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 java.util.concurrent.atomic.AtomicLong;

import junit.framework.Test;
import junit.framework.TestSuite;

public class AtomicLongTest extends JSR166TestCase {
    public static void main(String[] args) {
        main(suite(), args);
    }
    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(3, ai.get());
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    @SuppressWarnings("deprecation")
    public void testWeakCompareAndSet() {
        AtomicLong ai = new AtomicLong(1);
        do {} while (!ai.weakCompareAndSet(1, 2));
        do {} while (!ai.weakCompareAndSet(2, -4));
        assertEquals(-4, ai.get());
        do {} 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/reserialized atomic holds same value
     */
    public void testSerialization() throws Exception {
        AtomicLong x = new AtomicLong();
        AtomicLong y = serialClone(x);
        assertNotSame(x, y);
        x.set(-22);
        AtomicLong z = serialClone(x);
        assertNotSame(y, z);
        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 x : VALUES) {
            ai.set(x);
            assertEquals(Long.toString(x), ai.toString());
        }
    }

    /**
     * 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:	1.34
Committed:	Tue Jan 26 13:33:05 2021 UTC (3 years, 3 months ago) by dl
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.33:	+1 -0 lines
Log Message:	Replace Integer with Item class
#	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	1.20	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.11	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9	jsr166	1.22	import java.util.concurrent.atomic.AtomicLong;
10	dl	1.1
11	jsr166	1.27	import junit.framework.Test;
12			import junit.framework.TestSuite;
13
14	dl	1.3	public class AtomicLongTest extends JSR166TestCase {
15	jsr166	1.19	public static void main(String[] args) {
16	jsr166	1.29	main(suite(), args);
17	dl	1.1	}
18			public static Test suite() {
19			return new TestSuite(AtomicLongTest.class);
20			}
21
22	jsr166	1.17	final long[] VALUES = {
23			Long.MIN_VALUE,
24			Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE,
25			Long.MAX_VALUE,
26			};
27
28	dl	1.4	/**
29	dl	1.5	* constructor initializes to given value
30	dl	1.4	*/
31	jsr166	1.13	public void testConstructor() {
32	dl	1.1	AtomicLong ai = new AtomicLong(1);
33	jsr166	1.23	assertEquals(1, ai.get());
34	dl	1.1	}
35
36	dl	1.4	/**
37	dl	1.7	* default constructed initializes to zero
38	dl	1.4	*/
39	jsr166	1.13	public void testConstructor2() {
40	dl	1.1	AtomicLong ai = new AtomicLong();
41	jsr166	1.23	assertEquals(0, ai.get());
42	dl	1.1	}
43
44	dl	1.4	/**
45	dl	1.5	* get returns the last value set
46	dl	1.4	*/
47	jsr166	1.13	public void testGetSet() {
48	dl	1.1	AtomicLong ai = new AtomicLong(1);
49	jsr166	1.23	assertEquals(1, ai.get());
50	jsr166	1.16	ai.set(2);
51	jsr166	1.23	assertEquals(2, ai.get());
52	jsr166	1.16	ai.set(-3);
53	jsr166	1.23	assertEquals(-3, ai.get());
54	dl	1.1	}
55	dl	1.10
56			/**
57			* get returns the last value lazySet in same thread
58			*/
59	jsr166	1.13	public void testGetLazySet() {
60	dl	1.10	AtomicLong ai = new AtomicLong(1);
61	jsr166	1.23	assertEquals(1, ai.get());
62	jsr166	1.16	ai.lazySet(2);
63	jsr166	1.23	assertEquals(2, ai.get());
64	jsr166	1.16	ai.lazySet(-3);
