test/tck/AtomicLongFieldUpdaterTest.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 AtomicLongFieldUpdaterTest extends JSR166TestCase {
    volatile long x = 0;
    int z;
    long w;

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

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

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

    /**
     * construction with non-volatile field throws RuntimeException
     */
    public void testConstructor3(){
        try{
            AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 
                a = AtomicLongFieldUpdater.newUpdater
                (AtomicLongFieldUpdaterTest.class, "w");
            shouldThrow();
        }

        catch (RuntimeException rt) {}
    }

    /**
     *  get returns the last value set or assigned
     */
    public void testGetSet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.get(this));
        a.set(this,2);
        assertEquals(2,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(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertTrue(a.compareAndSet(this,1,2));
        assertTrue(a.compareAndSet(this,2,-4));
        assertEquals(-4,a.get(this));
        assertFalse(a.compareAndSet(this,-5,7));
        assertFalse((7 == a.get(this)));
        assertTrue(a.compareAndSet(this,-4,7));
        assertEquals(7,a.get(this));
    }


    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() {
        x = 1;
        final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");

        Thread t = new Thread(new Runnable() {
                public void run() {
                    while(!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) Thread.yield();
                }});
        try {
            t.start();
            assertTrue(a.compareAndSet(this, 1, 2));
            t.join(LONG_DELAY_MS);
            assertFalse(t.isAlive());
            assertEquals(a.get(this), 3);
        }
        catch(Exception e) {
            unexpectedException();
        }
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected 
     */
    public void testWeakCompareAndSet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        while(!a.weakCompareAndSet(this,1,2));
        while(!a.weakCompareAndSet(this,2,-4));
        assertEquals(-4,a.get(this));
        while(!a.weakCompareAndSet(this,-4,7));
        assertEquals(7,a.get(this));
    }

    /**
     *  getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndSet(this, 0));
        assertEquals(0,a.getAndSet(this,-10));
        assertEquals(-10,a.getAndSet(this,1));
    }

    /**
     * getAndAdd returns previous value and adds given value
     */
    public void testGetAndAdd(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndAdd(this,2));
        assertEquals(3,a.get(this));
        assertEquals(3,a.getAndAdd(this,-4));
        assertEquals(-1,a.get(this));
    }

    /**
     * getAndDecrement returns previous value and decrements
     */
    public void testGetAndDecrement(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndDecrement(this));
        assertEquals(0,a.getAndDecrement(this));
        assertEquals(-1,a.getAndDecrement(this));
    }

    /**
     * getAndIncrement returns previous value and increments
     */
    public void testGetAndIncrement(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndIncrement(this));
        assertEquals(2,a.get(this));
        a.set(this,-2);
        assertEquals(-2,a.getAndIncrement(this));
        assertEquals(-1,a.getAndIncrement(this));
        assertEquals(0,a.getAndIncrement(this));
        assertEquals(1,a.get(this));
    }

    /**
     * addAndGet adds given value to current, and returns current value
     */
    public void testAddAndGet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(3,a.addAndGet(this,2));
        assertEquals(3,a.get(this));
        assertEquals(-1,a.addAndGet(this,-4));
        assertEquals(-1,a.get(this));
    }

    /**
     *  decrementAndGet decrements and returns current value
     */
    public void testDecrementAndGet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(0,a.decrementAndGet(this));
        assertEquals(-1,a.decrementAndGet(this));
        assertEquals(-2,a.decrementAndGet(this));
        assertEquals(-2,a.get(this));
    }

    /**
     * incrementAndGet increments and returns current value
     */
    public void testIncrementAndGet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(2,a.incrementAndGet(this));
        assertEquals(2,a.get(this));
        a.set(this,-2);
        assertEquals(-1,a.incrementAndGet(this));
        assertEquals(0,a.incrementAndGet(this));
        assertEquals(1,a.incrementAndGet(this));
        assertEquals(1,a.get(this));
    }

