forked from jboss-logging/jboss-logmanager
/
ContextClassLoaderLogContextSelector.java
107 lines (94 loc) · 4.29 KB
/
ContextClassLoaderLogContextSelector.java
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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
/*
* JBoss, Home of Professional Open Source.
*
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.logmanager;
import java.security.Permission;
import java.security.PrivilegedAction;
import java.util.concurrent.ConcurrentMap;
import static java.lang.System.getSecurityManager;
import static java.lang.Thread.currentThread;
import static java.security.AccessController.doPrivileged;
/**
* A log context selector which chooses a log context based on the thread context classloader.
*/
public final class ContextClassLoaderLogContextSelector implements LogContextSelector {
private static final Permission REGISTER_LOG_CONTEXT_PERMISSION = new RuntimePermission("registerLogContext", null);
private static final Permission UNREGISTER_LOG_CONTEXT_PERMISSION = new RuntimePermission("unregisterLogContext", null);
/**
* Construct a new instance. If no matching log context is found, the provided default selector is consulted.
*
* @param defaultSelector the selector to consult if no matching log context is found
*/
public ContextClassLoaderLogContextSelector(final LogContextSelector defaultSelector) {
this.defaultSelector = defaultSelector;
}
/**
* Construct a new instance. If no matching log context is found, the system context is used.
*/
public ContextClassLoaderLogContextSelector() {
this(LogContext.DEFAULT_LOG_CONTEXT_SELECTOR);
}
private final LogContextSelector defaultSelector;
private final ConcurrentMap<ClassLoader, LogContext> contextMap = new CopyOnWriteMap<ClassLoader, LogContext>();
private final PrivilegedAction<LogContext> logContextAction = new PrivilegedAction<LogContext>() {
public LogContext run() {
ClassLoader cl = currentThread().getContextClassLoader();
if (cl != null) {
final LogContext mappedContext = contextMap.get(cl);
if (mappedContext != null) {
return mappedContext;
}
}
return defaultSelector.getLogContext();
}
};
public LogContext getLogContext() {
return System.getSecurityManager() == null? logContextAction.run() :
doPrivileged(logContextAction);
}
/**
* Register a class loader with a log context. This method requires the {@code registerLogContext} {@link RuntimePermission}.
*
* @param classLoader the classloader
* @param logContext the log context
* @throws IllegalArgumentException if the classloader is already associated with a log context
*/
public void registerLogContext(ClassLoader classLoader, LogContext logContext) throws IllegalArgumentException {
final SecurityManager sm = getSecurityManager();
if (sm != null) {
sm.checkPermission(REGISTER_LOG_CONTEXT_PERMISSION);
}
if (contextMap.putIfAbsent(classLoader, logContext) != null) {
throw new IllegalArgumentException("ClassLoader instance is already registered to a log context (" + classLoader + ")");
}
}
/**
* Unregister a class loader/log context association. This method requires the {@code unregisterLogContext} {@link RuntimePermission}.
*
* @param classLoader the classloader
* @param logContext the log context
* @return {@code true} if the association exists and was removed, {@code false} otherwise
*/
public boolean unregisterLogContext(ClassLoader classLoader, LogContext logContext) {
final SecurityManager sm = getSecurityManager();
if (sm != null) {
sm.checkPermission(UNREGISTER_LOG_CONTEXT_PERMISSION);
}
return contextMap.remove(classLoader, logContext);
}
}