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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 1.30 by jsr166, Wed Dec 31 19:21:20 2014 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	>	junit.textui.TestRunner.run(suite());
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	+	AtomicIntegerArray aa = 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	+	public void testIndexing() {
59	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
60	+	for (int index : new int[] { -1, SIZE }) {
61	+	try {
62	+	aa.get(index);
63	+	shouldThrow();
64	+	} catch (IndexOutOfBoundsException success) {}
65	+	try {
66	+	aa.set(index, 1);
67	+	shouldThrow();
68	+	} catch (IndexOutOfBoundsException success) {}
69	+	try {
70	+	aa.lazySet(index, 1);
71	+	shouldThrow();
72	+	} catch (IndexOutOfBoundsException success) {}
73	+	try {
74	+	aa.compareAndSet(index, 1, 2);
75	+	shouldThrow();
76	+	} catch (IndexOutOfBoundsException success) {}
77	+	try {
78	+	aa.weakCompareAndSet(index, 1, 2);
79	+	shouldThrow();
80	+	} catch (IndexOutOfBoundsException success) {}
81	+	try {
82	+	aa.getAndAdd(index, 1);
83	+	shouldThrow();
84	+	} catch (IndexOutOfBoundsException success) {}
85	+	try {
86	+	aa.addAndGet(index, 1);
87	+	shouldThrow();
88	+	} catch (IndexOutOfBoundsException success) {}
89	+	}
90	+	}
91	+
92	+	/**
93	+	* get returns the last value set at index
94	+	*/
95	+	public void testGetSet() {
96	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
97	+	for (int i = 0; i < SIZE; i++) {
98	+	aa.set(i, 1);
99	+	assertEquals(1, aa.get(i));
100	+	aa.set(i, 2);
101	+	assertEquals(2, aa.get(i));
102	+	aa.set(i, -3);
103	+	assertEquals(-3, aa.get(i));
104	+	}
105	+	}
106	+
107	+	/**
108	+	* get returns the last value lazySet at index by same thread
109	+	*/
110	+	public void testGetLazySet() {
111	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
112	+	for (int i = 0; i < SIZE; i++) {
113	+	aa.lazySet(i, 1);
114	+	assertEquals(1, aa.get(i));
115	+	aa.lazySet(i, 2);
116	+	assertEquals(2, aa.get(i));
117	+	aa.lazySet(i, -3);
118	+	assertEquals(-3, aa.get(i));
119	+	}
120	+	}
121	+
122	+	/**
123	+	* compareAndSet succeeds in changing value if equal to expected else fails
124	+	*/
125	+	public void testCompareAndSet() {
126	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
127	+	for (int i = 0; i < SIZE; i++) {
128	+	aa.set(i, 1);
129	+	assertTrue(aa.compareAndSet(i, 1, 2));
130	+	assertTrue(aa.compareAndSet(i, 2, -4));
131	+	assertEquals(-4, aa.get(i));
132	+	assertFalse(aa.compareAndSet(i, -5, 7));
133	+	assertEquals(-4, aa.get(i));
134	+	assertTrue(aa.compareAndSet(i, -4, 7));
135	+	assertEquals(7, aa.get(i));
136	+	}
137	+	}
138	+
139	+	/**
140	+	* compareAndSet in one thread enables another waiting for value
141	+	* to succeed
142	+	*/
143	+	public void testCompareAndSetInMultipleThreads() throws Exception {
144	+	final AtomicIntegerArray a = new AtomicIntegerArray(1);
145	+	a.set(0, 1);
146	+	Thread t = new Thread(new CheckedRunnable() {
147	+	public void realRun() {
148	+	while (!a.compareAndSet(0, 2, 3))
149	+	Thread.yield();
150	+	}});
151	+
152	+	t.start();
153	+	assertTrue(a.compareAndSet(0, 1, 2));
154	+	t.join(LONG_DELAY_MS);
155	+	assertFalse(t.isAlive());
156	+	assertEquals(3, a.get(0));
157	+	}
158	+
159	+	/**
