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 rt) {}
    }


    /**
     * 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 rt) {}
    }

    /**
     * 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 rt) {}
    }

    /**
     *  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;
        assertEquals(one,a.get(this));
        a.set(this,two);
        assertEquals(two,a.get(this));
        a.set(this,m3);
        assertEquals(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;
        assertEquals(one,a.get(this));
        a.lazySet(this,two);
        assertEquals(two,a.get(this));
        a.lazySet(this,m3);
        assertEquals(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));
        assertEquals(m4,a.get(this));
        assertFalse(a.compareAndSet(this,m5,seven));
        assertFalse((seven == a.get(this)));
        assertTrue(a.compareAndSet(this,m4,seven));
        assertEquals(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 Runnable() {
                public void run() {
                    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());
        assertEquals(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));
        assertEquals(m4,a.get(this));
        while (!a.weakCompareAndSet(this,m4,seven));
        assertEquals(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;
        assertEquals(one,a.getAndSet(this, zero));
        assertEquals(zero,a.getAndSet(this,m10));
        assertEquals(m10,a.getAndSet(this,1));
    }

}
Revision:	1.14
Committed:	Tue Nov 17 03:12:51 2009 UTC (14 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.13:	+7 -11 lines
Log Message:	nicer exception handling
#	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			* http://creativecommons.org/licenses/publicdomain
5	jsr166	1.11	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9			import java.util.concurrent.atomic.*;
10			import junit.framework.*;
11			import java.util.*;
12
13	jsr166	1.13	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
14	dl	1.1	volatile Integer x = null;
15			Object z;
16			Integer w;
17
18	jsr166	1.13	public static void main(String[] args) {
19	dl	1.1	junit.textui.TestRunner.run(suite());
20			}
21			public static Test suite() {
22			return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
23			}
24
25	dl	1.3	/**
26	dl	1.7	* Construction with non-existent field throws RuntimeException
27	dl	1.3	*/
28	jsr166	1.13	public void testConstructor() {
29	jsr166	1.12	try {
30	dl	1.1	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
31			a = AtomicReferenceFieldUpdater.newUpdater
32	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "y");
33	dl	1.3	shouldThrow();
34	dl	1.1	}
35			catch (RuntimeException rt) {}
36			}
37
38
39	dl	1.3	/**
40	dl	1.4	* construction with field not of given type throws RuntimeException
41	dl	1.3	*/
42	jsr166	1.13	public void testConstructor2() {
43	jsr166	1.12	try {
44	dl	1.1	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
45			a = AtomicReferenceFieldUpdater.newUpdater
46	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "z");
47	dl	1.3	shouldThrow();
48	dl	1.1	}
49			catch (RuntimeException rt) {}
50			}
51
52	dl	1.3	/**
53	dl	1.4	* Constructor with non-volatile field throws exception
54	dl	1.3	*/
55	jsr166	1.13	public void testConstructor3() {
56	jsr166	1.12	try {
57	dl	1.1	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
58			a = AtomicReferenceFieldUpdater.newUpdater
59	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
60	dl	1.3	shouldThrow();
61	dl	1.1	}
62			catch (RuntimeException rt) {}
63			}
64
65	dl	1.3	/**
66	dl	1.4	* get returns the last value set or assigned
67	dl	1.3	*/
68	jsr166	1.13	public void testGetSet() {
69	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
70			try {
71			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
72			} catch (RuntimeException ok) {
73			return;
74			}
75	dl	1.1	x = one;
76			assertEquals(one,a.get(this));
77			a.set(this,two);
78			assertEquals(two,a.get(this));
79	dl	1.9	a.set(this,m3);
80			assertEquals(m3,a.get(this));
81	dl	1.1	}
82	dl	1.10
83			/**
84			* get returns the last value lazySet by same thread
85			*/
86	jsr166	1.13	public void testGetLazySet() {
87	dl	1.10	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
88			try {
89			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
90			} catch (RuntimeException ok) {
91			return;
92			}
93			x = one;
94			assertEquals(one,a.get(this));
95			a.lazySet(this,two);
96			assertEquals(two,a.get(this));
97			a.lazySet(this,m3);
98			assertEquals(m3,a.get(this));
99			}
100
101	dl	1.3	/**
102	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
103	dl	1.3	*/
104	jsr166	1.13	public void testCompareAndSet() {
105	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
106			try {
107			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
108			} catch (RuntimeException ok) {
109			return;
110			}
111	dl	1.1	x = one;
112			assertTrue(a.compareAndSet(this,one,two));
113			assertTrue(a.compareAndSet(this,two,m4));
114			assertEquals(m4,a.get(this));
115			assertFalse(a.compareAndSet(this,m5,seven));
116			assertFalse((seven == a.get(this)));
117			assertTrue(a.compareAndSet(this,m4,seven));
118			assertEquals(seven,a.get(this));
119			}
120
121	dl	1.3	/**
122	dl	1.4	* compareAndSet in one thread enables another waiting for value
123			* to succeed
124			*/
125	jsr166	1.14	public void testCompareAndSetInMultipleThreads() throws Exception {
126	dl	1.4	x = one;
127	dl	1.8	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
128			try {
129			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
130			} catch (RuntimeException ok) {
131			return;
132			}
133	dl	1.4
134			Thread t = new Thread(new Runnable() {
135			public void run() {
136	jsr166	1.12	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three)) Thread.yield();
137	dl	1.4	}});
138	jsr166	1.14
139			t.start();
140			assertTrue(a.compareAndSet(this, one, two));
141			t.join(LONG_DELAY_MS);
142			assertFalse(t.isAlive());
143			assertEquals(a.get(this), three);
144	dl	1.4	}
145
146			/**
147			* repeated weakCompareAndSet succeeds in changing value when equal
148	jsr166	1.11	* to expected
149	dl	1.3	*/
150	jsr166	1.13	public void testWeakCompareAndSet() {
151	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
152			try {
153			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
154			} catch (RuntimeException ok) {
155			return;
156			}
157	dl	1.1	x = one;
158	jsr166	1.12	while (!a.weakCompareAndSet(this,one,two));
159			while (!a.weakCompareAndSet(this,two,m4));
160	dl	1.1	assertEquals(m4,a.get(this));
161	jsr166	1.12	while (!a.weakCompareAndSet(this,m4,seven));
162	dl	1.1	assertEquals(seven,a.get(this));
163			}
164
165	dl	1.3	/**
166	dl	1.4	* getAndSet returns previous value and sets to given value
167	dl	1.3	*/
168	jsr166	1.13	public void testGetAndSet() {
169	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
170			try {
171			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
172			} catch (RuntimeException ok) {
173			return;
174			}
175	dl	1.1	x = one;
176			assertEquals(one,a.getAndSet(this, zero));
177			assertEquals(zero,a.getAndSet(this,m10));
178			assertEquals(m10,a.getAndSet(this,1));
179			}
180
181			}