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/*
* Copyright (c) 2008, 2021, 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.io.File;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.ProtectionDomain;
/**
* 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)).toURI().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();
// Load additional classes when called from thread 'TestThread'
// When a class is loaded during a callback handling the boot loader, we can
// run into ClassCircularityError if the ClassFileLoadHook is set early enough
// to catch classes needed during class loading, e.g.
// sun.misc.URLClassPath$JarLoader$2.
// The goal of the test is to stress class loading on the test class loaders.
if (tName.equals("TestThread") && loader != null) {
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();
}
}
}
}
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