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 java.util.concurrent.atomic.AtomicLongFieldUpdater;

import junit.framework.Test;
import junit.framework.TestSuite;

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) {
            assertNotNull(success.getCause());
        }
    }

    /**
     * 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:	1.27
Committed:	Wed Dec 31 19:05:42 2014 UTC (9 years, 4 months ago) by jsr166
Branch:	MAIN
Changes since 1.26:	+3 -1 lines
Log Message:	no wildcard imports
#	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	jsr166	1.21	import java.util.concurrent.atomic.AtomicLongFieldUpdater;
10	dl	1.1
11	jsr166	1.27	import junit.framework.Test;
12			import junit.framework.TestSuite;
13
14	dl	1.2	public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
15	dl	1.1	volatile long x = 0;
16	dl	1.4	int z;
17			long w;
18	dl	1.1
19	jsr166	1.12	public static void main(String[] args) {
20	dl	1.1	junit.textui.TestRunner.run(suite());
21			}
22			public static Test suite() {
23			return new TestSuite(AtomicLongFieldUpdaterTest.class);
24			}
25
26	jsr166	1.24	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) {
27			return AtomicLongFieldUpdater.newUpdater
28			(AtomicLongFieldUpdaterTest.class, fieldName);
29			}
30
31	dl	1.3	/**
32	dl	1.7	* Construction with non-existent field throws RuntimeException
33	dl	1.3	*/
34	jsr166	1.12	public void testConstructor() {
35	jsr166	1.11	try {
36	jsr166	1.24	updaterFor("y");
37	dl	1.3	shouldThrow();
38	jsr166	1.25	} catch (RuntimeException success) {
39	jsr166	1.26	assertNotNull(success.getCause());
40	jsr166	1.25	}
41	dl	1.1	}
42
43	dl	1.3	/**
44	jsr166	1.25	* construction with field not of given type throws IllegalArgumentException
45	dl	1.3	*/
46	jsr166	1.12	public void testConstructor2() {
47	jsr166	1.11	try {
48	jsr166	1.24	updaterFor("z");
49	dl	1.3	shouldThrow();
50	jsr166	1.25	} catch (IllegalArgumentException success) {}
51	dl	1.1	}
52
53	dl	1.3	/**
54	jsr166	1.25	* construction with non-volatile field throws IllegalArgumentException
55	dl	1.3	*/
56	jsr166	1.12	public void testConstructor3() {
57	jsr166	1.11	try {
58	jsr166	1.24	updaterFor("w");
59	dl	1.3	shouldThrow();
60	jsr166	1.25	} catch (IllegalArgumentException success) {}
61	dl	1.1	}
62
63	dl	1.3	/**
64	jsr166	1.18	* get returns the last value set or assigned
65	dl	1.3	*/
66	jsr166	1.12	public void testGetSet() {
67	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
68	jsr166	1.24	a = updaterFor("x");
69	dl	1.1	x = 1;
70	jsr166	1.22	assertEquals(1, a.get(this));
71			a.set(this, 2);
72			assertEquals(2, a.get(this));
73			a.set(this, -3);
74			assertEquals(-3, a.get(this));
75	dl	1.1	}
76	dl	1.9
77			/**
78	jsr166	1.18	* get returns the last value lazySet by same thread
79	dl	1.9	*/
80	jsr166	1.12	public void testGetLazySet() {
81	dl	1.9	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
82	jsr166	1.24	a = updaterFor("x");
83	dl	1.9	x = 1;
84	jsr166	1.22	assertEquals(1, a.get(this));
85			a.lazySet(this, 2);
86			assertEquals(2, a.get(this));
87			a.lazySet(this, -3);
88			assertEquals(-3, a.get(this));
89	dl	1.9	}
90
91	dl	1.3	/**
92	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
93	dl	1.3	*/
94	jsr166	1.12	public void testCompareAndSet() {
95	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
96	jsr166	1.24	a = updaterFor("x");
97	dl	1.1	x = 1;
98	jsr166	1.22	assertTrue(a.compareAndSet(this, 1, 2));
99			assertTrue(a.compareAndSet(this, 2, -4));
100			assertEquals(-4, a.get(this));
101			assertFalse(a.compareAndSet(this, -5, 7));
102			assertEquals(-4, a.get(this));
103			assertTrue(a.compareAndSet(this, -4, 7));
104			assertEquals(7, a.get(this));
105	dl	1.1	}
106
107	dl	1.4	/**
108			* compareAndSet in one thread enables another waiting for value
109			* to succeed
110			*/
111	jsr166	1.13	public void testCompareAndSetInMultipleThreads() throws Exception {
112	dl	1.4	x = 1;
113	jsr166	1.24	final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
114			a = updaterFor("x");
115	dl	1.4
116	jsr166	1.14	Thread t = new Thread(new CheckedRunnable() {
117			public void realRun() {
118			while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3))
