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 junit.framework.*;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;

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);
    }

    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) {}
    }

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

    /**
     * Constructor with non-volatile field throws exception
     */
    public void testConstructor3() {
        try {
            updaterFor("w");
            shouldThrow();
        } catch (RuntimeException 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:	1.26
Committed:	Mon Apr 1 20:58:58 2013 UTC (11 years, 1 month ago) by jsr166
Branch:	MAIN
Changes since 1.25:	+14 -39 lines
Log Message:	RuntimeException is not ok for valid fields; refactor a little
#	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 junit.framework.*;
10	import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
11
12	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
13	volatile Integer x = null;
14	Object z;
15	Integer w;
16
17	public static void main(String[] args) {
18	junit.textui.TestRunner.run(suite());
19	}
20	public static Test suite() {
21	return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
22	}
23
24	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
25	return AtomicReferenceFieldUpdater.newUpdater
26	(AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName);
27	}
28
29	/**
30	* Construction with non-existent field throws RuntimeException
31	*/
32	public void testConstructor() {
33	try {
34	updaterFor("y");
35	shouldThrow();
36	} catch (RuntimeException success) {}
37	}
38
39	/**
40	* construction with field not of given type throws RuntimeException
41	*/
42	public void testConstructor2() {
43	try {
44	updaterFor("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	updaterFor("w");
55	shouldThrow();
56	} catch (RuntimeException success) {}
57	}
58
59	/**
60	* get returns the last value set or assigned
61	*/
62	public void testGetSet() {
63	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
64	a = updaterFor("x");
65	x = one;
66	assertSame(one, a.get(this));
67	a.set(this, two);
68	assertSame(two, a.get(this));
69	a.set(this, m3);
70	assertSame(m3, a.get(this));
71	}
72
73	/**
74	* get returns the last value lazySet by same thread
75	*/
76	public void testGetLazySet() {
77	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
78	a = updaterFor("x");
79	x = one;
80	assertSame(one, a.get(this));
81	a.lazySet(this, two);
82	assertSame(two, a.get(this));
83	a.lazySet(this, m3);
84	assertSame(m3, a.get(this));
85	}
86
87	/**
88	* compareAndSet succeeds in changing value if equal to expected else fails
89	*/
90	public void testCompareAndSet() {
91	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
92	a = updaterFor("x");
93	x = one;
94	assertTrue(a.compareAndSet(this, one, two));
95	assertTrue(a.compareAndSet(this, two, m4));
96	assertSame(m4, a.get(this));
97	assertFalse(a.compareAndSet(this, m5, seven));
98	assertFalse(seven == a.get(this));
99	assertTrue(a.compareAndSet(this, m4, seven));
100	assertSame(seven, a.get(this));
101	}
102
103	/**
104	* compareAndSet in one thread enables another waiting for value
105	* to succeed
106	*/
107	public void testCompareAndSetInMultipleThreads() throws Exception {
108	x = one;
109	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
110	a = updaterFor("x");
111
112	Thread t = new Thread(new CheckedRunnable() {
113	public void realRun() {
114	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
115	Thread.yield();
116	}});
117
118	t.start();
119	assertTrue(a.compareAndSet(this, one, two));
120	t.join(LONG_DELAY_MS);
121	assertFalse(t.isAlive());
122	assertSame(three, a.get(this));
123	}
124
125	/**
126	* repeated weakCompareAndSet succeeds in changing value when equal
127	* to expected
128	*/
129	public void testWeakCompareAndSet() {
130	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
131	a = updaterFor("x");
132	x = one;
133	while (!a.weakCompareAndSet(this, one, two));
134	while (!a.weakCompareAndSet(this, two, m4));
135	assertSame(m4, a.get(this));
136	while (!a.weakCompareAndSet(this, m4, seven));
137	assertSame(seven, a.get(this));
138	}
139
140	/**
141	* getAndSet returns previous value and sets to given value
142	*/
143	public void testGetAndSet() {
144	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
145	a = updaterFor("x");
146	x = one;
147	assertSame(one, a.getAndSet(this, zero));
148	assertSame(zero, a.getAndSet(this, m10));
149	assertSame(m10, a.getAndSet(this, 1));
150	}
151
152	}