test/tck/AtomicLongFieldUpdaterTest.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 java.util.concurrent.atomic.*;
import junit.framework.*;
import java.util.*;

public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
    volatile long x = 0;
    int z;
    long w;

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

    /**
     * Construction with non-existent field throws RuntimeException
     */
    public void testConstructor() {
        try {
            AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
                a = AtomicLongFieldUpdater.newUpdater
                (AtomicLongFieldUpdaterTest.class, "y");
            shouldThrow();
        } catch (RuntimeException success) {}
    }

    /**
     * construction with field not of given type throws RuntimeException
     */
    public void testConstructor2() {
        try {
            AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
                a = AtomicLongFieldUpdater.newUpdater
                (AtomicLongFieldUpdaterTest.class, "z");
            shouldThrow();
        } catch (RuntimeException success) {}
    }

    /**
     * construction with non-volatile field throws RuntimeException
     */
    public void testConstructor3() {
        try {
            AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
                a = AtomicLongFieldUpdater.newUpdater
                (AtomicLongFieldUpdaterTest.class, "w");
            shouldThrow();
        } catch (RuntimeException success) {}
    }

    /**
     * get returns the last value set or assigned
     */
    public void testGetSet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = 1;
        assertEquals(1,a.get(this));
        a.set(this,2);
        assertEquals(2,a.get(this));
        a.set(this,-3);
        assertEquals(-3,a.get(this));
    }

    /**
     * get returns the last value lazySet by same thread
     */
    public void testGetLazySet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = 1;
        assertEquals(1,a.get(this));
        a.lazySet(this,2);
        assertEquals(2,a.get(this));
        a.lazySet(this,-3);
        assertEquals(-3,a.get(this));
    }


    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = 1;
        assertTrue(a.compareAndSet(this,1,2));
        assertTrue(a.compareAndSet(this,2,-4));
        assertEquals(-4,a.get(this));
        assertFalse(a.compareAndSet(this,-5,7));
        assertEquals(-4,a.get(this));
        assertTrue(a.compareAndSet(this,-4,7));
        assertEquals(7,a.get(this));
    }


    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() throws Exception {
        x = 1;
        final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }

        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3))
                    Thread.yield();
            }});

        t.start();
        assertTrue(a.compareAndSet(this, 1, 2));
        t.join(LONG_DELAY_MS);
        assertFalse(t.isAlive());
        assertEquals(a.get(this), 3);
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = 1;
        while (!a.weakCompareAndSet(this,1,2));
        while (!a.weakCompareAndSet(this,2,-4));
        assertEquals(-4,a.get(this));
        while (!a.weakCompareAndSet(this,-4,7));
        assertEquals(7,a.get(this));
    }

    /**
     * getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = 1;
        assertEquals(1,a.getAndSet(this, 0));
        assertEquals(0,a.getAndSet(this,-10));
        assertEquals(-10,a.getAndSet(this,1));
    }

    /**
     * getAndAdd returns previous value and adds given value
     */
    public void testGetAndAdd() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = 1;
        assertEquals(1,a.getAndAdd(this,2));
        assertEquals(3,a.get(this));
        assertEquals(3,a.getAndAdd(this,-4));
        assertEquals(-1,a.get(this));
    }

    /**
     * getAndDecrement returns previous value and decrements
     */
    public void testGetAndDecrement() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = 1;
        assertEquals(1,a.getAndDecrement(this));
        assertEquals(0,a.getAndDecrement(this));
        assertEquals(-1,a.getAndDecrement(this));
    }

    /**
     * getAndIncrement returns previous value and increments
     */
    public void testGetAndIncrement() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = 1;
        assertEquals(1,a.getAndIncrement(this));
        assertEquals(2,a.get(this));
        a.set(this,-2);
        assertEquals(-2,a.getAndIncrement(this));
        assertEquals(-1,a.getAndIncrement(this));
        assertEquals(0,a.getAndIncrement(this));
        assertEquals(1,a.get(this));
    }

    /**
     * addAndGet adds given value to current, and returns current value
     */
    public void testAddAndGet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = 1;
        assertEquals(3,a.addAndGet(this,2));
        assertEquals(3,a.get(this));
        assertEquals(-1,a.addAndGet(this,-4));
        assertEquals(-1,a.get(this));
    }

