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();
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 }
|
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 7024172
26 * @summary Unit test for java.lang.management.BufferPoolMXBean
27 * @run main/othervm Basic
28 */
29
30 import java.nio.ByteBuffer;
31 import java.nio.MappedByteBuffer;
32 import java.nio.file.Path;
33 import java.nio.file.Files;
34 import static java.nio.file.StandardOpenOption.*;
35 import java.nio.channels.FileChannel;
36 import java.lang.management.BufferPoolMXBean;
37 import java.lang.management.ManagementFactory;
38 import javax.management.MBeanServer;
39 import javax.management.ObjectName;
40 import java.lang.ref.WeakReference;
41 import java.util.*;
42
43 public class Basic {
44
45 // static fields to ensure buffers aren't GC'ed
46 static List<ByteBuffer> buffers;
47 static MappedByteBuffer mbb;
48
49 // check counters
50 static void check(List<BufferPoolMXBean> pools,
51 int minBufferCount,
52 long minTotalCapacity)
53 {
54 int bufferCount = 0;
55 long totalCap = 0;
56 long totalMem = 0;
57 for (BufferPoolMXBean pool: pools) {
58 bufferCount += pool.getCount();
59 totalCap += pool.getTotalCapacity();
60 totalMem += pool.getMemoryUsed();
63 throw new RuntimeException("Count less than expected");
64 if (totalMem < minTotalCapacity)
65 throw new RuntimeException("Memory usage less than expected");
66 if (totalCap < minTotalCapacity)
67 throw new RuntimeException("Total capacity less than expected");
68 }
69
70 public static void main(String[] args) throws Exception {
71 Random rand = new Random();
72
73 // allocate a few direct buffers
74 int bufferCount = 5 + rand.nextInt(20);
75 buffers = new ArrayList<ByteBuffer>(bufferCount);
76 long totalCapacity = 0L;
77 for (int i=0; i<bufferCount; i++) {
78 int cap = 1024 + rand.nextInt(4096);
79 buffers.add( ByteBuffer.allocateDirect(cap) );
80 totalCapacity += cap;
81 }
82
83 // create a mapped buffer
84 Path tmpfile = Files.createTempFile("blah", null);
85 tmpfile.toFile().deleteOnExit();
86 try (FileChannel fc = FileChannel.open(tmpfile, READ, WRITE)) {
87 mbb = fc.map(FileChannel.MapMode.READ_WRITE, 10, 100);
88 bufferCount++;
89 totalCapacity += mbb.capacity();
90 }
91
92 // use platform MXBeans directly
93 List<BufferPoolMXBean> pools =
94 ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
95 check(pools, bufferCount, totalCapacity);
96
97 // use MBeanServer
98 MBeanServer server = ManagementFactory.getPlatformMBeanServer();
99 Set<ObjectName> mbeans = server.queryNames(
100 new ObjectName("java.nio:type=BufferPool,*"), null);
101 pools = new ArrayList<BufferPoolMXBean>();
102 for (ObjectName name: mbeans) {
103 BufferPoolMXBean pool = ManagementFactory
104 .newPlatformMXBeanProxy(server, name.toString(), BufferPoolMXBean.class);
105 pools.add(pool);
106 }
107 check(pools, bufferCount, totalCapacity);
108
109 // attempt to unmap mapped buffer
110 WeakReference<MappedByteBuffer> ref = new WeakReference<>(mbb);
111 mbb = null;
112 do {
113 System.gc();
114 Thread.sleep(250);
115 } while (ref.get() != null);
116 }
117 }
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