test/tck/AtomicLongTest.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.AtomicLong;

public class AtomicLongTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicLongTest.class);
    }

    final long[] VALUES = {
        Long.MIN_VALUE,
        Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE,
        Long.MAX_VALUE,
    };

    /**
     * constructor initializes to given value
     */
    public void testConstructor() {
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.get());
    }

    /**
     * default constructed initializes to zero
     */
    public void testConstructor2() {
        AtomicLong ai = new AtomicLong();
        assertEquals(0,ai.get());
    }

    /**
     * get returns the last value set
     */
    public void testGetSet() {
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.get());
        ai.set(2);
        assertEquals(2,ai.get());
        ai.set(-3);
        assertEquals(-3,ai.get());
    }

    /**
     * get returns the last value lazySet in same thread
     */
    public void testGetLazySet() {
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.get());
        ai.lazySet(2);
        assertEquals(2,ai.get());
        ai.lazySet(-3);
        assertEquals(-3,ai.get());
    }

    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicLong ai = new AtomicLong(1);
        assertTrue(ai.compareAndSet(1,2));
        assertTrue(ai.compareAndSet(2,-4));
        assertEquals(-4,ai.get());
        assertFalse(ai.compareAndSet(-5,7));
        assertEquals(-4,ai.get());
        assertTrue(ai.compareAndSet(-4,7));
        assertEquals(7,ai.get());
    }

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() throws Exception {
        final AtomicLong ai = new AtomicLong(1);
        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                while (!ai.compareAndSet(2, 3))
                    Thread.yield();
            }});

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

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSet() {
        AtomicLong ai = new AtomicLong(1);
        while (!ai.weakCompareAndSet(1,2));
        while (!ai.weakCompareAndSet(2,-4));
        assertEquals(-4,ai.get());
        while (!ai.weakCompareAndSet(-4,7));
        assertEquals(7,ai.get());
    }

    /**
     * getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet() {
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.getAndSet(0));
        assertEquals(0,ai.getAndSet(-10));
        assertEquals(-10,ai.getAndSet(1));
    }

    /**
     * getAndAdd returns previous value and adds given value
     */
    public void testGetAndAdd() {
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.getAndAdd(2));
        assertEquals(3,ai.get());
        assertEquals(3,ai.getAndAdd(-4));
        assertEquals(-1,ai.get());
    }

    /**
     * getAndDecrement returns previous value and decrements
     */
    public void testGetAndDecrement() {
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.getAndDecrement());
        assertEquals(0,ai.getAndDecrement());
        assertEquals(-1,ai.getAndDecrement());
    }

    /**
     * getAndIncrement returns previous value and increments
     */
    public void testGetAndIncrement() {
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.getAndIncrement());
        assertEquals(2,ai.get());
        ai.set(-2);
        assertEquals(-2,ai.getAndIncrement());
        assertEquals(-1,ai.getAndIncrement());
        assertEquals(0,ai.getAndIncrement());
        assertEquals(1,ai.get());
    }

    /**
     * addAndGet adds given value to current, and returns current value
     */
    public void testAddAndGet() {
        AtomicLong ai = new AtomicLong(1);
        assertEquals(3,ai.addAndGet(2));
        assertEquals(3,ai.get());
        assertEquals(-1,ai.addAndGet(-4));
        assertEquals(-1,ai.get());
    }

    /**
     * decrementAndGet decrements and returns current value
     */
    public void testDecrementAndGet() {
        AtomicLong ai = new AtomicLong(1);
        assertEquals(0,ai.decrementAndGet());
        assertEquals(-1,ai.decrementAndGet());
        assertEquals(-2,ai.decrementAndGet());
        assertEquals(-2,ai.get());
    }

    /**
     * incrementAndGet increments and returns current value
     */
    public void testIncrementAndGet() {
        AtomicLong ai = new AtomicLong(1);
        assertEquals(2,ai.incrementAndGet());
        assertEquals(2,ai.get());
        ai.set(-2);
        assertEquals(-1,ai.incrementAndGet());
        assertEquals(0,ai.incrementAndGet());
        assertEquals(1,ai.incrementAndGet());
        assertEquals(1,ai.get());
    }

    /**
     * a deserialized serialized atomic holds same value
     */
    public void testSerialization() throws Exception {
        AtomicLong x = new AtomicLong();
        AtomicLong y = serialClone(x);
        assertTrue(x != y);
        x.set(-22);
        AtomicLong z = serialClone(x);
        assertEquals(-22, x.get());
        assertEquals(0, y.get());
        assertEquals(-22, z.get());
    }

    /**
     * toString returns current value.
     */
    public void testToString() {
        AtomicLong ai = new AtomicLong();
        assertEquals("0", ai.toString());
        for (long i : VALUES) {
            ai.set(i);
            assertEquals(ai.toString(), Long.toString(i));
        }
    }