160	+	* repeated weakCompareAndSet succeeds in changing value when equal
161	+	* to expected
162	+	*/
163	+	public void testWeakCompareAndSet() {
164	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
165	+	for (int i = 0; i < SIZE; i++) {
166	+	aa.set(i, 1);
167	+	do {} while (!aa.weakCompareAndSet(i, 1, 2));
168	+	do {} while (!aa.weakCompareAndSet(i, 2, -4));
169	+	assertEquals(-4, aa.get(i));
170	+	do {} while (!aa.weakCompareAndSet(i, -4, 7));
171	+	assertEquals(7, aa.get(i));
172	+	}
173	+	}
174	+
175	+	/**
176	+	* getAndSet returns previous value and sets to given value at given index
177	+	*/
178	+	public void testGetAndSet() {
179	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
180	+	for (int i = 0; i < SIZE; i++) {
181	+	aa.set(i, 1);
182	+	assertEquals(1, aa.getAndSet(i, 0));
183	+	assertEquals(0, aa.getAndSet(i, -10));
184	+	assertEquals(-10, aa.getAndSet(i, 1));
185	+	}
186	+	}
187	+
188	+	/**
189	+	* getAndAdd returns previous value and adds given value
190	+	*/
191	+	public void testGetAndAdd() {
192	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
193	+	for (int i = 0; i < SIZE; i++) {
194	+	aa.set(i, 1);
195	+	assertEquals(1, aa.getAndAdd(i, 2));
196	+	assertEquals(3, aa.get(i));
197	+	assertEquals(3, aa.getAndAdd(i, -4));
198	+	assertEquals(-1, aa.get(i));
199	+	}
200	+	}
201	+
202	+	/**
203	+	* getAndDecrement returns previous value and decrements
204	+	*/
205	+	public void testGetAndDecrement() {
206	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
207	+	for (int i = 0; i < SIZE; i++) {
208	+	aa.set(i, 1);
209	+	assertEquals(1, aa.getAndDecrement(i));
210	+	assertEquals(0, aa.getAndDecrement(i));
211	+	assertEquals(-1, aa.getAndDecrement(i));
212	+	}
213	+	}
214	+
215	+	/**
216	+	* getAndIncrement returns previous value and increments
217	+	*/
218	+	public void testGetAndIncrement() {
219	+	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
220	+	for (int i = 0; i < SIZE; i++) {
221	+	aa.set(i, 1);
222	+	assertEquals(1, aa.getAndIncrement(i));
223	+	assertEquals(2, aa.get(i));
224	+	aa.set(i, -2);
225	+	assertEquals(-2, aa.getAndIncrement(i));
226	+	assertEquals(-1, aa.getAndIncrement(i));
227	+	assertEquals(0, aa.getAndIncrement(i));
228	+	assertEquals(1, aa.get(i));
229	+	}
230	+	}
231	+
232	+	/**
233	+	* addAndGet adds given value to current, and returns current value
234	+	*/
235		public void testAddAndGet() {
236	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
237	<	for (int i = 0; i < N; ++i) {
238	<	ai.set(i, 1);
239	<	assertEquals(3,ai.addAndGet(i,2));
240	<	assertEquals(3,ai.get(i));
241	<	assertEquals(-1,ai.addAndGet(i,-4));
242	<	assertEquals(-1,ai.get(i));
236	>	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
237	>	for (int i = 0; i < SIZE; i++) {
238	>	aa.set(i, 1);
239	>	assertEquals(3, aa.addAndGet(i, 2));
240	>	assertEquals(3, aa.get(i));
241	>	assertEquals(-1, aa.addAndGet(i, -4));
242	>	assertEquals(-1, aa.get(i));
243		}
244		}
245
246	<	public void testDecrementAndGet(){
247	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
248	<	for (int i = 0; i < N; ++i) {
249	<	ai.set(i, 1);
250	<	assertEquals(0,ai.decrementAndGet(i));
251	<	assertEquals(-1,ai.decrementAndGet(i));
252	<	assertEquals(-2,ai.decrementAndGet(i));
253	<	assertEquals(-2,ai.get(i));
246	>	/**
247	>	* decrementAndGet decrements and returns current value
