test/tck/AtomicReferenceTest.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.AtomicReference;

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

public class AtomicReferenceTest extends JSR166TestCase {
    public static void main(String[] args) {
        main(suite(), args);
    }
    public static Test suite() {
        return new TestSuite(AtomicReferenceTest.class);
    }

    /**
     * constructor initializes to given value
     */
    public void testConstructor() {
        AtomicReference ai = new AtomicReference(one);
        assertSame(one, ai.get());
    }

    /**
     * default constructed initializes to null
     */
    public void testConstructor2() {
        AtomicReference ai = new AtomicReference();
        assertNull(ai.get());
    }

    /**
     * get returns the last value set
     */
    public void testGetSet() {
        AtomicReference ai = new AtomicReference(one);
        assertSame(one, ai.get());
        ai.set(two);
        assertSame(two, ai.get());
        ai.set(m3);
        assertSame(m3, ai.get());
    }

    /**
     * get returns the last value lazySet in same thread
     */
    public void testGetLazySet() {
        AtomicReference ai = new AtomicReference(one);
        assertSame(one, ai.get());
        ai.lazySet(two);
        assertSame(two, ai.get());
        ai.lazySet(m3);
        assertSame(m3, ai.get());
    }

    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicReference ai = new AtomicReference(one);
        assertTrue(ai.compareAndSet(one, two));
        assertTrue(ai.compareAndSet(two, m4));
        assertSame(m4, ai.get());
        assertFalse(ai.compareAndSet(m5, seven));
        assertSame(m4, ai.get());
        assertTrue(ai.compareAndSet(m4, seven));
        assertSame(seven, ai.get());
    }

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() throws Exception {
        final AtomicReference ai = new AtomicReference(one);
        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                while (!ai.compareAndSet(two, three))
                    Thread.yield();
            }});

        t.start();
        assertTrue(ai.compareAndSet(one, two));
        t.join(LONG_DELAY_MS);
        assertFalse(t.isAlive());
        assertSame(three, ai.get());
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSet() {
        AtomicReference ai = new AtomicReference(one);
        do {} while (!ai.weakCompareAndSet(one, two));
        do {} while (!ai.weakCompareAndSet(two, m4));
        assertSame(m4, ai.get());
        do {} while (!ai.weakCompareAndSet(m4, seven));
        assertSame(seven, ai.get());
    }

    /**
     * getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet() {
        AtomicReference ai = new AtomicReference(one);
        assertSame(one, ai.getAndSet(zero));
        assertSame(zero, ai.getAndSet(m10));
        assertSame(m10, ai.getAndSet(one));
    }

    /**
     * a deserialized serialized atomic holds same value
     */
    public void testSerialization() throws Exception {
        AtomicReference x = new AtomicReference();
        AtomicReference y = serialClone(x);
        assertNotSame(x, y);
        x.set(one);
        AtomicReference z = serialClone(x);
        assertNotSame(y, z);
        assertEquals(one, x.get());
        assertEquals(null, y.get());
        assertEquals(one, z.get());
    }

    /**
     * toString returns current value.
     */
    public void testToString() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        assertEquals(one.toString(), ai.toString());
        ai.set(two);
        assertEquals(two.toString(), ai.toString());
    }

    // jdk9

    /**
     * getPlain returns the last value set
     */
    public void testGetPlainSet() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        assertEquals(one, ai.getPlain());
        ai.set(two);
        assertEquals(two, ai.getPlain());
        ai.set(m3);
        assertEquals(m3, ai.getPlain());
    }

    /**
     * getOpaque returns the last value set
     */
    public void testGetOpaqueSet() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        assertEquals(one, ai.getOpaque());
        ai.set(two);
        assertEquals(two, ai.getOpaque());
        ai.set(m3);
        assertEquals(m3, ai.getOpaque());
    }

    /**
     * getAcquire returns the last value set
     */
    public void testGetAcquireSet() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        assertEquals(one, ai.getAcquire());
        ai.set(two);
        assertEquals(two, ai.getAcquire());
        ai.set(m3);
        assertEquals(m3, ai.getAcquire());
    }

    /**
     * get returns the last value setPlain
     */
    public void testGetSetPlain() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        assertEquals(one, ai.get());
        ai.setPlain(two);
        assertEquals(two, ai.get());
        ai.setPlain(m3);
        assertEquals(m3, ai.get());
    }

