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() {
        final AtomicLong ai = new AtomicLong(1);
        Thread t = new Thread(new Runnable() {
                public void run() {
                    while (!ai.compareAndSet(2, 3)) Thread.yield();
                }});
        try {
            t.start();
            assertTrue(ai.compareAndSet(1, 2));
            t.join(LONG_DELAY_MS);
            assertFalse(t.isAlive());
            assertEquals(ai.get(), 3);
        }
        catch (Exception e) {
            unexpectedException();
        }
    }

    /**
     * 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() {
        AtomicLong l = new AtomicLong();

        try {
            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());
        } catch (Exception e) {
            unexpectedException();
        }
    }

    /**
     * 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:	1.13
Committed:	Mon Nov 16 05:30:07 2009 UTC (14 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.12:	+14 -14 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			* 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			public void testCompareAndSetInMultipleThreads() {
82			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			try {
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			}
94	jsr166	1.12	catch (Exception e) {
95	dl	1.5	unexpectedException();
96			}
97			}
98
99			/**
100			* repeated weakCompareAndSet succeeds in changing value when equal
101	jsr166	1.11	* to expected
102	dl	1.4	*/
103	jsr166	1.13	public void testWeakCompareAndSet() {
104	dl	1.1	AtomicLong ai = new AtomicLong(1);
105	jsr166	1.12	while (!ai.weakCompareAndSet(1,2));
106			while (!ai.weakCompareAndSet(2,-4));
107	dl	1.1	assertEquals(-4,ai.get());
108	jsr166	1.12	while (!ai.weakCompareAndSet(-4,7));
109	dl	1.1	assertEquals(7,ai.get());
110			}
111
112	dl	1.4	/**
113	dl	1.5	* getAndSet returns previous value and sets to given value
114	dl	1.4	*/
115	jsr166	1.13	public void testGetAndSet() {
116	dl	1.1	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	dl	1.4	/**
123	dl	1.5	* getAndAdd returns previous value and adds given value
124	dl	1.4	*/
125	jsr166	1.13	public void testGetAndAdd() {
126	dl	1.1	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	dl	1.4	/**
134	dl	1.5	* getAndDecrement returns previous value and decrements
135	dl	1.4	*/
136	jsr166	1.13	public void testGetAndDecrement() {
137	dl	1.1	AtomicLong ai = new AtomicLong(1);
138			assertEquals(1,ai.getAndDecrement());
139			assertEquals(0,ai.getAndDecrement());
140			assertEquals(-1,ai.getAndDecrement());
141			}
142
143	dl	1.4	/**
144	dl	1.5	* getAndIncrement returns previous value and increments
145	dl	1.4	*/
146	jsr166	1.13	public void testGetAndIncrement() {
147	dl	1.1	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	dl	1.4	/**
158	dl	1.5	* addAndGet adds given value to current, and returns current value
159	dl	1.4	*/
160	jsr166	1.13	public void testAddAndGet() {
161	dl	1.1	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	dl	1.4	/**
169	dl	1.5	* decrementAndGet decrements and returns current value
170	dl	1.4	*/
171	jsr166	1.13	public void testDecrementAndGet() {
172	dl	1.1	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	dl	1.4	/**
180	dl	1.5	* incrementAndGet increments and returns current value
181	dl	1.4	*/
182	jsr166	1.13	public void testIncrementAndGet() {
183	dl	1.1	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	dl	1.4	/**
194	dl	1.5	* a deserialized serialized atomic holds same value
195	dl	1.4	*/
196	dl	1.2	public void testSerialization() {
197			AtomicLong l = new AtomicLong();
198
199			try {
200			l.set(-22);
201			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
202			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
203			out.writeObject(l);
204			out.close();
205
206			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
207			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
208			AtomicLong r = (AtomicLong) in.readObject();
209			assertEquals(l.get(), r.get());
210	jsr166	1.13	} catch (Exception e) {
211	dl	1.4	unexpectedException();
212	dl	1.2	}
213			}
214	dl	1.1
215	dl	1.8	/**
216			* toString returns current value.
217	jsr166	1.11	*/
218	dl	1.8	public void testToString() {
219			AtomicLong ai = new AtomicLong();
220			for (long i = -12; i < 6; ++i) {
221			ai.set(i);
222			assertEquals(ai.toString(), Long.toString(i));
223			}
224			}
225	dl	1.9
226			/**
227			* longValue returns current value.
228	jsr166	1.11	*/
229	dl	1.9	public void testLongValue() {
230			AtomicLong ai = new AtomicLong();
231			for (int i = -12; i < 6; ++i) {
232			ai.set(i);
233			assertEquals((long)i, ai.longValue());
234			}
235			}
236
237			/**
238			* floatValue returns current value.
239	jsr166	1.11	*/
240	dl	1.9	public void testFloatValue() {
241			AtomicLong ai = new AtomicLong();
242			for (int i = -12; i < 6; ++i) {
243			ai.set(i);
244			assertEquals((float)i, ai.floatValue());
245			}
246			}
247
248			/**
249			* doubleValue returns current value.
250	jsr166	1.11	*/
251	dl	1.9	public void testDoubleValue() {
252			AtomicLong ai = new AtomicLong();
253			for (int i = -12; i < 6; ++i) {
254			ai.set(i);
255			assertEquals((double)i, ai.doubleValue());
256			}
257			}
258
259
260	dl	1.1	}