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

Comparing jsr166/src/test/tck/AtomicLongArrayTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:53 2003 UTC vs.
Revision 1.27 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.*;
10	>	import java.util.Arrays;
11	>	import java.util.concurrent.atomic.AtomicLongArray;
12
13	<	public class AtomicLongArrayTest extends TestCase
14	<	{
15	<	static final int N = 10;
14	<
15	<	public static void main (String[] args) {
16	<	junit.textui.TestRunner.run (suite());
13	>	public class AtomicLongArrayTest extends JSR166TestCase {
14	>	public static void main(String[] args) {
15	>	junit.textui.TestRunner.run(suite());
16		}
17		public static Test suite() {
18		return new TestSuite(AtomicLongArrayTest.class);
19		}
20
21	<	public void testConstructor(){
22	<	AtomicLongArray ai = new AtomicLongArray(N);
23	<	for (int i = 0; i < N; ++i)
24	<	assertEquals(0,ai.get(i));
25	<	}
26	<
27	<	public void testGetSet(){
28	<	AtomicLongArray ai = new AtomicLongArray(N);
29	<	for (int i = 0; i < N; ++i) {
30	<	ai.set(i, 1);
31	<	assertEquals(1,ai.get(i));
32	<	ai.set(i, 2);
33	<	assertEquals(2,ai.get(i));
34	<	ai.set(i, -3);
35	<	assertEquals(-3,ai.get(i));
36	<	}
37	<	}
38	<
39	<	public void testCompareAndSet(){
40	<	AtomicLongArray ai = new AtomicLongArray(N);
41	<	for (int i = 0; i < N; ++i) {
42	<	ai.set(i, 1);
43	<	assertTrue(ai.compareAndSet(i, 1,2));
44	<	assertTrue(ai.compareAndSet(i, 2,-4));
45	<	assertEquals(-4,ai.get(i));
46	<	assertFalse(ai.compareAndSet(i, -5,7));
47	<	assertFalse((7 == ai.get(i)));
48	<	assertTrue(ai.compareAndSet(i, -4,7));
49	<	assertEquals(7,ai.get(i));
50	<	}
51	<	}
52	<
53	<	public void testWeakCompareAndSet(){
54	<	AtomicLongArray ai = new AtomicLongArray(N);
55	<	for (int i = 0; i < N; ++i) {
56	<	ai.set(i, 1);
57	<	while(!ai.weakCompareAndSet(i, 1,2));
58	<	while(!ai.weakCompareAndSet(i, 2,-4));
59	<	assertEquals(-4,ai.get(i));
60	<	while(!ai.weakCompareAndSet(i, -4,7));
61	<	assertEquals(7,ai.get(i));
62	<	}
63	<	}
64	<
65	<	public void testGetAndSet(){
66	<	AtomicLongArray ai = new AtomicLongArray(N);
67	<	for (int i = 0; i < N; ++i) {
68	<	ai.set(i, 1);
69	<	assertEquals(1,ai.getAndSet(i,0));
70	<	assertEquals(0,ai.getAndSet(i,-10));
71	<	assertEquals(-10,ai.getAndSet(i,1));
72	<	}
73	<	}
74	<
75	<	public void testGetAndAdd(){
76	<	AtomicLongArray ai = new AtomicLongArray(N);
77	<	for (int i = 0; i < N; ++i) {
78	<	ai.set(i, 1);
79	<	assertEquals(1,ai.getAndAdd(i,2));
80	<	assertEquals(3,ai.get(i));
81	<	assertEquals(3,ai.getAndAdd(i,-4));
82	<	assertEquals(-1,ai.get(i));
83	<	}
84	<	}
85	<
87	<	public void testGetAndDecrement(){
88	<	AtomicLongArray ai = new AtomicLongArray(N);
89	<	for (int i = 0; i < N; ++i) {
90	<	ai.set(i, 1);
91	<	assertEquals(1,ai.getAndDecrement(i));
92	<	assertEquals(0,ai.getAndDecrement(i));
93	<	assertEquals(-1,ai.getAndDecrement(i));
94	<	}
95	<	}
96	<
97	<	public void testGetAndIncrement(){
98	<	AtomicLongArray ai = new AtomicLongArray(N);
99	<	for (int i = 0; i < N; ++i) {
100	<	ai.set(i, 1);
101	<	assertEquals(1,ai.getAndIncrement(i));
102	<	assertEquals(2,ai.get(i));
103	<	ai.set(i,-2);
104	<	assertEquals(-2,ai.getAndIncrement(i));
105	<	assertEquals(-1,ai.getAndIncrement(i));
106	<	assertEquals(0,ai.getAndIncrement(i));
107	<	assertEquals(1,ai.get(i));
21	>	/**
22	>	* constructor creates array of given size with all elements zero
23	>	*/
