test/tck/AtomicIntegerTest.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.AtomicInteger;

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

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

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

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

    /**
     * get returns the last value set
     */
    public void testGetSet() {
        AtomicInteger ai = new AtomicInteger(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() {
        AtomicInteger ai = new AtomicInteger(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() {
        AtomicInteger ai = new AtomicInteger(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 AtomicInteger ai = new AtomicInteger(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() {
        AtomicInteger ai = new AtomicInteger(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() {
        AtomicInteger ai = new AtomicInteger(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() {
        AtomicInteger ai = new AtomicInteger(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() {
        AtomicInteger ai = new AtomicInteger(1);
        assertEquals(1, ai.getAndDecrement());
        assertEquals(0, ai.getAndDecrement());
        assertEquals(-1, ai.getAndDecrement());
    }

    /**
     * getAndIncrement returns previous value and increments
     */
    public void testGetAndIncrement() {
        AtomicInteger ai = new AtomicInteger(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() {
        AtomicInteger ai = new AtomicInteger(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() {
        AtomicInteger ai = new AtomicInteger(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() {
        AtomicInteger ai = new AtomicInteger(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 {
        AtomicInteger x = new AtomicInteger();
        AtomicInteger y = serialClone(x);
        assertTrue(x != y);
        x.set(22);
        AtomicInteger z = serialClone(x);
        assertEquals(22, x.get());
        assertEquals(0, y.get());
        assertEquals(22, z.get());
    }

    /**
     * toString returns current value.
     */
    public void testToString() {
        AtomicInteger ai = new AtomicInteger();
        assertEquals("0", ai.toString());
        for (int x : VALUES) {
            ai.set(x);
            assertEquals(ai.toString(), Integer.toString(x));
        }
    }

