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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 1.19 by jsr166, Tue Mar 15 19:47:06 2011 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.*;
11	+	import java.io.*;
12	+	import java.util.*;
13
14	<	public class AtomicLongArrayTest extends TestCase
15	<	{
16	<	static final int N = 10;
14	<
15	<	public static void main (String[] args) {
16	<	junit.textui.TestRunner.run (suite());
14	>	public class AtomicLongArrayTest extends JSR166TestCase {
15	>	public static void main(String[] args) {
16	>	junit.textui.TestRunner.run(suite());
17		}
18		public static Test suite() {
19		return new TestSuite(AtomicLongArrayTest.class);
20		}
21
22	<	public void testConstructor(){
23	<	AtomicLongArray ai = new AtomicLongArray(N);
24	<	for (int i = 0; i < N; ++i)
22	>	/**
23	>	* constructor creates array of given size with all elements zero
24	>	*/
25	>	public void testConstructor() {
26	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
27	>	for (int i = 0; i < SIZE; ++i)
28		assertEquals(0,ai.get(i));
29		}
30
31	<	public void testGetSet(){
32	<	AtomicLongArray ai = new AtomicLongArray(N);
33	<	for (int i = 0; i < N; ++i) {
31	>	/**
32	>	* constructor with null array throws NPE
33	>	*/
34	>	public void testConstructor2NPE() {
35	>	try {
36	>	long[] a = null;
37	>	AtomicLongArray ai = new AtomicLongArray(a);
38	>	shouldThrow();
39	>	} catch (NullPointerException success) {}
40	>	}
41	>
42	>	/**
43	>	* constructor with array is of same size and has all elements
44	>	*/
45	>	public void testConstructor2() {
46	>	long[] a = { 17L, 3L, -42L, 99L, -7L};
47	>	AtomicLongArray ai = new AtomicLongArray(a);
48	>	assertEquals(a.length, ai.length());
49	>	for (int i = 0; i < a.length; ++i)
50	>	assertEquals(a[i], ai.get(i));
51	>	}
52	>
53	>	/**
54	>	* get and set for out of bound indices throw IndexOutOfBoundsException
55	>	*/
56	>	public void testIndexing() {
57	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
58	>	try {
59	>	ai.get(SIZE);
60	>	shouldThrow();
61	>	} catch (IndexOutOfBoundsException success) {
62	>	}
63	>	try {
64	>	ai.get(-1);
65	>	shouldThrow();
66	>	} catch (IndexOutOfBoundsException success) {
67	>	}
68	>	try {
69	>	ai.set(SIZE, 0);
70	>	shouldThrow();
71	>	} catch (IndexOutOfBoundsException success) {
72	>	}
73	>	try {
74	>	ai.set(-1, 0);
75	>	shouldThrow();
76	>	} catch (IndexOutOfBoundsException success) {
77	>	}
78	>	}
79	>
80	>	/**
81	>	* get returns the last value set at index
82	>	*/
83	>	public void testGetSet() {
84	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
85	>	for (int i = 0; i < SIZE; ++i) {
86		ai.set(i, 1);
87		assertEquals(1,ai.get(i));
88		ai.set(i, 2);
#	Line 37 | Line 92 | public class AtomicLongArrayTest extends
92		}
93		}
94
95	<	public void testCompareAndSet(){
96	<	AtomicLongArray ai = new AtomicLongArray(N);
97	<	for (int i = 0; i < N; ++i) {
95	>	/**
96	>	* get returns the last value lazySet at index by same thread
97	>	*/
98	>	public void testGetLazySet() {
99	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
100	>	for (int i = 0; i < SIZE; ++i) {
101	>	ai.lazySet(i, 1);
102	>	assertEquals(1,ai.get(i));
103	>	ai.lazySet(i, 2);
104	>	assertEquals(2,ai.get(i));
105	>	ai.lazySet(i, -3);
106	>	assertEquals(-3,ai.get(i));
107	>	}
108	>	}
109	>
110	>	/**
111	>	* compareAndSet succeeds in changing value if equal to expected else fails
112	>	*/
113	>	public void testCompareAndSet() {
114	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
115	>	for (int i = 0; i < SIZE; ++i) {
116		ai.set(i, 1);
117		assertTrue(ai.compareAndSet(i, 1,2));
118		assertTrue(ai.compareAndSet(i, 2,-4));
119		assertEquals(-4,ai.get(i));
