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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 1.12 by jsr166, Mon Nov 16 05:30:07 2009 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/licenses/publicdomain
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
12	<	{
13	<	static final int N = 10;
14	<
14	>	public class AtomicLongArrayTest extends JSR166TestCase {
15		public static void main (String[] args) {
16		junit.textui.TestRunner.run (suite());
17		}
#	Line 19 | Line 19 | public class AtomicLongArrayTest extends
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	>	} catch (NullPointerException success) {
39	>	} catch (Exception ex) {
40	>	unexpectedException();
41	>	}
42	>	}
43	>
44	>	/**
45	>	* constructor with array is of same size and has all elements
46	>	*/
47	>	public void testConstructor2() {
48	>	long[] a = { 17L, 3L, -42L, 99L, -7L};
49	>	AtomicLongArray ai = new AtomicLongArray(a);
50	>	assertEquals(a.length, ai.length());
51	>	for (int i = 0; i < a.length; ++i)
52	>	assertEquals(a[i], ai.get(i));
53	>	}
54	>
55	>	/**
56	>	* get and set for out of bound indices throw IndexOutOfBoundsException
57	>	*/
58	>	public void testIndexing() {
59	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
60	>	try {
61	>	ai.get(SIZE);
62	>	} catch (IndexOutOfBoundsException success) {
63	>	}
64	>	try {
65	>	ai.get(-1);
66	>	} catch (IndexOutOfBoundsException success) {
67	>	}
68	>	try {
69	>	ai.set(SIZE, 0);
70	>	} catch (IndexOutOfBoundsException success) {
71	>	}
72	>	try {
73	>	ai.set(-1, 0);
74	>	} catch (IndexOutOfBoundsException success) {
75	>	}
76	>	}
77	>
78	>	/**
79	>	* get returns the last value set at index
80	>	*/
81	>	public void testGetSet() {
82	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
83	>	for (int i = 0; i < SIZE; ++i) {
84		ai.set(i, 1);
85		assertEquals(1,ai.get(i));
86		ai.set(i, 2);
#	Line 37 | Line 90 | public class AtomicLongArrayTest extends
90		}
91		}
92
93	<	public void testCompareAndSet(){
94	<	AtomicLongArray ai = new AtomicLongArray(N);
95	<	for (int i = 0; i < N; ++i) {
93	>	/**
94	>	* get returns the last value lazySet at index by same thread
95	>	*/
96	>	public void testGetLazySet() {
97	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
98	>	for (int i = 0; i < SIZE; ++i) {
99	>	ai.lazySet(i, 1);
100	>	assertEquals(1,ai.get(i));
101	>	ai.lazySet(i, 2);
102	>	assertEquals(2,ai.get(i));
103	>	ai.lazySet(i, -3);
104	>	assertEquals(-3,ai.get(i));
105	>	}
106	>	}
107	>
108	>	/**
109	>	* compareAndSet succeeds in changing value if equal to expected else fails
110	>	*/
111	>	public void testCompareAndSet() {
112	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
113	>	for (int i = 0; i < SIZE; ++i) {
114		ai.set(i, 1);
115		assertTrue(ai.compareAndSet(i, 1,2));
116		assertTrue(ai.compareAndSet(i, 2,-4));
#	Line 51 | Line 122 | public class AtomicLongArrayTest extends
122		}
123		}
124
125	<	public void testWeakCompareAndSet(){
126	<	AtomicLongArray ai = new AtomicLongArray(N);
127	<	for (int i = 0; i < N; ++i) {
125	>	/**
126	>	* compareAndSet in one thread enables another waiting for value
127	>	* to succeed
128	>	*/
129	>	public void testCompareAndSetInMultipleThreads() {
130	>	final AtomicLongArray a = new AtomicLongArray(1);
131	>	a.set(0, 1);
132	>	Thread t = new Thread(new Runnable() {
133	>	public void run() {
134	>	while (!a.compareAndSet(0, 2, 3)) Thread.yield();
135	>	}});
