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Java example source code file (ITLRemoveTest.java)

This example Java source code file (ITLRemoveTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

inheritablethreadlocal, initial_value, integer, interrupted, itlremovetest, mythread, remove_set_value, runtimeexception, thread, throwable

The ITLRemoveTest.java Java example source code

/*
 * Copyright (c) 2004, 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.
 */

/*
 * @test
 * @summary Basic functional test of remove method for InheritableThreadLocal
 * @author Seetharama Avadhanam
 */

public class ITLRemoveTest {
    private static final int INITIAL_VALUE = Integer.MIN_VALUE;
    private static final int REMOVE_SET_VALUE = Integer.MAX_VALUE;

    static InheritableThreadLocal<Integer> n = new InheritableThreadLocal() {
        protected Integer initialValue() {
            return INITIAL_VALUE;
        }

        protected Integer childValue(Integer parentValue) {
            return(parentValue + 1);
        }
    };

    static int threadCount = 100;
    static int x[];
    static Throwable exceptions[];
    static final int[] removeNode = {10,20,45,38,88};
    /* ThreadLocal values will be removed for these threads. */
    static final int[] removeAndSet = {12,34,10};
    /* ThreadLocal values will be removed and sets new values */

    public static void main(String args[]) throws Throwable {
        x = new int[threadCount];
        exceptions = new Throwable[threadCount];

        Thread progenitor = new MyThread();
        progenitor.start();

        // Wait for *all* threads to complete
        progenitor.join();

        for(int i = 0; i<threadCount; i++){
            int checkValue = i+INITIAL_VALUE;

            /* If the remove method is called then the ThreadLocal value will
             * be its initial value */
            for(int removeId : removeNode)
                if(removeId == i){
                    checkValue = INITIAL_VALUE;
                    break;
                }

            for(int removeId : removeAndSet)
                if(removeId == i){
                    checkValue = REMOVE_SET_VALUE;
                    break;
                }

            if(exceptions[i] != null)
                throw(exceptions[i]);
            if(x[i] != checkValue)
                throw(new Throwable("x[" + i + "] =" + x[i]));
        }
    }
    private static class MyThread extends Thread {
        public void run() {

            Thread child = null;
            int threadId=0;
            try{
                threadId = n.get();
                // Creating child thread...
                if (threadId < (threadCount-1+INITIAL_VALUE)) {
                    child = new MyThread();
                    child.start();
                }

                for (int j = 0; j<threadId; j++)
                    Thread.currentThread().yield();


                // To remove the ThreadLocal value...
                for(int removeId  : removeNode)
                   if((threadId-INITIAL_VALUE) == removeId){
                       n.remove();
                       break;
                   }

                 // To remove the ThreadLocal value and set new value ...
                 for(int removeId  : removeAndSet)
                    if((threadId-INITIAL_VALUE) == removeId){
                        n.remove();
                        n.set(REMOVE_SET_VALUE);
                        break;
                    }
                x[threadId-INITIAL_VALUE] =  n.get();
            }catch(Throwable ex){
                exceptions[threadId-INITIAL_VALUE] = ex;
            }
             // Wait for child (if any)
            if (child != null) {
                try {
                     child.join();
                } catch(InterruptedException e) {
                     throw(new RuntimeException("Interrupted"));
                }
            }
        }
    }
}

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