J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2004 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 4530538 |
| 27 | * @summary Basic unit test of ClassLoadingMXBean.getLoadedClassCount() |
| 28 | * ClassLoadingMXBean.getTotalLoadedClassCount() |
| 29 | * ClassLoadingMXBean.getUnloadedClassCount() |
| 30 | * @author Alexei Guibadoulline |
| 31 | */ |
| 32 | |
| 33 | import java.lang.management.*; |
| 34 | import java.util.*; |
| 35 | |
| 36 | public class LoadCounts { |
| 37 | private static ClassLoadingMXBean mbean |
| 38 | = ManagementFactory.getClassLoadingMXBean(); |
| 39 | |
| 40 | public static void main(String argv[]) throws Exception { |
| 41 | // Get current count |
| 42 | int classesNowPrev = mbean.getLoadedClassCount(); |
| 43 | long classesTotalPrev = mbean.getTotalLoadedClassCount(); |
| 44 | |
| 45 | System.out.println("Loading 4 classes with the system class loader"); |
| 46 | |
| 47 | new SimpleOne(); |
| 48 | new SimpleTwo(); |
| 49 | new Chain(); |
| 50 | |
| 51 | int classesNow = mbean.getLoadedClassCount(); |
| 52 | long classesTotal = mbean.getTotalLoadedClassCount(); |
| 53 | |
| 54 | if (classesNow > classesTotal) |
| 55 | throw new RuntimeException("getLoadedClassCount() > " |
| 56 | + "getTotalLoadedClassCount()"); |
| 57 | |
| 58 | if (classesNowPrev + 4 != classesNow) |
| 59 | throw new RuntimeException("Number of loaded classes is " |
| 60 | + (classesNowPrev + 4) + ", but " |
| 61 | + "MBean.getLoadedClassCount() returned " |
| 62 | + classesNow); |
| 63 | if (classesTotalPrev + 4 != classesTotal) |
| 64 | throw new RuntimeException("Total number of loaded classes is " |
| 65 | + (classesTotalPrev + 4) + ", but " |
| 66 | + "MBean.getTotalLoadedClassCount() " |
| 67 | + "returned " + classesTotal); |
| 68 | |
| 69 | System.out.println("Creating new class loader instances"); |
| 70 | |
| 71 | LeftHand leftHand = new LeftHand(); |
| 72 | RightHand rightHand = new RightHand(); |
| 73 | LoaderForTwoInstances ins1 = new LoaderForTwoInstances(); |
| 74 | LoaderForTwoInstances ins2 = new LoaderForTwoInstances(); |
| 75 | |
| 76 | // Load different type of classes with different |
| 77 | // initiating classloaders but the same defining class loader. |
| 78 | System.out.println("Loading 2 class instances; each by " + |
| 79 | "2 initiating class loaders."); |
| 80 | |
| 81 | classesNowPrev = mbean.getLoadedClassCount(); |
| 82 | classesTotalPrev = mbean.getTotalLoadedClassCount(); |
| 83 | try { |
| 84 | Class.forName("Body", true, leftHand); |
| 85 | Class.forName("Body", true, rightHand); |
| 86 | Class.forName("TheSameClass", true, ins1); |
| 87 | Class.forName("TheSameClass", true, ins2); |
| 88 | } catch (ClassNotFoundException e) { |
| 89 | System.out.println("Unexpected excetion " + e); |
| 90 | e.printStackTrace(System.out); |
| 91 | throw new RuntimeException(); |
| 92 | } |
| 93 | classesNow = mbean.getLoadedClassCount(); |
| 94 | classesTotal = mbean.getTotalLoadedClassCount(); |
| 95 | |
| 96 | // Expected 2 classes got loaded since they are loaded by |
| 97 | // same defining class loader |
| 98 | if (classesNowPrev + 2 != classesNow) |
| 99 | throw new RuntimeException("Expected Number of loaded classes is " |
| 100 | + (classesNowPrev + 4) + ", but " |
| 101 | + "MBean.getLoadedClassCount() returned " |
| 102 | + classesNow); |
| 103 | if (classesTotalPrev + 2 != classesTotal) |
| 104 | throw new RuntimeException("Total number of loaded classes is " |
| 105 | + (classesTotalPrev + 4) + ", but " |
| 106 | + "MBean.getTotalLoadedClassCount() " |
| 107 | + "returned " + classesTotal); |
| 108 | |
| 109 | System.out.println("Test passed."); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | class SimpleOne {} |
| 114 | class SimpleTwo {} |
| 115 | |
| 116 | class Chain { |
| 117 | Slave slave = new Slave(); |
| 118 | } |
| 119 | class Slave {} |
| 120 | |
| 121 | class LeftHand extends ClassLoader {} |
| 122 | class RightHand extends ClassLoader {} |
| 123 | class Body {} |
| 124 | |
| 125 | class LoaderForTwoInstances extends ClassLoader {} |
| 126 | class TheSameClass {} |