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

Comparing jsr166/src/test/tck/AtomicIntegerArrayTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.14 by jsr166, Tue Nov 17 02:37:16 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 AtomicIntegerArrayTest extends JSR166TestCase {
15
#	Line 19 | Line 21 | public class AtomicIntegerArrayTest exte
21		}
22
23
24	<	public void testConstructor(){
24	>	/**
25	>	* constructor creates array of given size with all elements zero
26	>	*/
27	>	public void testConstructor() {
28		AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
29	<	for (int i = 0; i < SIZE; ++i)
29	>	for (int i = 0; i < SIZE; ++i)
30		assertEquals(0,ai.get(i));
31		}
32
33	<	public void testGetSet(){
34	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
33	>	/**
34	>	* constructor with null array throws NPE
35	>	*/
36	>	public void testConstructor2NPE() {
37	>	try {
38	>	int[] a = null;
39	>	AtomicIntegerArray ai = new AtomicIntegerArray(a);
40	>	shouldThrow();
41	>	} catch (NullPointerException success) {}
42	>	}
43	>
44	>	/**
45	>	* constructor with array is of same size and has all elements
46	>	*/
47	>	public void testConstructor2() {
48	>	int[] a = { 17, 3, -42, 99, -7};
49	>	AtomicIntegerArray ai = new AtomicIntegerArray(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	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
60	>	try {
61	>	ai.get(SIZE);
62	>	shouldThrow();
63	>	} catch (IndexOutOfBoundsException success) {
64	>	}
65	>	try {
66	>	ai.get(-1);
67	>	shouldThrow();
68	>	} catch (IndexOutOfBoundsException success) {
69	>	}
70	>	try {
71	>	ai.set(SIZE, 0);
72	>	shouldThrow();
73	>	} catch (IndexOutOfBoundsException success) {
74	>	}
75	>	try {
76	>	ai.set(-1, 0);
77	>	shouldThrow();
78	>	} catch (IndexOutOfBoundsException success) {
79	>	}
80	>	}
81	>
82	>	/**
83	>	* get returns the last value set at index
84	>	*/
85	>	public void testGetSet() {
86	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
87		for (int i = 0; i < SIZE; ++i) {
88		ai.set(i, 1);
89		assertEquals(1,ai.get(i));
#	Line 37 | Line 94 | public class AtomicIntegerArrayTest exte
94		}
95		}
96
97	<	public void testCompareAndSet(){
98	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
97	>	/**
98	>	* get returns the last value lazySet at index by same thread
99	>	*/
100	>	public void testGetLazySet() {
101	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
102	>	for (int i = 0; i < SIZE; ++i) {
103	>	ai.lazySet(i, 1);
104	>	assertEquals(1,ai.get(i));
105	>	ai.lazySet(i, 2);
106	>	assertEquals(2,ai.get(i));
107	>	ai.lazySet(i, -3);
108	>	assertEquals(-3,ai.get(i));
109	>	}
110	>	}
111	>
112	>	/**
113	>	* compareAndSet succeeds in changing value if equal to expected else fails
114	>	*/
115	>	public void testCompareAndSet() {
116	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
117		for (int i = 0; i < SIZE; ++i) {
118		ai.set(i, 1);
119		assertTrue(ai.compareAndSet(i, 1,2));
#	Line 51 | Line 126 | public class AtomicIntegerArrayTest exte
126		}
127		}
128
129	<	public void testWeakCompareAndSet(){
130	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
129	>	/**
130	>	* compareAndSet in one thread enables another waiting for value
131	>	* to succeed
132	>	*/
133	>	public void testCompareAndSetInMultipleThreads() throws Exception {
134	>	final AtomicIntegerArray a = new AtomicIntegerArray(1);
135	>	a.set(0, 1);
136	>	Thread t = new Thread(new Runnable() {
137	>	public void run() {
138	>	while (!a.compareAndSet(0, 2, 3)) Thread.yield();
139	>	}});
140	>
141	>	t.start();
142	>	assertTrue(a.compareAndSet(0, 1, 2));
143	>	t.join(LONG_DELAY_MS);
144	>	assertFalse(t.isAlive());
145	>	assertEquals(a.get(0), 3);
146	>	}
147	>
148	>	/**
149	>	* repeated weakCompareAndSet succeeds in changing value when equal
150	>	* to expected
151	>	*/
152	>	public void testWeakCompareAndSet() {
153	>	AtomicIntegerArray ai = new AtomicIntegerArray(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	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
164	>	/**
165	>	*  getAndSet returns previous value and sets to given value at given index
166	>	*/
167	>	public void testGetAndSet() {
168	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
169		for (int i = 0; i < SIZE; ++i) {
170		ai.set(i, 1);
171		assertEquals(1,ai.getAndSet(i,0));
#	Line 73 | Line 174 | public class AtomicIntegerArrayTest exte
174		}
175		}
176
177	<	public void testGetAndAdd(){
178	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
177	>	/**
178	>	*  getAndAdd returns previous value and adds given value
179	>	*/
180	>	public void testGetAndAdd() {
181	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
182		for (int i = 0; i < SIZE; ++i) {
183		ai.set(i, 1);
184		assertEquals(1,ai.getAndAdd(i,2));
#	Line 84 | Line 188 | public class AtomicIntegerArrayTest exte
188		}
189		}
190
191	<	public void testGetAndDecrement(){
192	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
191	>	/**
192	>	* getAndDecrement returns previous value and decrements
193	>	*/