248	>	*/
249	>	public void testDecrementAndGet() {
250	>	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
251	>	for (int i = 0; i < SIZE; i++) {
252	>	aa.set(i, 1);
253	>	assertEquals(0, aa.decrementAndGet(i));
254	>	assertEquals(-1, aa.decrementAndGet(i));
255	>	assertEquals(-2, aa.decrementAndGet(i));
256	>	assertEquals(-2, aa.get(i));
257		}
258		}
259
260	+	/**
261	+	* incrementAndGet increments and returns current value
262	+	*/
263		public void testIncrementAndGet() {
264	<	AtomicIntegerArray ai = new AtomicIntegerArray(N);
265	<	for (int i = 0; i < N; ++i) {
266	<	ai.set(i, 1);
267	<	assertEquals(2,ai.incrementAndGet(i));
268	<	assertEquals(2,ai.get(i));
269	<	ai.set(i, -2);
270	<	assertEquals(-1,ai.incrementAndGet(i));
271	<	assertEquals(0,ai.incrementAndGet(i));
272	<	assertEquals(1,ai.incrementAndGet(i));
273	<	assertEquals(1,ai.get(i));
264	>	AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
265	>	for (int i = 0; i < SIZE; i++) {
266	>	aa.set(i, 1);
267	>	assertEquals(2, aa.incrementAndGet(i));
268	>	assertEquals(2, aa.get(i));
269	>	aa.set(i, -2);
270	>	assertEquals(-1, aa.incrementAndGet(i));
271	>	assertEquals(0, aa.incrementAndGet(i));
272	>	assertEquals(1, aa.incrementAndGet(i));
273	>	assertEquals(1, aa.get(i));
274		}
275		}
276
277	<	public void testSerialization() {
278	<	AtomicIntegerArray l = new AtomicIntegerArray(N);
279	<	for (int i = 0; i < N; ++i)
280	<	l.set(i, -i);
281	<
282	<	try {
283	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
284	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
285	<	out.writeObject(l);
286	<	out.close();
287	<
288	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
289	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
290	<	AtomicIntegerArray r = (AtomicIntegerArray) in.readObject();
291	<	for (int i = 0; i < N; ++i) {
292	<	assertEquals(l.get(i), r.get(i));
277	>	class Counter extends CheckedRunnable {
278	>	final AtomicIntegerArray aa;
279	>	volatile int counts;
280	>	Counter(AtomicIntegerArray a) { aa = a; }
281	>	public void realRun() {
282	>	for (;;) {
283	>	boolean done = true;
284	>	for (int i = 0; i < aa.length(); i++) {
285	>	int v = aa.get(i);
286	>	assertTrue(v >= 0);
287	>	if (v != 0) {
288	>	done = false;
289	>	if (aa.compareAndSet(i, v, v-1))
290	>	++counts;
291	>	}
292	>	}
293	>	if (done)
294	>	break;
295		}
165	–	} catch(Exception e){
166	–	e.printStackTrace();
167	–	fail("unexpected exception");
296		}
297		}
298
299	+	/**
300	+	* Multiple threads using same array of counters successfully
301	+	* update a number of times equal to total count
302	+	*/
303	+	public void testCountingInMultipleThreads() throws InterruptedException {
304	+	final AtomicIntegerArray aa = new AtomicIntegerArray(SIZE);
305	+	int countdown = 10000;
306	+	for (int i = 0; i < SIZE; i++)
307	+	aa.set(i, countdown);
308	+	Counter c1 = new Counter(aa);
309	+	Counter c2 = new Counter(aa);
310	+	Thread t1 = new Thread(c1);
311	+	Thread t2 = new Thread(c2);
312	+	t1.start();
313	+	t2.start();
314	+	t1.join();
315	+	t2.join();
316	+	assertEquals(c1.counts+c2.counts, SIZE * countdown);
317	+	}
318	+
319	+	/**
320	+	* a deserialized serialized array holds same values
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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