120		assertFalse(ai.compareAndSet(i, -5,7));
121	<	assertFalse((7 == ai.get(i)));
121	>	assertEquals(-4,ai.get(i));
122		assertTrue(ai.compareAndSet(i, -4,7));
123		assertEquals(7,ai.get(i));
124		}
125		}
126
127	<	public void testWeakCompareAndSet(){
128	<	AtomicLongArray ai = new AtomicLongArray(N);
129	<	for (int i = 0; i < N; ++i) {
127	>	/**
128	>	* compareAndSet in one thread enables another waiting for value
129	>	* to succeed
130	>	*/
131	>	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
132	>	final AtomicLongArray a = new AtomicLongArray(1);
133	>	a.set(0, 1);
134	>	Thread t = new Thread(new CheckedRunnable() {
135	>	public void realRun() {
136	>	while (!a.compareAndSet(0, 2, 3))
137	>	Thread.yield();
138	>	}});
139	>
140	>	t.start();
141	>	assertTrue(a.compareAndSet(0, 1, 2));
142	>	t.join(LONG_DELAY_MS);
143	>	assertFalse(t.isAlive());
144	>	assertEquals(a.get(0), 3);
145	>	}
146	>
147	>	/**
148	>	* repeated weakCompareAndSet succeeds in changing value when equal
149	>	* to expected
150	>	*/
151	>	public void testWeakCompareAndSet() {
152	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
153	>	for (int i = 0; i < SIZE; ++i) {
154		ai.set(i, 1);
155	<	while(!ai.weakCompareAndSet(i, 1,2));
156	<	while(!ai.weakCompareAndSet(i, 2,-4));
155	>	while (!ai.weakCompareAndSet(i, 1,2));
156	>	while (!ai.weakCompareAndSet(i, 2,-4));
157		assertEquals(-4,ai.get(i));
158	<	while(!ai.weakCompareAndSet(i, -4,7));
158	>	while (!ai.weakCompareAndSet(i, -4,7));
159		assertEquals(7,ai.get(i));
160		}
161		}
162
163	<	public void testGetAndSet(){
164	<	AtomicLongArray ai = new AtomicLongArray(N);
165	<	for (int i = 0; i < N; ++i) {
163	>	/**
164	>	* getAndSet returns previous value and sets to given value at given index
165	>	*/
166	>	public void testGetAndSet() {
167	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
168	>	for (int i = 0; i < SIZE; ++i) {
169		ai.set(i, 1);
170		assertEquals(1,ai.getAndSet(i,0));
171		assertEquals(0,ai.getAndSet(i,-10));
#	Line 73 | Line 173 | public class AtomicLongArrayTest extends
173		}
174		}
175
176	<	public void testGetAndAdd(){
177	<	AtomicLongArray ai = new AtomicLongArray(N);
178	<	for (int i = 0; i < N; ++i) {
176	>	/**
177	>	* getAndAdd returns previous value and adds given value
178	>	*/
179	>	public void testGetAndAdd() {
180	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
181	>	for (int i = 0; i < SIZE; ++i) {
182		ai.set(i, 1);
183		assertEquals(1,ai.getAndAdd(i,2));
184		assertEquals(3,ai.get(i));
#	Line 84 | Line 187 | public class AtomicLongArrayTest extends
187		}
188		}
189
190	<	public void testGetAndDecrement(){
191	<	AtomicLongArray ai = new AtomicLongArray(N);
192	<	for (int i = 0; i < N; ++i) {
190	>	/**
191	>	* getAndDecrement returns previous value and decrements
192	>	*/
193	>	public void testGetAndDecrement() {
194	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
195	>	for (int i = 0; i < SIZE; ++i) {
196		ai.set(i, 1);
197		assertEquals(1,ai.getAndDecrement(i));
198		assertEquals(0,ai.getAndDecrement(i));
#	Line 94 | Line 200 | public class AtomicLongArrayTest extends
200		}
201		}
202
203	<	public void testGetAndIncrement(){
204	<	AtomicLongArray ai = new AtomicLongArray(N);
205	<	for (int i = 0; i < N; ++i) {
203	>	/**
204	>	* getAndIncrement returns previous value and increments
205	>	*/
206	>	public void testGetAndIncrement() {
207	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
208	>	for (int i = 0; i < SIZE; ++i) {
209		ai.set(i, 1);
210		assertEquals(1,ai.getAndIncrement(i));
211		assertEquals(2,ai.get(i));
#	Line 108 | Line 217 | public class AtomicLongArrayTest extends
217		}
218		}
219
220	+	/**
