53 lines
1.8 KiB
Java
53 lines
1.8 KiB
Java
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/*
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* Copyright 2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/*
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*
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*
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* Example class from java.lang.ThreadLocal class doc. Used by
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* TestThreadId.java
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*/
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// Josh Bloch suggested this latest version after many inputs from other
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// EG members and JUC list subscribers
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import java.util.concurrent.atomic.AtomicInteger;
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public class ThreadId {
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// Atomic integer containing the next thread ID to be assigned
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private static final AtomicInteger nextId = new AtomicInteger(0);
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// Thread local variable containing each thread's ID
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private static final ThreadLocal<Integer> threadId =
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new ThreadLocal<Integer>() {
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@Override protected Integer initialValue() {
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return nextId.getAndIncrement();
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}
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};
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// Returns the current thread's unique ID, assigning it if necessary
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public static int get() {
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return threadId.get();
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}
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}
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