1 |
/* |
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 |
|
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import junit.framework.*; |
10 |
import java.util.Arrays; |
11 |
import java.util.ArrayList; |
12 |
import java.util.Collection; |
13 |
import java.util.Iterator; |
14 |
import java.util.NoSuchElementException; |
15 |
import java.util.Queue; |
16 |
import java.util.concurrent.ArrayBlockingQueue; |
17 |
import java.util.concurrent.BlockingQueue; |
18 |
import java.util.concurrent.CountDownLatch; |
19 |
import java.util.concurrent.Executors; |
20 |
import java.util.concurrent.ExecutorService; |
21 |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
22 |
|
23 |
public class ArrayBlockingQueueTest extends JSR166TestCase { |
24 |
|
25 |
public static class Fair extends BlockingQueueTest { |
26 |
protected BlockingQueue emptyCollection() { |
27 |
return new ArrayBlockingQueue(SIZE, true); |
28 |
} |
29 |
} |
30 |
|
31 |
public static class NonFair extends BlockingQueueTest { |
32 |
protected BlockingQueue emptyCollection() { |
33 |
return new ArrayBlockingQueue(SIZE, false); |
34 |
} |
35 |
} |
36 |
|
37 |
public static void main(String[] args) { |
38 |
junit.textui.TestRunner.run(suite()); |
39 |
} |
40 |
|
41 |
public static Test suite() { |
42 |
return newTestSuite(ArrayBlockingQueueTest.class, |
43 |
new Fair().testSuite(), |
44 |
new NonFair().testSuite()); |
45 |
} |
46 |
|
47 |
/** |
48 |
* Returns a new queue of given size containing consecutive |
49 |
* Integers 0 ... n. |
50 |
*/ |
51 |
private ArrayBlockingQueue<Integer> populatedQueue(int n) { |
52 |
ArrayBlockingQueue<Integer> q = new ArrayBlockingQueue<Integer>(n); |
53 |
assertTrue(q.isEmpty()); |
54 |
for (int i = 0; i < n; i++) |
55 |
assertTrue(q.offer(new Integer(i))); |
56 |
assertFalse(q.isEmpty()); |
57 |
assertEquals(0, q.remainingCapacity()); |
58 |
assertEquals(n, q.size()); |
59 |
return q; |
60 |
} |
61 |
|
62 |
/** |
63 |
* A new queue has the indicated capacity |
64 |
*/ |
65 |
public void testConstructor1() { |
66 |
assertEquals(SIZE, new ArrayBlockingQueue(SIZE).remainingCapacity()); |
67 |
} |
68 |
|
69 |
/** |
70 |
* Constructor throws IAE if capacity argument nonpositive |
71 |
*/ |
72 |
public void testConstructor2() { |
73 |
try { |
74 |
new ArrayBlockingQueue(0); |
75 |
shouldThrow(); |
76 |
} catch (IllegalArgumentException success) {} |
77 |
} |
78 |
|
79 |
/** |
80 |
* Initializing from null Collection throws NPE |
81 |
*/ |
82 |
public void testConstructor3() { |
83 |
try { |
84 |
new ArrayBlockingQueue(1, true, null); |
85 |
shouldThrow(); |
86 |
} catch (NullPointerException success) {} |
87 |
} |
88 |
|
89 |
/** |
90 |
* Initializing from Collection of null elements throws NPE |
91 |
*/ |
92 |
public void testConstructor4() { |
93 |
Collection<Integer> elements = Arrays.asList(new Integer[SIZE]); |
94 |
try { |
95 |
new ArrayBlockingQueue(SIZE, false, elements); |
96 |
shouldThrow(); |
97 |
} catch (NullPointerException success) {} |
98 |
} |
99 |
|
100 |
/** |
101 |
* Initializing from Collection with some null elements throws NPE |
102 |
*/ |
103 |
public void testConstructor5() { |
104 |
Integer[] ints = new Integer[SIZE]; |
105 |
for (int i = 0; i < SIZE-1; ++i) |
106 |
ints[i] = i; |
107 |
Collection<Integer> elements = Arrays.asList(ints); |
108 |
try { |
109 |
new ArrayBlockingQueue(SIZE, false, Arrays.asList(ints)); |
110 |
shouldThrow(); |
111 |
} catch (NullPointerException success) {} |
112 |
} |
113 |
|
114 |
/** |
115 |
* Initializing from too large collection throws IAE |
116 |
*/ |
117 |
public void testConstructor6() { |
118 |
Integer[] ints = new Integer[SIZE]; |
119 |
for (int i = 0; i < SIZE; ++i) |
120 |
ints[i] = i; |
121 |
Collection<Integer> elements = Arrays.asList(ints); |
122 |
try { |
123 |
new ArrayBlockingQueue(SIZE - 1, false, elements); |
124 |
shouldThrow(); |
