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

Comparing jsr166/src/test/tck/AtomicIntegerArrayTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 2003 UTC vs.
Revision 1.28 by jsr166, Tue Sep 24 18:50:44 2013 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.*;
10	>	import java.util.Arrays;
11	>	import java.util.concurrent.atomic.AtomicIntegerArray;
12
13	<	public class AtomicIntegerArrayTest extends TestCase
13	<	{
14	<	static final int N = 10;
13	>	public class AtomicIntegerArrayTest extends JSR166TestCase {
14
15	<	public static void main (String[] args) {
16	<	junit.textui.TestRunner.run (suite());
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	<	public void testConstructor(){
23	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
24	<	for (int i = 0; i < N; ++i)
25	<	assertEquals(0,ai.get(i));
26	<	}
27	<
28	<	public void testGetSet(){
30	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
31	<	for (int i = 0; i < N; ++i) {
32	<	ai.set(i, 1);
33	<	assertEquals(1,ai.get(i));
34	<	ai.set(i, 2);
35	<	assertEquals(2,ai.get(i));
36	<	ai.set(i, -3);
37	<	assertEquals(-3,ai.get(i));
38	<	}
39	<	}
40	<
41	<	public void testCompareAndSet(){
42	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
43	<	for (int i = 0; i < N; ++i) {
44	<	ai.set(i, 1);
45	<	assertTrue(ai.compareAndSet(i, 1,2));
46	<	assertTrue(ai.compareAndSet(i, 2,-4));
47	<	assertEquals(-4,ai.get(i));
48	<	assertFalse(ai.compareAndSet(i, -5,7));
49	<	assertFalse((7 == ai.get(i)));
50	<	assertTrue(ai.compareAndSet(i, -4,7));
51	<	assertEquals(7,ai.get(i));
52	<	}
53	<	}
54	<
55	<	public void testWeakCompareAndSet(){
56	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
57	<	for (int i = 0; i < N; ++i) {
58	<	ai.set(i, 1);
59	<	while(!ai.weakCompareAndSet(i, 1,2));
60	<	while(!ai.weakCompareAndSet(i, 2,-4));
61	<	assertEquals(-4,ai.get(i));
62	<	while(!ai.weakCompareAndSet(i, -4,7));
63	<	assertEquals(7,ai.get(i));
64	<	}
65	<	}
66	<
67	<	public void testGetAndSet(){
68	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
69	<	for (int i = 0; i < N; ++i) {
70	<	ai.set(i, 1);
71	<	assertEquals(1,ai.getAndSet(i,0));
72	<	assertEquals(0,ai.getAndSet(i,-10));
73	<	assertEquals(-10,ai.getAndSet(i,1));
74	<	}
75	<	}
76	<
77	<	public void testGetAndAdd(){
78	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
79	<	for (int i = 0; i < N; ++i) {
80	<	ai.set(i, 1);
81	<	assertEquals(1,ai.getAndAdd(i,2));
82	<	assertEquals(3,ai.get(i));
83	<	assertEquals(3,ai.getAndAdd(i,-4));
84	<	assertEquals(-1,ai.get(i));
85	<	}
86	<	}
87	<
88	<	public void testGetAndDecrement(){
89	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
90	<	for (int i = 0; i < N; ++i) {
91	<	ai.set(i, 1);
92	<	assertEquals(1,ai.getAndDecrement(i));
93	<	assertEquals(0,ai.getAndDecrement(i));
94	<	assertEquals(-1,ai.getAndDecrement(i));
95	<	}
96	<	}
97	<
98	<	public void testGetAndIncrement(){
99	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
100	<	for (int i = 0; i < N; ++i) {
101	<	ai.set(i, 1);
102	<	assertEquals(1,ai.getAndIncrement(i));
103	<	assertEquals(2,ai.get(i));
104	<	ai.set(i,-2);
105	<	assertEquals(-2,ai.getAndIncrement(i));
106	<	assertEquals(-1,ai.getAndIncrement(i));
107	<	assertEquals(0,ai.getAndIncrement(i));
108	<	assertEquals(1,ai.get(i));
109	<	}
22	>	/**
23	>	* constructor creates array of given size with all elements zero
24	>	*/
25	>	public void testConstructor() {
26	>	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
27	>	for (int i = 0; i < SIZE; i++)
28	>	assertEquals(0, aa.get(i));
29		}
30
31	+	/**
32	+	* constructor with null array throws NPE