    /**
     * get returns the last value setOpaque
     */
    public void testGetSetOpaque() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        assertEquals(one, ai.get());
        ai.setOpaque(two);
        assertEquals(two, ai.get());
        ai.setOpaque(m3);
        assertEquals(m3, ai.get());
    }

    /**
     * get returns the last value setRelease
     */
    public void testGetSetRelease() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        assertEquals(one, ai.get());
        ai.setRelease(two);
        assertEquals(two, ai.get());
        ai.setRelease(m3);
        assertEquals(m3, ai.get());
    }

    /**
     * compareAndExchange succeeds in changing value if equal to
     * expected else fails
     */
    public void testCompareAndExchange() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        assertEquals(one, ai.compareAndExchange(one, two));
        assertEquals(two, ai.compareAndExchange(two, m4));
        assertEquals(m4, ai.get());
        assertEquals(m4, ai.compareAndExchange(m5, seven));
        assertEquals(m4, ai.get());
        assertEquals(m4, ai.compareAndExchange(m4, seven));
        assertEquals(seven, ai.get());
    }

    /**
     * compareAndExchangeAcquire succeeds in changing value if equal to
     * expected else fails
     */
    public void testCompareAndExchangeAcquire() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        assertEquals(one, ai.compareAndExchangeAcquire(one, two));
        assertEquals(two, ai.compareAndExchangeAcquire(two, m4));
        assertEquals(m4, ai.get());
        assertEquals(m4, ai.compareAndExchangeAcquire(m5, seven));
        assertEquals(m4, ai.get());
        assertEquals(m4, ai.compareAndExchangeAcquire(m4, seven));
        assertEquals(seven, ai.get());
    }

    /**
     * compareAndExchangeRelease succeeds in changing value if equal to
     * expected else fails
     */
    public void testCompareAndExchangeRelease() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        assertEquals(one, ai.compareAndExchangeRelease(one, two));
        assertEquals(two, ai.compareAndExchangeRelease(two, m4));
        assertEquals(m4, ai.get());
        assertEquals(m4, ai.compareAndExchangeRelease(m5, seven));
        assertEquals(m4, ai.get());
        assertEquals(m4, ai.compareAndExchangeRelease(m4, seven));
        assertEquals(seven, ai.get());
    }

    /**
     * repeated weakCompareAndSetVolatile succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSetVolatile() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        do {} while (!ai.weakCompareAndSetVolatile(one, two));
        do {} while (!ai.weakCompareAndSetVolatile(two, m4));
        assertEquals(m4, ai.get());
        do {} while (!ai.weakCompareAndSetVolatile(m4, seven));
        assertEquals(seven, ai.get());
    }

    /**
     * repeated weakCompareAndSetAcquire succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSetAcquire() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        do {} while (!ai.weakCompareAndSetAcquire(one, two));
        do {} while (!ai.weakCompareAndSetAcquire(two, m4));
        assertEquals(m4, ai.get());
        do {} while (!ai.weakCompareAndSetAcquire(m4, seven));
        assertEquals(seven, ai.get());
    }

    /**
     * repeated weakCompareAndSetRelease succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSetRelease() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
        do {} while (!ai.weakCompareAndSetRelease(one, two));
        do {} while (!ai.weakCompareAndSetRelease(two, m4));
        assertEquals(m4, ai.get());
        do {} while (!ai.weakCompareAndSetRelease(m4, seven));
        assertEquals(seven, ai.get());
    }

