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Figure 9.2 The dependency graph of our projects. To avoid a loop (which must always have existed), the tests of the common file had to be pulled out into a separate build file.
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This graph is slightly different from the order in listing 9.2. In altering the project common so that we could use the index files created by index for its tests, it became dependent upon that index project. This showed up that we always must have had a circular dependency: the ant project depended upon common, but the test target in common depended upon ant. We hadn t noticed this before because we only clean-built individual projects, not the entire suite. To remove the loop, we moved the tests into the file common-tests and made the test target in common do nothing. The final outputs of the project still depend on passing these tests, which is why webapp and tools depend upon the common-tests project. We can now rework our single master build target to become a parameterized target that builds the projects, which we show in listing 9.2.
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Listing 9.2 A target-independent master build target
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<target name="do-all-builds" > <ant dir="common" inheritAll="false" target="${target}"/> <ant dir="ant" inheritAll="false" target="${target}"/> <ant dir="index" inheritAll="false" target="${target}"/> <ant dir="common" antfile="common-test.xml" inheritAll="false" target="${target}"/> <ant dir="tools" inheritAll="false" target="${target}"/> <ant dir="webapp" inheritAll="false" target="${target}"/> </target>
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When calling the common-test build file, we have to specify the name of the file as well as the directory in which it exists. When the file you are calling with <ant> is called build.xml, as those of most projects are, then specifying the directory is all you need to do. When you want to call a build file with a different name, then you state the name in the antfile attribute, and the directory in which it is to execute. The name must be relative to the directory in the dir attribute. We will explain later, in our discussion of library build files, why the dir attribute should always be specified when naming a file. For now, take our word that naming the directory containing the build file is a sensible action. 218
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USING ANT IN YOUR DEVELOPMENT PROJECTS
We can then write the well-known entry points to the build file, each invoking the
do-all target, setting the target parameter to the name of the target to execute in every build file. For example, here is the noop target.
<target name="noop" description="do nothing"> <antcall target="do-all-builds"> <param name="target" value="noop"/> </antcall> </target>
To show it works, we call this target, which will trace out the projects as we execute them:
app$ ant noop Buildfile: build.xml noop: do-all: noop: [echo] no-op in noop: [echo] no-op in noop: [echo] no-op in noop: [echo] no-op in noop: [echo] no-op in noop: [echo] no-op in BUILD SUCCESSFUL
AntBook - Common AntBook - Custom Ant Tasks AntBook - Index AntBook - Common - Test Antbook - Tools AntBook - Web App
At this point, we can use the master build file to provide a unifying build of our project, adding new entry points for each target name defined in table 9.4. We have lost all the explicit dependency information, but the build file works. Writing the invocation targets Even with only a few child projects, our build files are getting complex dependencies between them. This may be a symptom of inadequate decoupling of components, but as a project grows, this trend will only continue; having to order everything ourselves will only get more difficult over time. We need to hand off ordering build file invocation to Ant itself. It can detect circular dependencies or build the targets in a valid sequence. We just have to create a set of proxy targets, one for each child project, as shown in listing 9.3.
Listing 9.3 Our proxy targets: one per build file, with all direct predecessors stated
<target name="do-common"> <ant dir="common" target="${target}" inheritAll="false"/> </target>
MASTER BUILDS: MANAGING LARGE PROJECTS
<target name="do-ant" depends="do-common"> <ant dir="ant" target="${target}" inheritAll="false"/> </target> <target name="do-index" depends="do-ant"> <ant dir="index" target="${target}" inheritAll="false"/> </target> <target name="do-common-test" depends="do-index,do-common"> <ant dir="common" antfile="common-test.xml" target="${target}" inheritAll="false"/> </target> <target name="do-tools" depends="do-common,do-index,do-common-test"> <ant dir="tools" target="${target}" inheritAll="false"/> </target> <target name="do-webapp" depends="do-common,do-index,do-common-test"> <ant dir="webapp" target="${target}" inheritAll="false"/> </target> <target name="do-all" depends="do-tools,do-common-test,do-webapp"/>
The body of each of these targets is one of the individual task declarations of the unified master build target of listing 9.2. We have increased the line count, but also increased flexibility. We can now define high-level master build targets that depend upon some, but not all, of the subprojects. And we can easily add new subprojects by adding new proxy targets and setting up the appropriate dependencies. Running the master build Having written the proxy targets, we need to write the entry points for the master build. We have already introduced the noop target; the others are nearly identical. Of course, the internal target we invoke (do-all) is new; we make this change to all the entry points.
<target name="all" description="build everything"> <antcall target="do-all"> <param name="target" value="all"/> </antcall> </target>
First, we test the noop target:
$ ant noop Buildfile: build.xml noop:
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