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root/jsr166/jsr166/src/test/tck/AtomicIntegerArrayTest.java

Comparing jsr166/src/test/tck/AtomicIntegerArrayTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:52 2003 UTC vs.
Revision 1.21 by jsr166, Fri May 27 19:39:07 2011 UTC

#	Line 1 | Line 1
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.
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/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9		import junit.framework.*;
10		import java.util.concurrent.atomic.*;
11	+	import java.io.*;
12	+	import java.util.*;
13
14	<	public class AtomicIntegerArrayTest extends TestCase
12	<	{
13	<	static final int N = 10;
14	>	public class AtomicIntegerArrayTest extends JSR166TestCase {
15
16	<	public static void main (String[] args) {
17	<	junit.textui.TestRunner.run (suite());
16	>	public static void main(String[] args) {
17	>	junit.textui.TestRunner.run(suite());
18		}
19		public static Test suite() {
20		return new TestSuite(AtomicIntegerArrayTest.class);
21		}
22
23	<	public void testConstructor(){
24	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
25	<	for (int i = 0; i < N; ++i)
23	>	/**
24	>	* constructor creates array of given size with all elements zero
25	>	*/
26	>	public void testConstructor() {
27	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
28	>	for (int i = 0; i < SIZE; ++i)
29		assertEquals(0,ai.get(i));
30		}
31
32	<	public void testGetSet(){
33	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
34	<	for (int i = 0; i < N; ++i) {
32	>	/**
33	>	* constructor with null array throws NPE
34	>	*/
35	>	public void testConstructor2NPE() {
36	>	try {
37	>	int[] a = null;
38	>	AtomicIntegerArray ai = new AtomicIntegerArray(a);
39	>	shouldThrow();
40	>	} catch (NullPointerException success) {}
41	>	}
42	>
43	>	/**
44	>	* constructor with array is of same size and has all elements
45	>	*/
46	>	public void testConstructor2() {
47	>	int[] a = { 17, 3, -42, 99, -7};
48	>	AtomicIntegerArray ai = new AtomicIntegerArray(a);
49	>	assertEquals(a.length, ai.length());
50	>	for (int i = 0; i < a.length; ++i)
51	>	assertEquals(a[i], ai.get(i));
52	>	}
53	>
54	>	/**
55	>	* get and set for out of bound indices throw IndexOutOfBoundsException
56	>	*/
57	>	public void testIndexing() {
58	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
59	>	try {
60	>	ai.get(SIZE);
61	>	shouldThrow();
62	>	} catch (IndexOutOfBoundsException success) {
63	>	}
64	>	try {
65	>	ai.get(-1);
66	>	shouldThrow();
67	>	} catch (IndexOutOfBoundsException success) {
68	>	}
69	>	try {
70	>	ai.set(SIZE, 0);
71	>	shouldThrow();
72	>	} catch (IndexOutOfBoundsException success) {
73	>	}
74	>	try {
75	>	ai.set(-1, 0);
76	>	shouldThrow();
77	>	} catch (IndexOutOfBoundsException success) {
78	>	}
79	>	}
80	>
81	>	/**
82	>	* get returns the last value set at index
83	>	*/
84	>	public void testGetSet() {
85	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
86	>	for (int i = 0; i < SIZE; ++i) {
87		ai.set(i, 1);
88		assertEquals(1,ai.get(i));
89		ai.set(i, 2);
#	Line 37 | Line 93 | public class AtomicIntegerArrayTest exte
93		}
94		}
95
96	<	public void testCompareAndSet(){
97	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
98	<	for (int i = 0; i < N; ++i) {
96	>	/**
97	>	* get returns the last value lazySet at index by same thread
98	>	*/
99	>	public void testGetLazySet() {
100	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
101	>	for (int i = 0; i < SIZE; ++i) {
102	>	ai.lazySet(i, 1);
103	>	assertEquals(1,ai.get(i));
104	>	ai.lazySet(i, 2);
105	>	assertEquals(2,ai.get(i));
106	>	ai.lazySet(i, -3);
107	>	assertEquals(-3,ai.get(i));
108	>	}
109	>	}
110	>
111	>	/**
112	>	* compareAndSet succeeds in changing value if equal to expected else fails
113	>	*/
114	>	public void testCompareAndSet() {
