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Comparing jsr166/src/test/tck/AtomicIntegerArrayTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 2003 UTC vs.
Revision 1.39 by dl, Tue Jan 26 13:33:05 2021 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.*;
10	<	import java.io.*;
11	<
12	<	public class AtomicIntegerArrayTest extends TestCase
13	<	{
14	<	static final int N = 10;
9	>	import java.util.Arrays;
10	>	import java.util.concurrent.atomic.AtomicIntegerArray;
11
12	<	public static void main (String[] args) {
13	<	junit.textui.TestRunner.run (suite());
12	>	import junit.framework.Test;
13	>	import junit.framework.TestSuite;
14	>
15	>	public class AtomicIntegerArrayTest extends JSR166TestCase {
16	>
17	>	public static void main(String[] args) {
18	>	main(suite(), args);
19		}
20		public static Test suite() {
21		return new TestSuite(AtomicIntegerArrayTest.class);
22		}
23
24	<	public void testConstructor(){
25	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
26	<	for (int i = 0; i < N; ++i)
27	<	assertEquals(0,ai.get(i));
28	<	}
29	<
30	<	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	<	}
24	>	/**
25	>	* constructor creates array of given size with all elements zero
26	>	*/
27	>	public void testConstructor() {
28	>	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
29	>	for (int i = 0; i < SIZE; i++)
30	>	assertEquals(0, aa.get(i));
31		}
32
33	+	/**
34	+	* constructor with null array throws NPE
35	+	*/
36	+	public void testConstructor2NPE() {
37	+	try {
38	+	int[] a = null;
39	+	new AtomicIntegerArray(a);
40	+	shouldThrow();
41	+	} catch (NullPointerException success) {}
42	+	}
43	+
44	+	/**
45	+	* constructor with array is of same size and has all elements
46	+	*/
47	+	public void testConstructor2() {
48	+	int[] a = { 17, 3, -42, 99, -7 };
49	+	AtomicIntegerArray aa = new AtomicIntegerArray(a);
50	+	assertEquals(a.length, aa.length());
51	+	for (int i = 0; i < a.length; i++)
52	+	assertEquals(a[i], aa.get(i));
53	+	}
54	+
55	+	/**
56	+	* get and set for out of bound indices throw IndexOutOfBoundsException
57	+	*/
58	+	@SuppressWarnings("deprecation")
59	+	public void testIndexing() {
60	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
61	+	for (int index : new int[] { -1, SIZE }) {
62	+	try {
63	+	aa.get(index);
64	+	shouldThrow();
65	+	} catch (IndexOutOfBoundsException success) {}
66	+	try {
67	+	aa.set(index, 1);
68	+	shouldThrow();
69	+	} catch (IndexOutOfBoundsException success) {}
70	+	try {
71	+	aa.lazySet(index, 1);
72	+	shouldThrow();
73	+	} catch (IndexOutOfBoundsException success) {}
74	+	try {
75	+	aa.compareAndSet(index, 1, 2);
76	+	shouldThrow();
77	+	} catch (IndexOutOfBoundsException success) {}
78	+	try {
79	+	aa.weakCompareAndSet(index, 1, 2);
80	+	shouldThrow();
81	+	} catch (IndexOutOfBoundsException success) {}
82	+	try {
83	+	aa.getAndAdd(index, 1);
84	+	shouldThrow();
85	+	} catch (IndexOutOfBoundsException success) {}
86	+	try {
87	+	aa.addAndGet(index, 1);
88	+	shouldThrow();
89	+	} catch (IndexOutOfBoundsException success) {}
90	+	}
91	+	}
92	+
93	+	/**
94	+	* get returns the last value set at index
95	+	*/
96	+	public void testGetSet() {
97	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
98	+	for (int i = 0; i < SIZE; i++) {
99	+	aa.set(i, 1);
100	+	assertEquals(1, aa.get(i));
101	+	aa.set(i, 2);
102	+	assertEquals(2, aa.get(i));
103	+	aa.set(i, -3);
104	+	assertEquals(-3, aa.get(i));
105	+	}
106	+	}
107	+
108	+	/**
109	+	* get returns the last value lazySet at index by same thread
110	+	*/
111	+	public void testGetLazySet() {
112	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
113	+	for (int i = 0; i < SIZE; i++) {
114	+	aa.lazySet(i, 1);
115	+	assertEquals(1, aa.get(i));
116	+	aa.lazySet(i, 2);
117	+	assertEquals(2, aa.get(i));
118	+	aa.lazySet(i, -3);
119	+	assertEquals(-3, aa.get(i));
120	+	}
121	+	}
122	+
123	+	/**
124	+	* compareAndSet succeeds in changing value if equal to expected else fails
125	+	*/
126	+	public void testCompareAndSet() {
127	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
128	+	for (int i = 0; i < SIZE; i++) {