136	>	try {
137	>	t.start();
138	>	assertTrue(a.compareAndSet(0, 1, 2));
139	>	t.join(LONG_DELAY_MS);
140	>	assertFalse(t.isAlive());
141	>	assertEquals(a.get(0), 3);
142	>	}
143	>	catch (Exception e) {
144	>	unexpectedException();
145	>	}
146	>	}
147	>
148	>	/**
149	>	* repeated weakCompareAndSet succeeds in changing value when equal
150	>	* to expected
151	>	*/
152	>	public void testWeakCompareAndSet() {
153	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
154	>	for (int i = 0; i < SIZE; ++i) {
155		ai.set(i, 1);
156	<	while(!ai.weakCompareAndSet(i, 1,2));
157	<	while(!ai.weakCompareAndSet(i, 2,-4));
156	>	while (!ai.weakCompareAndSet(i, 1,2));
157	>	while (!ai.weakCompareAndSet(i, 2,-4));
158		assertEquals(-4,ai.get(i));
159	<	while(!ai.weakCompareAndSet(i, -4,7));
159	>	while (!ai.weakCompareAndSet(i, -4,7));
160		assertEquals(7,ai.get(i));
161		}
162		}
163
164	<	public void testGetAndSet(){
165	<	AtomicLongArray ai = new AtomicLongArray(N);
166	<	for (int i = 0; i < N; ++i) {
164	>	/**
165	>	*  getAndSet returns previous value and sets to given value at given index
166	>	*/
167	>	public void testGetAndSet() {
168	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
169	>	for (int i = 0; i < SIZE; ++i) {
170		ai.set(i, 1);
171		assertEquals(1,ai.getAndSet(i,0));
172		assertEquals(0,ai.getAndSet(i,-10));
#	Line 73 | Line 174 | public class AtomicLongArrayTest extends
174		}
175		}
176
177	<	public void testGetAndAdd(){
178	<	AtomicLongArray ai = new AtomicLongArray(N);
179	<	for (int i = 0; i < N; ++i) {
177	>	/**
178	>	*  getAndAdd returns previous value and adds given value
179	>	*/
180	>	public void testGetAndAdd() {
181	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
182	>	for (int i = 0; i < SIZE; ++i) {
183		ai.set(i, 1);
184		assertEquals(1,ai.getAndAdd(i,2));
185		assertEquals(3,ai.get(i));
#	Line 84 | Line 188 | public class AtomicLongArrayTest extends
188		}
189		}
190
191	<	public void testGetAndDecrement(){
192	<	AtomicLongArray ai = new AtomicLongArray(N);
193	<	for (int i = 0; i < N; ++i) {
191	>	/**
192	>	* getAndDecrement returns previous value and decrements
193	>	*/
194	>	public void testGetAndDecrement() {
195	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
196	>	for (int i = 0; i < SIZE; ++i) {
197		ai.set(i, 1);
198		assertEquals(1,ai.getAndDecrement(i));
199		assertEquals(0,ai.getAndDecrement(i));
#	Line 94 | Line 201 | public class AtomicLongArrayTest extends
201		}
202		}
203
204	<	public void testGetAndIncrement(){
205	<	AtomicLongArray ai = new AtomicLongArray(N);
206	<	for (int i = 0; i < N; ++i) {
204	>	/**
205	>	* getAndIncrement returns previous value and increments
206	>	*/
207	>	public void testGetAndIncrement() {
208	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
209	>	for (int i = 0; i < SIZE; ++i) {
210		ai.set(i, 1);
211		assertEquals(1,ai.getAndIncrement(i));
212		assertEquals(2,ai.get(i));
#	Line 108 | Line 218 | public class AtomicLongArrayTest extends
218		}
219		}
220
221	+	/**
222	+	*  addAndGet adds given value to current, and returns current value
223	+	*/
224		public void testAddAndGet() {
225	<	AtomicLongArray ai = new AtomicLongArray(N);
226	<	for (int i = 0; i < N; ++i) {
225	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
226	>	for (int i = 0; i < SIZE; ++i) {
227		ai.set(i, 1);
228		assertEquals(3,ai.addAndGet(i,2));
229		assertEquals(3,ai.get(i));
