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

import junit.framework.*;
import 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<Integer> tl = new ThreadLocal<Integer>() {
            public Integer initialValue() {
                return one;
            }
        };

    static InheritableThreadLocal<Integer> itl =
        new InheritableThreadLocal<Integer>() {
            protected Integer initialValue() {
                return zero;
            }
            
            protected Integer childValue(Integer parentValue) {
                return new 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 (itl.get().intValue() < x.length - 1) {
                child = new ITLThread(x);
                child.start();
            }
            Thread.currentThread().yield();
            
            int threadId = 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();
        }
    }
}
Revision:	1.6
Committed:	Fri Jul 31 23:37:31 2009 UTC (14 years, 9 months ago) by jsr166
Branch:	MAIN
Changes since 1.5:	+3 -4 lines
Log Message:	whitespace
#	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			* http://creativecommons.org/licenses/publicdomain
5			* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9			import junit.framework.*;
10			import java.util.concurrent.Semaphore;
11
12	dl	1.2	public class ThreadLocalTest extends JSR166TestCase {
13	dl	1.1	public static void main(String[] args) {
14			junit.textui.TestRunner.run(suite());
15			}
16
17			public static Test suite() {
18			return new TestSuite(ThreadLocalTest.class);
19			}
20
21	dl	1.5	static ThreadLocal<Integer> tl = new ThreadLocal<Integer>() {
22			public Integer initialValue() {
23			return one;
24			}
25			};
26
27			static InheritableThreadLocal<Integer> itl =
28			new InheritableThreadLocal<Integer>() {
29			protected Integer initialValue() {
30			return zero;
31			}
32
33			protected Integer childValue(Integer parentValue) {
34			return new Integer(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			assertEquals(tl.get(), one);
43			tl.set(two);
44			assertEquals(tl.get(), two);
45			tl.remove();
46			assertEquals(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			assertEquals(itl.get(), zero);
55			itl.set(two);
56			assertEquals(itl.get(), two);
57			itl.remove();
58			assertEquals(itl.get(), zero);
59			}
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			Thread.currentThread().yield();
71
72			int threadId = itl.get().intValue();
73			for (int j = 0; j < threadId; j++) {
74			x[threadId]++;
75			Thread.currentThread().yield();
76			}
77
78			if (child != null) { // Wait for child (if any)
79			try {
80			child.join();
81	jsr166	1.6	} catch (InterruptedException e) {
82	dl	1.5	threadUnexpectedException();
83			}
84			}
85			}
86			}
87
88			/**
89			* InheritableThreadLocal propagates generic values.
90			*/
91			public void testGenericITL() {
92			final int threadCount = 10;
93			final int x[] = new int[threadCount];
94			Thread progenitor = new ITLThread(x);
95			try {
96			progenitor.start();
97			progenitor.join();
98	jsr166	1.6	for (int i = 0; i < threadCount; i++) {
99	dl	1.5	assertEquals(i, x[i]);
100			}
101	jsr166	1.6	} catch (InterruptedException e) {
102	dl	1.5	unexpectedException();
103			}
104	dl	1.1	}
105			}