1 /*
2 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /* @test
25 * @bug 6606598
26 * @summary Unit test for java.nio.BufferPoolMXBean
27 * @run main/othervm Basic
28 */
29
30 import java.nio.ByteBuffer;
31 import java.nio.MappedByteBuffer;
32 import java.nio.BufferPoolMXBean;
33 import java.nio.channels.FileChannel;
34 import java.io.File;
35 import java.io.RandomAccessFile;
36 import java.lang.management.ManagementFactory;
37 import javax.management.MBeanServer;
38 import javax.management.ObjectName;
39 import java.util.*;
40
41 public class Basic {
42
43 // static fields to ensure buffers aren't GC'ed
44 static List<ByteBuffer> buffers;
45 static MappedByteBuffer mbb;
46
47 // check counters
48 static void check(List<BufferPoolMXBean> pools,
49 int minBufferCount,
50 long minTotalCapacity)
51 {
52 int bufferCount = 0;
53 long totalCap = 0;
54 long totalMem = 0;
55 for (BufferPoolMXBean pool: pools) {
56 bufferCount += pool.getCount();
57 totalCap += pool.getTotalCapacity();
58 totalMem += pool.getMemoryUsed();
59 }
60 if (bufferCount < minBufferCount)
61 throw new RuntimeException("Count less than expected");
62 if (totalMem < minTotalCapacity)
63 throw new RuntimeException("Memory usage less than expected");
64 if (totalCap < minTotalCapacity)
65 throw new RuntimeException("Total capacity less than expected");
66 }
67
68 public static void main(String[] args) throws Exception {
69 Random rand = new Random();
70
71 // allocate a few direct buffers
72 int bufferCount = 5 + rand.nextInt(20);
73 buffers = new ArrayList<ByteBuffer>(bufferCount);
74 long totalCapacity = 0L;
75 for (int i=0; i<bufferCount; i++) {
76 int cap = 1024 + rand.nextInt(4096);
77 buffers.add( ByteBuffer.allocateDirect(cap) );
78 totalCapacity += cap;
79 }
80
81 // map a file
82 File f = File.createTempFile("blah", null);
83 f.deleteOnExit();
84 RandomAccessFile raf = new RandomAccessFile(f, "rw");
85 FileChannel fc = raf.getChannel();
86 mbb = fc.map(FileChannel.MapMode.READ_WRITE, 10, 100);
87 bufferCount++;
88 totalCapacity += mbb.capacity();
89
90 // direct
91 List<BufferPoolMXBean> pools =
92 ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
93 check(pools, bufferCount, totalCapacity);
94
95 // using MBeanServer
96 MBeanServer server = ManagementFactory.getPlatformMBeanServer();
97 Set<ObjectName> mbeans = server.queryNames(
98 new ObjectName("java.nio:type=BufferPool,*"), null);
99 pools = new ArrayList<BufferPoolMXBean>();
100 for (ObjectName name: mbeans) {
101 BufferPoolMXBean pool = ManagementFactory
102 .newPlatformMXBeanProxy(server, name.toString(), BufferPoolMXBean.class);
103 pools.add(pool);
104 }
105 check(pools, bufferCount, totalCapacity);
106 }
107 }