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

Comparing jsr166/src/test/tck/AtomicLongArrayTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 2003 UTC vs.
Revision 1.38 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 AtomicLongArrayTest extends TestCase
13	<	{
14	<	static final int N = 10;
9	>	import java.util.Arrays;
10	>	import java.util.concurrent.atomic.AtomicLongArray;
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 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	<
88	<	public void testGetAndDecrement(){
89	<	AtomicLongArray ai = new AtomicLongArray(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	<	AtomicLongArray ai = new AtomicLongArray(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	<	}
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	+	@SuppressWarnings("deprecation")
58	+	public void testIndexing() {
59	+	AtomicLongArray aa = new AtomicLongArray(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	+	AtomicLongArray aa = new AtomicLongArray(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	+	AtomicLongArray aa = new AtomicLongArray(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	+	AtomicLongArray aa = new AtomicLongArray(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 InterruptedException {
144	+	final AtomicLongArray a = new AtomicLongArray(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	+	@SuppressWarnings("deprecation")
164	+	public void testWeakCompareAndSet() {
165	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
166	+	for (int i = 0; i < SIZE; i++) {
167	+	aa.set(i, 1);
168	+	do {} while (!aa.weakCompareAndSet(i, 1, 2));
169	+	do {} while (!aa.weakCompareAndSet(i, 2, -4));
170	+	assertEquals(-4, aa.get(i));
171	+	do {} while (!aa.weakCompareAndSet(i, -4, 7));
172	+	assertEquals(7, aa.get(i));
173	+	}
174	+	}
175	+
176	+	/**
177	+	* getAndSet returns previous value and sets to given value at given index
178	+	*/
179	+	public void testGetAndSet() {
180	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
181	+	for (int i = 0; i < SIZE; i++) {
182	+	aa.set(i, 1);
183	+	assertEquals(1, aa.getAndSet(i, 0));
184	+	assertEquals(0, aa.getAndSet(i, -10));
185	+	assertEquals(-10, aa.getAndSet(i, 1));
186	+	}
187	+	}
188	+
189	+	/**
190	+	* getAndAdd returns previous value and adds given value
191	+	*/
192	+	public void testGetAndAdd() {
193	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
194	+	for (int i = 0; i < SIZE; i++) {
195	+	aa.set(i, 1);
196	+	assertEquals(1, aa.getAndAdd(i, 2));
197	+	assertEquals(3, aa.get(i));
198	+	assertEquals(3, aa.getAndAdd(i, -4));
199	+	assertEquals(-1, aa.get(i));
200	+	}
201	+	}
202	+
203	+	/**
204	+	* getAndDecrement returns previous value and decrements
205	+	*/
206	+	public void testGetAndDecrement() {
207	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
208	+	for (int i = 0; i < SIZE; i++) {
209	+	aa.set(i, 1);
210	+	assertEquals(1, aa.getAndDecrement(i));
211	+	assertEquals(0, aa.getAndDecrement(i));
212	+	assertEquals(-1, aa.getAndDecrement(i));
213	+	}
214	+	}
215	+
216	+	/**
217	+	* getAndIncrement returns previous value and increments
218	+	*/
219	+	public void testGetAndIncrement() {
220	+	AtomicLongArray aa = new AtomicLongArray(SIZE);
221	+	for (int i = 0; i < SIZE; i++) {
222	+	aa.set(i, 1);
223	+	assertEquals(1, aa.getAndIncrement(i));
224	+	assertEquals(2, aa.get(i));
225	+	aa.set(i, -2);
226	+	assertEquals(-2, aa.getAndIncrement(i));
227	+	assertEquals(-1, aa.getAndIncrement(i));
228	+	assertEquals(0, aa.getAndIncrement(i));
229	+	assertEquals(1, aa.get(i));
230	+	}
231	+	}
232	+
233	+	/**
234	+	* addAndGet adds given value to current, and returns current value
235	+	*/
236		public void testAddAndGet() {
237	<	AtomicLongArray ai = new AtomicLongArray(N);
238	<	for (int i = 0; i < N; ++i) {
239	<	ai.set(i, 1);
240	<	assertEquals(3,ai.addAndGet(i,2));
241	<	assertEquals(3,ai.get(i));
242	<	assertEquals(-1,ai.addAndGet(i,-4));
243	<	assertEquals(-1,ai.get(i));
237	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
238	>	for (int i = 0; i < SIZE; i++) {
239	>	aa.set(i, 1);
240	>	assertEquals(3, aa.addAndGet(i, 2));
241	>	assertEquals(3, aa.get(i));
242	>	assertEquals(-1, aa.addAndGet(i, -4));
243	>	assertEquals(-1, aa.get(i));
