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

Comparing jsr166/src/test/tck/AtomicLongArrayTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.13 by jsr166, Tue Nov 17 02:48:16 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 JSR166TestCase {
15		public static void main (String[] args) {
#	Line 17 | Line 19 | public class AtomicLongArrayTest extends
19		return new TestSuite(AtomicLongArrayTest.class);
20		}
21
22	<	public void testConstructor(){
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)
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(SIZE);
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));
#	Line 35 | Line 92 | public class AtomicLongArrayTest extends
92		}
93		}
94
95	<	public void testCompareAndSet(){
96	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
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));
#	Line 49 | Line 124 | public class AtomicLongArrayTest extends
124		}
125		}
126
127	<	public void testWeakCompareAndSet(){
128	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
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 Runnable() {
135	>	public void run() {
136	>	while (!a.compareAndSet(0, 2, 3)) Thread.yield();
137	>	}});
138	>
139	>	t.start();
140	>	assertTrue(a.compareAndSet(0, 1, 2));
141	>	t.join(LONG_DELAY_MS);
142	>	assertFalse(t.isAlive());
143	>	assertEquals(a.get(0), 3);
144	>	}
145	>
146	>	/**
147	>	* repeated weakCompareAndSet succeeds in changing value when equal
148	>	* to expected
149	>	*/
150	>	public void testWeakCompareAndSet() {
151	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
152		for (int i = 0; i < SIZE; ++i) {
153		ai.set(i, 1);
154	<	while(!ai.weakCompareAndSet(i, 1,2));
155	<	while(!ai.weakCompareAndSet(i, 2,-4));
154	>	while (!ai.weakCompareAndSet(i, 1,2));
155	>	while (!ai.weakCompareAndSet(i, 2,-4));
156		assertEquals(-4,ai.get(i));
157	<	while(!ai.weakCompareAndSet(i, -4,7));
157	>	while (!ai.weakCompareAndSet(i, -4,7));
158		assertEquals(7,ai.get(i));
159		}
160		}
161
162	<	public void testGetAndSet(){
163	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
162	>	/**
163	>	*  getAndSet returns previous value and sets to given value at given index
164	>	*/
165	>	public void testGetAndSet() {
166	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
167		for (int i = 0; i < SIZE; ++i) {
168		ai.set(i, 1);
169		assertEquals(1,ai.getAndSet(i,0));
#	Line 71 | Line 172 | public class AtomicLongArrayTest extends
172		}
173		}
174
175	<	public void testGetAndAdd(){
176	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
175	>	/**
176	>	*  getAndAdd returns previous value and adds given value
177	>	*/
178	>	public void testGetAndAdd() {
179	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
180		for (int i = 0; i < SIZE; ++i) {
181		ai.set(i, 1);
182		assertEquals(1,ai.getAndAdd(i,2));
#	Line 82 | Line 186 | public class AtomicLongArrayTest extends
186		}
187		}
188
189	<	public void testGetAndDecrement(){
190	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
189	>	/**
190	>	* getAndDecrement returns previous value and decrements
191	>	*/
192	>	public void testGetAndDecrement() {
193	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
194		for (int i = 0; i < SIZE; ++i) {
195		ai.set(i, 1);
196		assertEquals(1,ai.getAndDecrement(i));
#	Line 92 | Line 199 | public class AtomicLongArrayTest extends
199		}
200		}
201
202	<	public void testGetAndIncrement(){
203	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
202	>	/**
203	>	* getAndIncrement returns previous value and increments
204	>	*/
205	>	public void testGetAndIncrement() {
206	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
207		for (int i = 0; i < SIZE; ++i) {
208		ai.set(i, 1);
209		assertEquals(1,ai.getAndIncrement(i));
#	Line 106 | Line 216 | public class AtomicLongArrayTest extends
216		}
217		}
218
219	+	/**
220	+	*  addAndGet adds given value to current, and returns current value
221	+	*/
222		public void testAddAndGet() {