24	>	public void testConstructor() {
25	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
26	>	for (int i = 0; i < SIZE; i++)
27	>	assertEquals(0, aa.get(i));
28	>	}
29	>
30	>	/**
31	>	* constructor with null array throws NPE
32	>	*/
33	>	public void testConstructor2NPE() {
34	>	try {
35	>	long[] a = null;
36	>	AtomicLongArray aa = new AtomicLongArray(a);
37	>	shouldThrow();
38	>	} catch (NullPointerException success) {}
39	>	}
40	>
41	>	/**
42	>	* constructor with array is of same size and has all elements
43	>	*/
44	>	public void testConstructor2() {
45	>	long[] a = { 17L, 3L, -42L, 99L, -7L };
46	>	AtomicLongArray aa = new AtomicLongArray(a);
47	>	assertEquals(a.length, aa.length());
48	>	for (int i = 0; i < a.length; i++)
49	>	assertEquals(a[i], aa.get(i));
50	>	}
51	>
52	>	/**
53	>	* get and set for out of bound indices throw IndexOutOfBoundsException
54	>	*/
55	>	public void testIndexing() {
56	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
57	>	for (int index : new int[] { -1, SIZE }) {
58	>	try {
59	>	aa.get(index);
60	>	shouldThrow();
61	>	} catch (IndexOutOfBoundsException success) {}
62	>	try {
63	>	aa.set(index, 1);
64	>	shouldThrow();
65	>	} catch (IndexOutOfBoundsException success) {}
66	>	try {
67	>	aa.lazySet(index, 1);
68	>	shouldThrow();
69	>	} catch (IndexOutOfBoundsException success) {}
70	>	try {
71	>	aa.compareAndSet(index, 1, 2);
72	>	shouldThrow();
73	>	} catch (IndexOutOfBoundsException success) {}
74	>	try {
75	>	aa.weakCompareAndSet(index, 1, 2);
76	>	shouldThrow();
77	>	} catch (IndexOutOfBoundsException success) {}
78	>	try {
79	>	aa.getAndAdd(index, 1);
80	>	shouldThrow();
81	>	} catch (IndexOutOfBoundsException success) {}
82	>	try {
83	>	aa.addAndGet(index, 1);
84	>	shouldThrow();
85	>	} catch (IndexOutOfBoundsException success) {}
86		}
87		}
88
89	+	/**
90	+	* get returns the last value set at index
91	+	*/
92	+	public void testGetSet() {
93	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
94	+	for (int i = 0; i < SIZE; i++) {
95	+	aa.set(i, 1);
96	+	assertEquals(1, aa.get(i));
97	+	aa.set(i, 2);
98	+	assertEquals(2, aa.get(i));
99	+	aa.set(i, -3);
100	+	assertEquals(-3, aa.get(i));
101	+	}
102	+	}
103	+
104	+	/**
105	+	* get returns the last value lazySet at index by same thread
106	+	*/
107	+	public void testGetLazySet() {
108	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
109	+	for (int i = 0; i < SIZE; i++) {
110	+	aa.lazySet(i, 1);
111	+	assertEquals(1, aa.get(i));
112	+	aa.lazySet(i, 2);
113	+	assertEquals(2, aa.get(i));
114	+	aa.lazySet(i, -3);
115	+	assertEquals(-3, aa.get(i));
116	+	}
117	+	}
118	+
119	+	/**
120	+	* compareAndSet succeeds in changing value if equal to expected else fails
121	+	*/
122	+	public void testCompareAndSet() {
123	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
124	+	for (int i = 0; i < SIZE; i++) {
125	+	aa.set(i, 1);
126	+	assertTrue(aa.compareAndSet(i, 1, 2));
127	+	assertTrue(aa.compareAndSet(i, 2, -4));
128	+	assertEquals(-4, aa.get(i));
129	+	assertFalse(aa.compareAndSet(i, -5, 7));
130	+	assertEquals(-4, aa.get(i));
131	+	assertTrue(aa.compareAndSet(i, -4, 7));
132	+	assertEquals(7, aa.get(i));
133	+	}
134	+	}
135	+
136	+	/**
137	+	* compareAndSet in one thread enables another waiting for value
138	+	* to succeed
139	+	*/
140	+	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
141	+	final AtomicLongArray a = new AtomicLongArray(1);
142	+	a.set(0, 1);