    /**
     * decrementAndGet decrements and returns current value
     */
    public void testDecrementAndGet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = 1;
        assertEquals(0,a.decrementAndGet(this));
        assertEquals(-1,a.decrementAndGet(this));
        assertEquals(-2,a.decrementAndGet(this));
        assertEquals(-2,a.get(this));
    }

    /**
     * incrementAndGet increments and returns current value
     */
    public void testIncrementAndGet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        try {
            a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        x = 1;
        assertEquals(2,a.incrementAndGet(this));
        assertEquals(2,a.get(this));
        a.set(this,-2);
        assertEquals(-1,a.incrementAndGet(this));
        assertEquals(0,a.incrementAndGet(this));
        assertEquals(1,a.incrementAndGet(this));
        assertEquals(1,a.get(this));
    }

}
Revision:	1.18
Committed:	Sat Oct 9 19:30:34 2010 UTC (13 years, 7 months ago) by jsr166
Branch:	MAIN
Changes since 1.17:	+4 -4 lines
Log Message:	whitespace
#	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 java.util.concurrent.atomic.*;
10	import junit.framework.*;
11	import java.util.*;
12
13	public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
14	volatile long x = 0;
15	int z;
16	long w;
17
18	public static void main(String[] args) {
19	junit.textui.TestRunner.run(suite());
20	}
21	public static Test suite() {
22	return new TestSuite(AtomicLongFieldUpdaterTest.class);
23	}
24
25	/**
26	* Construction with non-existent field throws RuntimeException
27	*/
28	public void testConstructor() {
29	try {
30	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
31	a = AtomicLongFieldUpdater.newUpdater
32	(AtomicLongFieldUpdaterTest.class, "y");
33	shouldThrow();
34	} catch (RuntimeException success) {}
35	}
36
37	/**
38	* construction with field not of given type throws RuntimeException
39	*/
40	public void testConstructor2() {
41	try {
42	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
43	a = AtomicLongFieldUpdater.newUpdater
44	(AtomicLongFieldUpdaterTest.class, "z");
45	shouldThrow();
46	} catch (RuntimeException success) {}
47	}
48
49	/**
50	* construction with non-volatile field throws RuntimeException
51	*/
52	public void testConstructor3() {
53	try {
54	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
55	a = AtomicLongFieldUpdater.newUpdater
56	(AtomicLongFieldUpdaterTest.class, "w");
57	shouldThrow();
58	} catch (RuntimeException success) {}
59	}
60
61	/**
62	* get returns the last value set or assigned
63	*/
64	public void testGetSet() {
65	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
66	try {
67	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
68	} catch (RuntimeException ok) {
69	return;
70	}
71	x = 1;
72	assertEquals(1,a.get(this));
73	a.set(this,2);
74	assertEquals(2,a.get(this));
75	a.set(this,-3);
76	assertEquals(-3,a.get(this));
77	}
78
79	/**
80	* get returns the last value lazySet by same thread
81	*/
82	public void testGetLazySet() {
83	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
84	try {
85	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
86	} catch (RuntimeException ok) {
87	return;
88	}
89	x = 1;
90	assertEquals(1,a.get(this));
91	a.lazySet(this,2);
92	assertEquals(2,a.get(this));
93	a.lazySet(this,-3);
94	assertEquals(-3,a.get(this));
95	}
96
97
98	/**
99	* compareAndSet succeeds in changing value if equal to expected else fails
100	*/
101	public void testCompareAndSet() {
102	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
103	try {
104	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
105	} catch (RuntimeException ok) {
106	return;
107	}
108	x = 1;
109	assertTrue(a.compareAndSet(this,1,2));
110	assertTrue(a.compareAndSet(this,2,-4));
111	assertEquals(-4,a.get(this));
112	assertFalse(a.compareAndSet(this,-5,7));
113	assertEquals(-4,a.get(this));
114	assertTrue(a.compareAndSet(this,-4,7));
115	assertEquals(7,a.get(this));
116	}
117
118
119	/**
120	* compareAndSet in one thread enables another waiting for value
121	* to succeed
122	*/
123	public void testCompareAndSetInMultipleThreads() throws Exception {
124	x = 1;
125	final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>a;
126	try {
127	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
128	} catch (RuntimeException ok) {
129	return;
130	}
131