33	+	*/
34	+	public void testConstructor2NPE() {
35	+	try {
36	+	int[] a = null;
37	+	AtomicIntegerArray aa = new AtomicIntegerArray(a);
38	+	shouldThrow();
39	+	} catch (NullPointerException success) {}
40	+	}
41	+
42	+	/**
43	+	* constructor with array is of same size and has all elements
44	+	*/
45	+	public void testConstructor2() {
46	+	int[] a = { 17, 3, -42, 99, -7 };
47	+	AtomicIntegerArray aa = new AtomicIntegerArray(a);
48	+	assertEquals(a.length, aa.length());
49	+	for (int i = 0; i < a.length; i++)
50	+	assertEquals(a[i], aa.get(i));
51	+	}
52	+
53	+	/**
54	+	* get and set for out of bound indices throw IndexOutOfBoundsException
55	+	*/
56	+	public void testIndexing() {
57	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
58	+	for (int index : new int[] { -1, SIZE }) {
59	+	try {
60	+	aa.get(index);
61	+	shouldThrow();
62	+	} catch (IndexOutOfBoundsException success) {}
63	+	try {
64	+	aa.set(index, 1);
65	+	shouldThrow();
66	+	} catch (IndexOutOfBoundsException success) {}
67	+	try {
68	+	aa.lazySet(index, 1);
69	+	shouldThrow();
70	+	} catch (IndexOutOfBoundsException success) {}
71	+	try {
72	+	aa.compareAndSet(index, 1, 2);
73	+	shouldThrow();
74	+	} catch (IndexOutOfBoundsException success) {}
75	+	try {
76	+	aa.weakCompareAndSet(index, 1, 2);
77	+	shouldThrow();
78	+	} catch (IndexOutOfBoundsException success) {}
79	+	try {
80	+	aa.getAndAdd(index, 1);
81	+	shouldThrow();
82	+	} catch (IndexOutOfBoundsException success) {}
83	+	try {
84	+	aa.addAndGet(index, 1);
85	+	shouldThrow();
86	+	} catch (IndexOutOfBoundsException success) {}
87	+	}
88	+	}
89	+
90	+	/**
91	+	* get returns the last value set at index
92	+	*/
93	+	public void testGetSet() {
94	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
95	+	for (int i = 0; i < SIZE; i++) {
96	+	aa.set(i, 1);
97	+	assertEquals(1, aa.get(i));
98	+	aa.set(i, 2);
99	+	assertEquals(2, aa.get(i));
100	+	aa.set(i, -3);
101	+	assertEquals(-3, aa.get(i));
102	+	}
103	+	}
104	+
105	+	/**
106	+	* get returns the last value lazySet at index by same thread
107	+	*/
108	+	public void testGetLazySet() {
109	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
110	+	for (int i = 0; i < SIZE; i++) {
111	+	aa.lazySet(i, 1);
112	+	assertEquals(1, aa.get(i));
113	+	aa.lazySet(i, 2);
114	+	assertEquals(2, aa.get(i));
115	+	aa.lazySet(i, -3);
116	+	assertEquals(-3, aa.get(i));
117	+	}
118	+	}
119	+
120	+	/**
121	+	* compareAndSet succeeds in changing value if equal to expected else fails
122	+	*/
123	+	public void testCompareAndSet() {
124	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
125	+	for (int i = 0; i < SIZE; i++) {
126	+	aa.set(i, 1);
127	+	assertTrue(aa.compareAndSet(i, 1, 2));
128	+	assertTrue(aa.compareAndSet(i, 2, -4));
129	+	assertEquals(-4, aa.get(i));
130	+	assertFalse(aa.compareAndSet(i, -5, 7));
131	+	assertEquals(-4, aa.get(i));
132	+	assertTrue(aa.compareAndSet(i, -4, 7));
133	+	assertEquals(7, aa.get(i));
134	+	}
135	+	}
136	+
137	+	/**
138	+	* compareAndSet in one thread enables another waiting for value
139	+	* to succeed
140	+	*/
141	+	public void testCompareAndSetInMultipleThreads() throws Exception {
142	+	final AtomicIntegerArray a = new AtomicIntegerArray(1);
143	+	a.set(0, 1);
144	+	Thread t = new Thread(new CheckedRunnable() {
145	+	public void realRun() {
146	+	while (!a.compareAndSet(0, 2, 3))
147	+	Thread.yield();
148	+	}});
149	+
150	+	t.start();
151	+	assertTrue(a.compareAndSet(0, 1, 2));
152	+	t.join(LONG_DELAY_MS);
153	+	assertFalse(t.isAlive());
154	+	assertEquals(3, a.get(0));
155	+	}
156	+
157	+	/**
158	+	* repeated weakCompareAndSet succeeds in changing value when equal