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

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

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

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

}
Revision:	1.23
Committed:	Fri Jun 10 20:01:21 2011 UTC (12 years, 10 months ago) by jsr166
Branch:	MAIN
Changes since 1.22:	+50 -50 lines
Log Message:	whitespace
#	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	1.21	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.12	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9			import junit.framework.*;
10	jsr166	1.22	import java.util.concurrent.atomic.AtomicInteger;
11	dl	1.1
12	dl	1.3	public class AtomicIntegerTest extends JSR166TestCase {
13	jsr166	1.20	public static void main(String[] args) {
14			junit.textui.TestRunner.run(suite());
15	dl	1.1	}
16			public static Test suite() {
17			return new TestSuite(AtomicIntegerTest.class);
18			}
19
20	jsr166	1.18	final int[] VALUES = {
21			Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE,
22			};
23
24	dl	1.4	/**
25	dl	1.5	* constructor initializes to given value
26	dl	1.4	*/
27	jsr166	1.14	public void testConstructor() {
28	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
29	jsr166	1.23	assertEquals(1, ai.get());
30	dl	1.1	}
31
32	dl	1.4	/**
33	dl	1.7	* default constructed initializes to zero
34	dl	1.4	*/
35	jsr166	1.14	public void testConstructor2() {
36	dl	1.1	AtomicInteger ai = new AtomicInteger();
37	jsr166	1.23	assertEquals(0, ai.get());
38	dl	1.1	}
39
40	dl	1.4	/**
41	dl	1.11	* get returns the last value set
42			*/
43	jsr166	1.14	public void testGetSet() {
44	dl	1.11	AtomicInteger ai = new AtomicInteger(1);
45	jsr166	1.23	assertEquals(1, ai.get());
46	jsr166	1.17	ai.set(2);
47	jsr166	1.23	assertEquals(2, ai.get());
48	jsr166	1.17	ai.set(-3);
49	jsr166	1.23	assertEquals(-3, ai.get());
50	dl	1.11	}
51
52			/**
53	dl	1.10	* get returns the last value lazySet in same thread
54	dl	1.4	*/
55	jsr166	1.14	public void testGetLazySet() {
56	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
57	jsr166	1.23	assertEquals(1, ai.get());
58	jsr166	1.17	ai.lazySet(2);
59	jsr166	1.23	assertEquals(2, ai.get());
60	jsr166	1.17	ai.lazySet(-3);
61	jsr166	1.23	assertEquals(-3, ai.get());
62	jsr166	1.19	}
63	jsr166	1.12
64	dl	1.4	/**
65	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
66	dl	1.4	*/
67	jsr166	1.14	public void testCompareAndSet() {
68	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
69	jsr166	1.23	assertTrue(ai.compareAndSet(1, 2));
70			assertTrue(ai.compareAndSet(2, -4));
71			assertEquals(-4, ai.get());
72			assertFalse(ai.compareAndSet(-5, 7));
73			assertEquals(-4, ai.get());
74			assertTrue(ai.compareAndSet(-4, 7));
75			assertEquals(7, ai.get());
76	dl	1.1	}
77
78	dl	1.4	/**
79	dl	1.5	* compareAndSet in one thread enables another waiting for value
80			* to succeed
81			*/
82	jsr166	1.15	public void testCompareAndSetInMultipleThreads() throws Exception {
83	dl	1.5	final AtomicInteger ai = new AtomicInteger(1);
84	jsr166	1.16	Thread t = new Thread(new CheckedRunnable() {
85			public void realRun() {
86			while (!ai.compareAndSet(2, 3))
87			Thread.yield();
88			}});
89	jsr166	1.15
90			t.start();
91			assertTrue(ai.compareAndSet(1, 2));
92			t.join(LONG_DELAY_MS);
93			assertFalse(t.isAlive());
94			assertEquals(ai.get(), 3);
95	dl	1.5	}
96
97			/**
98			* repeated weakCompareAndSet succeeds in changing value when equal
99	jsr166	1.12	* to expected
100	dl	1.4	*/
101	jsr166	1.14	public void testWeakCompareAndSet() {
102	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
103	jsr166	1.23	while (!ai.weakCompareAndSet(1, 2));
104			while (!ai.weakCompareAndSet(2, -4));
105			assertEquals(-4, ai.get());
106			while (!ai.weakCompareAndSet(-4, 7));
107			assertEquals(7, ai.get());
108	dl	1.1	}
109
110	dl	1.4	/**
111	dl	1.5	* getAndSet returns previous value and sets to given value
112	dl	1.4	*/
113	jsr166	1.14	public void testGetAndSet() {
114	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
115	jsr166	1.23	assertEquals(1, ai.getAndSet(0));
116			assertEquals(0, ai.getAndSet(-10));
117			assertEquals(-10, ai.getAndSet(1));
118	dl	1.1	}
119
120	dl	1.4	/**
121	dl	1.5	* getAndAdd returns previous value and adds given value
122	dl	1.4	*/
123	jsr166	1.14	public void testGetAndAdd() {
124	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
125	jsr166	1.23	assertEquals(1, ai.getAndAdd(2));
