| /* |
| * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * |
| * |
| * Example class from java.lang.ThreadLocal class doc. Used by |
| * TestThreadId.java |
| */ |
| |
| // Josh Bloch suggested this latest version after many inputs from other |
| // EG members and JUC list subscribers |
| |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| public class ThreadId { |
| // Atomic integer containing the next thread ID to be assigned |
| private static final AtomicInteger nextId = new AtomicInteger(0); |
| |
| // Thread local variable containing each thread's ID |
| private static final ThreadLocal<Integer> threadId = |
| new ThreadLocal<Integer>() { |
| @Override protected Integer initialValue() { |
| return nextId.getAndIncrement(); |
| } |
| }; |
| |
| // Returns the current thread's unique ID, assigning it if necessary |
| public static int get() { |
| return threadId.get(); |
| } |
| } |