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The org.apache.log4j.LogManager class manages the creation and storage of each named logger created from within an application. Internally it uses another helper class, org.apache.log4j. Hierarchy, to store the reference of each Logger object created. The hierarchy is such that every child logger created will have a pointer to its parent logger, but a parent logger will not have any reference to its child logger. Also, log4j does not restrict application developers from instantiating a child logger before its parent. In such scenarios, the child logger instance is created, and in the Hierarchy class it is stored with an empty node for the future assignment of a parent logger whenever it is created. Application developers normally do not have to use the Hierarchy class. Instead, they use the convenience methods that the LogManager and Logger classes provide to create and obtain any named logger. Note that when we change the property of any existing named logger, a new instance is never created. The existing reference is obtained from the Hierarchy class, and the properties are changed to that reference. This is the reason why methods in the Logger class such as public void addAppender(Appender appender) are synchronized to make sure that two threads do not operate on the same instance of a named logger at the same time. The LogManager class provides the useful methods described in Table 2-3.

Listing 3 15. T-SQL Code to Define the Tag Entries for a Particular Piece of Content SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[ContentTags]( [contentID] [int] NOT NULL, [tagID] [int] NOT NULL, [userID] [int] NOT NULL ) ON [PRIMARY]

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The <junit> task allows you to run a batch of tests at once and uses a file set to group these tests together. This means you must have a strong naming convention for your test cases. The naming convention should allow you to include all test cases easily while ignoring abstract and helper classes. The usual method is to end the name of test cases with Test. Thus, you have WebTest or ClientTest, not TestWeb. With this in mind, let s use the <batchtest> element to include all the test cases. Listing 8-10 shows you how. Listing 8-10. Running All the Tests in a Batch <target name="test" depends="compile-tests" description="Test the application"> <echo message="Testing the application"/> <junit haltonfailure="true" printsummary="false"> <classpath refid="test.classpath"/> <formatter type="brief" usefile="false"/> <formatter type="xml"/> <batchtest todir="${test.junit.data}"> <fileset dir="${test.build}" includes="**/*Test.class"/> </batchtest> </junit> </target> The todir attribute here replicates the todir attribute of the <test> element from before, while the file set simply includes all the test classes.

public static Enumeration getCurrentLoggers(); public static Logger exists(String name); public static Logger getLogger(String name);

Although this structure is fairly simple, it does open up a wide variety of uses. For example, when working with tags, it s useful to provide a list of currently applied tags for a piece of content when a user is looking to label that content; it s more convenient for a user to just click a list of tags to add or remove the tag from a list. A good example of this is the popular website Delicious, which allows users to create public bookmark lists and tag them for easy access (see Figure 3 17).

The entire testing process is now automated, but you can still make more improvements. For example, you have lots of XML data to work with, which means you have to write parsing code to extract the data should you want to get any meaning from it. Luckily, the <junitreport> optional task is a built-in report generator that may well provide what you need. This report generator takes the results of all the tests, aggregates them into a master XML results file, and transforms them into an HTML report. Listing 8-11 shows how to use the <junitreport> element to create such a report. Listing 8-11. Creating an HTML Report <target name="test" depends="compile-tests" description="Test the application"> <echo message="Testing the application"/> <junit haltonfailure="true" printsummary="false"> <classpath refid="test.classpath"/> <formatter type="brief" usefile="false"/> <formatter type="xml"/> <batchtest todir="${test.junit.data}"> <fileset dir="${test.build}" includes="**/*Test.class"/> </batchtest> </junit>

This method returns an enumeration of the existing named loggers. This method checks for the existence of a particular named logger. This method obtains an existing named logger.

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