119			Thread.yield();
120			}});
121	jsr166	1.13
122			t.start();
123			assertTrue(a.compareAndSet(this, 1, 2));
124			t.join(LONG_DELAY_MS);
125			assertFalse(t.isAlive());
126	jsr166	1.23	assertEquals(3, a.get(this));
127	dl	1.4	}
128
129	dl	1.3	/**
130	dl	1.4	* repeated weakCompareAndSet succeeds in changing value when equal
131	jsr166	1.10	* to expected
132	dl	1.3	*/
133	jsr166	1.12	public void testWeakCompareAndSet() {
134	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
135	jsr166	1.24	a = updaterFor("x");
136	dl	1.1	x = 1;
137	jsr166	1.22	while (!a.weakCompareAndSet(this, 1, 2));
138			while (!a.weakCompareAndSet(this, 2, -4));
139			assertEquals(-4, a.get(this));
140			while (!a.weakCompareAndSet(this, -4, 7));
141			assertEquals(7, a.get(this));
142	dl	1.1	}
143
144	dl	1.3	/**
145	jsr166	1.18	* getAndSet returns previous value and sets to given value
146	dl	1.3	*/
147	jsr166	1.12	public void testGetAndSet() {
148	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
149	jsr166	1.24	a = updaterFor("x");
150	dl	1.1	x = 1;
151	jsr166	1.22	assertEquals(1, a.getAndSet(this, 0));
152			assertEquals(0, a.getAndSet(this, -10));
153			assertEquals(-10, a.getAndSet(this, 1));
154	dl	1.1	}
155
156	dl	1.3	/**
157	dl	1.4	* getAndAdd returns previous value and adds given value
158	dl	1.3	*/
159	jsr166	1.12	public void testGetAndAdd() {
160	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
161	jsr166	1.24	a = updaterFor("x");
162	dl	1.1	x = 1;
163	jsr166	1.22	assertEquals(1, a.getAndAdd(this, 2));
164			assertEquals(3, a.get(this));
165			assertEquals(3, a.getAndAdd(this, -4));
166			assertEquals(-1, a.get(this));
167	dl	1.1	}
168
169	dl	1.3	/**
170	dl	1.4	* getAndDecrement returns previous value and decrements
171	dl	1.3	*/
172	jsr166	1.12	public void testGetAndDecrement() {
173	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
174	jsr166	1.24	a = updaterFor("x");
175	dl	1.1	x = 1;
176	jsr166	1.22	assertEquals(1, a.getAndDecrement(this));
177			assertEquals(0, a.getAndDecrement(this));
178			assertEquals(-1, a.getAndDecrement(this));
179	dl	1.1	}
180
181	dl	1.3	/**
182	dl	1.4	* getAndIncrement returns previous value and increments
183	dl	1.3	*/
184	jsr166	1.12	public void testGetAndIncrement() {
185	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
186	jsr166	1.24	a = updaterFor("x");
187	dl	1.1	x = 1;
188	jsr166	1.22	assertEquals(1, a.getAndIncrement(this));
189			assertEquals(2, a.get(this));
190			a.set(this, -2);
191			assertEquals(-2, a.getAndIncrement(this));
192			assertEquals(-1, a.getAndIncrement(this));
193			assertEquals(0, a.getAndIncrement(this));
194			assertEquals(1, a.get(this));
195	dl	1.1	}
196
197	dl	1.3	/**
198	dl	1.4	* addAndGet adds given value to current, and returns current value
199	dl	1.3	*/
200	jsr166	1.12	public void testAddAndGet() {
201	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
202	jsr166	1.24	a = updaterFor("x");
203	dl	1.1	x = 1;
204	jsr166	1.22	assertEquals(3, a.addAndGet(this, 2));
205			assertEquals(3, a.get(this));
206			assertEquals(-1, a.addAndGet(this, -4));
207			assertEquals(-1, a.get(this));
208	dl	1.1	}
209
210	dl	1.3	/**
211	jsr166	1.18	* decrementAndGet decrements and returns current value
212	dl	1.3	*/
213	jsr166	1.12	public void testDecrementAndGet() {
214	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
215	jsr166	1.24	a = updaterFor("x");
216	dl	1.1	x = 1;
217	jsr166	1.22	assertEquals(0, a.decrementAndGet(this));
218			assertEquals(-1, a.decrementAndGet(this));
219			assertEquals(-2, a.decrementAndGet(this));
220			assertEquals(-2, a.get(this));
221	dl	1.1	}
222
223	dl	1.3	/**
224	dl	1.4	* incrementAndGet increments and returns current value
225	dl	1.3	*/
226	jsr166	1.12	public void testIncrementAndGet() {
227	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
228	jsr166	1.24	a = updaterFor("x");
229	dl	1.1	x = 1;
230	jsr166	1.22	assertEquals(2, a.incrementAndGet(this));
231			assertEquals(2, a.get(this));
232			a.set(this, -2);
233			assertEquals(-1, a.incrementAndGet(this));
234			assertEquals(0, a.incrementAndGet(this));
235			assertEquals(1, a.incrementAndGet(this));
236			assertEquals(1, a.get(this));
237	dl	1.1	}
238
239			}