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 Item x = null;
    protected volatile Item protectedField;
    private volatile Item privateField;
    Object z;
    Item w;
    volatile int i;

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

    static AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> updaterFor(String fieldName) {
        return AtomicReferenceFieldUpdater.newUpdater
            (AtomicReferenceFieldUpdaterTest.class, Item.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() {
        new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass()
            .checkPrivateAccess();
    }

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

    /**
     * get returns the last value set or assigned
     */
    public void testGetSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
        a = updaterFor("x");
        x = one;
        assertSame(one, a.get(this));
        a.set(this, two);
        assertSame(two, a.get(this));
        a.set(this, minusThree);
        assertSame(minusThree, a.get(this));
    }

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

    /**
     * compareAndSet succeeds in changing value if same as expected else fails
     */
    public void testCompareAndSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
        a = updaterFor("x");
        x = one;
        assertTrue(a.compareAndSet(this, one, two));
        assertTrue(a.compareAndSet(this, two, minusFour));
        assertSame(minusFour, a.get(this));
        assertFalse(a.compareAndSet(this, minusFive, seven));
        assertNotSame(seven, a.get(this));
        assertTrue(a.compareAndSet(this, minusFour, seven));
        assertSame(seven, a.get(this));
    }

    /**
     * compareAndSet succeeds in changing protected field value if
     * same as expected else fails
     */
    public void testCompareAndSetProtectedInSubclass() {
        new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass()
            .checkCompareAndSetProtectedSub();
    }

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() throws Exception {
        x = one;
        final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> 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 same as expected
     */
    public void testWeakCompareAndSet() {
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
        a = updaterFor("x");
        x = one;
        do {} while (!a.weakCompareAndSet(this, one, two));
        do {} while (!a.weakCompareAndSet(this, two, minusFour));
        assertSame(minusFour, a.get(this));
        do {} while (!a.weakCompareAndSet(this, minusFour, seven));
        assertSame(seven, a.get(this));
    }

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

}
Revision:	1.38
Committed:	Tue Jan 26 13:33:05 2021 UTC (3 years, 3 months ago) by dl
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.37:	+25 -25 lines
Log Message:	Replace Integer with Item 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 Item x = null;
16	protected volatile Item protectedField;
17	private volatile Item privateField;
18	Object z;
19	Item 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	static AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> updaterFor(String fieldName) {
30	return AtomicReferenceFieldUpdater.newUpdater
31	(AtomicReferenceFieldUpdaterTest.class, Item.class, fieldName);
32	}
33
34	/**
35	* Construction with non-existent field throws RuntimeException
36	*/
37	public void testConstructor() {
38	try {
39	updaterFor("y");
40	shouldThrow();
41	} catch (RuntimeException success) {
42	assertNotNull(success.getCause());
43	}
44	}
45
46	/**
47	* construction with field not of given type throws ClassCastException
48	*/
49	public void testConstructor2() {
50	try {
51	updaterFor("z");
52	shouldThrow();
53	} catch (ClassCastException success) {}
54	}
55
56	/**
57	* Constructor with non-volatile field throws IllegalArgumentException
58	*/
59	public void testConstructor3() {
60	try {
61	updaterFor("w");
62	shouldThrow();
63	} catch (IllegalArgumentException success) {}
64	}
65
66	/**
67	* Constructor with non-reference field throws ClassCastException
68	*/
69	public void testConstructor4() {
70	try {
71	updaterFor("i");
72	shouldThrow();
73	} catch (ClassCastException success) {}
74	}
75
76	/**
77	* construction using private field from subclass throws RuntimeException
78	*/
79	public void testPrivateFieldInSubclass() {
80	new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass()
81	.checkPrivateAccess();
82	}
83
84	/**
85	* construction from unrelated class; package access is allowed,
86	* private access is not
87	*/
88	public void testUnrelatedClassAccess() {
89	new NonNestmates().checkPackageAccess(this);
90	new NonNestmates().checkPrivateAccess(this);
91	}
92
93	/**
94	* get returns the last value set or assigned
95	*/
96	public void testGetSet() {
97	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
98	a = updaterFor("x");
99	x = one;
100	assertSame(one, a.get(this));
101	a.set(this, two);
102	assertSame(two, a.get(this));
103	a.set(this, minusThree);
104	assertSame(minusThree, a.get(this));
105	}
106
107	/**
108	* get returns the last value lazySet by same thread
109	*/
110	public void testGetLazySet() {
111	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
112	a = updaterFor("x");
113	x = one;
114	assertSame(one, a.get(this));
115	a.lazySet(this, two);
116	assertSame(two, a.get(this));
117	a.lazySet(this, minusThree);
118	assertSame(minusThree, a.get(this));
119	}
120
121	/**
122	* compareAndSet succeeds in changing value if same as expected else fails
123	*/
124	public void testCompareAndSet() {
125	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
126	a = updaterFor("x");
127	x = one;
128	assertTrue(a.compareAndSet(this, one, two));
129	assertTrue(a.compareAndSet(this, two, minusFour));
130	assertSame(minusFour, a.get(this));
131	assertFalse(a.compareAndSet(this, minusFive, seven));
132	assertNotSame(seven, a.get(this));
133	assertTrue(a.compareAndSet(this, minusFour, seven));
134	assertSame(seven, a.get(this));
135	}
136
137	/**
138	* compareAndSet succeeds in changing protected field value if
139	* same as expected else fails
140	*/
141	public void testCompareAndSetProtectedInSubclass() {
142	new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass()
143	.checkCompareAndSetProtectedSub();
144	}
145
146	/**
147	* compareAndSet in one thread enables another waiting for value
148	* to succeed
149	*/
150	public void testCompareAndSetInMultipleThreads() throws Exception {
151	x = one;
152	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
153	a = updaterFor("x");
154
155	Thread t = new Thread(new CheckedRunnable() {
156	public void realRun() {
157	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
158	Thread.yield();
159	}});
160
161	t.start();
162	assertTrue(a.compareAndSet(this, one, two));
163	t.join(LONG_DELAY_MS);
164	assertFalse(t.isAlive());
165	assertSame(three, a.get(this));
166	}
167
168	/**
169	* repeated weakCompareAndSet succeeds in changing value when same as expected
170	*/
171	public void testWeakCompareAndSet() {
172	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
173	a = updaterFor("x");
174	x = one;
175	do {} while (!a.weakCompareAndSet(this, one, two));
176	do {} while (!a.weakCompareAndSet(this, two, minusFour));
177	assertSame(minusFour, a.get(this));
178	do {} while (!a.weakCompareAndSet(this, minusFour, seven));
179	assertSame(seven, a.get(this));
180	}
181
182	/**
183	* getAndSet returns previous value and sets to given value
184	*/
185	public void testGetAndSet() {
186	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
187	a = updaterFor("x");
188	x = one;
189	assertSame(one, a.getAndSet(this, zero));
190	assertSame(zero, a.getAndSet(this, minusTen));
191	assertSame(minusTen, a.getAndSet(this, one));
192	}
193
194	}