/* * 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;
publicclass ThreadId { // Atomic integer containing the next thread ID to be assigned privatestaticfinal AtomicInteger nextId = new AtomicInteger(0);
// Thread local variable containing each thread's ID privatestaticfinal ThreadLocal<Integer> threadId = new ThreadLocal<Integer>() {
@Override protected Integer initialValue() { return nextId.getAndIncrement();
}
};
// Returns the current thread's unique ID, assigning it if necessary publicstaticint get() { return threadId.get();
}
}
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