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 JSR166TestCase { |
15 |
|
public static void main (String[] args) { |
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(SIZE); |
27 |
< |
for (int i = 0; i < SIZE; ++i) |
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(SIZE); |
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)); |
90 |
|
} |
91 |
|
} |
92 |
|
|
93 |
+ |
/** |
94 |
+ |
* get returns the last value lazySet at index by same thread |
95 |
+ |
*/ |
96 |
+ |
public void testGetLazySet(){ |
97 |
+ |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
98 |
+ |
for (int i = 0; i < SIZE; ++i) { |
99 |
+ |
ai.lazySet(i, 1); |
100 |
+ |
assertEquals(1,ai.get(i)); |
101 |
+ |
ai.lazySet(i, 2); |
102 |
+ |
assertEquals(2,ai.get(i)); |
103 |
+ |
ai.lazySet(i, -3); |
104 |
+ |
assertEquals(-3,ai.get(i)); |
105 |
+ |
} |
106 |
+ |
} |
107 |
+ |
|
108 |
+ |
/** |
109 |
+ |
* compareAndSet succeeds in changing value if equal to expected else fails |
110 |
+ |
*/ |
111 |
|
public void testCompareAndSet(){ |
112 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
112 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
113 |
|
for (int i = 0; i < SIZE; ++i) { |
114 |
|
ai.set(i, 1); |
115 |
|
assertTrue(ai.compareAndSet(i, 1,2)); |
122 |
|
} |
123 |
|
} |
124 |
|
|
125 |
+ |
/** |
126 |
+ |
* compareAndSet in one thread enables another waiting for value |
127 |
+ |
* to succeed |
128 |
+ |
*/ |
129 |
+ |
public void testCompareAndSetInMultipleThreads() { |
130 |
+ |
final AtomicLongArray a = new AtomicLongArray(1); |
131 |
+ |
a.set(0, 1); |
132 |
+ |
Thread t = new Thread(new Runnable() { |
133 |
+ |
public void run() { |
134 |
+ |
while (!a.compareAndSet(0, 2, 3)) Thread.yield(); |
135 |
+ |
}}); |
136 |
+ |
try { |
137 |
+ |
t.start(); |
138 |
+ |
assertTrue(a.compareAndSet(0, 1, 2)); |
139 |
+ |
t.join(LONG_DELAY_MS); |
140 |
+ |
assertFalse(t.isAlive()); |
141 |
+ |
assertEquals(a.get(0), 3); |
142 |
+ |
} |
143 |
+ |
catch (Exception e) { |
144 |
+ |
unexpectedException(); |
145 |
+ |
} |
146 |
+ |
} |
147 |
+ |
|
148 |
+ |
/** |
149 |
+ |
* repeated weakCompareAndSet succeeds in changing value when equal |
150 |
+ |
* to expected |
151 |
+ |
*/ |
152 |
|
public void testWeakCompareAndSet(){ |
153 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
153 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
154 |
|
for (int i = 0; i < SIZE; ++i) { |
155 |
|
ai.set(i, 1); |
156 |
< |
while(!ai.weakCompareAndSet(i, 1,2)); |
157 |
< |
while(!ai.weakCompareAndSet(i, 2,-4)); |
156 |
> |
while (!ai.weakCompareAndSet(i, 1,2)); |
157 |
> |
while (!ai.weakCompareAndSet(i, 2,-4)); |
158 |
|
assertEquals(-4,ai.get(i)); |
159 |
< |
while(!ai.weakCompareAndSet(i, -4,7)); |
159 |
> |
while (!ai.weakCompareAndSet(i, -4,7)); |
160 |
|
assertEquals(7,ai.get(i)); |
161 |
|
} |
162 |
|
} |
163 |
|
|
164 |
+ |
/** |
165 |
+ |
* getAndSet returns previous value and sets to given value at given index |
166 |
+ |
*/ |
167 |
|
public void testGetAndSet(){ |
168 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
168 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
169 |
|
for (int i = 0; i < SIZE; ++i) { |
170 |
|
ai.set(i, 1); |
171 |
|
assertEquals(1,ai.getAndSet(i,0)); |
174 |
|
} |
175 |
|
} |
176 |
|
|
177 |
+ |
/** |
178 |
+ |
* getAndAdd returns previous value and adds given value |
179 |
+ |
*/ |
180 |
|
public void testGetAndAdd(){ |
181 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
181 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
182 |
|
for (int i = 0; i < SIZE; ++i) { |
183 |
|
ai.set(i, 1); |
184 |
|
assertEquals(1,ai.getAndAdd(i,2)); |
188 |
|
} |
189 |
|
} |
190 |
|
|
191 |
+ |
/** |
192 |
+ |
* getAndDecrement returns previous value and decrements |
193 |
+ |
*/ |
194 |
|
public void testGetAndDecrement(){ |
195 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
