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To guarantee Quality of Service for the end user, applications need to be tested. Since AOP allows code instrumentation for controlling and logging an application s execution, AOP is a useful tool for implementing tests in a simple way. Two main categories of tests exist: Structural Functional A structural test, or white-box test, verifies the application by checking its static structure (its code or any equivalent representation). Such a test aims to identify static problems such as bad programming practice, unused variables, and unused methods in the implementation of the application. A typical structural test is coverage analysis, which consists of executing the application in order to detect unused parts. Note that the Java compiler already implements some of these verifications locally, within method bodies. A functional test, or black-box test, verifies that the behavior of the application is consistent with its specification. Functional tests are widely used in the development process. In particular, these tests can be automatically generated from scenarios, which are identified during the analysis and design stages. Among the functional tests, the nonregression tests consist of executing two different versions of the application with the same scenarios. The purpose of such tests is to detect potential differences in the behavior of the different versions. The following sections show how AOP can be used to implement some of these tests.

You can set the header element to true if the return value is returned as a part of the message header. As with the @WebParam annotation, you have to use the partName argument to customize the name of value returned from an operation.

Listing 1.5 contains the XML descriptor for the servlet. Notice that it creates the two parameters used by the servlet to build the initial context environment needed to find the remote EJBs.

15.3.6 Using @OneWay and @HandlerChain The web services metadata annotation specification defines two more annotations: @OneWay and @HandlerChain. We ll briefly introduce them, and we encourage you to explore them if you think you need to. The @OneWay annotation is used with a web service operation that does not have a corresponding output (return value). It can be used on a method as follows:

@WebMethod @OneWay public void pingServer() { }

Coverage analysis can be implemented at several granularity levels. With most of the AOP technologies, the granularity is limited to the accessing of fields and the invocation of methods and constructors. This type of coverage analysis is called function coverage analysis. A coverage-analysis tool is composed of two elements: the recorder and the comparator. The recorder is in charge of executing the application and recording all the invoked methods and accessed attributes. The comparator compares the record with the program s structure to detect unused fields or methods. We now present an example that implements only the recorder, which is the part that specifically uses AOP. The recorder generates a comma-separated value (CSV) file so that the file will be readable using standard tools such as Microsoft Excel. The following columns are defined: The type of call or access The name of the class that the called or accessed element belongs to The name of the element The type (for fields) or the return type (for methods) The parameter types (for methods and constructors) The declared exceptions (for methods and constructors) The JBoss AOP interceptor is defined in Listing 9-11. Listing 9-11. A Simple Code-Coverage Analyzer Implemented with AOP 001 002 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017 018 019 020 021 package aop.tests.cover; import import import import import import import import import import import import import import import java.io.FileNotFoundException; java.io.FileOutputStream; java.io.PrintWriter; java.lang.reflect.Constructor; java.lang.reflect.Field; java.lang.reflect.Method; org.jboss.aop.ConstructorInvocation; org.jboss.aop.FieldInvocation; org.jboss.aop.Interceptor; org.jboss.aop.Invocation; org.jboss.aop.InvocationResponse; org.jboss.aop.InvocationType; org.jboss.aop.MethodInvocation; org.jboss.util.xml.XmlLoadable; org.w3c.dom.Element;

In this case, pingServer doesn t return anything and @OneWay optimizes the message to reflect this. The @HandlerChain annotation is used to define a set of handlers that are invoked in response to a SOAP message. Logically, handlers are similar to EJB interceptors that were discussed earlier in part 2 of this book. Handlers are defined in an XML file. It probably makes sense to align interceptor annotations and web services handlers in a future release of Java EE, and use the interceptor programming model for JAX-WS handlers. Also, it s worth mentioning that in an EJB web service, both EJB 3 interceptors and message handlers will fit the bill.

<servlet> <servlet-name>login-servlet</servlet-name> <servlet-class>LoginServlet</servlet-class> <init-param> <param-name>url</param-name> <param-value>http://localhost:7001</param-value> </init-param> <init-param> <param-name>factory_class</param-name> <param-value>weblogic.jndi.WLInitialContextFactory</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>login-servlet</servlet-name> <url-pattern>/login-servlet</url-pattern> </servlet-mapping>

If you are using both JAX-WS handlers and interceptors in the same web service, invoking InvocationContext.getContextData() in the interceptor or WebServiceContext.getMessageContext()in the JAX-WS handler will return the same Map instance.