Glassfish example source code file (PersistenceLauncher.java)

This example Glassfish source code file (PersistenceLauncher.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

class, exception, illegalaccessexception, illegalargumentexception, io, noi18n, noi18n, persistencelauncher, persistencelauncher, printwriter, properties, reflection, seen, seen, string, string, util

The Glassfish PersistenceLauncher.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

/*
 * PersistenceLauncher.java
 *
 * Created on July 3, 2000, 8:22 AM
 */

package com.sun.jdo.api.persistence.enhancer;

import java.util.Properties;

import java.io.PrintWriter;

import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;

import com.sun.jdo.api.persistence.enhancer.util.Support;


/**
 * Application launcher for persistence-capable classes.
 * @author Martin Zaun
 * @version 1.1
 */
public class PersistenceLauncher {

    // chose whether to separate or join out and err channels
    //static private final PrintWriter err = new PrintWriter(System.err, true);
    static private final PrintWriter err = new PrintWriter(System.out, true);
    static private final PrintWriter out = new PrintWriter(System.out, true);
    static private final String prefix = "PersistenceLauncher.main() : ";//NOI18N

    /**
     * Creates new PersistenceLauncher.
     */
    private PersistenceLauncher() {
    }

    /**
     * Prints usage message.
     */
    static void usage()
    {
        out.flush();
        err.println("PersistenceLauncher:");
        err.println("    usage: <options> ...   ...");
        err.println("    options:");
        err.println("           -h | --help");
        err.println("           -n | --noEnhancement");
        err.println("           -q | --quiet");
        err.println("           -w | --warn");
        err.println("           -d | --debug");
        err.println("           -t | --timing");
        err.println("    class names have to be fully qualified");
        err.println("done.");
        err.println();
        err.flush();
    }

    /**
     * Creates a class loader and launches a target class.
     * @param args the command line arguments
     */
    public static void main(String[] args)
        throws ClassNotFoundException,
        NoSuchMethodException,
        SecurityException,
        IllegalAccessException,
        IllegalArgumentException,
        InvocationTargetException {
/*
        message("property PersistenceExecutor.TAG_REPOSITORY = "
                + System.getProperty("PersistenceExecutor.TAG_REPOSITORY"));
        message("property PersistenceExecutor.TAG_CLASSPATH = "
                + System.getProperty("PersistenceExecutor.TAG_CLASSPATH"));
        message("property PersistenceExecutor.TAG_LIBRARY = "
                + System.getProperty("PersistenceExecutor.TAG_LIBRARY"));
        message("property PersistenceExecutor.TAG_CLASSNAME = "
                + System.getProperty("PersistenceExecutor.TAG_CLASSNAME"));
*/

        // get launcher options
        final String classpath = System.getProperty("java.class.path");
        boolean noEnhancement = false;
        boolean debug = false;
        boolean timing = false;
        Properties enhancerSettings = new Properties();
        String targetClassname = null;
        String[] targetClassArgs = null;
        for (int i = 0; i < args.length; i++) {
            String arg = args[i];
            if (arg.equals("-h")//NOI18N
                || arg.equals("--help")) {//NOI18N
                usage();

                // exit gently
                return;
            }
            if (arg.equals("-n")//NOI18N
                || arg.equals("--noEnhancement")) {//NOI18N
                noEnhancement = false;
                continue;
            }
            if (arg.equals("-t")//NOI18N
                || arg.equals("--timing")) {//NOI18N
                timing = true;
                enhancerSettings.setProperty(EnhancerClassLoader.DO_SIMPLE_TIMING,
                                             "true");//NOI18N
                continue;
            }
            if (arg.equals("-d")//NOI18N
                || arg.equals("--debug")) {//NOI18N
                debug = true;
                enhancerSettings.setProperty(EnhancerClassLoader.VERBOSE_LEVEL,
                                             EnhancerClassLoader.VERBOSE_LEVEL_DEBUG);
                continue;
            }
            if (arg.equals("-w")//NOI18N
                || arg.equals("--warn")) {//NOI18N
                debug = false;
                enhancerSettings.setProperty(EnhancerClassLoader.VERBOSE_LEVEL,
                                             EnhancerClassLoader.VERBOSE_LEVEL_WARN);
                continue;
            }
            if (arg.equals("-q")//NOI18N
                || arg.equals("--quiet")) {//NOI18N
                debug = false;
                enhancerSettings.setProperty(EnhancerClassLoader.VERBOSE_LEVEL,
                                             EnhancerClassLoader.VERBOSE_LEVEL_QUIET);
                continue;
            }