132	Thread t = new Thread(new CheckedRunnable() {
133	public void realRun() {
134	while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3))
135	Thread.yield();
136	}});
137
138	t.start();
139	assertTrue(a.compareAndSet(this, 1, 2));
140	t.join(LONG_DELAY_MS);
141	assertFalse(t.isAlive());
142	assertEquals(a.get(this), 3);
143	}
144
145	/**
146	* repeated weakCompareAndSet succeeds in changing value when equal
147	* to expected
148	*/
149	public void testWeakCompareAndSet() {
150	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
151	try {
152	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
153	} catch (RuntimeException ok) {
154	return;
155	}
156	x = 1;
157	while (!a.weakCompareAndSet(this,1,2));
158	while (!a.weakCompareAndSet(this,2,-4));
159	assertEquals(-4,a.get(this));
160	while (!a.weakCompareAndSet(this,-4,7));
161	assertEquals(7,a.get(this));
162	}
163
164	/**
165	* getAndSet returns previous value and sets to given value
166	*/
167	public void testGetAndSet() {
168	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
169	try {
170	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
171	} catch (RuntimeException ok) {
172	return;
173	}
174	x = 1;
175	assertEquals(1,a.getAndSet(this, 0));
176	assertEquals(0,a.getAndSet(this,-10));
177	assertEquals(-10,a.getAndSet(this,1));
178	}
179
180	/**
181	* getAndAdd returns previous value and adds given value
182	*/
183	public void testGetAndAdd() {
184	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
185	try {
186	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
187	} catch (RuntimeException ok) {
188	return;
189	}
190	x = 1;
191	assertEquals(1,a.getAndAdd(this,2));
192	assertEquals(3,a.get(this));
193	assertEquals(3,a.getAndAdd(this,-4));
194	assertEquals(-1,a.get(this));
195	}
196
197	/**
198	* getAndDecrement returns previous value and decrements
199	*/
200	public void testGetAndDecrement() {
201	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
202	try {
203	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
204	} catch (RuntimeException ok) {
205	return;
206	}
207	x = 1;
208	assertEquals(1,a.getAndDecrement(this));
209	assertEquals(0,a.getAndDecrement(this));
210	assertEquals(-1,a.getAndDecrement(this));
211	}
212
213	/**
214	* getAndIncrement returns previous value and increments
215	*/
216	public void testGetAndIncrement() {
217	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
218	try {
219	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
220	} catch (RuntimeException ok) {
221	return;
222	}
223	x = 1;
224	assertEquals(1,a.getAndIncrement(this));
225	assertEquals(2,a.get(this));
226	a.set(this,-2);
227	assertEquals(-2,a.getAndIncrement(this));
228	assertEquals(-1,a.getAndIncrement(this));
229	assertEquals(0,a.getAndIncrement(this));
230	assertEquals(1,a.get(this));
231	}
232
233	/**
234	* addAndGet adds given value to current, and returns current value
235	*/
236	public void testAddAndGet() {
237	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
238	try {
239	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
240	} catch (RuntimeException ok) {
241	return;
242	}
243	x = 1;
244	assertEquals(3,a.addAndGet(this,2));
245	assertEquals(3,a.get(this));
246	assertEquals(-1,a.addAndGet(this,-4));
247	assertEquals(-1,a.get(this));
248	}
249
250	/**
251	* decrementAndGet decrements and returns current value
252	*/
253	public void testDecrementAndGet() {
254	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
255	try {
256	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
257	} catch (RuntimeException ok) {
258	return;
259	}
260	x = 1;
261	assertEquals(0,a.decrementAndGet(this));
262	assertEquals(-1,a.decrementAndGet(this));
263	assertEquals(-2,a.decrementAndGet(this));
264	assertEquals(-2,a.get(this));
265	}
266
267	/**
268	* incrementAndGet increments and returns current value
269	*/
270	public void testIncrementAndGet() {
271	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
272	try {
273	a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
274	} catch (RuntimeException ok) {
275	return;
276	}
277	x = 1;
278	assertEquals(2,a.incrementAndGet(this));
279	assertEquals(2,a.get(this));
280	a.set(this,-2);
281	assertEquals(-1,a.incrementAndGet(this));
282	assertEquals(0,a.incrementAndGet(this));
283	assertEquals(1,a.incrementAndGet(this));
284	assertEquals(1,a.get(this));
285	}
286
287	}