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/licenses/publicdomain
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

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

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() {
        AtomicBoolean ai = new AtomicBoolean(true);
        assertEquals(true,ai.get());
    }

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

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

    }

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

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() {
        final AtomicBoolean ai = new AtomicBoolean(true);
        Thread t = new Thread(new Runnable() {
                public void run() {
                    while (!ai.compareAndSet(false, true)) Thread.yield();
                }});
        try {
            t.start();
            assertTrue(ai.compareAndSet(true, false));
            t.join(LONG_DELAY_MS);
            assertFalse(t.isAlive());
        }
        catch (Exception e) {
            unexpectedException();
        }
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSet() {
        AtomicBoolean ai = new AtomicBoolean(true);
        while (!ai.weakCompareAndSet(true,false));
        assertEquals(false,ai.get());
        while (!ai.weakCompareAndSet(false,false));
        assertEquals(false,ai.get());
        while (!ai.weakCompareAndSet(false,true));
        assertEquals(true,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));
        assertEquals(true,ai.get());
    }

    /**
     * a deserialized serialized atomic holds same value
     */
    public void testSerialization() {
        AtomicBoolean l = new AtomicBoolean();

        try {
            l.set(true);
            ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
            ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
            out.writeObject(l);
            out.close();

            ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
            ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
            AtomicBoolean r = (AtomicBoolean) in.readObject();
            assertEquals(l.get(), r.get());
        } catch (Exception e) {
            e.printStackTrace();
            unexpectedException();
        }
    }

    /**
     * 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:	1.12
Committed:	Mon Nov 16 05:30:07 2009 UTC (14 years, 6 months ago) by jsr166
Branch:	MAIN
Changes since 1.11:	+1 -1 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			* http://creativecommons.org/licenses/publicdomain
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			import java.util.concurrent.atomic.*;
11	dl	1.2	import java.io.*;
12	dl	1.1
13	dl	1.3	public class AtomicBooleanTest extends JSR166TestCase {
14	dl	1.1	public static void main (String[] args) {
15			junit.textui.TestRunner.run (suite());
16			}
17			public static Test suite() {
18			return new TestSuite(AtomicBooleanTest.class);
19			}
20
21	dl	1.4	/**
22	dl	1.5	* constructor initializes to given value
23	dl	1.4	*/
24			public void testConstructor() {
25	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
26			assertEquals(true,ai.get());
27			}
28
29	dl	1.4	/**
30	dl	1.7	* default constructed initializes to false
31	dl	1.4	*/
32			public void testConstructor2() {
33	dl	1.1	AtomicBoolean ai = new AtomicBoolean();
34			assertEquals(false,ai.get());
35			}
36
37	dl	1.4	/**
38	dl	1.5	* get returns the last value set
39	dl	1.4	*/
40			public void testGetSet() {
41	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
42			assertEquals(true,ai.get());
43			ai.set(false);
44			assertEquals(false,ai.get());
45			ai.set(true);
46			assertEquals(true,ai.get());
47	jsr166	1.10
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			assertEquals(true,ai.get());
56			ai.lazySet(false);
57			assertEquals(false,ai.get());
58			ai.lazySet(true);
59			assertEquals(true,ai.get());
60	jsr166	1.10
61	dl	1.9	}
62
63			/**
64	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
65	dl	1.4	*/
66			public void testCompareAndSet() {
67	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
68			assertTrue(ai.compareAndSet(true,false));
69			assertEquals(false,ai.get());
70			assertTrue(ai.compareAndSet(false,false));
71			assertEquals(false,ai.get());
72			assertFalse(ai.compareAndSet(true,false));
73			assertFalse((ai.get()));
74			assertTrue(ai.compareAndSet(false,true));
75			assertEquals(true,ai.get());
76			}
77
78	dl	1.4	/**
79	dl	1.5	* compareAndSet in one thread enables another waiting for value
80			* to succeed
81			*/
82			public void testCompareAndSetInMultipleThreads() {
83			final AtomicBoolean ai = new AtomicBoolean(true);
84			Thread t = new Thread(new Runnable() {
85			public void run() {
86	jsr166	1.11	while (!ai.compareAndSet(false, true)) Thread.yield();
87	dl	1.5	}});
88			try {
89			t.start();
90			assertTrue(ai.compareAndSet(true, false));
91			t.join(LONG_DELAY_MS);
92			assertFalse(t.isAlive());
93			}
94	jsr166	1.11	catch (Exception e) {
95	dl	1.5	unexpectedException();
96			}
97			}
98
99			/**
100			* repeated weakCompareAndSet succeeds in changing value when equal
101	jsr166	1.10	* to expected
102	dl	1.4	*/
103			public void testWeakCompareAndSet() {
104	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
105	jsr166	1.11	while (!ai.weakCompareAndSet(true,false));
106	dl	1.1	assertEquals(false,ai.get());
107	jsr166	1.11	while (!ai.weakCompareAndSet(false,false));
108	dl	1.1	assertEquals(false,ai.get());
109	jsr166	1.11	while (!ai.weakCompareAndSet(false,true));
110	dl	1.1	assertEquals(true,ai.get());
111			}
112
113	dl	1.4	/**
114	dl	1.5	* getAndSet returns previous value and sets to given value
115	dl	1.4	*/
116			public void testGetAndSet() {
117	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
118			assertEquals(true,ai.getAndSet(false));
119			assertEquals(false,ai.getAndSet(false));
120			assertEquals(false,ai.getAndSet(true));
121			assertEquals(true,ai.get());
122	dl	1.2	}
123
124	dl	1.4	/**
125	dl	1.5	* a deserialized serialized atomic holds same value
126	dl	1.4	*/
127	dl	1.2	public void testSerialization() {
128			AtomicBoolean l = new AtomicBoolean();
129
130			try {
131			l.set(true);
132			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
133			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
134			out.writeObject(l);
135			out.close();
136
137			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
138			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
139			AtomicBoolean r = (AtomicBoolean) in.readObject();
140			assertEquals(l.get(), r.get());
141	jsr166	1.12	} catch (Exception e) {
142	dl	1.2	e.printStackTrace();
143	dl	1.4	unexpectedException();
144	dl	1.2	}
145	dl	1.1	}
146
147	dl	1.8	/**
148			* toString returns current value.
149	jsr166	1.10	*/
150	dl	1.8	public void testToString() {
151	jsr166	1.10	AtomicBoolean ai = new AtomicBoolean();
152	dl	1.8	assertEquals(ai.toString(), Boolean.toString(false));
153			ai.set(true);
154			assertEquals(ai.toString(), Boolean.toString(true));
155			}
156	dl	1.1
157			}