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
#	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 AtomicLongTest 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(AtomicLongTest.class);
19	}
20
21	/**
22	* constructor initializes to given value
23	*/
24	public void testConstructor() {
25	AtomicLong ai = new AtomicLong(1);
26	assertEquals(1,ai.get());
27	}
28
29	/**
30	* default constructed initializes to zero
31	*/
32	public void testConstructor2() {
33	AtomicLong ai = new AtomicLong();
34	assertEquals(0,ai.get());
35	}
36
37	/**
38	* get returns the last value set
39	*/
40	public void testGetSet() {
41	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
48	}
49
50	/**
51	* get returns the last value lazySet in same thread
52	*/
53	public void testGetLazySet() {
54	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
61	}
62
63	/**
64	* compareAndSet succeeds in changing value if equal to expected else fails
65	*/
66	public void testCompareAndSet() {
67	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	/**
78	* compareAndSet in one thread enables another waiting for value
79	* to succeed
80	*/
81	public void testCompareAndSetInMultipleThreads() throws Exception {
82	final AtomicLong ai = new AtomicLong(1);
83	Thread t = new Thread(new Runnable() {
84	public void run() {
85	while (!ai.compareAndSet(2, 3)) Thread.yield();
86	}});
87
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
95	/**
96	* repeated weakCompareAndSet succeeds in changing value when equal
97	* to expected
98	*/
99	public void testWeakCompareAndSet() {
100	AtomicLong ai = new AtomicLong(1);
101	while (!ai.weakCompareAndSet(1,2));
102	while (!ai.weakCompareAndSet(2,-4));
103	assertEquals(-4,ai.get());
104	while (!ai.weakCompareAndSet(-4,7));
105	assertEquals(7,ai.get());
106	}
107
108	/**
109	* getAndSet returns previous value and sets to given value
110	*/
111	public void testGetAndSet() {
112	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	/**
119	* getAndAdd returns previous value and adds given value
120	*/
121	public void testGetAndAdd() {
122	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	/**
130	* getAndDecrement returns previous value and decrements
131	*/
132	public void testGetAndDecrement() {
133	AtomicLong ai = new AtomicLong(1);
134	assertEquals(1,ai.getAndDecrement());
135	assertEquals(0,ai.getAndDecrement());
136	assertEquals(-1,ai.getAndDecrement());
137	}
138
139	/**
140	* getAndIncrement returns previous value and increments
141	*/
142	public void testGetAndIncrement() {
143	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	/**
154	* addAndGet adds given value to current, and returns current value
155	*/
156	public void testAddAndGet() {
157	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	/**
165	* decrementAndGet decrements and returns current value
166	*/
167	public void testDecrementAndGet() {
168	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	/**
176	* incrementAndGet increments and returns current value
177	*/
178	public void testIncrementAndGet() {
179	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	/**
190	* a deserialized serialized atomic holds same value
191	*/
192	public void testSerialization() throws Exception {
193	AtomicLong l = new AtomicLong();
194
195	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	}
206
207	/**
208	* toString returns current value.
209	*/
210	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
218	/**
219	* longValue returns current value.
220	*/
221	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	*/
232	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	*/
243	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	}