    /**
     * intValue returns current value.
     */
    public void testIntValue() {
        AtomicLong ai = new AtomicLong();
        assertEquals(0, ai.intValue());
        for (long x : VALUES) {
            ai.set(x);
            assertEquals((int)x, ai.intValue());
        }
    }

    /**
     * longValue returns current value.
     */
    public void testLongValue() {
        AtomicLong ai = new AtomicLong();
        assertEquals(0L, ai.longValue());
        for (long x : VALUES) {
            ai.set(x);
            assertEquals(x, ai.longValue());
        }
    }

    /**
     * floatValue returns current value.
     */
    public void testFloatValue() {
        AtomicLong ai = new AtomicLong();
        assertEquals(0.0f, ai.floatValue());
        for (long x : VALUES) {
            ai.set(x);
            assertEquals((float)x, ai.floatValue());
        }
    }

    /**
     * doubleValue returns current value.
     */
    public void testDoubleValue() {
        AtomicLong ai = new AtomicLong();
        assertEquals(0.0d, ai.doubleValue());
        for (long x : VALUES) {
            ai.set(x);
            assertEquals((double)x, ai.doubleValue());
        }
    }

}
Revision:	1.22
Committed:	Tue May 31 16:16:23 2011 UTC (12 years, 11 months ago) by jsr166
Branch:	MAIN
Changes since 1.21:	+9 -14 lines
Log Message:	use serialClone in serialization tests; update imports
#	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.AtomicLong;
11
12	public class AtomicLongTest extends JSR166TestCase {
13	public static void main(String[] args) {
14	junit.textui.TestRunner.run(suite());
15	}
16	public static Test suite() {
17	return new TestSuite(AtomicLongTest.class);
18	}
19
20	final long[] VALUES = {
21	Long.MIN_VALUE,
22	Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE,
23	Long.MAX_VALUE,
24	};
25
26	/**
27	* constructor initializes to given value
28	*/
29	public void testConstructor() {
30	AtomicLong ai = new AtomicLong(1);
31	assertEquals(1,ai.get());
32	}
33
34	/**
35	* default constructed initializes to zero
36	*/
37	public void testConstructor2() {
38	AtomicLong ai = new AtomicLong();
39	assertEquals(0,ai.get());
40	}
41
42	/**
43	* get returns the last value set
44	*/
45	public void testGetSet() {
46	AtomicLong ai = new AtomicLong(1);
47	assertEquals(1,ai.get());
48	ai.set(2);
49	assertEquals(2,ai.get());
50	ai.set(-3);
51	assertEquals(-3,ai.get());
52	}
53
54	/**
55	* get returns the last value lazySet in same thread
56	*/
57	public void testGetLazySet() {
58	AtomicLong ai = new AtomicLong(1);
59	assertEquals(1,ai.get());
60	ai.lazySet(2);
61	assertEquals(2,ai.get());
62	ai.lazySet(-3);
63	assertEquals(-3,ai.get());
64	}
65
66	/**
67	* compareAndSet succeeds in changing value if equal to expected else fails
68	*/
69	public void testCompareAndSet() {
70	AtomicLong ai = new AtomicLong(1);
71	assertTrue(ai.compareAndSet(1,2));
72	assertTrue(ai.compareAndSet(2,-4));
73	assertEquals(-4,ai.get());
74	assertFalse(ai.compareAndSet(-5,7));
75	assertEquals(-4,ai.get());
76	assertTrue(ai.compareAndSet(-4,7));
77	assertEquals(7,ai.get());
78	}
79
80	/**
81	* compareAndSet in one thread enables another waiting for value
82	* to succeed
83	*/
84	public void testCompareAndSetInMultipleThreads() throws Exception {
85	final AtomicLong ai = new AtomicLong(1);
86	Thread t = new Thread(new CheckedRunnable() {
87	public void realRun() {
88	while (!ai.compareAndSet(2, 3))
89	Thread.yield();
90	}});
91
92	t.start();
93	assertTrue(ai.compareAndSet(1, 2));
94	t.join(LONG_DELAY_MS);
95	assertFalse(t.isAlive());
96	assertEquals(ai.get(), 3);
97	}
98
99	/**
100	* repeated weakCompareAndSet succeeds in changing value when equal
101	* to expected
102	*/
103	public void testWeakCompareAndSet() {
104	AtomicLong ai = new AtomicLong(1);
105	while (!ai.weakCompareAndSet(1,2));
106	while (!ai.weakCompareAndSet(2,-4));
107	assertEquals(-4,ai.get());
108	while (!ai.weakCompareAndSet(-4,7));
109	assertEquals(7,ai.get());
110	}
111
112	/**