223	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
223	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
224		for (int i = 0; i < SIZE; ++i) {
225		ai.set(i, 1);
226		assertEquals(3,ai.addAndGet(i,2));
#	Line 117 | Line 230 | public class AtomicLongArrayTest extends
230		}
231		}
232
233	<	public void testDecrementAndGet(){
234	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
233	>	/**
234	>	* decrementAndGet decrements and returns current value
235	>	*/
236	>	public void testDecrementAndGet() {
237	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
238		for (int i = 0; i < SIZE; ++i) {
239		ai.set(i, 1);
240		assertEquals(0,ai.decrementAndGet(i));
#	Line 128 | Line 244 | public class AtomicLongArrayTest extends
244		}
245		}
246
247	+	/**
248	+	* incrementAndGet increments and returns current value
249	+	*/
250		public void testIncrementAndGet() {
251	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
251	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
252		for (int i = 0; i < SIZE; ++i) {
253		ai.set(i, 1);
254		assertEquals(2,ai.incrementAndGet(i));
#	Line 143 | Line 262 | public class AtomicLongArrayTest extends
262		}
263
264		static final long COUNTDOWN = 100000;
265	<
265	>
266		class Counter implements Runnable {
267		final AtomicLongArray ai;
268		volatile long counts;
#	Line 166 | Line 285 | public class AtomicLongArrayTest extends
285		}
286		}
287
288	<	public void testCountingInMultipleThreads() {
289	<	try {
290	<	final AtomicLongArray ai = new AtomicLongArray(SIZE);
291	<	for (int i = 0; i < SIZE; ++i)
292	<	ai.set(i, COUNTDOWN);
293	<	Counter c1 = new Counter(ai);
294	<	Counter c2 = new Counter(ai);
295	<	Thread t1 = new Thread(c1);
296	<	Thread t2 = new Thread(c2);
297	<	t1.start();
298	<	t2.start();
299	<	t1.join();
300	<	t2.join();
301	<	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
302	<	}
303	<	catch(InterruptedException ie) {
304	<	fail("unexpected exception");
305	<	}
306	<	}
307	<
308	<	public void testSerialization() {
309	<	AtomicLongArray l = new AtomicLongArray(SIZE);
310	<	for (int i = 0; i < SIZE; ++i)
288	>	/**
289	>	* Multiple threads using same array of counters successfully
290	>	* update a number of times equal to total count
291	>	*/
292	>	public void testCountingInMultipleThreads() throws InterruptedException {
293	>	final AtomicLongArray ai = new AtomicLongArray(SIZE);
294	>	for (int i = 0; i < SIZE; ++i)
295	>	ai.set(i, COUNTDOWN);
296	>	Counter c1 = new Counter(ai);
297	>	Counter c2 = new Counter(ai);
298	>	Thread t1 = new Thread(c1);
299	>	Thread t2 = new Thread(c2);
300	>	t1.start();
301	>	t2.start();
302	>	t1.join();
303	>	t2.join();
304	>	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
305	>	}
306	>
307	>	/**
308	>	* a deserialized serialized array holds same values
309	>	*/
310	>	public void testSerialization() throws Exception {
311	>	AtomicLongArray l = new AtomicLongArray(SIZE);
312	>	for (int i = 0; i < SIZE; ++i)
313		l.set(i, -i);
314
315	<	try {
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) {
204	<	assertEquals(l.get(i), r.get(i));
205	<	}
206	<	} catch(Exception e){
207	<	e.printStackTrace();
208	<	fail("unexpected exception");
315	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
316	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
317	>	out.writeObject(l);
318	>	out.close();
319	>
320	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
321	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
322	>	AtomicLongArray r = (AtomicLongArray) in.readObject();
323	>	for (int i = 0; i < SIZE; ++i) {
324	>	assertEquals(l.get(i), r.get(i));
325		}
326		}
327
328	+	/**
329	+	* toString returns current value.
330	+	*/
331	+	public void testToString() {
332	+	long[] a = { 17, 3, -42, 99, -7};
333	+	AtomicLongArray ai = new AtomicLongArray(a);
334	+	assertEquals(Arrays.toString(a), ai.toString());
335	+	}
336	+
337
338		}

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