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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 1.36 by jsr166, Thu Sep 15 01:18:01 2016 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.*;
9	>	import java.util.Arrays;
10	>	import java.util.concurrent.atomic.AtomicLongArray;
11
12	<	public class AtomicLongArrayTest extends TestCase
13	<	{
13	<	static final int N = 10;
12	>	import junit.framework.Test;
13	>	import junit.framework.TestSuite;
14
15	<	public static void main (String[] args) {
16	<	junit.textui.TestRunner.run (suite());
15	>	public class AtomicLongArrayTest extends JSR166TestCase {
16	>	public static void main(String[] args) {
17	>	main(suite(), args);
18		}
19		public static Test suite() {
20		return new TestSuite(AtomicLongArrayTest.class);
21		}
22
23	<	public void testConstructor(){
24	<	AtomicLongArray ai = new AtomicLongArray(N);
25	<	for (int i = 0; i < N; ++i)
26	<	assertEquals(0,ai.get(i));
27	<	}
28	<
29	<	public void testGetSet(){
30	<	AtomicLongArray ai = new AtomicLongArray(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	<	AtomicLongArray ai = new AtomicLongArray(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	<	AtomicLongArray ai = new AtomicLongArray(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	<	AtomicLongArray ai = new AtomicLongArray(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	<	AtomicLongArray ai = new AtomicLongArray(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	<
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));
23	>	/**
24	>	* constructor creates array of given size with all elements zero
25	>	*/
26	>	public void testConstructor() {
27	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
28	>	for (int i = 0; i < SIZE; i++)
29	>	assertEquals(0, aa.get(i));
30	>	}
31	>
32	>	/**
33	>	* constructor with null array throws NPE
34	>	*/
35	>	public void testConstructor2NPE() {
36	>	try {
37	>	long[] a = null;
38	>	new AtomicLongArray(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	>	long[] a = { 17L, 3L, -42L, 99L, -7L };
48	>	AtomicLongArray aa = new AtomicLongArray(a);
49	>	assertEquals(a.length, aa.length());
50	>	for (int i = 0; i < a.length; i++)
51	>	assertEquals(a[i], aa.get(i));
52	>	}
53	>
54	>	/**
55	>	* get and set for out of bound indices throw IndexOutOfBoundsException
56	>	*/
57	>	public void testIndexing() {
58	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
59	>	for (int index : new int[] { -1, SIZE }) {
60	>	try {
61	>	aa.get(index);
62	>	shouldThrow();
63	>	} catch (IndexOutOfBoundsException success) {}
64	>	try {
65	>	aa.set(index, 1);
66	>	shouldThrow();
67	>	} catch (IndexOutOfBoundsException success) {}
68	>	try {
69	>	aa.lazySet(index, 1);
70	>	shouldThrow();
71	>	} catch (IndexOutOfBoundsException success) {}
72	>	try {
73	>	aa.compareAndSet(index, 1, 2);
74	>	shouldThrow();
75	>	} catch (IndexOutOfBoundsException success) {}
76	>	try {
77	>	aa.weakCompareAndSet(index, 1, 2);
78	>	shouldThrow();
79	>	} catch (IndexOutOfBoundsException success) {}
80	>	try {
81	>	aa.getAndAdd(index, 1);
82	>	shouldThrow();
83	>	} catch (IndexOutOfBoundsException success) {}
84	>	try {
85	>	aa.addAndGet(index, 1);
86	>	shouldThrow();
87	>	} catch (IndexOutOfBoundsException success) {}
88		}
89		}
90
91	+	/**
92	+	* get returns the last value set at index
93	+	*/
94	+	public void testGetSet() {
95	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
96	+	for (int i = 0; i < SIZE; i++) {
97	+	aa.set(i, 1);
98	+	assertEquals(1, aa.get(i));
99	+	aa.set(i, 2);
100	+	assertEquals(2, aa.get(i));
101	+	aa.set(i, -3);
102	+	assertEquals(-3, aa.get(i));
103	+	}
104	+	}
105	+
106	+	/**