244		}
245		}
246
247	<	public void testDecrementAndGet(){
248	<	AtomicLongArray ai = new AtomicLongArray(N);
249	<	for (int i = 0; i < N; ++i) {
250	<	ai.set(i, 1);
251	<	assertEquals(0,ai.decrementAndGet(i));
252	<	assertEquals(-1,ai.decrementAndGet(i));
253	<	assertEquals(-2,ai.decrementAndGet(i));
254	<	assertEquals(-2,ai.get(i));
247	>	/**
248	>	* decrementAndGet decrements and returns current value
249	>	*/
250	>	public void testDecrementAndGet() {
251	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
252	>	for (int i = 0; i < SIZE; i++) {
253	>	aa.set(i, 1);
254	>	assertEquals(0, aa.decrementAndGet(i));
255	>	assertEquals(-1, aa.decrementAndGet(i));
256	>	assertEquals(-2, aa.decrementAndGet(i));
257	>	assertEquals(-2, aa.get(i));
258		}
259		}
260
261	+	/**
262	+	* incrementAndGet increments and returns current value
263	+	*/
264		public void testIncrementAndGet() {
265	<	AtomicLongArray ai = new AtomicLongArray(N);
266	<	for (int i = 0; i < N; ++i) {
267	<	ai.set(i, 1);
268	<	assertEquals(2,ai.incrementAndGet(i));
269	<	assertEquals(2,ai.get(i));
270	<	ai.set(i, -2);
271	<	assertEquals(-1,ai.incrementAndGet(i));
272	<	assertEquals(0,ai.incrementAndGet(i));
273	<	assertEquals(1,ai.incrementAndGet(i));
274	<	assertEquals(1,ai.get(i));
265	>	AtomicLongArray aa = new AtomicLongArray(SIZE);
266	>	for (int i = 0; i < SIZE; i++) {
267	>	aa.set(i, 1);
268	>	assertEquals(2, aa.incrementAndGet(i));
269	>	assertEquals(2, aa.get(i));
270	>	aa.set(i, -2);
271	>	assertEquals(-1, aa.incrementAndGet(i));
272	>	assertEquals(0, aa.incrementAndGet(i));
273	>	assertEquals(1, aa.incrementAndGet(i));
274	>	assertEquals(1, aa.get(i));
275		}
276		}
277
278	<	public void testSerialization() {
279	<	AtomicLongArray l = new AtomicLongArray(N);
280	<	for (int i = 0; i < N; ++i)
281	<	l.set(i, -i);
282	<
283	<	try {
284	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
285	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
286	<	out.writeObject(l);
287	<	out.close();
288	<
289	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
290	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
291	<	AtomicLongArray r = (AtomicLongArray) in.readObject();
292	<	for (int i = 0; i < N; ++i) {
293	<	assertEquals(l.get(i), r.get(i));
278	>	class Counter extends CheckedRunnable {
279	>	final AtomicLongArray aa;
280	>	int decs;
281	>	Counter(AtomicLongArray a) { aa = a; }
282	>	public void realRun() {
283	>	for (;;) {
284	>	boolean done = true;
285	>	for (int i = 0; i < aa.length(); i++) {
286	>	long v = aa.get(i);
287	>	assertTrue(v >= 0);
288	>	if (v != 0) {
289	>	done = false;
290	>	if (aa.compareAndSet(i, v, v - 1))
291	>	decs++;
292	>	}
293	>	}
294	>	if (done)
295	>	break;
296		}
165	–	} catch(Exception e){
166	–	e.printStackTrace();
167	–	fail("unexpected exception");
297		}
298		}
299
300	+	/**
301	+	* Multiple threads using same array of counters successfully
302	+	* update a number of times equal to total count
303	+	*/
304	+	public void testCountingInMultipleThreads() throws InterruptedException {
305	+	final AtomicLongArray aa = new AtomicLongArray(SIZE);
306	+	long countdown = 10000;
307	+	for (int i = 0; i < SIZE; i++)
308	+	aa.set(i, countdown);
309	+	Counter c1 = new Counter(aa);
310	+	Counter c2 = new Counter(aa);
311	+	Thread t1 = newStartedThread(c1);
312	+	Thread t2 = newStartedThread(c2);
313	+	t1.join();
314	+	t2.join();
315	+	assertEquals(c1.decs + c2.decs, SIZE * countdown);
316	+	}
317	+
318	+	/**
319	+	* a deserialized/reserialized array holds same values in same order
320	+	*/
321	+	public void testSerialization() throws Exception {
322	+	AtomicLongArray x = new AtomicLongArray(SIZE);
323	+	for (int i = 0; i < SIZE; i++)
324	+	x.set(i, -i);
325	+	AtomicLongArray y = serialClone(x);
326	+	assertNotSame(x, y);
327	+	assertEquals(x.length(), y.length());
328	+	for (int i = 0; i < SIZE; i++) {
329	+	assertEquals(x.get(i), y.get(i));
330	+	}
331	+	}
332	+
333	+	/**
334	+	* toString returns current value.
335	+	*/
336	+	public void testToString() {
337	+	long[] a = { 17, 3, -42, 99, -7 };
338	+	AtomicLongArray aa = new AtomicLongArray(a);
339	+	assertEquals(Arrays.toString(a), aa.toString());
340	+	}
341
342		}

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