| /* |
| * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 4530538 |
| * @summary Basic unit test of ClassLoadingMXBean.getLoadedClassCount() |
| * ClassLoadingMXBean.getTotalLoadedClassCount() |
| * ClassLoadingMXBean.getUnloadedClassCount() |
| * @author Alexei Guibadoulline |
| * |
| * @run main/othervm LoadCounts |
| */ |
| |
| import java.lang.management.*; |
| |
| public class LoadCounts { |
| private static ClassLoadingMXBean mbean |
| = ManagementFactory.getClassLoadingMXBean(); |
| |
| public static void main(String argv[]) throws Exception { |
| // Get current count |
| int classesNowPrev = mbean.getLoadedClassCount(); |
| long classesTotalPrev = mbean.getTotalLoadedClassCount(); |
| |
| System.out.println("Loading 4 classes with the system class loader"); |
| |
| new SimpleOne(); |
| new SimpleTwo(); |
| new Chain(); |
| |
| int classesNow = mbean.getLoadedClassCount(); |
| long classesTotal = mbean.getTotalLoadedClassCount(); |
| |
| if (classesNow > classesTotal) |
| throw new RuntimeException("getLoadedClassCount() > " |
| + "getTotalLoadedClassCount()"); |
| |
| if (classesNowPrev + 4 > classesNow) |
| throw new RuntimeException("Number of loaded classes is " |
| + "expected to be at least " |
| + (classesNowPrev + 4) + ", but " |
| + "MBean.getLoadedClassCount() returned " |
| + classesNow); |
| if (classesTotalPrev + 4 > classesTotal) |
| throw new RuntimeException("Total number of loaded classes is " |
| + "expected to be at least " |
| + (classesTotalPrev + 4) + ", but " |
| + "MBean.getTotalLoadedClassCount() " |
| + "returned " + classesTotal); |
| |
| System.out.println("Creating new class loader instances"); |
| |
| LeftHand leftHand = new LeftHand(); |
| RightHand rightHand = new RightHand(); |
| LoaderForTwoInstances ins1 = new LoaderForTwoInstances(); |
| LoaderForTwoInstances ins2 = new LoaderForTwoInstances(); |
| |
| // Load different type of classes with different |
| // initiating classloaders but the same defining class loader. |
| System.out.println("Loading 2 class instances; each by " + |
| "2 initiating class loaders."); |
| |
| classesNowPrev = mbean.getLoadedClassCount(); |
| classesTotalPrev = mbean.getTotalLoadedClassCount(); |
| try { |
| Class.forName("Body", true, leftHand); |
| Class.forName("Body", true, rightHand); |
| Class.forName("TheSameClass", true, ins1); |
| Class.forName("TheSameClass", true, ins2); |
| } catch (ClassNotFoundException e) { |
| System.out.println("Unexpected excetion " + e); |
| e.printStackTrace(System.out); |
| throw new RuntimeException(); |
| } |
| classesNow = mbean.getLoadedClassCount(); |
| classesTotal = mbean.getTotalLoadedClassCount(); |
| |
| // Expected 2 classes got loaded since they are loaded by |
| // same defining class loader |
| if (classesNowPrev + 2 > classesNow) |
| throw new RuntimeException("Number of loaded classes is " |
| + "expected to be at least " |
| + (classesNowPrev + 4) + ", but " |
| + "MBean.getLoadedClassCount() returned " |
| + classesNow); |
| if (classesTotalPrev + 2 > classesTotal) |
| throw new RuntimeException("Total number of loaded classes is " |
| + "expected to be at least " |
| + (classesTotalPrev + 4) + ", but " |
| + "MBean.getTotalLoadedClassCount() " |
| + "returned " + classesTotal); |
| |
| System.out.println("Test passed."); |
| } |
| } |
| |
| class SimpleOne {} |
| class SimpleTwo {} |
| |
| class Chain { |
| Slave slave = new Slave(); |
| } |
| class Slave {} |
| |
| class LeftHand extends ClassLoader { |
| public LeftHand() { |
| super(LeftHand.class.getClassLoader()); |
| } |
| } |
| class RightHand extends ClassLoader { |
| public RightHand() { |
| super(RightHand.class.getClassLoader()); |
| } |
| } |
| class Body {} |
| |
| class LoaderForTwoInstances extends ClassLoader { |
| public LoaderForTwoInstances() { |
| super(LoaderForTwoInstances.class.getClassLoader()); |
| } |
| } |
| class TheSameClass {} |