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

Comparing jsr166/src/test/tck/AtomicLongArrayTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 18:20:07 2003 UTC vs.
Revision 1.22 by jsr166, Fri Jun 10 19:45:01 2011 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/publicdomain/zero/1.0/
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.*;
10	>	import java.util.Arrays;
11	>	import java.util.concurrent.atomic.AtomicLongArray;
12
13		public class AtomicLongArrayTest extends JSR166TestCase {
14	<	public static void main (String[] args) {
15	<	junit.textui.TestRunner.run (suite());
14	>	public static void main(String[] args) {
15	>	junit.textui.TestRunner.run(suite());
16		}
17		public static Test suite() {
18		return new TestSuite(AtomicLongArrayTest.class);
19		}
20
21		/**
22	<	*
22	>	* constructor creates array of given size with all elements zero
23		*/
24	<	public void testConstructor(){
24	>	public void testConstructor() {
25		AtomicLongArray ai = new AtomicLongArray(SIZE);
26	<	for (int i = 0; i < SIZE; ++i)
26	>	for (int i = 0; i < SIZE; ++i)
27		assertEquals(0,ai.get(i));
28		}
29
30		/**
31	<	*
31	>	* constructor with null array throws NPE
32		*/
33	<	public void testGetSet(){
34	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
33	>	public void testConstructor2NPE() {
34	>	try {
35	>	long[] a = null;
36	>	AtomicLongArray ai = new AtomicLongArray(a);
37	>	shouldThrow();
38	>	} catch (NullPointerException success) {}
39	>	}
40	>
41	>	/**
42	>	* constructor with array is of same size and has all elements
43	>	*/
44	>	public void testConstructor2() {
45	>	long[] a = { 17L, 3L, -42L, 99L, -7L };
46	>	AtomicLongArray ai = new AtomicLongArray(a);
47	>	assertEquals(a.length, ai.length());
48	>	for (int i = 0; i < a.length; ++i)
49	>	assertEquals(a[i], ai.get(i));
50	>	}
51	>
52	>	/**
53	>	* get and set for out of bound indices throw IndexOutOfBoundsException
54	>	*/
55	>	public void testIndexing() {
56	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
57	>	try {
58	>	ai.get(SIZE);
59	>	shouldThrow();
60	>	} catch (IndexOutOfBoundsException success) {
61	>	}
62	>	try {
63	>	ai.get(-1);
64	>	shouldThrow();
65	>	} catch (IndexOutOfBoundsException success) {
66	>	}
67	>	try {
68	>	ai.set(SIZE, 0);
69	>	shouldThrow();
70	>	} catch (IndexOutOfBoundsException success) {
71	>	}
72	>	try {
73	>	ai.set(-1, 0);
74	>	shouldThrow();
75	>	} catch (IndexOutOfBoundsException success) {
76	>	}
77	>	}
78	>
79	>	/**
80	>	* get returns the last value set at index
81	>	*/
82	>	public void testGetSet() {
83	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
84		for (int i = 0; i < SIZE; ++i) {
85		ai.set(i, 1);
86		assertEquals(1,ai.get(i));
#	Line 42 | Line 92 | public class AtomicLongArrayTest extends
92		}
93
94		/**
95	<	*
95	>	* get returns the last value lazySet at index by same thread
96		*/
97	<	public void testCompareAndSet(){
98	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
97	>	public void testGetLazySet() {
98	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
99	>	for (int i = 0; i < SIZE; ++i) {
100	>	ai.lazySet(i, 1);
101	>	assertEquals(1,ai.get(i));
102	>	ai.lazySet(i, 2);
103	>	assertEquals(2,ai.get(i));
104	>	ai.lazySet(i, -3);
105	>	assertEquals(-3,ai.get(i));
106	>	}
107	>	}
108	>
109	>	/**
110	>	* compareAndSet succeeds in changing value if equal to expected else fails
111	>	*/
112	>	public void testCompareAndSet() {
113	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
114		for (int i = 0; i < SIZE; ++i) {
115		ai.set(i, 1);
116		assertTrue(ai.compareAndSet(i, 1,2));
117		assertTrue(ai.compareAndSet(i, 2,-4));
118		assertEquals(-4,ai.get(i));
119		assertFalse(ai.compareAndSet(i, -5,7));
120	<	assertFalse((7 == ai.get(i)));
