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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 1.7 by dl, Thu Jan 8 01:29:46 2004 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	+	* constructor with null array throws NPE
32	+	*/
33	+	public void testConstructor2NPE() {
34	+	try {
35	+	long[] a = null;
36	+	AtomicLongArray ai = new AtomicLongArray(a);
37	+	} catch (NullPointerException success) {
38	+	} catch (Exception ex) {
39	+	unexpectedException();
40	+	}
41	+	}
42	+
43	+	/**
44	+	* constructor with array is of same size and has all elements
45	+	*/
46	+	public void testConstructor2() {
47	+	long[] a = { 17L, 3L, -42L, 99L, -7L};
48	+	AtomicLongArray ai = new AtomicLongArray(a);
49	+	assertEquals(a.length, ai.length());
50	+	for (int i = 0; i < a.length; ++i)
51	+	assertEquals(a[i], ai.get(i));
52	+	}
53	+
54	+	/**
55	+	* get and set for out of bound indices throw IndexOutOfBoundsException
56	+	*/
57	+	public void testIndexing(){
58	+	AtomicLongArray ai = new AtomicLongArray(SIZE);
59	+	try {
60	+	ai.get(SIZE);
61	+	} catch(IndexOutOfBoundsException success){
62	+	}
63	+	try {
64	+	ai.get(-1);
65	+	} catch(IndexOutOfBoundsException success){
66	+	}
67	+	try {
68	+	ai.set(SIZE, 0);
69	+	} catch(IndexOutOfBoundsException success){
70	+	}
71	+	try {
72	+	ai.set(-1, 0);
73	+	} catch(IndexOutOfBoundsException success){
74	+	}
75	+	}
76	+
77	+	/**
78	+	* get returns the last value set at index
79	+	*/
80		public void testGetSet(){
81	<	AtomicLongArray ai = new AtomicLongArray(N);
82	<	for (int i = 0; i < N; ++i) {
81	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
82	>	for (int i = 0; i < SIZE; ++i) {
83		ai.set(i, 1);
84		assertEquals(1,ai.get(i));
85		ai.set(i, 2);
#	Line 37 | Line 89 | public class AtomicLongArrayTest extends
89		}
90		}
91
92	+	/**
93	+	* compareAndSet succeeds in changing value if equal to expected else fails
94	+	*/
95		public void testCompareAndSet(){
96	<	AtomicLongArray ai = new AtomicLongArray(N);
97	<	for (int i = 0; i < N; ++i) {
96	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
97	>	for (int i = 0; i < SIZE; ++i) {
98		ai.set(i, 1);
99		assertTrue(ai.compareAndSet(i, 1,2));
100		assertTrue(ai.compareAndSet(i, 2,-4));
#	Line 51 | Line 106 | public class AtomicLongArrayTest extends
106		}
107		}
108
109	+	/**
110	+	* compareAndSet in one thread enables another waiting for value
111	+	* to succeed
112	+	*/
113	+	public void testCompareAndSetInMultipleThreads() {
114	+	final AtomicLongArray a = new AtomicLongArray(1);
115	+	a.set(0, 1);
116	+	Thread t = new Thread(new Runnable() {
117	+	public void run() {
118	+	while(!a.compareAndSet(0, 2, 3)) Thread.yield();
119	+	}});
120	+	try {
121	+	t.start();
122	+	assertTrue(a.compareAndSet(0, 1, 2));
123	+	t.join(LONG_DELAY_MS);
124	+	assertFalse(t.isAlive());
125	+	assertEquals(a.get(0), 3);
126	+	}
127	+	catch(Exception e) {
128	+	unexpectedException();
129	+	}
130	+	}
131	+
132	+	/**
133	+	* repeated weakCompareAndSet succeeds in changing value when equal
134	+	* to expected
135	+	*/
136		public void testWeakCompareAndSet(){
137	<	AtomicLongArray ai = new AtomicLongArray(N);
138	<	for (int i = 0; i < N; ++i) {
137	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
138	>	for (int i = 0; i < SIZE; ++i) {
139		ai.set(i, 1);
140		while(!ai.weakCompareAndSet(i, 1,2));
141		while(!ai.weakCompareAndSet(i, 2,-4));
#	Line 63 | Line 145 | public class AtomicLongArrayTest extends
145		}
146		}
147
148	+	/**
149	+	*  getAndSet returns previous value and sets to given value at given index
150	+	*/
151		public void testGetAndSet(){
152	<	AtomicLongArray ai = new AtomicLongArray(N);
153	<	for (int i = 0; i < N; ++i) {
152	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
153	>	for (int i = 0; i < SIZE; ++i) {
154		ai.set(i, 1);
155		assertEquals(1,ai.getAndSet(i,0));
156		assertEquals(0,ai.getAndSet(i,-10));
#	Line 73 | Line 158 | public class AtomicLongArrayTest extends
158		}
159		}
160
161	+	/**
162	+	*  getAndAdd returns previous value and adds given value
163	+	*/
164		public void testGetAndAdd(){
165	<	AtomicLongArray ai = new AtomicLongArray(N);
166	<	for (int i = 0; i < N; ++i) {
165	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
166	>	for (int i = 0; i < SIZE; ++i) {
167		ai.set(i, 1);
168		assertEquals(1,ai.getAndAdd(i,2));
169		assertEquals(3,ai.get(i));
#	Line 84 | Line 172 | public class AtomicLongArrayTest extends
172		}
173		}
174
175	+	/**