125 |
} catch (IllegalArgumentException success) {} |
126 |
} |
127 |
|
128 |
/** |
129 |
* Queue contains all elements of collection used to initialize |
130 |
*/ |
131 |
public void testConstructor7() { |
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Integer[] ints = new Integer[SIZE]; |
133 |
for (int i = 0; i < SIZE; ++i) |
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ints[i] = i; |
135 |
Collection<Integer> elements = Arrays.asList(ints); |
136 |
ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE, true, elements); |
137 |
for (int i = 0; i < SIZE; ++i) |
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assertEquals(ints[i], q.poll()); |
139 |
} |
140 |
|
141 |
/** |
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* Queue transitions from empty to full when elements added |
143 |
*/ |
144 |
public void testEmptyFull() { |
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ArrayBlockingQueue q = new ArrayBlockingQueue(2); |
146 |
assertTrue(q.isEmpty()); |
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assertEquals(2, q.remainingCapacity()); |
148 |
q.add(one); |
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assertFalse(q.isEmpty()); |
150 |
q.add(two); |
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assertFalse(q.isEmpty()); |
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assertEquals(0, q.remainingCapacity()); |
153 |
assertFalse(q.offer(three)); |
154 |
} |
155 |
|
156 |
/** |
157 |
* remainingCapacity decreases on add, increases on remove |
158 |
*/ |
159 |
public void testRemainingCapacity() { |
160 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
161 |
for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.remainingCapacity()); |
163 |
assertEquals(SIZE-i, q.size()); |
164 |
q.remove(); |
165 |
} |
166 |
for (int i = 0; i < SIZE; ++i) { |
167 |
assertEquals(SIZE-i, q.remainingCapacity()); |
168 |
assertEquals(i, q.size()); |
169 |
q.add(new Integer(i)); |
170 |
} |
171 |
} |
172 |
|
173 |
/** |
174 |
* Offer succeeds if not full; fails if full |
175 |
*/ |
176 |
public void testOffer() { |
177 |
ArrayBlockingQueue q = new ArrayBlockingQueue(1); |
178 |
assertTrue(q.offer(zero)); |
179 |
assertFalse(q.offer(one)); |
180 |
} |
181 |
|
182 |
/** |
183 |
* add succeeds if not full; throws ISE if full |
184 |
*/ |
185 |
public void testAdd() { |
186 |
try { |
187 |
ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
188 |
for (int i = 0; i < SIZE; ++i) { |
189 |
assertTrue(q.add(new Integer(i))); |
190 |
} |
191 |
assertEquals(0, q.remainingCapacity()); |
192 |
q.add(new Integer(SIZE)); |
193 |
shouldThrow(); |
194 |
} catch (IllegalStateException success) {} |
195 |
} |
196 |
|
197 |
/** |
198 |
* addAll(this) throws IAE |
199 |
*/ |
200 |
public void testAddAllSelf() { |
201 |
try { |
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ArrayBlockingQueue q = populatedQueue(SIZE); |
203 |
q.addAll(q); |
204 |
shouldThrow(); |
205 |
} catch (IllegalArgumentException success) {} |
206 |
} |
207 |
|
208 |
/** |
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* addAll of a collection with any null elements throws NPE after |
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* possibly adding some elements |
211 |
*/ |
212 |
public void testAddAll3() { |
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try { |
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ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
215 |
Integer[] ints = new Integer[SIZE]; |
216 |
for (int i = 0; i < SIZE-1; ++i) |
217 |
ints[i] = new Integer(i); |
218 |
q.addAll(Arrays.asList(ints)); |
219 |
shouldThrow(); |
220 |
} catch (NullPointerException success) {} |
221 |
} |
222 |
|
223 |
/** |
224 |
* addAll throws ISE if not enough room |
225 |
*/ |
226 |
public void testAddAll4() { |
227 |
try { |
228 |
ArrayBlockingQueue q = new ArrayBlockingQueue(1); |