126			assertEquals(3, ai.get());
127			assertEquals(3, ai.getAndAdd(-4));
128			assertEquals(-1, ai.get());
129	dl	1.1	}
130
131	dl	1.4	/**
132	dl	1.5	* getAndDecrement returns previous value and decrements
133	dl	1.4	*/
134	jsr166	1.14	public void testGetAndDecrement() {
135	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
136	jsr166	1.23	assertEquals(1, ai.getAndDecrement());
137			assertEquals(0, ai.getAndDecrement());
138			assertEquals(-1, ai.getAndDecrement());
139	dl	1.1	}
140
141	dl	1.4	/**
142	dl	1.5	* getAndIncrement returns previous value and increments
143	dl	1.4	*/
144	jsr166	1.14	public void testGetAndIncrement() {
145	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
146	jsr166	1.23	assertEquals(1, ai.getAndIncrement());
147			assertEquals(2, ai.get());
148	jsr166	1.17	ai.set(-2);
149	jsr166	1.23	assertEquals(-2, ai.getAndIncrement());
150			assertEquals(-1, ai.getAndIncrement());
151			assertEquals(0, ai.getAndIncrement());
152			assertEquals(1, ai.get());
153	dl	1.1	}
154
155	dl	1.4	/**
156	dl	1.5	* addAndGet adds given value to current, and returns current value
157	dl	1.4	*/
158	jsr166	1.14	public void testAddAndGet() {
159	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
160	jsr166	1.23	assertEquals(3, ai.addAndGet(2));
161			assertEquals(3, ai.get());
162			assertEquals(-1, ai.addAndGet(-4));
163			assertEquals(-1, ai.get());
164	dl	1.1	}
165
166	dl	1.4	/**
167	dl	1.5	* decrementAndGet decrements and returns current value
168	dl	1.4	*/
169	jsr166	1.14	public void testDecrementAndGet() {
170	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
171	jsr166	1.23	assertEquals(0, ai.decrementAndGet());
172			assertEquals(-1, ai.decrementAndGet());
173			assertEquals(-2, ai.decrementAndGet());
174			assertEquals(-2, ai.get());
175	dl	1.1	}
176
177	dl	1.4	/**
178	dl	1.5	* incrementAndGet increments and returns current value
179	dl	1.4	*/
180	jsr166	1.14	public void testIncrementAndGet() {
181	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
182	jsr166	1.23	assertEquals(2, ai.incrementAndGet());
183			assertEquals(2, ai.get());
184	jsr166	1.17	ai.set(-2);
185	jsr166	1.23	assertEquals(-1, ai.incrementAndGet());
186			assertEquals(0, ai.incrementAndGet());
187			assertEquals(1, ai.incrementAndGet());
188			assertEquals(1, ai.get());
189	dl	1.2	}
190
191	dl	1.4	/**
192	dl	1.5	* a deserialized serialized atomic holds same value
193	dl	1.4	*/
194	jsr166	1.15	public void testSerialization() throws Exception {
195	jsr166	1.22	AtomicInteger x = new AtomicInteger();
196			AtomicInteger y = serialClone(x);
197			assertTrue(x != y);
198			x.set(22);
199			AtomicInteger z = serialClone(x);
200			assertEquals(22, x.get());
201			assertEquals(0, y.get());
202			assertEquals(22, z.get());
203	dl	1.1	}
204
205	dl	1.8	/**
206			* toString returns current value.
207	jsr166	1.12	*/
208	dl	1.8	public void testToString() {
209			AtomicInteger ai = new AtomicInteger();
210	jsr166	1.18	assertEquals("0", ai.toString());
211			for (int x : VALUES) {
212			ai.set(x);
213			assertEquals(ai.toString(), Integer.toString(x));
214	dl	1.8	}
215			}
216	dl	1.1
217	dl	1.9	/**
218			* intValue returns current value.
219	jsr166	1.12	*/
220	dl	1.9	public void testIntValue() {
221			AtomicInteger ai = new AtomicInteger();
222	jsr166	1.18	assertEquals(0, ai.intValue());
223			for (int x : VALUES) {
224			ai.set(x);
225			assertEquals(x, ai.intValue());
226	dl	1.9	}
227			}
228
229			/**
230			* longValue returns current value.
231	jsr166	1.12	*/
232	dl	1.9	public void testLongValue() {
233			AtomicInteger ai = new AtomicInteger();
234	jsr166	1.18	assertEquals(0L, ai.longValue());
235			for (int x : VALUES) {
236			ai.set(x);
237			assertEquals((long)x, ai.longValue());
238	dl	1.9	}
239			}
240
241			/**
242			* floatValue returns current value.
243	jsr166	1.12	*/
244	dl	1.9	public void testFloatValue() {
245			AtomicInteger ai = new AtomicInteger();
246	jsr166	1.18	assertEquals(0.0f, ai.floatValue());
247			for (int x : VALUES) {
248			ai.set(x);
249			assertEquals((float)x, ai.floatValue());
250	dl	1.9	}
251			}
252
253			/**
254			* doubleValue returns current value.
255	jsr166	1.12	*/
256	dl	1.9	public void testDoubleValue() {
257			AtomicInteger ai = new AtomicInteger();
258	jsr166	1.18	assertEquals(0.0d, ai.doubleValue());
259			for (int x : VALUES) {
260			ai.set(x);
261			assertEquals((double)x, ai.doubleValue());
262	dl	1.9	}
263			}
264
265	dl	1.1	}