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

public class AtomicIntegerArrayTest extends JSR166TestCase {

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


    /**
     * constructor creates array of given size with all elements zero
     */
    public void testConstructor() {
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
        for (int i = 0; i < SIZE; ++i) 
            assertEquals(0,ai.get(i));
    }

    /**
     * constructor with null array throws NPE
     */
    public void testConstructor2NPE() {
        try {
            int[] a = null;
            AtomicIntegerArray ai = new AtomicIntegerArray(a);
        } catch (NullPointerException success) {
        } catch (Exception ex) {
            unexpectedException();
        }
    }

    /**
     * constructor with array is of same size and has all elements
     */
    public void testConstructor2() {
        int[] a = { 17, 3, -42, 99, -7};
        AtomicIntegerArray ai = new AtomicIntegerArray(a);
        assertEquals(a.length, ai.length());
        for (int i = 0; i < a.length; ++i) 
            assertEquals(a[i], ai.get(i));
    }

    /**
     * get and set for out of bound indices throw IndexOutOfBoundsException
     */
    public void testIndexing(){
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
        try {
            ai.get(SIZE);
        } catch(IndexOutOfBoundsException success){
        }
        try {
            ai.get(-1);
        } catch(IndexOutOfBoundsException success){
        }
        try {
            ai.set(SIZE, 0);
        } catch(IndexOutOfBoundsException success){
        }
        try {
            ai.set(-1, 0);
        } catch(IndexOutOfBoundsException success){
        }
    }

    /**
     * get returns the last value set at index
     */
    public void testGetSet() {
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); 
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, 1);
            assertEquals(1,ai.get(i));
            ai.set(i, 2);
            assertEquals(2,ai.get(i));
            ai.set(i, -3);
            assertEquals(-3,ai.get(i));
        }
    }

    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); 
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, 1);
            assertTrue(ai.compareAndSet(i, 1,2));
            assertTrue(ai.compareAndSet(i, 2,-4));
            assertEquals(-4,ai.get(i));
            assertFalse(ai.compareAndSet(i, -5,7));
            assertFalse((7 == ai.get(i)));
            assertTrue(ai.compareAndSet(i, -4,7));
            assertEquals(7,ai.get(i));
        }
    }

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() {
        final AtomicIntegerArray a = new AtomicIntegerArray(1);
        a.set(0, 1);
        Thread t = new Thread(new Runnable() {
                public void run() {
                    while(!a.compareAndSet(0, 2, 3)) Thread.yield();
                }});
        try {
            t.start();
            assertTrue(a.compareAndSet(0, 1, 2));
            t.join(LONG_DELAY_MS);
            assertFalse(t.isAlive());
            assertEquals(a.get(0), 3);
        }
        catch(Exception e) {
            unexpectedException();
        }
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected 
     */
    public void testWeakCompareAndSet() {
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); 
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, 1);
            while(!ai.weakCompareAndSet(i, 1,2));
            while(!ai.weakCompareAndSet(i, 2,-4));
            assertEquals(-4,ai.get(i));
            while(!ai.weakCompareAndSet(i, -4,7));
            assertEquals(7,ai.get(i));
        }
    }

    /**
     *  getAndSet returns previous value and sets to given value at given index
     */
    public void testGetAndSet() {
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); 
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, 1);
            assertEquals(1,ai.getAndSet(i,0));
            assertEquals(0,ai.getAndSet(i,-10));
            assertEquals(-10,ai.getAndSet(i,1));
        }
    }

    /**
     *  getAndAdd returns previous value and adds given value
     */
    public void testGetAndAdd() {
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); 
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, 1);
            assertEquals(1,ai.getAndAdd(i,2));
            assertEquals(3,ai.get(i));
            assertEquals(3,ai.getAndAdd(i,-4));
            assertEquals(-1,ai.get(i));
        }
    }

    /**
     * getAndDecrement returns previous value and decrements
     */
    public void testGetAndDecrement() {
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); 
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, 1);
            assertEquals(1,ai.getAndDecrement(i));
            assertEquals(0,ai.getAndDecrement(i));
            assertEquals(-1,ai.getAndDecrement(i));
        }
    }

    /**
     * getAndIncrement returns previous value and increments
     */
    public void testGetAndIncrement() {
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); 
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, 1);
            assertEquals(1,ai.getAndIncrement(i));
            assertEquals(2,ai.get(i));
            ai.set(i,-2);
            assertEquals(-2,ai.getAndIncrement(i));
            assertEquals(-1,ai.getAndIncrement(i));
            assertEquals(0,ai.getAndIncrement(i));
            assertEquals(1,ai.get(i));
        }
    }