120	>	assertEquals(-4,ai.get(i));
121		assertTrue(ai.compareAndSet(i, -4,7));
122		assertEquals(7,ai.get(i));
123		}
124		}
125
126		/**
127	<	*
127	>	* compareAndSet in one thread enables another waiting for value
128	>	* to succeed
129	>	*/
130	>	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
131	>	final AtomicLongArray a = new AtomicLongArray(1);
132	>	a.set(0, 1);
133	>	Thread t = new Thread(new CheckedRunnable() {
134	>	public void realRun() {
135	>	while (!a.compareAndSet(0, 2, 3))
136	>	Thread.yield();
137	>	}});
138	>
139	>	t.start();
140	>	assertTrue(a.compareAndSet(0, 1, 2));
141	>	t.join(LONG_DELAY_MS);
142	>	assertFalse(t.isAlive());
143	>	assertEquals(a.get(0), 3);
144	>	}
145	>
146	>	/**
147	>	* repeated weakCompareAndSet succeeds in changing value when equal
148	>	* to expected
149		*/
150	<	public void testWeakCompareAndSet(){
151	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
150	>	public void testWeakCompareAndSet() {
151	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
152		for (int i = 0; i < SIZE; ++i) {
153		ai.set(i, 1);
154	<	while(!ai.weakCompareAndSet(i, 1,2));
155	<	while(!ai.weakCompareAndSet(i, 2,-4));
154	>	while (!ai.weakCompareAndSet(i, 1,2));
155	>	while (!ai.weakCompareAndSet(i, 2,-4));
156		assertEquals(-4,ai.get(i));
157	<	while(!ai.weakCompareAndSet(i, -4,7));
157	>	while (!ai.weakCompareAndSet(i, -4,7));
158		assertEquals(7,ai.get(i));
159		}
160		}
161
162		/**
163	<	*
163	>	* getAndSet returns previous value and sets to given value at given index
164		*/
165	<	public void testGetAndSet(){
166	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
165	>	public void testGetAndSet() {
166	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
167		for (int i = 0; i < SIZE; ++i) {
168		ai.set(i, 1);
169		assertEquals(1,ai.getAndSet(i,0));
#	Line 87 | Line 173 | public class AtomicLongArrayTest extends
173		}
174
175		/**
176	<	*
176	>	* getAndAdd returns previous value and adds given value
177		*/
178	<	public void testGetAndAdd(){
179	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
178	>	public void testGetAndAdd() {
179	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
180		for (int i = 0; i < SIZE; ++i) {
181		ai.set(i, 1);
182		assertEquals(1,ai.getAndAdd(i,2));
#	Line 101 | Line 187 | public class AtomicLongArrayTest extends
187		}
188
189		/**
190	<	*
190	>	* getAndDecrement returns previous value and decrements
191		*/
192	<	public void testGetAndDecrement(){
193	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
192	>	public void testGetAndDecrement() {
193	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
194		for (int i = 0; i < SIZE; ++i) {
195		ai.set(i, 1);
196		assertEquals(1,ai.getAndDecrement(i));
#	Line 114 | Line 200 | public class AtomicLongArrayTest extends
200		}
201
202		/**
203	<	*
203	>	* getAndIncrement returns previous value and increments
204		*/
205	<	public void testGetAndIncrement(){
206	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
205	>	public void testGetAndIncrement() {
206	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
207		for (int i = 0; i < SIZE; ++i) {
208		ai.set(i, 1);
209		assertEquals(1,ai.getAndIncrement(i));
#	Line 131 | Line 217 | public class AtomicLongArrayTest extends
217		}
218
219		/**
220	<	*
220	>	* addAndGet adds given value to current, and returns current value
221		*/
222		public void testAddAndGet() {
223	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
223	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
224		for (int i = 0; i < SIZE; ++i) {
225		ai.set(i, 1);
226		assertEquals(3,ai.addAndGet(i,2));
#	Line 145 | Line 231 | public class AtomicLongArrayTest extends
231		}
232
233		/**
234	<	*
234	>	* decrementAndGet decrements and returns current value