159	+	* to expected
160	+	*/
161	+	public void testWeakCompareAndSet() {
162	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
163	+	for (int i = 0; i < SIZE; i++) {
164	+	aa.set(i, 1);
165	+	while (!aa.weakCompareAndSet(i, 1, 2));
166	+	while (!aa.weakCompareAndSet(i, 2, -4));
167	+	assertEquals(-4, aa.get(i));
168	+	while (!aa.weakCompareAndSet(i, -4, 7));
169	+	assertEquals(7, aa.get(i));
170	+	}
171	+	}
172	+
173	+	/**
174	+	* getAndSet returns previous value and sets to given value at given index
175	+	*/
176	+	public void testGetAndSet() {
177	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
178	+	for (int i = 0; i < SIZE; i++) {
179	+	aa.set(i, 1);
180	+	assertEquals(1, aa.getAndSet(i, 0));
181	+	assertEquals(0, aa.getAndSet(i, -10));
182	+	assertEquals(-10, aa.getAndSet(i, 1));
183	+	}
184	+	}
185	+
186	+	/**
187	+	* getAndAdd returns previous value and adds given value
188	+	*/
189	+	public void testGetAndAdd() {
190	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
191	+	for (int i = 0; i < SIZE; i++) {
192	+	aa.set(i, 1);
193	+	assertEquals(1, aa.getAndAdd(i, 2));
194	+	assertEquals(3, aa.get(i));
195	+	assertEquals(3, aa.getAndAdd(i, -4));
196	+	assertEquals(-1, aa.get(i));
197	+	}
198	+	}
199	+
200	+	/**
201	+	* getAndDecrement returns previous value and decrements
202	+	*/
203	+	public void testGetAndDecrement() {
204	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
205	+	for (int i = 0; i < SIZE; i++) {
206	+	aa.set(i, 1);
207	+	assertEquals(1, aa.getAndDecrement(i));
208	+	assertEquals(0, aa.getAndDecrement(i));
209	+	assertEquals(-1, aa.getAndDecrement(i));
210	+	}
211	+	}
212	+
213	+	/**
214	+	* getAndIncrement returns previous value and increments
215	+	*/
216	+	public void testGetAndIncrement() {
217	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
218	+	for (int i = 0; i < SIZE; i++) {
219	+	aa.set(i, 1);
220	+	assertEquals(1, aa.getAndIncrement(i));
221	+	assertEquals(2, aa.get(i));
222	+	aa.set(i, -2);
223	+	assertEquals(-2, aa.getAndIncrement(i));
224	+	assertEquals(-1, aa.getAndIncrement(i));
225	+	assertEquals(0, aa.getAndIncrement(i));
226	+	assertEquals(1, aa.get(i));
227	+	}
228	+	}
229	+
230	+	/**
231	+	* addAndGet adds given value to current, and returns current value
232	+	*/
233		public void testAddAndGet() {
234	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
235	<	for (int i = 0; i < N; ++i) {
236	<	ai.set(i, 1);
237	<	assertEquals(3,ai.addAndGet(i,2));
238	<	assertEquals(3,ai.get(i));
239	<	assertEquals(-1,ai.addAndGet(i,-4));
240	<	assertEquals(-1,ai.get(i));
234	>	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
235	>	for (int i = 0; i < SIZE; i++) {
236	>	aa.set(i, 1);
237	>	assertEquals(3, aa.addAndGet(i, 2));
238	>	assertEquals(3, aa.get(i));
239	>	assertEquals(-1, aa.addAndGet(i, -4));
240	>	assertEquals(-1, aa.get(i));
241		}
242		}
243
244	<	public void testDecrementAndGet(){
245	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
246	<	for (int i = 0; i < N; ++i) {
247	<	ai.set(i, 1);
248	<	assertEquals(0,ai.decrementAndGet(i));
249	<	assertEquals(-1,ai.decrementAndGet(i));
250	<	assertEquals(-2,ai.decrementAndGet(i));
251	<	assertEquals(-2,ai.get(i));
244	>	/**
245	>	* decrementAndGet decrements and returns current value
246	>	*/
247	>	public void testDecrementAndGet() {
248	>	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
249	>	for (int i = 0; i < SIZE; i++) {
250	>	aa.set(i, 1);
251	>	assertEquals(0, aa.decrementAndGet(i));
252	>	assertEquals(-1, aa.decrementAndGet(i));
253	>	assertEquals(-2, aa.decrementAndGet(i));
