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/*
* 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.io.InputStream;
import java.lang.instrument.ClassDefinition;
import java.lang.instrument.Instrumentation;
import java.util.Timer;
import java.util.TimerTask;
public class RedefineClassWithNativeMethodAgent {
static Class clz;
// just read the original class and redefine it via a Timer
public static void premain(String agentArgs, final Instrumentation inst) throws Exception {
String s = agentArgs.substring(0, agentArgs.indexOf(".class"));
clz = Class.forName(s.replace('/', '.'));
InputStream in;
Module m = clz.getModule();
if (m != null) {
in = m.getResourceAsStream(agentArgs);
} else {
ClassLoader loader =
RedefineClassWithNativeMethodAgent.class.getClassLoader();
in = loader.getResourceAsStream(agentArgs);
}
if (in == null) {
throw new Exception("Cannot find class: " + agentArgs);
}
byte[] buffer = in.readAllBytes();
new Timer(true).schedule(new TimerTask() {
public void run() {
try {
System.out.println("Instrumenting");
ClassDefinition cld = new ClassDefinition(clz, buffer);
inst.redefineClasses(new ClassDefinition[] { cld });
}
catch (Exception e) { e.printStackTrace(); }
}
}, 500);
}
}
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