}
Revision:	1.26
Committed:	Fri Jun 17 01:38:28 2016 UTC (7 years, 10 months ago) by jsr166
Branch:	MAIN
Changes since 1.25:	+4 -6 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/publicdomain/zero/1.0/
5	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	* Pat Fisher, Mike Judd.
7	*/
8
9	import java.util.concurrent.atomic.AtomicReference;
10
11	import junit.framework.Test;
12	import junit.framework.TestSuite;
13
14	public class AtomicReferenceTest extends JSR166TestCase {
15	public static void main(String[] args) {
16	main(suite(), args);
17	}
18	public static Test suite() {
19	return new TestSuite(AtomicReferenceTest.class);
20	}
21
22	/**
23	* constructor initializes to given value
24	*/
25	public void testConstructor() {
26	AtomicReference ai = new AtomicReference(one);
27	assertSame(one, ai.get());
28	}
29
30	/**
31	* default constructed initializes to null
32	*/
33	public void testConstructor2() {
34	AtomicReference ai = new AtomicReference();
35	assertNull(ai.get());
36	}
37
38	/**
39	* get returns the last value set
40	*/
41	public void testGetSet() {
42	AtomicReference ai = new AtomicReference(one);
43	assertSame(one, ai.get());
44	ai.set(two);
45	assertSame(two, ai.get());
46	ai.set(m3);
47	assertSame(m3, ai.get());
48	}
49
50	/**
51	* get returns the last value lazySet in same thread
52	*/
53	public void testGetLazySet() {
54	AtomicReference ai = new AtomicReference(one);
55	assertSame(one, ai.get());
56	ai.lazySet(two);
57	assertSame(two, ai.get());
58	ai.lazySet(m3);
59	assertSame(m3, ai.get());
60	}
61
62	/**
63	* compareAndSet succeeds in changing value if equal to expected else fails
64	*/
65	public void testCompareAndSet() {
66	AtomicReference ai = new AtomicReference(one);
67	assertTrue(ai.compareAndSet(one, two));
68	assertTrue(ai.compareAndSet(two, m4));
69	assertSame(m4, ai.get());
70	assertFalse(ai.compareAndSet(m5, seven));
71	assertSame(m4, ai.get());
72	assertTrue(ai.compareAndSet(m4, seven));
73	assertSame(seven, ai.get());
74	}
75
76	/**
77	* compareAndSet in one thread enables another waiting for value
78	* to succeed
79	*/
80	public void testCompareAndSetInMultipleThreads() throws Exception {
81	final AtomicReference ai = new AtomicReference(one);
82	Thread t = new Thread(new CheckedRunnable() {
83	public void realRun() {
84	while (!ai.compareAndSet(two, three))
85	Thread.yield();
86	}});
87
88	t.start();
89	assertTrue(ai.compareAndSet(one, two));
90	t.join(LONG_DELAY_MS);
91	assertFalse(t.isAlive());
92	assertSame(three, ai.get());
93	}
94
95	/**
96	* repeated weakCompareAndSet succeeds in changing value when equal
97	* to expected
98	*/
99	public void testWeakCompareAndSet() {
100	AtomicReference ai = new AtomicReference(one);
101	do {} while (!ai.weakCompareAndSet(one, two));
102	do {} while (!ai.weakCompareAndSet(two, m4));
103	assertSame(m4, ai.get());
104	do {} while (!ai.weakCompareAndSet(m4, seven));
105	assertSame(seven, ai.get());
106	}
107
108	/**
109	* getAndSet returns previous value and sets to given value
110	*/
111	public void testGetAndSet() {
112	AtomicReference ai = new AtomicReference(one);
113	assertSame(one, ai.getAndSet(zero));
114	assertSame(zero, ai.getAndSet(m10));
115	assertSame(m10, ai.getAndSet(one));
116	}
117
118	/**
119	* a deserialized serialized atomic holds same value
120	*/
121	public void testSerialization() throws Exception {
122	AtomicReference x = new AtomicReference();
123	AtomicReference y = serialClone(x);
124	assertNotSame(x, y);
125	x.set(one);
126	AtomicReference z = serialClone(x);
127	assertNotSame(y, z);
128	assertEquals(one, x.get());
129	assertEquals(null, y.get());
130	assertEquals(one, z.get());
131	}
132
133	/**
134	* toString returns current value.
135	*/
136	public void testToString() {
137	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
138	assertEquals(one.toString(), ai.toString());
139	ai.set(two);
140	assertEquals(two.toString(), ai.toString());
141	}
142
143	// jdk9
144
145	/**
146	* getPlain returns the last value set
147	*/
148	public void testGetPlainSet() {
149	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
150	assertEquals(one, ai.getPlain());
151	ai.set(two);
152	assertEquals(two, ai.getPlain());
153	ai.set(m3);
154	assertEquals(m3, ai.getPlain());
155	}
156
157	/**
158	* getOpaque returns the last value set
159	*/
160	public void testGetOpaqueSet() {
161	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
162	assertEquals(one, ai.getOpaque());
163	ai.set(two);
