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
#	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	dl	1.3	/**
25	dl	1.7	* Construction with non-existent field throws RuntimeException
26	dl	1.3	*/
27	jsr166	1.13	public void testConstructor() {
28	jsr166	1.12	try {
29	dl	1.1	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
30			a = AtomicReferenceFieldUpdater.newUpdater
31	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "y");
32	dl	1.3	shouldThrow();
33	jsr166	1.17	} catch (RuntimeException success) {}
34	dl	1.1	}
35
36	dl	1.3	/**
37	dl	1.4	* construction with field not of given type throws RuntimeException
38	dl	1.3	*/
39	jsr166	1.13	public void testConstructor2() {
40	jsr166	1.12	try {
41	dl	1.1	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
42			a = AtomicReferenceFieldUpdater.newUpdater
43	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "z");
44	dl	1.3	shouldThrow();
45	jsr166	1.17	} catch (RuntimeException success) {}
46	dl	1.1	}
47
48	dl	1.3	/**
49	dl	1.4	* Constructor with non-volatile field throws exception
50	dl	1.3	*/
51	jsr166	1.13	public void testConstructor3() {
52	jsr166	1.12	try {
53	dl	1.1	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
54			a = AtomicReferenceFieldUpdater.newUpdater
55	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
56	dl	1.3	shouldThrow();
57	jsr166	1.17	} catch (RuntimeException success) {}
58	dl	1.1	}
59
60	dl	1.3	/**
61	jsr166	1.20	* get returns the last value set or assigned
62	dl	1.3	*/
63	jsr166	1.13	public void testGetSet() {
64	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
65			try {
66			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
67			} catch (RuntimeException ok) {
68			return;
69			}
70	dl	1.1	x = one;
71	jsr166	1.24	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	dl	1.1	}
77	dl	1.10
78			/**
79	jsr166	1.20	* get returns the last value lazySet by same thread
80	dl	1.10	*/
81	jsr166	1.13	public void testGetLazySet() {
82	dl	1.10	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	jsr166	1.24	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	dl	1.10	}
95
96	dl	1.3	/**
97	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
98	dl	1.3	*/
99	jsr166	1.13	public void testCompareAndSet() {
100	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
101			try {
102			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
103			} catch (RuntimeException ok) {
104			return;
105			}
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			try {
124			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
125			} catch (RuntimeException ok) {
126			return;
127			}
128	dl	1.4
129	jsr166	1.15	Thread t = new Thread(new CheckedRunnable() {
130			public void realRun() {
131			while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
132			Thread.yield();
133			}});
134	jsr166	1.14
135			t.start();
136			assertTrue(a.compareAndSet(this, one, two));
137			t.join(LONG_DELAY_MS);
138			assertFalse(t.isAlive());
139	jsr166	1.25	assertSame(three, a.get(this));
140	dl	1.4	}
141
142			/**
143			* repeated weakCompareAndSet succeeds in changing value when equal
144	jsr166	1.11	* to expected
145	dl	1.3	*/
146	jsr166	1.13	public void testWeakCompareAndSet() {
147	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
148			try {
149			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
150			} catch (RuntimeException ok) {
151			return;
152			}
153	dl	1.1	x = one;
154	jsr166	1.24	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	dl	1.1	}
160
161	dl	1.3	/**
162	dl	1.4	* getAndSet returns previous value and sets to given value
163	dl	1.3	*/
164	jsr166	1.13	public void testGetAndSet() {
165	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
166			try {
167			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
168			} catch (RuntimeException ok) {
169			return;
170			}
171	dl	1.1	x = one;
172	jsr166	1.24	assertSame(one, a.getAndSet(this, zero));
173			assertSame(zero, a.getAndSet(this, m10));
174			assertSame(m10, a.getAndSet(this, 1));
175	dl	1.1	}
176
177			}