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;
    protected volatile long protectedField;
    private volatile long privateField;
    long w;
    float z;
    public static void main(String[] args) {
        main(suite(), args);
    }
    public static Test suite() {
        return new TestSuite(AtomicLongFieldUpdaterTest.class);
    }

    // for testing subclass access
    static class AtomicLongFieldUpdaterTestSubclass extends AtomicLongFieldUpdaterTest {
        public void checkPrivateAccess() {
            try {
                AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
                    AtomicLongFieldUpdater.newUpdater
                    (AtomicLongFieldUpdaterTest.class, "privateField");
                shouldThrow();
            } catch (RuntimeException success) {
                assertNotNull(success.getCause());
            }
        }

        public void checkCompareAndSetProtectedSub() {
            AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
            a = updaterFor("protectedField");
            protectedField = 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));
        }
    }

    static class UnrelatedClass {
        public void checkPackageAccess(AtomicLongFieldUpdaterTest obj) {
            obj.x = 72L;
            AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
                AtomicLongFieldUpdater.newUpdater
                (AtomicLongFieldUpdaterTest.class, "x");
            assertEquals(72L, a.get(obj));
            assertTrue(a.compareAndSet(obj, 72L, 73L));
            assertEquals(73L, a.get(obj));
        }

        public void checkPrivateAccess(AtomicLongFieldUpdaterTest obj) {
            try {
                AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
                    AtomicLongFieldUpdater.newUpdater
                    (AtomicLongFieldUpdaterTest.class, "privateField");
                throw new AssertionError("should throw");
            } catch (RuntimeException success) {
                assertNotNull(success.getCause());
            }
        }
    }

    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) {}
    }

    /**
     * construction using private field from subclass throws RuntimeException
     */
    public void testPrivateFieldInSubclass() {
        AtomicLongFieldUpdaterTestSubclass s =
            new AtomicLongFieldUpdaterTestSubclass();
        s.checkPrivateAccess();
    }

    /**
     * construction from unrelated class; package access is allowed,
     * private access is not
     */
    public void testUnrelatedClassAccess() {
        new UnrelatedClass().checkPackageAccess(this);
        new UnrelatedClass().checkPrivateAccess(this);
    }

    /**
     * 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 succeeds in changing protected field value if
     * equal to expected else fails
     */
    public void testCompareAndSetProtected() {
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
        a = updaterFor("protectedField");
        protectedField = 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 succeeds in changing protected field value if
     * equal to expected else fails
     */
    public void testCompareAndSetProtectedInSubclass() {
        AtomicLongFieldUpdaterTestSubclass s =
            new AtomicLongFieldUpdaterTestSubclass();
        s.checkCompareAndSetProtectedSub();
    }

