test/tck/AtomicReferenceFieldUpdaterTest.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.AtomicReferenceFieldUpdater;

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

public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
    volatile Integer x = null;
    protected volatile Integer protectedField;
    private volatile Integer privateField;
    Object z;
    Integer w;
    volatile int i;

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

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

        public void checkCompareAndSetProtectedSub() {
            AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest,Integer> a =
                AtomicReferenceFieldUpdater.newUpdater
                (AtomicReferenceFieldUpdaterTest.class, Integer.class, "protectedField");
            this.protectedField = one;
            assertTrue(a.compareAndSet(this, one, two));
            assertTrue(a.compareAndSet(this, two, m4));
            assertSame(m4, a.get(this));
            assertFalse(a.compareAndSet(this, m5, seven));
            assertFalse(seven == a.get(this));
            assertTrue(a.compareAndSet(this, m4, seven));
            assertSame(seven, a.get(this));
        }
    }

    static class UnrelatedClass {
        public void checkPackageAccess(AtomicReferenceFieldUpdaterTest obj) {
            obj.x = one;
            AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest,Integer> a =
                AtomicReferenceFieldUpdater.newUpdater
                (AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
            assertSame(one, a.get(obj));
            assertTrue(a.compareAndSet(obj, one, two));
            assertSame(two, a.get(obj));
        }

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

    static AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
        return AtomicReferenceFieldUpdater.newUpdater
            (AtomicReferenceFieldUpdaterTest.class, Integer.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 ClassCastException
     */
    public void testConstructor2() {
        try {
            updaterFor("z");
            shouldThrow();
        } catch (ClassCastException success) {}
    }

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

    /**
     * Constructor with non-reference field throws ClassCastException
     */
    public void testConstructor4() {
        try {
            updaterFor("i");
            shouldThrow();
        } catch (ClassCastException success) {}
    }

    /**
     * construction using private field from subclass throws RuntimeException
     */
    public void testPrivateFieldInSubclass() {
        AtomicReferenceFieldUpdaterTestSubclass s =
            new AtomicReferenceFieldUpdaterTestSubclass();
        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() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
        a = updaterFor("x");
        x = one;
        assertSame(one, a.get(this));
        a.set(this, two);
        assertSame(two, a.get(this));
        a.set(this, m3);
        assertSame(m3, a.get(this));
    }

    /**
     * get returns the last value lazySet by same thread
     */
    public void testGetLazySet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
        a = updaterFor("x");
        x = one;
        assertSame(one, a.get(this));
        a.lazySet(this, two);
        assertSame(two, a.get(this));
        a.lazySet(this, m3);
        assertSame(m3, a.get(this));
    }

    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
        a = updaterFor("x");
        x = one;
        assertTrue(a.compareAndSet(this, one, two));
        assertTrue(a.compareAndSet(this, two, m4));
        assertSame(m4, a.get(this));
        assertFalse(a.compareAndSet(this, m5, seven));
        assertFalse(seven == a.get(this));
        assertTrue(a.compareAndSet(this, m4, seven));
        assertSame(seven, a.get(this));
    }

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() throws Exception {
        x = one;
        final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
        a = updaterFor("x");

        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
                    Thread.yield();
            }});

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

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
        a = updaterFor("x");
        x = one;
        do {} while (!a.weakCompareAndSet(this, one, two));
        do {} while (!a.weakCompareAndSet(this, two, m4));
        assertSame(m4, a.get(this));
        do {} while (!a.weakCompareAndSet(this, m4, seven));
        assertSame(seven, a.get(this));
    }

    /**
     * getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
        a = updaterFor("x");
        x = one;
        assertSame(one, a.getAndSet(this, zero));
        assertSame(zero, a.getAndSet(this, m10));
        assertSame(m10, a.getAndSet(this, 1));
    }

