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/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.*;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;

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);
    }

    AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) {
        return AtomicLongFieldUpdater.newUpdater
            (AtomicLongFieldUpdaterTest.class, fieldName);
    }

    /**
     * Construction with non-existent field throws RuntimeException
     */
    public void testConstructor() {
        try {
            updaterFor("y");
            shouldThrow();
        } catch (RuntimeException success) {
            assertTrue(success.getCause() != null);
        }
    }

    /**
     * construction with field not of given type throws IllegalArgumentException
     */
    public void testConstructor2() {
        try {
            updaterFor("z");
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * construction with non-volatile field throws IllegalArgumentException
     */
    public void testConstructor3() {
        try {
            updaterFor("w");
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * get returns the last value set or assigned
     */
    public void testGetSet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");

        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(3, a.get(this));
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSet() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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;
        a = updaterFor("x");
        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:	1.25
Committed:	Tue Apr 2 04:11:28 2013 UTC (11 years, 1 month ago) by jsr166
Branch:	MAIN
Changes since 1.24:	+7 -5 lines
Log Message:	tighten tests to match specs
#	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	jsr166	1.19	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.10	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9			import junit.framework.*;
10	jsr166	1.21	import java.util.concurrent.atomic.AtomicLongFieldUpdater;
11	dl	1.1
12	dl	1.2	public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
13	dl	1.1	volatile long x = 0;
14	dl	1.4	int z;
15			long w;
16	dl	1.1
17	jsr166	1.12	public static void main(String[] args) {
18	dl	1.1	junit.textui.TestRunner.run(suite());
19			}
20			public static Test suite() {
21			return new TestSuite(AtomicLongFieldUpdaterTest.class);
22			}
23
24	jsr166	1.24	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) {
25			return AtomicLongFieldUpdater.newUpdater
26			(AtomicLongFieldUpdaterTest.class, fieldName);
27			}
28
29	dl	1.3	/**
30	dl	1.7	* Construction with non-existent field throws RuntimeException
31	dl	1.3	*/
32	jsr166	1.12	public void testConstructor() {
33	jsr166	1.11	try {
34	jsr166	1.24	updaterFor("y");
35	dl	1.3	shouldThrow();
36	jsr166	1.25	} catch (RuntimeException success) {
37			assertTrue(success.getCause() != null);
38			}
39	dl	1.1	}
40
41	dl	1.3	/**
42	jsr166	1.25	* construction with field not of given type throws IllegalArgumentException
43	dl	1.3	*/
44	jsr166	1.12	public void testConstructor2() {
45	jsr166	1.11	try {
46	jsr166	1.24	updaterFor("z");
47	dl	1.3	shouldThrow();
48	jsr166	1.25	} catch (IllegalArgumentException success) {}
49	dl	1.1	}
50
51	dl	1.3	/**
52	jsr166	1.25	* construction with non-volatile field throws IllegalArgumentException
53	dl	1.3	*/
54	jsr166	1.12	public void testConstructor3() {
55	jsr166	1.11	try {
56	jsr166	1.24	updaterFor("w");
57	dl	1.3	shouldThrow();
58	jsr166	1.25	} catch (IllegalArgumentException success) {}
59	dl	1.1	}
60
61	dl	1.3	/**
62	jsr166	1.18	* get returns the last value set or assigned
63	dl	1.3	*/
64	jsr166	1.12	public void testGetSet() {
65	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
66	jsr166	1.24	a = updaterFor("x");
67	dl	1.1	x = 1;
68	jsr166	1.22	assertEquals(1, a.get(this));
69			a.set(this, 2);
70			assertEquals(2, a.get(this));
71			a.set(this, -3);
72			assertEquals(-3, a.get(this));
73	dl	1.1	}
74	dl	1.9
75			/**
76	jsr166	1.18	* get returns the last value lazySet by same thread
77	dl	1.9	*/
78	jsr166	1.12	public void testGetLazySet() {
79	dl	1.9	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
80	jsr166	1.24	a = updaterFor("x");
81	dl	1.9	x = 1;
82	jsr166	1.22	assertEquals(1, a.get(this));
83			a.lazySet(this, 2);
84			assertEquals(2, a.get(this));
85			a.lazySet(this, -3);
86			assertEquals(-3, a.get(this));
87	dl	1.9	}
88
89	dl	1.3	/**
90	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
91	dl	1.3	*/
92	jsr166	1.12	public void testCompareAndSet() {
93	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
94	jsr166	1.24	a = updaterFor("x");
95	dl	1.1	x = 1;
96	jsr166	1.22	assertTrue(a.compareAndSet(this, 1, 2));
97			assertTrue(a.compareAndSet(this, 2, -4));
98			assertEquals(-4, a.get(this));
