blob: 5be1447532e9b30da738035a6b3d55dcb545cf9d (
plain)
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
72
73
74
75
76
77
|
package org.junit.internal.management;
import org.junit.internal.Classes;
import java.lang.reflect.InvocationTargetException;
/**
* Reflective wrapper around {@link java.lang.management.ManagementFactory}
*/
public class ManagementFactory {
private static final class FactoryHolder {
private static final Class<?> MANAGEMENT_FACTORY_CLASS;
static {
Class<?> managementFactoryClass = null;
try {
managementFactoryClass = Classes.getClass("java.lang.management.ManagementFactory");
} catch (ClassNotFoundException e) {
// do nothing, managementFactoryClass will be none on failure
}
MANAGEMENT_FACTORY_CLASS = managementFactoryClass;
}
static Object getBeanObject(String methodName) {
if (MANAGEMENT_FACTORY_CLASS != null) {
try {
return MANAGEMENT_FACTORY_CLASS.getMethod(methodName).invoke(null);
} catch (IllegalAccessException e) {
// fallthrough
} catch (IllegalArgumentException e) {
// fallthrough
} catch (InvocationTargetException e) {
// fallthrough
} catch (NoSuchMethodException e) {
// fallthrough
} catch (SecurityException e) {
// fallthrough
}
}
return null;
}
}
private static final class RuntimeHolder {
private static final RuntimeMXBean RUNTIME_MX_BEAN =
getBean(FactoryHolder.getBeanObject("getRuntimeMXBean"));
private static final RuntimeMXBean getBean(Object runtimeMxBean) {
return runtimeMxBean != null
? new ReflectiveRuntimeMXBean(runtimeMxBean) : new FakeRuntimeMXBean();
}
}
private static final class ThreadHolder {
private static final ThreadMXBean THREAD_MX_BEAN =
getBean(FactoryHolder.getBeanObject("getThreadMXBean"));
private static final ThreadMXBean getBean(Object threadMxBean) {
return threadMxBean != null
? new ReflectiveThreadMXBean(threadMxBean) : new FakeThreadMXBean();
}
}
/**
* @see java.lang.management.ManagementFactory#getRuntimeMXBean()
*/
public static RuntimeMXBean getRuntimeMXBean() {
return RuntimeHolder.RUNTIME_MX_BEAN;
}
/**
* @see java.lang.management.ManagementFactory#getThreadMXBean()
*/
public static ThreadMXBean getThreadMXBean() {
return ThreadHolder.THREAD_MX_BEAN;
}
}
|