create barcode using vb.net Figure 10.1 Custom <splash> display, showing the build progress along the bottom in Java

Encoder DataMatrix in Java Figure 10.1 Custom <splash> display, showing the build progress along the bottom

Figure 10.1 Custom <splash> display, showing the build progress along the bottom
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This task has potential for abuse, though, and it provides nothing functional to the build. It would be wrong to incorporate it into automated build processes, which run unattended. It is cute, though! This build file demonstrates its use:
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<project name="splash" default="main"> <target name="init"> <splash imageurl="http://www.ehatchersolutions.com/logo.gif" showduration="5000"/> <sleep seconds="1"/> <sleep seconds="1"/> <sleep seconds="1"/> <sleep seconds="1"/> <sleep seconds="1"/> <sleep seconds="1"/> </target> <target name="main" depends="init"/> </project>
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The <sleep> tasks were added to demonstrate the progress bar moving as the build progresses. Note that while the progress bar along the bottom progresses as the build proceeds, it is not an indicator of how much work there is remaining. 10.2.3 Adding dependency checks The <javac> dependency logic to ensure that out-of-date classes are recompiled during incremental builds implements a rudimentary check that only passes .java files to the compiler if the corresponding .class file is older or nonexistent. It does not rebuild classes when the files that they depend upon change, such as a parent class or an imported class. The <depend> task looks at the generated class files, extracts the references to other classes from these files, and then deletes the class files if any of their dependencies are newer. This clears out files for <javac> to rebuild. One fly in the ointment is that because compile-time constants, such as primitive datatype values and string literals, are inlined at compile time, neither <javac> nor <depend> can tell when a definition such as Constants.DEBUG_BUILD has changed from true to false. Projects that do not have a substantial number of .java files can get away with simply doing a clean build and recompiling their entire source to ensure all is in sync. In situations where there is a large number of Java source files and the time to rebuild the entire source tree is prohibitive, the <depend> task is a great benefit to ensure incremental builds are as in sync as possible. Adding the dependency check to the build process is fairly simple; we just paste it in to the compile target above the <javac> call, as shown here:
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<target name="compile" depends="init,release-settings"> <depend srcdir="${src.dir}" destdir="${build.dir}/classes"
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cache="${build.dir}/dependencies" closure="true"> <classpath> <pathelement location="${antbook-ant.jar}"/> <pathelement location="${antbook-common.jar}"/> </classpath> </depend> <javac destdir="${build.dir}/classes" debug="${build.debug}" includeAntRuntime="no" srcdir="src"> <classpath refid="compile.classpath"/> </javac> </target>
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We inserted <depend> inside the compile target as it is only ever needed before the <javac> call; there was little merit in providing a separate target. We considered writing a reusable target, either by pasting a new target into our shared targets.xml file, or by writing a stand-alone library build file. The former is easier to integrate with compile, just another dependency in the target s list; the latter is more reusable. We refrained from either action until we had integrated it into all the targets, to see how much classpath variation there was, and so determine what parameters to support. The two mandatory attributes of the <depend> task are srcdir, which points to the Java source, and destdir, which points to the classes. The cache attribute names a directory that is used to cache dependency information between runs. The task looks inside the class files to determine which classes they depend on, and as this information does not change when the source is unchanged, it can be safely cached from run to run to speed up the process. Because it does speed up the process, we highly recommend you always specify a cache directory. The final attribute we are using is closure, which tells the task whether to delete .class files if an indirect dependency has changed. The merits of this one are unclear: it may be safer to set closure=true, but faster to leave it unset. There is also a nested attribute to specify a classpath. This is not mandatory; <depend> is not compiling the source and it does not need to know where all the packages the source depends upon are stored. Instead, the task uses any supplied classpath as a list of classes that may also have changed, and so dictate a rebuild of the local source. It looks inside JAR files to see the timestamps of the classes therein, deleting local .class files if needed classes in the JAR have changed. For speed, we only list the JAR files that our sibling projects create; a change in an external library such as ant.jar or lucene.jar is not detected. We usually only rebuild those libraries from their CVS repositories once a day, and we know to run a clean build of our own projects afterwards. You can also include or exclude source files from the dependency checking by using nested <includes> and <excludes> elements. We have never done this, because, like <javac>, the task includes all Java files under the source directory automatically, and we have always wanted to check the dependency of our entire source.
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