    /**
     * 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;
        do {} while (!a.weakCompareAndSet(this, 1, 2));
        do {} while (!a.weakCompareAndSet(this, 2, -4));
        assertEquals(-4, a.get(this));
        do {} 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:	1.31
Committed:	Mon Nov 9 07:54:28 2015 UTC (8 years, 6 months ago) by jsr166
Branch:	MAIN
Changes since 1.30:	+19 -9 lines
Log Message:	improve "UnrelatedClass" tests
#	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	1.30	protected volatile long protectedField;
17			private volatile long privateField;
18	dl	1.4	long w;
19	dl	1.30	float z;
20	jsr166	1.12	public static void main(String[] args) {
21	jsr166	1.29	main(suite(), args);
22	dl	1.1	}
23			public static Test suite() {
24			return new TestSuite(AtomicLongFieldUpdaterTest.class);
25			}
26
27	dl	1.30	// for testing subclass access
28			static class AtomicLongFieldUpdaterTestSubclass extends AtomicLongFieldUpdaterTest {
29			public void checkPrivateAccess() {
30			try {
31			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
32			AtomicLongFieldUpdater.newUpdater
33			(AtomicLongFieldUpdaterTest.class, "privateField");
34			shouldThrow();
35			} catch (RuntimeException success) {
36			assertNotNull(success.getCause());
37			}
38			}
39
40			public void checkCompareAndSetProtectedSub() {
41			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
42			a = updaterFor("protectedField");
43			protectedField = 1;
44			assertTrue(a.compareAndSet(this, 1, 2));
45			assertTrue(a.compareAndSet(this, 2, -4));
46			assertEquals(-4, a.get(this));
47			assertFalse(a.compareAndSet(this, -5, 7));
48			assertEquals(-4, a.get(this));
49			assertTrue(a.compareAndSet(this, -4, 7));
50			assertEquals(7, a.get(this));
51			}
52			}
53
54			static class UnrelatedClass {
55	jsr166	1.31	public void checkPackageAccess(AtomicLongFieldUpdaterTest obj) {
56			obj.x = 72L;
57			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
58			AtomicLongFieldUpdater.newUpdater
59			(AtomicLongFieldUpdaterTest.class, "x");
60			assertEquals(72L, a.get(obj));
61			assertTrue(a.compareAndSet(obj, 72L, 73L));
62			assertEquals(73L, a.get(obj));
63			}
64
65			public void checkPrivateAccess(AtomicLongFieldUpdaterTest obj) {
66	dl	1.30	try {
67			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a =
68			AtomicLongFieldUpdater.newUpdater
69	jsr166	1.31	(AtomicLongFieldUpdaterTest.class, "privateField");
70			throw new AssertionError("should throw");
71			} catch (RuntimeException success) {
72			assertNotNull(success.getCause());
73	dl	1.30	}
74			}
75			}
76
77	jsr166	1.24	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) {
78			return AtomicLongFieldUpdater.newUpdater
79			(AtomicLongFieldUpdaterTest.class, fieldName);
80			}
81
82	dl	1.3	/**
83	dl	1.7	* Construction with non-existent field throws RuntimeException
84	dl	1.3	*/
85	jsr166	1.12	public void testConstructor() {
86	jsr166	1.11	try {
87	jsr166	1.24	updaterFor("y");
88	dl	1.3	shouldThrow();
89	jsr166	1.25	} catch (RuntimeException success) {
90	jsr166	1.26	assertNotNull(success.getCause());
91	jsr166	1.25	}
92	dl	1.1	}
93
94	dl	1.3	/**
95	jsr166	1.25	* construction with field not of given type throws IllegalArgumentException
96	dl	1.3	*/
97	jsr166	1.12	public void testConstructor2() {
98	jsr166	1.11	try {
99	jsr166	1.24	updaterFor("z");
100	dl	1.3	shouldThrow();
101	jsr166	1.25	} catch (IllegalArgumentException success) {}
102	dl	1.1	}
103
104	dl	1.3	/**
105	jsr166	1.25	* construction with non-volatile field throws IllegalArgumentException
106	dl	1.3	*/
107	jsr166	1.12	public void testConstructor3() {
108	jsr166	1.11	try {
109	jsr166	1.24	updaterFor("w");
110	dl	1.3	shouldThrow();
111	jsr166	1.25	} catch (IllegalArgumentException success) {}
112	dl	1.1	}
113
114	dl	1.3	/**
