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/** * Ensure that the <code>outputDirectory</code> does not exist. * * <p> * The framework requires that the output directory not be present at job * submission time. * </p> * <p> * This method also demonstrates how to remove a directory using the * {@link FileSystem} API. * </p> * * @param conf * The configuration object. This is needed to know what file * systems and file system plugins are being used. * @param outputDirectory * The directory that must be removed if present. * @return true if the the <code>outputPath</code> is now missing, or * false if the <code>outputPath</code> is present and was unable * to be removed. * @throws IOException * If there is an error loading or configuring the FileSystem * plugin, or other IO error when attempting to access or remove * the <code>outputDirectory</code>. */ protected static boolean removeIf(final JobConf conf, final Path outputDirectory) throws IOException { /** This is standard way to acquire a FileSystem object. */ final FileSystem fs = outputDirectory.getFileSystem(conf); /** * If the <code>outputDirectory</code> does not exist this method is * done. */ if (!fs.exists(outputDirectory)) { if (logger.isDebugEnabled()) { logger .debug("The output directory does not exist," + " no removal needed."); } return true; } /** * The getFileStatus command will throw an IOException if the path does * not exist. */

In our example, we can t have a squareThenAdd function, since square takes only one argument and returns one value while add needs two arguments And since JavaScript only allows for one return value, combined functions are usually limited to functions that take a single argument..

That s the whirlwind tour. Hopefully it s helped you understand the InfoPath client from the user s view. From here, we ll dive into the designer and the forms capabilities for the power user and developer.

final FileStatus status = fs.getFileStatus(outputDirectory); logger.info("The job output directory " + outputDirectory.makeQualified(fs) + " exists" + (status.isDir() " and is not a directory" : "") + " and will be removed"); /** * Attempt to delete the file or directory. delete recursively just in * case <code>outputDirectory</code> is a directory with * sub-directories. */ if (!fs.delete(outputDirectory, true)) { logger.error("Unable to delete the configured output directory " + outputDirectory); return false; } /** The outputDirectory did exist, but has now been removed. */ return true; } /** * bean access setter to the {@link inputDirectory} field. * * @param inputDirectory * The value to set inputDirectory to. */ public static void setInputDirectory(final Path inputDirectory) { MapReduceIntroConfig.inputDirectory = inputDirectory; } /** * bean access setter for the {@link outpuDirectory field. * * @param outputDirectory * The value to set outputDirectory to. */ public static void setOutputDirectory(final Path outputDirectory) { MapReduceIntroConfig.outputDirectory = outputDirectory; } } First, you must create a JobConf object. It is good practice to pass in a class that is contained in the JAR file that has your map and reduce functions. This ensures that the framework will make the JAR available to the map and reduce tasks run for your job.

You ll notice that, so far, much of our discussion has centered on functions in the context of JavaScript, and MooTools is strangely out of the picture. This is not so unusual if you remember that MooTools doesn t try to turn JavaScript into something else but rather uses the available features of the language to make it more powerful. The information we ve learned so far is core to how MooTools implements new features, and a cursory glance at the MooTools source code will show its extensive use of features like single execution functions for limiting scope, closures, currying, and decoration and other techniques. In the next sections, we ll take a look at some of the features that MooTools adds to functions, and see how they can be used for our own applications.

JobConf conf = new JobConf(MapReduceIntro.class); Now that you have a JobConfig object, conf, you need to set the required parameters for the job. These include the input and output directory locations, the format of the input and output, and the mapper and reducer classes. All jobs will have a map phase, and the map phase is responsible for handling the job input. The configuration of the map phase requires you to specify the input locations and the class that will produce the key/value pairs from the input, the mapper class, and potentially, the suggested number of map tasks, map output types, and per-map task threading, as listed in Table 2-2. Table 2-2. Map Phase Configuration

his chapter will tour the InfoPath designer, cover some of the basics, and generally try to fully cover all the design features of InfoPath. It will cover some basic design concepts and tour the InfoPath form designer features. This is the entry point for building everything from basic data entry forms to powerful enterprise e-forms.