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 junit.framework.*;
import java.util.concurrent.atomic.AtomicBoolean;

public class AtomicBooleanTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    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
     */
    public void testWeakCompareAndSet() {
        AtomicBoolean ai = new AtomicBoolean(true);
        while (!ai.weakCompareAndSet(true, false));
        assertFalse(ai.get());
        while (!ai.weakCompareAndSet(false, false));
        assertFalse(ai.get());
        while (!ai.weakCompareAndSet(false, true));
        assertTrue(ai.get());
    }

    /**
     * getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet() {
        AtomicBoolean ai = new AtomicBoolean(true);
        assertEquals(true, ai.getAndSet(false));
        assertEquals(false, ai.getAndSet(false));
        assertEquals(false, ai.getAndSet(true));
        assertTrue(ai.get());
    }

    /**
     * a deserialized serialized 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(ai.toString(), Boolean.toString(false));
        ai.set(true);
        assertEquals(ai.toString(), Boolean.toString(true));
    }

}
Revision:	1.20
Committed:	Fri Jun 10 20:01:21 2011 UTC (12 years, 11 months ago) by jsr166
Branch:	MAIN
Changes since 1.19:	+10 -10 lines
Log Message:	whitespace
#	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			import junit.framework.*;
10	jsr166	1.19	import java.util.concurrent.atomic.AtomicBoolean;
11	dl	1.1
12	dl	1.3	public class AtomicBooleanTest extends JSR166TestCase {
13	jsr166	1.17	public static void main(String[] args) {
14			junit.textui.TestRunner.run(suite());
15	dl	1.1	}
16			public static Test suite() {
17			return new TestSuite(AtomicBooleanTest.class);
18			}
19
20	dl	1.4	/**
21	dl	1.5	* constructor initializes to given value
22	dl	1.4	*/
23			public void testConstructor() {
24	jsr166	1.16	assertTrue(new AtomicBoolean(true).get());
25			assertFalse(new AtomicBoolean(false).get());
26	dl	1.1	}
27
28	dl	1.4	/**
29	dl	1.7	* default constructed initializes to false
30	dl	1.4	*/
31			public void testConstructor2() {
32	dl	1.1	AtomicBoolean ai = new AtomicBoolean();
33	jsr166	1.16	assertFalse(ai.get());
34	dl	1.1	}
35
36	dl	1.4	/**
37	dl	1.5	* get returns the last value set
38	dl	1.4	*/
39			public void testGetSet() {
40	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
41	jsr166	1.16	assertTrue(ai.get());
42	jsr166	1.15	ai.set(false);
43	jsr166	1.16	assertFalse(ai.get());
44	jsr166	1.15	ai.set(true);
45	jsr166	1.16	assertTrue(ai.get());
46	dl	1.1	}
47	dl	1.5
48	dl	1.4	/**
49	dl	1.9	* get returns the last value lazySet in same thread
50			*/
51			public void testGetLazySet() {
52			AtomicBoolean ai = new AtomicBoolean(true);
53	jsr166	1.16	assertTrue(ai.get());
54	jsr166	1.15	ai.lazySet(false);
55	jsr166	1.16	assertFalse(ai.get());
56	jsr166	1.15	ai.lazySet(true);
57	jsr166	1.16	assertTrue(ai.get());
58	dl	1.9	}
59
60			/**
61	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
62	dl	1.4	*/
63			public void testCompareAndSet() {
64	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
65	jsr166	1.20	assertTrue(ai.compareAndSet(true, false));
66	jsr166	1.16	assertFalse(ai.get());
67	jsr166	1.20	assertTrue(ai.compareAndSet(false, false));
68	jsr166	1.16	assertFalse(ai.get());
69	jsr166	1.20	assertFalse(ai.compareAndSet(true, false));
70	jsr166	1.16	assertFalse(ai.get());
71	jsr166	1.20	assertTrue(ai.compareAndSet(false, true));
72	jsr166	1.16	assertTrue(ai.get());
73	dl	1.1	}
74
75	dl	1.4	/**
76	dl	1.5	* compareAndSet in one thread enables another waiting for value
77			* to succeed
78			*/
79	jsr166	1.13	public void testCompareAndSetInMultipleThreads() throws Exception {
80	dl	1.5	final AtomicBoolean ai = new AtomicBoolean(true);
81	jsr166	1.14	Thread t = new Thread(new CheckedRunnable() {
82			public void realRun() {
83			while (!ai.compareAndSet(false, true)) Thread.yield();
84			}});
85	jsr166	1.13
86			t.start();
87			assertTrue(ai.compareAndSet(true, false));
88			t.join(LONG_DELAY_MS);
89			assertFalse(t.isAlive());
90	dl	1.5	}
91
92			/**
93			* repeated weakCompareAndSet succeeds in changing value when equal
94	jsr166	1.10	* to expected
95	dl	1.4	*/
96			public void testWeakCompareAndSet() {
97	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
98	jsr166	1.20	while (!ai.weakCompareAndSet(true, false));
99	jsr166	1.16	assertFalse(ai.get());
100	jsr166	1.20	while (!ai.weakCompareAndSet(false, false));
101	jsr166	1.16	assertFalse(ai.get());
102	jsr166	1.20	while (!ai.weakCompareAndSet(false, true));
103	jsr166	1.16	assertTrue(ai.get());
104	dl	1.1	}
105
106	dl	1.4	/**
107	dl	1.5	* getAndSet returns previous value and sets to given value
108	dl	1.4	*/
109			public void testGetAndSet() {
110	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
111	jsr166	1.20	assertEquals(true, ai.getAndSet(false));
112			assertEquals(false, ai.getAndSet(false));
113			assertEquals(false, ai.getAndSet(true));
114	jsr166	1.16	assertTrue(ai.get());
115	dl	1.2	}
116
117	dl	1.4	/**
118	dl	1.5	* a deserialized serialized atomic holds same value
119	dl	1.4	*/
120	jsr166	1.13	public void testSerialization() throws Exception {
121	jsr166	1.19	AtomicBoolean x = new AtomicBoolean();
122			AtomicBoolean y = serialClone(x);
123			x.set(true);
124			AtomicBoolean z = serialClone(x);
125			assertTrue(x.get());
126			assertFalse(y.get());
127			assertTrue(z.get());
128	dl	1.1	}
129
130	dl	1.8	/**
131			* toString returns current value.
132	jsr166	1.10	*/
133	dl	1.8	public void testToString() {
134	jsr166	1.10	AtomicBoolean ai = new AtomicBoolean();
135	dl	1.8	assertEquals(ai.toString(), Boolean.toString(false));
136			ai.set(true);
137			assertEquals(ai.toString(), Boolean.toString(true));
138			}
139	dl	1.1
140			}