}
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 AtomicLongFieldUpdaterTest extends JSR166TestCase {
14	dl	1.1	volatile long x = 0;
15	dl	1.4	int z;
16			long w;
17	dl	1.1
18			public static void main(String[] args){
19			junit.textui.TestRunner.run(suite());
20			}
21			public static Test suite() {
22			return new TestSuite(AtomicLongFieldUpdaterTest.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			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
31			a = AtomicLongFieldUpdater.newUpdater
32	dl	1.5	(AtomicLongFieldUpdaterTest.class, "y");
33	dl	1.3	shouldThrow();
34	dl	1.1	}
35			catch (RuntimeException rt) {}
36			}
37
38	dl	1.3	/**
39	dl	1.4	* construction with field not of given type throws RuntimeException
40	dl	1.3	*/
41	dl	1.1	public void testConstructor2(){
42			try{
43			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
44			a = AtomicLongFieldUpdater.newUpdater
45	dl	1.5	(AtomicLongFieldUpdaterTest.class, "z");
46	dl	1.3	shouldThrow();
47	dl	1.1	}
48			catch (RuntimeException rt) {}
49			}
50
51	dl	1.3	/**
52	dl	1.4	* construction with non-volatile field throws RuntimeException
53	dl	1.3	*/
54	dl	1.1	public void testConstructor3(){
55			try{
56			AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
57			a = AtomicLongFieldUpdater.newUpdater
58	dl	1.5	(AtomicLongFieldUpdaterTest.class, "w");
59	dl	1.3	shouldThrow();
60	dl	1.1	}
61
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	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
70	dl	1.1	x = 1;
71			assertEquals(1,a.get(this));
72			a.set(this,2);
73			assertEquals(2,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	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
83	dl	1.1	x = 1;
84			assertTrue(a.compareAndSet(this,1,2));
85			assertTrue(a.compareAndSet(this,2,-4));
86			assertEquals(-4,a.get(this));
87			assertFalse(a.compareAndSet(this,-5,7));
88			assertFalse((7 == a.get(this)));
89			assertTrue(a.compareAndSet(this,-4,7));
90			assertEquals(7,a.get(this));
91			}
92
93	dl	1.4
94			/**
95			* compareAndSet in one thread enables another waiting for value
96			* to succeed
97			*/
98			public void testCompareAndSetInMultipleThreads() {
99			x = 1;
100	dl	1.5	final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
101	dl	1.4
102			Thread t = new Thread(new Runnable() {
103			public void run() {
104			while(!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) Thread.yield();
105			}});
106			try {
107			t.start();
108			assertTrue(a.compareAndSet(this, 1, 2));
109			t.join(LONG_DELAY_MS);
110			assertFalse(t.isAlive());
111			assertEquals(a.get(this), 3);
112			}
113			catch(Exception e) {
114			unexpectedException();
115			}
116			}
117
118	dl	1.3	/**
119	dl	1.4	* repeated weakCompareAndSet succeeds in changing value when equal
120			* to expected
121	dl	1.3	*/
122	dl	1.1	public void testWeakCompareAndSet(){
123	dl	1.5	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
124	dl	1.1	x = 1;
125			while(!a.weakCompareAndSet(this,1,2));
126			while(!a.weakCompareAndSet(this,2,-4));
127			assertEquals(-4,a.get(this));
128			while(!a.weakCompareAndSet(this,-4,7));
129			assertEquals(7,a.get(this));
130			}
131
132	dl	1.3	/**
133	dl	1.4	* getAndSet returns previous value and sets to given value
134	dl	1.3	*/
135	dl	1.1	public void testGetAndSet(){
136	dl	1.5	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
137	dl	1.1	x = 1;
138			assertEquals(1,a.getAndSet(this, 0));
139			assertEquals(0,a.getAndSet(this,-10));
140			assertEquals(-10,a.getAndSet(this,1));
141			}
142
143	dl	1.3	/**
144	dl	1.4	* getAndAdd returns previous value and adds given value
145	dl	1.3	*/
146	dl	1.1	public void testGetAndAdd(){
147	dl	1.5	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
148	dl	1.1	x = 1;
149			assertEquals(1,a.getAndAdd(this,2));
150			assertEquals(3,a.get(this));
151			assertEquals(3,a.getAndAdd(this,-4));
152			assertEquals(-1,a.get(this));
153			}
154
155	dl	1.3	/**
156	dl	1.4	* getAndDecrement returns previous value and decrements
157	dl	1.3	*/
158	dl	1.1	public void testGetAndDecrement(){
159	dl	1.5	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
160	dl	1.1	x = 1;
161			assertEquals(1,a.getAndDecrement(this));
162			assertEquals(0,a.getAndDecrement(this));
163			assertEquals(-1,a.getAndDecrement(this));
164			}
165
166	dl	1.3	/**
167	dl	1.4	* getAndIncrement returns previous value and increments
168	dl	1.3	*/
169	dl	1.1	public void testGetAndIncrement(){
170	dl	1.5	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
171	dl	1.1	x = 1;
172			assertEquals(1,a.getAndIncrement(this));
173			assertEquals(2,a.get(this));
174			a.set(this,-2);
175			assertEquals(-2,a.getAndIncrement(this));
176			assertEquals(-1,a.getAndIncrement(this));
177			assertEquals(0,a.getAndIncrement(this));
178			assertEquals(1,a.get(this));
179			}
180
181	dl	1.3	/**
182	dl	1.4	* addAndGet adds given value to current, and returns current value
183	dl	1.3	*/
184	dl	1.1	public void testAddAndGet(){
185	dl	1.5	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
186	dl	1.1	x = 1;
187			assertEquals(3,a.addAndGet(this,2));
188			assertEquals(3,a.get(this));
189			assertEquals(-1,a.addAndGet(this,-4));
190			assertEquals(-1,a.get(this));
191			}
192
193	dl	1.3	/**
194	dl	1.4	* decrementAndGet decrements and returns current value
195	dl	1.3	*/
196	dl	1.1	public void testDecrementAndGet(){
197	dl	1.5	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
198	dl	1.1	x = 1;
199			assertEquals(0,a.decrementAndGet(this));
200			assertEquals(-1,a.decrementAndGet(this));
201			assertEquals(-2,a.decrementAndGet(this));
202			assertEquals(-2,a.get(this));
203			}
204
205	dl	1.3	/**
206	dl	1.4	* incrementAndGet increments and returns current value
207	dl	1.3	*/
208	dl	1.1	public void testIncrementAndGet(){
209	dl	1.5	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
210	dl	1.1	x = 1;
211			assertEquals(2,a.incrementAndGet(this));
212			assertEquals(2,a.get(this));
213			a.set(this,-2);
214			assertEquals(-1,a.incrementAndGet(this));
215			assertEquals(0,a.incrementAndGet(this));
216			assertEquals(1,a.incrementAndGet(this));
217			assertEquals(1,a.get(this));
218			}
219
220			}