test/tck/AtomicIntegerFieldUpdaterTest.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 AtomicIntegerFieldUpdaterTest extends JSR166TestCase {
    volatile int x = 0;
    int w;
    long z;
    public static void main(String[] args){
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicIntegerFieldUpdaterTest.class);
    }

    /**
     * Construction with non-existent field throws RuntimeException
     */
    public void testConstructor() {
        try{
            AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 
                a = AtomicIntegerFieldUpdater.newUpdater
                (AtomicIntegerFieldUpdaterTest.class, "y");
            shouldThrow();
        }
        catch (RuntimeException rt) {}
    }

    /**
     * construction with field not of given type throws RuntimeException
     */
    public void testConstructor2() {
        try{
            AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 
                a = AtomicIntegerFieldUpdater.newUpdater
                (AtomicIntegerFieldUpdaterTest.class, "z");
            shouldThrow();
        }
        catch (RuntimeException rt) {}
    }

    /**
     * construction with non-volatile field throws RuntimeException
     */
    public void testConstructor3() {
        try{
            AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 
                a = AtomicIntegerFieldUpdater.newUpdater
                (AtomicIntegerFieldUpdaterTest.class, "w");
            shouldThrow();
        }
        catch (RuntimeException rt) {}
    }

    /**
     *  get returns the last value set or assigned
     */
    public void testGetSet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.get(this));
        a.set(this,2);
        assertEquals(2,a.get(this));
        a.set(this,-3);
        assertEquals(-3,a.get(this));
        
    }
    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        x = 1;
        assertTrue(a.compareAndSet(this,1,2));
        assertTrue(a.compareAndSet(this,2,-4));
        assertEquals(-4,a.get(this));
        assertFalse(a.compareAndSet(this,-5,7));
        assertFalse((7 == a.get(this)));
        assertTrue(a.compareAndSet(this,-4,7));
        assertEquals(7,a.get(this));
    }


    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() {
        x = 1;
        final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");

        Thread t = new Thread(new Runnable() {
                public void run() {
                    while(!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3)) Thread.yield();
                }});
        try {
            t.start();
            assertTrue(a.compareAndSet(this, 1, 2));
            t.join(LONG_DELAY_MS);
            assertFalse(t.isAlive());
            assertEquals(a.get(this), 3);
        }
        catch(Exception e) {
            unexpectedException();
        }
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected 
     */
    public void testWeakCompareAndSet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        x = 1;
        while(!a.weakCompareAndSet(this,1,2));
        while(!a.weakCompareAndSet(this,2,-4));
        assertEquals(-4,a.get(this));
        while(!a.weakCompareAndSet(this,-4,7));
        assertEquals(7,a.get(this));
    }

    /**
     *  getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndSet(this, 0));
        assertEquals(0,a.getAndSet(this,-10));
        assertEquals(-10,a.getAndSet(this,1));
    }

    /**
     * getAndAdd returns previous value and adds given value
     */
    public void testGetAndAdd() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndAdd(this,2));
        assertEquals(3,a.get(this));
        assertEquals(3,a.getAndAdd(this,-4));
        assertEquals(-1,a.get(this));
    }

    /**
     * getAndDecrement returns previous value and decrements
     */
    public void testGetAndDecrement() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndDecrement(this));
        assertEquals(0,a.getAndDecrement(this));
        assertEquals(-1,a.getAndDecrement(this));
    }

    /**
     * getAndIncrement returns previous value and increments
     */
    public void testGetAndIncrement() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndIncrement(this));
        assertEquals(2,a.get(this));
        a.set(this,-2);
        assertEquals(-2,a.getAndIncrement(this));
        assertEquals(-1,a.getAndIncrement(this));
        assertEquals(0,a.getAndIncrement(this));
        assertEquals(1,a.get(this));
    }

    /**
     * addAndGet adds given value to current, and returns current value
     */
    public void testAddAndGet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(3,a.addAndGet(this,2));
        assertEquals(3,a.get(this));
        assertEquals(-1,a.addAndGet(this,-4));
        assertEquals(-1,a.get(this));
    }

