| /* |
| * Copyright (c) 2011, 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.util.*; |
| |
| public class RetransformBigClassAgent { |
| private static int N_RETRANSFORMS = 1000; |
| public static Class clz; |
| public static volatile boolean doneRetransforming = false; |
| |
| // just retransform the class in a loop 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('/', '.')); |
| |
| ClassFileTransformer trans = new SimpleIdentityTransformer(); |
| inst.addTransformer(trans, true /* canRetransform */); |
| |
| System.gc(); // throw away anything we can before we start testing |
| |
| new Timer(true).schedule(new TimerTask() { |
| public void run() { |
| try { |
| int i; |
| System.out.println("Retransforming"); |
| for (i = 0; i < N_RETRANSFORMS; i++) { |
| inst.retransformClasses(clz); |
| System.gc(); // throw away anything we can |
| } |
| System.out.println("Retransformed " + i + " times."); |
| RetransformBigClassAgent.doneRetransforming = true; |
| } |
| catch (Exception e) { e.printStackTrace(); } |
| } |
| }, 500); |
| } |
| } |