107	+	* get returns the last value lazySet at index by same thread
108	+	*/
109	+	public void testGetLazySet() {
110	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
111	+	for (int i = 0; i < SIZE; i++) {
112	+	aa.lazySet(i, 1);
113	+	assertEquals(1, aa.get(i));
114	+	aa.lazySet(i, 2);
115	+	assertEquals(2, aa.get(i));
116	+	aa.lazySet(i, -3);
117	+	assertEquals(-3, aa.get(i));
118	+	}
119	+	}
120	+
121	+	/**
122	+	* compareAndSet succeeds in changing value if equal to expected else fails
123	+	*/
124	+	public void testCompareAndSet() {
125	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
126	+	for (int i = 0; i < SIZE; i++) {
127	+	aa.set(i, 1);
128	+	assertTrue(aa.compareAndSet(i, 1, 2));
129	+	assertTrue(aa.compareAndSet(i, 2, -4));
130	+	assertEquals(-4, aa.get(i));
131	+	assertFalse(aa.compareAndSet(i, -5, 7));
132	+	assertEquals(-4, aa.get(i));
133	+	assertTrue(aa.compareAndSet(i, -4, 7));
134	+	assertEquals(7, aa.get(i));
135	+	}
136	+	}
137	+
138	+	/**
139	+	* compareAndSet in one thread enables another waiting for value
140	+	* to succeed
141	+	*/
142	+	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
143	+	final AtomicLongArray a = new AtomicLongArray(1);
144	+	a.set(0, 1);
145	+	Thread t = new Thread(new CheckedRunnable() {
146	+	public void realRun() {
147	+	while (!a.compareAndSet(0, 2, 3))
148	+	Thread.yield();
149	+	}});
150	+
151	+	t.start();
152	+	assertTrue(a.compareAndSet(0, 1, 2));
153	+	t.join(LONG_DELAY_MS);
154	+	assertFalse(t.isAlive());
155	+	assertEquals(3, a.get(0));
156	+	}
157	+
158	+	/**
159	+	* repeated weakCompareAndSet succeeds in changing value when equal
160	+	* to expected
161	+	*/
162	+	public void testWeakCompareAndSet() {
163	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
164	+	for (int i = 0; i < SIZE; i++) {
165	+	aa.set(i, 1);
166	+	do {} while (!aa.weakCompareAndSet(i, 1, 2));
167	+	do {} while (!aa.weakCompareAndSet(i, 2, -4));
168	+	assertEquals(-4, aa.get(i));
169	+	do {} while (!aa.weakCompareAndSet(i, -4, 7));
170	+	assertEquals(7, aa.get(i));
171	+	}
172	+	}
173	+
174	+	/**
175	+	* getAndSet returns previous value and sets to given value at given index
176	+	*/
177	+	public void testGetAndSet() {
178	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
179	+	for (int i = 0; i < SIZE; i++) {
180	+	aa.set(i, 1);
181	+	assertEquals(1, aa.getAndSet(i, 0));
182	+	assertEquals(0, aa.getAndSet(i, -10));
183	+	assertEquals(-10, aa.getAndSet(i, 1));
184	+	}
185	+	}
186	+
187	+	/**
188	+	* getAndAdd returns previous value and adds given value
189	+	*/
190	+	public void testGetAndAdd() {
191	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
192	+	for (int i = 0; i < SIZE; i++) {
193	+	aa.set(i, 1);
194	+	assertEquals(1, aa.getAndAdd(i, 2));
195	+	assertEquals(3, aa.get(i));
196	+	assertEquals(3, aa.getAndAdd(i, -4));
197	+	assertEquals(-1, aa.get(i));
198	+	}
199	+	}
200	+
201	+	/**
202	+	* getAndDecrement returns previous value and decrements
203	+	*/
204	+	public void testGetAndDecrement() {
205	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
206	+	for (int i = 0; i < SIZE; i++) {
207	+	aa.set(i, 1);
208	+	assertEquals(1, aa.getAndDecrement(i));
209	+	assertEquals(0, aa.getAndDecrement(i));
210	+	assertEquals(-1, aa.getAndDecrement(i));
211	+	}
212	+	}
213	+
214	+	/**
215	+	* getAndIncrement returns previous value and increments
216	+	*/
217	+	public void testGetAndIncrement() {
218	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
219	+	for (int i = 0; i < SIZE; i++) {
220	+	aa.set(i, 1);
221	+	assertEquals(1, aa.getAndIncrement(i));
222	+	assertEquals(2, aa.get(i));
223	+	aa.set(i, -2);
224	+	assertEquals(-2, aa.getAndIncrement(i));