    /**
     *  addAndGet adds given value to current, and returns current value
     */
    public void testAddAndGet() {
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); 
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, 1);
            assertEquals(3,ai.addAndGet(i,2));
            assertEquals(3,ai.get(i));
            assertEquals(-1,ai.addAndGet(i,-4));
            assertEquals(-1,ai.get(i));
        }
    }

    /**
     * decrementAndGet decrements and returns current value
     */
    public void testDecrementAndGet() {
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); 
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, 1);
            assertEquals(0,ai.decrementAndGet(i));
            assertEquals(-1,ai.decrementAndGet(i));
            assertEquals(-2,ai.decrementAndGet(i));
            assertEquals(-2,ai.get(i));
        }
    }

    /**
     *  incrementAndGet increments and returns current value
     */
    public void testIncrementAndGet() {
        AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); 
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, 1);
            assertEquals(2,ai.incrementAndGet(i));
            assertEquals(2,ai.get(i));
            ai.set(i, -2);
            assertEquals(-1,ai.incrementAndGet(i));
            assertEquals(0,ai.incrementAndGet(i));
            assertEquals(1,ai.incrementAndGet(i));
            assertEquals(1,ai.get(i));
        }
    }

    static final int COUNTDOWN = 100000;
    
    class Counter implements Runnable {
        final AtomicIntegerArray ai;
        volatile int counts;
        Counter(AtomicIntegerArray a) { ai = a; }
        public void run() {
            for (;;) {
                boolean done = true;
                for (int i = 0; i < ai.length(); ++i) {
                    int v = ai.get(i);
                    threadAssertTrue(v >= 0);
                    if (v != 0) {
                        done = false;
                        if (ai.compareAndSet(i, v, v-1))
                            ++counts;
                    }
                }
                if (done)
                    break;
            }
        }
    }

    /**
     * Multiple threads using same array of counters successfully
     * update a number of times equal to total count
     */
    public void testCountingInMultipleThreads() {
        try {
            final AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); 
            for (int i = 0; i < SIZE; ++i) 
                ai.set(i, COUNTDOWN);
            Counter c1 = new Counter(ai);
            Counter c2 = new Counter(ai);
            Thread t1 = new Thread(c1);
            Thread t2 = new Thread(c2);
            t1.start();
            t2.start();
            t1.join();
            t2.join();
            assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
        }
        catch(InterruptedException ie) {
            unexpectedException();
        }
    }


    /**
     * a deserialized serialized array holds same values
     */
    public void testSerialization() {
        AtomicIntegerArray l = new AtomicIntegerArray(SIZE); 
        for (int i = 0; i < SIZE; ++i) 
            l.set(i, -i);

        try {
            ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
            ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
            out.writeObject(l);
            out.close();

            ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
            ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
            AtomicIntegerArray r = (AtomicIntegerArray) in.readObject();
            for (int i = 0; i < SIZE; ++i) {
                assertEquals(l.get(i), r.get(i));
            }
        } catch(Exception e){
            e.printStackTrace();
            unexpectedException();
        }
    }