65	jsr166	1.23	assertEquals(-3, ai.get());
66	dl	1.10	}
67
68	dl	1.4	/**
69	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
70	dl	1.4	*/
71	jsr166	1.13	public void testCompareAndSet() {
72	dl	1.1	AtomicLong ai = new AtomicLong(1);
73	jsr166	1.23	assertTrue(ai.compareAndSet(1, 2));
74			assertTrue(ai.compareAndSet(2, -4));
75			assertEquals(-4, ai.get());
76			assertFalse(ai.compareAndSet(-5, 7));
77			assertEquals(-4, ai.get());
78			assertTrue(ai.compareAndSet(-4, 7));
79			assertEquals(7, ai.get());
80	dl	1.1	}
81
82	dl	1.4	/**
83	dl	1.5	* compareAndSet in one thread enables another waiting for value
84			* to succeed
85			*/
86	jsr166	1.14	public void testCompareAndSetInMultipleThreads() throws Exception {
87	dl	1.5	final AtomicLong ai = new AtomicLong(1);
88	jsr166	1.15	Thread t = new Thread(new CheckedRunnable() {
89			public void realRun() {
90			while (!ai.compareAndSet(2, 3))
91			Thread.yield();
92			}});
93	jsr166	1.14
94			t.start();
95			assertTrue(ai.compareAndSet(1, 2));
96			t.join(LONG_DELAY_MS);
97			assertFalse(t.isAlive());
98	jsr166	1.23	assertEquals(3, ai.get());
99	dl	1.5	}
100
101			/**
102			* repeated weakCompareAndSet succeeds in changing value when equal
103	jsr166	1.11	* to expected
104	dl	1.4	*/
105	dl	1.34	@SuppressWarnings("deprecation")
106	jsr166	1.13	public void testWeakCompareAndSet() {
107	dl	1.1	AtomicLong ai = new AtomicLong(1);
108	jsr166	1.28	do {} while (!ai.weakCompareAndSet(1, 2));
109			do {} while (!ai.weakCompareAndSet(2, -4));
110	jsr166	1.23	assertEquals(-4, ai.get());
111	jsr166	1.28	do {} while (!ai.weakCompareAndSet(-4, 7));
112	jsr166	1.23	assertEquals(7, ai.get());
113	dl	1.1	}
114
115	dl	1.4	/**
116	dl	1.5	* getAndSet returns previous value and sets to given value
117	dl	1.4	*/
118	jsr166	1.13	public void testGetAndSet() {
119	dl	1.1	AtomicLong ai = new AtomicLong(1);
120	jsr166	1.23	assertEquals(1, ai.getAndSet(0));
121			assertEquals(0, ai.getAndSet(-10));
122			assertEquals(-10, ai.getAndSet(1));
123	dl	1.1	}
124
125	dl	1.4	/**
126	dl	1.5	* getAndAdd returns previous value and adds given value
127	dl	1.4	*/
128	jsr166	1.13	public void testGetAndAdd() {
129	dl	1.1	AtomicLong ai = new AtomicLong(1);
130	jsr166	1.23	assertEquals(1, ai.getAndAdd(2));
131			assertEquals(3, ai.get());
132			assertEquals(3, ai.getAndAdd(-4));
133			assertEquals(-1, ai.get());
134	dl	1.1	}
135
136	dl	1.4	/**
137	dl	1.5	* getAndDecrement returns previous value and decrements
138	dl	1.4	*/
139	jsr166	1.13	public void testGetAndDecrement() {
140	dl	1.1	AtomicLong ai = new AtomicLong(1);
141	jsr166	1.23	assertEquals(1, ai.getAndDecrement());
142			assertEquals(0, ai.getAndDecrement());
143			assertEquals(-1, ai.getAndDecrement());
144	dl	1.1	}
145
146	dl	1.4	/**
147	dl	1.5	* getAndIncrement returns previous value and increments
148	dl	1.4	*/
149	jsr166	1.13	public void testGetAndIncrement() {
150	dl	1.1	AtomicLong ai = new AtomicLong(1);
151	jsr166	1.23	assertEquals(1, ai.getAndIncrement());
152			assertEquals(2, ai.get());
153	jsr166	1.16	ai.set(-2);
154	jsr166	1.23	assertEquals(-2, ai.getAndIncrement());
155			assertEquals(-1, ai.getAndIncrement());
156			assertEquals(0, ai.getAndIncrement());
157			assertEquals(1, ai.get());
158	dl	1.1	}
159
160	dl	1.4	/**
161	dl	1.5	* addAndGet adds given value to current, and returns current value