225	+	assertEquals(-1, aa.getAndIncrement(i));
226	+	assertEquals(0, aa.getAndIncrement(i));
227	+	assertEquals(1, aa.get(i));
228	+	}
229	+	}
230	+
231	+	/**
232	+	* addAndGet adds given value to current, and returns current value
233	+	*/
234		public void testAddAndGet() {
235	<	AtomicLongArray ai = new AtomicLongArray(N);
236	<	for (int i = 0; i < N; ++i) {
237	<	ai.set(i, 1);
238	<	assertEquals(3,ai.addAndGet(i,2));
239	<	assertEquals(3,ai.get(i));
240	<	assertEquals(-1,ai.addAndGet(i,-4));
241	<	assertEquals(-1,ai.get(i));
235	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
236	>	for (int i = 0; i < SIZE; i++) {
237	>	aa.set(i, 1);
238	>	assertEquals(3, aa.addAndGet(i, 2));
239	>	assertEquals(3, aa.get(i));
240	>	assertEquals(-1, aa.addAndGet(i, -4));
241	>	assertEquals(-1, aa.get(i));
242		}
243		}
244
245	<	public void testDecrementAndGet(){
246	<	AtomicLongArray ai = new AtomicLongArray(N);
247	<	for (int i = 0; i < N; ++i) {
248	<	ai.set(i, 1);
249	<	assertEquals(0,ai.decrementAndGet(i));
250	<	assertEquals(-1,ai.decrementAndGet(i));
251	<	assertEquals(-2,ai.decrementAndGet(i));
252	<	assertEquals(-2,ai.get(i));
245	>	/**
246	>	* decrementAndGet decrements and returns current value
247	>	*/
248	>	public void testDecrementAndGet() {
249	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
250	>	for (int i = 0; i < SIZE; i++) {
251	>	aa.set(i, 1);
252	>	assertEquals(0, aa.decrementAndGet(i));
253	>	assertEquals(-1, aa.decrementAndGet(i));
254	>	assertEquals(-2, aa.decrementAndGet(i));
255	>	assertEquals(-2, aa.get(i));
256		}
257		}
258
259	+	/**
260	+	* incrementAndGet increments and returns current value
261	+	*/
262		public void testIncrementAndGet() {
263	<	AtomicLongArray ai = new AtomicLongArray(N);
264	<	for (int i = 0; i < N; ++i) {
265	<	ai.set(i, 1);
266	<	assertEquals(2,ai.incrementAndGet(i));
267	<	assertEquals(2,ai.get(i));
268	<	ai.set(i, -2);
269	<	assertEquals(-1,ai.incrementAndGet(i));
270	<	assertEquals(0,ai.incrementAndGet(i));
271	<	assertEquals(1,ai.incrementAndGet(i));
272	<	assertEquals(1,ai.get(i));
263	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
264	>	for (int i = 0; i < SIZE; i++) {
265	>	aa.set(i, 1);
266	>	assertEquals(2, aa.incrementAndGet(i));
267	>	assertEquals(2, aa.get(i));
268	>	aa.set(i, -2);
269	>	assertEquals(-1, aa.incrementAndGet(i));
270	>	assertEquals(0, aa.incrementAndGet(i));
271	>	assertEquals(1, aa.incrementAndGet(i));
272	>	assertEquals(1, aa.get(i));
273		}
274		}
275
276	+	class Counter extends CheckedRunnable {
277	+	final AtomicLongArray aa;
278	+	int decs;
279	+	Counter(AtomicLongArray a) { aa = a; }
280	+	public void realRun() {
281	+	for (;;) {
282	+	boolean done = true;
283	+	for (int i = 0; i < aa.length(); i++) {
284	+	long v = aa.get(i);
285	+	assertTrue(v >= 0);
286	+	if (v != 0) {
287	+	done = false;
288	+	if (aa.compareAndSet(i, v, v - 1))
289	+	decs++;
290	+	}
291	+	}
292	+	if (done)
293	+	break;
294	+	}
295	+	}
296	+	}
297	+
298	+	/**
299	+	* Multiple threads using same array of counters successfully
300	+	* update a number of times equal to total count
301	+	*/
302	+	public void testCountingInMultipleThreads() throws InterruptedException {
303	+	final AtomicLongArray aa = new AtomicLongArray(SIZE);
304	+	long countdown = 10000;
305	+	for (int i = 0; i < SIZE; i++)
306	+	aa.set(i, countdown);
307	+	Counter c1 = new Counter(aa);
308	+	Counter c2 = new Counter(aa);
309	+	Thread t1 = newStartedThread(c1);
310	+	Thread t2 = newStartedThread(c2);
311	+	t1.join();
312	+	t2.join();
313	+	assertEquals(c1.decs + c2.decs, 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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