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
#	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	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
25	return AtomicReferenceFieldUpdater.newUpdater
26	(AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName);
27	}
28
29	/**
30	* Construction with non-existent field throws RuntimeException
31	*/
32	public void testConstructor() {
33	try {
34	updaterFor("y");
35	shouldThrow();
36	} catch (RuntimeException success) {
37	assertTrue(success.getCause() != null);
38	}
39	}
40
41	/**
42	* construction with field not of given type throws RuntimeException
43	*/
44	public void testConstructor2() {
45	try {
46	updaterFor("z");
47	shouldThrow();
48	} catch (RuntimeException success) {}
49	}
50
51	/**
52	* Constructor with non-volatile field throws IllegalArgumentException
53	*/
54	public void testConstructor3() {
55	try {
56	updaterFor("w");
57	shouldThrow();
58	} catch (IllegalArgumentException success) {}
59	}
60
61	/**
62	* get returns the last value set or assigned
63	*/
64	public void testGetSet() {
65	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
66	a = updaterFor("x");
67	x = one;
68	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	}
74
75	/**
76	* get returns the last value lazySet by same thread
77	*/
78	public void testGetLazySet() {
79	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
80	a = updaterFor("x");
81	x = one;
82	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	}
88
89	/**
90	* compareAndSet succeeds in changing value if equal to expected else fails
91	*/
92	public void testCompareAndSet() {
93	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
94	a = updaterFor("x");
95	x = one;
96	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	assertFalse(seven == a.get(this));
101	assertTrue(a.compareAndSet(this, m4, seven));
102	assertSame(seven, a.get(this));
103	}
104
105	/**
106	* compareAndSet in one thread enables another waiting for value
107	* to succeed
108	*/
109	public void testCompareAndSetInMultipleThreads() throws Exception {
110	x = one;
111	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
112	a = updaterFor("x");
113
114	Thread t = new Thread(new CheckedRunnable() {
115	public void realRun() {
116	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
117	Thread.yield();
118	}});
119
120	t.start();
121	assertTrue(a.compareAndSet(this, one, two));
122	t.join(LONG_DELAY_MS);
123	assertFalse(t.isAlive());
124	assertSame(three, a.get(this));
125	}
126
127	/**
128	* repeated weakCompareAndSet succeeds in changing value when equal
129	* to expected
130	*/
131	public void testWeakCompareAndSet() {
132	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
133	a = updaterFor("x");
134	x = one;
135	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	}
141
142	/**
143	* getAndSet returns previous value and sets to given value
144	*/
145	public void testGetAndSet() {
146	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
147	a = updaterFor("x");
148	x = one;
149	assertSame(one, a.getAndSet(this, zero));
150	assertSame(zero, a.getAndSet(this, m10));
151	assertSame(m10, a.getAndSet(this, 1));
152	}
153
154	}