J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any 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)ManagementFactory.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 | } |