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());
        
    }

    /**
     * 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();
        }
    }


}
Revision:	1.7
Committed:	Mon Dec 29 19:05:40 2003 UTC (20 years, 4 months ago) by dl
Branch:	MAIN
Changes since 1.6:	+1 -1 lines
Log Message:	spellcheck
#	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			* 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
48			}
49	dl	1.5
50	dl	1.4	/**
51	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
52	dl	1.4	*/
53			public void testCompareAndSet() {
54	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
55			assertTrue(ai.compareAndSet(true,false));
56			assertEquals(false,ai.get());
57			assertTrue(ai.compareAndSet(false,false));
58			assertEquals(false,ai.get());
59			assertFalse(ai.compareAndSet(true,false));
60			assertFalse((ai.get()));
61			assertTrue(ai.compareAndSet(false,true));
62			assertEquals(true,ai.get());
63			}
64
65	dl	1.4	/**
66	dl	1.5	* compareAndSet in one thread enables another waiting for value
67			* to succeed
68			*/
69			public void testCompareAndSetInMultipleThreads() {
70			final AtomicBoolean ai = new AtomicBoolean(true);
71			Thread t = new Thread(new Runnable() {
72			public void run() {
73			while(!ai.compareAndSet(false, true)) Thread.yield();
74			}});
75			try {
76			t.start();
77			assertTrue(ai.compareAndSet(true, false));
78			t.join(LONG_DELAY_MS);
79			assertFalse(t.isAlive());
80			}
81			catch(Exception e) {
82			unexpectedException();
83			}
84			}
85
86			/**
87			* repeated weakCompareAndSet succeeds in changing value when equal
88			* to expected
89	dl	1.4	*/
90			public void testWeakCompareAndSet() {
91	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
92			while(!ai.weakCompareAndSet(true,false));
93			assertEquals(false,ai.get());
94			while(!ai.weakCompareAndSet(false,false));
95			assertEquals(false,ai.get());
96			while(!ai.weakCompareAndSet(false,true));
97			assertEquals(true,ai.get());
98			}
99
100	dl	1.4	/**
101	dl	1.5	* getAndSet returns previous value and sets to given value
102	dl	1.4	*/
103			public void testGetAndSet() {
104	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
105			assertEquals(true,ai.getAndSet(false));
106			assertEquals(false,ai.getAndSet(false));
107			assertEquals(false,ai.getAndSet(true));
108			assertEquals(true,ai.get());
109	dl	1.2	}
110
111	dl	1.4	/**
112	dl	1.5	* a deserialized serialized atomic holds same value
113	dl	1.4	*/
114	dl	1.2	public void testSerialization() {
115			AtomicBoolean l = new AtomicBoolean();
116
117			try {
118			l.set(true);
119			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
120			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
121			out.writeObject(l);
122			out.close();
123
124			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
125			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
126			AtomicBoolean r = (AtomicBoolean) in.readObject();
127			assertEquals(l.get(), r.get());
128			} catch(Exception e){
129			e.printStackTrace();
130	dl	1.4	unexpectedException();
131	dl	1.2	}
132	dl	1.1	}
133
134
135			}