143	+	Thread t = new Thread(new CheckedRunnable() {
144	+	public void realRun() {
145	+	while (!a.compareAndSet(0, 2, 3))
146	+	Thread.yield();
147	+	}});
148	+
149	+	t.start();
150	+	assertTrue(a.compareAndSet(0, 1, 2));
151	+	t.join(LONG_DELAY_MS);
152	+	assertFalse(t.isAlive());
153	+	assertEquals(3, a.get(0));
154	+	}
155	+
156	+	/**
157	+	* repeated weakCompareAndSet succeeds in changing value when equal
158	+	* to expected
159	+	*/
160	+	public void testWeakCompareAndSet() {
161	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
162	+	for (int i = 0; i < SIZE; i++) {
163	+	aa.set(i, 1);
164	+	while (!aa.weakCompareAndSet(i, 1, 2));
165	+	while (!aa.weakCompareAndSet(i, 2, -4));
166	+	assertEquals(-4, aa.get(i));
167	+	while (!aa.weakCompareAndSet(i, -4, 7));
168	+	assertEquals(7, aa.get(i));
169	+	}
170	+	}
171	+
172	+	/**
173	+	* getAndSet returns previous value and sets to given value at given index
174	+	*/
175	+	public void testGetAndSet() {
176	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
177	+	for (int i = 0; i < SIZE; i++) {
178	+	aa.set(i, 1);
179	+	assertEquals(1, aa.getAndSet(i, 0));
180	+	assertEquals(0, aa.getAndSet(i, -10));
181	+	assertEquals(-10, aa.getAndSet(i, 1));
182	+	}
183	+	}
184	+
185	+	/**
186	+	* getAndAdd returns previous value and adds given value
187	+	*/
188	+	public void testGetAndAdd() {
189	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
190	+	for (int i = 0; i < SIZE; i++) {
191	+	aa.set(i, 1);
192	+	assertEquals(1, aa.getAndAdd(i, 2));
193	+	assertEquals(3, aa.get(i));
194	+	assertEquals(3, aa.getAndAdd(i, -4));
195	+	assertEquals(-1, aa.get(i));
196	+	}
197	+	}
198	+
199	+	/**
200	+	* getAndDecrement returns previous value and decrements
201	+	*/
202	+	public void testGetAndDecrement() {
203	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
204	+	for (int i = 0; i < SIZE; i++) {
205	+	aa.set(i, 1);
206	+	assertEquals(1, aa.getAndDecrement(i));
207	+	assertEquals(0, aa.getAndDecrement(i));
208	+	assertEquals(-1, aa.getAndDecrement(i));
209	+	}
210	+	}
211	+
212	+	/**
213	+	* getAndIncrement returns previous value and increments
214	+	*/
215	+	public void testGetAndIncrement() {
216	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
217	+	for (int i = 0; i < SIZE; i++) {
218	+	aa.set(i, 1);
219	+	assertEquals(1, aa.getAndIncrement(i));
220	+	assertEquals(2, aa.get(i));
221	+	aa.set(i, -2);
222	+	assertEquals(-2, aa.getAndIncrement(i));
223	+	assertEquals(-1, aa.getAndIncrement(i));
224	+	assertEquals(0, aa.getAndIncrement(i));
225	+	assertEquals(1, aa.get(i));
226	+	}
227	+	}
228	+
229	+	/**
230	+	* addAndGet adds given value to current, and returns current value
231	+	*/
232		public void testAddAndGet() {
233	<	AtomicLongArray ai = new AtomicLongArray(N);
234	<	for (int i = 0; i < N; ++i) {
235	<	ai.set(i, 1);
236	<	assertEquals(3,ai.addAndGet(i,2));
237	<	assertEquals(3,ai.get(i));
238	<	assertEquals(-1,ai.addAndGet(i,-4));
239	<	assertEquals(-1,ai.get(i));
233	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
234	>	for (int i = 0; i < SIZE; i++) {
235	>	aa.set(i, 1);
236	>	assertEquals(3, aa.addAndGet(i, 2));
237	>	assertEquals(3, aa.get(i));
238	>	assertEquals(-1, aa.addAndGet(i, -4));
239	>	assertEquals(-1, aa.get(i));
240		}
241		}
242
243	<	public void testDecrementAndGet(){
244	<	AtomicLongArray ai = new AtomicLongArray(N);
245	<	for (int i = 0; i < N; ++i) {
246	<	ai.set(i, 1);
