Example usage for com.google.gwt.dev WindowsExternalPermutationWorkerFactory CLASS_PATH_FILE_PROPERTY

Introduction

In this page you can find the example usage for com.google.gwt.dev WindowsExternalPermutationWorkerFactory CLASS_PATH_FILE_PROPERTY.

Prototype

String CLASS_PATH_FILE_PROPERTY

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Document

The name of the system property used to define the classpath file.

Usage

From source file:org.codehaus.mojo.gwt.shell.WindowsCommandLineLauncher.java

License:Apache License

public static void main(String[] args)
        throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException,
        IOException, InstantiationException, NoSuchFieldException {

    //Extract arguments
    final String classPathFileName = args[0];
    final String className = args[1];
    final String[] additionalArguments = new String[args.length - 2];
    for (int i = 2; i < args.length; i++) {
        additionalArguments[i - 2] = args[i];
    }/*from   w  ww .j  a va  2 s  .  co m*/

    final File classPathFile = new File(classPathFileName);
    final List<URL> urls = new ArrayList<URL>();

    //Copy in SystemClassLoader entries
    final String[] systemClassLoaderClassPath = ManagementFactory.getRuntimeMXBean().getClassPath()
            .split(File.pathSeparator);
    for (String classPathEntry : systemClassLoaderClassPath) {
        urls.add(new File(classPathEntry).toURI().toURL());
    }

    //Read classpath from file
    final BufferedReader input = new BufferedReader(new FileReader(classPathFile));
    try {
        String classPathEntry = null;
        while ((classPathEntry = input.readLine()) != null) {
            urls.add(new File(classPathEntry).toURI().toURL());
        }
    } finally {
        input.close();
    }

    //Set-up URLClassLoader using classpath extracted from the file. Null parent class-loader is important!
    final URL[] a = urls.toArray(new URL[urls.size()]);
    final ClassLoader loader = new URLClassLoader(a, null);

    //Setup new WorkerFactory
    System.setProperty(PermutationWorkerFactory.FACTORY_IMPL_PROPERTY,
            ThreadedPermutationWorkerFactory.class.getName() + ","
                    + WindowsExternalPermutationWorkerFactory.class.getName());

    //Record classpath file needed by com.google.gwt.dev.WindowsExternalPermutationWorkerFactory
    System.setProperty(WindowsExternalPermutationWorkerFactory.CLASS_PATH_FILE_PROPERTY,
            classPathFile.getAbsolutePath());

    //Load real class
    final Class mainClass = loader.loadClass(className);

    //Invoke real class's main method
    Thread.currentThread().setContextClassLoader(loader);

    final Class mainMethodArgumentsType = String[].class;
    final Method mainMethod = mainClass.getMethod("main", new Class[] { mainMethodArgumentsType });

    // this is SO UGLY...
    Field scl = ClassLoader.class.getDeclaredField("scl");
    scl.setAccessible(true);
    scl.set(null, loader); // needed due to the possible Xerces conflicts as GWT uses system classloader to load these

    mainMethod.invoke(null, new Object[] { additionalArguments });
}

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