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);
    }

    /**
     * Construction 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;
        try {
            a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        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;
        try {
            a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        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;
        try {
            a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }

        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;
        try {
            a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        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;
        try {
            a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        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;
        try {
            a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        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;
        try {
            a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        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;
        try {
            a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        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;
        try {
            a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        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;
        try {
            a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        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;
        try {
            a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
        } catch (RuntimeException ok) {
            return;
        }
        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:	1.8
Committed:	Tue Jan 20 20:20:56 2004 UTC (20 years, 3 months ago) by dl
Branch:	MAIN
CVS Tags:	JSR166_PFD
Changes since 1.7:	+66 -11 lines
Log Message:	Don't fail if test harness doesn't have sufficient permissions
#	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 AtomicIntegerFieldUpdaterTest extends JSR166TestCase {
14	dl	1.1	volatile int x = 0;
15	dl	1.4	int w;
16	dl	1.2	long z;
17	dl	1.1	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	dl	1.3	/**
25	dl	1.7	* Construction with non-existent field throws RuntimeException
26	dl	1.3	*/
27			public void testConstructor() {
28	dl	1.1	try{
29			AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
30			a = AtomicIntegerFieldUpdater.newUpdater
31	dl	1.5	(AtomicIntegerFieldUpdaterTest.class, "y");
32	dl	1.3	shouldThrow();
33	dl	1.2	}
34			catch (RuntimeException rt) {}
35			}
36
37	dl	1.3	/**
38	dl	1.4	* construction with field not of given type throws RuntimeException
39	dl	1.3	*/
40			public void testConstructor2() {
41	dl	1.2	try{
42			AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
43			a = AtomicIntegerFieldUpdater.newUpdater
44	dl	1.5	(AtomicIntegerFieldUpdaterTest.class, "z");
45	dl	1.3	shouldThrow();
46	dl	1.1	}
47			catch (RuntimeException rt) {}
48			}
49
50	dl	1.3	/**
51	dl	1.4	* construction with non-volatile field throws RuntimeException
52			*/
53			public void testConstructor3() {
54			try{
55			AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>
56			a = AtomicIntegerFieldUpdater.newUpdater
57	dl	1.5	(AtomicIntegerFieldUpdaterTest.class, "w");
58	dl	1.4	shouldThrow();
59			}
60			catch (RuntimeException rt) {}
61			}
62
63			/**
64			* get returns the last value set or assigned
65	dl	1.3	*/
66			public void testGetSet() {
67	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
68			try {
69			a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
70			} catch (RuntimeException ok) {
71			return;
72			}
73	dl	1.1	x = 1;
74			assertEquals(1,a.get(this));
75			a.set(this,2);
76			assertEquals(2,a.get(this));
77			a.set(this,-3);
78			assertEquals(-3,a.get(this));
79
80			}
81	dl	1.3	/**
82	dl	1.4	* compareAndSet succeeds in changing value if equal to expected else fails
83	dl	1.3	*/
84			public void testCompareAndSet() {
85	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
86			try {
87			a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
88			} catch (RuntimeException ok) {
89			return;
90			}
91	dl	1.1	x = 1;
92			assertTrue(a.compareAndSet(this,1,2));
93			assertTrue(a.compareAndSet(this,2,-4));
94			assertEquals(-4,a.get(this));
95			assertFalse(a.compareAndSet(this,-5,7));
96			assertFalse((7 == a.get(this)));
97			assertTrue(a.compareAndSet(this,-4,7));
98			assertEquals(7,a.get(this));
99			}
100
101	dl	1.4
102			/**
103			* compareAndSet in one thread enables another waiting for value
104			* to succeed
105			*/
106			public void testCompareAndSetInMultipleThreads() {
107			x = 1;
108	dl	1.8	final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest>a;
109			try {
110			a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
111			} catch (RuntimeException ok) {
112			return;
