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

    /**
     * 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));
        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 AtomicInteger ai = new AtomicInteger(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() {
        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 l = new AtomicInteger();

        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));
        AtomicInteger r = (AtomicInteger) in.readObject();
        assertEquals(l.get(), r.get());
    }

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

    /**
     * intValue returns current value.
     */
    public void testIntValue() {
        AtomicInteger ai = new AtomicInteger();
        for (int i = -12; i < 6; ++i) {
            ai.set(i);
            assertEquals(i, ai.intValue());
        }
    }


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

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

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


}
Revision:	1.15
Committed:	Tue Nov 17 03:12:51 2009 UTC (14 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.14:	+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	1.12	* 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 AtomicIntegerTest 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(AtomicIntegerTest.class);
19			}
20
21	dl	1.4	/**
22	dl	1.5	* constructor initializes to given value
23	dl	1.4	*/
24	jsr166	1.14	public void testConstructor() {
25	dl	1.1	AtomicInteger ai = new AtomicInteger(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	1.14	public void testConstructor2() {
33	dl	1.1	AtomicInteger ai = new AtomicInteger();
34			assertEquals(0,ai.get());
35			}
36
37	dl	1.4	/**
38	dl	1.11	* get returns the last value set
39			*/
40	jsr166	1.14	public void testGetSet() {
41	dl	1.11	AtomicInteger ai = new AtomicInteger(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	1.12
48	dl	1.11	}
49
50			/**
51	dl	1.10	* get returns the last value lazySet in same thread
52	dl	1.4	*/
53	jsr166	1.14	public void testGetLazySet() {
54	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
55			assertEquals(1,ai.get());
56	dl	1.10	ai.lazySet(2);
57	dl	1.1	assertEquals(2,ai.get());
58	dl	1.10	ai.lazySet(-3);
59	dl	1.1	assertEquals(-3,ai.get());
60	jsr166	1.12
61	dl	1.1	}
62	dl	1.4	/**
63	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
64	dl	1.4	*/
65	jsr166	1.14	public void testCompareAndSet() {
66	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
67			assertTrue(ai.compareAndSet(1,2));
68			assertTrue(ai.compareAndSet(2,-4));
69			assertEquals(-4,ai.get());
70			assertFalse(ai.compareAndSet(-5,7));
71			assertFalse((7 == ai.get()));
72			assertTrue(ai.compareAndSet(-4,7));
73			assertEquals(7,ai.get());
74			}
75
76	dl	1.4	/**
77	dl	1.5	* compareAndSet in one thread enables another waiting for value
78			* to succeed
79			*/
80	jsr166	1.15	public void testCompareAndSetInMultipleThreads() throws Exception {
81	dl	1.5	final AtomicInteger ai = new AtomicInteger(1);
82			Thread t = new Thread(new Runnable() {
83			public void run() {
84	jsr166	1.13	while (!ai.compareAndSet(2, 3)) Thread.yield();
85	dl	1.5	}});
86	jsr166	1.15
87			t.start();
88			assertTrue(ai.compareAndSet(1, 2));
89			t.join(LONG_DELAY_MS);
90			assertFalse(t.isAlive());
91			assertEquals(ai.get(), 3);
92	dl	1.5	}
93
94			/**
95			* repeated weakCompareAndSet succeeds in changing value when equal
96	jsr166	1.12	* to expected
97	dl	1.4	*/
98	jsr166	1.14	public void testWeakCompareAndSet() {
99	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
100	jsr166	1.13	while (!ai.weakCompareAndSet(1,2));
101			while (!ai.weakCompareAndSet(2,-4));
102	dl	1.1	assertEquals(-4,ai.get());
103	jsr166	1.13	while (!ai.weakCompareAndSet(-4,7));
104	dl	1.1	assertEquals(7,ai.get());
105			}
106
107	dl	1.4	/**
108	dl	1.5	* getAndSet returns previous value and sets to given value
109	dl	1.4	*/
110	jsr166	1.14	public void testGetAndSet() {
111	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
112			assertEquals(1,ai.getAndSet(0));
113			assertEquals(0,ai.getAndSet(-10));
114			assertEquals(-10,ai.getAndSet(1));
115			}
116
117	dl	1.4	/**
