120 lines
4.3 KiB
Java
120 lines
4.3 KiB
Java
/*
|
|
* Copyright (c) 2007, 2016, 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 6606598 7024172
|
|
* @summary Unit test for java.lang.management.BufferPoolMXBean
|
|
* @modules jdk.management
|
|
* @run main/othervm Basic
|
|
* @key randomness
|
|
*/
|
|
|
|
import java.nio.ByteBuffer;
|
|
import java.nio.MappedByteBuffer;
|
|
import java.nio.file.Path;
|
|
import java.nio.file.Files;
|
|
import static java.nio.file.StandardOpenOption.*;
|
|
import java.nio.channels.FileChannel;
|
|
import java.lang.management.BufferPoolMXBean;
|
|
import java.lang.management.ManagementFactory;
|
|
import javax.management.MBeanServer;
|
|
import javax.management.ObjectName;
|
|
import java.lang.ref.WeakReference;
|
|
import java.util.*;
|
|
|
|
public class Basic {
|
|
|
|
// static fields to ensure buffers aren't GC'ed
|
|
static List<ByteBuffer> buffers;
|
|
static MappedByteBuffer mbb;
|
|
|
|
// check counters
|
|
static void check(List<BufferPoolMXBean> pools,
|
|
int minBufferCount,
|
|
long minTotalCapacity)
|
|
{
|
|
int bufferCount = 0;
|
|
long totalCap = 0;
|
|
long totalMem = 0;
|
|
for (BufferPoolMXBean pool: pools) {
|
|
bufferCount += pool.getCount();
|
|
totalCap += pool.getTotalCapacity();
|
|
totalMem += pool.getMemoryUsed();
|
|
}
|
|
if (bufferCount < minBufferCount)
|
|
throw new RuntimeException("Count less than expected");
|
|
if (totalMem < minTotalCapacity)
|
|
throw new RuntimeException("Memory usage less than expected");
|
|
if (totalCap < minTotalCapacity)
|
|
throw new RuntimeException("Total capacity less than expected");
|
|
}
|
|
|
|
public static void main(String[] args) throws Exception {
|
|
Random rand = new Random();
|
|
|
|
// allocate a few direct buffers
|
|
int bufferCount = 5 + rand.nextInt(20);
|
|
buffers = new ArrayList<ByteBuffer>(bufferCount);
|
|
long totalCapacity = 0L;
|
|
for (int i=0; i<bufferCount; i++) {
|
|
int cap = 1024 + rand.nextInt(4096);
|
|
buffers.add( ByteBuffer.allocateDirect(cap) );
|
|
totalCapacity += cap;
|
|
}
|
|
|
|
// create a mapped buffer
|
|
Path tmpfile = Files.createTempFile("blah", null);
|
|
tmpfile.toFile().deleteOnExit();
|
|
try (FileChannel fc = FileChannel.open(tmpfile, READ, WRITE)) {
|
|
mbb = fc.map(FileChannel.MapMode.READ_WRITE, 10, 100);
|
|
bufferCount++;
|
|
totalCapacity += mbb.capacity();
|
|
}
|
|
|
|
// use platform MXBeans directly
|
|
List<BufferPoolMXBean> pools =
|
|
ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
|
|
check(pools, bufferCount, totalCapacity);
|
|
|
|
// use MBeanServer
|
|
MBeanServer server = ManagementFactory.getPlatformMBeanServer();
|
|
Set<ObjectName> mbeans = server.queryNames(
|
|
new ObjectName("java.nio:type=BufferPool,*"), null);
|
|
pools = new ArrayList<BufferPoolMXBean>();
|
|
for (ObjectName name: mbeans) {
|
|
BufferPoolMXBean pool = ManagementFactory
|
|
.newPlatformMXBeanProxy(server, name.toString(), BufferPoolMXBean.class);
|
|
pools.add(pool);
|
|
}
|
|
check(pools, bufferCount, totalCapacity);
|
|
|
|
// attempt to unmap mapped buffer
|
|
WeakReference<MappedByteBuffer> ref = new WeakReference<>(mbb);
|
|
mbb = null;
|
|
do {
|
|
System.gc();
|
|
Thread.sleep(250);
|
|
} while (ref.get() != null);
|
|
}
|
|
}
|