1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
/*
* Copyright (c) 2008, 2015, 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 6610094
* @summary Test the OperatingSystemMXBean instance returned by
* ManagementFactory.getPlatformMXBeans()
* @author Mandy Chung
*
* @modules java.management
* jdk.management
* @run main PlatformMXBeanTest
*/
import java.lang.management.*;
import java.util.List;
public class PlatformMXBeanTest {
public static void main(String[] argv) throws Exception {
OperatingSystemMXBean osMBean = getOSPlatformMXBean(OperatingSystemMXBean.class);
// There should have only one single MXBean for the OS MXBean interfaces:
// java.lang.management.OperatingSystemMXBean
// com.sun.management.OperatingSystemMXBean
// com.sun.management.UnixOperatingSystemMXBean
if (osMBean != getOSPlatformMXBean(com.sun.management.OperatingSystemMXBean.class)) {
throw new RuntimeException(
"Invalid com.sun.management.OperatingSystemMXBean instance");
}
if (!System.getProperty("os.name").startsWith("Windows") &&
osMBean != getOSPlatformMXBean(com.sun.management.UnixOperatingSystemMXBean.class)) {
throw new RuntimeException(
"Invalid com.sun.management.UnixOperatingSystemMXBean instance");
}
}
private static <T extends OperatingSystemMXBean>
T getOSPlatformMXBean(Class<T> c) {
List<T> result = ManagementFactory.getPlatformMXBeans(c);
if (result.isEmpty()) {
return null;
} else if (result.size() == 1) {
return result.get(0);
} else {
throw new RuntimeException(c.getName() + " has " +
result.size() + " number of instances");
}
}
}
|
