1 /* 2 * Copyright (c) 2011, 2013 Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.io.*; 25 26 public class RedefineBigClassApp { 27 /** 28 * Memory leak is assumed, if application consumes more than specified amount of memory during its execution. 29 * The number is given in Kb. 30 */ 31 private static final long MEM_LEAK_THRESHOLD = 32 * 1024; // 32Mb 32 33 public static void main(String[] args) throws Exception { 34 System.out.println("Creating instance of " + 35 RedefineBigClassAgent.clz); 36 RedefineBigClassAgent.clz.newInstance(); 37 38 long vMemBefore = getVMemSize(); 39 int count = 0; 40 while (!RedefineBigClassAgent.doneRedefining) { 41 System.out.println("App loop count: " + ++count); 42 try { 43 Thread.sleep(10 * 1000); 44 } catch (InterruptedException ie) { 45 } 46 } 47 System.out.println("App looped " + count + " times."); 48 49 long vMemAfter = getVMemSize(); 50 if (vMemBefore == 0 || vMemAfter == 0) { 51 System.err.println("WARNING: Cannot perform memory leak detection on this OS"); 52 } else { 53 long vMemDelta = vMemAfter - vMemBefore; 54 if (vMemDelta > MEM_LEAK_THRESHOLD) { 55 System.err.println("FAIL: Virtual memory usage increased by " + vMemDelta + "Kb " + 56 "(greater than " + MEM_LEAK_THRESHOLD + "Kb)"); 57 System.exit(1); 58 } 59 System.err.println("PASS: Virtual memory usage increased by " + vMemDelta + "Kb " + 60 "(not greater than " + MEM_LEAK_THRESHOLD + "Kb)"); 61 } 62 System.exit(0); 63 } 64 65 /** 66 * Return size of virtual memory allocated to the process in Kb. 67 * Linux specific. On other platforms and in case of any errors return 0. 68 */ 69 private static long getVMemSize() { 70 71 // Refer to the Linux proc(5) man page for details about /proc/self/stat file 72 // 73 // In short, this file contains status information about the current process 74 // written in one line. The fields are separated with spaces. 75 // The 23rd field is defined as 'vsize %lu Virtual memory size in bytes' 76 77 try (FileReader fileReader = new FileReader("/proc/self/stat"); 78 BufferedReader bufferedReader = new BufferedReader(fileReader)) { 79 String line = bufferedReader.readLine(); 80 return Long.parseLong(line.split(" ")[22]) / 1024; 81 } catch (Exception ex) {} 82 return 0; 83 } 84 }