162	dl	1.4	*/
163	jsr166	1.13	public void testAddAndGet() {
164	dl	1.1	AtomicLong ai = new AtomicLong(1);
165	jsr166	1.23	assertEquals(3, ai.addAndGet(2));
166			assertEquals(3, ai.get());
167			assertEquals(-1, ai.addAndGet(-4));
168			assertEquals(-1, ai.get());
169	dl	1.1	}
170
171	dl	1.4	/**
172	dl	1.5	* decrementAndGet decrements and returns current value
173	dl	1.4	*/
174	jsr166	1.13	public void testDecrementAndGet() {
175	dl	1.1	AtomicLong ai = new AtomicLong(1);
176	jsr166	1.23	assertEquals(0, ai.decrementAndGet());
177			assertEquals(-1, ai.decrementAndGet());
178			assertEquals(-2, ai.decrementAndGet());
179			assertEquals(-2, ai.get());
180	dl	1.1	}
181
182	dl	1.4	/**
183	dl	1.5	* incrementAndGet increments and returns current value
184	dl	1.4	*/
185	jsr166	1.13	public void testIncrementAndGet() {
186	dl	1.1	AtomicLong ai = new AtomicLong(1);
187	jsr166	1.23	assertEquals(2, ai.incrementAndGet());
188			assertEquals(2, ai.get());
189	jsr166	1.16	ai.set(-2);
190	jsr166	1.23	assertEquals(-1, ai.incrementAndGet());
191			assertEquals(0, ai.incrementAndGet());
192			assertEquals(1, ai.incrementAndGet());
193			assertEquals(1, ai.get());
194	dl	1.1	}
195
196	dl	1.4	/**
197	jsr166	1.33	* a deserialized/reserialized atomic holds same value
198	dl	1.4	*/
199	jsr166	1.14	public void testSerialization() throws Exception {
200	jsr166	1.22	AtomicLong x = new AtomicLong();
201			AtomicLong y = serialClone(x);
202	jsr166	1.26	assertNotSame(x, y);
203	jsr166	1.22	x.set(-22);
204			AtomicLong z = serialClone(x);
205	jsr166	1.26	assertNotSame(y, z);
206	jsr166	1.22	assertEquals(-22, x.get());
207			assertEquals(0, y.get());
208			assertEquals(-22, z.get());
209	dl	1.2	}
210	dl	1.1
211	dl	1.8	/**
212			* toString returns current value.
213	jsr166	1.11	*/
214	dl	1.8	public void testToString() {
215			AtomicLong ai = new AtomicLong();
216	jsr166	1.17	assertEquals("0", ai.toString());
217	jsr166	1.25	for (long x : VALUES) {
218			ai.set(x);
219			assertEquals(Long.toString(x), ai.toString());
220	dl	1.8	}
221			}
222	dl	1.9
223			/**
224	jsr166	1.17	* intValue returns current value.
225			*/
226			public void testIntValue() {
227			AtomicLong ai = new AtomicLong();
228			assertEquals(0, ai.intValue());
229			for (long x : VALUES) {
230			ai.set(x);
231			assertEquals((int)x, ai.intValue());
232			}
233			}
234
235			/**
236	dl	1.9	* longValue returns current value.
237	jsr166	1.11	*/
238	dl	1.9	public void testLongValue() {
239			AtomicLong ai = new AtomicLong();
240	jsr166	1.17	assertEquals(0L, ai.longValue());
241			for (long x : VALUES) {
242			ai.set(x);
243	jsr166	1.21	assertEquals(x, ai.longValue());
244	dl	1.9	}
245			}
246
247			/**
248			* floatValue returns current value.
249	jsr166	1.11	*/
250	dl	1.9	public void testFloatValue() {
251			AtomicLong ai = new AtomicLong();
252	jsr166	1.17	assertEquals(0.0f, ai.floatValue());
253			for (long x : VALUES) {
254			ai.set(x);
255			assertEquals((float)x, ai.floatValue());
256	dl	1.9	}
257			}
258
259			/**
260			* doubleValue returns current value.
261	jsr166	1.11	*/
262	dl	1.9	public void testDoubleValue() {
263			AtomicLong ai = new AtomicLong();
264	jsr166	1.17	assertEquals(0.0d, ai.doubleValue());
265			for (long x : VALUES) {
266			ai.set(x);
267			assertEquals((double)x, ai.doubleValue());
268	dl	1.9	}
269			}
270
271	dl	1.1	}