}
Revision:	1.8
Committed:	Fri Jan 9 20:07:36 2004 UTC (20 years, 4 months ago) by dl
Branch:	MAIN
Changes since 1.7:	+2 -0 lines
Log Message:	Tests for toString methods
#	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 junit.framework.*;
10			import java.util.concurrent.atomic.*;
11	dl	1.2	import java.io.*;
12	dl	1.1
13	dl	1.3	public class AtomicIntegerArrayTest extends JSR166TestCase {
14	dl	1.1
15			public static void main (String[] args) {
16			junit.textui.TestRunner.run (suite());
17			}
18			public static Test suite() {
19			return new TestSuite(AtomicIntegerArrayTest.class);
20			}
21
22	dl	1.3
23	dl	1.4	/**
24	dl	1.5	* constructor creates array of given size with all elements zero
25	dl	1.4	*/
26			public void testConstructor() {
27	dl	1.3	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
28			for (int i = 0; i < SIZE; ++i)
29	dl	1.1	assertEquals(0,ai.get(i));
30			}
31
32	dl	1.4	/**
33	dl	1.7	* constructor with null array throws NPE
34			*/
35			public void testConstructor2NPE() {
36			try {
37			int[] a = null;
38			AtomicIntegerArray ai = new AtomicIntegerArray(a);
39			} catch (NullPointerException success) {
40			} catch (Exception ex) {
41			unexpectedException();
42			}
43			}
44
45			/**
46			* constructor with array is of same size and has all elements
47			*/
48			public void testConstructor2() {
49			int[] a = { 17, 3, -42, 99, -7};
50			AtomicIntegerArray ai = new AtomicIntegerArray(a);
51			assertEquals(a.length, ai.length());
52			for (int i = 0; i < a.length; ++i)
53			assertEquals(a[i], ai.get(i));
54			}
55
56			/**
57	dl	1.5	* get and set for out of bound indices throw IndexOutOfBoundsException
58			*/
59			public void testIndexing(){
60			AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
61			try {
62			ai.get(SIZE);
63			} catch(IndexOutOfBoundsException success){
64			}
65			try {
66			ai.get(-1);
67			} catch(IndexOutOfBoundsException success){
68			}
69			try {
70			ai.set(SIZE, 0);
71			} catch(IndexOutOfBoundsException success){
72			}
73			try {
74			ai.set(-1, 0);
75			} catch(IndexOutOfBoundsException success){
76			}
77			}
78
79			/**
80			* get returns the last value set at index
81	dl	1.4	*/
82			public void testGetSet() {
83	dl	1.3	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
84			for (int i = 0; i < SIZE; ++i) {
85	dl	1.1	ai.set(i, 1);
86			assertEquals(1,ai.get(i));
87			ai.set(i, 2);
88			assertEquals(2,ai.get(i));
89			ai.set(i, -3);
90			assertEquals(-3,ai.get(i));
91			}
92			}
93
94	dl	1.4	/**
95	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
96	dl	1.4	*/
97			public void testCompareAndSet() {
98	dl	1.3	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
99			for (int i = 0; i < SIZE; ++i) {
100	dl	1.1	ai.set(i, 1);
101			assertTrue(ai.compareAndSet(i, 1,2));
102			assertTrue(ai.compareAndSet(i, 2,-4));
103			assertEquals(-4,ai.get(i));
104			assertFalse(ai.compareAndSet(i, -5,7));
105			assertFalse((7 == ai.get(i)));
106			assertTrue(ai.compareAndSet(i, -4,7));
107			assertEquals(7,ai.get(i));
108			}
109			}
110
111	dl	1.4	/**
112	dl	1.5	* compareAndSet in one thread enables another waiting for value
113			* to succeed
114			*/
115			public void testCompareAndSetInMultipleThreads() {
116			final AtomicIntegerArray a = new AtomicIntegerArray(1);
117			a.set(0, 1);
118			Thread t = new Thread(new Runnable() {
119			public void run() {
120			while(!a.compareAndSet(0, 2, 3)) Thread.yield();
121			}});
122			try {
123			t.start();
124			assertTrue(a.compareAndSet(0, 1, 2));
125			t.join(LONG_DELAY_MS);
126			assertFalse(t.isAlive());
127			assertEquals(a.get(0), 3);
128			}
129			catch(Exception e) {
130			unexpectedException();
131			}
132			}
133
134			/**
135			* repeated weakCompareAndSet succeeds in changing value when equal
136			* to expected
137	dl	1.4	*/
138			public void testWeakCompareAndSet() {
139	dl	1.3	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
140			for (int i = 0; i < SIZE; ++i) {
141	dl	1.1	ai.set(i, 1);
142			while(!ai.weakCompareAndSet(i, 1,2));
143			while(!ai.weakCompareAndSet(i, 2,-4));
144			assertEquals(-4,ai.get(i));
145			while(!ai.weakCompareAndSet(i, -4,7));
146			assertEquals(7,ai.get(i));
147			}
148			}
149
150	dl	1.4	/**
151	dl	1.5	* getAndSet returns previous value and sets to given value at given index
152	dl	1.4	*/
153			public void testGetAndSet() {
154	dl	1.3	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
155			for (int i = 0; i < SIZE; ++i) {
156	dl	1.1	ai.set(i, 1);
157			assertEquals(1,ai.getAndSet(i,0));
158			assertEquals(0,ai.getAndSet(i,-10));
159			assertEquals(-10,ai.getAndSet(i,1));
160			}
161			}
162
163	dl	1.4	/**
164	dl	1.5	* getAndAdd returns previous value and adds given value
165	dl	1.4	*/
166			public void testGetAndAdd() {
167	dl	1.3	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
