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. |
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) { |
22 |
|
/** |
23 |
|
* constructor creates array of given size with all elements zero |
24 |
|
*/ |
25 |
< |
public void testConstructor(){ |
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 |
+ |
shouldThrow(); |
39 |
+ |
} catch (NullPointerException success) {} |
40 |
+ |
} |
41 |
+ |
|
42 |
+ |
/** |
43 |
+ |
* constructor with array is of same size and has all elements |
44 |
+ |
*/ |
45 |
+ |
public void testConstructor2() { |
46 |
+ |
long[] a = { 17L, 3L, -42L, 99L, -7L}; |
47 |
+ |
AtomicLongArray ai = new AtomicLongArray(a); |
48 |
+ |
assertEquals(a.length, ai.length()); |
49 |
+ |
for (int i = 0; i < a.length; ++i) |
50 |
+ |
assertEquals(a[i], ai.get(i)); |
51 |
+ |
} |
52 |
+ |
|
53 |
+ |
/** |
54 |
|
* get and set for out of bound indices throw IndexOutOfBoundsException |
55 |
|
*/ |
56 |
< |
public void testIndexing(){ |
56 |
> |
public void testIndexing() { |
57 |
|
AtomicLongArray ai = new AtomicLongArray(SIZE); |
58 |
|
try { |
59 |
|
ai.get(SIZE); |
60 |
< |
} catch(IndexOutOfBoundsException success){ |
60 |
> |
shouldThrow(); |
61 |
> |
} catch (IndexOutOfBoundsException success) { |
62 |
|
} |
63 |
|
try { |
64 |
|
ai.get(-1); |
65 |
< |
} catch(IndexOutOfBoundsException success){ |
65 |
> |
shouldThrow(); |
66 |
> |
} catch (IndexOutOfBoundsException success) { |
67 |
|
} |
68 |
|
try { |
69 |
|
ai.set(SIZE, 0); |
70 |
< |
} catch(IndexOutOfBoundsException success){ |
70 |
> |
shouldThrow(); |
71 |
> |
} catch (IndexOutOfBoundsException success) { |
72 |
|
} |
73 |
|
try { |
74 |
|
ai.set(-1, 0); |
75 |
< |
} catch(IndexOutOfBoundsException success){ |
75 |
> |
shouldThrow(); |
76 |
> |
} catch (IndexOutOfBoundsException success) { |
77 |
|
} |
78 |
|
} |
79 |
|
|
80 |
|
/** |
81 |
|
* get returns the last value set at index |
82 |
|
*/ |
83 |
< |
public void testGetSet(){ |
84 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
83 |
> |
public void testGetSet() { |
84 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
85 |
|
for (int i = 0; i < SIZE; ++i) { |
86 |
|
ai.set(i, 1); |
87 |
|
assertEquals(1,ai.get(i)); |
93 |
|
} |
94 |
|
|
95 |
|
/** |
96 |
+ |
* get returns the last value lazySet at index by same thread |
97 |
+ |
*/ |
98 |
+ |
public void testGetLazySet() { |
99 |
+ |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
100 |
+ |
for (int i = 0; i < SIZE; ++i) { |
101 |
+ |
ai.lazySet(i, 1); |
102 |
+ |
assertEquals(1,ai.get(i)); |
103 |
+ |
ai.lazySet(i, 2); |
104 |
+ |
assertEquals(2,ai.get(i)); |
105 |
+ |
ai.lazySet(i, -3); |
106 |
+ |
assertEquals(-3,ai.get(i)); |
107 |
+ |
} |
108 |
+ |
} |
109 |
+ |
|
110 |
+ |
/** |
111 |
|
* compareAndSet succeeds in changing value if equal to expected else fails |
112 |
|
*/ |
113 |
< |
public void testCompareAndSet(){ |
114 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
113 |
> |
public void testCompareAndSet() { |
114 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
115 |
|
for (int i = 0; i < SIZE; ++i) { |
116 |
|
ai.set(i, 1); |
117 |
|
assertTrue(ai.compareAndSet(i, 1,2)); |
128 |
|
* compareAndSet in one thread enables another waiting for value |
129 |
|
* to succeed |
130 |
|
*/ |
131 |
< |
public void testCompareAndSetInMultipleThreads() { |
131 |
> |
public void testCompareAndSetInMultipleThreads() throws InterruptedException { |
132 |
|
final AtomicLongArray a = new AtomicLongArray(1); |
133 |
|
a.set(0, 1); |
134 |
< |
Thread t = new Thread(new Runnable() { |
135 |
< |
public void run() { |
136 |
< |
while(!a.compareAndSet(0, 2, 3)) Thread.yield(); |
137 |
< |
