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
#	Content
1	/*
2	* 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	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	* Pat Fisher, Mike Judd.
7	*/
8
9	import junit.framework.*;
10	import java.util.concurrent.atomic.*;
11	import java.io.*;
12
13	public class AtomicIntegerTest extends JSR166TestCase {
14	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	/**
22	* constructor initializes to given value
23	*/
24	public void testConstructor() {
25	AtomicInteger ai = new AtomicInteger(1);
26	assertEquals(1,ai.get());
27	}
28
29	/**
30	* default constructed initializes to zero
31	*/
32	public void testConstructor2() {
33	AtomicInteger ai = new AtomicInteger();
34	assertEquals(0,ai.get());
35	}
36
37	/**
38	* get returns the last value set
39	*/
40	public void testGetSet() {
41	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
48	}
49
50	/**
51	* get returns the last value lazySet in same thread
52	*/
53	public void testGetLazySet() {
54	AtomicInteger ai = new AtomicInteger(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
61	}
62	/**
63	* compareAndSet succeeds in changing value if equal to expected else fails
64	*/
65	public void testCompareAndSet() {
66	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	/**
77	* compareAndSet in one thread enables another waiting for value
78	* to succeed
79	*/
80	public void testCompareAndSetInMultipleThreads() throws Exception {
81	final AtomicInteger ai = new AtomicInteger(1);
82	Thread t = new Thread(new Runnable() {
83	public void run() {
84	while (!ai.compareAndSet(2, 3)) Thread.yield();
85	}});
86
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	}
93
94	/**
95	* repeated weakCompareAndSet succeeds in changing value when equal
96	* to expected
97	*/
98	public void testWeakCompareAndSet() {
99	AtomicInteger ai = new AtomicInteger(1);
100	while (!ai.weakCompareAndSet(1,2));
101	while (!ai.weakCompareAndSet(2,-4));
102	assertEquals(-4,ai.get());
103	while (!ai.weakCompareAndSet(-4,7));
104	assertEquals(7,ai.get());
105	}
106
107	/**
108	* getAndSet returns previous value and sets to given value
109	*/
110	public void testGetAndSet() {
111	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	/**
118	* getAndAdd returns previous value and adds given value
119	*/
120	public void testGetAndAdd() {
121	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	/**
129	* getAndDecrement returns previous value and decrements
130	*/
131	public void testGetAndDecrement() {
132	AtomicInteger ai = new AtomicInteger(1);
133	assertEquals(1,ai.getAndDecrement());
134	assertEquals(0,ai.getAndDecrement());
135	assertEquals(-1,ai.getAndDecrement());
136	}
137
138	/**
139	* getAndIncrement returns previous value and increments
140	*/
141	public void testGetAndIncrement() {
142	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	/**
153	* addAndGet adds given value to current, and returns current value
154	*/
155	public void testAddAndGet() {
156	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	/**
164	* decrementAndGet decrements and returns current value
165	*/
166	public void testDecrementAndGet() {
167	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	/**
175	* incrementAndGet increments and returns current value
176	*/
177	public void testIncrementAndGet() {
178	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	}
187
188	/**
189	* a deserialized serialized atomic holds same value
190	*/
191	public void testSerialization() throws Exception {
192	AtomicInteger l = new AtomicInteger();
193
194	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	}
205
206	/**
207	* toString returns current value.
208	*/
209	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
217	/**
218	* intValue returns current value.
219	*/
220	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	*/
232	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	*/
243	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	*/
254	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	}