2
|
1 |
/*
|
5506
|
2 |
* Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved.
|
2
|
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
|
5506
|
7 |
* published by the Free Software Foundation. Oracle designates this
|
2
|
8 |
* particular file as subject to the "Classpath" exception as provided
|
5506
|
9 |
* by Oracle in the LICENSE file that accompanied this code.
|
2
|
10 |
*
|
|
11 |
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
12 |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
13 |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
14 |
* version 2 for more details (a copy is included in the LICENSE file that
|
|
15 |
* accompanied this code).
|
|
16 |
*
|
|
17 |
* You should have received a copy of the GNU General Public License version
|
|
18 |
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
19 |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
20 |
*
|
5506
|
21 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
22 |
* or visit www.oracle.com if you need additional information or have any
|
|
23 |
* questions.
|
2
|
24 |
*/
|
|
25 |
|
|
26 |
package sun.rmi.runtime;
|
|
27 |
|
|
28 |
import java.security.AccessController;
|
|
29 |
import java.security.PrivilegedAction;
|
|
30 |
import sun.security.util.SecurityConstants;
|
|
31 |
|
|
32 |
/**
|
|
33 |
* A PrivilegedAction for creating a new thread conveniently with an
|
|
34 |
* AccessController.doPrivileged construct.
|
|
35 |
*
|
|
36 |
* All constructors allow the choice of the Runnable for the new
|
|
37 |
* thread to execute, the name of the new thread (which will be
|
|
38 |
* prefixed with "RMI "), and whether or not it will be a daemon
|
|
39 |
* thread.
|
|
40 |
*
|
|
41 |
* The new thread may be created in the system thread group (the root
|
|
42 |
* of the thread group tree) or an internally created non-system
|
|
43 |
* thread group, as specified at construction of this class.
|
|
44 |
*
|
|
45 |
* The new thread will have the system class loader as its initial
|
|
46 |
* context class loader (that is, its context class loader will NOT be
|
|
47 |
* inherited from the current thread).
|
|
48 |
*
|
|
49 |
* @author Peter Jones
|
|
50 |
**/
|
|
51 |
public final class NewThreadAction implements PrivilegedAction<Thread> {
|
|
52 |
|
|
53 |
/** cached reference to the system (root) thread group */
|
|
54 |
static final ThreadGroup systemThreadGroup =
|
|
55 |
AccessController.doPrivileged(new PrivilegedAction<ThreadGroup>() {
|
|
56 |
public ThreadGroup run() {
|
|
57 |
ThreadGroup group = Thread.currentThread().getThreadGroup();
|
|
58 |
ThreadGroup parent;
|
|
59 |
while ((parent = group.getParent()) != null) {
|
|
60 |
group = parent;
|
|
61 |
}
|
|
62 |
return group;
|
|
63 |
}
|
|
64 |
});
|
|
65 |
|
|
66 |
/**
|
|
67 |
* special child of the system thread group for running tasks that
|
|
68 |
* may execute user code, so that the security policy for threads in
|
|
69 |
* the system thread group will not apply
|
|
70 |
*/
|
|
71 |
static final ThreadGroup userThreadGroup =
|
|
72 |
AccessController.doPrivileged(new PrivilegedAction<ThreadGroup>() {
|
|
73 |
public ThreadGroup run() {
|
|
74 |
return new ThreadGroup(systemThreadGroup, "RMI Runtime");
|
|
75 |
}
|
|
76 |
});
|
|
77 |
|
|
78 |
private final ThreadGroup group;
|
|
79 |
private final Runnable runnable;
|
|
80 |
private final String name;
|
|
81 |
private final boolean daemon;
|
|
82 |
|
|
83 |
NewThreadAction(ThreadGroup group, Runnable runnable,
|
|
84 |
String name, boolean daemon)
|
|
85 |
{
|
|
86 |
this.group = group;
|
|
87 |
this.runnable = runnable;
|
|
88 |
this.name = name;
|
|
89 |
this.daemon = daemon;
|
|
90 |
}
|
|
91 |
|
|
92 |
/**
|
|
93 |
* Creates an action that will create a new thread in the
|
|
94 |
* system thread group.
|
|
95 |
*
|
|
96 |
* @param runnable the Runnable for the new thread to execute
|
|
97 |
*
|
|
98 |
* @param name the name of the new thread
|
|
99 |
*
|
|
100 |
* @param daemon if true, new thread will be a daemon thread;
|
|
101 |
* if false, new thread will not be a daemon thread
|
|
102 |
*/
|
|
103 |
public NewThreadAction(Runnable runnable, String name, boolean daemon) {
|
|
104 |
this(systemThreadGroup, runnable, name, daemon);
|
|
105 |
}
|
|
106 |
|
|
107 |
/**
|
|
108 |
* Creates an action that will create a new thread.
|
|
109 |
*
|
|
110 |
* @param runnable the Runnable for the new thread to execute
|
|
111 |
*
|
|
112 |
* @param name the name of the new thread
|
|
113 |
*
|
|
114 |
* @param daemon if true, new thread will be a daemon thread;
|
|
115 |
* if false, new thread will not be a daemon thread
|
|
116 |
*
|
|
117 |
* @param user if true, thread will be created in a non-system
|
|
118 |
* thread group; if false, thread will be created in the system
|
|
119 |
* thread group
|
|
120 |
*/
|
|
121 |
public NewThreadAction(Runnable runnable, String name, boolean daemon,
|
|
122 |
boolean user)
|
|
123 |
{
|
|
124 |
this(user ? userThreadGroup : systemThreadGroup,
|
|
125 |
runnable, name, daemon);
|
|
126 |
}
|
|
127 |
|
|
128 |
public Thread run() {
|
|
129 |
SecurityManager sm = System.getSecurityManager();
|
|
130 |
if (sm != null) {
|
|
131 |
sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
|
|
132 |
}
|
|
133 |
Thread t = new Thread(group, runnable, "RMI " + name);
|
|
134 |
t.setContextClassLoader(ClassLoader.getSystemClassLoader());
|
|
135 |
t.setDaemon(daemon);
|
|
136 |
return t;
|
|
137 |
}
|
|
138 |
}
|