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/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

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

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);
    }

    AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> updaterFor(String fieldName) {
        return AtomicIntegerFieldUpdater.newUpdater
            (AtomicIntegerFieldUpdaterTest.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 IllegalArgumentException
     */
    public void testConstructor2() {
        try {
            updaterFor("z");
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * construction with non-volatile field throws IllegalArgumentException
     */
    public void testConstructor3() {
        try {
            updaterFor("w");
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * get returns the last value set or assigned
     */
    public void testGetSet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
        a = updaterFor("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));
    }

    /**
     * get returns the last value lazySet by same thread
     */
    public void testGetLazySet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
        a = updaterFor("x");
        x = 1;
        assertEquals(1, a.get(this));
        a.lazySet(this, 2);
        assertEquals(2, a.get(this));
        a.lazySet(this, -3);
        assertEquals(-3, a.get(this));
    }

    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
        a = updaterFor("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));
        assertEquals(-4, 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() throws Exception {
        x = 1;
        final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
        a = updaterFor("x");

        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                while (!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3))
                    Thread.yield();
            }});

        t.start();
        assertTrue(a.compareAndSet(this, 1, 2));
        t.join(LONG_DELAY_MS);
        assertFalse(t.isAlive());
        assertEquals(3, a.get(this));
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
        a = updaterFor("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;
        a = updaterFor("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;
        a = updaterFor("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;
        a = updaterFor("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;
        a = updaterFor("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;
        a = updaterFor("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;
        a = updaterFor("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;
        a = updaterFor("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:	1.26
Committed:	Thu May 30 03:28:55 2013 UTC (10 years, 11 months ago) by jsr166
Branch:	MAIN
Changes since 1.25:	+1 -1 lines
Log Message:	prefer assertNotSame, assertNotNull to assertTrue
#	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	jsr166	1.19	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.10	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9			import junit.framework.*;
10	jsr166	1.21	import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
11	dl	1.1
12	dl	1.2	public class AtomicIntegerFieldUpdaterTest extends JSR166TestCase {
13	dl	1.1	volatile int x = 0;
14	dl	1.4	int w;
15	dl	1.2	long z;
16	jsr166	1.12	public static void main(String[] args) {
17	dl	1.1	junit.textui.TestRunner.run(suite());
18			}
19			public static Test suite() {
20			return new TestSuite(AtomicIntegerFieldUpdaterTest.class);
21			}
22
23	jsr166	1.24	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> updaterFor(String fieldName) {
24			return AtomicIntegerFieldUpdater.newUpdater
25			(AtomicIntegerFieldUpdaterTest.class, fieldName);
26			}
27
28	dl	1.3	/**
29	dl	1.7	* Construction with non-existent field throws RuntimeException
30	dl	1.3	*/
31			public void testConstructor() {
32	jsr166	1.11	try {
33	jsr166	1.24	updaterFor("y");
34	dl	1.3	shouldThrow();
35	jsr166	1.25	} catch (RuntimeException success) {
36	jsr166	1.26	assertNotNull(success.getCause());
37	jsr166	1.25	}
38	dl	1.2	}
39
40	dl	1.3	/**
41	jsr166	1.25	* construction with field not of given type throws IllegalArgumentException
42	dl	1.3	*/
43			public void testConstructor2() {
44	jsr166	1.11	try {
45	jsr166	1.24	updaterFor("z");
46	dl	1.3	shouldThrow();
47	jsr166	1.25	} catch (IllegalArgumentException success) {}
48	dl	1.1	}
49
50	dl	1.3	/**
51	jsr166	1.25	* construction with non-volatile field throws IllegalArgumentException
52	dl	1.4	*/
53			public void testConstructor3() {
54	jsr166	1.11	try {
55	jsr166	1.24	updaterFor("w");
56	dl	1.4	shouldThrow();
57	jsr166	1.25	} catch (IllegalArgumentException success) {}
58	dl	1.4	}
59
60			/**
61	jsr166	1.18	* get returns the last value set or assigned
62	dl	1.3	*/
63			public void testGetSet() {
64	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
65	jsr166	1.24	a = updaterFor("x");
66	dl	1.1	x = 1;
67	jsr166	1.22	assertEquals(1, a.get(this));
68			a.set(this, 2);
69			assertEquals(2, a.get(this));
70			a.set(this, -3);
71			assertEquals(-3, a.get(this));
72	dl	1.1	}
73	dl	1.9
74			/**
75	jsr166	1.18	* get returns the last value lazySet by same thread
76	dl	1.9	*/
77			public void testGetLazySet() {
