test/tck/AtomicReferenceTest.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 AtomicReferenceTest extends JSR166TestCase {
    public static void main (String[] args) {
        junit.textui.TestRunner.run (suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicReferenceTest.class);
    }

    /**
     * constructor initializes to given value
     */
    public void testConstructor(){
        AtomicReference ai = new AtomicReference(one);
        assertEquals(one,ai.get());
    }

    /**
     * default constructed initializes to null
     */
    public void testConstructor2(){
        AtomicReference ai = new AtomicReference();
        assertNull(ai.get());
    }

    /**
     * get returns the last value set
     */
    public void testGetSet(){
        AtomicReference ai = new AtomicReference(one);
        assertEquals(one,ai.get());
        ai.set(two);
        assertEquals(two,ai.get());
        ai.set(m3);
        assertEquals(m3,ai.get());
        
    }
    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet(){
        AtomicReference ai = new AtomicReference(one);
        assertTrue(ai.compareAndSet(one,two));
        assertTrue(ai.compareAndSet(two,m4));
        assertEquals(m4,ai.get());
        assertFalse(ai.compareAndSet(m5,seven));
        assertFalse((seven.equals(ai.get())));
        assertTrue(ai.compareAndSet(m4,seven));
        assertEquals(seven,ai.get());
    }

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

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected 
     */
    public void testWeakCompareAndSet(){
        AtomicReference ai = new AtomicReference(one);
        while(!ai.weakCompareAndSet(one,two));
        while(!ai.weakCompareAndSet(two,m4));
        assertEquals(m4,ai.get());
        while(!ai.weakCompareAndSet(m4,seven));
        assertEquals(seven,ai.get());
    }

    /**
     * getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet(){
        AtomicReference ai = new AtomicReference(one);
        assertEquals(one,ai.getAndSet(zero));
        assertEquals(zero,ai.getAndSet(m10));
        assertEquals(m10,ai.getAndSet(one));
    }

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

        try {
            l.set(one);
            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));
            AtomicReference r = (AtomicReference) in.readObject();
            assertEquals(l.get(), r.get());
        } catch(Exception e){
            unexpectedException();
        }
    }

    /**
     * toString returns current value.
     */ 
    public void testToString() {
        AtomicReference<Integer> ai = new AtomicReference<Integer>(one); 
        assertEquals(ai.toString(), one.toString());
        ai.set(two);
        assertEquals(ai.toString(), two.toString());
    }

}

Revision:	1.7
Committed:	Fri Jan 9 20:07:36 2004 UTC (20 years, 3 months ago) by dl
Branch:	MAIN
CVS Tags:	JSR166_PFD
Changes since 1.6:	+10 -0 lines
Log Message:	Tests for toString methods
#	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 AtomicReferenceTest 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(AtomicReferenceTest.class);
19			}
20
21	dl	1.4	/**
22	dl	1.5	* constructor initializes to given value
23	dl	1.4	*/
24	dl	1.1	public void testConstructor(){
25			AtomicReference ai = new AtomicReference(one);
26			assertEquals(one,ai.get());
27			}
28
29	dl	1.4	/**
30	dl	1.5	* default constructed initializes to null
31	dl	1.4	*/
32	dl	1.1	public void testConstructor2(){
33			AtomicReference ai = new AtomicReference();
34			assertNull(ai.get());
35			}
36
37	dl	1.4	/**
38	dl	1.5	* get returns the last value set
39	dl	1.4	*/
40	dl	1.1	public void testGetSet(){
41			AtomicReference ai = new AtomicReference(one);
42			assertEquals(one,ai.get());
43			ai.set(two);
44			assertEquals(two,ai.get());
45			ai.set(m3);
46			assertEquals(m3,ai.get());
47
48			}
49	dl	1.4	/**
50	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
51	dl	1.4	*/
52	dl	1.1	public void testCompareAndSet(){
53			AtomicReference ai = new AtomicReference(one);
54			assertTrue(ai.compareAndSet(one,two));
55			assertTrue(ai.compareAndSet(two,m4));
56			assertEquals(m4,ai.get());
57			assertFalse(ai.compareAndSet(m5,seven));
58			assertFalse((seven.equals(ai.get())));
59			assertTrue(ai.compareAndSet(m4,seven));
60			assertEquals(seven,ai.get());
61			}
62
63	dl	1.4	/**
64	dl	1.5	* compareAndSet in one thread enables another waiting for value
65			* to succeed
66			*/
67			public void testCompareAndSetInMultipleThreads() {
68			final AtomicReference ai = new AtomicReference(one);
69			Thread t = new Thread(new Runnable() {
70			public void run() {
71			while(!ai.compareAndSet(two, three)) Thread.yield();
72			}});
73			try {
74			t.start();
75			assertTrue(ai.compareAndSet(one, two));
76			t.join(LONG_DELAY_MS);
77			assertFalse(t.isAlive());
78			assertEquals(ai.get(), three);
79			}
80			catch(Exception e) {
81			unexpectedException();
82			}
83			}
84
85			/**
86			* repeated weakCompareAndSet succeeds in changing value when equal
87			* to expected
88	dl	1.4	*/
89	dl	1.1	public void testWeakCompareAndSet(){
90			AtomicReference ai = new AtomicReference(one);
91			while(!ai.weakCompareAndSet(one,two));
92			while(!ai.weakCompareAndSet(two,m4));
93			assertEquals(m4,ai.get());
94			while(!ai.weakCompareAndSet(m4,seven));
95			assertEquals(seven,ai.get());
96			}
97
98	dl	1.4	/**
99	dl	1.5	* getAndSet returns previous value and sets to given value
100	dl	1.4	*/
101	dl	1.1	public void testGetAndSet(){
102			AtomicReference ai = new AtomicReference(one);
103			assertEquals(one,ai.getAndSet(zero));
104			assertEquals(zero,ai.getAndSet(m10));
105			assertEquals(m10,ai.getAndSet(one));
106	dl	1.2	}
107
108	dl	1.4	/**
109	dl	1.5	* a deserialized serialized atomic holds same value
110	dl	1.4	*/
111	dl	1.2	public void testSerialization() {
112			AtomicReference l = new AtomicReference();
113
114			try {
115			l.set(one);
116			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
117			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
118			out.writeObject(l);
119			out.close();
120
121			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
122			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
123			AtomicReference r = (AtomicReference) in.readObject();
124			assertEquals(l.get(), r.get());
125			} catch(Exception e){
126	dl	1.4	unexpectedException();
127	dl	1.2	}
128	dl	1.1	}
129
130	dl	1.7	/**
131			* toString returns current value.
132			*/
133			public void testToString() {
134			AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
135			assertEquals(ai.toString(), one.toString());
136			ai.set(two);
137			assertEquals(ai.toString(), two.toString());
138			}
139
140	dl	1.1	}
141