threadlocaltest.java

来自「SRI international 发布的OAA框架软件」· Java 代码 · 共 107 行

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/licenses/publicdomain
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.*;
import edu.emory.mathcs.backport.java.util.concurrent.Semaphore;

public class ThreadLocalTest extends JSR166TestCase {
    public static void main(String[] args) {
	junit.textui.TestRunner.run(suite());
    }

    public static Test suite() {
	return new TestSuite(ThreadLocalTest.class);
    }

    static ThreadLocal tl = new ThreadLocal() {
            public Object initialValue() {
                return one;
            }
        };

    static InheritableThreadLocal itl =
        new InheritableThreadLocal() {
            protected Object initialValue() {
                return zero;
            }

            protected Object childValue(Object parentValue) {
                return new Integer(((Integer)parentValue).intValue() + 1);
            }
        };

//    /**
//     * remove causes next access to return initial value
//     */
//    public void testRemove() {
//        assertEquals(tl.get(), one);
//        tl.set(two);
//        assertEquals(tl.get(), two);
//        tl.remove();
//        assertEquals(tl.get(), one);
//    }
//
//    /**
//     * remove in InheritableThreadLocal causes next access to return
//     * initial value
//     */
//    public void testRemoveITL() {
//        assertEquals(itl.get(), zero);
//        itl.set(two);
//        assertEquals(itl.get(), two);
//        itl.remove();
//        assertEquals(itl.get(), zero);
//    }

    private class ITLThread extends Thread {
        final int[] x;
        ITLThread(int[] array) { x = array; }
        public void run() {
            Thread child = null;
            if (((Integer)itl.get()).intValue() < x.length - 1) {
                child = new ITLThread(x);
                child.start();
            }
            Thread.currentThread().yield();

            int threadId = ((Integer)itl.get()).intValue();
            for (int j = 0; j < threadId; j++) {
                x[threadId]++;
                Thread.currentThread().yield();
            }

            if (child != null) { // Wait for child (if any)
                try {
                    child.join();
                } catch(InterruptedException e) {
                    threadUnexpectedException();
                }
            }
        }
    }

    /**
     * InheritableThreadLocal propagates generic values.
     */
    public void testGenericITL() {
        final int threadCount = 10;
        final int x[] = new int[threadCount];
        Thread progenitor = new ITLThread(x);
        try {
            progenitor.start();
            progenitor.join();
            for(int i = 0; i < threadCount; i++) {
                assertEquals(i, x[i]);
            }
        } catch(InterruptedException e) {
            unexpectedException();
        }
    }
}