59 lines
2.4 KiB
Java
59 lines
2.4 KiB
Java
/*
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* Copyright (c) 2011, 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.*;
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import java.util.*;
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public class RetransformBigClassAgent {
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private static int N_RETRANSFORMS = 1000;
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public static Class clz;
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public static volatile boolean doneRetransforming = false;
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// just retransform the class in a loop 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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ClassFileTransformer trans = new SimpleIdentityTransformer();
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inst.addTransformer(trans, true /* canRetransform */);
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System.gc(); // throw away anything we can before we start testing
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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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int i;
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System.out.println("Retransforming");
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for (i = 0; i < N_RETRANSFORMS; i++) {
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inst.retransformClasses(clz);
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System.gc(); // throw away anything we can
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}
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System.out.println("Retransformed " + i + " times.");
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RetransformBigClassAgent.doneRetransforming = true;
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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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