test/tck/AtomicReferenceFieldUpdaterTest.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 java.util.concurrent.atomic.*;
import junit.framework.*;
import java.util.*;

public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase{
    volatile Integer x = null;
    Object z;
    Integer w;

    public static void main(String[] args){
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
    }

    /**
     * Contruction with non-existent field throws RuntimeException
     */
    public void testConstructor(){
        try{
            AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
                a = AtomicReferenceFieldUpdater.newUpdater
                (AtomicReferenceFieldUpdaterTest.class, Integer.class, "y");
            shouldThrow();
        }
        catch (RuntimeException rt) {}
    }


    /**
     * construction with field not of given type throws RuntimeException
     */
    public void testConstructor2(){
        try{
            AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
                a = AtomicReferenceFieldUpdater.newUpdater
                (AtomicReferenceFieldUpdaterTest.class, Integer.class, "z");
            shouldThrow();
        }
        catch (RuntimeException rt) {}
    }

    /**
     * Constructor with non-volatile field throws exception
     */
    public void testConstructor3(){
        try{
            AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
                a = AtomicReferenceFieldUpdater.newUpdater
                (AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
            shouldThrow();
        }
        catch (RuntimeException rt) {}
    }

    /**
     *  get returns the last value set or assigned
     */
    public void testGetSet(){
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
        x = one;
        assertEquals(one,a.get(this));
        a.set(this,two);
        assertEquals(two,a.get(this));
        a.set(this,-3);
        assertEquals(-3,a.get(this));
        
    }
    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet(){
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
        x = one;
        assertTrue(a.compareAndSet(this,one,two));
        assertTrue(a.compareAndSet(this,two,m4));
        assertEquals(m4,a.get(this));
        assertFalse(a.compareAndSet(this,m5,seven));
        assertFalse((seven == a.get(this)));
        assertTrue(a.compareAndSet(this,m4,seven));
        assertEquals(seven,a.get(this));
    }

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() {
        x = one;
        final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");

        Thread t = new Thread(new Runnable() {
                public void run() {
                    while(!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three)) Thread.yield();
                }});
        try {
            t.start();
            assertTrue(a.compareAndSet(this, one, two));
            t.join(LONG_DELAY_MS);
            assertFalse(t.isAlive());
            assertEquals(a.get(this), three);
        }
        catch(Exception e) {
            unexpectedException();
        }
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected 
     */
    public void testWeakCompareAndSet(){
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
        x = one;
        while(!a.weakCompareAndSet(this,one,two));
        while(!a.weakCompareAndSet(this,two,m4));
        assertEquals(m4,a.get(this));
        while(!a.weakCompareAndSet(this,m4,seven));
        assertEquals(seven,a.get(this));
    }

    /**
     * getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet(){
        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
        x = one;
        assertEquals(one,a.getAndSet(this, zero));
        assertEquals(zero,a.getAndSet(this,m10));
        assertEquals(m10,a.getAndSet(this,1));
    }

}
Revision:	1.6
Committed:	Sat Dec 27 19:26:43 2003 UTC (20 years, 4 months ago) by dl
Branch:	MAIN
Changes since 1.5:	+5 -4 lines
Log Message:	Headers reference Creative Commons
#	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 java.util.concurrent.atomic.*;
10			import junit.framework.*;
11			import java.util.*;
12
13	dl	1.2	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase{
14	dl	1.1	volatile Integer x = null;
15			Object z;
16			Integer w;
17
18			public static void main(String[] args){
19			junit.textui.TestRunner.run(suite());
20			}
21			public static Test suite() {
22			return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
23			}
24
25	dl	1.3	/**
26	dl	1.4	* Contruction with non-existent field throws RuntimeException
27	dl	1.3	*/
28	dl	1.1	public void testConstructor(){
29			try{
30			AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
31			a = AtomicReferenceFieldUpdater.newUpdater
32	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "y");
33	dl	1.3	shouldThrow();
34	dl	1.1	}
35			catch (RuntimeException rt) {}
36			}
37
38
39	dl	1.3	/**
40	dl	1.4	* construction with field not of given type throws RuntimeException
41	dl	1.3	*/
42	dl	1.1	public void testConstructor2(){
43			try{
44			AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
45			a = AtomicReferenceFieldUpdater.newUpdater
46	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "z");
47	dl	1.3	shouldThrow();
48	dl	1.1	}
49			catch (RuntimeException rt) {}
50			}
51
52	dl	1.3	/**
53	dl	1.4	* Constructor with non-volatile field throws exception
54	dl	1.3	*/
55	dl	1.1	public void testConstructor3(){
56			try{
57			AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
58			a = AtomicReferenceFieldUpdater.newUpdater
59	dl	1.5	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
60	dl	1.3	shouldThrow();
61	dl	1.1	}
62			catch (RuntimeException rt) {}
63			}
64
65	dl	1.3	/**
66	dl	1.4	* get returns the last value set or assigned
67	dl	1.3	*/
68	dl	1.1	public void testGetSet(){
69	dl	1.5	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
70	dl	1.1	x = one;
71			assertEquals(one,a.get(this));
72			a.set(this,two);
73			assertEquals(two,a.get(this));
74			a.set(this,-3);
75			assertEquals(-3,a.get(this));
76
77			}
78	dl	1.3	/**
79	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
80	dl	1.3	*/
81	dl	1.1	public void testCompareAndSet(){
82	dl	1.5	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
83	dl	1.1	x = one;
84			assertTrue(a.compareAndSet(this,one,two));
85			assertTrue(a.compareAndSet(this,two,m4));
86			assertEquals(m4,a.get(this));
87			assertFalse(a.compareAndSet(this,m5,seven));
88			assertFalse((seven == a.get(this)));
89			assertTrue(a.compareAndSet(this,m4,seven));
90			assertEquals(seven,a.get(this));
91			}
92
93	dl	1.3	/**
94	dl	1.4	* compareAndSet in one thread enables another waiting for value
95			* to succeed
96			*/
97			public void testCompareAndSetInMultipleThreads() {
98			x = one;
99	dl	1.5	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
100	dl	1.4
101			Thread t = new Thread(new Runnable() {
102			public void run() {
103			while(!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three)) Thread.yield();
104			}});
105			try {
106			t.start();
107			assertTrue(a.compareAndSet(this, one, two));
108			t.join(LONG_DELAY_MS);
109			assertFalse(t.isAlive());
110			assertEquals(a.get(this), three);
111			}
112			catch(Exception e) {
113			unexpectedException();
114			}
115			}
116
117			/**
118			* repeated weakCompareAndSet succeeds in changing value when equal
119			* to expected
120	dl	1.3	*/
121	dl	1.1	public void testWeakCompareAndSet(){
122	dl	1.5	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
123	dl	1.1	x = one;
124			while(!a.weakCompareAndSet(this,one,two));
125			while(!a.weakCompareAndSet(this,two,m4));
126			assertEquals(m4,a.get(this));
127			while(!a.weakCompareAndSet(this,m4,seven));
128			assertEquals(seven,a.get(this));
129			}
130
131	dl	1.3	/**
132	dl	1.4	* getAndSet returns previous value and sets to given value
133	dl	1.3	*/
134	dl	1.1	public void testGetAndSet(){
135	dl	1.5	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
136	dl	1.1	x = one;
137			assertEquals(one,a.getAndSet(this, zero));
138			assertEquals(zero,a.getAndSet(this,m10));
139			assertEquals(m10,a.getAndSet(this,1));
140			}
141
142			}