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For example, code section A needs to access sensitive data from code section B and requests a lock so that no other code sections may modify that data while A is operating on it. Code section B needs to operate on sensitive data that code section A possesses and requests a lock on it. A s data is locked as it is waiting on a successful release by B, and B s data is locked as it is waiting on a successful release by A. This is demonstrated visually in Figure 3 1.

One of the drawbacks of the <java> task is that you have to send a set number of arguments to the java command. This is fine if you have a constant number of values you want to use, but it is not so good if you have variable numbers of arguments to pass. For example, if you always run the target Java class with the same arguments, you do not have a problem. However, say you want to run it with two arguments sometimes and three arguments at other times. In this case, you could use two targets, one for the two-argument run and one for the three-argument run. Another option is to use properties to vary the arguments sent to the application. Properties, however, make the situation more complicated, because if a property is not set, Ant will write the string you used to include the property. Usage checks will always fail in this case because they will read the argument as ${propertyName} instead of being empty, as would be the case if you ran the application at the command line. One way around this is to set defaults for every property you want to use as a command-line argument, as shown in Listing 7-3. Listing 7-3. Setting Defaults for Command-Line Arguments <!-- Set the argument defaults --> <!-- The Java execution and the script use them --> <target name="set-argument-defaults" depends="stand-alone" description="Set the defaults for the command-line arguments"> <echo message="Setting the defaults for the command-line arguments"/> <!-- Set a default for the first argument --> <condition property="arg0" value=""> <not> <isset property="${arg0}"/> </not> </condition> <!-- Set a default for the second argument --> <condition property="arg1" value=""> <not> <isset property="${arg1}"/> </not> </condition> </target>

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Figure 3 1. A deadlock occurs when A and B want mutually exclusive data. By their very nature, deadlocks can be a bit tricky to cause outright. However, by using an unsafe method of locking resources coupled with a high number of iterations, we can cause the issue to happen more frequently. Listing 3 1 iterates 100,000 times, creating instances of a class that locks resources poorly. The LockFoo() and LockBar() classes both acquire locks to shared objects in a different order. This implementation makes it impossible to guarantee that one lock will be released in time for another to be acquired. It s also impossible to guarantee that a deadlock will occur; however, it is fairly likely. Listing 3 1. Poor Lock Utilization Can Set Up Code to Be Deadlocked using System; using System.Threading; namespace 3 { class Program { static void Main(string[] args) { for (int i = 0; i < 100000; i++) { Deadlock d = new Deadlock(); d.Begin(); } } } class Deadlock {

Note From this point on, we will be using the log4j.properties configuration file listed in Listing 2-3

Here you set the value of arg0 and arg1 to an empty string if they are not already set. Ant will send these values to the Java application, which can handle them if necessary. Listing 7-4 shows this in action. In this case, you are assuming the user has the latest binaries and so doesn t need to compile them. Adding the package-stand-alone target to the depends attribute would ensure the latest source is compiled before the user runs the code. Listing 7-4. Running the Client <!-- This first target is a Java invocation --> <target name="run-stand-alone-java" depends="set-argument-defaults" description="Run the stand-alone application"> <echo message="Running the stand-alone application"/> <java classname="org.mwrm.client.Client"> <arg value="${arg0}"/> <arg value="${arg1}"/> <classpath refid="build.classpath"/> </java> </target>

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