113	* getAndSet returns previous value and sets to given value
114	*/
115	public void testGetAndSet() {
116	AtomicLong ai = new AtomicLong(1);
117	assertEquals(1,ai.getAndSet(0));
118	assertEquals(0,ai.getAndSet(-10));
119	assertEquals(-10,ai.getAndSet(1));
120	}
121
122	/**
123	* getAndAdd returns previous value and adds given value
124	*/
125	public void testGetAndAdd() {
126	AtomicLong ai = new AtomicLong(1);
127	assertEquals(1,ai.getAndAdd(2));
128	assertEquals(3,ai.get());
129	assertEquals(3,ai.getAndAdd(-4));
130	assertEquals(-1,ai.get());
131	}
132
133	/**
134	* getAndDecrement returns previous value and decrements
135	*/
136	public void testGetAndDecrement() {
137	AtomicLong ai = new AtomicLong(1);
138	assertEquals(1,ai.getAndDecrement());
139	assertEquals(0,ai.getAndDecrement());
140	assertEquals(-1,ai.getAndDecrement());
141	}
142
143	/**
144	* getAndIncrement returns previous value and increments
145	*/
146	public void testGetAndIncrement() {
147	AtomicLong ai = new AtomicLong(1);
148	assertEquals(1,ai.getAndIncrement());
149	assertEquals(2,ai.get());
150	ai.set(-2);
151	assertEquals(-2,ai.getAndIncrement());
152	assertEquals(-1,ai.getAndIncrement());
153	assertEquals(0,ai.getAndIncrement());
154	assertEquals(1,ai.get());
155	}
156
157	/**
158	* addAndGet adds given value to current, and returns current value
159	*/
160	public void testAddAndGet() {
161	AtomicLong ai = new AtomicLong(1);
162	assertEquals(3,ai.addAndGet(2));
163	assertEquals(3,ai.get());
164	assertEquals(-1,ai.addAndGet(-4));
165	assertEquals(-1,ai.get());
166	}
167
168	/**
169	* decrementAndGet decrements and returns current value
170	*/
171	public void testDecrementAndGet() {
172	AtomicLong ai = new AtomicLong(1);
173	assertEquals(0,ai.decrementAndGet());
174	assertEquals(-1,ai.decrementAndGet());
175	assertEquals(-2,ai.decrementAndGet());
176	assertEquals(-2,ai.get());
177	}
178
179	/**
180	* incrementAndGet increments and returns current value
181	*/
182	public void testIncrementAndGet() {
183	AtomicLong ai = new AtomicLong(1);
184	assertEquals(2,ai.incrementAndGet());
185	assertEquals(2,ai.get());
186	ai.set(-2);
187	assertEquals(-1,ai.incrementAndGet());
188	assertEquals(0,ai.incrementAndGet());
189	assertEquals(1,ai.incrementAndGet());
190	assertEquals(1,ai.get());
191	}
192
193	/**
194	* a deserialized serialized atomic holds same value
195	*/
196	public void testSerialization() throws Exception {
197	AtomicLong x = new AtomicLong();
198	AtomicLong y = serialClone(x);
199	assertTrue(x != y);
200	x.set(-22);
201	AtomicLong z = serialClone(x);
202	assertEquals(-22, x.get());
203	assertEquals(0, y.get());
204	assertEquals(-22, z.get());
205	}
206
207	/**
208	* toString returns current value.
209	*/
210	public void testToString() {
211	AtomicLong ai = new AtomicLong();
212	assertEquals("0", ai.toString());
213	for (long i : VALUES) {
214	ai.set(i);
215	assertEquals(ai.toString(), Long.toString(i));
216	}
217	}
218
219	/**
220	* intValue returns current value.
221	*/
222	public void testIntValue() {
223	AtomicLong ai = new AtomicLong();
224	assertEquals(0, ai.intValue());
225	for (long x : VALUES) {
226	ai.set(x);
227	assertEquals((int)x, ai.intValue());
228	}
229	}
230
231	/**
232	* longValue returns current value.
233	*/
234	public void testLongValue() {
235	AtomicLong ai = new AtomicLong();
236	assertEquals(0L, ai.longValue());
237	for (long x : VALUES) {
238	ai.set(x);
239	assertEquals(x, ai.longValue());
240	}
241	}
242
243	/**
244	* floatValue returns current value.
245	*/
246	public void testFloatValue() {
247	AtomicLong ai = new AtomicLong();
248	assertEquals(0.0f, ai.floatValue());
249	for (long x : VALUES) {
250	ai.set(x);
251	assertEquals((float)x, ai.floatValue());
252	}
253	}
254
255	/**
256	* doubleValue returns current value.
257	*/
258	public void testDoubleValue() {
259	AtomicLong ai = new AtomicLong();
260	assertEquals(0.0d, ai.doubleValue());
261	for (long x : VALUES) {
262	ai.set(x);
263	assertEquals((double)x, ai.doubleValue());
264	}
265	}
266
267	}