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;
        do {} while (!a.weakCompareAndSet(this, one, two));
        do {} while (!a.weakCompareAndSet(this, two, m4));
        assertSame(m4, a.get(this));
        do {} 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:	1.31
Committed:	Wed Dec 31 19:21:20 2014 UTC (9 years, 4 months ago) by jsr166
Branch:	MAIN
Changes since 1.30:	+3 -3 lines
Log Message:	prefer do {} while (...); to while (...);
#	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.AtomicReferenceFieldUpdater;
10
11	import junit.framework.Test;
12	import junit.framework.TestSuite;
13
14	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
15	volatile Integer x = null;
16	Object z;
17	Integer w;
18	volatile int i;
19
20	public static void main(String[] args) {
21	junit.textui.TestRunner.run(suite());
22	}
23	public static Test suite() {
24	return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
25	}
26
27	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
28	return AtomicReferenceFieldUpdater.newUpdater
29	(AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName);
30	}
31
32	/**
33	* Construction with non-existent field throws RuntimeException
34	*/
35	public void testConstructor() {
36	try {
37	updaterFor("y");
38	shouldThrow();
39	} catch (RuntimeException success) {
40	assertNotNull(success.getCause());
41	}
42	}
43
44	/**
45	* construction with field not of given type throws ClassCastException
46	*/
47	public void testConstructor2() {
48	try {
49	updaterFor("z");
50	shouldThrow();
51	} catch (ClassCastException success) {}
52	}
53
54	/**
55	* Constructor with non-volatile field throws IllegalArgumentException
56	*/
57	public void testConstructor3() {
58	try {
59	updaterFor("w");
60	shouldThrow();
61	} catch (IllegalArgumentException success) {}
62	}
63
64	/**
65	* 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	* get returns the last value set or assigned
76	*/
77	public void testGetSet() {
78	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
79	a = updaterFor("x");
80	x = one;
81	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	}
87
88	/**
89	* get returns the last value lazySet by same thread
90	*/
91	public void testGetLazySet() {
92	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
93	a = updaterFor("x");
94	x = one;
95	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	}
101
102	/**
103	* compareAndSet succeeds in changing value if equal to expected else fails
104	*/
105	public void testCompareAndSet() {
106	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
107	a = updaterFor("x");
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	a = updaterFor("x");
126
127	Thread t = new Thread(new CheckedRunnable() {
128	public void realRun() {
129	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
130	Thread.yield();
131	}});
132
133	t.start();
134	assertTrue(a.compareAndSet(this, one, two));
135	t.join(LONG_DELAY_MS);
136	assertFalse(t.isAlive());
137	assertSame(three, a.get(this));
138	}
139
140	/**
141	* repeated weakCompareAndSet succeeds in changing value when equal
142	* to expected
143	*/
144	public void testWeakCompareAndSet() {
145	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
146	a = updaterFor("x");
147	x = one;
148	do {} while (!a.weakCompareAndSet(this, one, two));
149	do {} while (!a.weakCompareAndSet(this, two, m4));
150	assertSame(m4, a.get(this));
151	do {} while (!a.weakCompareAndSet(this, m4, seven));
152	assertSame(seven, a.get(this));
153	}
154
155	/**
156	* getAndSet returns previous value and sets to given value
157	*/
158	public void testGetAndSet() {
159	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
160	a = updaterFor("x");
161	x = one;
162	assertSame(one, a.getAndSet(this, zero));
163	assertSame(zero, a.getAndSet(this, m10));
164	assertSame(m10, a.getAndSet(this, 1));
165	}
166
167	}