115	dl	1.30	* construction using private field from subclass throws RuntimeException
116			*/
117			public void testPrivateFieldInSubclass() {
118			AtomicLongFieldUpdaterTestSubclass s =
119			new AtomicLongFieldUpdaterTestSubclass();
120			s.checkPrivateAccess();
121			}
122
123			/**
124	jsr166	1.31	* construction from unrelated class; package access is allowed,
125			* private access is not
126	dl	1.30	*/
127			public void testUnrelatedClassAccess() {
128	jsr166	1.31	new UnrelatedClass().checkPackageAccess(this);
129			new UnrelatedClass().checkPrivateAccess(this);
130	dl	1.30	}
131
132			/**
133	jsr166	1.18	* get returns the last value set or assigned
134	dl	1.3	*/
135	jsr166	1.12	public void testGetSet() {
136	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
137	jsr166	1.24	a = updaterFor("x");
138	dl	1.1	x = 1;
139	jsr166	1.22	assertEquals(1, a.get(this));
140			a.set(this, 2);
141			assertEquals(2, a.get(this));
142			a.set(this, -3);
143			assertEquals(-3, a.get(this));
144	dl	1.1	}
145	dl	1.9
146			/**
147	jsr166	1.18	* get returns the last value lazySet by same thread
148	dl	1.9	*/
149	jsr166	1.12	public void testGetLazySet() {
150	dl	1.9	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
151	jsr166	1.24	a = updaterFor("x");
152	dl	1.9	x = 1;
153	jsr166	1.22	assertEquals(1, a.get(this));
154			a.lazySet(this, 2);
155			assertEquals(2, a.get(this));
156			a.lazySet(this, -3);
157			assertEquals(-3, a.get(this));
158	dl	1.9	}
159
160	dl	1.3	/**
161	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
162	dl	1.3	*/
163	jsr166	1.12	public void testCompareAndSet() {
164	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
165	jsr166	1.24	a = updaterFor("x");
166	dl	1.1	x = 1;
167	jsr166	1.22	assertTrue(a.compareAndSet(this, 1, 2));
168			assertTrue(a.compareAndSet(this, 2, -4));
169			assertEquals(-4, a.get(this));
170			assertFalse(a.compareAndSet(this, -5, 7));
171			assertEquals(-4, a.get(this));
172			assertTrue(a.compareAndSet(this, -4, 7));
173			assertEquals(7, a.get(this));
174	dl	1.1	}
175
176	dl	1.4	/**
177	dl	1.30	* compareAndSet succeeds in changing protected field value if
178			* equal to expected else fails
179			*/
180			public void testCompareAndSetProtected() {
181			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
182			a = updaterFor("protectedField");
183			protectedField = 1;
184			assertTrue(a.compareAndSet(this, 1, 2));
185			assertTrue(a.compareAndSet(this, 2, -4));
186			assertEquals(-4, a.get(this));
187			assertFalse(a.compareAndSet(this, -5, 7));
188			assertEquals(-4, a.get(this));
189			assertTrue(a.compareAndSet(this, -4, 7));
190			assertEquals(7, a.get(this));
191			}
192
193			/**
194			* compareAndSet succeeds in changing protected field value if
195			* equal to expected else fails
196			*/
197			public void testCompareAndSetProtectedInSubclass() {
198			AtomicLongFieldUpdaterTestSubclass s =
199			new AtomicLongFieldUpdaterTestSubclass();
200			s.checkCompareAndSetProtectedSub();
201			}
202
203			/**
204	dl	1.4	* compareAndSet in one thread enables another waiting for value
205			* to succeed
206			*/
207	jsr166	1.13	public void testCompareAndSetInMultipleThreads() throws Exception {
208	dl	1.4	x = 1;
209	jsr166	1.24	final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
210			a = updaterFor("x");
211	dl	1.4
212	jsr166	1.14	Thread t = new Thread(new CheckedRunnable() {
213			public void realRun() {
214			while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3))
215			Thread.yield();
216			}});
217	jsr166	1.13
218			t.start();
219			assertTrue(a.compareAndSet(this, 1, 2));
220			t.join(LONG_DELAY_MS);
221			assertFalse(t.isAlive());
222	jsr166	1.23	assertEquals(3, a.get(this));
223	dl	1.4	}
224
225	dl	1.3	/**
226	dl	1.4	* repeated weakCompareAndSet succeeds in changing value when equal
227	jsr166	1.10	* to expected
228	dl	1.3	*/