#	Line 119 | Line 232 | public class AtomicLongArrayTest extends
232		}
233		}
234
235	<	public void testDecrementAndGet(){
236	<	AtomicLongArray ai = new AtomicLongArray(N);
237	<	for (int i = 0; i < N; ++i) {
235	>	/**
236	>	* decrementAndGet decrements and returns current value
237	>	*/
238	>	public void testDecrementAndGet() {
239	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
240	>	for (int i = 0; i < SIZE; ++i) {
241		ai.set(i, 1);
242		assertEquals(0,ai.decrementAndGet(i));
243		assertEquals(-1,ai.decrementAndGet(i));
#	Line 130 | Line 246 | public class AtomicLongArrayTest extends
246		}
247		}
248
249	+	/**
250	+	* incrementAndGet increments and returns current value
251	+	*/
252		public void testIncrementAndGet() {
253	<	AtomicLongArray ai = new AtomicLongArray(N);
254	<	for (int i = 0; i < N; ++i) {
253	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
254	>	for (int i = 0; i < SIZE; ++i) {
255		ai.set(i, 1);
256		assertEquals(2,ai.incrementAndGet(i));
257		assertEquals(2,ai.get(i));
#	Line 144 | Line 263 | public class AtomicLongArrayTest extends
263		}
264		}
265
266	+	static final long COUNTDOWN = 100000;
267	+
268	+	class Counter implements Runnable {
269	+	final AtomicLongArray ai;
270	+	volatile long counts;
271	+	Counter(AtomicLongArray a) { ai = a; }
272	+	public void run() {
273	+	for (;;) {
274	+	boolean done = true;
275	+	for (int i = 0; i < ai.length(); ++i) {
276	+	long v = ai.get(i);
277	+	threadAssertTrue(v >= 0);
278	+	if (v != 0) {
279	+	done = false;
280	+	if (ai.compareAndSet(i, v, v-1))
281	+	++counts;
282	+	}
283	+	}
284	+	if (done)
285	+	break;
286	+	}
287	+	}
288	+	}
289	+
290	+	/**
291	+	* Multiple threads using same array of counters successfully
292	+	* update a number of times equal to total count
293	+	*/
294	+	public void testCountingInMultipleThreads() {
295	+	try {
296	+	final AtomicLongArray ai = new AtomicLongArray(SIZE);
297	+	for (int i = 0; i < SIZE; ++i)
298	+	ai.set(i, COUNTDOWN);
299	+	Counter c1 = new Counter(ai);
300	+	Counter c2 = new Counter(ai);
301	+	Thread t1 = new Thread(c1);
302	+	Thread t2 = new Thread(c2);
303	+	t1.start();
304	+	t2.start();
305	+	t1.join();
306	+	t2.join();
307	+	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
308	+	}
309	+	catch (InterruptedException ie) {
310	+	unexpectedException();
311	+	}
312	+	}
313	+
314	+	/**
315	+	* a deserialized serialized array holds same values
316	+	*/
317	+	public void testSerialization() {
318	+	AtomicLongArray l = new AtomicLongArray(SIZE);
319	+	for (int i = 0; i < SIZE; ++i)
320	+	l.set(i, -i);
321	+
322	+	try {
323	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
324	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
325	+	out.writeObject(l);
326	+	out.close();
327	+
328	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
329	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
330	+	AtomicLongArray r = (AtomicLongArray) in.readObject();
331	+	for (int i = 0; i < SIZE; ++i) {
332	+	assertEquals(l.get(i), r.get(i));
333	+	}
334	+	} catch (Exception e) {
335	+	unexpectedException();
336	+	}
337	+	}
338	+
339	+	/**
340	+	* toString returns current value.
341	+	*/
342	+	public void testToString() {
343	+	long[] a = { 17, 3, -42, 99, -7};
344	+	AtomicLongArray ai = new AtomicLongArray(a);
345	+	assertEquals(Arrays.toString(a), ai.toString());
346	+	}
347	+
348	+
349		}

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