235		*/
236	<	public void testDecrementAndGet(){
237	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
236	>	public void testDecrementAndGet() {
237	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
238		for (int i = 0; i < SIZE; ++i) {
239		ai.set(i, 1);
240		assertEquals(0,ai.decrementAndGet(i));
#	Line 159 | Line 245 | public class AtomicLongArrayTest extends
245		}
246
247		/**
248	<	*
248	>	* incrementAndGet increments and returns current value
249		*/
250		public void testIncrementAndGet() {
251	<	AtomicLongArray ai = new AtomicLongArray(SIZE);
251	>	AtomicLongArray ai = new AtomicLongArray(SIZE);
252		for (int i = 0; i < SIZE; ++i) {
253		ai.set(i, 1);
254		assertEquals(2,ai.incrementAndGet(i));
#	Line 176 | Line 262 | public class AtomicLongArrayTest extends
262		}
263
264		static final long COUNTDOWN = 100000;
265	<
266	<	class Counter implements Runnable {
265	>
266	>	class Counter extends CheckedRunnable {
267		final AtomicLongArray ai;
268		volatile long counts;
269		Counter(AtomicLongArray a) { ai = a; }
270	<	public void run() {
270	>	public void realRun() {
271		for (;;) {
272		boolean done = true;
273		for (int i = 0; i < ai.length(); ++i) {
274		long v = ai.get(i);
275	<	threadAssertTrue(v >= 0);
275	>	assertTrue(v >= 0);
276		if (v != 0) {
277		done = false;
278		if (ai.compareAndSet(i, v, v-1))
#	Line 200 | Line 286 | public class AtomicLongArrayTest extends
286		}
287
288		/**
289	<	*
289	>	* Multiple threads using same array of counters successfully
290	>	* update a number of times equal to total count
291		*/
292	<	public void testCountingInMultipleThreads() {
293	<	try {
294	<	final AtomicLongArray ai = new AtomicLongArray(SIZE);
295	<	for (int i = 0; i < SIZE; ++i)
296	<	ai.set(i, COUNTDOWN);
297	<	Counter c1 = new Counter(ai);
298	<	Counter c2 = new Counter(ai);
299	<	Thread t1 = new Thread(c1);
300	<	Thread t2 = new Thread(c2);
301	<	t1.start();
302	<	t2.start();
303	<	t1.join();
304	<	t2.join();
218	<	assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
219	<	}
220	<	catch(InterruptedException ie) {
221	<	unexpectedException();
222	<	}
292	>	public void testCountingInMultipleThreads() throws InterruptedException {
293	>	final AtomicLongArray ai = new AtomicLongArray(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
307		/**
308	<	*
309	<	*/
310	<	public void testSerialization() {
311	<	AtomicLongArray l = new AtomicLongArray(SIZE);
312	<	for (int i = 0; i < SIZE; ++i)
313	<	l.set(i, -i);
314	<
315	<	try {
316	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
317	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
318	<	out.writeObject(l);
237	<	out.close();
238	<
239	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
240	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
241	<	AtomicLongArray r = (AtomicLongArray) in.readObject();
242	<	for (int i = 0; i < SIZE; ++i) {
243	<	assertEquals(l.get(i), r.get(i));
244	<	}
245	<	} catch(Exception e){
246	<	unexpectedException();
308	>	* a deserialized serialized array holds same values
309	>	*/
310	>	public void testSerialization() throws Exception {
311	>	AtomicLongArray x = new AtomicLongArray(SIZE);
312	>	for (int i = 0; i < SIZE; ++i)
313	>	x.set(i, -i);
314	>	AtomicLongArray y = serialClone(x);
315	>	assertTrue(x != y);
316	>	assertEquals(x.length(), y.length());
317	>	for (int i = 0; i < SIZE; ++i) {
318	>	assertEquals(x.get(i), y.get(i));
319		}
320		}
321
322	+	/**
323	+	* toString returns current value.
324	+	*/
325	+	public void testToString() {
326	+	long[] a = { 17, 3, -42, 99, -7 };
327	+	AtomicLongArray ai = new AtomicLongArray(a);
328	+	assertEquals(Arrays.toString(a), ai.toString());
329	+	}
330
331		}

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