| /* |
| * 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(); |
| } |
| } |
| } |
| } |