test/tck/ThreadLocalTest.java

/*
 * 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/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.Test;
import junit.framework.TestSuite;

public class ThreadLocalTest extends JSR166TestCase {
    public static void main(String[] args) {
        main(suite(), args);
    }

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

    static ThreadLocal<Item> tl = new ThreadLocal<Item>() {
            public Item initialValue() {
                return one;
            }
        };

    static InheritableThreadLocal<Item> itl =
        new InheritableThreadLocal<Item>() {
            protected Item initialValue() {
                return zero;
            }

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

    /**
     * remove causes next access to return initial value
     */
    public void testRemove() {
        assertSame(tl.get(), one);
        tl.set(two);
        assertSame(tl.get(), two);
        tl.remove();
        assertSame(tl.get(), one);
    }

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

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

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

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

    /**
     * InheritableThreadLocal propagates generic values.
     */
    public void testGenericITL() throws InterruptedException {
        final int threadCount = 10;
        final int[] x = new int[threadCount];
        Thread progenitor = new ITLThread(x);
        progenitor.start();
        progenitor.join();
        for (int i = 0; i < threadCount; i++) {
            assertEquals(i, x[i]);
        }
    }
}
Revision:	1.18
Committed:	Tue Jan 26 13:33:06 2021 UTC (3 years, 3 months ago) by dl
Branch:	MAIN
Changes since 1.17:	+7 -7 lines
Log Message:	Replace Integer with Item class
#	User	Rev	Content
1	dl	1.1	/*
2	dl	1.4	* Written by Doug Lea with assistance from members of JCP JSR-166
3			* Expert Group and released to the public domain, as explained at
4	jsr166	1.12	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.8	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9	jsr166	1.15	import junit.framework.Test;
10			import junit.framework.TestSuite;
11	dl	1.1
12	dl	1.2	public class ThreadLocalTest extends JSR166TestCase {
13	dl	1.1	public static void main(String[] args) {
14	jsr166	1.17	main(suite(), args);
15	dl	1.1	}
16	jsr166	1.8
17	dl	1.1	public static Test suite() {
18	jsr166	1.9	return new TestSuite(ThreadLocalTest.class);
19	dl	1.1	}
20
21	dl	1.18	static ThreadLocal<Item> tl = new ThreadLocal<Item>() {
22			public Item initialValue() {
23	dl	1.5	return one;
24			}
25			};
26
27	dl	1.18	static InheritableThreadLocal<Item> itl =
28			new InheritableThreadLocal<Item>() {
29			protected Item initialValue() {
30	dl	1.5	return zero;
31			}
32	jsr166	1.8
33	dl	1.18	protected Item childValue(Item parentValue) {
34			return new Item(parentValue.intValue() + 1);
35	dl	1.1	}
36			};
37
38	dl	1.3	/**
39			* remove causes next access to return initial value
40			*/
41	dl	1.1	public void testRemove() {
42	jsr166	1.11	assertSame(tl.get(), one);
43	dl	1.1	tl.set(two);
44	jsr166	1.11	assertSame(tl.get(), two);
45	dl	1.1	tl.remove();
46	jsr166	1.11	assertSame(tl.get(), one);
47	dl	1.5	}
48
49			/**
50			* remove in InheritableThreadLocal causes next access to return
51			* initial value
52			*/
53			public void testRemoveITL() {
54	jsr166	1.11	assertSame(itl.get(), zero);
55	dl	1.5	itl.set(two);
56	jsr166	1.11	assertSame(itl.get(), two);
57	dl	1.5	itl.remove();
58	jsr166	1.11	assertSame(itl.get(), zero);
59	dl	1.5	}
60
61			private class ITLThread extends Thread {
62			final int[] x;
63			ITLThread(int[] array) { x = array; }
64			public void run() {
65			Thread child = null;
66			if (itl.get().intValue() < x.length - 1) {
67			child = new ITLThread(x);
68			child.start();
69			}
70	jsr166	1.13	Thread.yield();
71	jsr166	1.8
72	dl	1.5	int threadId = itl.get().intValue();
73			for (int j = 0; j < threadId; j++) {
74			x[threadId]++;
75	jsr166	1.13	Thread.yield();
76	dl	1.5	}
77	jsr166	1.8
78	dl	1.5	if (child != null) { // Wait for child (if any)
79			try {
80			child.join();
81	jsr166	1.6	} catch (InterruptedException e) {
82	jsr166	1.7	threadUnexpectedException(e);
83	dl	1.5	}
84			}
85			}
86			}
87
88			/**
89			* InheritableThreadLocal propagates generic values.
90			*/
91	jsr166	1.10	public void testGenericITL() throws InterruptedException {
92	dl	1.5	final int threadCount = 10;
93	jsr166	1.16	final int[] x = new int[threadCount];
94	dl	1.5	Thread progenitor = new ITLThread(x);
95	jsr166	1.10	progenitor.start();
96			progenitor.join();
97			for (int i = 0; i < threadCount; i++) {
98			assertEquals(i, x[i]);
99	dl	1.5	}
100	dl	1.1	}
101			}