229 |
Integer[] ints = new Integer[SIZE]; |
230 |
for (int i = 0; i < SIZE; ++i) |
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ints[i] = new Integer(i); |
232 |
q.addAll(Arrays.asList(ints)); |
233 |
shouldThrow(); |
234 |
} catch (IllegalStateException success) {} |
235 |
} |
236 |
|
237 |
/** |
238 |
* Queue contains all elements, in traversal order, of successful addAll |
239 |
*/ |
240 |
public void testAddAll5() { |
241 |
Integer[] empty = new Integer[0]; |
242 |
Integer[] ints = new Integer[SIZE]; |
243 |
for (int i = 0; i < SIZE; ++i) |
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ints[i] = new Integer(i); |
245 |
ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
246 |
assertFalse(q.addAll(Arrays.asList(empty))); |
247 |
assertTrue(q.addAll(Arrays.asList(ints))); |
248 |
for (int i = 0; i < SIZE; ++i) |
249 |
assertEquals(ints[i], q.poll()); |
250 |
} |
251 |
|
252 |
/** |
253 |
* all elements successfully put are contained |
254 |
*/ |
255 |
public void testPut() throws InterruptedException { |
256 |
ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
257 |
for (int i = 0; i < SIZE; ++i) { |
258 |
Integer I = new Integer(i); |
259 |
q.put(I); |
260 |
assertTrue(q.contains(I)); |
261 |
} |
262 |
assertEquals(0, q.remainingCapacity()); |
263 |
} |
264 |
|
265 |
/** |
266 |
* put blocks interruptibly if full |
267 |
*/ |
268 |
public void testBlockingPut() throws InterruptedException { |
269 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
270 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
271 |
Thread t = newStartedThread(new CheckedRunnable() { |
272 |
public void realRun() throws InterruptedException { |
273 |
for (int i = 0; i < SIZE; ++i) |
274 |
q.put(i); |
275 |
assertEquals(SIZE, q.size()); |
276 |
assertEquals(0, q.remainingCapacity()); |
277 |
|
278 |
Thread.currentThread().interrupt(); |
279 |
try { |
280 |
q.put(99); |
281 |
shouldThrow(); |
282 |
} catch (InterruptedException success) {} |
283 |
assertFalse(Thread.interrupted()); |
284 |
|
285 |
pleaseInterrupt.countDown(); |
286 |
try { |
287 |
q.put(99); |
288 |
shouldThrow(); |
289 |
} catch (InterruptedException success) {} |
290 |
assertFalse(Thread.interrupted()); |
291 |
}}); |
292 |
|
293 |
await(pleaseInterrupt); |
294 |
assertThreadStaysAlive(t); |
295 |
t.interrupt(); |
296 |
awaitTermination(t); |
297 |
assertEquals(SIZE, q.size()); |
298 |
assertEquals(0, q.remainingCapacity()); |
299 |
} |
300 |
|
301 |
/** |
302 |
* put blocks interruptibly waiting for take when full |
303 |
*/ |
304 |
public void testPutWithTake() throws InterruptedException { |
305 |
final int capacity = 2; |
306 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(capacity); |
307 |
final CountDownLatch pleaseTake = new CountDownLatch(1); |
308 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
309 |
Thread t = newStartedThread(new CheckedRunnable() { |
310 |
public void realRun() throws InterruptedException { |
311 |
for (int i = 0; i < capacity; i++) |
312 |
q.put(i); |
313 |
pleaseTake.countDown(); |
314 |
q.put(86); |
315 |
|
316 |
pleaseInterrupt.countDown(); |
317 |
try { |
318 |
q.put(99); |
319 |
shouldThrow(); |
320 |
} catch (InterruptedException success) {} |
321 |
assertFalse(Thread.interrupted()); |
322 |
}}); |
323 |
|
324 |
await(pleaseTake); |
325 |
assertEquals(0, q.remainingCapacity()); |
326 |
assertEquals(0, q.take()); |
327 |
|
328 |
await(pleaseInterrupt); |
329 |
assertThreadStaysAlive(t); |
330 |
t.interrupt(); |
331 |
awaitTermination(t); |
332 |
assertEquals(0, q.remainingCapacity()); |
333 |
} |
334 |
|
335 |
/** |
336 |
* timed offer times out if full and elements not taken |
337 |
*/ |
338 |
public void testTimedOffer() throws InterruptedException { |
339 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(2); |
340 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
