/*

 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.lang.instrument.*;

import java.net.*;

import java.io.*;

import java.security.*;

/**

 *      Test Java Agent

 *

 *      @author Daryl Puryear

 *      @copyright 1999-2004 Wily Technology, Inc.  All rights reserved.

 */

public class ParallelTransformerLoaderAgent

{

        private static URL sURL;

        private static ClassLoader sClassLoader;

        public static synchronized ClassLoader

        getClassLoader()

        {

                return sClassLoader;

        }

        public static synchronized void

        generateNewClassLoader()

        {

                sClassLoader = new URLClassLoader(new URL[] {sURL});

        }

        public static void

        premain(        String agentArgs,

                        Instrumentation instrumentation)

                throws Exception

        {

                if (agentArgs == null || agentArgs == "")

                {

                        System.err.println("Error: No jar file name provided, test will not run.");

                        return;

                }

                sURL = (new File(agentArgs)).toURL();

                System.out.println("Using jar file: " + sURL);

                generateNewClassLoader();

                instrumentation.addTransformer(new TestTransformer());

        }

        private static class TestTransformer

                implements ClassFileTransformer

        {

                public byte[]

                transform(      ClassLoader loader,

                                String className,

                                Class classBeingRedefined,

                                ProtectionDomain protectionDomain,

                                byte[] classfileBuffer)

                        throws IllegalClassFormatException

                {

                        String tName = Thread.currentThread().getName();

                        // In 160_03 and older, transform() is called

                        // with the "system_loader_lock" held and that

                        // prevents the bootstrap class loaded from

                        // running in parallel. If we add a slight sleep

                        // delay here when the transform() call is not

                        // main or TestThread, then the deadlock in

                        // 160_03 and older is much more reproducible.

                        if (!tName.equals("main") && !tName.equals("TestThread")) {

                            System.out.println("Thread '" + tName +

                                "' has called transform()");

                            try {

                                Thread.sleep(500);

                            } catch (InterruptedException ie) {

                            }

                        }

                        // load additional classes when called from other threads

                        if (!tName.equals("main"))

                        {

                                loadClasses(3);

                        }

                        return null;

                }

                public static void

                loadClasses( int index)

                {

                        ClassLoader loader = ParallelTransformerLoaderAgent.getClassLoader();

                        try

                        {

                                Class.forName("TestClass" + index, true, loader);

                        }

                        catch (Exception e)

                        {

                                e.printStackTrace();

                        }

                }

        }

}