176	+	* getAndDecrement returns previous value and decrements
177	+	*/
178		public void testGetAndDecrement(){
179	<	AtomicLongArray ai = new AtomicLongArray(N);
180	<	for (int i = 0; i < N; ++i) {
179	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
180	>	for (int i = 0; i < SIZE; ++i) {
181		ai.set(i, 1);
182		assertEquals(1,ai.getAndDecrement(i));
183		assertEquals(0,ai.getAndDecrement(i));
#	Line 94 | Line 185 | public class AtomicLongArrayTest extends
185		}
186		}
187
188	+	/**
189	+	* getAndIncrement returns previous value and increments
190	+	*/
191		public void testGetAndIncrement(){
192	<	AtomicLongArray ai = new AtomicLongArray(N);
193	<	for (int i = 0; i < N; ++i) {
192	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
193	>	for (int i = 0; i < SIZE; ++i) {
194		ai.set(i, 1);
195		assertEquals(1,ai.getAndIncrement(i));
196		assertEquals(2,ai.get(i));
#	Line 108 | Line 202 | public class AtomicLongArrayTest extends
202		}
203		}
204
205	+	/**
206	+	*  addAndGet adds given value to current, and returns current value
207	+	*/
208		public void testAddAndGet() {
209	<	AtomicLongArray ai = new AtomicLongArray(N);
210	<	for (int i = 0; i < N; ++i) {
209	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
210	>	for (int i = 0; i < SIZE; ++i) {
211		ai.set(i, 1);
212		assertEquals(3,ai.addAndGet(i,2));
213		assertEquals(3,ai.get(i));
#	Line 119 | Line 216 | public class AtomicLongArrayTest extends
216		}
217		}
218
219	+	/**
220	+	* decrementAndGet decrements and returns current value
221	+	*/
222		public void testDecrementAndGet(){
223	<	AtomicLongArray ai = new AtomicLongArray(N);
224	<	for (int i = 0; i < N; ++i) {
223	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
224	>	for (int i = 0; i < SIZE; ++i) {
225		ai.set(i, 1);
226		assertEquals(0,ai.decrementAndGet(i));
227		assertEquals(-1,ai.decrementAndGet(i));
#	Line 130 | Line 230 | public class AtomicLongArrayTest extends
230		}
231		}
232
233	+	/**
234	+	* incrementAndGet increments and returns current value
235	+	*/
236		public void testIncrementAndGet() {
237	<	AtomicLongArray ai = new AtomicLongArray(N);
238	<	for (int i = 0; i < N; ++i) {
237	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
238	>	for (int i = 0; i < SIZE; ++i) {
239		ai.set(i, 1);
240		assertEquals(2,ai.incrementAndGet(i));
241		assertEquals(2,ai.get(i));
#	Line 144 | Line 247 | public class AtomicLongArrayTest extends
247		}
248		}
249
250	+	static final long COUNTDOWN = 100000;
251	+
252	+	class Counter implements Runnable {
253	+	final AtomicLongArray ai;
254	+	volatile long counts;
255	+	Counter(AtomicLongArray a) { ai = a; }
256	+	public void run() {
257	+	for (;;) {
258	+	boolean done = true;
259	+	for (int i = 0; i < ai.length(); ++i) {
260	+	long v = ai.get(i);
261	+	threadAssertTrue(v >= 0);
262	+	if (v != 0) {
263	+	done = false;
264	+	if (ai.compareAndSet(i, v, v-1))
265	+	++counts;
266	+	}
267	+	}
268	+	if (done)
269	+	break;
270	+	}
271	+	}
272	+	}
273	+
274	+	/**
275	+	* Multiple threads using same array of counters successfully
276	+	* update a number of times equal to total count
277	+	*/
278	+	public void testCountingInMultipleThreads() {
279	+	try {
280	+	final AtomicLongArray ai = new AtomicLongArray(SIZE);
281	+	for (int i = 0; i < SIZE; ++i)
282	+	ai.set(i, COUNTDOWN);
283	+	Counter c1 = new Counter(ai);
284	+	Counter c2 = new Counter(ai);
285	+	Thread t1 = new Thread(c1);
286	+	Thread t2 = new Thread(c2);
287	+	t1.start();
288	+	t2.start();
289	+	t1.join();
290	+	t2.join();
291	+	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
292	+	}
293	+	catch(InterruptedException ie) {
294	+	unexpectedException();
295	+	}
296	+	}
297	+
298	+	/**
299	+	* a deserialized serialized array holds same values
300	+	*/
301	+	public void testSerialization() {
302	+	AtomicLongArray l = new AtomicLongArray(SIZE);
303	+	for (int i = 0; i < SIZE; ++i)
304	+	l.set(i, -i);
305	+
306	+	try {
307	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
308	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
309	+	out.writeObject(l);
310	+	out.close();
311	+
312	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
313	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
314	+	AtomicLongArray r = (AtomicLongArray) in.readObject();
315	+	for (int i = 0; i < SIZE; ++i) {
316	+	assertEquals(l.get(i), r.get(i));
317	+	}
318	+	} catch(Exception e){
319	+	unexpectedException();
320	+	}
321	+	}
322	+
323	+
324		}

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