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
#	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 java.util.concurrent.atomic.*;
10	import junit.framework.*;
11	import java.util.*;
12
13	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
14	volatile Integer x = null;
15	Object z;
16	Integer w;
17
18	public static void main(String[] args) {
19	junit.textui.TestRunner.run(suite());
20	}
21	public static Test suite() {
22	return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
23	}
24
25	/**
26	* Construction with non-existent field throws RuntimeException
27	*/
28	public void testConstructor() {
29	try {
30	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
31	a = AtomicReferenceFieldUpdater.newUpdater
32	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "y");
33	shouldThrow();
34	} catch (RuntimeException success) {}
35	}
36
37	/**
38	* construction with field not of given type throws RuntimeException
39	*/
40	public void testConstructor2() {
41	try {
42	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
43	a = AtomicReferenceFieldUpdater.newUpdater
44	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "z");
45	shouldThrow();
46	} catch (RuntimeException success) {}
47	}
48
49	/**
50	* Constructor with non-volatile field throws exception
51	*/
52	public void testConstructor3() {
53	try {
54	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
55	a = AtomicReferenceFieldUpdater.newUpdater
56	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
57	shouldThrow();
58	} catch (RuntimeException success) {}
59	}
60
61	/**
62	* get returns the last value set or assigned
63	*/
64	public void testGetSet() {
65	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
66	try {
67	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
68	} catch (RuntimeException ok) {
69	return;
70	}
71	x = one;
72	assertSame(one,a.get(this));
73	a.set(this,two);
74	assertSame(two,a.get(this));
75	a.set(this,m3);
76	assertSame(m3,a.get(this));
77	}
78
79	/**
80	* get returns the last value lazySet by same thread
81	*/
82	public void testGetLazySet() {
83	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	assertSame(one,a.get(this));
91	a.lazySet(this,two);
92	assertSame(two,a.get(this));
93	a.lazySet(this,m3);
94	assertSame(m3,a.get(this));
95	}
96
97	/**
98	* compareAndSet succeeds in changing value if equal to expected else fails
99	*/
100	public void testCompareAndSet() {
101	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
102	try {
103	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
104	} catch (RuntimeException ok) {
105	return;
106	}
107	x = one;
108	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	assertFalse(seven == a.get(this));
113	assertTrue(a.compareAndSet(this, m4, seven));
114	assertSame(seven,a.get(this));
115	}
116
117	/**
118	* compareAndSet in one thread enables another waiting for value
119	* to succeed
120	*/
121	public void testCompareAndSetInMultipleThreads() throws Exception {
122	x = one;
123	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
124	try {
125	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
126	} catch (RuntimeException ok) {
127	return;
128	}
129
130	Thread t = new Thread(new CheckedRunnable() {
131	public void realRun() {
132	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
133	Thread.yield();
134	}});
135
136	t.start();
137	assertTrue(a.compareAndSet(this, one, two));
138	t.join(LONG_DELAY_MS);
139	assertFalse(t.isAlive());
140	assertSame(a.get(this), three);
141	}
142
143	/**
144	* repeated weakCompareAndSet succeeds in changing value when equal
145	* to expected
146	*/
147	public void testWeakCompareAndSet() {
148	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
149	try {
150	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
151	} catch (RuntimeException ok) {
152	return;
153	}
154	x = one;
155	while (!a.weakCompareAndSet(this,one,two));
156	while (!a.weakCompareAndSet(this,two,m4));
157	assertSame(m4,a.get(this));
158	while (!a.weakCompareAndSet(this,m4,seven));
159	assertSame(seven,a.get(this));
160	}
161
162	/**
163	* getAndSet returns previous value and sets to given value
164	*/
165	public void testGetAndSet() {
166	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
167	try {
168	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
169	} catch (RuntimeException ok) {
170	return;
171	}
172	x = one;
173	assertSame(one,a.getAndSet(this, zero));
174	assertSame(zero,a.getAndSet(this,m10));
175	assertSame(m10,a.getAndSet(this,1));
176	}
177
178	}