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:	1.19
Committed:	Thu Sep 16 00:52:49 2010 UTC (13 years, 7 months ago) by jsr166
Branch:	MAIN
Changes since 1.18:	+5 -5 lines
Log Message:	testcase hygiene: introduce CheckedRecursiveAction and CheckedRecursiveTask; eliminate almost all threadAssertXXX; use preferred junit conventions;narrow the scope of exception checking code; make sure test failures in non-junit threads produce proper stacktraces
#	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/licenses/publicdomain
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	/**
39	* construction with field not of given type throws RuntimeException
40	*/
41	public void testConstructor2() {
42	try {
43	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
44	a = AtomicReferenceFieldUpdater.newUpdater
45	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "z");
46	shouldThrow();
47	} catch (RuntimeException success) {}
48	}
49
50	/**
51	* Constructor with non-volatile field throws exception
52	*/
53	public void testConstructor3() {
54	try {
55	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
56	a = AtomicReferenceFieldUpdater.newUpdater
57	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
58	shouldThrow();
59	} catch (RuntimeException success) {}
60	}
61
62	/**
63	* get returns the last value set or assigned
64	*/
65	public void testGetSet() {
66	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
67	try {
68	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
69	} catch (RuntimeException ok) {
70	return;
71	}
72	x = one;
73	assertSame(one,a.get(this));
74	a.set(this,two);
75	assertSame(two,a.get(this));
76	a.set(this,m3);
77	assertSame(m3,a.get(this));
78	}
79
80	/**
81	* get returns the last value lazySet by same thread
82	*/
83	public void testGetLazySet() {
84	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	assertSame(one,a.get(this));
92	a.lazySet(this,two);
93	assertSame(two,a.get(this));
94	a.lazySet(this,m3);
95	assertSame(m3,a.get(this));
96	}
97
98	/**
99	* compareAndSet succeeds in changing value if equal to expected else fails
100	*/
101	public void testCompareAndSet() {
102	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
103	try {
104	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
105	} catch (RuntimeException ok) {
106	return;
107	}
108	x = one;
109	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	assertFalse(seven == a.get(this));
114	assertTrue(a.compareAndSet(this, m4, seven));
115	assertSame(seven,a.get(this));
116	}
117
118	/**
119	* compareAndSet in one thread enables another waiting for value
120	* to succeed
121	*/
122	public void testCompareAndSetInMultipleThreads() throws Exception {
123	x = one;
124	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
125	try {
126	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
127	} catch (RuntimeException ok) {
128	return;
129	}
130
131	Thread t = new Thread(new CheckedRunnable() {
132	public void realRun() {
133	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
134	Thread.yield();
135	}});
136
137	t.start();
138	assertTrue(a.compareAndSet(this, one, two));
139	t.join(LONG_DELAY_MS);
140	assertFalse(t.isAlive());
141	assertSame(a.get(this), three);
142	}
143
144	/**
145	* repeated weakCompareAndSet succeeds in changing value when equal
146	* to expected
147	*/
148	public void testWeakCompareAndSet() {
149	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
150	try {
151	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
152	} catch (RuntimeException ok) {
153	return;
154	}
155	x = one;
156	while (!a.weakCompareAndSet(this,one,two));
157	while (!a.weakCompareAndSet(this,two,m4));
158	assertSame(m4,a.get(this));
159	while (!a.weakCompareAndSet(this,m4,seven));
160	assertSame(seven,a.get(this));
161	}
162
163	/**
164	* getAndSet returns previous value and sets to given value
165	*/
166	public void testGetAndSet() {
167	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
168	try {
169	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
170	} catch (RuntimeException ok) {
171	return;
172	}
173	x = one;
174	assertSame(one,a.getAndSet(this, zero));
175	assertSame(zero,a.getAndSet(this,m10));
176	assertSame(m10,a.getAndSet(this,1));
177	}
178
179	}