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CHAPTER 9 QUALITY OF SERVICE AND AOP
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out.print("Method call,"); recordMethodCall(className,methodName,returnType, parameters, exceptions); } else if (invocationType==InvocationType.CONSTRUCTOR) { ConstructorInvocation constructorInvocation = (ConstructorInvocation)invocation; Constructor constructor = constructorInvocation.constructor; String className = constructor.getDeclaringClass().getName(); String methodName = "N/A"; Class returnType = null; Class[] parameters = constructor.getParameterTypes(); Class[] exceptions = constructor.getExceptionTypes(); out.print("Constructor call,"); recordMethodCall(className,methodName,returnType, parameters, exceptions); } else if (invocationType == InvocationType.FIELD_WRITE || invocationType == InvocationType.FIELD_READ) { if (invocationType == InvocationType.FIELD_READ) { out.print("Field read access,"); } else { out.print("Field write access,"); } FieldInvocation fieldInvocation = (FieldInvocation)invocation; Field field = fieldInvocation.field; out.print(field.getDeclaringClass().getName()); out.print(','); out.print(field.getName()); out.print(','); out.print(field.getType()); } out.println(); out.flush(); return rsp; } ...
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The importXml method (see line 27) initializes the interceptor from the information contained in the jboss-aop.xml file in particular, from the value parameter of the record-file tag, which defines the output file name. The recordMethodCall method (see line 50) uses the out attribute to write the passed parameters in a readable way. This method is used to record method and constructor calls. The invoke method is the heart of the recorder. It verifies that the invoked element needs to be recorded (see line 55), performs an introspection on the invocation, and writes the expected data to the file (which is accessible through the out field). The recorder will be tested on the program that is shown in Listing 9-12.
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Listing 9-12. A Simple Example to be Recorded package aop.tests.cover; public class CoverExample { private static int myField = 0; public int increment(int value) { return ++value; } public int decrement(int value) { return --value; } public static int[] test(Object[] t,Object j) throws Exception,ArrayIndexOutOfBoundsException { System.out.println("Reading myField : "+myField); return null; } public static void main(String[] args) { CoverExample t = new CoverExample(); System.out.println("Increment 1 : "+t.increment(1)); System.out.println("Decrement 1 : "+t.decrement(1)); try { test(null,null); } catch (Exception e) {} } } The running of the recorder on the program in Listing 9-12 is parameterized by the jboss-aop.xml file that is shown in Listing 9-13. Listing 9-13. The Deployment of the Recorder Interceptor <interceptor-pointcut methodFilter="ALL" constructorFilter="ALL" fieldFilter="ALL" group="cover"> <interceptors> <interceptor class="aop.tests.cover.CoverRecorderInterceptor" singleton="true"> <record-file value="d:\\temp\\recordcover.csv" /> </interceptor> </interceptors> </interceptor-pointcut> <class-metadata group="cover" class="aop.tests.cover.CoverExample">
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<default> <filter>false</filter> </default> <method name="main"> <filter>true</filter> </method> </class-metadata> The pointcut is defined for all the potentially recorded elements (constructors, methods, and fields) in the cover group, which is defined through the class-metadata tag. (Here, only one tag is used for the sole class of the program.) When associating the interceptor with the pointcut, a recorder-specific tag (record-file) is added. This tag defines the output file name and is handled by the importXml method. Metadata is then associated with the CoverExample class, which is defined as part of the cover group. The filter variable, which is used by the interceptor to determine whether a method should be analyzed, is initialized. Running CoverExample produces the trace file that is shown in Listing 9-14. Listing 9-14. The Recording Output File Call type,Class,Name,Return / Type,parameters,exceptions Field write access,aop.tests.cover.CoverExample,myField,int Constructor call,aop.tests.cover.CoverExample,N/A,N/A,, Method call,aop.tests.cover.CoverExample,increment,int,int, Method call,aop.tests.cover.CoverExample,decrement,int,int, Field read access,aop.tests.cover.CoverExample,myField,int Method call,aop.tests.cover.CoverExample,test,int[],\ java.lang.Object[];java.lang.Object,\ java.lang.Exception;java.lang.ArrayIndexOutOfBoundsException Figure 9-1 shows what the trace file looks like when it is opened with Microsoft Excel.
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Call Type Field write access Constructor call Method cal l M e t h o d c a ll Field read access M e t h o d c a ll Class aop.tests.cover.CoverExample aop.tests.cover.CoverExample aop.tests.cover.CoverExample aop.tests.cover.CoverExample aop.tests.cover.CoverExample aop.tests.cover.CoverExample Name myField N/A increment decrement myField test Return/Type int N/ A in t int int int[] Par ameter s Exceptions
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int int java.lang.Object[];java.lang.Object java.lang.Exception;java.
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Figure 9-1. A coverage-analysis trace file in Microsoft Excel
Nonregression Tests
Detecting regressions consists of recording a reference behavior in one version of an application and, then, while a newer version of the application is running, comparing the obtained record to the newer version (the version to be tested). If a difference is detected, that difference must be analyzed to determine whether it is a regression.
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