test/tck/AtomicReferenceTest.java

/*
 * Written by members of JCP JSR-166 Expert Group and released to the
 * public domain. Use, modify, and redistribute this code in any way
 * without acknowledgement. Other contributors include Andrew Wright,
 * Jeffrey Hayes, Pat Fischer, 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();
        }
    }

}

Revision:	1.5
Committed:	Thu Sep 25 11:02:41 2003 UTC (20 years, 7 months ago) by dl
Branch:	MAIN
CVS Tags:	JSR166_NOV3_FREEZE, JSR166_DEC9_PRE_ES_SUBMIT, JSR166_DEC9_POST_ES_SUBMIT
Changes since 1.4:	+30 -7 lines
Log Message:	improve tck javadocs; rename and add a few tests
#	User	Rev	Content
1	dl	1.1	/*
2			* Written by members of JCP JSR-166 Expert Group and released to the
3			* public domain. Use, modify, and redistribute this code in any way
4			* without acknowledgement. Other contributors include Andrew Wright,
5			* Jeffrey Hayes, Pat Fischer, Mike Judd.
6			*/
7
8			import junit.framework.*;
9			import java.util.concurrent.atomic.*;
10	dl	1.2	import java.io.*;
11	dl	1.1
12	dl	1.3	public class AtomicReferenceTest extends JSR166TestCase {
13	dl	1.1	public static void main (String[] args) {
14			junit.textui.TestRunner.run (suite());
15			}
16			public static Test suite() {
17			return new TestSuite(AtomicReferenceTest.class);
18			}
19
20	dl	1.4	/**
21	dl	1.5	* constructor initializes to given value
22	dl	1.4	*/
23	dl	1.1	public void testConstructor(){
24			AtomicReference ai = new AtomicReference(one);
25			assertEquals(one,ai.get());
26			}
27
28	dl	1.4	/**
29	dl	1.5	* default constructed initializes to null
30	dl	1.4	*/
31	dl	1.1	public void testConstructor2(){
32			AtomicReference ai = new AtomicReference();
33			assertNull(ai.get());
34			}
35
36	dl	1.4	/**
37	dl	1.5	* get returns the last value set
38	dl	1.4	*/
39	dl	1.1	public void testGetSet(){
40			AtomicReference ai = new AtomicReference(one);
41			assertEquals(one,ai.get());
42			ai.set(two);
43			assertEquals(two,ai.get());
44			ai.set(m3);
45			assertEquals(m3,ai.get());
46
47			}
48	dl	1.4	/**
49	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
50	dl	1.4	*/
51	dl	1.1	public void testCompareAndSet(){
52			AtomicReference ai = new AtomicReference(one);
53			assertTrue(ai.compareAndSet(one,two));
54			assertTrue(ai.compareAndSet(two,m4));
55			assertEquals(m4,ai.get());
56			assertFalse(ai.compareAndSet(m5,seven));
57			assertFalse((seven.equals(ai.get())));
58			assertTrue(ai.compareAndSet(m4,seven));
59			assertEquals(seven,ai.get());
60			}
61
62	dl	1.4	/**
63	dl	1.5	* compareAndSet in one thread enables another waiting for value
64			* to succeed
65			*/
66			public void testCompareAndSetInMultipleThreads() {
67			final AtomicReference ai = new AtomicReference(one);
68			Thread t = new Thread(new Runnable() {
69			public void run() {
70			while(!ai.compareAndSet(two, three)) Thread.yield();
71			}});
72			try {
73			t.start();
74			assertTrue(ai.compareAndSet(one, two));
75			t.join(LONG_DELAY_MS);
76			assertFalse(t.isAlive());
77			assertEquals(ai.get(), three);
78			}
79			catch(Exception e) {
80			unexpectedException();
81			}
82			}
83
84			/**
85			* repeated weakCompareAndSet succeeds in changing value when equal
86			* to expected
87	dl	1.4	*/
88	dl	1.1	public void testWeakCompareAndSet(){
89			AtomicReference ai = new AtomicReference(one);
90			while(!ai.weakCompareAndSet(one,two));
91			while(!ai.weakCompareAndSet(two,m4));
92			assertEquals(m4,ai.get());
93			while(!ai.weakCompareAndSet(m4,seven));
94			assertEquals(seven,ai.get());
95			}
96
97	dl	1.4	/**
98	dl	1.5	* getAndSet returns previous value and sets to given value
99	dl	1.4	*/
100	dl	1.1	public void testGetAndSet(){
101			AtomicReference ai = new AtomicReference(one);
102			assertEquals(one,ai.getAndSet(zero));
103			assertEquals(zero,ai.getAndSet(m10));
104			assertEquals(m10,ai.getAndSet(one));
105	dl	1.2	}
106
107	dl	1.4	/**
108	dl	1.5	* a deserialized serialized atomic holds same value
109	dl	1.4	*/
110	dl	1.2	public void testSerialization() {
111			AtomicReference l = new AtomicReference();
112
113			try {
114			l.set(one);
115			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
116			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
117			out.writeObject(l);
118			out.close();
119
120			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
121			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
122			AtomicReference r = (AtomicReference) in.readObject();
123			assertEquals(l.get(), r.get());
124			} catch(Exception e){
125	dl	1.4	unexpectedException();
126	dl	1.2	}
127	dl	1.1	}
128
129			}
130