78			AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
79	jsr166	1.24	a = updaterFor("x");
80	dl	1.9	x = 1;
81	jsr166	1.22	assertEquals(1, a.get(this));
82			a.lazySet(this, 2);
83			assertEquals(2, a.get(this));
84			a.lazySet(this, -3);
85			assertEquals(-3, a.get(this));
86	dl	1.9	}
87
88	dl	1.3	/**
89	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
90	dl	1.3	*/
91			public void testCompareAndSet() {
92	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
93	jsr166	1.24	a = updaterFor("x");
94	dl	1.1	x = 1;
95	jsr166	1.22	assertTrue(a.compareAndSet(this, 1, 2));
96			assertTrue(a.compareAndSet(this, 2, -4));
97			assertEquals(-4, a.get(this));
98			assertFalse(a.compareAndSet(this, -5, 7));
99			assertEquals(-4, a.get(this));
100			assertTrue(a.compareAndSet(this, -4, 7));
101			assertEquals(7, a.get(this));
102	dl	1.1	}
103
104	dl	1.4	/**
105			* compareAndSet in one thread enables another waiting for value
106			* to succeed
107			*/
108	jsr166	1.13	public void testCompareAndSetInMultipleThreads() throws Exception {
109	dl	1.4	x = 1;
110	jsr166	1.24	final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
111			a = updaterFor("x");
112	dl	1.4
113	jsr166	1.14	Thread t = new Thread(new CheckedRunnable() {
114			public void realRun() {
115			while (!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3))
116			Thread.yield();
117			}});
118	jsr166	1.13
119			t.start();
120			assertTrue(a.compareAndSet(this, 1, 2));
121			t.join(LONG_DELAY_MS);
122			assertFalse(t.isAlive());
123	jsr166	1.23	assertEquals(3, a.get(this));
124	dl	1.4	}
125
126	dl	1.3	/**
127	dl	1.4	* repeated weakCompareAndSet succeeds in changing value when equal
128	jsr166	1.10	* to expected
129	dl	1.3	*/
130			public void testWeakCompareAndSet() {
131	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
132	jsr166	1.24	a = updaterFor("x");
133	dl	1.1	x = 1;
134	jsr166	1.22	while (!a.weakCompareAndSet(this, 1, 2));
135			while (!a.weakCompareAndSet(this, 2, -4));
136			assertEquals(-4, a.get(this));
137			while (!a.weakCompareAndSet(this, -4, 7));
138			assertEquals(7, a.get(this));
139	dl	1.1	}
140
141	dl	1.3	/**
142	jsr166	1.18	* getAndSet returns previous value and sets to given value
143	dl	1.3	*/
144			public void testGetAndSet() {
145	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
146	jsr166	1.24	a = updaterFor("x");
147	dl	1.1	x = 1;
148	jsr166	1.22	assertEquals(1, a.getAndSet(this, 0));
149			assertEquals(0, a.getAndSet(this, -10));
150			assertEquals(-10, a.getAndSet(this, 1));
151	dl	1.1	}
152
153	dl	1.3	/**
154	dl	1.4	* getAndAdd returns previous value and adds given value
155	dl	1.3	*/
156			public void testGetAndAdd() {
157	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
158	jsr166	1.24	a = updaterFor("x");
159	dl	1.1	x = 1;
160	jsr166	1.22	assertEquals(1, a.getAndAdd(this, 2));
161			assertEquals(3, a.get(this));
162			assertEquals(3, a.getAndAdd(this, -4));
163			assertEquals(-1, a.get(this));
164	dl	1.1	}
165
166	dl	1.3	/**
167	dl	1.4	* getAndDecrement returns previous value and decrements
168	dl	1.3	*/
169			public void testGetAndDecrement() {
170	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
171	jsr166	1.24	a = updaterFor("x");
172	dl	1.1	x = 1;
173	jsr166	1.22	assertEquals(1, a.getAndDecrement(this));
174			assertEquals(0, a.getAndDecrement(this));
175			assertEquals(-1, a.getAndDecrement(this));
176	dl	1.1	}
177
178	dl	1.3	/**
179	dl	1.4	* getAndIncrement returns previous value and increments
180	dl	1.3	*/
181			public void testGetAndIncrement() {
182	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
183	jsr166	1.24	a = updaterFor("x");
184	dl	1.1	x = 1;
185	jsr166	1.22	assertEquals(1, a.getAndIncrement(this));
186			assertEquals(2, a.get(this));
187			a.set(this, -2);
188			assertEquals(-2, a.getAndIncrement(this));
189			assertEquals(-1, a.getAndIncrement(this));
190			assertEquals(0, a.getAndIncrement(this));
191			assertEquals(1, a.get(this));
192	dl	1.1	}
193
194	dl	1.3	/**
195	dl	1.4	* addAndGet adds given value to current, and returns current value
196	dl	1.3	*/
197			public void testAddAndGet() {
198	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
199	jsr166	1.24	a = updaterFor("x");
200	dl	1.1	x = 1;
201	jsr166	1.22	assertEquals(3, a.addAndGet(this, 2));
202			assertEquals(3, a.get(this));
203			assertEquals(-1, a.addAndGet(this, -4));
204			assertEquals(-1, a.get(this));
205	dl	1.1	}
206
207	dl	1.3	/**
208	dl	1.4	* decrementAndGet decrements and returns current value
209	dl	1.3	*/
210			public void testDecrementAndGet() {
211	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
212	jsr166	1.24	a = updaterFor("x");
213	dl	1.1	x = 1;
214	jsr166	1.22	assertEquals(0, a.decrementAndGet(this));
215			assertEquals(-1, a.decrementAndGet(this));
216			assertEquals(-2, a.decrementAndGet(this));
217			assertEquals(-2, a.get(this));
218	dl	1.1	}
219
220	dl	1.3	/**
221	dl	1.4	* incrementAndGet increments and returns current value
222	dl	1.3	*/
223			public void testIncrementAndGet() {
224	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
225	jsr166	1.24	a = updaterFor("x");
226	dl	1.1	x = 1;
227	jsr166	1.22	assertEquals(2, a.incrementAndGet(this));
228			assertEquals(2, a.get(this));
229			a.set(this, -2);
230			assertEquals(-1, a.incrementAndGet(this));
231			assertEquals(0, a.incrementAndGet(this));
232			assertEquals(1, a.incrementAndGet(this));
233			assertEquals(1, a.get(this));
234	dl	1.1	}
235
236			}