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/*
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* Copyright (c) 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.lang.instrument.ClassFileTransformer;
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import java.lang.instrument.IllegalClassFormatException;
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import java.lang.instrument.Instrumentation;
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import java.security.ProtectionDomain;
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import java.util.HashMap;
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// This is a test utility class used to transform
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// specified classes via initial transformation (ClassFileLoadHook).
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// Names of classes to be transformed are supplied as arguments,
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// the phrase to be transformed is a hard-coded predefined
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// fairly unique phrase.
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public class TransformerAgent {
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private static String[] classesToTransform;
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private static void log(String msg) {
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System.out.println("TransformerAgent: " + msg);
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}
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// arguments are comma-separated list of classes to transform
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public static void premain(String agentArguments, Instrumentation instrumentation) {
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log("premain() is called, arguments = " + agentArguments);
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classesToTransform = agentArguments.split(",");
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instrumentation.addTransformer(new SimpleTransformer(), /*canRetransform=*/true);
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}
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public static void agentmain(String args, Instrumentation inst) throws Exception {
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log("agentmain() is called");
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premain(args, inst);
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}
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static class SimpleTransformer implements ClassFileTransformer {
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public byte[] transform(ClassLoader loader, String name, Class<?> classBeingRedefined,
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ProtectionDomain pd, byte[] buffer) throws IllegalClassFormatException {
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log("SimpleTransformer called for: " + name + "@" + incrCounter(name));
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if (!shouldTransform(name))
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return null;
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log("transforming: class name = " + name);
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int nrOfReplacements = TransformUtil.replace(buffer, TransformUtil.BeforePattern,
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TransformUtil.AfterPattern);
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log("replaced the string, nrOfReplacements = " + nrOfReplacements);
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return buffer;
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}
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// Check class name pattern, since test should only transform certain classes
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private static boolean shouldTransform(String name) {
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for (String match : classesToTransform) {
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if (name.matches(match)) {
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log("shouldTransform: match-found, match = " + match);
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return true;
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}
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}
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return false;
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}
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}
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static HashMap<String, Integer> counterMap = new HashMap<>();
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static Integer incrCounter(String className) {
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Integer i = counterMap.get(className);
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if (i == null) {
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i = new Integer(1);
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} else {
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i = new Integer(i.intValue() + 1);
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}
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counterMap.put(className, i);
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return i;
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}
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}
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