}}); |
138 |
< |
try { |
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 |
< |
} |
103 |
< |
catch(Exception e) { |
104 |
< |
unexpectedException(); |
105 |
< |
} |
134 |
> |
Thread t = new Thread(new CheckedRunnable() { |
135 |
> |
public void realRun() { |
136 |
> |
while (!a.compareAndSet(0, 2, 3)) |
137 |
> |
Thread.yield(); |
138 |
> |
}}); |
139 |
> |
|
140 |
> |
t.start(); |
141 |
> |
assertTrue(a.compareAndSet(0, 1, 2)); |
142 |
> |
t.join(LONG_DELAY_MS); |
143 |
> |
assertFalse(t.isAlive()); |
144 |
> |
assertEquals(a.get(0), 3); |
145 |
|
} |
146 |
|
|
147 |
|
/** |
148 |
|
* repeated weakCompareAndSet succeeds in changing value when equal |
149 |
< |
* to expected |
149 |
> |
* to expected |
150 |
|
*/ |
151 |
< |
public void testWeakCompareAndSet(){ |
152 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
151 |
> |
public void testWeakCompareAndSet() { |
152 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
153 |
|
for (int i = 0; i < SIZE; ++i) { |
154 |
|
ai.set(i, 1); |
155 |
< |
while(!ai.weakCompareAndSet(i, 1,2)); |
156 |
< |
while(!ai.weakCompareAndSet(i, 2,-4)); |
155 |
> |
while (!ai.weakCompareAndSet(i, 1,2)); |
156 |
> |
while (!ai.weakCompareAndSet(i, 2,-4)); |
157 |
|
assertEquals(-4,ai.get(i)); |
158 |
< |
while(!ai.weakCompareAndSet(i, -4,7)); |
158 |
> |
while (!ai.weakCompareAndSet(i, -4,7)); |
159 |
|
assertEquals(7,ai.get(i)); |
160 |
|
} |
161 |
|
} |
163 |
|
/** |
164 |
|
* getAndSet returns previous value and sets to given value at given index |
165 |
|
*/ |
166 |
< |
public void testGetAndSet(){ |
167 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
166 |
> |
public void testGetAndSet() { |
167 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
168 |
|
for (int i = 0; i < SIZE; ++i) { |
169 |
|
ai.set(i, 1); |
170 |
|
assertEquals(1,ai.getAndSet(i,0)); |
176 |
|
/** |
177 |
|
* getAndAdd returns previous value and adds given value |
178 |
|
*/ |
179 |
< |
public void testGetAndAdd(){ |
180 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
179 |
> |
public void testGetAndAdd() { |
180 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
181 |
|
for (int i = 0; i < SIZE; ++i) { |
182 |
|
ai.set(i, 1); |
183 |
|
assertEquals(1,ai.getAndAdd(i,2)); |
190 |
|
/** |
191 |
|
* getAndDecrement returns previous value and decrements |
192 |
|
*/ |
193 |
< |
public void testGetAndDecrement(){ |
194 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
193 |
> |
public void testGetAndDecrement() { |
194 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
195 |
|
for (int i = 0; i < SIZE; ++i) { |
196 |
|
ai.set(i, 1); |
197 |
|
assertEquals(1,ai.getAndDecrement(i)); |
203 |
|
/** |
204 |
|
* getAndIncrement returns previous value and increments |
205 |
|
*/ |
206 |
< |
public void testGetAndIncrement(){ |
207 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
206 |
> |
public void testGetAndIncrement() { |
207 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
208 |
|
for (int i = 0; i < SIZE; ++i) { |
209 |
|
ai.set(i, 1); |
210 |
|
assertEquals(1,ai.getAndIncrement(i)); |
221 |
|
* addAndGet adds given value to current, and returns current value |
222 |
|
*/ |
223 |
|
public void testAddAndGet() { |
224 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
224 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
225 |
|
for (int i = 0; i < SIZE; ++i) { |
226 |
|
ai.set(i, 1); |
227 |
|
assertEquals(3,ai.addAndGet(i,2)); |
234 |
|
/** |
235 |
|
* decrementAndGet decrements and returns current value |
236 |
|
*/ |
237 |
< |
public void testDecrementAndGet(){ |
238 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
237 |
> |
