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.getClassLoadingTime() 28 * @author Steve Bohne 29 * @modules java.management/sun.management 30 * @build ClassToLoad0 31 * @run main/othervm -XX:+UsePerfData GetClassLoadingTime 32 */ 33 34 /* 35 * This test is just a sanity check and does not check for the correct value. 36 */ 37 38 import java.io.*; 39 import sun.management.*; 40 41 public class GetClassLoadingTime { 42 43 private static HotspotClassLoadingMBean mbean = 44 (HotspotClassLoadingMBean)ManagementFactoryHelper.getHotspotClassLoadingMBean(); 45 46 // Careful with these values. 47 private static final long MIN_TIME_FOR_PASS = 1; 48 private static final long MAX_TIME_FOR_PASS = Long.MAX_VALUE; 49 50 private static boolean trace = false; 51 52 public static void main(String args[]) throws Exception { 53 if (args.length > 0 && args[0].equals("trace")) { 54 trace = true; 55 } 56 57 long time = mbean.getClassLoadingTime(); 58 59 if (trace) { 60 System.out.println("Class loading time (ms): " + time); 61 } 62 63 if (time < MIN_TIME_FOR_PASS || time > MAX_TIME_FOR_PASS) { 64 throw new RuntimeException("Class loading time " + 65 "illegal value: " + time + " ms " + 66 "(MIN = " + MIN_TIME_FOR_PASS + "; " + 67 "MAX = " + MAX_TIME_FOR_PASS + ")"); 68 } 69 70 // Load some classes to increase the time 71 for (int i = 0; i < 1000; i++) { 72 Class.forName("ClassToLoad0", true, new KlassLoader()); 73 } 74 75 long time2 = mbean.getClassLoadingTime(); 76 77 if (trace) { 78 System.out.println("Class loading time2 (ms): " + time2); 79 } 80 81 if (time2 <= time) { 82 throw new RuntimeException("Class loading time " + 83 "did not increase when class loaded" + 84 "(time = " + time + "; " + 85 "time2 = " + time2 + ")"); 86 } 87 88 System.out.println("Test passed."); 89 } 90 } 91 92 // KlassLoader exists to load classes without a parent classloader, 93 // so we can avoid delegation and spend lots of time loading the 94 // same class over and over, to test the class loading timer. 95 class KlassLoader extends ClassLoader { 96 97 public KlassLoader() { 98 super(null); 99 } 100 101 protected synchronized Class findClass(String name) 102 throws ClassNotFoundException { 103 String cname = 104 name.replace('.', '/') 105 +".class"; 106 107 FileInputStream in; 108 try { 109 in = new FileInputStream(new File(System.getProperty("test.classes", "."), cname)); 110 if (in == null) { 111 throw new ClassNotFoundException("getResourceAsStream(" 112 +cname+")"); 113 } 114 } catch(java.io.FileNotFoundException e ) { 115 throw new ClassNotFoundException("getResourceAsStream(" 116 +cname+") : " 117 +e); 118 } 119 120 int len; 121 byte data[]; 122 try { 123 len = in.available(); 124 data = new byte[len]; 125 for (int total = 0; total < data.length; ) { 126 total += in.read(data, total, data.length - total); 127 } 128 } catch (IOException e) { 129 throw new ClassNotFoundException(cname, e); 130 } finally { 131 try { 132 in.close(); 133 } catch (IOException e) { 134 } 135 } 136 137 return defineClass(name, data, 0, data.length); 138 } 139 }