    /**
     * decrementAndGet decrements and returns current value
     */
    public void testDecrementAndGet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(0,a.decrementAndGet(this));
        assertEquals(-1,a.decrementAndGet(this));
        assertEquals(-2,a.decrementAndGet(this));
        assertEquals(-2,a.get(this));
    }

    /**
     * incrementAndGet increments and returns current value
     */
    public void testIncrementAndGet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(2,a.incrementAndGet(this));
        assertEquals(2,a.get(this));
        a.set(this,-2);
        assertEquals(-1,a.incrementAndGet(this));
        assertEquals(0,a.incrementAndGet(this));
        assertEquals(1,a.incrementAndGet(this));
        assertEquals(1,a.get(this));
    }

}
Revision:	1.7
Committed:	Mon Dec 29 19:05:40 2003 UTC (20 years, 4 months ago) by dl
Branch:	MAIN
Changes since 1.6:	+1 -1 lines
Log Message:	spellcheck
#	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			* 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 AtomicIntegerFieldUpdaterTest extends JSR166TestCase {
14	dl	1.1	volatile int x = 0;
15	dl	1.4	int w;
16	dl	1.2	long z;
17	dl	1.1	public static void main(String[] args){
18			junit.textui.TestRunner.run(suite());
19			}
20			public static Test suite() {
21			return new TestSuite(AtomicIntegerFieldUpdaterTest.class);
22			}
23
24	dl	1.3	/**
25	dl	1.7	* Construction with non-existent field throws RuntimeException
26	dl	1.3	*/
27			public void testConstructor() {
28	dl	1.1	try{
29			AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
30			a = AtomicIntegerFieldUpdater.newUpdater
31	dl	1.5	(AtomicIntegerFieldUpdaterTest.class, "y");
32	dl	1.3	shouldThrow();
33	dl	1.2	}
34			catch (RuntimeException rt) {}
35			}
36
37	dl	1.3	/**
38	dl	1.4	* construction with field not of given type throws RuntimeException
39	dl	1.3	*/
40			public void testConstructor2() {
41	dl	1.2	try{
42			AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
43			a = AtomicIntegerFieldUpdater.newUpdater
44	dl	1.5	(AtomicIntegerFieldUpdaterTest.class, "z");
45	dl	1.3	shouldThrow();
46	dl	1.1	}
47			catch (RuntimeException rt) {}
48			}
49
50	dl	1.3	/**
51	dl	1.4	* construction with non-volatile field throws RuntimeException
52			*/
53			public void testConstructor3() {
54			try{
55			AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
56			a = AtomicIntegerFieldUpdater.newUpdater
57	dl	1.5	(AtomicIntegerFieldUpdaterTest.class, "w");
58	dl	1.4	shouldThrow();
59			}
60			catch (RuntimeException rt) {}
61			}
62
63			/**
64			* get returns the last value set or assigned
65	dl	1.3	*/
66			public void testGetSet() {
67	dl	1.5	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
68	dl	1.1	x = 1;
69			assertEquals(1,a.get(this));
70			a.set(this,2);
71			assertEquals(2,a.get(this));
72			a.set(this,-3);
73			assertEquals(-3,a.get(this));
74
75			}
76	dl	1.3	/**
77	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
78	dl	1.3	*/
79			public void testCompareAndSet() {
80	dl	1.5	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
81	dl	1.1	x = 1;
82			assertTrue(a.compareAndSet(this,1,2));
83			assertTrue(a.compareAndSet(this,2,-4));
84			assertEquals(-4,a.get(this));
85			assertFalse(a.compareAndSet(this,-5,7));
86			assertFalse((7 == a.get(this)));
87			assertTrue(a.compareAndSet(this,-4,7));
88			assertEquals(7,a.get(this));
89			}
90
91	dl	1.4
92			/**
93			* compareAndSet in one thread enables another waiting for value
94			* to succeed
95			*/
96			public void testCompareAndSetInMultipleThreads() {
97			x = 1;
98	dl	1.5	final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
99	dl	1.4
100			Thread t = new Thread(new Runnable() {
101			public void run() {
