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<antcall target="generate-hashes"> <param name="file" value="${appName}-${package.docs}.zip"/> </antcall> </target> This calls the hash-generation target and adds the file property to the build for the duration of generate-hashes. The start of generate-hashes is a slight rewrite of the two <checksum> tasks from 6, to take into account the more dynamic nature of the file to hash. In this case, you are assuming the files are in the distribution directory because that s how the project works; you wouldn t be hashing anything that isn t in the distribution directory. Another reason for this assumption is that it s easier to build the PGP hash if you separate the filename from the directory, as you ll see after Listing 7-10. If you wanted to make this target more general, you could pass a dir attribute to it from the calling target. Listing 7-10. The Hash-Generation Target <!-- Generate the hashes for a package --> <target name="generate-hashes" description="Generate the hashes for a package"> <echo message="Generating the hashes for ${file}"/> <checksum file="${dist}/${file}" forceOverwrite="true"/> <checksum file="${dist}/${file}" forceOverwrite="true" algorithm="SHA1"/> <!-- We want a fresh file --> <delete failonerror="false"> <fileset dir="." includes="**/${file}.asc"/> </delete> <!-- PGP creates a temporary file if it fails, so we use the scratch directory --> <exec executable="pgp" spawn="false" vmlauncher="false"> <arg value="+force"/> <arg value="+batchmode"/> <arg value="-s"/> <arg value="-b"/> <arg value="-o"/> <arg value="${build}/${file}.asc"/> <arg value="-z"/> <arg value="${pgp.password}"/> <arg value="${dist}/${file}"/> </exec> <!-- Copy the file to the distribution directory --> <copy file="${build}/${file}.asc" todir="${dist}" failonerror="false"/> </target>

static void DoBarWork() { Console.WriteLine("Inside the DoBarWork task"); } } } The output of this code in Figure 3 8 demonstrates that the tasks have been performed as desired.

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The <exec> task used in Listing 7-10 takes a little bit of explaining. First, the way Ant passes arguments to PGP means that the space before the filename in, for example, -o ${build}/ ${file}.asc will cause PGP to try to make a file called ' build/antBook-docs.zip.asc', including the spaces, which can t be done. To get around this, you have split the argument in two and send it to PGP one after the other. This means that order is important here. An alternative would be to do the following and eliminate the space: <arg value="-o${build}/${file}.asc"/> The +force and +batchmode command-line options are designed for situations where automatic or unattended processes try to generate hashes, which is exactly what you are doing here. The first one suppresses confirmation questions such as, Are you sure you want to overwrite this file The second removes, among other things, the prompt for a password if you forget to supply one or supply the wrong one. You d probably rather continue with the build in this case than have it hang waiting for a response. You won t get a PGP hash, but you will get MD5 and SHA1 hashes. When you run the packaging targets now, don t forget to set the -Dpgp.password option at the command line should you not want to place the pgp.password property in the build file (and you probably shouldn t).

The Logger object is the main object that an application developer uses to log any message. Once the logging information is passed to a logger, the rest is done behind the scenes. Logger objects only encapsulate logging messages and do not have any knowledge about the destination or the formatting of those messages. This is where the Appender and Layout objects come into the picture, as we will see in s 3 and 4. The Logger objects acting within a particular instance of an application follow a parent-child hierarchy. To illustrate this concept, consider Figure 2-2.

Task.Wait()

Note If you want to fail the build if PGP couldn t generate a hash, it s as simple as setting the <exec>

At the top of the hierarchy exists a root logger The root logger exists outside the scope of any custom logger hierarchy that we may come up with It always exists as the root logger for all possible logger hierarchies, and it has no namespace All the other application-specific Logger objects are child objects to the root logger The parent-child relationship of loggers signifies the dependency of the loggers acting within the same application A child logger can inherit properties from its parent logger recursively up the tree Typically, a child logger will inherit the following properties from its parent logger(s): Level: If the child logger has no explicit tree level specified, it will use the level of its closest parent or the first proper level it finds recursively up the hierarchy.

Earlier in the chapter we discussed the issues around synchronization; specifically, we saw examples where we spawned threads to perform a unit of work and found inconsistent results. Sometimes thead one completed before thread two, sometimes it was the other way around, and sometimes a thread didn t complete at all. TPL provides the Task.Wait() method as a way of ensuring order and synchronization. We can easily modify the code from Listing 3 1 to the way it appears in Listing 3 5, using the Wait() method to synchronize the tasks without having to place locks on any particular resource.

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