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CHAPTER 3 BUILDING WITH ANT
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Buildfile: build.xml Target A: [echo] Performing Step A BUILD SUCCESSFUL Total time: 1 second
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Targets are meant to represent a discrete step in the build process. Targets use tasks, datatypes, and property declarations to accomplish their work. Targets are required to have a name attribute and an optional comma-separated list of dependent targets.
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Best Practice Use simple action verbs to name your targets, such as build, test, or deploy.
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A typical buildfile is composed of several main targets: those that are meant to be called directly by the user and subtargets, which are targets that provide functionality to a main target.
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Best Practice Add a description attribute to a build s main targets. Targets containing a description are shown in the automatic project help, which is displayed when Ant is invoked with the -p or -projecthelp command-line options. For subtargets, prefix the name with a hyphen to make it easy to differentiate them from main targets.
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Targets can be conditionally executed, and for this purpose Ant supports the if and unless attributes. Targets using either or both of these are said to be conditional targets. Both if and unless take the name of a property as a value, which is a test for existence. You can see an example of this if you modify Target A from the sample buildfile and add an if attribute with a value of do_a as shown in Listing 3-2. Listing 3-2. Conditional Ant Target <target name="Target A" description="Performs Step A" if="do_a"> <echo>Performing Step A</echo> </target>
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CHAPTER 3 BUILDING WITH ANT
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The target should be executed only if the Ant property by the name do_a exists in the context of the build. Executing the buildfile produces the following result: Buildfile: build.xml Target A: Target B: [echo] Performing Step B [echo] Echo is one of many Core Tasks Target C: [echo] Performing Step C BUILD SUCCESSFUL Total time: 1 second Notice that the output shows the banner for Target A but that the echo tasks contained within were never executed. You can run the buildfile again using the -D option to pass the property do_a to the build as shown: ant -D "do_a=" The output now shows that Target A is being executed. You add the double quotes around the name-value pairs for the command-line argument parser so you can recognize the end of the argument. Any value could have been passed and the results would have been the same. Remember with if and unless, the value of the property is irrelevant; what matters is whether or not the property has been defined.
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Target Dependencies
From the simple buildfile shown previously you can see that targets can depend on other targets. This example shows a very simple and linear dependency chain in which Target C depends on Target B, which in turn depends on Target A. Ant will resolve any circular dependencies and will consequently fail the build. For example, you can modify the sample script to add Target C as a dependency of Target A as shown in Listing 3-3. Listing 3-3. Ant Target Dependencies <target name="Target A" depends="Target C" description="Performs Step A"> <echo>Performing Step A</echo> </target>
CHAPTER 3 BUILDING WITH ANT
The resulting execution of the script will produce output similar to the following: Buildfile: build.xml BUILD FAILED Circular dependency: Target C <- Target A <- Target B <- Target C Total time: 1 second Dependencies are resolved recursively using a topological sorting algorithm. The resulting build sequence ensures that a target in the dependency chain will only get executed once. You can see a great example of this in the Ant online manual, which shows a build with dependencies as shown in Figure 3-2.
Figure 3-2. Script dependencies A buildfile for the build in Figure 3-2 would look like Listing 3-4. Listing 3-4. Simple Ant Buildfile Showing Dependencies < xml version="1.0" encoding="UTF-8" > <project basedir="." default="D" name="dependencies"> <target name="A"/> <target name="B" depends="A"/> <target name="C" depends="B,A"/> <target name="D" depends="C,B,A"/> </project> Understanding how dependencies work is very important as your build process grows in complexity. Figure 3-3 shows a depiction of the dependency resolution process.
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