107 lines
3.9 KiB
Java
107 lines
3.9 KiB
Java
/*
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* Copyright 2007-2008 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/* @test
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* @bug 6606598
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* @summary Unit test for java.nio.BufferPoolMXBean
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*/
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import java.nio.ByteBuffer;
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import java.nio.MappedByteBuffer;
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import java.nio.BufferPoolMXBean;
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import java.nio.channels.FileChannel;
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import java.io.File;
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import java.io.RandomAccessFile;
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import java.lang.management.ManagementFactory;
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import javax.management.MBeanServer;
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import javax.management.ObjectName;
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import java.util.*;
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public class Basic {
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// static fields to ensure buffers aren't GC'ed
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static List<ByteBuffer> buffers;
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static MappedByteBuffer mbb;
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// check counters
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static void check(List<BufferPoolMXBean> pools,
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int minBufferCount,
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long minTotalCapacity)
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{
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int bufferCount = 0;
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long totalCap = 0;
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long totalMem = 0;
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for (BufferPoolMXBean pool: pools) {
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bufferCount += pool.getCount();
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totalCap += pool.getTotalCapacity();
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totalMem += pool.getMemoryUsed();
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}
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if (bufferCount < minBufferCount)
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throw new RuntimeException("Count less than expected");
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if (totalMem < minTotalCapacity)
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throw new RuntimeException("Memory usage less than expected");
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if (totalCap < minTotalCapacity)
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throw new RuntimeException("Total capacity less than expected");
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}
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public static void main(String[] args) throws Exception {
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Random rand = new Random();
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// allocate a few direct buffers
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int bufferCount = 5 + rand.nextInt(20);
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buffers = new ArrayList<ByteBuffer>(bufferCount);
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long totalCapacity = 0L;
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for (int i=0; i<bufferCount; i++) {
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int cap = 1024 + rand.nextInt(4096);
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buffers.add( ByteBuffer.allocateDirect(cap) );
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totalCapacity += cap;
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}
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// map a file
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File f = File.createTempFile("blah", null);
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f.deleteOnExit();
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RandomAccessFile raf = new RandomAccessFile(f, "rw");
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FileChannel fc = raf.getChannel();
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mbb = fc.map(FileChannel.MapMode.READ_WRITE, 10, 100);
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bufferCount++;
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totalCapacity += mbb.capacity();
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// direct
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List<BufferPoolMXBean> pools =
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ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
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check(pools, bufferCount, totalCapacity);
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// using MBeanServer
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MBeanServer server = ManagementFactory.getPlatformMBeanServer();
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Set<ObjectName> mbeans = server.queryNames(
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new ObjectName("java.nio:type=BufferPool,*"), null);
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pools = new ArrayList<BufferPoolMXBean>();
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for (ObjectName name: mbeans) {
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BufferPoolMXBean pool = ManagementFactory
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.newPlatformMXBeanProxy(server, name.toString(), BufferPoolMXBean.class);
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pools.add(pool);
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}
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check(pools, bufferCount, totalCapacity);
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}
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}
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