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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 1.8 by dl, Sat Jan 10 01:41:59 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	+	import java.util.*;
13
14	<	public class AtomicLongArrayTest extends TestCase
12	<	{
13	<	static final int N = 10;
14	<
14	>	public class AtomicLongArrayTest extends JSR166TestCase {
15		public static void main (String[] args) {
16		junit.textui.TestRunner.run (suite());
17		}
#	Line 19 | Line 19 | public class AtomicLongArrayTest extends
19		return new TestSuite(AtomicLongArrayTest.class);
20		}
21
22	+	/**
23	+	* constructor creates array of given size with all elements zero
24	+	*/
25		public void testConstructor(){
26	<	AtomicLongArray ai = new AtomicLongArray(N);
27	<	for (int i = 0; i < N; ++i)
26	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
27	>	for (int i = 0; i < SIZE; ++i)
28		assertEquals(0,ai.get(i));
29		}
30
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	+	} catch (NullPointerException success) {
39	+	} catch (Exception ex) {
40	+	unexpectedException();
41	+	}
42	+	}
43	+
44	+	/**
45	+	* constructor with array is of same size and has all elements
46	+	*/
47	+	public void testConstructor2() {
48	+	long[] a = { 17L, 3L, -42L, 99L, -7L};
49	+	AtomicLongArray ai = new AtomicLongArray(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	+	AtomicLongArray ai = new AtomicLongArray(SIZE);
60	+	try {
61	+	ai.get(SIZE);
62	+	} catch(IndexOutOfBoundsException success){
63	+	}
64	+	try {
65	+	ai.get(-1);
66	+	} catch(IndexOutOfBoundsException success){
67	+	}
68	+	try {
69	+	ai.set(SIZE, 0);
70	+	} catch(IndexOutOfBoundsException success){
71	+	}
72	+	try {
73	+	ai.set(-1, 0);
74	+	} catch(IndexOutOfBoundsException success){
75	+	}
76	+	}
77	+
78	+	/**
79	+	* get returns the last value set at index
80	+	*/
81		public void testGetSet(){
82	<	AtomicLongArray ai = new AtomicLongArray(N);
83	<	for (int i = 0; i < N; ++i) {
82	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
83	>	for (int i = 0; i < SIZE; ++i) {
84		ai.set(i, 1);
85		assertEquals(1,ai.get(i));
86		ai.set(i, 2);
#	Line 37 | Line 90 | public class AtomicLongArrayTest extends
90		}
91		}
92
93	+	/**
94	+	* compareAndSet succeeds in changing value if equal to expected else fails
95	+	*/
96		public void testCompareAndSet(){
97	<	AtomicLongArray ai = new AtomicLongArray(N);
98	<	for (int i = 0; i < N; ++i) {
97	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
98	>	for (int i = 0; i < SIZE; ++i) {
99		ai.set(i, 1);
100		assertTrue(ai.compareAndSet(i, 1,2));
101		assertTrue(ai.compareAndSet(i, 2,-4));
#	Line 51 | Line 107 | public class AtomicLongArrayTest extends
107		}
108		}
109
110	+	/**
111	+	* compareAndSet in one thread enables another waiting for value
112	+	* to succeed
113	+	*/
114	+	public void testCompareAndSetInMultipleThreads() {
115	+	final AtomicLongArray a = new AtomicLongArray(1);
116	+	a.set(0, 1);
117	+	Thread t = new Thread(new Runnable() {
118	+	public void run() {
119	+	while(!a.compareAndSet(0, 2, 3)) Thread.yield();
120	+	}});
121	+	try {
122	+	t.start();
123	+	assertTrue(a.compareAndSet(0, 1, 2));
124	+	t.join(LONG_DELAY_MS);
125	+	assertFalse(t.isAlive());
126	+	assertEquals(a.get(0), 3);
127	+	}
128	+	catch(Exception e) {
129	+	unexpectedException();
130	+	}
131	+	}
132	+
133	+	/**
134	+	* repeated weakCompareAndSet succeeds in changing value when equal
135	+	* to expected
136	+	*/
137		public void testWeakCompareAndSet(){
138	<	AtomicLongArray ai = new AtomicLongArray(N);
139	<	for (int i = 0; i < N; ++i) {
138	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
139	>	for (int i = 0; i < SIZE; ++i) {
140		ai.set(i, 1);
141		while(!ai.weakCompareAndSet(i, 1,2));
142		while(!ai.weakCompareAndSet(i, 2,-4));
#	Line 63 | Line 146 | public class AtomicLongArrayTest extends
146		}
147		}
148
149	+	/**
150	+	*  getAndSet returns previous value and sets to given value at given index
151	+	*/
152		public void testGetAndSet(){
153	<	AtomicLongArray ai = new AtomicLongArray(N);
154	<	for (int i = 0; i < N; ++i) {
153	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
154	>	for (int i = 0; i < SIZE; ++i) {
155		ai.set(i, 1);
156		assertEquals(1,ai.getAndSet(i,0));
157		assertEquals(0,ai.getAndSet(i,-10));
#	Line 73 | Line 159 | public class AtomicLongArrayTest extends
159		}
160		}
161
162	+	/**
163	+	*  getAndAdd returns previous value and adds given value
164	+	*/
165		public void testGetAndAdd(){
166	<	AtomicLongArray ai = new AtomicLongArray(N);
167	<	for (int i = 0; i < N; ++i) {
166	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
167	>	for (int i = 0; i < SIZE; ++i) {
168		ai.set(i, 1);
169		assertEquals(1,ai.getAndAdd(i,2));
170		assertEquals(3,ai.get(i));
#	Line 84 | Line 173 | public class AtomicLongArrayTest extends
173		}
