121 lines
4.5 KiB
Java
121 lines
4.5 KiB
Java
/*
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* Copyright 2008 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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import java.lang.instrument.*;
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import java.net.*;
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import java.io.*;
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import java.security.*;
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/**
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* Test Java Agent
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*
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* @author Daryl Puryear
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* @copyright 1999-2004 Wily Technology, Inc. All rights reserved.
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*/
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public class ParallelTransformerLoaderAgent
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{
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private static URL sURL;
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private static ClassLoader sClassLoader;
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public static synchronized ClassLoader
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getClassLoader()
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{
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return sClassLoader;
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}
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public static synchronized void
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generateNewClassLoader()
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{
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sClassLoader = new URLClassLoader(new URL[] {sURL});
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}
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public static void
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premain( String agentArgs,
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Instrumentation instrumentation)
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throws Exception
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{
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if (agentArgs == null || agentArgs == "")
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{
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System.err.println("Error: No jar file name provided, test will not run.");
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return;
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}
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sURL = (new File(agentArgs)).toURL();
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System.out.println("Using jar file: " + sURL);
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generateNewClassLoader();
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instrumentation.addTransformer(new TestTransformer());
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}
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private static class TestTransformer
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implements ClassFileTransformer
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{
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public byte[]
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transform( ClassLoader loader,
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String className,
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Class classBeingRedefined,
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ProtectionDomain protectionDomain,
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byte[] classfileBuffer)
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throws IllegalClassFormatException
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{
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String tName = Thread.currentThread().getName();
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// In 160_03 and older, transform() is called
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// with the "system_loader_lock" held and that
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// prevents the bootstrap class loaded from
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// running in parallel. If we add a slight sleep
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// delay here when the transform() call is not
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// main or TestThread, then the deadlock in
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// 160_03 and older is much more reproducible.
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if (!tName.equals("main") && !tName.equals("TestThread")) {
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System.out.println("Thread '" + tName +
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"' has called transform()");
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try {
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Thread.sleep(500);
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} catch (InterruptedException ie) {
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}
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}
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// load additional classes when called from other threads
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if (!tName.equals("main"))
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{
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loadClasses(3);
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}
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return null;
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}
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public static void
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loadClasses( int index)
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{
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ClassLoader loader = ParallelTransformerLoaderAgent.getClassLoader();
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try
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{
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Class.forName("TestClass" + index, true, loader);
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}
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catch (Exception e)
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{
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e.printStackTrace();
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}
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}
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}
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}
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