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() {
        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();
                }});
        try {
            t.start();
            assertTrue(a.compareAndSet(this, one, two));
            t.join(LONG_DELAY_MS);
            assertFalse(t.isAlive());
            assertEquals(a.get(this), three);
        }
        catch (Exception e) {
            unexpectedException();
        }
    }

    /**
     * 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:	1.12
Committed:	Mon Nov 16 04:57:10 2009 UTC (14 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.11:	+8 -8 lines
Log Message:	whitespace
#	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	dl	1.2	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase{
14	dl	1.1	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	dl	1.3	/**
26	dl	1.7	* Construction with non-existent field throws RuntimeException
27	dl	1.3	*/
28	dl	1.1	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	dl	1.1	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	dl	1.1	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	dl	1.1	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			public void testGetLazySet(){
87			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	dl	1.1	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			public void testCompareAndSetInMultipleThreads() {
126			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			try {
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			}
145	jsr166	1.12	catch (Exception e) {
146	dl	1.4	unexpectedException();
147			}
148			}
149
150			/**
151			* repeated weakCompareAndSet succeeds in changing value when equal
152	jsr166	1.11	* to expected
153	dl	1.3	*/
154	dl	1.1	public void testWeakCompareAndSet(){
155	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
156			try {
157			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
158			} catch (RuntimeException ok) {
159			return;
160			}
161	dl	1.1	x = one;
162	jsr166	1.12	while (!a.weakCompareAndSet(this,one,two));
163			while (!a.weakCompareAndSet(this,two,m4));
164	dl	1.1	assertEquals(m4,a.get(this));
165	jsr166	1.12	while (!a.weakCompareAndSet(this,m4,seven));
166	dl	1.1	assertEquals(seven,a.get(this));
167			}
168
169	dl	1.3	/**
170	dl	1.4	* getAndSet returns previous value and sets to given value
171	dl	1.3	*/
172	dl	1.1	public void testGetAndSet(){
173	dl	1.8	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
174			try {
175			a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
176			} catch (RuntimeException ok) {
177			return;
178			}
179	dl	1.1	x = one;
180			assertEquals(one,a.getAndSet(this, zero));
181			assertEquals(zero,a.getAndSet(this,m10));
182			assertEquals(m10,a.getAndSet(this,1));
183			}
184
185			}