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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 1.6 by dl, Sat Dec 27 19:26:43 2003 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
13	<	public class AtomicLongArrayTest extends TestCase
12	<	{
13	<	static final int N = 10;
14	<
13	>	public class AtomicLongArrayTest extends JSR166TestCase {
14		public static void main (String[] args) {
15		junit.textui.TestRunner.run (suite());
16		}
#	Line 19 | Line 18 | public class AtomicLongArrayTest extends
18		return new TestSuite(AtomicLongArrayTest.class);
19		}
20
21	+	/**
22	+	* constructor creates array of given size with all elements zero
23	+	*/
24		public void testConstructor(){
25	<	AtomicLongArray ai = new AtomicLongArray(N);
26	<	for (int i = 0; i < N; ++i)
25	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
26	>	for (int i = 0; i < SIZE; ++i)
27		assertEquals(0,ai.get(i));
28		}
29
30	+	/**
31	+	* get and set for out of bound indices throw IndexOutOfBoundsException
32	+	*/
33	+	public void testIndexing(){
34	+	AtomicLongArray ai = new AtomicLongArray(SIZE);
35	+	try {
36	+	ai.get(SIZE);
37	+	} catch(IndexOutOfBoundsException success){
38	+	}
39	+	try {
40	+	ai.get(-1);
41	+	} catch(IndexOutOfBoundsException success){
42	+	}
43	+	try {
44	+	ai.set(SIZE, 0);
45	+	} catch(IndexOutOfBoundsException success){
46	+	}
47	+	try {
48	+	ai.set(-1, 0);
49	+	} catch(IndexOutOfBoundsException success){
50	+	}
51	+	}
52	+
53	+	/**
54	+	* get returns the last value set at index
55	+	*/
56		public void testGetSet(){
57	<	AtomicLongArray ai = new AtomicLongArray(N);
58	<	for (int i = 0; i < N; ++i) {
57	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
58	>	for (int i = 0; i < SIZE; ++i) {
59		ai.set(i, 1);
60		assertEquals(1,ai.get(i));
61		ai.set(i, 2);
#	Line 37 | Line 65 | public class AtomicLongArrayTest extends
65		}
66		}
67
68	+	/**
69	+	* compareAndSet succeeds in changing value if equal to expected else fails
70	+	*/
71		public void testCompareAndSet(){
72	<	AtomicLongArray ai = new AtomicLongArray(N);
73	<	for (int i = 0; i < N; ++i) {
72	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
73	>	for (int i = 0; i < SIZE; ++i) {
74		ai.set(i, 1);
75		assertTrue(ai.compareAndSet(i, 1,2));
76		assertTrue(ai.compareAndSet(i, 2,-4));
#	Line 51 | Line 82 | public class AtomicLongArrayTest extends
82		}
83		}
84
85	+	/**
86	+	* compareAndSet in one thread enables another waiting for value
87	+	* to succeed
88	+	*/
89	+	public void testCompareAndSetInMultipleThreads() {
90	+	final AtomicLongArray a = new AtomicLongArray(1);
91	+	a.set(0, 1);
92	+	Thread t = new Thread(new Runnable() {
93	+	public void run() {
94	+	while(!a.compareAndSet(0, 2, 3)) Thread.yield();
95	+	}});
96	+	try {
97	+	t.start();
98	+	assertTrue(a.compareAndSet(0, 1, 2));
99	+	t.join(LONG_DELAY_MS);
100	+	assertFalse(t.isAlive());
101	+	assertEquals(a.get(0), 3);
102	+	}
103	+	catch(Exception e) {
104	+	unexpectedException();
105	+	}
106	+	}
107	+
108	+	/**
109	+	* repeated weakCompareAndSet succeeds in changing value when equal
110	+	* to expected
111	+	*/
112		public void testWeakCompareAndSet(){
113	<	AtomicLongArray ai = new AtomicLongArray(N);
114	<	for (int i = 0; i < N; ++i) {
113	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
114	>	for (int i = 0; i < SIZE; ++i) {
115		ai.set(i, 1);
116		while(!ai.weakCompareAndSet(i, 1,2));
117		while(!ai.weakCompareAndSet(i, 2,-4));
#	Line 63 | Line 121 | public class AtomicLongArrayTest extends
121		}
122		}
123
124	+	/**
125	+	*  getAndSet returns previous value and sets to given value at given index
126	+	*/
127		public void testGetAndSet(){
128	<	AtomicLongArray ai = new AtomicLongArray(N);
129	<	for (int i = 0; i < N; ++i) {
128	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
129	>	for (int i = 0; i < SIZE; ++i) {
130		ai.set(i, 1);
131		assertEquals(1,ai.getAndSet(i,0));
132		assertEquals(0,ai.getAndSet(i,-10));
#	Line 73 | Line 134 | public class AtomicLongArrayTest extends
134		}
135		}
136
137	+	/**
138	+	*  getAndAdd returns previous value and adds given value
139	+	*/
140		public void testGetAndAdd(){
141	<	AtomicLongArray ai = new AtomicLongArray(N);
142	<	for (int i = 0; i < N; ++i) {
141	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
142	>	for (int i = 0; i < SIZE; ++i) {
143		ai.set(i, 1);
144		assertEquals(1,ai.getAndAdd(i,2));
145		assertEquals(3,ai.get(i));
#	Line 84 | Line 148 | public class AtomicLongArrayTest extends
148		}
149		}
150
151	+	/**