195 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
196 |
|
for (int i = 0; i < SIZE; ++i) { |
197 |
|
ai.set(i, 1); |
198 |
|
assertEquals(1,ai.getAndDecrement(i)); |
201 |
|
} |
202 |
|
} |
203 |
|
|
204 |
+ |
/** |
205 |
+ |
* getAndIncrement returns previous value and increments |
206 |
+ |
*/ |
207 |
|
public void testGetAndIncrement(){ |
208 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
208 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
209 |
|
for (int i = 0; i < SIZE; ++i) { |
210 |
|
ai.set(i, 1); |
211 |
|
assertEquals(1,ai.getAndIncrement(i)); |
218 |
|
} |
219 |
|
} |
220 |
|
|
221 |
+ |
/** |
222 |
+ |
* addAndGet adds given value to current, and returns current value |
223 |
+ |
*/ |
224 |
|
public void testAddAndGet() { |
225 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
225 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
226 |
|
for (int i = 0; i < SIZE; ++i) { |
227 |
|
ai.set(i, 1); |
228 |
|
assertEquals(3,ai.addAndGet(i,2)); |
232 |
|
} |
233 |
|
} |
234 |
|
|
235 |
+ |
/** |
236 |
+ |
* decrementAndGet decrements and returns current value |
237 |
+ |
*/ |
238 |
|
public void testDecrementAndGet(){ |
239 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
239 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
240 |
|
for (int i = 0; i < SIZE; ++i) { |
241 |
|
ai.set(i, 1); |
242 |
|
assertEquals(0,ai.decrementAndGet(i)); |
246 |
|
} |
247 |
|
} |
248 |
|
|
249 |
+ |
/** |
250 |
+ |
* incrementAndGet increments and returns current value |
251 |
+ |
*/ |
252 |
|
public void testIncrementAndGet() { |
253 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
253 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
254 |
|
for (int i = 0; i < SIZE; ++i) { |
255 |
|
ai.set(i, 1); |
256 |
|
assertEquals(2,ai.incrementAndGet(i)); |
264 |
|
} |
265 |
|
|
266 |
|
static final long COUNTDOWN = 100000; |
267 |
< |
|
267 |
> |
|
268 |
|
class Counter implements Runnable { |
269 |
|
final AtomicLongArray ai; |
270 |
|
volatile long counts; |
287 |
|
} |
288 |
|
} |
289 |
|
|
290 |
+ |
/** |
291 |
+ |
* Multiple threads using same array of counters successfully |
292 |
+ |
* update a number of times equal to total count |
293 |
+ |
*/ |
294 |
|
public void testCountingInMultipleThreads() { |
295 |
|
try { |
296 |
< |
final AtomicLongArray ai = new AtomicLongArray(SIZE); |
297 |
< |
for (int i = 0; i < SIZE; ++i) |
296 |
> |
final AtomicLongArray ai = new AtomicLongArray(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); |
306 |
|
t2.join(); |
307 |
|
assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN); |
308 |
|
} |
309 |
< |
catch(InterruptedException ie) { |
310 |
< |
fail("unexpected exception"); |
309 |
> |
catch (InterruptedException ie) { |
310 |
> |
unexpectedException(); |
311 |
|
} |
312 |
|
} |
313 |
|
|
314 |
+ |
/** |
315 |
+ |
* a deserialized serialized array holds same values |
316 |
+ |
*/ |
317 |
|
public void testSerialization() { |
318 |
< |
AtomicLongArray l = new AtomicLongArray(SIZE); |
319 |
< |
for (int i = 0; i < SIZE; ++i) |
318 |
> |
AtomicLongArray l = new AtomicLongArray(SIZE); |
319 |
> |
for (int i = 0; i < SIZE; ++i) |
320 |
|
l.set(i, -i); |
321 |
|
|
322 |
|
try { |
331 |
|
for (int i = 0; i < SIZE; ++i) { |
332 |
|
assertEquals(l.get(i), r.get(i)); |
333 |
|
} |
334 |
< |
} catch(Exception e){ |
335 |
< |
e.printStackTrace(); |
208 |
< |
fail("unexpected exception"); |
334 |
> |
} catch (Exception e){ |
335 |
> |
unexpectedException(); |
336 |
|
} |
337 |
|
} |
338 |
|
|
339 |
+ |
/** |
340 |
+ |
* toString returns current value. |
341 |
+ |
*/ |
342 |
+ |
public void testToString() { |
343 |
+ |
long[] a = { 17, 3, -42, 99, -7}; |
344 |
+ |
AtomicLongArray ai = new AtomicLongArray(a); |
345 |
+ |
assertEquals(Arrays.toString(a), ai.toString()); |
346 |
+ |
} |
347 |
+ |
|
348 |
|
|
349 |
|
} |