118	dl	1.5	* getAndAdd returns previous value and adds given value
119	dl	1.4	*/
120	jsr166	1.14	public void testGetAndAdd() {
121	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
122			assertEquals(1,ai.getAndAdd(2));
123			assertEquals(3,ai.get());
124			assertEquals(3,ai.getAndAdd(-4));
125			assertEquals(-1,ai.get());
126			}
127
128	dl	1.4	/**
129	dl	1.5	* getAndDecrement returns previous value and decrements
130	dl	1.4	*/
131	jsr166	1.14	public void testGetAndDecrement() {
132	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
133			assertEquals(1,ai.getAndDecrement());
134			assertEquals(0,ai.getAndDecrement());
135			assertEquals(-1,ai.getAndDecrement());
136			}
137
138	dl	1.4	/**
139	dl	1.5	* getAndIncrement returns previous value and increments
140	dl	1.4	*/
141	jsr166	1.14	public void testGetAndIncrement() {
142	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
143			assertEquals(1,ai.getAndIncrement());
144			assertEquals(2,ai.get());
145			ai.set(-2);
146			assertEquals(-2,ai.getAndIncrement());
147			assertEquals(-1,ai.getAndIncrement());
148			assertEquals(0,ai.getAndIncrement());
149			assertEquals(1,ai.get());
150			}
151
152	dl	1.4	/**
153	dl	1.5	* addAndGet adds given value to current, and returns current value
154	dl	1.4	*/
155	jsr166	1.14	public void testAddAndGet() {
156	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
157			assertEquals(3,ai.addAndGet(2));
158			assertEquals(3,ai.get());
159			assertEquals(-1,ai.addAndGet(-4));
160			assertEquals(-1,ai.get());
161			}
162
163	dl	1.4	/**
164	dl	1.5	* decrementAndGet decrements and returns current value
165	dl	1.4	*/
166	jsr166	1.14	public void testDecrementAndGet() {
167	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
168			assertEquals(0,ai.decrementAndGet());
169			assertEquals(-1,ai.decrementAndGet());
170			assertEquals(-2,ai.decrementAndGet());
171			assertEquals(-2,ai.get());
172			}
173
174	dl	1.4	/**
175	dl	1.5	* incrementAndGet increments and returns current value
176	dl	1.4	*/
177	jsr166	1.14	public void testIncrementAndGet() {
178	dl	1.1	AtomicInteger ai = new AtomicInteger(1);
179			assertEquals(2,ai.incrementAndGet());
180			assertEquals(2,ai.get());
181			ai.set(-2);
182			assertEquals(-1,ai.incrementAndGet());
183			assertEquals(0,ai.incrementAndGet());
184			assertEquals(1,ai.incrementAndGet());
185			assertEquals(1,ai.get());
186	dl	1.2	}
187
188	dl	1.4	/**
189	dl	1.5	* a deserialized serialized atomic holds same value
190	dl	1.4	*/
191	jsr166	1.15	public void testSerialization() throws Exception {
192	dl	1.2	AtomicInteger l = new AtomicInteger();
193
194	jsr166	1.15	l.set(22);
195			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
196			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
197			out.writeObject(l);
198			out.close();
199
200			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
201			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
202			AtomicInteger r = (AtomicInteger) in.readObject();
203			assertEquals(l.get(), r.get());
204	dl	1.1	}
205
206	dl	1.8	/**
207			* toString returns current value.
208	jsr166	1.12	*/
209	dl	1.8	public void testToString() {
210			AtomicInteger ai = new AtomicInteger();
211			for (int i = -12; i < 6; ++i) {
212			ai.set(i);
213			assertEquals(ai.toString(), Integer.toString(i));
214			}
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			for (int i = -12; i < 6; ++i) {
223			ai.set(i);
224			assertEquals(i, ai.intValue());
225			}
226			}
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			for (int i = -12; i < 6; ++i) {
235			ai.set(i);
236			assertEquals((long)i, ai.longValue());
237			}
238			}
239
240			/**
241			* floatValue returns current value.
242	jsr166	1.12	*/
243	dl	1.9	public void testFloatValue() {
244			AtomicInteger ai = new AtomicInteger();
245			for (int i = -12; i < 6; ++i) {
246			ai.set(i);
247			assertEquals((float)i, ai.floatValue());
248			}
249			}
250
251			/**
252			* doubleValue returns current value.
253	jsr166	1.12	*/
254	dl	1.9	public void testDoubleValue() {
255			AtomicInteger ai = new AtomicInteger();
256			for (int i = -12; i < 6; ++i) {
257			ai.set(i);
258			assertEquals((double)i, ai.doubleValue());
259			}
260			}
261
262
263
264	dl	1.1	}