public void testDecrementAndGet() { |
238 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
239 |
|
for (int i = 0; i < SIZE; ++i) { |
240 |
|
ai.set(i, 1); |
241 |
|
assertEquals(0,ai.decrementAndGet(i)); |
249 |
|
* incrementAndGet increments and returns current value |
250 |
|
*/ |
251 |
|
public void testIncrementAndGet() { |
252 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
252 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
253 |
|
for (int i = 0; i < SIZE; ++i) { |
254 |
|
ai.set(i, 1); |
255 |
|
assertEquals(2,ai.incrementAndGet(i)); |
263 |
|
} |
264 |
|
|
265 |
|
static final long COUNTDOWN = 100000; |
266 |
< |
|
266 |
> |
|
267 |
|
class Counter implements Runnable { |
268 |
|
final AtomicLongArray ai; |
269 |
|
volatile long counts; |
290 |
|
* Multiple threads using same array of counters successfully |
291 |
|
* update a number of times equal to total count |
292 |
|
*/ |
293 |
< |
public void testCountingInMultipleThreads() { |
294 |
< |
try { |
295 |
< |
final AtomicLongArray ai = new AtomicLongArray(SIZE); |
296 |
< |
for (int i = 0; i < SIZE; ++i) |
297 |
< |
ai.set(i, COUNTDOWN); |
298 |
< |
Counter c1 = new Counter(ai); |
299 |
< |
Counter c2 = new Counter(ai); |
300 |
< |
Thread t1 = new Thread(c1); |
301 |
< |
Thread t2 = new Thread(c2); |
302 |
< |
t1.start(); |
303 |
< |
t2.start(); |
304 |
< |
t1.join(); |
305 |
< |
t2.join(); |
267 |
< |
assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN); |
268 |
< |
} |
269 |
< |
catch(InterruptedException ie) { |
270 |
< |
unexpectedException(); |
271 |
< |
} |
293 |
> |
public void testCountingInMultipleThreads() throws InterruptedException { |
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(); |
305 |
> |
assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN); |
306 |
|
} |
307 |
|
|
308 |
|
/** |
309 |
|
* a deserialized serialized array holds same values |
310 |
|
*/ |
311 |
< |
public void testSerialization() { |
312 |
< |
AtomicLongArray l = new AtomicLongArray(SIZE); |
313 |
< |
for (int i = 0; i < SIZE; ++i) |
311 |
> |
public void testSerialization() throws Exception { |
312 |
> |
AtomicLongArray l = new AtomicLongArray(SIZE); |
313 |
> |
for (int i = 0; i < SIZE; ++i) |
314 |
|
l.set(i, -i); |
315 |
|
|
316 |
< |
try { |
317 |
< |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
318 |
< |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
319 |
< |
out.writeObject(l); |
320 |
< |
out.close(); |
321 |
< |
|
322 |
< |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
323 |
< |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
324 |
< |
AtomicLongArray r = (AtomicLongArray) in.readObject(); |
325 |
< |
for (int i = 0; i < SIZE; ++i) { |
292 |
< |
assertEquals(l.get(i), r.get(i)); |
293 |
< |
} |
294 |
< |
} catch(Exception e){ |
295 |
< |
unexpectedException(); |
316 |
> |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
317 |
> |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
318 |
> |
out.writeObject(l); |
319 |
> |
out.close(); |
320 |
> |
|
321 |
> |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
322 |
> |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
323 |
> |
AtomicLongArray r = (AtomicLongArray) in.readObject(); |
324 |
> |
for (int i = 0; i < SIZE; ++i) { |
325 |
> |
assertEquals(l.get(i), r.get(i)); |
326 |
|
} |
327 |
|
} |
328 |
|
|
329 |
+ |
/** |
330 |
+ |
* toString returns current value. |
331 |
+ |
*/ |
332 |
+ |
public void testToString() { |
333 |
+ |
long[] a = { 17, 3, -42, 99, -7}; |
334 |
+ |
AtomicLongArray ai = new AtomicLongArray(a); |
335 |
+ |
assertEquals(Arrays.toString(a), ai.toString()); |
336 |
+ |
} |
337 |
+ |
|
338 |
|
|
339 |
|
} |