            // get target class name
            targetClassname = arg;

            // copy remaining arguments and leave loop
            i++;
            final int length = args.length - i;
            targetClassArgs = new String[length];
            System.arraycopy(args, i, targetClassArgs, 0, length);
            break;
        }

        // debugging oputput
        if (debug) {
            out.println(prefix + "...");//NOI18N
            out.println("settings and arguments:");//NOI18N
            out.println("    classpath = " + classpath);//NOI18N
            out.println("    noEnhancement = " + noEnhancement);//NOI18N
            out.println("    debug = " + debug);//NOI18N
            out.println("    enhancerSettings = {");//NOI18N
            enhancerSettings.list(out);
            out.println("    }");//NOI18N
            out.println("    targetClassname = " + targetClassname);//NOI18N
            out.print("    targetClassArgs = { ");//NOI18N
            for (int i = 0; i < targetClassArgs.length; i++) {
                out.print(targetClassArgs[i] + " ");//NOI18N
            }
            out.println("}");//NOI18N
        }

        // check options
        if (targetClassname == null) {
            usage();
            throw new IllegalArgumentException("targetClassname == null");//NOI18N
        }

        // get class loader
        final ClassLoader loader;
        if (noEnhancement) {
            if (debug) {
                out.println(prefix + "using system class loader");//NOI18N
            }
            //out.println("using system class loader");
            loader = PersistenceLauncher.class.getClassLoader();
        } else {
            if (debug) {
                out.println(prefix + "creating enhancer class loader");//NOI18N
            }
            final Properties settings = enhancerSettings;
            final PrintWriter out = PersistenceLauncher.out;
            loader = new EnhancerClassLoader(classpath, settings, out);
        }

        // get target class' main method
        Class clazz;
        Method main;
        try {
            final String mname = "main";//NOI18N
            final Class[] mparams = new Class[]{ String[].class };
            final boolean init = true;
            if (debug) {
                out.println(prefix + "getting method "//NOI18N
                            + targetClassname + "." + mname + "(String[])");//NOI18N
            }
            clazz = Class.forName(targetClassname, init, loader);
            main = clazz.getDeclaredMethod(mname, mparams);
        } catch (ClassNotFoundException e) {
            // log exception only
            if (debug) {
                out.flush();
                err.println("PersistenceLauncher: EXCEPTION SEEN: " + e);
                e.printStackTrace(err);
                err.flush();
            }
            throw e;
        } catch (NoSuchMethodException e) {
            // log exception only
            if (debug) {
                out.flush();
                err.println("PersistenceLauncher: EXCEPTION SEEN: " + e);
                e.printStackTrace(err);
                err.flush();
            }
            throw e;
        } catch (SecurityException e) {
            // log exception only
            if (debug) {
                out.flush();
                err.println("PersistenceLauncher: EXCEPTION SEEN: " + e);
                e.printStackTrace(err);
                err.flush();
            }
            throw e;
        }

        // invoke target class' main method
        try {
            final Object[] margs = new Object[]{ targetClassArgs };
            if (debug) {
                out.println("invoking method " + clazz.getName()//NOI18N
                            + "." + main.getName() + "(String[])");//NOI18N
            }
            main.invoke(null, margs);
        } catch (IllegalAccessException e) {
            // log exception only
            if (debug) {
                out.flush();
                err.println("PersistenceLauncher: EXCEPTION SEEN: " + e);
                e.printStackTrace(err);
                err.flush();
            }
            throw e;
        } catch (IllegalArgumentException e) {
            // log exception only
            if (debug) {
                out.flush();
                err.println("PersistenceLauncher: EXCEPTION SEEN: " + e);
                e.printStackTrace(err);
                err.flush();
            }
            throw e;
        } catch (InvocationTargetException e) {
            // log exception only
            if (debug) {
                out.flush();
                err.println("PersistenceLauncher: EXCEPTION SEEN: " + e);
                e.printStackTrace(err);
                err.flush();
            }
            throw e;
        } finally {
            if (timing) {
                Support.timer.print();
            }
        }

        if (debug) {
            out.println(prefix + "done.");//NOI18N
            out.flush();
            err.flush();
        }
    }
}