341 |
Thread t = newStartedThread(new CheckedRunnable() { |
342 |
public void realRun() throws InterruptedException { |
343 |
q.put(new Object()); |
344 |
q.put(new Object()); |
345 |
long startTime = System.nanoTime(); |
346 |
assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS)); |
347 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
348 |
pleaseInterrupt.countDown(); |
349 |
try { |
350 |
q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS); |
351 |
shouldThrow(); |
352 |
} catch (InterruptedException success) {} |
353 |
}}); |
354 |
|
355 |
await(pleaseInterrupt); |
356 |
assertThreadStaysAlive(t); |
357 |
t.interrupt(); |
358 |
awaitTermination(t); |
359 |
} |
360 |
|
361 |
/** |
362 |
* take retrieves elements in FIFO order |
363 |
*/ |
364 |
public void testTake() throws InterruptedException { |
365 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
366 |
for (int i = 0; i < SIZE; ++i) { |
367 |
assertEquals(i, q.take()); |
368 |
} |
369 |
} |
370 |
|
371 |
/** |
372 |
* Take removes existing elements until empty, then blocks interruptibly |
373 |
*/ |
374 |
public void testBlockingTake() throws InterruptedException { |
375 |
final ArrayBlockingQueue q = populatedQueue(SIZE); |
376 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
377 |
Thread t = newStartedThread(new CheckedRunnable() { |
378 |
public void realRun() throws InterruptedException { |
379 |
for (int i = 0; i < SIZE; ++i) { |
380 |
assertEquals(i, q.take()); |
381 |
} |
382 |
|
383 |
Thread.currentThread().interrupt(); |
384 |
try { |
385 |
q.take(); |
386 |
shouldThrow(); |
387 |
} catch (InterruptedException success) {} |
388 |
assertFalse(Thread.interrupted()); |
389 |
|
390 |
pleaseInterrupt.countDown(); |
391 |
try { |
392 |
q.take(); |
393 |
shouldThrow(); |
394 |
} catch (InterruptedException success) {} |
395 |
assertFalse(Thread.interrupted()); |
396 |
}}); |
397 |
|
398 |
await(pleaseInterrupt); |
399 |
assertThreadStaysAlive(t); |
400 |
t.interrupt(); |
401 |
awaitTermination(t); |
402 |
} |
403 |
|
404 |
/** |
405 |
* poll succeeds unless empty |
406 |
*/ |
407 |
public void testPoll() { |
408 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
409 |
for (int i = 0; i < SIZE; ++i) { |
410 |
assertEquals(i, q.poll()); |
411 |
} |
412 |
assertNull(q.poll()); |
413 |
} |
414 |
|
415 |
/** |
416 |
* timed poll with zero timeout succeeds when non-empty, else times out |
417 |
*/ |
418 |
public void testTimedPoll0() throws InterruptedException { |
419 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
420 |
for (int i = 0; i < SIZE; ++i) { |
421 |
assertEquals(i, q.poll(0, MILLISECONDS)); |
422 |
} |
423 |
assertNull(q.poll(0, MILLISECONDS)); |
424 |
checkEmpty(q); |
425 |
} |
426 |
|
427 |
/** |
428 |
* timed poll with nonzero timeout succeeds when non-empty, else times out |
429 |
*/ |
430 |
public void testTimedPoll() throws InterruptedException { |
431 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
432 |
for (int i = 0; i < SIZE; ++i) { |
433 |
long startTime = System.nanoTime(); |
434 |
assertEquals(i, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
435 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
436 |
} |
437 |
long startTime = System.nanoTime(); |
438 |
assertNull(q.poll(timeoutMillis(), MILLISECONDS)); |
439 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
440 |
checkEmpty(q); |
441 |
} |
442 |
|
443 |
/** |
444 |
* Interrupted timed poll throws InterruptedException instead of |
445 |
* returning timeout status |
446 |
*/ |
447 |
public void testInterruptedTimedPoll() throws InterruptedException { |
448 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
449 |
final CountDownLatch aboutToWait = new CountDownLatch(1); |
450 |
Thread t = newStartedThread(new CheckedRunnable() { |
451 |
public void realRun() throws InterruptedException { |
452 |
