71 lines
2.8 KiB
Java
71 lines
2.8 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.util.*;
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import java.io.*;
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public class RedefineClassWithNativeMethodAgent {
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static Class clz;
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// just read the original class and redefine it via a Timer
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public static void premain(String agentArgs, final Instrumentation inst) throws Exception {
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String s = agentArgs.substring(0, agentArgs.indexOf(".class"));
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clz = Class.forName(s.replace('/', '.'));
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ClassLoader loader =
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RedefineClassWithNativeMethodAgent.class.getClassLoader();
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URL classURL = loader.getResource(agentArgs);
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if (classURL == null) {
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throw new Exception("Cannot find class: " + agentArgs);
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}
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int redefineLength;
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InputStream redefineStream;
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System.out.println("Reading test class from " + classURL);
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if (classURL.getProtocol().equals("file")) {
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File f = new File(classURL.getFile());
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redefineStream = new FileInputStream(f);
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redefineLength = (int) f.length();
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} else {
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URLConnection conn = classURL.openConnection();
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redefineStream = conn.getInputStream();
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redefineLength = conn.getContentLength();
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}
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final byte[] buffer = new byte[redefineLength];
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new BufferedInputStream(redefineStream).read(buffer);
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new Timer(true).schedule(new TimerTask() {
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public void run() {
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try {
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System.out.println("Instrumenting");
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ClassDefinition cld = new ClassDefinition(clz, buffer);
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inst.redefineClasses(new ClassDefinition[] { cld });
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}
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catch (Exception e) { e.printStackTrace(); }
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}
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}, 500);
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}
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}
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