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/licenses/publicdomain
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.*;
import java.util.concurrent.atomic.*;
import java.io.*;

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);
    }

    /**
     * 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));
        assertFalse((7 == 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 Runnable() {
                public void run() {
                    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 l = new AtomicLong();

        l.set(-22);
        ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
        ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
        out.writeObject(l);
        out.close();

        ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
        ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
        AtomicLong r = (AtomicLong) in.readObject();
        assertEquals(l.get(), r.get());
    }

    /**
     * toString returns current value.
     */
    public void testToString() {
        AtomicLong ai = new AtomicLong();
        for (long i = -12; i < 6; ++i) {
            ai.set(i);
            assertEquals(ai.toString(), Long.toString(i));
        }
    }

    /**
     * longValue returns current value.
     */
    public void testLongValue() {
        AtomicLong ai = new AtomicLong();
        for (int i = -12; i < 6; ++i) {
            ai.set(i);
            assertEquals((long)i, ai.longValue());
        }
    }

    /**
     * floatValue returns current value.
     */
    public void testFloatValue() {
        AtomicLong ai = new AtomicLong();
        for (int i = -12; i < 6; ++i) {
            ai.set(i);
            assertEquals((float)i, ai.floatValue());
        }
    }

    /**
     * doubleValue returns current value.
     */
    public void testDoubleValue() {
        AtomicLong ai = new AtomicLong();
        for (int i = -12; i < 6; ++i) {
            ai.set(i);
            assertEquals((double)i, ai.doubleValue());
        }
    }