194	>	public void testGetAndDecrement() {
195	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
196		for (int i = 0; i < SIZE; ++i) {
197		ai.set(i, 1);
198		assertEquals(1,ai.getAndDecrement(i));
#	Line 94 | Line 201 | public class AtomicIntegerArrayTest exte
201		}
202		}
203
204	<	public void testGetAndIncrement(){
205	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
204	>	/**
205	>	* getAndIncrement returns previous value and increments
206	>	*/
207	>	public void testGetAndIncrement() {
208	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
209		for (int i = 0; i < SIZE; ++i) {
210		ai.set(i, 1);
211		assertEquals(1,ai.getAndIncrement(i));
#	Line 108 | Line 218 | public class AtomicIntegerArrayTest exte
218		}
219		}
220
221	+	/**
222	+	*  addAndGet adds given value to current, and returns current value
223	+	*/
224		public void testAddAndGet() {
225	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
225	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
226		for (int i = 0; i < SIZE; ++i) {
227		ai.set(i, 1);
228		assertEquals(3,ai.addAndGet(i,2));
#	Line 119 | Line 232 | public class AtomicIntegerArrayTest exte
232		}
233		}
234
235	<	public void testDecrementAndGet(){
236	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
235	>	/**
236	>	* decrementAndGet decrements and returns current value
237	>	*/
238	>	public void testDecrementAndGet() {
239	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
240		for (int i = 0; i < SIZE; ++i) {
241		ai.set(i, 1);
242		assertEquals(0,ai.decrementAndGet(i));
#	Line 130 | Line 246 | public class AtomicIntegerArrayTest exte
246		}
247		}
248
249	+	/**
250	+	*  incrementAndGet increments and returns current value
251	+	*/
252		public void testIncrementAndGet() {
253	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
253	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
254		for (int i = 0; i < SIZE; ++i) {
255		ai.set(i, 1);
256		assertEquals(2,ai.incrementAndGet(i));
#	Line 145 | Line 264 | public class AtomicIntegerArrayTest exte
264		}
265
266		static final int COUNTDOWN = 100000;
267	<
267	>
268		class Counter implements Runnable {
269		final AtomicIntegerArray ai;
270		volatile int counts;
#	Line 168 | Line 287 | public class AtomicIntegerArrayTest exte
287		}
288		}
289
290	<	public void testCountingInMultipleThreads() {
291	<	try {
292	<	final AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
293	<	for (int i = 0; i < SIZE; ++i)
294	<	ai.set(i, COUNTDOWN);
295	<	Counter c1 = new Counter(ai);
296	<	Counter c2 = new Counter(ai);
297	<	Thread t1 = new Thread(c1);
298	<	Thread t2 = new Thread(c2);
299	<	t1.start();
300	<	t2.start();
301	<	t1.join();
302	<	t2.join();
303	<	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
304	<	}
305	<	catch(InterruptedException ie) {
306	<	fail("unexpected exception");
188	<	}
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() throws InterruptedException {
295	>	final AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
296	>	for (int i = 0; i < SIZE; ++i)
297	>	ai.set(i, COUNTDOWN);
298	>	Counter c1 = new Counter(ai);
299	>	Counter c2 = new Counter(ai);
300	>	Thread t1 = new Thread(c1);
301	>	Thread t2 = new Thread(c2);
302	>	t1.start();
303	>	t2.start();
304	>	t1.join();
305	>	t2.join();
306	>	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
307		}
308
309
310	<	public void testSerialization() {
311	<	AtomicIntegerArray l = new AtomicIntegerArray(SIZE);
312	<	for (int i = 0; i < SIZE; ++i)
310	>	/**
311	>	* a deserialized serialized array holds same values
312	>	*/
313	>	public void testSerialization() throws Exception {
314	>	AtomicIntegerArray l = new AtomicIntegerArray(SIZE);
315	>	for (int i = 0; i < SIZE; ++i)
316		l.set(i, -i);
317
318	<	try {
319	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
320	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
321	<	out.writeObject(l);
322	<	out.close();
323	<
324	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
325	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
326	<	AtomicIntegerArray r = (AtomicIntegerArray) in.readObject();
327	<	for (int i = 0; i < SIZE; ++i) {
207	<	assertEquals(l.get(i), r.get(i));
208	<	}
209	<	} catch(Exception e){
210	<	e.printStackTrace();
211	<	fail("unexpected exception");
318	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
319	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
320	>	out.writeObject(l);
321	>	out.close();
322	>
323	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
324	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
325	>	AtomicIntegerArray r = (AtomicIntegerArray) in.readObject();
326	>	for (int i = 0; i < SIZE; ++i) {
327	>	assertEquals(l.get(i), r.get(i));
328		}
329		}
330
331	+
332	+	/**
333	+	* toString returns current value.
334	+	*/
335	+	public void testToString() {
336	+	int[] a = { 17, 3, -42, 99, -7};
337	+	AtomicIntegerArray ai = new AtomicIntegerArray(a);
338	+	assertEquals(Arrays.toString(a), ai.toString());
339	+	}
340	+
341		}

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