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);
    }

    AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
        return AtomicReferenceFieldUpdater.newUpdater
            (AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName);
    }

    /**
     * Construction with non-existent field throws RuntimeException
     */
    public void testConstructor() {
        try {
            updaterFor("y");
            shouldThrow();
        } catch (RuntimeException success) {
            assertTrue(success.getCause() != null);
        }
    }

    /**
     * construction with field not of given type throws RuntimeException
     */
    public void testConstructor2() {
        try {
            updaterFor("z");
            shouldThrow();
        } catch (RuntimeException success) {}
    }

    /**
     * Constructor with non-volatile field throws IllegalArgumentException
     */
    public void testConstructor3() {
        try {
            updaterFor("w");
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * get returns the last value set or assigned
     */
    public void testGetSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");

        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        x = one;
        assertSame(one, a.getAndSet(this, zero));
        assertSame(zero, a.getAndSet(this, m10));
        assertSame(m10, a.getAndSet(this, 1));
    }

}
Revision:	1.27
Committed:	Tue Apr 2 04:11:28 2013 UTC (11 years, 1 month ago) by jsr166
Branch:	MAIN
Changes since 1.26:	+5 -3 lines
Log Message:	tighten tests to match specs
#	User	Rev	Content
1	dl	1.1	/*
2	dl	1.6	* 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	1.21	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.11	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9			import junit.framework.*;
10	jsr166	1.23	import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
11	dl	1.1
12	jsr166	1.13	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
13	dl	1.1	volatile Integer x = null;
14			Object z;
15			Integer w;
16
17	jsr166	1.13	public static void main(String[] args) {
18	dl	1.1	junit.textui.TestRunner.run(suite());
19			}
20			public static Test suite() {
21			return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
22			}
23
24	jsr166	1.26	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
25			return AtomicReferenceFieldUpdater.newUpdater
26			(AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName);
27			}
28
29	dl	1.3	/**
30	dl	1.7	* Construction with non-existent field throws RuntimeException
31	dl	1.3	*/
32	jsr166	1.13	public void testConstructor() {
33	jsr166	1.12	try {
34	jsr166	1.26	updaterFor("y");
35	dl	1.3	shouldThrow();
36	jsr166	1.27	} catch (RuntimeException success) {
37			assertTrue(success.getCause() != null);
38			}
39	dl	1.1	}
40
41	dl	1.3	/**
42	dl	1.4	* construction with field not of given type throws RuntimeException
43	dl	1.3	*/
44	jsr166	1.13	public void testConstructor2() {
45	jsr166	1.12	try {
46	jsr166	1.26	updaterFor("z");
47	dl	1.3	shouldThrow();
48	jsr166	1.17	} catch (RuntimeException success) {}
49	dl	1.1	}
50
51	dl	1.3	/**
52	jsr166	1.27	* Constructor with non-volatile field throws IllegalArgumentException
53	dl	1.3	*/
54	jsr166	1.13	public void testConstructor3() {
55	jsr166	1.12	try {
56	jsr166	1.26	updaterFor("w");
57	dl	1.3	shouldThrow();
58	jsr166	1.27	} catch (IllegalArgumentException success) {}
59	dl	1.1	}
60
61	dl	1.3	/**
62	jsr166	1.20	* get returns the last value set or assigned
63	dl	1.3	*/
64	jsr166	1.13	public void testGetSet() {
65	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
66	jsr166	1.26	a = updaterFor("x");
67	dl	1.1	x = one;
68	jsr166	1.24	assertSame(one, a.get(this));
69			a.set(this, two);
70			assertSame(two, a.get(this));
71			a.set(this, m3);
72			assertSame(m3, a.get(this));
73	dl	1.1	}
74	dl	1.10
75			/**
76	jsr166	1.20	* get returns the last value lazySet by same thread
77	dl	1.10	*/
78	jsr166	1.13	public void testGetLazySet() {
79	dl	1.10	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
80	jsr166	1.26	a = updaterFor("x");
81	dl	1.10	x = one;
82	jsr166	1.24	assertSame(one, a.get(this));
83			a.lazySet(this, two);
84			assertSame(two, a.get(this));
85			a.lazySet(this, m3);
86			assertSame(m3, a.get(this));
87	dl	1.10	}
88
89	dl	1.3	/**
90	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
91	dl	1.3	*/
92	jsr166	1.13	public void testCompareAndSet() {
93	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
94	jsr166	1.26	a = updaterFor("x");
95	dl	1.1	x = one;
96	jsr166	1.19	assertTrue(a.compareAndSet(this, one, two));
97			assertTrue(a.compareAndSet(this, two, m4));
98			assertSame(m4, a.get(this));
99			assertFalse(a.compareAndSet(this, m5, seven));
100	jsr166	1.18	assertFalse(seven == a.get(this));
101	jsr166	1.19	assertTrue(a.compareAndSet(this, m4, seven));
102	jsr166	1.24	assertSame(seven, a.get(this));
103	dl	1.1	}
104
105	dl	1.3	/**
106	dl	1.4	* compareAndSet in one thread enables another waiting for value
107			* to succeed
108			*/
109	jsr166	1.14	public void testCompareAndSetInMultipleThreads() throws Exception {
110	dl	1.4	x = one;
111	dl	1.8	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
112	jsr166	1.26	a = updaterFor("x");
113	dl	1.4
114	jsr166	1.15	Thread t = new Thread(new CheckedRunnable() {
115			public void realRun() {
116			while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
117			Thread.yield();
118			}});
119	jsr166	1.14
120			t.start();
121			assertTrue(a.compareAndSet(this, one, two));
122			t.join(LONG_DELAY_MS);
123			assertFalse(t.isAlive());
124	jsr166	1.25	assertSame(three, a.get(this));
125	dl	1.4	}
126
127			/**
128			* repeated weakCompareAndSet succeeds in changing value when equal
129	jsr166	1.11	* to expected
130	dl	1.3	*/
131	jsr166	1.13	public void testWeakCompareAndSet() {
132	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
133	jsr166	1.26	a = updaterFor("x");
134	dl	1.1	x = one;
135	jsr166	1.24	while (!a.weakCompareAndSet(this, one, two));
136			while (!a.weakCompareAndSet(this, two, m4));
137			assertSame(m4, a.get(this));
138			while (!a.weakCompareAndSet(this, m4, seven));
139			assertSame(seven, a.get(this));
140	dl	1.1	}
141
142	dl	1.3	/**
143	dl	1.4	* getAndSet returns previous value and sets to given value
144	dl	1.3	*/
145	jsr166	1.13	public void testGetAndSet() {
146	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
147	jsr166	1.26	a = updaterFor("x");
148	dl	1.1	x = one;
149	jsr166	1.24	assertSame(one, a.getAndSet(this, zero));
150			assertSame(zero, a.getAndSet(this, m10));
151			assertSame(m10, a.getAndSet(this, 1));
152	dl	1.1	}
153
154			}