247	<	assertEquals(0,ai.decrementAndGet(i));
248	<	assertEquals(-1,ai.decrementAndGet(i));
249	<	assertEquals(-2,ai.decrementAndGet(i));
250	<	assertEquals(-2,ai.get(i));
243	>	/**
244	>	* decrementAndGet decrements and returns current value
245	>	*/
246	>	public void testDecrementAndGet() {
247	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
248	>	for (int i = 0; i < SIZE; i++) {
249	>	aa.set(i, 1);
250	>	assertEquals(0, aa.decrementAndGet(i));
251	>	assertEquals(-1, aa.decrementAndGet(i));
252	>	assertEquals(-2, aa.decrementAndGet(i));
253	>	assertEquals(-2, aa.get(i));
254		}
255		}
256
257	+	/**
258	+	* incrementAndGet increments and returns current value
259	+	*/
260		public void testIncrementAndGet() {
261	<	AtomicLongArray ai = new AtomicLongArray(N);
262	<	for (int i = 0; i < N; ++i) {
263	<	ai.set(i, 1);
264	<	assertEquals(2,ai.incrementAndGet(i));
265	<	assertEquals(2,ai.get(i));
266	<	ai.set(i, -2);
267	<	assertEquals(-1,ai.incrementAndGet(i));
268	<	assertEquals(0,ai.incrementAndGet(i));
269	<	assertEquals(1,ai.incrementAndGet(i));
270	<	assertEquals(1,ai.get(i));
261	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
262	>	for (int i = 0; i < SIZE; i++) {
263	>	aa.set(i, 1);
264	>	assertEquals(2, aa.incrementAndGet(i));
265	>	assertEquals(2, aa.get(i));
266	>	aa.set(i, -2);
267	>	assertEquals(-1, aa.incrementAndGet(i));
268	>	assertEquals(0, aa.incrementAndGet(i));
269	>	assertEquals(1, aa.incrementAndGet(i));
270	>	assertEquals(1, aa.get(i));
271		}
272		}
273
274	+	class Counter extends CheckedRunnable {
275	+	final AtomicLongArray aa;
276	+	volatile long counts;
277	+	Counter(AtomicLongArray a) { aa = a; }
278	+	public void realRun() {
279	+	for (;;) {
280	+	boolean done = true;
281	+	for (int i = 0; i < aa.length(); i++) {
282	+	long v = aa.get(i);
283	+	assertTrue(v >= 0);
284	+	if (v != 0) {
285	+	done = false;
286	+	if (aa.compareAndSet(i, v, v-1))
287	+	++counts;
288	+	}
289	+	}
290	+	if (done)
291	+	break;
292	+	}
293	+	}
294	+	}
295	+
296	+	/**
297	+	* Multiple threads using same array of counters successfully
298	+	* update a number of times equal to total count
299	+	*/
300	+	public void testCountingInMultipleThreads() throws InterruptedException {
301	+	final AtomicLongArray aa = new AtomicLongArray(SIZE);
302	+	long countdown = 10000;
303	+	for (int i = 0; i < SIZE; i++)
304	+	aa.set(i, countdown);
305	+	Counter c1 = new Counter(aa);
306	+	Counter c2 = new Counter(aa);
307	+	Thread t1 = new Thread(c1);
308	+	Thread t2 = new Thread(c2);
309	+	t1.start();
310	+	t2.start();
311	+	t1.join();
312	+	t2.join();
313	+	assertEquals(c1.counts+c2.counts, SIZE * countdown);
314	+	}
315	+
316	+	/**
317	+	* a deserialized serialized array holds same values
318	+	*/
319	+	public void testSerialization() throws Exception {
320	+	AtomicLongArray x = new AtomicLongArray(SIZE);
321	+	for (int i = 0; i < SIZE; i++)
322	+	x.set(i, -i);
323	+	AtomicLongArray y = serialClone(x);
324	+	assertNotSame(x, y);
325	+	assertEquals(x.length(), y.length());
326	+	for (int i = 0; i < SIZE; i++) {
327	+	assertEquals(x.get(i), y.get(i));
328	+	}
329	+	}
330	+
331	+	/**
332	+	* toString returns current value.
333	+	*/
334	+	public void testToString() {
335	+	long[] a = { 17, 3, -42, 99, -7 };
336	+	AtomicLongArray aa = new AtomicLongArray(a);
337	+	assertEquals(Arrays.toString(a), aa.toString());
338	+	}
339	+
340		}

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