1/* 2 * Copyright (c) 2008, 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 24import java.lang.instrument.Instrumentation; 25 26public class StressGetObjectSizeApp 27 extends ASimpleInstrumentationTestCase 28{ 29 30 /** 31 * Constructor for StressGetObjectSizeApp. 32 * @param name 33 */ 34 public StressGetObjectSizeApp(String name) 35 { 36 super(name); 37 } 38 39 public static void 40 main (String[] args) 41 throws Throwable { 42 ATestCaseScaffold test = new StressGetObjectSizeApp(args[0]); 43 test.runTest(); 44 } 45 46 protected final void 47 doRunTest() 48 throws Throwable { 49 stressGetObjectSize(); 50 } 51 52 public void stressGetObjectSize() { 53 System.out.println("main: an object size=" + 54 fInst.getObjectSize(new Object())); 55 56 RoundAndRound[] threads = new RoundAndRound[10]; 57 for (int i = 0; i < threads.length; ++i) { 58 threads[i] = new RoundAndRound(fInst); 59 threads[i].start(); 60 } 61 try { 62 Thread.sleep(500); // let all threads get going in their loops 63 } catch (InterruptedException ie) { 64 } 65 System.out.println("stressGetObjectSize: returning"); 66 return; 67 } 68 69 private static class RoundAndRound extends Thread { 70 private final Instrumentation inst; 71 private final Object anObject; 72 73 public RoundAndRound(Instrumentation inst) { 74 this.inst = inst; 75 this.anObject = new Object(); 76 setDaemon(true); 77 } 78 79 public void run() { 80 long sum = 0; 81 while (true) { 82 sum += inst.getObjectSize(anObject); 83 } 84 } 85 } 86} 87