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/licenses/publicdomain
 * 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:	1.20
Committed:	Sat Oct 9 19:30:34 2010 UTC (13 years, 6 months ago) by jsr166
Branch:	MAIN
Changes since 1.19:	+2 -2 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			* http://creativecommons.org/licenses/publicdomain
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
38	dl	1.3	/**
39	dl	1.4	* construction with field not of given type throws RuntimeException
40	dl	1.3	*/
41	jsr166	1.13	public void testConstructor2() {
42	jsr166	1.12	try {
43	dl	1.1	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
44			a = AtomicReferenceFieldUpdater.newUpdater
45	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "z");
46	dl	1.3	shouldThrow();
47	jsr166	1.17	} catch (RuntimeException success) {}
48	dl	1.1	}
49
50	dl	1.3	/**
51	dl	1.4	* Constructor with non-volatile field throws exception
52	dl	1.3	*/
53	jsr166	1.13	public void testConstructor3() {
54	jsr166	1.12	try {
55	dl	1.1	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
56			a = AtomicReferenceFieldUpdater.newUpdater
57	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
58	dl	1.3	shouldThrow();
59	jsr166	1.17	} catch (RuntimeException success) {}
60	dl	1.1	}
61
62	dl	1.3	/**
63	jsr166	1.20	* get returns the last value set or assigned
64	dl	1.3	*/
65	jsr166	1.13	public void testGetSet() {
66	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
67			try {
68			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
69			} catch (RuntimeException ok) {
70			return;
71			}
72	dl	1.1	x = one;
73	jsr166	1.18	assertSame(one,a.get(this));
74	jsr166	1.16	a.set(this,two);
75	jsr166	1.18	assertSame(two,a.get(this));
76	jsr166	1.16	a.set(this,m3);
77	jsr166	1.18	assertSame(m3,a.get(this));
78	dl	1.1	}
79	dl	1.10
80			/**
81	jsr166	1.20	* get returns the last value lazySet by same thread
82	dl	1.10	*/
83	jsr166	1.13	public void testGetLazySet() {
84	dl	1.10	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
85			try {
86			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
87			} catch (RuntimeException ok) {
88			return;
89			}
90			x = one;
91	jsr166	1.18	assertSame(one,a.get(this));
92	jsr166	1.16	a.lazySet(this,two);
93	jsr166	1.18	assertSame(two,a.get(this));
94	jsr166	1.16	a.lazySet(this,m3);
95	jsr166	1.18	assertSame(m3,a.get(this));
96	dl	1.10	}
97
98	dl	1.3	/**
99	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
100	dl	1.3	*/
101	jsr166	1.13	public void testCompareAndSet() {
102	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
103			try {
104			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
105			} catch (RuntimeException ok) {
106			return;
107			}
108	dl	1.1	x = one;
109	jsr166	1.19	assertTrue(a.compareAndSet(this, one, two));
110			assertTrue(a.compareAndSet(this, two, m4));
111			assertSame(m4, a.get(this));
112			assertFalse(a.compareAndSet(this, m5, seven));
113	jsr166	1.18	assertFalse(seven == a.get(this));
114	jsr166	1.19	assertTrue(a.compareAndSet(this, m4, seven));
115	jsr166	1.18	assertSame(seven,a.get(this));
116	dl	1.1	}
117
118	dl	1.3	/**
119	dl	1.4	* compareAndSet in one thread enables another waiting for value
120			* to succeed
121			*/
122	jsr166	1.14	public void testCompareAndSetInMultipleThreads() throws Exception {
123	dl	1.4	x = one;
124	dl	1.8	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
125			try {
126			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
127			} catch (RuntimeException ok) {
128			return;
129			}
130	dl	1.4
131	jsr166	1.15	Thread t = new Thread(new CheckedRunnable() {
132			public void realRun() {
133			while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
134			Thread.yield();
135			}});
136	jsr166	1.14
137			t.start();
138			assertTrue(a.compareAndSet(this, one, two));
139			t.join(LONG_DELAY_MS);
140			assertFalse(t.isAlive());
141	jsr166	1.18	assertSame(a.get(this), three);
142	dl	1.4	}
143
144			/**
145			* repeated weakCompareAndSet succeeds in changing value when equal
146	jsr166	1.11	* to expected
147	dl	1.3	*/
148	jsr166	1.13	public void testWeakCompareAndSet() {
149	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
150			try {
151			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
152			} catch (RuntimeException ok) {
153			return;
154			}
155	dl	1.1	x = one;
156	jsr166	1.16	while (!a.weakCompareAndSet(this,one,two));
157			while (!a.weakCompareAndSet(this,two,m4));
158	jsr166	1.18	assertSame(m4,a.get(this));
159	jsr166	1.16	while (!a.weakCompareAndSet(this,m4,seven));
160	jsr166	1.18	assertSame(seven,a.get(this));
161	dl	1.1	}
162
163	dl	1.3	/**
164	dl	1.4	* getAndSet returns previous value and sets to given value
165	dl	1.3	*/
166	jsr166	1.13	public void testGetAndSet() {
167	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
168			try {
169			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
170			} catch (RuntimeException ok) {
171			return;
172			}
173	dl	1.1	x = one;
174	jsr166	1.18	assertSame(one,a.getAndSet(this, zero));
175			assertSame(zero,a.getAndSet(this,m10));
176			assertSame(m10,a.getAndSet(this,1));
177	dl	1.1	}
178
179			}