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;
    volatile int i;

    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 ClassCastException
     */
    public void testConstructor2() {
        try {
            updaterFor("z");
            shouldThrow();
        } catch (ClassCastException success) {}
    }

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

    /**
     * Constructor with non-reference field throws ClassCastException
     */
    public void testConstructor4() {
        try {
            updaterFor("i");
            shouldThrow();
        } catch (ClassCastException 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:	1.28
Committed:	Tue Apr 2 16:14:39 2013 UTC (11 years, 1 month ago) by jsr166
Branch:	MAIN
Changes since 1.27:	+13 -2 lines
Log Message:	fix exception specs to match reality, and update corresponding tck tests
#	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	jsr166	1.28	volatile int i;
17	dl	1.1
18	jsr166	1.13	public static void main(String[] args) {
19	dl	1.1	junit.textui.TestRunner.run(suite());
20			}
21			public static Test suite() {
22			return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
23			}
24
25	jsr166	1.26	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
26			return AtomicReferenceFieldUpdater.newUpdater
27			(AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName);
28			}
29
30	dl	1.3	/**
31	dl	1.7	* Construction with non-existent field throws RuntimeException
32	dl	1.3	*/
33	jsr166	1.13	public void testConstructor() {
34	jsr166	1.12	try {
35	jsr166	1.26	updaterFor("y");
36	dl	1.3	shouldThrow();
37	jsr166	1.27	} catch (RuntimeException success) {
38			assertTrue(success.getCause() != null);
39			}
40	dl	1.1	}
41
42	dl	1.3	/**
43	jsr166	1.28	* construction with field not of given type throws ClassCastException
44	dl	1.3	*/
45	jsr166	1.13	public void testConstructor2() {
46	jsr166	1.12	try {
47	jsr166	1.26	updaterFor("z");
48	dl	1.3	shouldThrow();
49	jsr166	1.28	} catch (ClassCastException success) {}
50	dl	1.1	}
51
52	dl	1.3	/**
53	jsr166	1.27	* Constructor with non-volatile field throws IllegalArgumentException
54	dl	1.3	*/
55	jsr166	1.13	public void testConstructor3() {
56	jsr166	1.12	try {
57	jsr166	1.26	updaterFor("w");
58	dl	1.3	shouldThrow();
59	jsr166	1.27	} catch (IllegalArgumentException success) {}
60	dl	1.1	}
61
62	dl	1.3	/**
63	jsr166	1.28	* Constructor with non-reference field throws ClassCastException
64			*/
65			public void testConstructor4() {
66			try {
67			updaterFor("i");
68			shouldThrow();
69			} catch (ClassCastException success) {}
70			}
71
72			/**
73	jsr166	1.20	* get returns the last value set or assigned
74	dl	1.3	*/
75	jsr166	1.13	public void testGetSet() {
76	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
77	jsr166	1.26	a = updaterFor("x");
78	dl	1.1	x = one;
79	jsr166	1.24	assertSame(one, a.get(this));
80			a.set(this, two);
81			assertSame(two, a.get(this));
82			a.set(this, m3);
83			assertSame(m3, a.get(this));
84	dl	1.1	}
85	dl	1.10
86			/**
87	jsr166	1.20	* get returns the last value lazySet by same thread
88	dl	1.10	*/
89	jsr166	1.13	public void testGetLazySet() {
90	dl	1.10	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
91	jsr166	1.26	a = updaterFor("x");
92	dl	1.10	x = one;
93	jsr166	1.24	assertSame(one, a.get(this));
94			a.lazySet(this, two);
95			assertSame(two, a.get(this));
96			a.lazySet(this, m3);
97			assertSame(m3, a.get(this));
98	dl	1.10	}
99
100	dl	1.3	/**
101	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
102	dl	1.3	*/
103	jsr166	1.13	public void testCompareAndSet() {
104	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
105	jsr166	1.26	a = updaterFor("x");
106	dl	1.1	x = one;
107	jsr166	1.19	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	jsr166	1.18	assertFalse(seven == a.get(this));
112	jsr166	1.19	assertTrue(a.compareAndSet(this, m4, seven));
113	jsr166	1.24	assertSame(seven, a.get(this));
114	dl	1.1	}
115
116	dl	1.3	/**
117	dl	1.4	* compareAndSet in one thread enables another waiting for value
118			* to succeed
119			*/
120	jsr166	1.14	public void testCompareAndSetInMultipleThreads() throws Exception {
121	dl	1.4	x = one;
122	dl	1.8	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
123	jsr166	1.26	a = updaterFor("x");
124	dl	1.4
125	jsr166	1.15	Thread t = new Thread(new CheckedRunnable() {
126			public void realRun() {
127			while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
128			Thread.yield();
129			}});
130	jsr166	1.14
131			t.start();
132			assertTrue(a.compareAndSet(this, one, two));
133			t.join(LONG_DELAY_MS);
134			assertFalse(t.isAlive());
135	jsr166	1.25	assertSame(three, a.get(this));
136	dl	1.4	}
137
138			/**
139			* repeated weakCompareAndSet succeeds in changing value when equal
140	jsr166	1.11	* to expected
141	dl	1.3	*/
142	jsr166	1.13	public void testWeakCompareAndSet() {
143	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
144	jsr166	1.26	a = updaterFor("x");
145	dl	1.1	x = one;
146	jsr166	1.24	while (!a.weakCompareAndSet(this, one, two));
147			while (!a.weakCompareAndSet(this, two, m4));
148			assertSame(m4, a.get(this));
149			while (!a.weakCompareAndSet(this, m4, seven));
150			assertSame(seven, a.get(this));
151	dl	1.1	}
152
153	dl	1.3	/**
154	dl	1.4	* getAndSet returns previous value and sets to given value
155	dl	1.3	*/
156	jsr166	1.13	public void testGetAndSet() {
157	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
158	jsr166	1.26	a = updaterFor("x");
159	dl	1.1	x = one;
160	jsr166	1.24	assertSame(one, a.getAndSet(this, zero));
161			assertSame(zero, a.getAndSet(this, m10));
162			assertSame(m10, a.getAndSet(this, 1));
163	dl	1.1	}
164
165			}