for (int i = 0; i < SIZE; ++i) { |
453 |
long t0 = System.nanoTime(); |
454 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
455 |
assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS); |
456 |
} |
457 |
long t0 = System.nanoTime(); |
458 |
aboutToWait.countDown(); |
459 |
try { |
460 |
q.poll(MEDIUM_DELAY_MS, MILLISECONDS); |
461 |
shouldThrow(); |
462 |
} catch (InterruptedException success) { |
463 |
assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS); |
464 |
} |
465 |
}}); |
466 |
|
467 |
aboutToWait.await(); |
468 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
469 |
t.interrupt(); |
470 |
awaitTermination(t, MEDIUM_DELAY_MS); |
471 |
checkEmpty(q); |
472 |
} |
473 |
|
474 |
/** |
475 |
* peek returns next element, or null if empty |
476 |
*/ |
477 |
public void testPeek() { |
478 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
479 |
for (int i = 0; i < SIZE; ++i) { |
480 |
assertEquals(i, q.peek()); |
481 |
assertEquals(i, q.poll()); |
482 |
assertTrue(q.peek() == null || |
483 |
!q.peek().equals(i)); |
484 |
} |
485 |
assertNull(q.peek()); |
486 |
} |
487 |
|
488 |
/** |
489 |
* element returns next element, or throws NSEE if empty |
490 |
*/ |
491 |
public void testElement() { |
492 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
493 |
for (int i = 0; i < SIZE; ++i) { |
494 |
assertEquals(i, q.element()); |
495 |
assertEquals(i, q.poll()); |
496 |
} |
497 |
try { |
498 |
q.element(); |
499 |
shouldThrow(); |
500 |
} catch (NoSuchElementException success) {} |
501 |
} |
502 |
|
503 |
/** |
504 |
* remove removes next element, or throws NSEE if empty |
505 |
*/ |
506 |
public void testRemove() { |
507 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
508 |
for (int i = 0; i < SIZE; ++i) { |
509 |
assertEquals(i, q.remove()); |
510 |
} |
511 |
try { |
512 |
q.remove(); |
513 |
shouldThrow(); |
514 |
} catch (NoSuchElementException success) {} |
515 |
} |
516 |
|
517 |
/** |
518 |
* contains(x) reports true when elements added but not yet removed |
519 |
*/ |
520 |
public void testContains() { |
521 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
522 |
for (int i = 0; i < SIZE; ++i) { |
523 |
assertTrue(q.contains(new Integer(i))); |
524 |
assertEquals(i, q.poll()); |
525 |
assertFalse(q.contains(new Integer(i))); |
526 |
} |
527 |
} |
528 |
|
529 |
/** |
530 |
* clear removes all elements |
531 |
*/ |
532 |
public void testClear() { |
533 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
534 |
q.clear(); |
535 |
assertTrue(q.isEmpty()); |
536 |
assertEquals(0, q.size()); |
537 |
assertEquals(SIZE, q.remainingCapacity()); |
538 |
q.add(one); |
539 |
assertFalse(q.isEmpty()); |
540 |
assertTrue(q.contains(one)); |
541 |
q.clear(); |
542 |
assertTrue(q.isEmpty()); |
543 |
} |
544 |
|
545 |
/** |
546 |
* containsAll(c) is true when c contains a subset of elements |
547 |
*/ |
548 |
public void testContainsAll() { |
549 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
550 |
ArrayBlockingQueue p = new ArrayBlockingQueue(SIZE); |
551 |
for (int i = 0; i < SIZE; ++i) { |
552 |
assertTrue(q.containsAll(p)); |
553 |
assertFalse(p.containsAll(q)); |
554 |
p.add(new Integer(i)); |
555 |
} |
556 |
assertTrue(p.containsAll(q)); |
557 |
} |
558 |
|
559 |
/** |
560 |
* retainAll(c) retains only those elements of c and reports true if changed |
561 |
*/ |
562 |
public void testRetainAll() { |
563 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
564 |
ArrayBlockingQueue p = populatedQueue(SIZE); |
565 |
for (int i = 0; i < SIZE; ++i) { |
566 |
boolean changed = q.retainAll(p); |
567 |
if (i == 0) |
568 |
assertFalse(changed); |
569 |
else |
570 |
assertTrue(changed); |
571 |
|
572 |
assertTrue(q.containsAll(p)); |
573 |
assertEquals(SIZE-i, q.size()); |
574 |
p.remove(); |
575 |
} |
576 |
} |
577 |
|
578 |
/** |
579 |
* removeAll(c) removes only those elements of c and reports true if changed |