99			assertFalse(a.compareAndSet(this, -5, 7));
100			assertEquals(-4, a.get(this));
101			assertTrue(a.compareAndSet(this, -4, 7));
102			assertEquals(7, a.get(this));
103	dl	1.1	}
104
105	dl	1.4	/**
106			* compareAndSet in one thread enables another waiting for value
107			* to succeed
108			*/
109	jsr166	1.13	public void testCompareAndSetInMultipleThreads() throws Exception {
110	dl	1.4	x = 1;
111	jsr166	1.24	final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
112			a = updaterFor("x");
113	dl	1.4
114	jsr166	1.14	Thread t = new Thread(new CheckedRunnable() {
115			public void realRun() {
116			while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3))
117			Thread.yield();
118			}});
119	jsr166	1.13
120			t.start();
121			assertTrue(a.compareAndSet(this, 1, 2));
122			t.join(LONG_DELAY_MS);
123			assertFalse(t.isAlive());
124	jsr166	1.23	assertEquals(3, a.get(this));
125	dl	1.4	}
126
127	dl	1.3	/**
128	dl	1.4	* repeated weakCompareAndSet succeeds in changing value when equal
129	jsr166	1.10	* to expected
130	dl	1.3	*/
131	jsr166	1.12	public void testWeakCompareAndSet() {
132	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
133	jsr166	1.24	a = updaterFor("x");
134	dl	1.1	x = 1;
135	jsr166	1.22	while (!a.weakCompareAndSet(this, 1, 2));
136			while (!a.weakCompareAndSet(this, 2, -4));
137			assertEquals(-4, a.get(this));
138			while (!a.weakCompareAndSet(this, -4, 7));
139			assertEquals(7, a.get(this));
140	dl	1.1	}
141
142	dl	1.3	/**
143	jsr166	1.18	* getAndSet returns previous value and sets to given value
144	dl	1.3	*/
145	jsr166	1.12	public void testGetAndSet() {
146	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
147	jsr166	1.24	a = updaterFor("x");
148	dl	1.1	x = 1;
149	jsr166	1.22	assertEquals(1, a.getAndSet(this, 0));
150			assertEquals(0, a.getAndSet(this, -10));
151			assertEquals(-10, a.getAndSet(this, 1));
152	dl	1.1	}
153
154	dl	1.3	/**
155	dl	1.4	* getAndAdd returns previous value and adds given value
156	dl	1.3	*/
157	jsr166	1.12	public void testGetAndAdd() {
158	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
159	jsr166	1.24	a = updaterFor("x");
160	dl	1.1	x = 1;
161	jsr166	1.22	assertEquals(1, a.getAndAdd(this, 2));
162			assertEquals(3, a.get(this));
163			assertEquals(3, a.getAndAdd(this, -4));
164			assertEquals(-1, a.get(this));
165	dl	1.1	}
166
167	dl	1.3	/**
168	dl	1.4	* getAndDecrement returns previous value and decrements
169	dl	1.3	*/
170	jsr166	1.12	public void testGetAndDecrement() {
171	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
172	jsr166	1.24	a = updaterFor("x");
173	dl	1.1	x = 1;
174	jsr166	1.22	assertEquals(1, a.getAndDecrement(this));
175			assertEquals(0, a.getAndDecrement(this));
176			assertEquals(-1, a.getAndDecrement(this));
177	dl	1.1	}
178
179	dl	1.3	/**
180	dl	1.4	* getAndIncrement returns previous value and increments
181	dl	1.3	*/
182	jsr166	1.12	public void testGetAndIncrement() {
183	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
184	jsr166	1.24	a = updaterFor("x");
185	dl	1.1	x = 1;
186	jsr166	1.22	assertEquals(1, a.getAndIncrement(this));
187			assertEquals(2, a.get(this));
188			a.set(this, -2);
189			assertEquals(-2, a.getAndIncrement(this));
190			assertEquals(-1, a.getAndIncrement(this));
191			assertEquals(0, a.getAndIncrement(this));
192			assertEquals(1, a.get(this));
193	dl	1.1	}
194
195	dl	1.3	/**
196	dl	1.4	* addAndGet adds given value to current, and returns current value
197	dl	1.3	*/
198	jsr166	1.12	public void testAddAndGet() {
199	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
200	jsr166	1.24	a = updaterFor("x");
201	dl	1.1	x = 1;
202	jsr166	1.22	assertEquals(3, a.addAndGet(this, 2));
203			assertEquals(3, a.get(this));
204			assertEquals(-1, a.addAndGet(this, -4));
205			assertEquals(-1, a.get(this));
206	dl	1.1	}
207
208	dl	1.3	/**
209	jsr166	1.18	* decrementAndGet decrements and returns current value
210	dl	1.3	*/
211	jsr166	1.12	public void testDecrementAndGet() {
212	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
213	jsr166	1.24	a = updaterFor("x");
214	dl	1.1	x = 1;
215	jsr166	1.22	assertEquals(0, a.decrementAndGet(this));
216			assertEquals(-1, a.decrementAndGet(this));
217			assertEquals(-2, a.decrementAndGet(this));
218			assertEquals(-2, a.get(this));
219	dl	1.1	}
220
221	dl	1.3	/**
222	dl	1.4	* incrementAndGet increments and returns current value
223	dl	1.3	*/
224	jsr166	1.12	public void testIncrementAndGet() {
225	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
226	jsr166	1.24	a = updaterFor("x");
227	dl	1.1	x = 1;
228	jsr166	1.22	assertEquals(2, a.incrementAndGet(this));
229			assertEquals(2, a.get(this));
230			a.set(this, -2);
231			assertEquals(-1, a.incrementAndGet(this));
232			assertEquals(0, a.incrementAndGet(this));
233			assertEquals(1, a.incrementAndGet(this));
234			assertEquals(1, a.get(this));
235	dl	1.1	}
236
237			}