test/tck/AtomicLongFieldUpdaterTest.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.AtomicLongFieldUpdater;

public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
    volatile long x = 0;
    int z;
    long w;

    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicLongFieldUpdaterTest.class);
    }

    AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) {
        return AtomicLongFieldUpdater.newUpdater
            (AtomicLongFieldUpdaterTest.class, fieldName);
    }

    /**
     * Construction with non-existent field throws RuntimeException
     */
    public void testConstructor() {
        try {
            updaterFor("y");
            shouldThrow();
        } catch (RuntimeException success) {
            assertTrue(success.getCause() != null);
        }
    }

    /**
     * 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() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 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() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 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() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 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 AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");

        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                while (!a.compareAndSet(AtomicLongFieldUpdaterTest.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() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 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() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 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() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 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() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 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() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 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() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 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() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 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() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 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:	1.25
Committed:	Tue Apr 2 04:11:28 2013 UTC (11 years, 1 month ago) by jsr166
Branch:	MAIN
Changes since 1.24:	+7 -5 lines
Log Message:	tighten tests to match specs
#	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.AtomicLongFieldUpdater;
11
12	public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
13	volatile long x = 0;
14	int z;
15	long w;
16
17	public static void main(String[] args) {
18	junit.textui.TestRunner.run(suite());
19	}
20	public static Test suite() {
21	return new TestSuite(AtomicLongFieldUpdaterTest.class);
22	}
23
24	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) {
25	return AtomicLongFieldUpdater.newUpdater
26	(AtomicLongFieldUpdaterTest.class, fieldName);
27	}
28
29	/**
30	* Construction with non-existent field throws RuntimeException
31	*/
32	public void testConstructor() {
33	try {
34	updaterFor("y");
35	shouldThrow();
36	} catch (RuntimeException success) {
37	assertTrue(success.getCause() != null);
38	}
39	}
40
41	/**
42	* construction with field not of given type throws IllegalArgumentException
43	*/
44	public void testConstructor2() {
45	try {
46	updaterFor("z");
47	shouldThrow();
48	} catch (IllegalArgumentException success) {}
49	}
50
51	/**
52	* construction with non-volatile field throws IllegalArgumentException
53	*/
54	public void testConstructor3() {
55	try {
56	updaterFor("w");
57	shouldThrow();
58	} catch (IllegalArgumentException success) {}
59	}
60
61	/**
62	* get returns the last value set or assigned
63	*/
64	public void testGetSet() {
65	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
66	a = updaterFor("x");
67	x = 1;
68	assertEquals(1, a.get(this));
69	a.set(this, 2);
70	assertEquals(2, a.get(this));
71	a.set(this, -3);
72	assertEquals(-3, a.get(this));
73	}
74
75	/**
76	* get returns the last value lazySet by same thread
77	*/
78	public void testGetLazySet() {
79	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
80	a = updaterFor("x");
81	x = 1;
82	assertEquals(1, a.get(this));
83	a.lazySet(this, 2);
84	assertEquals(2, a.get(this));
85	a.lazySet(this, -3);
86	assertEquals(-3, a.get(this));
87	}
88
89	/**
