test/tck/AtomicReferenceFieldUpdaterTest.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.*;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;

public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
    volatile Integer x = null;
    Object z;
    Integer w;

    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
    }

    /**
     * Construction with non-existent field throws RuntimeException
     */
    public void testConstructor() {
        try {
            AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
                a = AtomicReferenceFieldUpdater.newUpdater
                (AtomicReferenceFieldUpdaterTest.class, Integer.class, "y");
            shouldThrow();
        } catch (RuntimeException success) {}
    }

    /**
     * construction with field not of given type throws RuntimeException
     */
    public void testConstructor2() {
        try {
            AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
                a = AtomicReferenceFieldUpdater.newUpdater
                (AtomicReferenceFieldUpdaterTest.class, Integer.class, "z");
            shouldThrow();
        } catch (RuntimeException success) {}
    }

    /**
     * Constructor with non-volatile field throws exception
     */
    public void testConstructor3() {
        try {
            AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
                a = AtomicReferenceFieldUpdater.newUpdater
                (AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
            shouldThrow();
        } catch (RuntimeException success) {}
    }

    /**
     * get returns the last value set or assigned
     */
    public void testGetSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
        try {
            a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = one;
        assertSame(one, a.get(this));
        a.set(this, two);
        assertSame(two, a.get(this));
        a.set(this, m3);
        assertSame(m3, a.get(this));
    }

    /**
     * get returns the last value lazySet by same thread
     */
    public void testGetLazySet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
        try {
            a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = one;
        assertSame(one, a.get(this));
        a.lazySet(this, two);
        assertSame(two, a.get(this));
        a.lazySet(this, m3);
        assertSame(m3, a.get(this));
    }

    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
        try {
            a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = one;
        assertTrue(a.compareAndSet(this, one, two));
        assertTrue(a.compareAndSet(this, two, m4));
        assertSame(m4, a.get(this));
        assertFalse(a.compareAndSet(this, m5, seven));
        assertFalse(seven == a.get(this));
        assertTrue(a.compareAndSet(this, m4, seven));
        assertSame(seven, a.get(this));
    }

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() throws Exception {
        x = one;
        final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
        try {
            a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
        } catch (RuntimeException ok) {
            return;
        }

        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
                    Thread.yield();
            }});

        t.start();
        assertTrue(a.compareAndSet(this, one, two));
        t.join(LONG_DELAY_MS);
        assertFalse(t.isAlive());
        assertSame(three, a.get(this));
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
        try {
            a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = one;
        while (!a.weakCompareAndSet(this, one, two));
        while (!a.weakCompareAndSet(this, two, m4));
        assertSame(m4, a.get(this));
        while (!a.weakCompareAndSet(this, m4, seven));
        assertSame(seven, a.get(this));
    }

    /**
     * getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
        try {
            a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = one;
        assertSame(one, a.getAndSet(this, zero));
        assertSame(zero, a.getAndSet(this, m10));
        assertSame(m10, a.getAndSet(this, 1));
    }

}
Revision:	1.25
Committed:	Fri Jun 10 20:17:11 2011 UTC (12 years, 10 months ago) by jsr166
Branch:	MAIN
Changes since 1.24:	+1 -1 lines
Log Message:	fix order of arguments to assert(Equals\|Same) methods
#	Content
1	/*
2	* 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/publicdomain/zero/1.0/
5	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	* Pat Fisher, Mike Judd.
7	*/
8
9	import junit.framework.*;
10	import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
11
12	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
13	volatile Integer x = null;
14	Object z;
15	Integer w;
16
17	public static void main(String[] args) {
18	junit.textui.TestRunner.run(suite());
19	}
20	public static Test suite() {
21	return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
22	}
23
24	/**
25	* Construction with non-existent field throws RuntimeException
26	*/
27	public void testConstructor() {
28	try {
29	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
30	a = AtomicReferenceFieldUpdater.newUpdater
31	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "y");
32	shouldThrow();
33	} catch (RuntimeException success) {}
34	}
35
36	/**
37	* construction with field not of given type throws RuntimeException
38	*/
39	public void testConstructor2() {
40	try {
41	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
42	a = AtomicReferenceFieldUpdater.newUpdater
43	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "z");
44	shouldThrow();
45	} catch (RuntimeException success) {}
46	}
47
48	/**
49	* Constructor with non-volatile field throws exception
50	*/
51	public void testConstructor3() {
52	try {
53	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
54	a = AtomicReferenceFieldUpdater.newUpdater
55	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
56	shouldThrow();
57	} catch (RuntimeException success) {}
58	}
59
60	/**
61	* get returns the last value set or assigned
62	*/
63	public void testGetSet() {
64	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
65	try {
66	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
67	} catch (RuntimeException ok) {
68	return;
69	}
70	x = one;
71	assertSame(one, a.get(this));
72	a.set(this, two);
73	assertSame(two, a.get(this));
74	a.set(this, m3);
75	assertSame(m3, a.get(this));
76	}
77
78	/**
79	* get returns the last value lazySet by same thread
80	*/
81	public void testGetLazySet() {
82	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
83	try {
84	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
85	} catch (RuntimeException ok) {
86	return;
87	}
88	x = one;
89	assertSame(one, a.get(this));
90	a.lazySet(this, two);
91	assertSame(two, a.get(this));
92	a.lazySet(this, m3);
93	assertSame(m3, a.get(this));
94	}
95
96	/**
97	* compareAndSet succeeds in changing value if equal to expected else fails
98	*/
99	public void testCompareAndSet() {
100	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
101	try {
102	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
103	} catch (RuntimeException ok) {
104	return;
105	}
106	x = one;
107	assertTrue(a.compareAndSet(this, one, two));
108	assertTrue(a.compareAndSet(this, two, m4));
109	assertSame(m4, a.get(this));
110	assertFalse(a.compareAndSet(this, m5, seven));
111	assertFalse(seven == a.get(this));
112	assertTrue(a.compareAndSet(this, m4, seven));
113	assertSame(seven, a.get(this));
114	}
115
116	/**
117	* compareAndSet in one thread enables another waiting for value
118	* to succeed
119	*/
120	public void testCompareAndSetInMultipleThreads() throws Exception {
121	x = one;
122	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
123	try {
124	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
125	} catch (RuntimeException ok) {
126	return;
127	}
128
129	Thread t = new Thread(new CheckedRunnable() {
130	public void realRun() {
131	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
132	Thread.yield();
133	}});
134
135	t.start();
136	assertTrue(a.compareAndSet(this, one, two));
137	t.join(LONG_DELAY_MS);
138	assertFalse(t.isAlive());
139	assertSame(three, a.get(this));
140	}
141
142	/**
143	* repeated weakCompareAndSet succeeds in changing value when equal
144	* to expected
145	*/
146	public void testWeakCompareAndSet() {
147	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
148	try {
149	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
150	} catch (RuntimeException ok) {
151	return;
152	}
153	x = one;
154	while (!a.weakCompareAndSet(this, one, two));
155	while (!a.weakCompareAndSet(this, two, m4));
156	assertSame(m4, a.get(this));
157	while (!a.weakCompareAndSet(this, m4, seven));
158	assertSame(seven, a.get(this));
159	}
160
161	/**
162	* getAndSet returns previous value and sets to given value
163	*/
164	public void testGetAndSet() {
165	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
166	try {
167	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
168	} catch (RuntimeException ok) {
169	return;
170	}
171	x = one;
172	assertSame(one, a.getAndSet(this, zero));
173	assertSame(zero, a.getAndSet(this, m10));
174	assertSame(m10, a.getAndSet(this, 1));
175	}
176
177	}