229	jsr166	1.12	public void testWeakCompareAndSet() {
230	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
231	jsr166	1.24	a = updaterFor("x");
232	dl	1.1	x = 1;
233	jsr166	1.28	do {} while (!a.weakCompareAndSet(this, 1, 2));
234			do {} while (!a.weakCompareAndSet(this, 2, -4));
235	jsr166	1.22	assertEquals(-4, a.get(this));
236	jsr166	1.28	do {} while (!a.weakCompareAndSet(this, -4, 7));
237	jsr166	1.22	assertEquals(7, a.get(this));
238	dl	1.1	}
239
240	dl	1.3	/**
241	jsr166	1.18	* getAndSet returns previous value and sets to given value
242	dl	1.3	*/
243	jsr166	1.12	public void testGetAndSet() {
244	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
245	jsr166	1.24	a = updaterFor("x");
246	dl	1.1	x = 1;
247	jsr166	1.22	assertEquals(1, a.getAndSet(this, 0));
248			assertEquals(0, a.getAndSet(this, -10));
249			assertEquals(-10, a.getAndSet(this, 1));
250	dl	1.1	}
251
252	dl	1.3	/**
253	dl	1.4	* getAndAdd returns previous value and adds given value
254	dl	1.3	*/
255	jsr166	1.12	public void testGetAndAdd() {
256	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
257	jsr166	1.24	a = updaterFor("x");
258	dl	1.1	x = 1;
259	jsr166	1.22	assertEquals(1, a.getAndAdd(this, 2));
260			assertEquals(3, a.get(this));
261			assertEquals(3, a.getAndAdd(this, -4));
262			assertEquals(-1, a.get(this));
263	dl	1.1	}
264
265	dl	1.3	/**
266	dl	1.4	* getAndDecrement returns previous value and decrements
267	dl	1.3	*/
268	jsr166	1.12	public void testGetAndDecrement() {
269	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
270	jsr166	1.24	a = updaterFor("x");
271	dl	1.1	x = 1;
272	jsr166	1.22	assertEquals(1, a.getAndDecrement(this));
273			assertEquals(0, a.getAndDecrement(this));
274			assertEquals(-1, a.getAndDecrement(this));
275	dl	1.1	}
276
277	dl	1.3	/**
278	dl	1.4	* getAndIncrement returns previous value and increments
279	dl	1.3	*/
280	jsr166	1.12	public void testGetAndIncrement() {
281	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
282	jsr166	1.24	a = updaterFor("x");
283	dl	1.1	x = 1;
284	jsr166	1.22	assertEquals(1, a.getAndIncrement(this));
285			assertEquals(2, a.get(this));
286			a.set(this, -2);
287			assertEquals(-2, a.getAndIncrement(this));
288			assertEquals(-1, a.getAndIncrement(this));
289			assertEquals(0, a.getAndIncrement(this));
290			assertEquals(1, a.get(this));
291	dl	1.1	}
292
293	dl	1.3	/**
294	dl	1.4	* addAndGet adds given value to current, and returns current value
295	dl	1.3	*/
296	jsr166	1.12	public void testAddAndGet() {
297	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
298	jsr166	1.24	a = updaterFor("x");
299	dl	1.1	x = 1;
300	jsr166	1.22	assertEquals(3, a.addAndGet(this, 2));
301			assertEquals(3, a.get(this));
302			assertEquals(-1, a.addAndGet(this, -4));
303			assertEquals(-1, a.get(this));
304	dl	1.1	}
305
306	dl	1.3	/**
307	jsr166	1.18	* decrementAndGet decrements and returns current value
308	dl	1.3	*/
309	jsr166	1.12	public void testDecrementAndGet() {
310	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
311	jsr166	1.24	a = updaterFor("x");
312	dl	1.1	x = 1;
313	jsr166	1.22	assertEquals(0, a.decrementAndGet(this));
314			assertEquals(-1, a.decrementAndGet(this));
315			assertEquals(-2, a.decrementAndGet(this));
316			assertEquals(-2, a.get(this));
317	dl	1.1	}
318
319	dl	1.3	/**
320	dl	1.4	* incrementAndGet increments and returns current value
321	dl	1.3	*/
322	jsr166	1.12	public void testIncrementAndGet() {
323	dl	1.8	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
324	jsr166	1.24	a = updaterFor("x");
325	dl	1.1	x = 1;
326	jsr166	1.22	assertEquals(2, a.incrementAndGet(this));
327			assertEquals(2, a.get(this));
328			a.set(this, -2);
329			assertEquals(-1, a.incrementAndGet(this));
330			assertEquals(0, a.incrementAndGet(this));
331			assertEquals(1, a.incrementAndGet(this));
332			assertEquals(1, a.get(this));
333	dl	1.1	}
334
335			}