test/tck/AtomicIntegerFieldUpdaterTest.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.AtomicIntegerFieldUpdater;

public class AtomicIntegerFieldUpdaterTest extends JSR166TestCase {
    volatile int x = 0;
    int w;
    long z;
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicIntegerFieldUpdaterTest.class);
    }

    AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> updaterFor(String fieldName) {
        return AtomicIntegerFieldUpdater.newUpdater
            (AtomicIntegerFieldUpdaterTest.class, fieldName);
    }

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

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

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

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

        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                while (!a.compareAndSet(AtomicIntegerFieldUpdaterTest.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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> 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:	1.24
Committed:	Mon Apr 1 20:58:58 2013 UTC (11 years, 1 month ago) by jsr166
Branch:	MAIN
Changes since 1.23:	+21 -70 lines
Log Message:	RuntimeException is not ok for valid fields; refactor a little
#	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.AtomicIntegerFieldUpdater;
11	dl	1.1
12	dl	1.2	public class AtomicIntegerFieldUpdaterTest extends JSR166TestCase {
13	dl	1.1	volatile int x = 0;
14	dl	1.4	int w;
15	dl	1.2	long z;
16	jsr166	1.12	public static void main(String[] args) {
17	dl	1.1	junit.textui.TestRunner.run(suite());
18			}
19			public static Test suite() {
20			return new TestSuite(AtomicIntegerFieldUpdaterTest.class);
21			}
22
23	jsr166	1.24	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> updaterFor(String fieldName) {
24			return AtomicIntegerFieldUpdater.newUpdater
25			(AtomicIntegerFieldUpdaterTest.class, fieldName);
26			}
27
28	dl	1.3	/**
29	dl	1.7	* Construction with non-existent field throws RuntimeException
30	dl	1.3	*/
31			public void testConstructor() {
32	jsr166	1.11	try {
33	jsr166	1.24	updaterFor("y");
34	dl	1.3	shouldThrow();
35	jsr166	1.16	} catch (RuntimeException success) {}
36	dl	1.2	}
37
38	dl	1.3	/**
39	dl	1.4	* construction with field not of given type throws RuntimeException
40	dl	1.3	*/
41			public void testConstructor2() {
42	jsr166	1.11	try {
43	jsr166	1.24	updaterFor("z");
44	dl	1.3	shouldThrow();
45	jsr166	1.16	} catch (RuntimeException success) {}
46	dl	1.1	}
47
48	dl	1.3	/**
49	dl	1.4	* construction with non-volatile field throws RuntimeException
50			*/
51			public void testConstructor3() {
52	jsr166	1.11	try {
53	jsr166	1.24	updaterFor("w");
54	dl	1.4	shouldThrow();
55	jsr166	1.16	} catch (RuntimeException success) {}
56	dl	1.4	}
57
58			/**
59	jsr166	1.18	* get returns the last value set or assigned
60	dl	1.3	*/
61			public void testGetSet() {
62	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
63	jsr166	1.24	a = updaterFor("x");
64	dl	1.1	x = 1;
65	jsr166	1.22	assertEquals(1, a.get(this));
66			a.set(this, 2);
67			assertEquals(2, a.get(this));
68			a.set(this, -3);
69			assertEquals(-3, a.get(this));
70	dl	1.1	}
71	dl	1.9
72			/**
73	jsr166	1.18	* get returns the last value lazySet by same thread
74	dl	1.9	*/
75			public void testGetLazySet() {
76			AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
77	jsr166	1.24	a = updaterFor("x");
78	dl	1.9	x = 1;
79	jsr166	1.22	assertEquals(1, a.get(this));
80			a.lazySet(this, 2);
81			assertEquals(2, a.get(this));
82			a.lazySet(this, -3);
83			assertEquals(-3, a.get(this));
84	dl	1.9	}
85
86	dl	1.3	/**
87	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
88	dl	1.3	*/
89			public void testCompareAndSet() {
90	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
91	jsr166	1.24	a = updaterFor("x");
92	dl	1.1	x = 1;
93	jsr166	1.22	assertTrue(a.compareAndSet(this, 1, 2));
94			assertTrue(a.compareAndSet(this, 2, -4));
95			assertEquals(-4, a.get(this));
96			assertFalse(a.compareAndSet(this, -5, 7));
97			assertEquals(-4, a.get(this));
98			assertTrue(a.compareAndSet(this, -4, 7));
99			assertEquals(7, a.get(this));
100	dl	1.1	}
101
102	dl	1.4	/**
103			* compareAndSet in one thread enables another waiting for value
104			* to succeed
105			*/
106	jsr166	1.13	public void testCompareAndSetInMultipleThreads() throws Exception {
107	dl	1.4	x = 1;
