53 lines
1.8 KiB
Java
53 lines
1.8 KiB
Java
/*
|
|
* 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();
|
|
}
|
|
}
|