test/tck/AtomicBooleanTest.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.AtomicBoolean;

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

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

    /**
     * constructor initializes to given value
     */
    public void testConstructor() {
        assertTrue(new AtomicBoolean(true).get());
        assertFalse(new AtomicBoolean(false).get());
    }

    /**
     * default constructed initializes to false
     */
    public void testConstructor2() {
        AtomicBoolean ai = new AtomicBoolean();
        assertFalse(ai.get());
    }

    /**
     * get returns the last value set
     */
    public void testGetSet() {
        AtomicBoolean ai = new AtomicBoolean(true);
        assertTrue(ai.get());
        ai.set(false);
        assertFalse(ai.get());
        ai.set(true);
        assertTrue(ai.get());
    }

    /**
     * get returns the last value lazySet in same thread
     */
    public void testGetLazySet() {
        AtomicBoolean ai = new AtomicBoolean(true);
        assertTrue(ai.get());
        ai.lazySet(false);
        assertFalse(ai.get());
        ai.lazySet(true);
        assertTrue(ai.get());
    }

    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicBoolean ai = new AtomicBoolean(true);
        assertTrue(ai.compareAndSet(true, false));
        assertFalse(ai.get());
        assertTrue(ai.compareAndSet(false, false));
        assertFalse(ai.get());
        assertFalse(ai.compareAndSet(true, false));
        assertFalse(ai.get());
        assertTrue(ai.compareAndSet(false, true));
        assertTrue(ai.get());
    }

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

        t.start();
        assertTrue(ai.compareAndSet(true, false));
        t.join(LONG_DELAY_MS);
        assertFalse(t.isAlive());
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    @SuppressWarnings("deprecation")
    public void testWeakCompareAndSet() {
        AtomicBoolean ai = new AtomicBoolean(true);
        do {} while (!ai.weakCompareAndSet(true, false));
        assertFalse(ai.get());
        do {} while (!ai.weakCompareAndSet(false, false));
        assertFalse(ai.get());
        do {} while (!ai.weakCompareAndSet(false, true));
        assertTrue(ai.get());
    }

    /**
     * getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet() {
        AtomicBoolean ai = new AtomicBoolean();
        boolean[] booleans = { false, true };
        for (boolean before : booleans)
            for (boolean after : booleans) {
                ai.set(before);
                assertEquals(before, ai.getAndSet(after));
                assertEquals(after, ai.get());
            }
    }

    /**
     * a deserialized/reserialized atomic holds same value
     */
    public void testSerialization() throws Exception {
        AtomicBoolean x = new AtomicBoolean();
        AtomicBoolean y = serialClone(x);
        x.set(true);
        AtomicBoolean z = serialClone(x);
        assertTrue(x.get());
        assertFalse(y.get());
        assertTrue(z.get());
    }

    /**
     * toString returns current value.
     */
    public void testToString() {
        AtomicBoolean ai = new AtomicBoolean();
        assertEquals(Boolean.toString(false), ai.toString());
        ai.set(true);
        assertEquals(Boolean.toString(true), ai.toString());
    }