129	+	aa.set(i, 1);
130	+	assertTrue(aa.compareAndSet(i, 1, 2));
131	+	assertTrue(aa.compareAndSet(i, 2, -4));
132	+	assertEquals(-4, aa.get(i));
133	+	assertFalse(aa.compareAndSet(i, -5, 7));
134	+	assertEquals(-4, aa.get(i));
135	+	assertTrue(aa.compareAndSet(i, -4, 7));
136	+	assertEquals(7, aa.get(i));
137	+	}
138	+	}
139	+
140	+	/**
141	+	* compareAndSet in one thread enables another waiting for value
142	+	* to succeed
143	+	*/
144	+	public void testCompareAndSetInMultipleThreads() throws Exception {
145	+	final AtomicIntegerArray a = new AtomicIntegerArray(1);
146	+	a.set(0, 1);
147	+	Thread t = new Thread(new CheckedRunnable() {
148	+	public void realRun() {
149	+	while (!a.compareAndSet(0, 2, 3))
150	+	Thread.yield();
151	+	}});
152	+
153	+	t.start();
154	+	assertTrue(a.compareAndSet(0, 1, 2));
155	+	t.join(LONG_DELAY_MS);
156	+	assertFalse(t.isAlive());
157	+	assertEquals(3, a.get(0));
158	+	}
159	+
160	+	/**
161	+	* repeated weakCompareAndSet succeeds in changing value when equal
162	+	* to expected
163	+	*/
164	+	@SuppressWarnings("deprecation")
165	+	public void testWeakCompareAndSet() {
166	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
167	+	for (int i = 0; i < SIZE; i++) {
168	+	aa.set(i, 1);
169	+	do {} while (!aa.weakCompareAndSet(i, 1, 2));
170	+	do {} while (!aa.weakCompareAndSet(i, 2, -4));
171	+	assertEquals(-4, aa.get(i));
172	+	do {} while (!aa.weakCompareAndSet(i, -4, 7));
173	+	assertEquals(7, aa.get(i));
174	+	}
175	+	}
176	+
177	+	/**
178	+	* getAndSet returns previous value and sets to given value at given index
179	+	*/
180	+	public void testGetAndSet() {
181	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
182	+	for (int i = 0; i < SIZE; i++) {
183	+	aa.set(i, 1);
184	+	assertEquals(1, aa.getAndSet(i, 0));
185	+	assertEquals(0, aa.getAndSet(i, -10));
186	+	assertEquals(-10, aa.getAndSet(i, 1));
187	+	}
188	+	}
189	+
190	+	/**
191	+	* getAndAdd returns previous value and adds given value
192	+	*/
193	+	public void testGetAndAdd() {
194	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
195	+	for (int i = 0; i < SIZE; i++) {
196	+	aa.set(i, 1);
197	+	assertEquals(1, aa.getAndAdd(i, 2));
198	+	assertEquals(3, aa.get(i));
199	+	assertEquals(3, aa.getAndAdd(i, -4));
200	+	assertEquals(-1, aa.get(i));
201	+	}
202	+	}
203	+
204	+	/**
205	+	* getAndDecrement returns previous value and decrements
206	+	*/
207	+	public void testGetAndDecrement() {
208	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
209	+	for (int i = 0; i < SIZE; i++) {
210	+	aa.set(i, 1);
211	+	assertEquals(1, aa.getAndDecrement(i));
212	+	assertEquals(0, aa.getAndDecrement(i));
213	+	assertEquals(-1, aa.getAndDecrement(i));
214	+	}
215	+	}
216	+
217	+	/**
218	+	* getAndIncrement returns previous value and increments
219	+	*/
220	+	public void testGetAndIncrement() {
221	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
222	+	for (int i = 0; i < SIZE; i++) {
223	+	aa.set(i, 1);
224	+	assertEquals(1, aa.getAndIncrement(i));
225	+	assertEquals(2, aa.get(i));
226	+	aa.set(i, -2);
227	+	assertEquals(-2, aa.getAndIncrement(i));
228	+	assertEquals(-1, aa.getAndIncrement(i));
229	+	assertEquals(0, aa.getAndIncrement(i));
230	+	assertEquals(1, aa.get(i));
231	+	}
232	+	}
233	+
234	+	/**
235	+	* addAndGet adds given value to current, and returns current value
236	+	*/
237		public void testAddAndGet() {
238	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
239	<	for (int i = 0; i < N; ++i) {
240	<	ai.set(i, 1);
241	<	assertEquals(3,ai.addAndGet(i,2));
242	<	assertEquals(3,ai.get(i));
243	<	assertEquals(-1,ai.addAndGet(i,-4));
244	<	assertEquals(-1,ai.get(i));
238	>	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
239	>	for (int i = 0; i < SIZE; i++) {
240	>	aa.set(i, 1);
241	>	assertEquals(3, aa.addAndGet(i, 2));
242	>	assertEquals(3, aa.get(i));
243	>	assertEquals(-1, aa.addAndGet(i, -4));
244	>	assertEquals(-1, aa.get(i));
245		}
246		}
247
248	<	public void testDecrementAndGet(){
249	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
250	<	for (int i = 0; i < N; ++i) {
251	<	ai.set(i, 1);
252	<	assertEquals(0,ai.decrementAndGet(i));
