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 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 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:	1.15
Committed:	Tue Nov 17 06:58:50 2009 UTC (14 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.14:	+5 -4 lines
Log Message:	Runnable => CheckedRunnable
#	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	jsr166	1.15	Thread t = new Thread(new CheckedRunnable() {
84			public void realRun() {
85			while (!ai.compareAndSet(2, 3))
86			Thread.yield();
87			}});
88	jsr166	1.14
89			t.start();
90			assertTrue(ai.compareAndSet(1, 2));
91			t.join(LONG_DELAY_MS);
92			assertFalse(t.isAlive());
93			assertEquals(ai.get(), 3);
94	dl	1.5	}
95
96			/**
97			* repeated weakCompareAndSet succeeds in changing value when equal
98	jsr166	1.11	* to expected
99	dl	1.4	*/
100	jsr166	1.13	public void testWeakCompareAndSet() {
101	dl	1.1	AtomicLong ai = new AtomicLong(1);
102	jsr166	1.12	while (!ai.weakCompareAndSet(1,2));
103			while (!ai.weakCompareAndSet(2,-4));
104	dl	1.1	assertEquals(-4,ai.get());
105	jsr166	1.12	while (!ai.weakCompareAndSet(-4,7));
106	dl	1.1	assertEquals(7,ai.get());
107			}
108
109	dl	1.4	/**
110	dl	1.5	* getAndSet returns previous value and sets to given value
111	dl	1.4	*/
112	jsr166	1.13	public void testGetAndSet() {
113	dl	1.1	AtomicLong ai = new AtomicLong(1);
114			assertEquals(1,ai.getAndSet(0));
115			assertEquals(0,ai.getAndSet(-10));
116			assertEquals(-10,ai.getAndSet(1));
117			}
118
119	dl	1.4	/**
120	dl	1.5	* getAndAdd returns previous value and adds given value
121	dl	1.4	*/
122	jsr166	1.13	public void testGetAndAdd() {
123	dl	1.1	AtomicLong ai = new AtomicLong(1);
124			assertEquals(1,ai.getAndAdd(2));
125			assertEquals(3,ai.get());
126			assertEquals(3,ai.getAndAdd(-4));
127			assertEquals(-1,ai.get());
128			}
129
130	dl	1.4	/**
131	dl	1.5	* getAndDecrement returns previous value and decrements
132	dl	1.4	*/
133	jsr166	1.13	public void testGetAndDecrement() {
134	dl	1.1	AtomicLong ai = new AtomicLong(1);
135			assertEquals(1,ai.getAndDecrement());
136			assertEquals(0,ai.getAndDecrement());
137			assertEquals(-1,ai.getAndDecrement());
138			}
139
140	dl	1.4	/**
141	dl	1.5	* getAndIncrement returns previous value and increments
142	dl	1.4	*/
143	jsr166	1.13	public void testGetAndIncrement() {
144	dl	1.1	AtomicLong ai = new AtomicLong(1);
145			assertEquals(1,ai.getAndIncrement());
146			assertEquals(2,ai.get());
147			ai.set(-2);
148			assertEquals(-2,ai.getAndIncrement());
149			assertEquals(-1,ai.getAndIncrement());
150			assertEquals(0,ai.getAndIncrement());
151			assertEquals(1,ai.get());
152			}
153
154	dl	1.4	/**
155	dl	1.5	* addAndGet adds given value to current, and returns current value
156	dl	1.4	*/
157	jsr166	1.13	public void testAddAndGet() {
158	dl	1.1	AtomicLong ai = new AtomicLong(1);
159			assertEquals(3,ai.addAndGet(2));
160			assertEquals(3,ai.get());
161			assertEquals(-1,ai.addAndGet(-4));
162			assertEquals(-1,ai.get());
163			}
164
165	dl	1.4	/**
166	dl	1.5	* decrementAndGet decrements and returns current value
167	dl	1.4	*/
168	jsr166	1.13	public void testDecrementAndGet() {
169	dl	1.1	AtomicLong ai = new AtomicLong(1);
170			assertEquals(0,ai.decrementAndGet());
171			assertEquals(-1,ai.decrementAndGet());
172			assertEquals(-2,ai.decrementAndGet());
173			assertEquals(-2,ai.get());
174			}
175
176	dl	1.4	/**
177	dl	1.5	* incrementAndGet increments and returns current value
178	dl	1.4	*/
179	jsr166	1.13	public void testIncrementAndGet() {
180	dl	1.1	AtomicLong ai = new AtomicLong(1);
181			assertEquals(2,ai.incrementAndGet());
182			assertEquals(2,ai.get());
183			ai.set(-2);
184			assertEquals(-1,ai.incrementAndGet());
185			assertEquals(0,ai.incrementAndGet());
186			assertEquals(1,ai.incrementAndGet());
187			assertEquals(1,ai.get());
188			}
189
190	dl	1.4	/**
191	dl	1.5	* a deserialized serialized atomic holds same value
192	dl	1.4	*/
193	jsr166	1.14	public void testSerialization() throws Exception {
194	dl	1.2	AtomicLong l = new AtomicLong();
195
196	jsr166	1.14	l.set(-22);
197			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
198			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
199			out.writeObject(l);
200			out.close();
201
202			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
203			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
204			AtomicLong r = (AtomicLong) in.readObject();
205			assertEquals(l.get(), r.get());
206	dl	1.2	}
207	dl	1.1
208	dl	1.8	/**
209			* toString returns current value.
210	jsr166	1.11	*/
211	dl	1.8	public void testToString() {
212			AtomicLong ai = new AtomicLong();
213			for (long i = -12; i < 6; ++i) {
214			ai.set(i);
215			assertEquals(ai.toString(), Long.toString(i));
216			}
217			}
218	dl	1.9
219			/**
220			* longValue returns current value.
221	jsr166	1.11	*/
222	dl	1.9	public void testLongValue() {
223			AtomicLong ai = new AtomicLong();
224			for (int i = -12; i < 6; ++i) {
225			ai.set(i);
226			assertEquals((long)i, ai.longValue());
227			}
228			}
229
230			/**
231			* floatValue returns current value.
232	jsr166	1.11	*/
233	dl	1.9	public void testFloatValue() {
234			AtomicLong ai = new AtomicLong();
235			for (int i = -12; i < 6; ++i) {
236			ai.set(i);
237			assertEquals((float)i, ai.floatValue());
238			}
239			}
240
241			/**
242			* doubleValue returns current value.
243	jsr166	1.11	*/
244	dl	1.9	public void testDoubleValue() {
245			AtomicLong ai = new AtomicLong();
246			for (int i = -12; i < 6; ++i) {
247			ai.set(i);
248			assertEquals((double)i, ai.doubleValue());
249			}
250			}
251
252
253	dl	1.1	}