115	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
116	>	for (int i = 0; i < SIZE; ++i) {
117		ai.set(i, 1);
118		assertTrue(ai.compareAndSet(i, 1,2));
119		assertTrue(ai.compareAndSet(i, 2,-4));
120		assertEquals(-4,ai.get(i));
121		assertFalse(ai.compareAndSet(i, -5,7));
122	<	assertFalse((7 == ai.get(i)));
122	>	assertEquals(-4,ai.get(i));
123		assertTrue(ai.compareAndSet(i, -4,7));
124		assertEquals(7,ai.get(i));
125		}
126		}
127
128	<	public void testWeakCompareAndSet(){
129	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
130	<	for (int i = 0; i < N; ++i) {
128	>	/**
129	>	* compareAndSet in one thread enables another waiting for value
130	>	* to succeed
131	>	*/
132	>	public void testCompareAndSetInMultipleThreads() throws Exception {
133	>	final AtomicIntegerArray a = new AtomicIntegerArray(1);
134	>	a.set(0, 1);
135	>	Thread t = new Thread(new CheckedRunnable() {
136	>	public void realRun() {
137	>	while (!a.compareAndSet(0, 2, 3))
138	>	Thread.yield();
139	>	}});
140	>
141	>	t.start();
142	>	assertTrue(a.compareAndSet(0, 1, 2));
143	>	t.join(LONG_DELAY_MS);
144	>	assertFalse(t.isAlive());
145	>	assertEquals(a.get(0), 3);
146	>	}
147	>
148	>	/**
149	>	* repeated weakCompareAndSet succeeds in changing value when equal
150	>	* to expected
151	>	*/
152	>	public void testWeakCompareAndSet() {
153	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
154	>	for (int i = 0; i < SIZE; ++i) {
155		ai.set(i, 1);
156	<	while(!ai.weakCompareAndSet(i, 1,2));
157	<	while(!ai.weakCompareAndSet(i, 2,-4));
156	>	while (!ai.weakCompareAndSet(i, 1,2));
157	>	while (!ai.weakCompareAndSet(i, 2,-4));
158		assertEquals(-4,ai.get(i));
159	<	while(!ai.weakCompareAndSet(i, -4,7));
159	>	while (!ai.weakCompareAndSet(i, -4,7));
160		assertEquals(7,ai.get(i));
161		}
162		}
163
164	<	public void testGetAndSet(){
165	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
166	<	for (int i = 0; i < N; ++i) {
164	>	/**
165	>	* getAndSet returns previous value and sets to given value at given index
166	>	*/
167	>	public void testGetAndSet() {
168	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
169	>	for (int i = 0; i < SIZE; ++i) {
170		ai.set(i, 1);
171		assertEquals(1,ai.getAndSet(i,0));
172		assertEquals(0,ai.getAndSet(i,-10));
#	Line 73 | Line 174 | public class AtomicIntegerArrayTest exte
174		}
175		}
176
177	<	public void testGetAndAdd(){
178	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
179	<	for (int i = 0; i < N; ++i) {
177	>	/**
178	>	* getAndAdd returns previous value and adds given value
179	>	*/
180	>	public void testGetAndAdd() {
181	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
182	>	for (int i = 0; i < SIZE; ++i) {
183		ai.set(i, 1);
184		assertEquals(1,ai.getAndAdd(i,2));
185		assertEquals(3,ai.get(i));
#	Line 84 | Line 188 | public class AtomicIntegerArrayTest exte
188		}
189		}
190
191	<	public void testGetAndDecrement(){
192	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
193	<	for (int i = 0; i < N; ++i) {
191	>	/**
192	>	* getAndDecrement returns previous value and decrements
193	>	*/
194	>	public void testGetAndDecrement() {
195	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
196	>	for (int i = 0; i < SIZE; ++i) {
197		ai.set(i, 1);
198		assertEquals(1,ai.getAndDecrement(i));
199		assertEquals(0,ai.getAndDecrement(i));
#	Line 94 | Line 201 | public class AtomicIntegerArrayTest exte
201		}
202		}
203
204	<	public void testGetAndIncrement(){
205	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
206	<	for (int i = 0; i < N; ++i) {
204	>	/**
205	>	* getAndIncrement returns previous value and increments
206	>	*/
207	>	public void testGetAndIncrement() {
208	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
209	>	for (int i = 0; i < SIZE; ++i) {
210		ai.set(i, 1);
211		assertEquals(1,ai.getAndIncrement(i));
212		assertEquals(2,ai.get(i));
