test/tck/AtomicIntegerFieldUpdaterTest.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 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
                (getClass(), "y");
            shouldThrow();
        }
        catch (RuntimeException rt) {}
    }

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

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

    /**
     *  get returns the last value set or assigned
     */
    public void testGetSet() {
        AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "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(getClass(), "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(getClass(), "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(getClass(), "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(getClass(), "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(getClass(), "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(getClass(), "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(getClass(), "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(getClass(), "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(getClass(), "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(getClass(), "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:	1.4
Committed:	Thu Sep 25 11:02:41 2003 UTC (20 years, 7 months ago) by dl
Branch:	MAIN
Changes since 1.3:	+52 -15 lines
Log Message:	improve tck javadocs; rename and add a few tests
#	Content
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 java.util.concurrent.atomic.*;
9	import junit.framework.*;
10	import java.util.*;
11
12	public class AtomicIntegerFieldUpdaterTest extends JSR166TestCase {
13	volatile int x = 0;
14	int w;
15	long z;
16	public static void main(String[] args){
17	junit.textui.TestRunner.run(suite());
18	}
19	public static Test suite() {
20	return new TestSuite(AtomicIntegerFieldUpdaterTest.class);
21	}
22
23	/**
24	* Contruction with non-existent field throws RuntimeException
25	*/
26	public void testConstructor() {
27	try{
28	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
29	a = AtomicIntegerFieldUpdater.newUpdater
30	(getClass(), "y");
31	shouldThrow();
32	}
33	catch (RuntimeException rt) {}
34	}
35
36	/**
37	* construction with field not of given type throws RuntimeException
38	*/
39	public void testConstructor2() {
40	try{
41	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
42	a = AtomicIntegerFieldUpdater.newUpdater
43	(getClass(), "z");
44	shouldThrow();
45	}
46	catch (RuntimeException rt) {}
47	}
48
49	/**
50	* construction with non-volatile field throws RuntimeException
51	*/
52	public void testConstructor3() {
53	try{
54	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
55	a = AtomicIntegerFieldUpdater.newUpdater
56	(getClass(), "w");
57	shouldThrow();
58	}
59	catch (RuntimeException rt) {}
60	}
61
62	/**
63	* get returns the last value set or assigned
64	*/
65	public void testGetSet() {
66	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x");
67	x = 1;
68	assertEquals(1,a.get(this));
69	a.set(this,2);
70	assertEquals(2,a.get(this));
71	a.set(this,-3);
72	assertEquals(-3,a.get(this));
73
74	}
75	/**
76	* compareAndSet succeeds in changing value if equal to expected else fails
77	*/
78	public void testCompareAndSet() {
79	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x");
80	x = 1;
81	assertTrue(a.compareAndSet(this,1,2));
82	assertTrue(a.compareAndSet(this,2,-4));
83	assertEquals(-4,a.get(this));
84	assertFalse(a.compareAndSet(this,-5,7));
85	assertFalse((7 == a.get(this)));
86	assertTrue(a.compareAndSet(this,-4,7));
87	assertEquals(7,a.get(this));
88	}
89
90
91	/**
92	* compareAndSet in one thread enables another waiting for value
93	* to succeed
94	*/
95	public void testCompareAndSetInMultipleThreads() {
96	x = 1;
97	final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x");
98
99	Thread t = new Thread(new Runnable() {
100	public void run() {
101	while(!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3)) Thread.yield();
102	}});
103	try {
104	t.start();
105	assertTrue(a.compareAndSet(this, 1, 2));
106	t.join(LONG_DELAY_MS);
107	assertFalse(t.isAlive());
108	assertEquals(a.get(this), 3);
109	}
110	catch(Exception e) {
111	unexpectedException();
112	}
113	}
114
115	/**
116	* repeated weakCompareAndSet succeeds in changing value when equal
117	* to expected
118	*/
119	public void testWeakCompareAndSet() {
120	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x");
121	x = 1;
122	while(!a.weakCompareAndSet(this,1,2));
123	while(!a.weakCompareAndSet(this,2,-4));
124	assertEquals(-4,a.get(this));
125	while(!a.weakCompareAndSet(this,-4,7));
126	assertEquals(7,a.get(this));
127	}
128
129	/**
130	* getAndSet returns previous value and sets to given value
131	*/
132	public void testGetAndSet() {
133	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x");
134	x = 1;
135	assertEquals(1,a.getAndSet(this, 0));
136	assertEquals(0,a.getAndSet(this,-10));
137	assertEquals(-10,a.getAndSet(this,1));
138	}
139
140	/**
141	* getAndAdd returns previous value and adds given value
142	*/
143	public void testGetAndAdd() {
144	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x");
145	x = 1;
146	assertEquals(1,a.getAndAdd(this,2));
147	assertEquals(3,a.get(this));
148	assertEquals(3,a.getAndAdd(this,-4));
149	assertEquals(-1,a.get(this));
150	}
151
152	/**
153	* getAndDecrement returns previous value and decrements
154	*/
155	public void testGetAndDecrement() {
156	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x");
157	x = 1;
158	assertEquals(1,a.getAndDecrement(this));
159	assertEquals(0,a.getAndDecrement(this));
160	assertEquals(-1,a.getAndDecrement(this));
161	}
162
163	/**
164	* getAndIncrement returns previous value and increments
165	*/
166	public void testGetAndIncrement() {
167	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x");
168	x = 1;
169	assertEquals(1,a.getAndIncrement(this));
170	assertEquals(2,a.get(this));
171	a.set(this,-2);
172	assertEquals(-2,a.getAndIncrement(this));
173	assertEquals(-1,a.getAndIncrement(this));
174	assertEquals(0,a.getAndIncrement(this));
175	assertEquals(1,a.get(this));
176	}
177
178	/**
179	* addAndGet adds given value to current, and returns current value
180	*/
181	public void testAddAndGet() {
182	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x");
183	x = 1;
184	assertEquals(3,a.addAndGet(this,2));
185	assertEquals(3,a.get(this));
186	assertEquals(-1,a.addAndGet(this,-4));
187	assertEquals(-1,a.get(this));
188	}
189
190	/**
191	* decrementAndGet decrements and returns current value
192	*/
193	public void testDecrementAndGet() {
194	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x");
195	x = 1;
196	assertEquals(0,a.decrementAndGet(this));
197	assertEquals(-1,a.decrementAndGet(this));
198	assertEquals(-2,a.decrementAndGet(this));
199	assertEquals(-2,a.get(this));
200	}
201
202	/**
203	* incrementAndGet increments and returns current value
204	*/
205	public void testIncrementAndGet() {
206	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = AtomicIntegerFieldUpdater.newUpdater(getClass(), "x");
207	x = 1;
208	assertEquals(2,a.incrementAndGet(this));
209	assertEquals(2,a.get(this));
210	a.set(this,-2);
211	assertEquals(-1,a.incrementAndGet(this));
212	assertEquals(0,a.incrementAndGet(this));
213	assertEquals(1,a.incrementAndGet(this));
214	assertEquals(1,a.get(this));
215	}
216
217	}