1 /* 2 * Copyright (c) 2003, 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 24 /* 25 * @test 26 * @bug 4858522 27 * @summary Basic unit test of HotspotClassLoadingMBean.getClassLoadingTime() 28 * @author Steve Bohne 29 * @build ClassToLoad0 30 */ 31 32 /* 33 * This test is just a sanity check and does not check for the correct value. 34 */ 35 36 import java.io.*; 37 import sun.management.*; 38 39 public class GetClassLoadingTime { 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.getClassLoadingTime(); 56 57 if (trace) { 58 System.out.println("Class loading time (ms): " + time); 59 } 60 61 if (time < MIN_TIME_FOR_PASS || time > MAX_TIME_FOR_PASS) { 62 throw new RuntimeException("Class loading time " + 63 "illegal value: " + time + " ms " + 64 "(MIN = " + MIN_TIME_FOR_PASS + "; " + 65 "MAX = " + MAX_TIME_FOR_PASS + ")"); 66 } 67 68 // Load some classes to increase the time 69 for (int i = 0; i < 1000; i++) { 70 Class.forName("ClassToLoad0", true, new KlassLoader()); 71 } 72 73 long time2 = mbean.getClassLoadingTime(); 74 long count = mbean.getLoadedClassCount(); 75 76 if (trace) { 77 System.out.println("(new count is " + count + ")"); 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 static String klassDir=""; 97 static int index=0; 98 99 public KlassLoader() { 100 super(null); 101 } 102 103 protected synchronized Class findClass(String name) 104 throws ClassNotFoundException { 105 String cname = klassDir 106 + (klassDir == "" ? "" : "/") 107 +name.replace('.', '/') 108 +".class"; 109 110 FileInputStream in; 111 try { 112 in=new FileInputStream(cname); 113 if (in == null) { 114 throw new ClassNotFoundException("getResourceAsStream(" 115 +cname+")"); 116 } 117 } catch(java.io.FileNotFoundException e ) { 118 throw new ClassNotFoundException("getResourceAsStream(" 119 +cname+") : " 120 +e); 121 } 122 123 int len; 124 byte data[]; 125 try { 126 len = in.available(); 127 data = new byte[len]; 128 for (int total = 0; total < data.length; ) { 129 total += in.read(data, total, data.length - total); 130 } 131 } catch (IOException e) { 132 throw new ClassNotFoundException(cname, e); 133 } finally { 134 try { 135 in.close(); 136 } catch (IOException e) { 137 } 138 } 139 140 return defineClass(name, data, 0, data.length); 141 } 142 }