#	Line 108 | Line 218 | public class AtomicIntegerArrayTest exte
218		}
219		}
220
221	+	/**
222	+	* addAndGet adds given value to current, and returns current value
223	+	*/
224		public void testAddAndGet() {
225	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
226	<	for (int i = 0; i < N; ++i) {
225	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
226	>	for (int i = 0; i < SIZE; ++i) {
227		ai.set(i, 1);
228		assertEquals(3,ai.addAndGet(i,2));
229		assertEquals(3,ai.get(i));
#	Line 119 | Line 232 | public class AtomicIntegerArrayTest exte
232		}
233		}
234
235	<	public void testDecrementAndGet(){
236	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
237	<	for (int i = 0; i < N; ++i) {
235	>	/**
236	>	* decrementAndGet decrements and returns current value
237	>	*/
238	>	public void testDecrementAndGet() {
239	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
240	>	for (int i = 0; i < SIZE; ++i) {
241		ai.set(i, 1);
242		assertEquals(0,ai.decrementAndGet(i));
243		assertEquals(-1,ai.decrementAndGet(i));
#	Line 130 | Line 246 | public class AtomicIntegerArrayTest exte
246		}
247		}
248
249	+	/**
250	+	* incrementAndGet increments and returns current value
251	+	*/
252		public void testIncrementAndGet() {
253	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
254	<	for (int i = 0; i < N; ++i) {
253	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
254	>	for (int i = 0; i < SIZE; ++i) {
255		ai.set(i, 1);
256		assertEquals(2,ai.incrementAndGet(i));
257		assertEquals(2,ai.get(i));
#	Line 144 | Line 263 | public class AtomicIntegerArrayTest exte
263		}
264		}
265
266	+	static final int COUNTDOWN = 100000;
267	+
268	+	class Counter extends CheckedRunnable {
269	+	final AtomicIntegerArray ai;
270	+	volatile int counts;
271	+	Counter(AtomicIntegerArray a) { ai = a; }
272	+	public void realRun() {
273	+	for (;;) {
274	+	boolean done = true;
275	+	for (int i = 0; i < ai.length(); ++i) {
276	+	int v = ai.get(i);
277	+	assertTrue(v >= 0);
278	+	if (v != 0) {
279	+	done = false;
280	+	if (ai.compareAndSet(i, v, v-1))
281	+	++counts;
282	+	}
283	+	}
284	+	if (done)
285	+	break;
286	+	}
287	+	}
288	+	}
289	+
290	+	/**
291	+	* Multiple threads using same array of counters successfully
292	+	* update a number of times equal to total count
293	+	*/
294	+	public void testCountingInMultipleThreads() throws InterruptedException {
295	+	final AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
296	+	for (int i = 0; i < SIZE; ++i)
297	+	ai.set(i, COUNTDOWN);
298	+	Counter c1 = new Counter(ai);
299	+	Counter c2 = new Counter(ai);
300	+	Thread t1 = new Thread(c1);
301	+	Thread t2 = new Thread(c2);
302	+	t1.start();
303	+	t2.start();
304	+	t1.join();
305	+	t2.join();
306	+	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
307	+	}
308	+
309	+	/**
310	+	* a deserialized serialized array holds same values
311	+	*/
312	+	public void testSerialization() throws Exception {
313	+	AtomicIntegerArray l = new AtomicIntegerArray(SIZE);
314	+	for (int i = 0; i < SIZE; ++i)
315	+	l.set(i, -i);
316	+
317	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
318	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
319	+	out.writeObject(l);
320	+	out.close();
321	+
322	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
323	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
324	+	AtomicIntegerArray r = (AtomicIntegerArray) in.readObject();
325	+	for (int i = 0; i < SIZE; ++i) {
326	+	assertEquals(l.get(i), r.get(i));
327	+	}
328	+	}
329	+
330	+	/**
331	+	* toString returns current value.
332	+	*/
333	+	public void testToString() {
334	+	int[] a = { 17, 3, -42, 99, -7};
335	+	AtomicIntegerArray ai = new AtomicIntegerArray(a);
336	+	assertEquals(Arrays.toString(a), ai.toString());
337	+	}
338	+
339		}

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