580 |
*/ |
581 |
public void testRemoveAll() { |
582 |
for (int i = 1; i < SIZE; ++i) { |
583 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
584 |
ArrayBlockingQueue p = populatedQueue(i); |
585 |
assertTrue(q.removeAll(p)); |
586 |
assertEquals(SIZE-i, q.size()); |
587 |
for (int j = 0; j < i; ++j) { |
588 |
Integer I = (Integer)(p.remove()); |
589 |
assertFalse(q.contains(I)); |
590 |
} |
591 |
} |
592 |
} |
593 |
|
594 |
/** |
595 |
* toArray contains all elements in FIFO order |
596 |
*/ |
597 |
public void testToArray() { |
598 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
599 |
Object[] o = q.toArray(); |
600 |
for (int i = 0; i < o.length; i++) |
601 |
assertSame(o[i], q.poll()); |
602 |
} |
603 |
|
604 |
/** |
605 |
* toArray(a) contains all elements in FIFO order |
606 |
*/ |
607 |
public void testToArray2() { |
608 |
ArrayBlockingQueue<Integer> q = populatedQueue(SIZE); |
609 |
Integer[] ints = new Integer[SIZE]; |
610 |
Integer[] array = q.toArray(ints); |
611 |
assertSame(ints, array); |
612 |
for (int i = 0; i < ints.length; i++) |
613 |
assertSame(ints[i], q.poll()); |
614 |
} |
615 |
|
616 |
/** |
617 |
* toArray(incompatible array type) throws ArrayStoreException |
618 |
*/ |
619 |
public void testToArray1_BadArg() { |
620 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
621 |
try { |
622 |
q.toArray(new String[10]); |
623 |
shouldThrow(); |
624 |
} catch (ArrayStoreException success) {} |
625 |
} |
626 |
|
627 |
/** |
628 |
* iterator iterates through all elements |
629 |
*/ |
630 |
public void testIterator() throws InterruptedException { |
631 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
632 |
Iterator it = q.iterator(); |
633 |
while (it.hasNext()) { |
634 |
assertEquals(it.next(), q.take()); |
635 |
} |
636 |
} |
637 |
|
638 |
/** |
639 |
* iterator.remove removes current element |
640 |
*/ |
641 |
public void testIteratorRemove() { |
642 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(3); |
643 |
q.add(two); |
644 |
q.add(one); |
645 |
q.add(three); |
646 |
|
647 |
Iterator it = q.iterator(); |
648 |
it.next(); |
649 |
it.remove(); |
650 |
|
651 |
it = q.iterator(); |
652 |
assertSame(it.next(), one); |
653 |
assertSame(it.next(), three); |
654 |
assertFalse(it.hasNext()); |
655 |
} |
656 |
|
657 |
/** |
658 |
* iterator ordering is FIFO |
659 |
*/ |
660 |
public void testIteratorOrdering() { |
661 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(3); |
662 |
q.add(one); |
663 |
q.add(two); |
664 |
q.add(three); |
665 |
|
666 |
assertEquals("queue should be full", 0, q.remainingCapacity()); |
667 |
|
668 |
int k = 0; |
669 |
for (Iterator it = q.iterator(); it.hasNext();) { |
670 |
assertEquals(++k, it.next()); |
671 |
} |
672 |
assertEquals(3, k); |
673 |
} |
674 |
|
675 |
/** |
676 |
* Modifications do not cause iterators to fail |
677 |
*/ |
678 |
public void testWeaklyConsistentIteration() { |
679 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(3); |
680 |
q.add(one); |
681 |
q.add(two); |
682 |
q.add(three); |
683 |
for (Iterator it = q.iterator(); it.hasNext();) { |
684 |
q.remove(); |
685 |
it.next(); |
686 |
} |
687 |
assertEquals(0, q.size()); |
688 |
} |
689 |
|
690 |
/** |
691 |
* toString contains toStrings of elements |
692 |
*/ |
693 |
public void testToString() { |
694 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
695 |
String s = q.toString(); |
696 |
for (int i = 0; i < SIZE; ++i) { |
697 |
assertTrue(s.contains(String.valueOf(i))); |
698 |
} |
699 |
} |
700 |
|
701 |
/** |
702 |
* offer transfers elements across Executor tasks |
703 |
*/ |
704 |
public void testOfferInExecutor() { |
705 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(2); |
706 |
q.add(one); |
707 |
q.add(two); |
708 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
709 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