253	<	assertEquals(-1,ai.decrementAndGet(i));
254	<	assertEquals(-2,ai.decrementAndGet(i));
255	<	assertEquals(-2,ai.get(i));
248	>	/**
249	>	* decrementAndGet decrements and returns current value
250	>	*/
251	>	public void testDecrementAndGet() {
252	>	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
253	>	for (int i = 0; i < SIZE; i++) {
254	>	aa.set(i, 1);
255	>	assertEquals(0, aa.decrementAndGet(i));
256	>	assertEquals(-1, aa.decrementAndGet(i));
257	>	assertEquals(-2, aa.decrementAndGet(i));
258	>	assertEquals(-2, aa.get(i));
259		}
260		}
261
262	+	/**
263	+	* incrementAndGet increments and returns current value
264	+	*/
265		public void testIncrementAndGet() {
266	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
267	<	for (int i = 0; i < N; ++i) {
268	<	ai.set(i, 1);
269	<	assertEquals(2,ai.incrementAndGet(i));
270	<	assertEquals(2,ai.get(i));
271	<	ai.set(i, -2);
272	<	assertEquals(-1,ai.incrementAndGet(i));
273	<	assertEquals(0,ai.incrementAndGet(i));
274	<	assertEquals(1,ai.incrementAndGet(i));
275	<	assertEquals(1,ai.get(i));
266	>	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
267	>	for (int i = 0; i < SIZE; i++) {
268	>	aa.set(i, 1);
269	>	assertEquals(2, aa.incrementAndGet(i));
270	>	assertEquals(2, aa.get(i));
271	>	aa.set(i, -2);
272	>	assertEquals(-1, aa.incrementAndGet(i));
273	>	assertEquals(0, aa.incrementAndGet(i));
274	>	assertEquals(1, aa.incrementAndGet(i));
275	>	assertEquals(1, aa.get(i));
276		}
277		}
278
279	<	public void testSerialization() {
280	<	AtomicIntegerArray l = new AtomicIntegerArray(N);
281	<	for (int i = 0; i < N; ++i)
282	<	l.set(i, -i);
283	<
284	<	try {
285	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
286	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
287	<	out.writeObject(l);
288	<	out.close();
289	<
290	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
291	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
292	<	AtomicIntegerArray r = (AtomicIntegerArray) in.readObject();
293	<	for (int i = 0; i < N; ++i) {
294	<	assertEquals(l.get(i), r.get(i));
279	>	class Counter extends CheckedRunnable {
280	>	final AtomicIntegerArray aa;
281	>	int decs;
282	>	Counter(AtomicIntegerArray a) { aa = a; }
283	>	public void realRun() {
284	>	for (;;) {
285	>	boolean done = true;
286	>	for (int i = 0; i < aa.length(); i++) {
287	>	int v = aa.get(i);
288	>	assertTrue(v >= 0);
289	>	if (v != 0) {
290	>	done = false;
291	>	if (aa.compareAndSet(i, v, v - 1))
292	>	decs++;
293	>	}
294	>	}
295	>	if (done)
296	>	break;
297		}
165	–	} catch(Exception e){
166	–	e.printStackTrace();
167	–	fail("unexpected exception");
298		}
299		}
300
301	+	/**
302	+	* Multiple threads using same array of counters successfully
303	+	* update a number of times equal to total count
304	+	*/
305	+	public void testCountingInMultipleThreads() throws InterruptedException {
306	+	final AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
307	+	int countdown = 10000;
308	+	for (int i = 0; i < SIZE; i++)
309	+	aa.set(i, countdown);
310	+	Counter c1 = new Counter(aa);
311	+	Counter c2 = new Counter(aa);
312	+	Thread t1 = newStartedThread(c1);
313	+	Thread t2 = newStartedThread(c2);
314	+	t1.join();
315	+	t2.join();
316	+	assertEquals(c1.decs + c2.decs, SIZE * countdown);
317	+	}
318	+
319	+	/**
320	+	* a deserialized/reserialized array holds same values in same order
321	+	*/
322	+	public void testSerialization() throws Exception {
323	+	AtomicIntegerArray x = new AtomicIntegerArray(SIZE);
324	+	for (int i = 0; i < SIZE; i++)
325	+	x.set(i, -i);
326	+	AtomicIntegerArray y = serialClone(x);
327	+	assertNotSame(x, y);
328	+	assertEquals(x.length(), y.length());
329	+	for (int i = 0; i < SIZE; i++) {
330	+	assertEquals(x.get(i), y.get(i));
331	+	}
332	+	}
333	+
334	+	/**
335	+	* toString returns current value.
336	+	*/
337	+	public void testToString() {
338	+	int[] a = { 17, 3, -42, 99, -7 };
339	+	AtomicIntegerArray aa = new AtomicIntegerArray(a);
340	+	assertEquals(Arrays.toString(a), aa.toString());
341	+	}
342	+
343		}

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