| /* |
| * 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.net.*; |
| import java.util.*; |
| import java.io.*; |
| |
| public class RedefineBigClassAgent { |
| // N_REDEFINES = 2000 made my Solaris X86 box crawl on its knees |
| // with the Server VM. The timeout is 600 seconds, but the test |
| // ran for 675 seconds so it took the harness 75 seconds to kill |
| // the test. |
| private static int N_REDEFINES = 1000; |
| public static Class clz; |
| public static volatile boolean doneRedefining = false; |
| |
| // just read the original class and redefine 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('/', '.')); |
| ClassLoader loader = |
| RedefineBigClassAgent.class.getClassLoader(); |
| URL classURL = loader.getResource(agentArgs); |
| if (classURL == null) { |
| throw new Exception("Cannot find class: " + agentArgs); |
| } |
| |
| int redefineLength; |
| InputStream redefineStream; |
| |
| System.out.println("Reading test class from " + classURL); |
| if (classURL.getProtocol().equals("file")) { |
| File f = new File(classURL.getFile()); |
| redefineStream = new FileInputStream(f); |
| redefineLength = (int) f.length(); |
| } else { |
| URLConnection conn = classURL.openConnection(); |
| redefineStream = conn.getInputStream(); |
| redefineLength = conn.getContentLength(); |
| } |
| |
| final byte[] buffer = new byte[redefineLength]; |
| new BufferedInputStream(redefineStream).read(buffer); |
| |
| 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("Redefining"); |
| ClassDefinition cld = new ClassDefinition(clz, buffer); |
| for (i = 0; i < N_REDEFINES; i++) { |
| inst.redefineClasses(new ClassDefinition[] { cld }); |
| System.gc(); // throw away anything we can |
| } |
| System.out.println("Redefined " + i + " times."); |
| RedefineBigClassAgent.doneRedefining = true; |
| } |
| catch (Exception e) { e.printStackTrace(); } |
| } |
| }, 500); |
| } |
| } |