168			for (int i = 0; i < SIZE; ++i) {
169	dl	1.1	ai.set(i, 1);
170			assertEquals(1,ai.getAndAdd(i,2));
171			assertEquals(3,ai.get(i));
172			assertEquals(3,ai.getAndAdd(i,-4));
173			assertEquals(-1,ai.get(i));
174			}
175			}
176
177	dl	1.4	/**
178	dl	1.5	* getAndDecrement returns previous value and decrements
179	dl	1.4	*/
180			public void testGetAndDecrement() {
181	dl	1.3	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
182			for (int i = 0; i < SIZE; ++i) {
183	dl	1.1	ai.set(i, 1);
184			assertEquals(1,ai.getAndDecrement(i));
185			assertEquals(0,ai.getAndDecrement(i));
186			assertEquals(-1,ai.getAndDecrement(i));
187			}
188			}
189
190	dl	1.4	/**
191	dl	1.5	* getAndIncrement returns previous value and increments
192	dl	1.4	*/
193			public void testGetAndIncrement() {
194	dl	1.3	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
195			for (int i = 0; i < SIZE; ++i) {
196	dl	1.1	ai.set(i, 1);
197			assertEquals(1,ai.getAndIncrement(i));
198			assertEquals(2,ai.get(i));
199			ai.set(i,-2);
200			assertEquals(-2,ai.getAndIncrement(i));
201			assertEquals(-1,ai.getAndIncrement(i));
202			assertEquals(0,ai.getAndIncrement(i));
203			assertEquals(1,ai.get(i));
204			}
205			}
206
207	dl	1.4	/**
208	dl	1.5	* addAndGet adds given value to current, and returns current value
209	dl	1.4	*/
210	dl	1.1	public void testAddAndGet() {
211	dl	1.3	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
212			for (int i = 0; i < SIZE; ++i) {
213	dl	1.1	ai.set(i, 1);
214			assertEquals(3,ai.addAndGet(i,2));
215			assertEquals(3,ai.get(i));
216			assertEquals(-1,ai.addAndGet(i,-4));
217			assertEquals(-1,ai.get(i));
218			}
219			}
220
221	dl	1.4	/**
222	dl	1.5	* decrementAndGet decrements and returns current value
223	dl	1.4	*/
224			public void testDecrementAndGet() {
225	dl	1.3	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
226			for (int i = 0; i < SIZE; ++i) {
227	dl	1.1	ai.set(i, 1);
228			assertEquals(0,ai.decrementAndGet(i));
229			assertEquals(-1,ai.decrementAndGet(i));
230			assertEquals(-2,ai.decrementAndGet(i));
231			assertEquals(-2,ai.get(i));
232			}
233			}
234
235	dl	1.4	/**
236	dl	1.5	* incrementAndGet increments and returns current value
237	dl	1.4	*/
238	dl	1.1	public void testIncrementAndGet() {
239	dl	1.3	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
240			for (int i = 0; i < SIZE; ++i) {
241	dl	1.1	ai.set(i, 1);
242			assertEquals(2,ai.incrementAndGet(i));
243			assertEquals(2,ai.get(i));
244			ai.set(i, -2);
245			assertEquals(-1,ai.incrementAndGet(i));
246			assertEquals(0,ai.incrementAndGet(i));
247			assertEquals(1,ai.incrementAndGet(i));
248			assertEquals(1,ai.get(i));
249	dl	1.2	}
250			}
251
252	dl	1.3	static final int COUNTDOWN = 100000;
253
254			class Counter implements Runnable {
255			final AtomicIntegerArray ai;
256			volatile int counts;
257			Counter(AtomicIntegerArray a) { ai = a; }
258			public void run() {
259			for (;;) {
260			boolean done = true;
261			for (int i = 0; i < ai.length(); ++i) {
262			int v = ai.get(i);
263			threadAssertTrue(v >= 0);
264			if (v != 0) {
265			done = false;
266			if (ai.compareAndSet(i, v, v-1))
267			++counts;
268			}
269			}
270			if (done)
271			break;
272			}
273			}
274			}
275
276	dl	1.4	/**
277	dl	1.5	* Multiple threads using same array of counters successfully
278			* update a number of times equal to total count
279	dl	1.4	*/
280	dl	1.3	public void testCountingInMultipleThreads() {
281			try {
282			final AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
283			for (int i = 0; i < SIZE; ++i)
284			ai.set(i, COUNTDOWN);
285			Counter c1 = new Counter(ai);
286			Counter c2 = new Counter(ai);
287			Thread t1 = new Thread(c1);
288			Thread t2 = new Thread(c2);
289			t1.start();
290			t2.start();
291			t1.join();
292			t2.join();
293			assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
294			}
295			catch(InterruptedException ie) {
296	dl	1.4	unexpectedException();
297	dl	1.3	}
298			}
299
300
301	dl	1.4	/**
302	dl	1.5	* a deserialized serialized array holds same values
303	dl	1.4	*/
304	dl	1.2	public void testSerialization() {
305	dl	1.3	AtomicIntegerArray l = new AtomicIntegerArray(SIZE);
306			for (int i = 0; i < SIZE; ++i)
307	dl	1.2	l.set(i, -i);
308
309			try {
310			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
311			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
312			out.writeObject(l);
313			out.close();
314
315			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
316			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
317			AtomicIntegerArray r = (AtomicIntegerArray) in.readObject();
318	dl	1.3	for (int i = 0; i < SIZE; ++i) {
319	dl	1.2	assertEquals(l.get(i), r.get(i));
320			}
321			} catch(Exception e){
322			e.printStackTrace();
323	dl	1.4	unexpectedException();
324	dl	1.1	}
325			}
326
327	dl	1.8
328
329	dl	1.1	}