108	jsr166	1.24	final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
109			a = updaterFor("x");
110	dl	1.4
111	jsr166	1.14	Thread t = new Thread(new CheckedRunnable() {
112			public void realRun() {
113			while (!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3))
114			Thread.yield();
115			}});
116	jsr166	1.13
117			t.start();
118			assertTrue(a.compareAndSet(this, 1, 2));
119			t.join(LONG_DELAY_MS);
120			assertFalse(t.isAlive());
121	jsr166	1.23	assertEquals(3, a.get(this));
122	dl	1.4	}
123
124	dl	1.3	/**
125	dl	1.4	* repeated weakCompareAndSet succeeds in changing value when equal
126	jsr166	1.10	* to expected
127	dl	1.3	*/
128			public void testWeakCompareAndSet() {
129	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
130	jsr166	1.24	a = updaterFor("x");
131	dl	1.1	x = 1;
132	jsr166	1.22	while (!a.weakCompareAndSet(this, 1, 2));
133			while (!a.weakCompareAndSet(this, 2, -4));
134			assertEquals(-4, a.get(this));
135			while (!a.weakCompareAndSet(this, -4, 7));
136			assertEquals(7, a.get(this));
137	dl	1.1	}
138
139	dl	1.3	/**
140	jsr166	1.18	* getAndSet returns previous value and sets to given value
141	dl	1.3	*/
142			public void testGetAndSet() {
143	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
144	jsr166	1.24	a = updaterFor("x");
145	dl	1.1	x = 1;
146	jsr166	1.22	assertEquals(1, a.getAndSet(this, 0));
147			assertEquals(0, a.getAndSet(this, -10));
148			assertEquals(-10, a.getAndSet(this, 1));
149	dl	1.1	}
150
151	dl	1.3	/**
152	dl	1.4	* getAndAdd returns previous value and adds given value
153	dl	1.3	*/
154			public void testGetAndAdd() {
155	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
156	jsr166	1.24	a = updaterFor("x");
157	dl	1.1	x = 1;
158	jsr166	1.22	assertEquals(1, a.getAndAdd(this, 2));
159			assertEquals(3, a.get(this));
160			assertEquals(3, a.getAndAdd(this, -4));
161			assertEquals(-1, a.get(this));
162	dl	1.1	}
163
164	dl	1.3	/**
165	dl	1.4	* getAndDecrement returns previous value and decrements
166	dl	1.3	*/
167			public void testGetAndDecrement() {
168	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
169	jsr166	1.24	a = updaterFor("x");
170	dl	1.1	x = 1;
171	jsr166	1.22	assertEquals(1, a.getAndDecrement(this));
172			assertEquals(0, a.getAndDecrement(this));
173			assertEquals(-1, a.getAndDecrement(this));
174	dl	1.1	}
175
176	dl	1.3	/**
177	dl	1.4	* getAndIncrement returns previous value and increments
178	dl	1.3	*/
179			public void testGetAndIncrement() {
180	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
181	jsr166	1.24	a = updaterFor("x");
182	dl	1.1	x = 1;
183	jsr166	1.22	assertEquals(1, a.getAndIncrement(this));
184			assertEquals(2, a.get(this));
185			a.set(this, -2);
186			assertEquals(-2, a.getAndIncrement(this));
187			assertEquals(-1, a.getAndIncrement(this));
188			assertEquals(0, a.getAndIncrement(this));
189			assertEquals(1, a.get(this));
190	dl	1.1	}
191
192	dl	1.3	/**
193	dl	1.4	* addAndGet adds given value to current, and returns current value
194	dl	1.3	*/
195			public void testAddAndGet() {
196	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
197	jsr166	1.24	a = updaterFor("x");
198	dl	1.1	x = 1;
199	jsr166	1.22	assertEquals(3, a.addAndGet(this, 2));
200			assertEquals(3, a.get(this));
201			assertEquals(-1, a.addAndGet(this, -4));
202			assertEquals(-1, a.get(this));
203	dl	1.1	}
204
205	dl	1.3	/**
206	dl	1.4	* decrementAndGet decrements and returns current value
207	dl	1.3	*/
208			public void testDecrementAndGet() {
209	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
210	jsr166	1.24	a = updaterFor("x");
211	dl	1.1	x = 1;
212	jsr166	1.22	assertEquals(0, a.decrementAndGet(this));
213			assertEquals(-1, a.decrementAndGet(this));
214			assertEquals(-2, a.decrementAndGet(this));
215			assertEquals(-2, a.get(this));
216	dl	1.1	}
217
218	dl	1.3	/**
219	dl	1.4	* incrementAndGet increments and returns current value
220	dl	1.3	*/
221			public void testIncrementAndGet() {
222	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
223	jsr166	1.24	a = updaterFor("x");
224	dl	1.1	x = 1;
225	jsr166	1.22	assertEquals(2, a.incrementAndGet(this));
226			assertEquals(2, a.get(this));
227			a.set(this, -2);
228			assertEquals(-1, a.incrementAndGet(this));
229			assertEquals(0, a.incrementAndGet(this));
230			assertEquals(1, a.incrementAndGet(this));
231			assertEquals(1, a.get(this));
232	dl	1.1	}
233
234			}