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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 1.17 by jsr166, Wed Aug 25 00:07:03 2010 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
16	<	public static void main (String[] args) {
17	<	junit.textui.TestRunner.run (suite());
16	>	public static void main(String[] args) {
17	>	junit.textui.TestRunner.run(suite());
18		}
19		public static Test suite() {
20		return new TestSuite(AtomicIntegerArrayTest.class);
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));
120		assertTrue(ai.compareAndSet(i, 2,-4));
121		assertEquals(-4,ai.get(i));
122		assertFalse(ai.compareAndSet(i, -5,7));
123	<	assertFalse((7 == ai.get(i)));
123	>	assertEquals(-4,ai.get(i));
124		assertTrue(ai.compareAndSet(i, -4,7));
125		assertEquals(7,ai.get(i));
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 CheckedRunnable() {
137	>	public void realRun() {
138	>	while (!a.compareAndSet(0, 2, 3))
139	>	Thread.yield();
140	>	}});
141	>
142	>	t.start();
143	>	assertTrue(a.compareAndSet(0, 1, 2));
144	>	t.join(LONG_DELAY_MS);
145	>	assertFalse(t.isAlive());
146	>	assertEquals(a.get(0), 3);
147	>	}
148	>
149	>	/**
150	>	* repeated weakCompareAndSet succeeds in changing value when equal
151	>	* to expected
152	>	*/
153	>	public void testWeakCompareAndSet() {
154	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
155		for (int i = 0; i < SIZE; ++i) {
156		ai.set(i, 1);
157	<	while(!ai.weakCompareAndSet(i, 1,2));
158	<	while(!ai.weakCompareAndSet(i, 2,-4));
157	>	while (!ai.weakCompareAndSet(i, 1,2));
158	>	while (!ai.weakCompareAndSet(i, 2,-4));
159		assertEquals(-4,ai.get(i));
160	<	while(!ai.weakCompareAndSet(i, -4,7));
160	>	while (!ai.weakCompareAndSet(i, -4,7));
161		assertEquals(7,ai.get(i));
162		}
163		}
164
165	<	public void testGetAndSet(){
166	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
165	>	/**
166	>	*  getAndSet returns previous value and sets to given value at given index
167	>	*/
168	>	public void testGetAndSet() {
169	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
170		for (int i = 0; i < SIZE; ++i) {
171		ai.set(i, 1);
172		assertEquals(1,ai.getAndSet(i,0));
#	Line 73 | Line 175 | public class AtomicIntegerArrayTest exte
175		}
176		}
177
178	<	public void testGetAndAdd(){
179	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
178	>	/**
179	>	*  getAndAdd returns previous value and adds given value
180	>	*/
181	>	public void testGetAndAdd() {
182	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
183		for (int i = 0; i < SIZE; ++i) {
184		ai.set(i, 1);
185		assertEquals(1,ai.getAndAdd(i,2));
#	Line 84 | Line 189 | public class AtomicIntegerArrayTest exte
189		}
190		}
191
192	<	public void testGetAndDecrement(){
193	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
192	>	/**
193	>	* getAndDecrement returns previous value and decrements
194	>	*/
195	>	public void testGetAndDecrement() {
196	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
197		for (int i = 0; i < SIZE; ++i) {
198		ai.set(i, 1);
199		assertEquals(1,ai.getAndDecrement(i));
#	Line 94 | Line 202 | public class AtomicIntegerArrayTest exte
202		}
203		}
204
205	<	public void testGetAndIncrement(){
206	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
205	>	/**
206	>	* getAndIncrement returns previous value and increments
207	>	*/
208	>	public void testGetAndIncrement() {
209	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
210		for (int i = 0; i < SIZE; ++i) {
211		ai.set(i, 1);
212		assertEquals(1,ai.getAndIncrement(i));
#	Line 108 | Line 219 | public class AtomicIntegerArrayTest exte
219		}
220		}
221
222	+	/**
223	+	*  addAndGet adds given value to current, and returns current value
224	+	*/
225		public void testAddAndGet() {
226	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
226	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
227		for (int i = 0; i < SIZE; ++i) {
228		ai.set(i, 1);
229		assertEquals(3,ai.addAndGet(i,2));
#	Line 119 | Line 233 | public class AtomicIntegerArrayTest exte
233		}
234		}
235
236	<	public void testDecrementAndGet(){
237	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
236	>	/**
237	>	* decrementAndGet decrements and returns current value
238	>	*/
239	>	public void testDecrementAndGet() {
240	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
241		for (int i = 0; i < SIZE; ++i) {
242		ai.set(i, 1);
243		assertEquals(0,ai.decrementAndGet(i));
#	Line 130 | Line 247 | public class AtomicIntegerArrayTest exte
247		}
248		}
249
250	+	/**
251	+	*  incrementAndGet increments and returns current value
252	+	*/
253		public void testIncrementAndGet() {
254	<	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
254	>	AtomicIntegerArray ai = new AtomicIntegerArray(SIZE);
255		for (int i = 0; i < SIZE; ++i) {
256		ai.set(i, 1);
257		assertEquals(2,ai.incrementAndGet(i));
#	Line 145 | Line 265 | public class AtomicIntegerArrayTest exte
265		}
266
267		static final int COUNTDOWN = 100000;
268	<
268	>
269		class Counter implements Runnable {
270		final AtomicIntegerArray ai;
271		volatile int counts;
#	Line 168 | Line 288 | public class AtomicIntegerArrayTest exte
288		}
289		}
290
291	<	public void testCountingInMultipleThreads() {
292	<	try {
293	<	final AtomicIntegerArray ai = new AtomicIntegerArray(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	<	catch(InterruptedException ie) {
307	<	fail("unexpected exception");
188	<	}
291	>	/**
292	>	* Multiple threads using same array of counters successfully
293	>	* update a number of times equal to total count
294	>	*/
295	>	public void testCountingInMultipleThreads() throws InterruptedException {
296	>	final AtomicIntegerArray ai = new AtomicIntegerArray(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
310
311	<	public void testSerialization() {
312	<	AtomicIntegerArray l = new AtomicIntegerArray(SIZE);
313	<	for (int i = 0; i < SIZE; ++i)
311	>	/**
312	>	* a deserialized serialized array holds same values
313	>	*/
314	>	public void testSerialization() throws Exception {
315	>	AtomicIntegerArray l = new AtomicIntegerArray(SIZE);
316	>	for (int i = 0; i < SIZE; ++i)
317		l.set(i, -i);
318
319	<	try {
320	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
321	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
322	<	out.writeObject(l);
323	<	out.close();
324	<
325	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
326	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
327	<	AtomicIntegerArray r = (AtomicIntegerArray) in.readObject();
328	<	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");
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) {
328	>	assertEquals(l.get(i), r.get(i));
329		}
330		}
331
332	+
333	+	/**
334	+	* toString returns current value.
335	+	*/
336	+	public void testToString() {
337	+	int[] a = { 17, 3, -42, 99, -7};
338	+	AtomicIntegerArray ai = new AtomicIntegerArray(a);
339	+	assertEquals(Arrays.toString(a), ai.toString());
340	+	}
341	+
342		}

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