid code in an AspectJ file. The simplest, empty aspect we can create in AspectJ is public aspect LoggingAndTracingAspect {} As you can see, the keyword aspect is an extension to the Java language. Of course, the aspect previously defined doesn t do anything at all. First, let us add code to determine where our aspect will be applied. In AOP lingo, we are going to define pointcuts that will be used by the AspectJ compiler to decide at which join points the aspect will be applied. Join points are points in the dynamic call graph. In AspectJ there are several kinds of join points: Method and constructor call Method and constructor execution Field get and set Exception handler execution Static and dynamic initialization Advice execution The definition of the aspect s pointcuts is the criteria for when to use the aspect and it is provided via a rich pointcut expression language (as well as Java 1.5 annotations and XML-based syntax). Let s start with defining a pointcut called traceMethods that
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