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.*;
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() {
        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 l = new AtomicBoolean();

        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());
    }

    /**
     * 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:	1.18
Committed:	Tue Mar 15 19:47:06 2011 UTC (13 years, 2 months ago) by jsr166
Branch:	MAIN
CVS Tags:	release-1_7_0
Changes since 1.17:	+1 -1 lines
Log Message:	Update Creative Commons license URL in legal notices
#	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			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	jsr166	1.17	public static void main(String[] args) {
15			junit.textui.TestRunner.run(suite());
16	dl	1.1	}
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	jsr166	1.16	assertTrue(new AtomicBoolean(true).get());
26			assertFalse(new AtomicBoolean(false).get());
27	dl	1.1	}
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	jsr166	1.16	assertFalse(ai.get());
35	dl	1.1	}
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	jsr166	1.16	assertTrue(ai.get());
43	jsr166	1.15	ai.set(false);
44	jsr166	1.16	assertFalse(ai.get());
45	jsr166	1.15	ai.set(true);
46	jsr166	1.16	assertTrue(ai.get());
47	dl	1.1	}
48	dl	1.5
49	dl	1.4	/**
50	dl	1.9	* get returns the last value lazySet in same thread
51			*/
52			public void testGetLazySet() {
53			AtomicBoolean ai = new AtomicBoolean(true);
54	jsr166	1.16	assertTrue(ai.get());
55	jsr166	1.15	ai.lazySet(false);
56	jsr166	1.16	assertFalse(ai.get());
57	jsr166	1.15	ai.lazySet(true);
58	jsr166	1.16	assertTrue(ai.get());
59	dl	1.9	}
60
61			/**
62	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
63	dl	1.4	*/
64			public void testCompareAndSet() {
65	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
66	jsr166	1.15	assertTrue(ai.compareAndSet(true,false));
67	jsr166	1.16	assertFalse(ai.get());
68	jsr166	1.15	assertTrue(ai.compareAndSet(false,false));
69	jsr166	1.16	assertFalse(ai.get());
70	jsr166	1.15	assertFalse(ai.compareAndSet(true,false));
71	jsr166	1.16	assertFalse(ai.get());
72	jsr166	1.15	assertTrue(ai.compareAndSet(false,true));
73	jsr166	1.16	assertTrue(ai.get());
74	dl	1.1	}
75
76	dl	1.4	/**
77	dl	1.5	* compareAndSet in one thread enables another waiting for value
78			* to succeed
79			*/
80	jsr166	1.13	public void testCompareAndSetInMultipleThreads() throws Exception {
81	dl	1.5	final AtomicBoolean ai = new AtomicBoolean(true);
82	jsr166	1.14	Thread t = new Thread(new CheckedRunnable() {
83			public void realRun() {
84			while (!ai.compareAndSet(false, true)) Thread.yield();
85			}});
86	jsr166	1.13
87			t.start();
88			assertTrue(ai.compareAndSet(true, false));
89			t.join(LONG_DELAY_MS);
90			assertFalse(t.isAlive());
91	dl	1.5	}
92
93			/**
94			* repeated weakCompareAndSet succeeds in changing value when equal
95	jsr166	1.10	* to expected
96	dl	1.4	*/
97			public void testWeakCompareAndSet() {
98	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
99	jsr166	1.15	while (!ai.weakCompareAndSet(true,false));
100	jsr166	1.16	assertFalse(ai.get());
101	jsr166	1.15	while (!ai.weakCompareAndSet(false,false));
102	jsr166	1.16	assertFalse(ai.get());
103	jsr166	1.11	while (!ai.weakCompareAndSet(false,true));
104	jsr166	1.16	assertTrue(ai.get());
105	dl	1.1	}
106
107	dl	1.4	/**
108	dl	1.5	* getAndSet returns previous value and sets to given value
109	dl	1.4	*/
110			public void testGetAndSet() {
111	dl	1.1	AtomicBoolean ai = new AtomicBoolean(true);
112	jsr166	1.15	assertEquals(true,ai.getAndSet(false));
113			assertEquals(false,ai.getAndSet(false));
114			assertEquals(false,ai.getAndSet(true));
115	jsr166	1.16	assertTrue(ai.get());
116	dl	1.2	}
117
118	dl	1.4	/**
119	dl	1.5	* a deserialized serialized atomic holds same value
120	dl	1.4	*/
121	jsr166	1.13	public void testSerialization() throws Exception {
122	dl	1.2	AtomicBoolean l = new AtomicBoolean();
123
124	jsr166	1.13	l.set(true);
125			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
126			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
127			out.writeObject(l);
128			out.close();
129
130			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
131			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
132			AtomicBoolean r = (AtomicBoolean) in.readObject();
133			assertEquals(l.get(), r.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	dl	1.8	assertEquals(ai.toString(), Boolean.toString(false));
142			ai.set(true);
143			assertEquals(ai.toString(), Boolean.toString(true));
144			}
145	dl	1.1
146			}