144 lines
5.5 KiB
Java
144 lines
5.5 KiB
Java
/*
|
|
* Copyright (c) 2003, 2020, 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 {
|
|
Worker worker = new Worker();
|
|
}
|
|
class Worker {}
|
|
|
|
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 {}
|