}
Revision:	1.34
Committed:	Mon Nov 9 18:42:41 2015 UTC (8 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.33:	+72 -1 lines
Log Message:	improve tests for caller class != declaring class
#	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.AtomicReferenceFieldUpdater;
10
11	import junit.framework.Test;
12	import junit.framework.TestSuite;
13
14	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
15	volatile Integer x = null;
16	protected volatile Integer protectedField;
17	private volatile Integer privateField;
18	Object z;
19	Integer w;
20	volatile int i;
21
22	public static void main(String[] args) {
23	main(suite(), args);
24	}
25	public static Test suite() {
26	return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
27	}
28
29	// for testing subclass access
30	static class AtomicReferenceFieldUpdaterTestSubclass extends AtomicReferenceFieldUpdaterTest {
31	public void checkPrivateAccess() {
32	try {
33	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest,Integer> a =
34	AtomicReferenceFieldUpdater.newUpdater
35	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "privateField");
36	shouldThrow();
37	} catch (RuntimeException success) {
38	assertNotNull(success.getCause());
39	}
40	}
41
42	public void checkCompareAndSetProtectedSub() {
43	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest,Integer> a =
44	AtomicReferenceFieldUpdater.newUpdater
45	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "protectedField");
46	this.protectedField = one;
47	assertTrue(a.compareAndSet(this, one, two));
48	assertTrue(a.compareAndSet(this, two, m4));
49	assertSame(m4, a.get(this));
50	assertFalse(a.compareAndSet(this, m5, seven));
51	assertFalse(seven == a.get(this));
52	assertTrue(a.compareAndSet(this, m4, seven));
53	assertSame(seven, a.get(this));
54	}
55	}
56
57	static class UnrelatedClass {
58	public void checkPackageAccess(AtomicReferenceFieldUpdaterTest obj) {
59	obj.x = one;
60	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest,Integer> a =
61	AtomicReferenceFieldUpdater.newUpdater
62	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
63	assertSame(one, a.get(obj));
64	assertTrue(a.compareAndSet(obj, one, two));
65	assertSame(two, a.get(obj));
66	}
67
68	public void checkPrivateAccess(AtomicReferenceFieldUpdaterTest obj) {
69	try {
70	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest,Integer> a =
71	AtomicReferenceFieldUpdater.newUpdater
72	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "privateField");
73	throw new AssertionError("should throw");
74	} catch (RuntimeException success) {
75	assertNotNull(success.getCause());
76	}
77	}
78	}
79
80	static AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
81	return AtomicReferenceFieldUpdater.newUpdater
82	(AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName);
83	}
84
85	/**
86	* Construction with non-existent field throws RuntimeException
87	*/
88	public void testConstructor() {
89	try {
90	updaterFor("y");
91	shouldThrow();
92	} catch (RuntimeException success) {
93	assertNotNull(success.getCause());
94	}
95	}
96
97	/**
98	* construction with field not of given type throws ClassCastException
99	*/
100	public void testConstructor2() {
101	try {
102	updaterFor("z");
103	shouldThrow();
104	} catch (ClassCastException success) {}
105	}
106
107	/**
108	* Constructor with non-volatile field throws IllegalArgumentException
109	*/
110	public void testConstructor3() {
111	try {
112	updaterFor("w");
113	shouldThrow();
114	} catch (IllegalArgumentException success) {}
115	}
116
117	/**
118	* Constructor with non-reference field throws ClassCastException
119	*/
120	public void testConstructor4() {
121	try {
122	updaterFor("i");
123	shouldThrow();
124	} catch (ClassCastException success) {}
125	}
126
127	/**
128	* construction using private field from subclass throws RuntimeException
129	*/
130	public void testPrivateFieldInSubclass() {
131	AtomicReferenceFieldUpdaterTestSubclass s =
132	new AtomicReferenceFieldUpdaterTestSubclass();
133	s.checkPrivateAccess();
134	}
135
136	/**
137	* construction from unrelated class; package access is allowed,
138	* private access is not
139	*/
140	public void testUnrelatedClassAccess() {
141	new UnrelatedClass().checkPackageAccess(this);
142	new UnrelatedClass().checkPrivateAccess(this);
143	}
144
145	/**
146	* get returns the last value set or assigned
147	*/
148	public void testGetSet() {
149	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
150	a = updaterFor("x");
151	x = one;
152	assertSame(one, a.get(this));
153	a.set(this, two);
154	assertSame(two, a.get(this));
155	a.set(this, m3);
156	assertSame(m3, a.get(this));
157	}
158
159	/**
160	* get returns the last value lazySet by same thread
161	*/
162	public void testGetLazySet() {
163	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
164	a = updaterFor("x");
165	x = one;
166	assertSame(one, a.get(this));
167	a.lazySet(this, two);
168	assertSame(two, a.get(this));
169	a.lazySet(this, m3);
170	assertSame(m3, a.get(this));
171	}
172
173	/**
174	* compareAndSet succeeds in changing value if equal to expected else fails
175	*/
176	public void testCompareAndSet() {
177	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
178	a = updaterFor("x");
179	x = one;
180	assertTrue(a.compareAndSet(this, one, two));
181	assertTrue(a.compareAndSet(this, two, m4));
182	assertSame(m4, a.get(this));
183	assertFalse(a.compareAndSet(this, m5, seven));
184	assertFalse(seven == a.get(this));
185	assertTrue(a.compareAndSet(this, m4, seven));
186	assertSame(seven, a.get(this));
187	}
188
189	/**
190	* compareAndSet in one thread enables another waiting for value
191	* to succeed
192	*/
193	public void testCompareAndSetInMultipleThreads() throws Exception {
194	x = one;
195	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
196	a = updaterFor("x");
197
198	Thread t = new Thread(new CheckedRunnable() {
199	public void realRun() {
200	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
201	Thread.yield();
202	}});
203
204	t.start();
205	assertTrue(a.compareAndSet(this, one, two));
206	t.join(LONG_DELAY_MS);
207	assertFalse(t.isAlive());
208	assertSame(three, a.get(this));
209	}
210
211	/**
212	* repeated weakCompareAndSet succeeds in changing value when equal
213	* to expected
214	*/
215	public void testWeakCompareAndSet() {
216	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
217	a = updaterFor("x");
218	x = one;
219	do {} while (!a.weakCompareAndSet(this, one, two));
220	do {} while (!a.weakCompareAndSet(this, two, m4));
221	assertSame(m4, a.get(this));
222	do {} while (!a.weakCompareAndSet(this, m4, seven));
223	assertSame(seven, a.get(this));
224	}
225
226	/**
227	* getAndSet returns previous value and sets to given value
228	*/
229	public void testGetAndSet() {
230	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
231	a = updaterFor("x");
232	x = one;
233	assertSame(one, a.getAndSet(this, zero));
234	assertSame(zero, a.getAndSet(this, m10));
235	assertSame(m10, a.getAndSet(this, 1));
236	}
237
238	}