254	>	assertEquals(-2, aa.get(i));
255		}
256		}
257
258	+	/**
259	+	* incrementAndGet increments and returns current value
260	+	*/
261		public void testIncrementAndGet() {
262	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
263	<	for (int i = 0; i < N; ++i) {
264	<	ai.set(i, 1);
265	<	assertEquals(2,ai.incrementAndGet(i));
266	<	assertEquals(2,ai.get(i));
267	<	ai.set(i, -2);
268	<	assertEquals(-1,ai.incrementAndGet(i));
269	<	assertEquals(0,ai.incrementAndGet(i));
270	<	assertEquals(1,ai.incrementAndGet(i));
271	<	assertEquals(1,ai.get(i));
262	>	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
263	>	for (int i = 0; i < SIZE; i++) {
264	>	aa.set(i, 1);
265	>	assertEquals(2, aa.incrementAndGet(i));
266	>	assertEquals(2, aa.get(i));
267	>	aa.set(i, -2);
268	>	assertEquals(-1, aa.incrementAndGet(i));
269	>	assertEquals(0, aa.incrementAndGet(i));
270	>	assertEquals(1, aa.incrementAndGet(i));
271	>	assertEquals(1, aa.get(i));
272		}
273		}
274
275	<	public void testSerialization() {
276	<	AtomicIntegerArray l = new AtomicIntegerArray(N);
277	<	for (int i = 0; i < N; ++i)
278	<	l.set(i, -i);
279	<
280	<	try {
281	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
282	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
283	<	out.writeObject(l);
284	<	out.close();
285	<
286	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
287	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
288	<	AtomicIntegerArray r = (AtomicIntegerArray) in.readObject();
289	<	for (int i = 0; i < N; ++i) {
290	<	assertEquals(l.get(i), r.get(i));
275	>	class Counter extends CheckedRunnable {
276	>	final AtomicIntegerArray aa;
277	>	volatile int counts;
278	>	Counter(AtomicIntegerArray a) { aa = a; }
279	>	public void realRun() {
280	>	for (;;) {
281	>	boolean done = true;
282	>	for (int i = 0; i < aa.length(); i++) {
283	>	int v = aa.get(i);
284	>	assertTrue(v >= 0);
285	>	if (v != 0) {
286	>	done = false;
287	>	if (aa.compareAndSet(i, v, v-1))
288	>	++counts;
289	>	}
290	>	}
291	>	if (done)
292	>	break;
293		}
165	–	} catch(Exception e){
166	–	e.printStackTrace();
167	–	fail("unexpected exception");
294		}
295		}
296
297	+	/**
298	+	* Multiple threads using same array of counters successfully
299	+	* update a number of times equal to total count
300	+	*/
301	+	public void testCountingInMultipleThreads() throws InterruptedException {
302	+	final AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
303	+	int countdown = 10000;
304	+	for (int i = 0; i < SIZE; i++)
305	+	aa.set(i, countdown);
306	+	Counter c1 = new Counter(aa);
307	+	Counter c2 = new Counter(aa);
308	+	Thread t1 = new Thread(c1);
309	+	Thread t2 = new Thread(c2);
310	+	t1.start();
311	+	t2.start();
312	+	t1.join();
313	+	t2.join();
314	+	assertEquals(c1.counts+c2.counts, SIZE * countdown);
315	+	}
316	+
317	+	/**
318	+	* a deserialized serialized array holds same values
319	+	*/
320	+	public void testSerialization() throws Exception {
321	+	AtomicIntegerArray x = new AtomicIntegerArray(SIZE);
322	+	for (int i = 0; i < SIZE; i++)
323	+	x.set(i, -i);
324	+	AtomicIntegerArray y = serialClone(x);
325	+	assertNotSame(x, y);
326	+	assertEquals(x.length(), y.length());
327	+	for (int i = 0; i < SIZE; i++) {
328	+	assertEquals(x.get(i), y.get(i));
329	+	}
330	+	}
331	+
332	+	/**
333	+	* toString returns current value.
334	+	*/
335	+	public void testToString() {
336	+	int[] a = { 17, 3, -42, 99, -7 };
337	+	AtomicIntegerArray aa = new AtomicIntegerArray(a);
338	+	assertEquals(Arrays.toString(a), aa.toString());
339	+	}
340	+
341		}

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