1 /* 2 * Copyright (c) 2003, 2015, 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 /* 25 * @test 26 * @bug 4858522 27 * @summary Basic unit test of HotspotClassLoadingMBean.getClassInitializationTime() 28 * @author Steve Bohne 29 * @modules java.management/sun.management 30 * @run main/othervm -XX:+UsePerfData GetClassInitializationTime 31 */ 32 33 /* 34 * This test is just a sanity check and does not check for the correct value. 35 */ 36 37 import sun.management.*; 38 39 public class GetClassInitializationTime { 40 41 private static HotspotClassLoadingMBean mbean = 42 (HotspotClassLoadingMBean)ManagementFactoryHelper.getHotspotClassLoadingMBean(); 43 44 // Careful with these values. 45 private static final long MIN_TIME_FOR_PASS = 1; 46 private static final long MAX_TIME_FOR_PASS = Long.MAX_VALUE; 47 48 private static boolean trace = false; 49 50 public static void main(String args[]) throws Exception { 51 if (args.length > 0 && args[0].equals("trace")) { 52 trace = true; 53 } 54 55 long time = mbean.getClassInitializationTime(); 56 57 if (trace) { 58 System.out.println("Class initialization time (ms): " + time); 59 } 60 61 if (time < MIN_TIME_FOR_PASS || time > MAX_TIME_FOR_PASS) { 62 throw new RuntimeException("Class initialization time " + 63 "illegal value: " + time + " ms " + 64 "(MIN = " + MIN_TIME_FOR_PASS + "; " + 65 "MAX = " + MAX_TIME_FOR_PASS + ")"); 66 } 67 68 // Load a class and make sure the time increases 69 Class.forName("ClassToInitialize"); 70 71 long time2 = mbean.getClassInitializationTime(); 72 73 if (trace) { 74 System.out.println("Class initialization time2 (ms): " + time2); 75 } 76 77 if (time2 <= time) { 78 throw new RuntimeException("Class initialization time " + 79 "did not increase when class loaded " + 80 "(time = " + time + "; " + 81 "time2 = " + time2 + ")"); 82 } 83 84 System.out.println("Test passed."); 85 } 86 } 87 88 // This class should just cause the initialization timer to run 89 class ClassToInitialize { 90 static { 91 try { 92 Thread.sleep(1000); 93 } catch (InterruptedException ie) { 94 // do nothing 95 } 96 } 97 }