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) {}
    }

    /**
     * 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 exception
     */
    public void testConstructor3() {
        try {
            updaterFor("w");
            shouldThrow();
        } catch (RuntimeException 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:	1.26
Committed:	Mon Apr 1 20:58:58 2013 UTC (11 years, 1 month ago) by jsr166
Branch:	MAIN
Changes since 1.25:	+14 -39 lines
Log Message:	RuntimeException is not ok for valid fields; refactor a little
#	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	1.17	} catch (RuntimeException success) {}
37	dl	1.1	}
38
39	dl	1.3	/**
40	dl	1.4	* construction with field not of given type throws RuntimeException
41	dl	1.3	*/
42	jsr166	1.13	public void testConstructor2() {
43	jsr166	1.12	try {
44	jsr166	1.26	updaterFor("z");
45	dl	1.3	shouldThrow();
46	jsr166	1.17	} catch (RuntimeException success) {}
47	dl	1.1	}
48
49	dl	1.3	/**
50	dl	1.4	* Constructor with non-volatile field throws exception
51	dl	1.3	*/
52	jsr166	1.13	public void testConstructor3() {
53	jsr166	1.12	try {
54	jsr166	1.26	updaterFor("w");
55	dl	1.3	shouldThrow();
56	jsr166	1.17	} catch (RuntimeException success) {}
57	dl	1.1	}
58
59	dl	1.3	/**
60	jsr166	1.20	* get returns the last value set or assigned
61	dl	1.3	*/
62	jsr166	1.13	public void testGetSet() {
63	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
64	jsr166	1.26	a = updaterFor("x");
65	dl	1.1	x = one;
66	jsr166	1.24	assertSame(one, a.get(this));
67			a.set(this, two);
68			assertSame(two, a.get(this));
69			a.set(this, m3);
70			assertSame(m3, a.get(this));
71	dl	1.1	}
72	dl	1.10
73			/**
74	jsr166	1.20	* get returns the last value lazySet by same thread
75	dl	1.10	*/
76	jsr166	1.13	public void testGetLazySet() {
77	dl	1.10	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
78	jsr166	1.26	a = updaterFor("x");
79	dl	1.10	x = one;
80	jsr166	1.24	assertSame(one, a.get(this));
81			a.lazySet(this, two);
82			assertSame(two, a.get(this));
83			a.lazySet(this, m3);
84			assertSame(m3, a.get(this));
85	dl	1.10	}
86
87	dl	1.3	/**
88	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
89	dl	1.3	*/
90	jsr166	1.13	public void testCompareAndSet() {
91	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
92	jsr166	1.26	a = updaterFor("x");
93	dl	1.1	x = one;
94	jsr166	1.19	assertTrue(a.compareAndSet(this, one, two));
95			assertTrue(a.compareAndSet(this, two, m4));
96			assertSame(m4, a.get(this));
97			assertFalse(a.compareAndSet(this, m5, seven));
98	jsr166	1.18	assertFalse(seven == a.get(this));
99	jsr166	1.19	assertTrue(a.compareAndSet(this, m4, seven));
100	jsr166	1.24	assertSame(seven, a.get(this));
101	dl	1.1	}
102
103	dl	1.3	/**
104	dl	1.4	* compareAndSet in one thread enables another waiting for value
105			* to succeed
106			*/
107	jsr166	1.14	public void testCompareAndSetInMultipleThreads() throws Exception {
108	dl	1.4	x = one;
109	dl	1.8	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
110	jsr166	1.26	a = updaterFor("x");
111	dl	1.4
112	jsr166	1.15	Thread t = new Thread(new CheckedRunnable() {
113			public void realRun() {
114			while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
115			Thread.yield();
116			}});
117	jsr166	1.14
118			t.start();
119			assertTrue(a.compareAndSet(this, one, two));
120			t.join(LONG_DELAY_MS);
121			assertFalse(t.isAlive());
122	jsr166	1.25	assertSame(three, a.get(this));
123	dl	1.4	}
124
125			/**
126			* repeated weakCompareAndSet succeeds in changing value when equal
127	jsr166	1.11	* to expected
128	dl	1.3	*/
129	jsr166	1.13	public void testWeakCompareAndSet() {
130	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
131	jsr166	1.26	a = updaterFor("x");
132	dl	1.1	x = one;
133	jsr166	1.24	while (!a.weakCompareAndSet(this, one, two));
134			while (!a.weakCompareAndSet(this, two, m4));
135			assertSame(m4, a.get(this));
136			while (!a.weakCompareAndSet(this, m4, seven));
137			assertSame(seven, a.get(this));
138	dl	1.1	}
139
140	dl	1.3	/**
141	dl	1.4	* getAndSet returns previous value and sets to given value
142	dl	1.3	*/
143	jsr166	1.13	public void testGetAndSet() {
144	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
145	jsr166	1.26	a = updaterFor("x");
146	dl	1.1	x = one;
147	jsr166	1.24	assertSame(one, a.getAndSet(this, zero));
148			assertSame(zero, a.getAndSet(this, m10));
149			assertSame(m10, a.getAndSet(this, 1));
150	dl	1.1	}
151
152			}