}
Revision:	1.30
Committed:	Tue Jan 26 13:33:05 2021 UTC (3 years, 3 months ago) by dl
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.29:	+1 -0 lines
Log Message:	Replace Integer with Item class
#	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	1.18	* 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	1.19	import java.util.concurrent.atomic.AtomicBoolean;
10	dl	1.1
11	jsr166	1.22	import junit.framework.Test;
12			import junit.framework.TestSuite;
13
14	dl	1.3	public class AtomicBooleanTest extends JSR166TestCase {
15	jsr166	1.17	public static void main(String[] args) {
16	jsr166	1.24	main(suite(), args);
17	dl	1.1	}
18			public static Test suite() {
19			return new TestSuite(AtomicBooleanTest.class);
20			}
21
22	dl	1.4	/**
23	dl	1.5	* constructor initializes to given value
24	dl	1.4	*/
25			public void testConstructor() {
26	jsr166	1.16	assertTrue(new AtomicBoolean(true).get());
27			assertFalse(new AtomicBoolean(false).get());
28	dl	1.1	}
29
30	dl	1.4	/**
31	dl	1.7	* default constructed initializes to false
32	dl	1.4	*/
33			public void testConstructor2() {
34	dl	1.1	AtomicBoolean ai = new AtomicBoolean();
35	jsr166	1.16	assertFalse(ai.get());
36	dl	1.1	}
37
38	dl	1.4	/**
39	dl	1.5	* get returns the last value set
40	dl	1.4	*/
41			public void testGetSet() {
42	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
43	jsr166	1.16	assertTrue(ai.get());
44	jsr166	1.15	ai.set(false);
45	jsr166	1.16	assertFalse(ai.get());
46	jsr166	1.15	ai.set(true);
47	jsr166	1.16	assertTrue(ai.get());
48	dl	1.1	}
49	dl	1.5
50	dl	1.4	/**
51	dl	1.9	* get returns the last value lazySet in same thread
52			*/
53			public void testGetLazySet() {
54			AtomicBoolean ai = new AtomicBoolean(true);
55	jsr166	1.16	assertTrue(ai.get());
56	jsr166	1.15	ai.lazySet(false);
57	jsr166	1.16	assertFalse(ai.get());
58	jsr166	1.15	ai.lazySet(true);
59	jsr166	1.16	assertTrue(ai.get());
60	dl	1.9	}
61
62			/**
63	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
64	dl	1.4	*/
65			public void testCompareAndSet() {
66	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
67	jsr166	1.20	assertTrue(ai.compareAndSet(true, false));
68	jsr166	1.16	assertFalse(ai.get());
69	jsr166	1.20	assertTrue(ai.compareAndSet(false, false));
70	jsr166	1.16	assertFalse(ai.get());
71	jsr166	1.20	assertFalse(ai.compareAndSet(true, false));
72	jsr166	1.16	assertFalse(ai.get());
73	jsr166	1.20	assertTrue(ai.compareAndSet(false, true));
74	jsr166	1.16	assertTrue(ai.get());
75	dl	1.1	}
76
77	dl	1.4	/**
78	dl	1.5	* compareAndSet in one thread enables another waiting for value
79			* to succeed
80			*/
81	jsr166	1.13	public void testCompareAndSetInMultipleThreads() throws Exception {
82	dl	1.5	final AtomicBoolean ai = new AtomicBoolean(true);
83	jsr166	1.14	Thread t = new Thread(new CheckedRunnable() {
84			public void realRun() {
85			while (!ai.compareAndSet(false, true)) Thread.yield();
86			}});
87	jsr166	1.13
88			t.start();
89			assertTrue(ai.compareAndSet(true, false));
90			t.join(LONG_DELAY_MS);
91			assertFalse(t.isAlive());
92	dl	1.5	}
93
94			/**
95			* repeated weakCompareAndSet succeeds in changing value when equal
96	jsr166	1.10	* to expected
97	dl	1.4	*/
98	dl	1.30	@SuppressWarnings("deprecation")
99	dl	1.4	public void testWeakCompareAndSet() {
100	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
101	jsr166	1.23	do {} while (!ai.weakCompareAndSet(true, false));
102	jsr166	1.16	assertFalse(ai.get());
103	jsr166	1.23	do {} while (!ai.weakCompareAndSet(false, false));
104	jsr166	1.16	assertFalse(ai.get());
105	jsr166	1.23	do {} while (!ai.weakCompareAndSet(false, true));
106	jsr166	1.16	assertTrue(ai.get());
107	dl	1.1	}
108
109	dl	1.4	/**
110	dl	1.5	* getAndSet returns previous value and sets to given value
111	dl	1.4	*/
112			public void testGetAndSet() {
113	jsr166	1.28	AtomicBoolean ai = new AtomicBoolean();
114			boolean[] booleans = { false, true };
115			for (boolean before : booleans)
116			for (boolean after : booleans) {
117			ai.set(before);
118			assertEquals(before, ai.getAndSet(after));
119			assertEquals(after, ai.get());
120			}
121	dl	1.2	}
122
123	dl	1.4	/**
124	jsr166	1.29	* a deserialized/reserialized atomic holds same value
125	dl	1.4	*/
126	jsr166	1.13	public void testSerialization() throws Exception {
127	jsr166	1.19	AtomicBoolean x = new AtomicBoolean();
128			AtomicBoolean y = serialClone(x);
129			x.set(true);
130			AtomicBoolean z = serialClone(x);
131			assertTrue(x.get());
132			assertFalse(y.get());
133			assertTrue(z.get());
134	dl	1.1	}
135
136	dl	1.8	/**
137			* toString returns current value.
138	jsr166	1.10	*/
139	dl	1.8	public void testToString() {
140	jsr166	1.10	AtomicBoolean ai = new AtomicBoolean();
141	jsr166	1.21	assertEquals(Boolean.toString(false), ai.toString());
142	dl	1.8	ai.set(true);
143	jsr166	1.21	assertEquals(Boolean.toString(true), ai.toString());
144	dl	1.8	}
145	dl	1.1
146			}