102			while(!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3)) Thread.yield();
103			}});
104			try {
105			t.start();
106			assertTrue(a.compareAndSet(this, 1, 2));
107			t.join(LONG_DELAY_MS);
108			assertFalse(t.isAlive());
109			assertEquals(a.get(this), 3);
110			}
111			catch(Exception e) {
112			unexpectedException();
113			}
114			}
115
116	dl	1.3	/**
117	dl	1.4	* repeated weakCompareAndSet succeeds in changing value when equal
118			* to expected
119	dl	1.3	*/
120			public void testWeakCompareAndSet() {
121	dl	1.5	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
122	dl	1.1	x = 1;
123			while(!a.weakCompareAndSet(this,1,2));
124			while(!a.weakCompareAndSet(this,2,-4));
125			assertEquals(-4,a.get(this));
126			while(!a.weakCompareAndSet(this,-4,7));
127			assertEquals(7,a.get(this));
128			}
129
130	dl	1.3	/**
131	dl	1.4	* getAndSet returns previous value and sets to given value
132	dl	1.3	*/
133			public void testGetAndSet() {
134	dl	1.5	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
135	dl	1.1	x = 1;
136			assertEquals(1,a.getAndSet(this, 0));
137			assertEquals(0,a.getAndSet(this,-10));
138			assertEquals(-10,a.getAndSet(this,1));
139			}
140
141	dl	1.3	/**
142	dl	1.4	* getAndAdd returns previous value and adds given value
143	dl	1.3	*/
144			public void testGetAndAdd() {
145	dl	1.5	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
146	dl	1.1	x = 1;
147			assertEquals(1,a.getAndAdd(this,2));
148			assertEquals(3,a.get(this));
149			assertEquals(3,a.getAndAdd(this,-4));
150			assertEquals(-1,a.get(this));
151			}
152
153	dl	1.3	/**
154	dl	1.4	* getAndDecrement returns previous value and decrements
155	dl	1.3	*/
156			public void testGetAndDecrement() {
157	dl	1.5	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
158	dl	1.1	x = 1;
159			assertEquals(1,a.getAndDecrement(this));
160			assertEquals(0,a.getAndDecrement(this));
161			assertEquals(-1,a.getAndDecrement(this));
162			}
163
164	dl	1.3	/**
165	dl	1.4	* getAndIncrement returns previous value and increments
166	dl	1.3	*/
167			public void testGetAndIncrement() {
168	dl	1.5	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
169	dl	1.1	x = 1;
170			assertEquals(1,a.getAndIncrement(this));
171			assertEquals(2,a.get(this));
172			a.set(this,-2);
173			assertEquals(-2,a.getAndIncrement(this));
174			assertEquals(-1,a.getAndIncrement(this));
175			assertEquals(0,a.getAndIncrement(this));
176			assertEquals(1,a.get(this));
177			}
178
179	dl	1.3	/**
180	dl	1.4	* addAndGet adds given value to current, and returns current value
181	dl	1.3	*/
182			public void testAddAndGet() {
183	dl	1.5	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
184	dl	1.1	x = 1;
185			assertEquals(3,a.addAndGet(this,2));
186			assertEquals(3,a.get(this));
187			assertEquals(-1,a.addAndGet(this,-4));
188			assertEquals(-1,a.get(this));
189			}
190
191	dl	1.3	/**
192	dl	1.4	* decrementAndGet decrements and returns current value
193	dl	1.3	*/
194			public void testDecrementAndGet() {
195	dl	1.5	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
196	dl	1.1	x = 1;
197			assertEquals(0,a.decrementAndGet(this));
198			assertEquals(-1,a.decrementAndGet(this));
199			assertEquals(-2,a.decrementAndGet(this));
200			assertEquals(-2,a.get(this));
201			}
202
203	dl	1.3	/**
204	dl	1.4	* incrementAndGet increments and returns current value
205	dl	1.3	*/
206			public void testIncrementAndGet() {
207	dl	1.5	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
208	dl	1.1	x = 1;
209			assertEquals(2,a.incrementAndGet(this));
210			assertEquals(2,a.get(this));
211			a.set(this,-2);
212			assertEquals(-1,a.incrementAndGet(this));
213			assertEquals(0,a.incrementAndGet(this));
214			assertEquals(1,a.incrementAndGet(this));
215			assertEquals(1,a.get(this));
216			}
217
218			}