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| 1 | /* | ||
| 2 | * Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved. | ||
| 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 | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 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 | * | ||
| 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. | ||
| 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 | } | ||