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PLINQ is a powerful data parallelism enhancement in .NET 4. Objects that implement the IParallelEnumerable<T> interface can invoke the parallel execution engine, allowing data processing distribution across multiple cores. Although performance can vary depending on environment conditions, data being processed, and so on, PLINQ is simple to use and can greatly improve query performance on object collections.

object been deprecated. We have to be cautious in using those methods and possibly avoid using any method directly from the Category class. In version 1.3 of log4j, the Category class will be removed.

The test directory is at the same level as the src directory and contains the same package structure. When you build the test classes, you will place them in the main build directory because they will not interfere with the main application there, and this makes the clean task operate on test classes too. Listing 8-1 shows the properties you will be using in this chapter. Listing 8-1. The Properties for the Test Targets # The test directory test.src=test test.build=${build}/test test.junit.reports=${test.build}/reports/junit test.junit.data=${test.build}/data/junit test.junit.style=${test.src}/style/junit httpunit.home=C:/httpunit httpunit.jar=${httpunit.home}/lib/httpunit.jar

I Tip IParallelEnumerable<T> inherits from IEnumerable<T>, meaning that PLINQ acts as a layer of additional control to typical LINQ queries.

The methods listed in Table 2-2 are level-based logging methods. Each method assigns a particular level to the message being logged. Table 2-2. Logging Methods in the Logger Class

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As you run the tests, you ll want to have fresh data and reports for analysis. However, the JUnit tasks do not keep track of the reports and data they generate, so they don t remove old data. This means if you remove or rename a test, the results of the old test will persist and appear in subsequent reports if you are not careful. One way to solve this is to remove the data and reports before each test run, as shown in Listing 8-2. Listing 8-2. Initializing the Testing Environment <!-- ################################### --> <!-- Testing targets --> <!-- ################################### --> <!-- Prepare the test directories --> <target name="test-init" description="Prepare the test directories"> <echo message="Preparing the test directories"/> <delete dir="${test.junit.reports}"/> <delete dir="${test.junit.data}"/> <mkdir dir="${test.build}"/> <mkdir dir="${test.junit.reports}"/> <mkdir dir="${test.junit.data}"/> </target> Here you remove the old reports and data so that you have a clean start to the testing process.

.AsParallel()

Before you can use the test classes to test your application, you have to compile them successfully. As you saw previously, you will keep the test source in the test directory and use the same packages as the main application. The <javac> task that compiles the test classes will have to use the extensions classes, so you build a testing classpath, as shown in Listing 8-3. Notice how you exclude the junit.jar file of the HttpUnit distribution so that Ant uses the master junit.jar file that is on its classpath. This avoids clashes in the classpath that can lead to unexpected results. Listing 8-3. The Test Classpath <!-- ################################### --> <!-- The test build classpath --> <!-- ################################### --> <path id="test.classpath"> <path refid="build.classpath"/> <fileset dir="${httpunit.home}/jars"> <include name="*.jar"/> <exclude name="junit.jar"/> </fileset> <pathelement location="${httpunit.jar}"/> <pathelement location="${test.build}"/> </path> Now that you have the classpath, you can compile the classes. In this case, the target needs the most up-to-date versions of the code to test, so you ll compile the tests only if the application compiles. Listing 8-4 shows the target. Listing 8-4. The Target to Compile the Test Classes <!-- Compile the test classes --> <target name="compile-tests" depends="package-stand-alone,deploy-copy-war,test-init" description="Compile the test classes"> <echo message="Compiling the test classes"/> <javac destdir="${test.build}" srcdir="${test.src}"> <classpath refid="test.classpath"/> </javac> </target> This is a straightforward <javac> command that takes a classpath and compiles some Java source to a specified destination directory. You create a JAR file in the dist directory because that makes it easier to distribute the test classes should you want to send them to someone else.

public void debug(Object message); public void error(Object message); public void fatal(Object message); public void info(Object message); public void warn(Object message);

PLINQ makes executing a query in parallel a very simple action through the use of the AsParallel() method. For example, consider Listing 3 7, which operates on a set of 100,000 integers; this processing is currently done sequentially. Listing 3 7. Sequential Processing of a LINQ Query using using using using System; System.Collections.Generic; System.Linq; System.Diagnostics;

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