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);
    }

    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() {
        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, 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));
        assertNotSame(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:	1.36
Committed:	Wed Sep 20 00:41:13 2017 UTC (6 years, 7 months ago) by jsr166
Branch:	MAIN
Changes since 1.35:	+4 -56 lines
Log Message:	8187607: [Testbug] Atomic*FieldUpdaterTest.checkPrivateAccess uses nested classes
#	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	static AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
30	return AtomicReferenceFieldUpdater.newUpdater
31	(AtomicReferenceFieldUpdaterTest.class, Integer.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, Integer> 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, m3);
104	assertSame(m3, a.get(this));
105	}
106
107	/**
108	* get returns the last value lazySet by same thread
109	*/
110	public void testGetLazySet() {
111	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> 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, m3);
118	assertSame(m3, a.get(this));
119	}
120
121	/**
122	* compareAndSet succeeds in changing value if equal to expected else fails
123	*/
124	public void testCompareAndSet() {
125	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
126	a = updaterFor("x");
127	x = one;
128	assertTrue(a.compareAndSet(this, one, two));
129	assertTrue(a.compareAndSet(this, two, m4));
130	assertSame(m4, a.get(this));
131	assertFalse(a.compareAndSet(this, m5, seven));
132	assertNotSame(seven, a.get(this));
133	assertTrue(a.compareAndSet(this, m4, seven));
134	assertSame(seven, a.get(this));
135	}
136
137	/**
138	* compareAndSet in one thread enables another waiting for value
139	* to succeed
140	*/
141	public void testCompareAndSetInMultipleThreads() throws Exception {
142	x = one;
143	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
144	a = updaterFor("x");
145
146	Thread t = new Thread(new CheckedRunnable() {
147	public void realRun() {
148	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
149	Thread.yield();
150	}});
151
152	t.start();
153	assertTrue(a.compareAndSet(this, one, two));
154	t.join(LONG_DELAY_MS);
155	assertFalse(t.isAlive());
156	assertSame(three, a.get(this));
157	}
158
159	/**
160	* repeated weakCompareAndSet succeeds in changing value when equal
161	* to expected
162	*/
163	public void testWeakCompareAndSet() {
164	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
165	a = updaterFor("x");
166	x = one;
167	do {} while (!a.weakCompareAndSet(this, one, two));
168	do {} while (!a.weakCompareAndSet(this, two, m4));
169	assertSame(m4, a.get(this));
170	do {} while (!a.weakCompareAndSet(this, m4, seven));
171	assertSame(seven, a.get(this));
172	}
173
174	/**
175	* getAndSet returns previous value and sets to given value
176	*/
177	public void testGetAndSet() {
178	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
179	a = updaterFor("x");
180	x = one;
181	assertSame(one, a.getAndSet(this, zero));
182	assertSame(zero, a.getAndSet(this, m10));
183	assertSame(m10, a.getAndSet(this, 1));
184	}
185
186	}