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.AtomicReferenceFieldUpdater;

import junit.framework.Test;
import junit.framework.TestSuite;

public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
    volatile Integer x = null;
    Object z;
    Integer w;
    volatile int i;

    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
    }

    AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
        return AtomicReferenceFieldUpdater.newUpdater
            (AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName);
    }

    /**
     * Construction with non-existent field throws RuntimeException
     */
    public void testConstructor() {
        try {
            updaterFor("y");
            shouldThrow();
        } catch (RuntimeException success) {
            assertNotNull(success.getCause());
        }
    }

    /**
     * construction with field not of given type throws ClassCastException
     */
    public void testConstructor2() {
        try {
            updaterFor("z");
            shouldThrow();
        } catch (ClassCastException success) {}
    }

    /**
     * Constructor with non-volatile field throws IllegalArgumentException
     */
    public void testConstructor3() {
        try {
            updaterFor("w");
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * Constructor with non-reference field throws ClassCastException
     */
    public void testConstructor4() {
        try {
            updaterFor("i");
            shouldThrow();
        } catch (ClassCastException success) {}
    }

    /**
     * get returns the last value set or assigned
     */
    public void testGetSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");

        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        x = one;
        assertSame(one, a.getAndSet(this, zero));
        assertSame(zero, a.getAndSet(this, m10));
        assertSame(m10, a.getAndSet(this, 1));
    }

}
Revision:	1.30
Committed:	Wed Dec 31 19:05:42 2014 UTC (9 years, 4 months ago) by jsr166
Branch:	MAIN
Changes since 1.29:	+3 -1 lines
Log Message:	no wildcard imports
#	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	jsr166	1.23	import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
10	dl	1.1
11	jsr166	1.30	import junit.framework.Test;
12			import junit.framework.TestSuite;
13
14	jsr166	1.13	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
15	dl	1.1	volatile Integer x = null;
16			Object z;
17			Integer w;
18	jsr166	1.28	volatile int i;
19	dl	1.1
20	jsr166	1.13	public static void main(String[] args) {
21	dl	1.1	junit.textui.TestRunner.run(suite());
22			}
23			public static Test suite() {
24			return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
25			}
26
27	jsr166	1.26	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
28			return AtomicReferenceFieldUpdater.newUpdater
29			(AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName);
30			}
31
32	dl	1.3	/**
33	dl	1.7	* Construction with non-existent field throws RuntimeException
34	dl	1.3	*/
35	jsr166	1.13	public void testConstructor() {
36	jsr166	1.12	try {
37	jsr166	1.26	updaterFor("y");
38	dl	1.3	shouldThrow();
39	jsr166	1.27	} catch (RuntimeException success) {
40	jsr166	1.29	assertNotNull(success.getCause());
41	jsr166	1.27	}
42	dl	1.1	}
43
44	dl	1.3	/**
45	jsr166	1.28	* construction with field not of given type throws ClassCastException
46	dl	1.3	*/
47	jsr166	1.13	public void testConstructor2() {
48	jsr166	1.12	try {
49	jsr166	1.26	updaterFor("z");
50	dl	1.3	shouldThrow();
51	jsr166	1.28	} catch (ClassCastException success) {}
52	dl	1.1	}
53
54	dl	1.3	/**
55	jsr166	1.27	* Constructor with non-volatile field throws IllegalArgumentException
56	dl	1.3	*/
57	jsr166	1.13	public void testConstructor3() {
58	jsr166	1.12	try {
59	jsr166	1.26	updaterFor("w");
60	dl	1.3	shouldThrow();
61	jsr166	1.27	} catch (IllegalArgumentException success) {}
62	dl	1.1	}
63
64	dl	1.3	/**
65	jsr166	1.28	* Constructor with non-reference field throws ClassCastException
66			*/
67			public void testConstructor4() {
68			try {
69			updaterFor("i");
70			shouldThrow();
71			} catch (ClassCastException success) {}
72			}
73
74			/**
75	jsr166	1.20	* get returns the last value set or assigned
76	dl	1.3	*/
77	jsr166	1.13	public void testGetSet() {
78	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
79	jsr166	1.26	a = updaterFor("x");
80	dl	1.1	x = one;
81	jsr166	1.24	assertSame(one, a.get(this));
82			a.set(this, two);
83			assertSame(two, a.get(this));
84			a.set(this, m3);
85			assertSame(m3, a.get(this));
86	dl	1.1	}
87	dl	1.10
88			/**
89	jsr166	1.20	* get returns the last value lazySet by same thread
90	dl	1.10	*/
91	jsr166	1.13	public void testGetLazySet() {
92	dl	1.10	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
93	jsr166	1.26	a = updaterFor("x");
94	dl	1.10	x = one;
95	jsr166	1.24	assertSame(one, a.get(this));
96			a.lazySet(this, two);
97			assertSame(two, a.get(this));
98			a.lazySet(this, m3);
99			assertSame(m3, a.get(this));
100	dl	1.10	}
101
102	dl	1.3	/**
103	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
104	dl	1.3	*/
105	jsr166	1.13	public void testCompareAndSet() {
106	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
107	jsr166	1.26	a = updaterFor("x");
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	1.24	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	jsr166	1.26	a = updaterFor("x");
126	dl	1.4
127	jsr166	1.15	Thread t = new Thread(new CheckedRunnable() {
128			public void realRun() {
129			while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
130			Thread.yield();
131			}});
132	jsr166	1.14
133			t.start();
134			assertTrue(a.compareAndSet(this, one, two));
135			t.join(LONG_DELAY_MS);
136			assertFalse(t.isAlive());
137	jsr166	1.25	assertSame(three, a.get(this));
138	dl	1.4	}
139
140			/**
141			* repeated weakCompareAndSet succeeds in changing value when equal
142	jsr166	1.11	* to expected
143	dl	1.3	*/
144	jsr166	1.13	public void testWeakCompareAndSet() {
145	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
146	jsr166	1.26	a = updaterFor("x");
147	dl	1.1	x = one;
148	jsr166	1.24	while (!a.weakCompareAndSet(this, one, two));
149			while (!a.weakCompareAndSet(this, two, m4));
150			assertSame(m4, a.get(this));
151			while (!a.weakCompareAndSet(this, m4, seven));
152			assertSame(seven, a.get(this));
153	dl	1.1	}
154
155	dl	1.3	/**
156	dl	1.4	* getAndSet returns previous value and sets to given value
157	dl	1.3	*/
158	jsr166	1.13	public void testGetAndSet() {
159	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
160	jsr166	1.26	a = updaterFor("x");
161	dl	1.1	x = one;
162	jsr166	1.24	assertSame(one, a.getAndSet(this, zero));
163			assertSame(zero, a.getAndSet(this, m10));
164			assertSame(m10, a.getAndSet(this, 1));
165	dl	1.1	}
166
167			}