164	assertEquals(two, ai.getOpaque());
165	ai.set(m3);
166	assertEquals(m3, ai.getOpaque());
167	}
168
169	/**
170	* getAcquire returns the last value set
171	*/
172	public void testGetAcquireSet() {
173	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
174	assertEquals(one, ai.getAcquire());
175	ai.set(two);
176	assertEquals(two, ai.getAcquire());
177	ai.set(m3);
178	assertEquals(m3, ai.getAcquire());
179	}
180
181	/**
182	* get returns the last value setPlain
183	*/
184	public void testGetSetPlain() {
185	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
186	assertEquals(one, ai.get());
187	ai.setPlain(two);
188	assertEquals(two, ai.get());
189	ai.setPlain(m3);
190	assertEquals(m3, ai.get());
191	}
192
193	/**
194	* get returns the last value setOpaque
195	*/
196	public void testGetSetOpaque() {
197	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
198	assertEquals(one, ai.get());
199	ai.setOpaque(two);
200	assertEquals(two, ai.get());
201	ai.setOpaque(m3);
202	assertEquals(m3, ai.get());
203	}
204
205	/**
206	* get returns the last value setRelease
207	*/
208	public void testGetSetRelease() {
209	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
210	assertEquals(one, ai.get());
211	ai.setRelease(two);
212	assertEquals(two, ai.get());
213	ai.setRelease(m3);
214	assertEquals(m3, ai.get());
215	}
216
217	/**
218	* compareAndExchange succeeds in changing value if equal to
219	* expected else fails
220	*/
221	public void testCompareAndExchange() {
222	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
223	assertEquals(one, ai.compareAndExchange(one, two));
224	assertEquals(two, ai.compareAndExchange(two, m4));
225	assertEquals(m4, ai.get());
226	assertEquals(m4, ai.compareAndExchange(m5, seven));
227	assertEquals(m4, ai.get());
228	assertEquals(m4, ai.compareAndExchange(m4, seven));
229	assertEquals(seven, ai.get());
230	}
231
232	/**
233	* compareAndExchangeAcquire succeeds in changing value if equal to
234	* expected else fails
235	*/
236	public void testCompareAndExchangeAcquire() {
237	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
238	assertEquals(one, ai.compareAndExchangeAcquire(one, two));
239	assertEquals(two, ai.compareAndExchangeAcquire(two, m4));
240	assertEquals(m4, ai.get());
241	assertEquals(m4, ai.compareAndExchangeAcquire(m5, seven));
242	assertEquals(m4, ai.get());
243	assertEquals(m4, ai.compareAndExchangeAcquire(m4, seven));
244	assertEquals(seven, ai.get());
245	}
246
247	/**
248	* compareAndExchangeRelease succeeds in changing value if equal to
249	* expected else fails
250	*/
251	public void testCompareAndExchangeRelease() {
252	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
253	assertEquals(one, ai.compareAndExchangeRelease(one, two));
254	assertEquals(two, ai.compareAndExchangeRelease(two, m4));
255	assertEquals(m4, ai.get());
256	assertEquals(m4, ai.compareAndExchangeRelease(m5, seven));
257	assertEquals(m4, ai.get());
258	assertEquals(m4, ai.compareAndExchangeRelease(m4, seven));
259	assertEquals(seven, ai.get());
260	}
261
262	/**
263	* repeated weakCompareAndSetVolatile succeeds in changing value when equal
264	* to expected
265	*/
266	public void testWeakCompareAndSetVolatile() {
267	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
268	do {} while (!ai.weakCompareAndSetVolatile(one, two));
269	do {} while (!ai.weakCompareAndSetVolatile(two, m4));
270	assertEquals(m4, ai.get());
271	do {} while (!ai.weakCompareAndSetVolatile(m4, seven));
272	assertEquals(seven, ai.get());
273	}
274
275	/**
276	* repeated weakCompareAndSetAcquire succeeds in changing value when equal
277	* to expected
278	*/
279	public void testWeakCompareAndSetAcquire() {
280	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
281	do {} while (!ai.weakCompareAndSetAcquire(one, two));
282	do {} while (!ai.weakCompareAndSetAcquire(two, m4));
283	assertEquals(m4, ai.get());
284	do {} while (!ai.weakCompareAndSetAcquire(m4, seven));
285	assertEquals(seven, ai.get());
286	}
287
288	/**
289	* repeated weakCompareAndSetRelease succeeds in changing value when equal
290	* to expected
291	*/
292	public void testWeakCompareAndSetRelease() {
293	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
294	do {} while (!ai.weakCompareAndSetRelease(one, two));
295	do {} while (!ai.weakCompareAndSetRelease(two, m4));
296	assertEquals(m4, ai.get());
297	do {} while (!ai.weakCompareAndSetRelease(m4, seven));
298	assertEquals(seven, ai.get());
299	}
300
301	}