1 /* 2 * Copyright (c) 2015, 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 com.sun.xml.internal.ws.api.pipe; 27 28 import java.lang.reflect.Constructor; 29 import java.security.AccessController; 30 import java.security.PrivilegedAction; 31 32 /** 33 * Simple utility class to instantiate correct Thread instance 34 * depending on runtime context (jdk/non-jdk usage) 35 * 36 * @author miroslav.kos@oracle.com 37 */ 38 final class ThreadHelper { 39 40 private static final String SAFE_THREAD_NAME = "sun.misc.ManagedLocalsThread"; 41 private static final Constructor THREAD_CONSTRUCTOR; 42 43 // no instantiating wanted 44 private ThreadHelper() { 45 } 46 47 static { 48 THREAD_CONSTRUCTOR = AccessController.doPrivileged( 49 new PrivilegedAction<Constructor> () { 50 @Override 51 public Constructor run() { 52 try { 53 Class cls = Class.forName(SAFE_THREAD_NAME); 54 if (cls != null) { 55 return cls.getConstructor(Runnable.class); 56 } 57 } catch (ClassNotFoundException ignored) { 58 } catch (NoSuchMethodException ignored) { 59 } 60 return null; 61 } 62 } 63 ); 64 } 65 66 static Thread createNewThread(final Runnable r) { 67 if (isJDKInternal()) { 68 return AccessController.doPrivileged( 69 new PrivilegedAction<Thread>() { 70 @Override 71 public Thread run() { 72 try { 73 return (Thread) THREAD_CONSTRUCTOR.newInstance(r); 74 } catch (Exception e) { 75 return new Thread(r); 76 } 77 } 78 } 79 ); 80 } else { 81 return new Thread(r); 82 } 83 } 84 85 private static boolean isJDKInternal() { 86 String className = ThreadHelper.class.getName(); 87 return className.contains(".internal."); 88 } 89 }