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CHAPTER 10 ADDITIONAL TOPICS
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Includes the execution of any methods in any class with a name ending in DAO Includes the execution of any methods in the service package Excludes the current aspect Excludes any call to the toString, equals, and hashCode methods Using the AspectJ pointcut expression language, we can define the desired pointcut as follows: pointcut traceMethods() : execution(* com.integrallis.techconf.dao.*DAO.*(..)) || execution(* com.integrallis.techconf.service.*.*(..)) && !within(LoggingAndTracingAspect) && !cflow(execution(int *.hashCode())) && !cflow(execution(boolean *.equals(..))) && !cflow(execution(String *.toString())); Pointcuts in AspectJ are declared using the pointcut keyword. I like to think of join points as data and pointcuts as queries. As you can see, the AspectJ pointcut expression language allows you to use wildcards as shown in the first two execution elements. Notice that the wildcards can be used to indicate a method return value, package names, and formal parameters in a syntactical way. Expressions can be combined logically with and && or || and negation ! operators. Pointcuts can be named (as in the example) or they can be anonymous. By naming a pointcut, you have the ability to reuse the pointcut in several advices, while an anonymous pointcut is used inline in the advice itself. The execution operator used in the first two elements of the pointcut captures the body of a method. A similar operator, the call operator, can also be used, which captures the execution point of a method before the call to method but after its arguments are evaluated. The within operator is used here to exclude the actual aspect from being adviced. This brings to attention two important concepts in an AOP implementation: advice precedence and the application of aspects against other aspects. These concepts are out of the scope of this chapter but should be kept in mind when developing more-advanced aspects. Finally the three cflow operators are used to exclude any code in the control flow of the execution of any hashCode, equals, and toString methods. The cflow operator is a control flow based pointcut operator that is used to match join points in the execution flow or dynamic context of another join point, including the join point itself (to exclude the join point, use cflowbelow). The control flow operators are powerful since they give you the ability to follow the code as if you had control over a dynamic sequence diagram. With the pointcut defined, we can move to the implementation of the advice. AspectJ provides three kinds of advice: before advice, after advice, and around advice. The before and after advice types allow you to insert functionality before and after the execution of a join point. In the case of the LoggingAndTracing aspect advice, we ll use the before and after advices to log statements reporting the beginning and end of a method s execution. The code for the before and after advice is shown next:
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before() : traceMethods() { Signature signature = thisJoinPointStaticPart.getSignature(); traceMethodWithMessage(signature, "Entering"); } after() returning : traceMethods() { Signature signature = thisJoinPointStaticPart.getSignature(); traceMethodWithMessage(signature, "Exiting"); } Notice that the advice type is followed, after the semicolon, by the pointcut to which it applies. The before advice on traceMethods is pretty straightforward; in the body of the advice we are using the field thisJoinPointStaticPart, which gives us access to the signature of the method being advised. AspectJ provides several ways to access the context of the current advice. The signature of the method is then passed to the custom method traceMethodWithMessage alongside the message string parameter Entering . The after advice can be defined for the different outcomes of a method call. It can either apply after the successful return from the method call, after an exception, or in both cases. In our case we want the advice to apply after a successful method call as signified by the keyword returning . If we want to log methods which throw an exception, we can use an after advice as follows: after() throwing(Throwable t) : traceMethods() { Signature signature = thisJoinPointStaticPart.getSignature(); traceMethodWithMessage(signature, "Exception", t); } The traceMethodWithMessage methods make use of the Jakarta Commons Logging package to perform the actual logging as shown next: private void traceMethodWithMessage(Signature signature, String message) { traceMethodWithMessage(signature, message, null); } private void traceMethodWithMessage(Signature signature, String message, Throwable t) { Log log = LogFactory.getLog(signature.getDeclaringType()); if (log.isTraceEnabled()) { String logMessage = message + " [" + getMethodName(signature) + "]" + (t != null t : ""); log.trace(logMessage); } } private String getMethodName(Signature signature) { return signature.getDeclaringType().getName() + "." + signature.getName(); }
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