113			}
114	dl	1.4
115			Thread t = new Thread(new Runnable() {
116			public void run() {
117			while(!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3)) Thread.yield();
118			}});
119			try {
120			t.start();
121			assertTrue(a.compareAndSet(this, 1, 2));
122			t.join(LONG_DELAY_MS);
123			assertFalse(t.isAlive());
124			assertEquals(a.get(this), 3);
125			}
126			catch(Exception e) {
127			unexpectedException();
128			}
129			}
130
131	dl	1.3	/**
132	dl	1.4	* repeated weakCompareAndSet succeeds in changing value when equal
133			* to expected
134	dl	1.3	*/
135			public void testWeakCompareAndSet() {
136	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
137			try {
138			a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
139			} catch (RuntimeException ok) {
140			return;
141			}
142	dl	1.1	x = 1;
143			while(!a.weakCompareAndSet(this,1,2));
144			while(!a.weakCompareAndSet(this,2,-4));
145			assertEquals(-4,a.get(this));
146			while(!a.weakCompareAndSet(this,-4,7));
147			assertEquals(7,a.get(this));
148			}
149
150	dl	1.3	/**
151	dl	1.4	* getAndSet returns previous value and sets to given value
152	dl	1.3	*/
153			public void testGetAndSet() {
154	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
155			try {
156			a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
157			} catch (RuntimeException ok) {
158			return;
159			}
160	dl	1.1	x = 1;
161			assertEquals(1,a.getAndSet(this, 0));
162			assertEquals(0,a.getAndSet(this,-10));
163			assertEquals(-10,a.getAndSet(this,1));
164			}
165
166	dl	1.3	/**
167	dl	1.4	* getAndAdd returns previous value and adds given value
168	dl	1.3	*/
169			public void testGetAndAdd() {
170	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
171			try {
172			a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
173			} catch (RuntimeException ok) {
174			return;
175			}
176	dl	1.1	x = 1;
177			assertEquals(1,a.getAndAdd(this,2));
178			assertEquals(3,a.get(this));
179			assertEquals(3,a.getAndAdd(this,-4));
180			assertEquals(-1,a.get(this));
181			}
182
183	dl	1.3	/**
184	dl	1.4	* getAndDecrement returns previous value and decrements
185	dl	1.3	*/
186			public void testGetAndDecrement() {
187	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
188			try {
189			a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
190			} catch (RuntimeException ok) {
191			return;
192			}
193	dl	1.1	x = 1;
194			assertEquals(1,a.getAndDecrement(this));
195			assertEquals(0,a.getAndDecrement(this));
196			assertEquals(-1,a.getAndDecrement(this));
197			}
198
199	dl	1.3	/**
200	dl	1.4	* getAndIncrement returns previous value and increments
201	dl	1.3	*/
202			public void testGetAndIncrement() {
203	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
204			try {
205			a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
206			} catch (RuntimeException ok) {
207			return;
208			}
209	dl	1.1	x = 1;
210			assertEquals(1,a.getAndIncrement(this));
211			assertEquals(2,a.get(this));
212			a.set(this,-2);
213			assertEquals(-2,a.getAndIncrement(this));
214			assertEquals(-1,a.getAndIncrement(this));
215			assertEquals(0,a.getAndIncrement(this));
216			assertEquals(1,a.get(this));
217			}
218
219	dl	1.3	/**
220	dl	1.4	* addAndGet adds given value to current, and returns current value
221	dl	1.3	*/
222			public void testAddAndGet() {
223	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
224			try {
225			a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
226			} catch (RuntimeException ok) {
227			return;
228			}
229	dl	1.1	x = 1;
230			assertEquals(3,a.addAndGet(this,2));
231			assertEquals(3,a.get(this));
232			assertEquals(-1,a.addAndGet(this,-4));
233			assertEquals(-1,a.get(this));
234			}
235
236	dl	1.3	/**
237	dl	1.4	* decrementAndGet decrements and returns current value
238	dl	1.3	*/
239			public void testDecrementAndGet() {
240	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
241			try {
242			a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
243			} catch (RuntimeException ok) {
244			return;
245			}
246	dl	1.1	x = 1;
247			assertEquals(0,a.decrementAndGet(this));
248			assertEquals(-1,a.decrementAndGet(this));
249			assertEquals(-2,a.decrementAndGet(this));
250			assertEquals(-2,a.get(this));
251			}
252
253	dl	1.3	/**
254	dl	1.4	* incrementAndGet increments and returns current value
255	dl	1.3	*/
256			public void testIncrementAndGet() {
257	dl	1.8	AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a;
258			try {
259			a = AtomicIntegerFieldUpdater.newUpdater(AtomicIntegerFieldUpdaterTest.class, "x");
260			} catch (RuntimeException ok) {
261			return;
262			}
263	dl	1.1	x = 1;
264			assertEquals(2,a.incrementAndGet(this));
265			assertEquals(2,a.get(this));
266			a.set(this,-2);
267			assertEquals(-1,a.incrementAndGet(this));
268			assertEquals(0,a.incrementAndGet(this));
269			assertEquals(1,a.incrementAndGet(this));
270			assertEquals(1,a.get(this));
271			}
272
273			}