174		}
175
176	+	/**
177	+	* getAndDecrement returns previous value and decrements
178	+	*/
179		public void testGetAndDecrement(){
180	<	AtomicLongArray ai = new AtomicLongArray(N);
181	<	for (int i = 0; i < N; ++i) {
180	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
181	>	for (int i = 0; i < SIZE; ++i) {
182		ai.set(i, 1);
183		assertEquals(1,ai.getAndDecrement(i));
184		assertEquals(0,ai.getAndDecrement(i));
#	Line 94 | Line 186 | public class AtomicLongArrayTest extends
186		}
187		}
188
189	+	/**
190	+	* getAndIncrement returns previous value and increments
191	+	*/
192		public void testGetAndIncrement(){
193	<	AtomicLongArray ai = new AtomicLongArray(N);
194	<	for (int i = 0; i < N; ++i) {
193	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
194	>	for (int i = 0; i < SIZE; ++i) {
195		ai.set(i, 1);
196		assertEquals(1,ai.getAndIncrement(i));
197		assertEquals(2,ai.get(i));
#	Line 108 | Line 203 | public class AtomicLongArrayTest extends
203		}
204		}
205
206	+	/**
207	+	*  addAndGet adds given value to current, and returns current value
208	+	*/
209		public void testAddAndGet() {
210	<	AtomicLongArray ai = new AtomicLongArray(N);
211	<	for (int i = 0; i < N; ++i) {
210	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
211	>	for (int i = 0; i < SIZE; ++i) {
212		ai.set(i, 1);
213		assertEquals(3,ai.addAndGet(i,2));
214		assertEquals(3,ai.get(i));
#	Line 119 | Line 217 | public class AtomicLongArrayTest extends
217		}
218		}
219
220	+	/**
221	+	* decrementAndGet decrements and returns current value
222	+	*/
223		public void testDecrementAndGet(){
224	<	AtomicLongArray ai = new AtomicLongArray(N);
225	<	for (int i = 0; i < N; ++i) {
224	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
225	>	for (int i = 0; i < SIZE; ++i) {
226		ai.set(i, 1);
227		assertEquals(0,ai.decrementAndGet(i));
228		assertEquals(-1,ai.decrementAndGet(i));
#	Line 130 | Line 231 | public class AtomicLongArrayTest extends
231		}
232		}
233
234	+	/**
235	+	* incrementAndGet increments and returns current value
236	+	*/
237		public void testIncrementAndGet() {
238	<	AtomicLongArray ai = new AtomicLongArray(N);
239	<	for (int i = 0; i < N; ++i) {
238	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
239	>	for (int i = 0; i < SIZE; ++i) {
240		ai.set(i, 1);
241		assertEquals(2,ai.incrementAndGet(i));
242		assertEquals(2,ai.get(i));
#	Line 144 | Line 248 | public class AtomicLongArrayTest extends
248		}
249		}
250
251	+	static final long COUNTDOWN = 100000;
252	+
253	+	class Counter implements Runnable {
254	+	final AtomicLongArray ai;
255	+	volatile long counts;
256	+	Counter(AtomicLongArray a) { ai = a; }
257	+	public void run() {
258	+	for (;;) {
259	+	boolean done = true;
260	+	for (int i = 0; i < ai.length(); ++i) {
261	+	long v = ai.get(i);
262	+	threadAssertTrue(v >= 0);
263	+	if (v != 0) {
264	+	done = false;
265	+	if (ai.compareAndSet(i, v, v-1))
266	+	++counts;
267	+	}
268	+	}
269	+	if (done)
270	+	break;
271	+	}
272	+	}
273	+	}
274	+
275	+	/**
276	+	* Multiple threads using same array of counters successfully
277	+	* update a number of times equal to total count
278	+	*/
279	+	public void testCountingInMultipleThreads() {
280	+	try {
281	+	final AtomicLongArray ai = new AtomicLongArray(SIZE);
282	+	for (int i = 0; i < SIZE; ++i)
283	+	ai.set(i, COUNTDOWN);
284	+	Counter c1 = new Counter(ai);
285	+	Counter c2 = new Counter(ai);
286	+	Thread t1 = new Thread(c1);
287	+	Thread t2 = new Thread(c2);
288	+	t1.start();
289	+	t2.start();
290	+	t1.join();
291	+	t2.join();
292	+	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
293	+	}
294	+	catch(InterruptedException ie) {
295	+	unexpectedException();
296	+	}
297	+	}
298	+
299	+	/**
300	+	* a deserialized serialized array holds same values
301	+	*/
302	+	public void testSerialization() {
303	+	AtomicLongArray l = new AtomicLongArray(SIZE);
304	+	for (int i = 0; i < SIZE; ++i)
305	+	l.set(i, -i);
306	+
307	+	try {
308	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
309	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
310	+	out.writeObject(l);
311	+	out.close();
312	+
313	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
314	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
315	+	AtomicLongArray r = (AtomicLongArray) in.readObject();
316	+	for (int i = 0; i < SIZE; ++i) {
317	+	assertEquals(l.get(i), r.get(i));
318	+	}
319	+	} catch(Exception e){
320	+	unexpectedException();
321	+	}
322	+	}
323	+
324	+	/**
325	+	* toString returns current value.
326	+	*/
327	+	public void testToString() {
328	+	long[] a = { 17, 3, -42, 99, -7};
329	+	AtomicLongArray ai = new AtomicLongArray(a);
330	+	assertEquals(Arrays.toString(a), ai.toString());
331	+	}
332	+
333	+
334		}

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