221	+	* addAndGet adds given value to current, and returns current value
222	+	*/
223		public void testAddAndGet() {
224	<	AtomicLongArray ai = new AtomicLongArray(N);
225	<	for (int i = 0; i < N; ++i) {
224	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
225	>	for (int i = 0; i < SIZE; ++i) {
226		ai.set(i, 1);
227		assertEquals(3,ai.addAndGet(i,2));
228		assertEquals(3,ai.get(i));
#	Line 119 | Line 231 | public class AtomicLongArrayTest extends
231		}
232		}
233
234	<	public void testDecrementAndGet(){
235	<	AtomicLongArray ai = new AtomicLongArray(N);
236	<	for (int i = 0; i < N; ++i) {
234	>	/**
235	>	* decrementAndGet decrements and returns current value
236	>	*/
237	>	public void testDecrementAndGet() {
238	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
239	>	for (int i = 0; i < SIZE; ++i) {
240		ai.set(i, 1);
241		assertEquals(0,ai.decrementAndGet(i));
242		assertEquals(-1,ai.decrementAndGet(i));
#	Line 130 | Line 245 | public class AtomicLongArrayTest extends
245		}
246		}
247
248	+	/**
249	+	* incrementAndGet increments and returns current value
250	+	*/
251		public void testIncrementAndGet() {
252	<	AtomicLongArray ai = new AtomicLongArray(N);
253	<	for (int i = 0; i < N; ++i) {
252	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
253	>	for (int i = 0; i < SIZE; ++i) {
254		ai.set(i, 1);
255		assertEquals(2,ai.incrementAndGet(i));
256		assertEquals(2,ai.get(i));
#	Line 144 | Line 262 | public class AtomicLongArrayTest extends
262		}
263		}
264
265	+	static final long COUNTDOWN = 100000;
266	+
267	+	class Counter extends CheckedRunnable {
268	+	final AtomicLongArray ai;
269	+	volatile long counts;
270	+	Counter(AtomicLongArray a) { ai = a; }
271	+	public void realRun() {
272	+	for (;;) {
273	+	boolean done = true;
274	+	for (int i = 0; i < ai.length(); ++i) {
275	+	long v = ai.get(i);
276	+	assertTrue(v >= 0);
277	+	if (v != 0) {
278	+	done = false;
279	+	if (ai.compareAndSet(i, v, v-1))
280	+	++counts;
281	+	}
282	+	}
283	+	if (done)
284	+	break;
285	+	}
286	+	}
287	+	}
288	+
289	+	/**
290	+	* Multiple threads using same array of counters successfully
291	+	* update a number of times equal to total count
292	+	*/
293	+	public void testCountingInMultipleThreads() throws InterruptedException {
294	+	final AtomicLongArray ai = new AtomicLongArray(SIZE);
295	+	for (int i = 0; i < SIZE; ++i)
296	+	ai.set(i, COUNTDOWN);
297	+	Counter c1 = new Counter(ai);
298	+	Counter c2 = new Counter(ai);
299	+	Thread t1 = new Thread(c1);
300	+	Thread t2 = new Thread(c2);
301	+	t1.start();
302	+	t2.start();
303	+	t1.join();
304	+	t2.join();
305	+	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
306	+	}
307	+
308	+	/**
309	+	* a deserialized serialized array holds same values
310	+	*/
311	+	public void testSerialization() throws Exception {
312	+	AtomicLongArray l = new AtomicLongArray(SIZE);
313	+	for (int i = 0; i < SIZE; ++i)
314	+	l.set(i, -i);
315	+
316	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
317	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
318	+	out.writeObject(l);
319	+	out.close();
320	+
321	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
322	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
323	+	AtomicLongArray r = (AtomicLongArray) in.readObject();
324	+	for (int i = 0; i < SIZE; ++i) {
325	+	assertEquals(l.get(i), r.get(i));
326	+	}
327	+	}
328	+
329	+	/**
330	+	* toString returns current value.
331	+	*/
332	+	public void testToString() {
333	+	long[] a = { 17, 3, -42, 99, -7};
334	+	AtomicLongArray ai = new AtomicLongArray(a);
335	+	assertEquals(Arrays.toString(a), ai.toString());
336	+	}
337	+
338	+
339		}

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