test/tck/AtomicIntegerFieldUpdaterTest.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 AtomicIntegerFieldUpdaterTest extends JSR166TestCase {
    volatile int x = 0;
    int w;
    long z;
    public static void main(String[] args){
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicIntegerFieldUpdaterTest.class);
    }

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

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

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

    /**
     *  get returns the last value set or assigned
     */
    public void testGetSet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.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 AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");

        Thread t = new Thread(new Runnable() {
                public void run() {
                    while(!a.compareAndSet(AtomicIntegerFieldUpdaterTest.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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.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() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.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
#	Content
1	/*
2	* 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	*/
8
9	import java.util.concurrent.atomic.*;
10	import junit.framework.*;
11	import java.util.*;
12
13	public class AtomicIntegerFieldUpdaterTest extends JSR166TestCase {
14	volatile int x = 0;
15	int w;
16	long z;
17	public static void main(String[] args){
18	junit.textui.TestRunner.run(suite());
19	}
20	public static Test suite() {
21	return new TestSuite(AtomicIntegerFieldUpdaterTest.class);
22	}
23
24	/**
25	* Contruction with non-existent field throws RuntimeException
26	*/
27	public void testConstructor() {
28	try{
29	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
30	a = AtomicIntegerFieldUpdater.newUpdater
31	(AtomicIntegerFieldUpdaterTest.class, "y");
32	shouldThrow();
33	}
34	catch (RuntimeException rt) {}
35	}
36
37	/**
38	* construction with field not of given type throws RuntimeException
39	*/
40	public void testConstructor2() {
41	try{
42	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
43	a = AtomicIntegerFieldUpdater.newUpdater
44	(AtomicIntegerFieldUpdaterTest.class, "z");
45	shouldThrow();
46	}
47	catch (RuntimeException rt) {}
48	}
49
50	/**
51	* construction with non-volatile field throws RuntimeException
52	*/
53	public void testConstructor3() {
54	try{
55	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
56	a = AtomicIntegerFieldUpdater.newUpdater
57	(AtomicIntegerFieldUpdaterTest.class, "w");
58	shouldThrow();
59	}
60	catch (RuntimeException rt) {}
61	}
62
63	/**
64	* get returns the last value set or assigned
65	*/
66	public void testGetSet() {
67	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
68	x = 1;
69	assertEquals(1,a.get(this));
70	a.set(this,2);
71	assertEquals(2,a.get(this));
72	a.set(this,-3);
73	assertEquals(-3,a.get(this));
74
75	}
76	/**
77	* compareAndSet succeeds in changing value if equal to expected else fails
78	*/
79	public void testCompareAndSet() {
80	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
81	x = 1;
82	assertTrue(a.compareAndSet(this,1,2));
83	assertTrue(a.compareAndSet(this,2,-4));
84	assertEquals(-4,a.get(this));
85	assertFalse(a.compareAndSet(this,-5,7));
86	assertFalse((7 == a.get(this)));
87	assertTrue(a.compareAndSet(this,-4,7));
88	assertEquals(7,a.get(this));
89	}
90
91
92	/**
93	* compareAndSet in one thread enables another waiting for value
94	* to succeed
95	*/
96	public void testCompareAndSetInMultipleThreads() {
97	x = 1;
98	final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
99
100	Thread t = new Thread(new Runnable() {
101	public void run() {
102	while(!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3)) Thread.yield();
103	}});
104	try {
105	t.start();
106	assertTrue(a.compareAndSet(this, 1, 2));
107	t.join(LONG_DELAY_MS);
108	assertFalse(t.isAlive());
109	assertEquals(a.get(this), 3);
110	}
111	catch(Exception e) {
112	unexpectedException();
113	}
114	}
115
116	/**
117	* repeated weakCompareAndSet succeeds in changing value when equal
118	* to expected
119	*/
120	public void testWeakCompareAndSet() {
121	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
122	x = 1;
123	while(!a.weakCompareAndSet(this,1,2));
124	while(!a.weakCompareAndSet(this,2,-4));
125	assertEquals(-4,a.get(this));
126	while(!a.weakCompareAndSet(this,-4,7));
127	assertEquals(7,a.get(this));
128	}
129
130	/**
131	* getAndSet returns previous value and sets to given value
132	*/
133	public void testGetAndSet() {
134	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
135	x = 1;
136	assertEquals(1,a.getAndSet(this, 0));
137	assertEquals(0,a.getAndSet(this,-10));
138	assertEquals(-10,a.getAndSet(this,1));
139	}
140
141	/**
142	* getAndAdd returns previous value and adds given value
143	*/
144	public void testGetAndAdd() {
145	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
146	x = 1;
147	assertEquals(1,a.getAndAdd(this,2));
148	assertEquals(3,a.get(this));
149	assertEquals(3,a.getAndAdd(this,-4));
150	assertEquals(-1,a.get(this));
151	}
152
153	/**
154	* getAndDecrement returns previous value and decrements
155	*/
156	public void testGetAndDecrement() {
157	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
158	x = 1;
159	assertEquals(1,a.getAndDecrement(this));
160	assertEquals(0,a.getAndDecrement(this));
161	assertEquals(-1,a.getAndDecrement(this));
162	}
163
164	/**
165	* getAndIncrement returns previous value and increments
166	*/
167	public void testGetAndIncrement() {
168	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
169	x = 1;
170	assertEquals(1,a.getAndIncrement(this));
171	assertEquals(2,a.get(this));
172	a.set(this,-2);
173	assertEquals(-2,a.getAndIncrement(this));
174	assertEquals(-1,a.getAndIncrement(this));
175	assertEquals(0,a.getAndIncrement(this));
176	assertEquals(1,a.get(this));
177	}
178
179	/**
180	* addAndGet adds given value to current, and returns current value
181	*/
182	public void testAddAndGet() {
183	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
184	x = 1;
185	assertEquals(3,a.addAndGet(this,2));
186	assertEquals(3,a.get(this));
187	assertEquals(-1,a.addAndGet(this,-4));
188	assertEquals(-1,a.get(this));
189	}
190
191	/**
192	* decrementAndGet decrements and returns current value
193	*/
194	public void testDecrementAndGet() {
195	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
196	x = 1;
197	assertEquals(0,a.decrementAndGet(this));
198	assertEquals(-1,a.decrementAndGet(this));
199	assertEquals(-2,a.decrementAndGet(this));
200	assertEquals(-2,a.get(this));
201	}
202
203	/**
204	* incrementAndGet increments and returns current value
205	*/
206	public void testIncrementAndGet() {
207	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
208	x = 1;
209	assertEquals(2,a.incrementAndGet(this));
210	assertEquals(2,a.get(this));
211	a.set(this,-2);
212	assertEquals(-1,a.incrementAndGet(this));
213	assertEquals(0,a.incrementAndGet(this));
214	assertEquals(1,a.incrementAndGet(this));
215	assertEquals(1,a.get(this));
216	}
217
218	}