}
Revision:	1.14
Committed:	Tue Nov 17 03:12:51 2009 UTC (14 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.13:	+18 -26 lines
Log Message:	nicer exception handling
#	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			* http://creativecommons.org/licenses/publicdomain
5	jsr166	1.11	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9			import junit.framework.*;
10			import java.util.concurrent.atomic.*;
11	dl	1.2	import java.io.*;
12	dl	1.1
13	dl	1.3	public class AtomicLongTest extends JSR166TestCase {
14	dl	1.1	public static void main (String[] args) {
15			junit.textui.TestRunner.run (suite());
16			}
17			public static Test suite() {
18			return new TestSuite(AtomicLongTest.class);
19			}
20
21	dl	1.4	/**
22	dl	1.5	* constructor initializes to given value
23	dl	1.4	*/
24	jsr166	1.13	public void testConstructor() {
25	dl	1.1	AtomicLong ai = new AtomicLong(1);
26			assertEquals(1,ai.get());
27			}
28
29	dl	1.4	/**
30	dl	1.7	* default constructed initializes to zero
31	dl	1.4	*/
32	jsr166	1.13	public void testConstructor2() {
33	dl	1.1	AtomicLong ai = new AtomicLong();
34			assertEquals(0,ai.get());
35			}
36
37	dl	1.4	/**
38	dl	1.5	* get returns the last value set
39	dl	1.4	*/
40	jsr166	1.13	public void testGetSet() {
41	dl	1.1	AtomicLong ai = new AtomicLong(1);
42			assertEquals(1,ai.get());
43			ai.set(2);
44			assertEquals(2,ai.get());
45			ai.set(-3);
46			assertEquals(-3,ai.get());
47	jsr166	1.11
48	dl	1.1	}
49	dl	1.10
50			/**
51			* get returns the last value lazySet in same thread
52			*/
53	jsr166	1.13	public void testGetLazySet() {
54	dl	1.10	AtomicLong ai = new AtomicLong(1);
55			assertEquals(1,ai.get());
56			ai.lazySet(2);
57			assertEquals(2,ai.get());
58			ai.lazySet(-3);
59			assertEquals(-3,ai.get());
60	jsr166	1.11
61	dl	1.10	}
62
63	dl	1.4	/**
64	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
65	dl	1.4	*/
66	jsr166	1.13	public void testCompareAndSet() {
67	dl	1.1	AtomicLong ai = new AtomicLong(1);
68			assertTrue(ai.compareAndSet(1,2));
69			assertTrue(ai.compareAndSet(2,-4));
70			assertEquals(-4,ai.get());
71			assertFalse(ai.compareAndSet(-5,7));
72			assertFalse((7 == ai.get()));
73			assertTrue(ai.compareAndSet(-4,7));
74			assertEquals(7,ai.get());
75			}
76
77	dl	1.4	/**
78	dl	1.5	* compareAndSet in one thread enables another waiting for value
79			* to succeed
80			*/
81	jsr166	1.14	public void testCompareAndSetInMultipleThreads() throws Exception {
82	dl	1.5	final AtomicLong ai = new AtomicLong(1);
83			Thread t = new Thread(new Runnable() {
84			public void run() {
85	jsr166	1.12	while (!ai.compareAndSet(2, 3)) Thread.yield();
86	dl	1.5	}});
87	jsr166	1.14
88			t.start();
89			assertTrue(ai.compareAndSet(1, 2));
90			t.join(LONG_DELAY_MS);
91			assertFalse(t.isAlive());
92			assertEquals(ai.get(), 3);
93	dl	1.5	}
94
95			/**
96			* repeated weakCompareAndSet succeeds in changing value when equal
97	jsr166	1.11	* to expected
98	dl	1.4	*/
99	jsr166	1.13	public void testWeakCompareAndSet() {
100	dl	1.1	AtomicLong ai = new AtomicLong(1);
101	jsr166	1.12	while (!ai.weakCompareAndSet(1,2));
102			while (!ai.weakCompareAndSet(2,-4));
103	dl	1.1	assertEquals(-4,ai.get());
104	jsr166	1.12	while (!ai.weakCompareAndSet(-4,7));
105	dl	1.1	assertEquals(7,ai.get());
106			}
107
108	dl	1.4	/**
109	dl	1.5	* getAndSet returns previous value and sets to given value
110	dl	1.4	*/
111	jsr166	1.13	public void testGetAndSet() {
112	dl	1.1	AtomicLong ai = new AtomicLong(1);
113			assertEquals(1,ai.getAndSet(0));
114			assertEquals(0,ai.getAndSet(-10));
115			assertEquals(-10,ai.getAndSet(1));
116			}
117
118	dl	1.4	/**
119	dl	1.5	* getAndAdd returns previous value and adds given value
120	dl	1.4	*/
121	jsr166	1.13	public void testGetAndAdd() {
122	dl	1.1	AtomicLong ai = new AtomicLong(1);
123			assertEquals(1,ai.getAndAdd(2));
124			assertEquals(3,ai.get());
125			assertEquals(3,ai.getAndAdd(-4));
126			assertEquals(-1,ai.get());
127			}
128
129	dl	1.4	/**
130	dl	1.5	* getAndDecrement returns previous value and decrements
131	dl	1.4	*/
132	jsr166	1.13	public void testGetAndDecrement() {
133	dl	1.1	AtomicLong ai = new AtomicLong(1);
134			assertEquals(1,ai.getAndDecrement());
135			assertEquals(0,ai.getAndDecrement());
136			assertEquals(-1,ai.getAndDecrement());
137			}
138
139	dl	1.4	/**
140	dl	1.5	* getAndIncrement returns previous value and increments
141	dl	1.4	*/
142	jsr166	1.13	public void testGetAndIncrement() {
143	dl	1.1	AtomicLong ai = new AtomicLong(1);
144			assertEquals(1,ai.getAndIncrement());
145			assertEquals(2,ai.get());
146			ai.set(-2);
147			assertEquals(-2,ai.getAndIncrement());
148			assertEquals(-1,ai.getAndIncrement());
149			assertEquals(0,ai.getAndIncrement());
150			assertEquals(1,ai.get());
151			}
152
153	dl	1.4	/**
154	dl	1.5	* addAndGet adds given value to current, and returns current value
155	dl	1.4	*/
156	jsr166	1.13	public void testAddAndGet() {
157	dl	1.1	AtomicLong ai = new AtomicLong(1);
158			assertEquals(3,ai.addAndGet(2));
159			assertEquals(3,ai.get());
160			assertEquals(-1,ai.addAndGet(-4));
161			assertEquals(-1,ai.get());
162			}
163
164	dl	1.4	/**
165	dl	1.5	* decrementAndGet decrements and returns current value
166	dl	1.4	*/
167	jsr166	1.13	public void testDecrementAndGet() {
168	dl	1.1	AtomicLong ai = new AtomicLong(1);
169			assertEquals(0,ai.decrementAndGet());
170			assertEquals(-1,ai.decrementAndGet());
171			assertEquals(-2,ai.decrementAndGet());
172			assertEquals(-2,ai.get());
173			}
174
175	dl	1.4	/**
176	dl	1.5	* incrementAndGet increments and returns current value
177	dl	1.4	*/
178	jsr166	1.13	public void testIncrementAndGet() {
179	dl	1.1	AtomicLong ai = new AtomicLong(1);
180			assertEquals(2,ai.incrementAndGet());
181			assertEquals(2,ai.get());
182			ai.set(-2);
183			assertEquals(-1,ai.incrementAndGet());
184			assertEquals(0,ai.incrementAndGet());
185			assertEquals(1,ai.incrementAndGet());
186			assertEquals(1,ai.get());
187			}
188
189	dl	1.4	/**
190	dl	1.5	* a deserialized serialized atomic holds same value
191	dl	1.4	*/
192	jsr166	1.14	public void testSerialization() throws Exception {
193	dl	1.2	AtomicLong l = new AtomicLong();
194
195	jsr166	1.14	l.set(-22);
196			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
197			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
198			out.writeObject(l);
199			out.close();
200
201			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
202			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
203			AtomicLong r = (AtomicLong) in.readObject();
204			assertEquals(l.get(), r.get());
205	dl	1.2	}
206	dl	1.1
207	dl	1.8	/**
208			* toString returns current value.
209	jsr166	1.11	*/
210	dl	1.8	public void testToString() {
211			AtomicLong ai = new AtomicLong();
212			for (long i = -12; i < 6; ++i) {
213			ai.set(i);
214			assertEquals(ai.toString(), Long.toString(i));
215			}
216			}
217	dl	1.9
218			/**
219			* longValue returns current value.
220	jsr166	1.11	*/
221	dl	1.9	public void testLongValue() {
222			AtomicLong ai = new AtomicLong();
223			for (int i = -12; i < 6; ++i) {
224			ai.set(i);
225			assertEquals((long)i, ai.longValue());
226			}
227			}
228
229			/**
230			* floatValue returns current value.
231	jsr166	1.11	*/
232	dl	1.9	public void testFloatValue() {
233			AtomicLong ai = new AtomicLong();
234			for (int i = -12; i < 6; ++i) {
235			ai.set(i);
236			assertEquals((float)i, ai.floatValue());
237			}
238			}
239
240			/**
241			* doubleValue returns current value.
242	jsr166	1.11	*/
243	dl	1.9	public void testDoubleValue() {
244			AtomicLong ai = new AtomicLong();
245			for (int i = -12; i < 6; ++i) {
246			ai.set(i);
247			assertEquals((double)i, ai.doubleValue());
248			}
249			}
250
251
252	dl	1.1	}