90	* compareAndSet succeeds in changing value if equal to expected else fails
91	*/
92	public void testCompareAndSet() {
93	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
94	a = updaterFor("x");
95	x = 1;
96	assertTrue(a.compareAndSet(this, 1, 2));
97	assertTrue(a.compareAndSet(this, 2, -4));
98	assertEquals(-4, a.get(this));
99	assertFalse(a.compareAndSet(this, -5, 7));
100	assertEquals(-4, a.get(this));
101	assertTrue(a.compareAndSet(this, -4, 7));
102	assertEquals(7, a.get(this));
103	}
104
105	/**
106	* compareAndSet in one thread enables another waiting for value
107	* to succeed
108	*/
109	public void testCompareAndSetInMultipleThreads() throws Exception {
110	x = 1;
111	final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
112	a = updaterFor("x");
113
114	Thread t = new Thread(new CheckedRunnable() {
115	public void realRun() {
116	while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3))
117	Thread.yield();
118	}});
119
120	t.start();
121	assertTrue(a.compareAndSet(this, 1, 2));
122	t.join(LONG_DELAY_MS);
123	assertFalse(t.isAlive());
124	assertEquals(3, a.get(this));
125	}
126
127	/**
128	* repeated weakCompareAndSet succeeds in changing value when equal
129	* to expected
130	*/
131	public void testWeakCompareAndSet() {
132	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
133	a = updaterFor("x");
134	x = 1;
135	while (!a.weakCompareAndSet(this, 1, 2));
136	while (!a.weakCompareAndSet(this, 2, -4));
137	assertEquals(-4, a.get(this));
138	while (!a.weakCompareAndSet(this, -4, 7));
139	assertEquals(7, a.get(this));
140	}
141
142	/**
143	* getAndSet returns previous value and sets to given value
144	*/
145	public void testGetAndSet() {
146	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
147	a = updaterFor("x");
148	x = 1;
149	assertEquals(1, a.getAndSet(this, 0));
150	assertEquals(0, a.getAndSet(this, -10));
151	assertEquals(-10, a.getAndSet(this, 1));
152	}
153
154	/**
155	* getAndAdd returns previous value and adds given value
156	*/
157	public void testGetAndAdd() {
158	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
159	a = updaterFor("x");
160	x = 1;
161	assertEquals(1, a.getAndAdd(this, 2));
162	assertEquals(3, a.get(this));
163	assertEquals(3, a.getAndAdd(this, -4));
164	assertEquals(-1, a.get(this));
165	}
166
167	/**
168	* getAndDecrement returns previous value and decrements
169	*/
170	public void testGetAndDecrement() {
171	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
172	a = updaterFor("x");
173	x = 1;
174	assertEquals(1, a.getAndDecrement(this));
175	assertEquals(0, a.getAndDecrement(this));
176	assertEquals(-1, a.getAndDecrement(this));
177	}
178
179	/**
180	* getAndIncrement returns previous value and increments
181	*/
182	public void testGetAndIncrement() {
183	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
184	a = updaterFor("x");
185	x = 1;
186	assertEquals(1, a.getAndIncrement(this));
187	assertEquals(2, a.get(this));
188	a.set(this, -2);
189	assertEquals(-2, a.getAndIncrement(this));
190	assertEquals(-1, a.getAndIncrement(this));
191	assertEquals(0, a.getAndIncrement(this));
192	assertEquals(1, a.get(this));
193	}
194
195	/**
196	* addAndGet adds given value to current, and returns current value
197	*/
198	public void testAddAndGet() {
199	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
200	a = updaterFor("x");
201	x = 1;
202	assertEquals(3, a.addAndGet(this, 2));
203	assertEquals(3, a.get(this));
204	assertEquals(-1, a.addAndGet(this, -4));
205	assertEquals(-1, a.get(this));
206	}
207
208	/**
209	* decrementAndGet decrements and returns current value
210	*/
211	public void testDecrementAndGet() {
212	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
213	a = updaterFor("x");
214	x = 1;
215	assertEquals(0, a.decrementAndGet(this));
216	assertEquals(-1, a.decrementAndGet(this));
217	assertEquals(-2, a.decrementAndGet(this));
218	assertEquals(-2, a.get(this));
219	}
220
221	/**
222	* incrementAndGet increments and returns current value
223	*/
224	public void testIncrementAndGet() {
225	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
226	a = updaterFor("x");
227	x = 1;
228	assertEquals(2, a.incrementAndGet(this));
229	assertEquals(2, a.get(this));
230	a.set(this, -2);
231	assertEquals(-1, a.incrementAndGet(this));
232	assertEquals(0, a.incrementAndGet(this));
233	assertEquals(1, a.incrementAndGet(this));
234	assertEquals(1, a.get(this));
235	}
236
237	}