152	+	* getAndDecrement returns previous value and decrements
153	+	*/
154		public void testGetAndDecrement(){
155	<	AtomicLongArray ai = new AtomicLongArray(N);
156	<	for (int i = 0; i < N; ++i) {
155	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
156	>	for (int i = 0; i < SIZE; ++i) {
157		ai.set(i, 1);
158		assertEquals(1,ai.getAndDecrement(i));
159		assertEquals(0,ai.getAndDecrement(i));
#	Line 94 | Line 161 | public class AtomicLongArrayTest extends
161		}
162		}
163
164	+	/**
165	+	* getAndIncrement returns previous value and increments
166	+	*/
167		public void testGetAndIncrement(){
168	<	AtomicLongArray ai = new AtomicLongArray(N);
169	<	for (int i = 0; i < N; ++i) {
168	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
169	>	for (int i = 0; i < SIZE; ++i) {
170		ai.set(i, 1);
171		assertEquals(1,ai.getAndIncrement(i));
172		assertEquals(2,ai.get(i));
#	Line 108 | Line 178 | public class AtomicLongArrayTest extends
178		}
179		}
180
181	+	/**
182	+	*  addAndGet adds given value to current, and returns current value
183	+	*/
184		public void testAddAndGet() {
185	<	AtomicLongArray ai = new AtomicLongArray(N);
186	<	for (int i = 0; i < N; ++i) {
185	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
186	>	for (int i = 0; i < SIZE; ++i) {
187		ai.set(i, 1);
188		assertEquals(3,ai.addAndGet(i,2));
189		assertEquals(3,ai.get(i));
#	Line 119 | Line 192 | public class AtomicLongArrayTest extends
192		}
193		}
194
195	+	/**
196	+	* decrementAndGet decrements and returns current value
197	+	*/
198		public void testDecrementAndGet(){
199	<	AtomicLongArray ai = new AtomicLongArray(N);
200	<	for (int i = 0; i < N; ++i) {
199	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
200	>	for (int i = 0; i < SIZE; ++i) {
201		ai.set(i, 1);
202		assertEquals(0,ai.decrementAndGet(i));
203		assertEquals(-1,ai.decrementAndGet(i));
#	Line 130 | Line 206 | public class AtomicLongArrayTest extends
206		}
207		}
208
209	+	/**
210	+	* incrementAndGet increments and returns current value
211	+	*/
212		public void testIncrementAndGet() {
213	<	AtomicLongArray ai = new AtomicLongArray(N);
214	<	for (int i = 0; i < N; ++i) {
213	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
214	>	for (int i = 0; i < SIZE; ++i) {
215		ai.set(i, 1);
216		assertEquals(2,ai.incrementAndGet(i));
217		assertEquals(2,ai.get(i));
#	Line 144 | Line 223 | public class AtomicLongArrayTest extends
223		}
224		}
225
226	+	static final long COUNTDOWN = 100000;
227	+
228	+	class Counter implements Runnable {
229	+	final AtomicLongArray ai;
230	+	volatile long counts;
231	+	Counter(AtomicLongArray a) { ai = a; }
232	+	public void run() {
233	+	for (;;) {
234	+	boolean done = true;
235	+	for (int i = 0; i < ai.length(); ++i) {
236	+	long v = ai.get(i);
237	+	threadAssertTrue(v >= 0);
238	+	if (v != 0) {
239	+	done = false;
240	+	if (ai.compareAndSet(i, v, v-1))
241	+	++counts;
242	+	}
243	+	}
244	+	if (done)
245	+	break;
246	+	}
247	+	}
248	+	}
249	+
250	+	/**
251	+	* Multiple threads using same array of counters successfully
252	+	* update a number of times equal to total count
253	+	*/
254	+	public void testCountingInMultipleThreads() {
255	+	try {
256	+	final AtomicLongArray ai = new AtomicLongArray(SIZE);
257	+	for (int i = 0; i < SIZE; ++i)
258	+	ai.set(i, COUNTDOWN);
259	+	Counter c1 = new Counter(ai);
260	+	Counter c2 = new Counter(ai);
261	+	Thread t1 = new Thread(c1);
262	+	Thread t2 = new Thread(c2);
263	+	t1.start();
264	+	t2.start();
265	+	t1.join();
266	+	t2.join();
267	+	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
268	+	}
269	+	catch(InterruptedException ie) {
270	+	unexpectedException();
271	+	}
272	+	}
273	+
274	+	/**
275	+	* a deserialized serialized array holds same values
276	+	*/
277	+	public void testSerialization() {
278	+	AtomicLongArray l = new AtomicLongArray(SIZE);
279	+	for (int i = 0; i < SIZE; ++i)
280	+	l.set(i, -i);
281	+
282	+	try {
283	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
284	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
285	+	out.writeObject(l);
286	+	out.close();
287	+
288	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
289	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
290	+	AtomicLongArray r = (AtomicLongArray) in.readObject();
291	+	for (int i = 0; i < SIZE; ++i) {
292	+	assertEquals(l.get(i), r.get(i));
293	+	}
294	+	} catch(Exception e){
295	+	unexpectedException();
296	+	}
297	+	}
298	+
299	+
300		}

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