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 java.util.concurrent.atomic.*;
import junit.framework.*;
import java.util.*;

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(a.get(this), three);
    }

    /**
     * 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:	1.22
Committed:	Fri May 27 19:39:07 2011 UTC (12 years, 11 months ago) by jsr166
Branch:	MAIN
Changes since 1.21:	+0 -1 lines
Log Message:	whitespace
#	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 java.util.concurrent.atomic.*;
10			import junit.framework.*;
11			import java.util.*;
12
13	jsr166	1.13	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
14	dl	1.1	volatile Integer x = null;
15			Object z;
16			Integer w;
17
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	dl	1.3	/**
26	dl	1.7	* Construction with non-existent field throws RuntimeException
27	dl	1.3	*/
28	jsr166	1.13	public void testConstructor() {
29	jsr166	1.12	try {
30	dl	1.1	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
31			a = AtomicReferenceFieldUpdater.newUpdater
32	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "y");
33	dl	1.3	shouldThrow();
34	jsr166	1.17	} catch (RuntimeException success) {}
35	dl	1.1	}
36
37	dl	1.3	/**
38	dl	1.4	* construction with field not of given type throws RuntimeException
39	dl	1.3	*/
40	jsr166	1.13	public void testConstructor2() {
41	jsr166	1.12	try {
42	dl	1.1	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
43			a = AtomicReferenceFieldUpdater.newUpdater
44	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "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	dl	1.1	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
55			a = AtomicReferenceFieldUpdater.newUpdater
56	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
57	dl	1.3	shouldThrow();
58	jsr166	1.17	} catch (RuntimeException 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			try {
67			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
68			} catch (RuntimeException ok) {
69			return;
70			}
71	dl	1.1	x = one;
72	jsr166	1.18	assertSame(one,a.get(this));
73	jsr166	1.16	a.set(this,two);
74	jsr166	1.18	assertSame(two,a.get(this));
75	jsr166	1.16	a.set(this,m3);
76	jsr166	1.18	assertSame(m3,a.get(this));
77	dl	1.1	}
78	dl	1.10
79			/**
80	jsr166	1.20	* get returns the last value lazySet by same thread
81	dl	1.10	*/
82	jsr166	1.13	public void testGetLazySet() {
83	dl	1.10	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
84			try {
85			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
86			} catch (RuntimeException ok) {
87			return;
88			}
89			x = one;
90	jsr166	1.18	assertSame(one,a.get(this));
91	jsr166	1.16	a.lazySet(this,two);
92	jsr166	1.18	assertSame(two,a.get(this));
93	jsr166	1.16	a.lazySet(this,m3);
94	jsr166	1.18	assertSame(m3,a.get(this));
95	dl	1.10	}
96
97	dl	1.3	/**
98	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
99	dl	1.3	*/
100	jsr166	1.13	public void testCompareAndSet() {
101	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
102			try {
103			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
104			} catch (RuntimeException ok) {
105			return;
106			}
107	dl	1.1	x = one;
108	jsr166	1.19	assertTrue(a.compareAndSet(this, one, two));
109			assertTrue(a.compareAndSet(this, two, m4));
110			assertSame(m4, a.get(this));
111			assertFalse(a.compareAndSet(this, m5, seven));
112	jsr166	1.18	assertFalse(seven == a.get(this));
113	jsr166	1.19	assertTrue(a.compareAndSet(this, m4, seven));
114	jsr166	1.18	assertSame(seven,a.get(this));
115	dl	1.1	}
116
117	dl	1.3	/**
118	dl	1.4	* compareAndSet in one thread enables another waiting for value
119			* to succeed
120			*/
121	jsr166	1.14	public void testCompareAndSetInMultipleThreads() throws Exception {
122	dl	1.4	x = one;
123	dl	1.8	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
124			try {
125			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
126			} catch (RuntimeException ok) {
127			return;
128			}
129	dl	1.4
130	jsr166	1.15	Thread t = new Thread(new CheckedRunnable() {
131			public void realRun() {
132			while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
133			Thread.yield();
134			}});
135	jsr166	1.14
136			t.start();
137			assertTrue(a.compareAndSet(this, one, two));
138			t.join(LONG_DELAY_MS);
139			assertFalse(t.isAlive());
140	jsr166	1.18	assertSame(a.get(this), three);
141	dl	1.4	}
142
143			/**
144			* repeated weakCompareAndSet succeeds in changing value when equal
145	jsr166	1.11	* to expected
146	dl	1.3	*/
147	jsr166	1.13	public void testWeakCompareAndSet() {
148	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
149			try {
150			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
151			} catch (RuntimeException ok) {
152			return;
153			}
154	dl	1.1	x = one;
155	jsr166	1.16	while (!a.weakCompareAndSet(this,one,two));
156			while (!a.weakCompareAndSet(this,two,m4));
157	jsr166	1.18	assertSame(m4,a.get(this));
158	jsr166	1.16	while (!a.weakCompareAndSet(this,m4,seven));
159	jsr166	1.18	assertSame(seven,a.get(this));
160	dl	1.1	}
161
162	dl	1.3	/**
163	dl	1.4	* getAndSet returns previous value and sets to given value
164	dl	1.3	*/
165	jsr166	1.13	public void testGetAndSet() {
166	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
167			try {
168			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
169			} catch (RuntimeException ok) {
170			return;
171			}
172	dl	1.1	x = one;
173	jsr166	1.18	assertSame(one,a.getAndSet(this, zero));
174			assertSame(zero,a.getAndSet(this,m10));
175			assertSame(m10,a.getAndSet(this,1));
176	dl	1.1	}
177
178			}