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
#	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.AtomicIntegerFieldUpdater;
11
12	public class AtomicIntegerFieldUpdaterTest extends JSR166TestCase {
13	volatile int x = 0;
14	int w;
15	long z;
16	public static void main(String[] args) {
17	junit.textui.TestRunner.run(suite());
18	}
19	public static Test suite() {
20	return new TestSuite(AtomicIntegerFieldUpdaterTest.class);
21	}
22
23	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> updaterFor(String fieldName) {
24	return AtomicIntegerFieldUpdater.newUpdater
25	(AtomicIntegerFieldUpdaterTest.class, fieldName);
26	}
27
28	/**
29	* Construction with non-existent field throws RuntimeException
30	*/
31	public void testConstructor() {
32	try {
33	updaterFor("y");
34	shouldThrow();
35	} catch (RuntimeException success) {
36	assertNotNull(success.getCause());
37	}
38	}
39
40	/**
41	* construction with field not of given type throws IllegalArgumentException
42	*/
43	public void testConstructor2() {
44	try {
45	updaterFor("z");
46	shouldThrow();
47	} catch (IllegalArgumentException success) {}
48	}
49
50	/**
51	* construction with non-volatile field throws IllegalArgumentException
52	*/
53	public void testConstructor3() {
54	try {
55	updaterFor("w");
56	shouldThrow();
57	} catch (IllegalArgumentException success) {}
58	}
59
60	/**
61	* get returns the last value set or assigned
62	*/
63	public void testGetSet() {
64	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
65	a = updaterFor("x");
66	x = 1;
67	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	}
73
74	/**
75	* get returns the last value lazySet by same thread
76	*/
77	public void testGetLazySet() {
78	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
79	a = updaterFor("x");
80	x = 1;
81	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	}
87
88	/**
89	* compareAndSet succeeds in changing value if equal to expected else fails
90	*/
91	public void testCompareAndSet() {
92	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
93	a = updaterFor("x");
94	x = 1;
95	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	}
103
104	/**
105	* compareAndSet in one thread enables another waiting for value
106	* to succeed
107	*/
108	public void testCompareAndSetInMultipleThreads() throws Exception {
109	x = 1;
110	final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
111	a = updaterFor("x");
112
113	Thread t = new Thread(new CheckedRunnable() {
114	public void realRun() {
115	while (!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3))
116	Thread.yield();
117	}});
118
119	t.start();
120	assertTrue(a.compareAndSet(this, 1, 2));
121	t.join(LONG_DELAY_MS);
122	assertFalse(t.isAlive());
123	assertEquals(3, a.get(this));
124	}
125
126	/**
127	* repeated weakCompareAndSet succeeds in changing value when equal
128	* to expected
129	*/
130	public void testWeakCompareAndSet() {
131	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
132	a = updaterFor("x");
133	x = 1;
134	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	}
140
141	/**
142	* getAndSet returns previous value and sets to given value
143	*/
144	public void testGetAndSet() {
145	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
146	a = updaterFor("x");
147	x = 1;
148	assertEquals(1, a.getAndSet(this, 0));
149	assertEquals(0, a.getAndSet(this, -10));
150	assertEquals(-10, a.getAndSet(this, 1));
151	}
152
153	/**
154	* getAndAdd returns previous value and adds given value
155	*/
156	public void testGetAndAdd() {
157	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
158	a = updaterFor("x");
159	x = 1;
160	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	}
165
166	/**
167	* getAndDecrement returns previous value and decrements
168	*/
169	public void testGetAndDecrement() {
170	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
171	a = updaterFor("x");
172	x = 1;
173	assertEquals(1, a.getAndDecrement(this));
174	assertEquals(0, a.getAndDecrement(this));
175	assertEquals(-1, a.getAndDecrement(this));
176	}
177
178	/**
179	* getAndIncrement returns previous value and increments
180	*/
181	public void testGetAndIncrement() {
182	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
183	a = updaterFor("x");
184	x = 1;
185	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	}
193
194	/**
195	* addAndGet adds given value to current, and returns current value
196	*/
197	public void testAddAndGet() {
198	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
199	a = updaterFor("x");
200	x = 1;
201	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	}
206
207	/**
208	* decrementAndGet decrements and returns current value
209	*/
210	public void testDecrementAndGet() {
211	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
212	a = updaterFor("x");
213	x = 1;
214	assertEquals(0, a.decrementAndGet(this));
215	assertEquals(-1, a.decrementAndGet(this));
216	assertEquals(-2, a.decrementAndGet(this));
217	assertEquals(-2, a.get(this));
218	}
219
220	/**
221	* incrementAndGet increments and returns current value
222	*/
223	public void testIncrementAndGet() {
224	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
225	a = updaterFor("x");
226	x = 1;
227	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	}
235
236	}