710 |
executor.execute(new CheckedRunnable() { |
711 |
public void realRun() throws InterruptedException { |
712 |
assertFalse(q.offer(three)); |
713 |
threadsStarted.await(); |
714 |
assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS)); |
715 |
assertEquals(0, q.remainingCapacity()); |
716 |
}}); |
717 |
|
718 |
executor.execute(new CheckedRunnable() { |
719 |
public void realRun() throws InterruptedException { |
720 |
threadsStarted.await(); |
721 |
assertEquals(0, q.remainingCapacity()); |
722 |
assertSame(one, q.take()); |
723 |
}}); |
724 |
|
725 |
joinPool(executor); |
726 |
} |
727 |
|
728 |
/** |
729 |
* timed poll retrieves elements across Executor threads |
730 |
*/ |
731 |
public void testPollInExecutor() { |
732 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(2); |
733 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
734 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
735 |
executor.execute(new CheckedRunnable() { |
736 |
public void realRun() throws InterruptedException { |
737 |
assertNull(q.poll()); |
738 |
threadsStarted.await(); |
739 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
740 |
checkEmpty(q); |
741 |
}}); |
742 |
|
743 |
executor.execute(new CheckedRunnable() { |
744 |
public void realRun() throws InterruptedException { |
745 |
threadsStarted.await(); |
746 |
q.put(one); |
747 |
}}); |
748 |
|
749 |
joinPool(executor); |
750 |
} |
751 |
|
752 |
/** |
753 |
* A deserialized serialized queue has same elements in same order |
754 |
*/ |
755 |
public void testSerialization() throws Exception { |
756 |
Queue x = populatedQueue(SIZE); |
757 |
Queue y = serialClone(x); |
758 |
|
759 |
assertTrue(x != y); |
760 |
assertEquals(x.size(), y.size()); |
761 |
assertEquals(x.toString(), y.toString()); |
762 |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
763 |
while (!x.isEmpty()) { |
764 |
assertFalse(y.isEmpty()); |
765 |
assertEquals(x.remove(), y.remove()); |
766 |
} |
767 |
assertTrue(y.isEmpty()); |
768 |
} |
769 |
|
770 |
/** |
771 |
* drainTo(c) empties queue into another collection c |
772 |
*/ |
773 |
public void testDrainTo() { |
774 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
775 |
ArrayList l = new ArrayList(); |
776 |
q.drainTo(l); |
777 |
assertEquals(0, q.size()); |
778 |
assertEquals(SIZE, l.size()); |
779 |
for (int i = 0; i < SIZE; ++i) |
780 |
assertEquals(l.get(i), new Integer(i)); |
781 |
q.add(zero); |
782 |
q.add(one); |
783 |
assertFalse(q.isEmpty()); |
784 |
assertTrue(q.contains(zero)); |
785 |
assertTrue(q.contains(one)); |
786 |
l.clear(); |
787 |
q.drainTo(l); |
788 |
assertEquals(0, q.size()); |
789 |
assertEquals(2, l.size()); |
790 |
for (int i = 0; i < 2; ++i) |
791 |
assertEquals(l.get(i), new Integer(i)); |
792 |
} |
793 |
|
794 |
/** |
795 |
* drainTo empties full queue, unblocking a waiting put. |
796 |
*/ |
797 |
public void testDrainToWithActivePut() throws InterruptedException { |
798 |
final ArrayBlockingQueue q = populatedQueue(SIZE); |
799 |
Thread t = new Thread(new CheckedRunnable() { |
800 |
public void realRun() throws InterruptedException { |
801 |
q.put(new Integer(SIZE+1)); |
802 |
}}); |
803 |
|
804 |
t.start(); |
805 |
ArrayList l = new ArrayList(); |
806 |
q.drainTo(l); |
807 |
assertTrue(l.size() >= SIZE); |
808 |
for (int i = 0; i < SIZE; ++i) |
809 |
assertEquals(l.get(i), new Integer(i)); |
810 |
t.join(); |
811 |
assertTrue(q.size() + l.size() >= SIZE); |
812 |
} |
813 |
|
814 |
/** |
815 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
816 |
*/ |
817 |
public void testDrainToN() { |
818 |
ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE*2); |
819 |
for (int i = 0; i < SIZE + 2; ++i) { |
820 |
for (int j = 0; j < SIZE; j++) |
821 |
assertTrue(q.offer(new Integer(j))); |
822 |
ArrayList l = new ArrayList(); |
823 |
q.drainTo(l, i); |
824 |
int k = (i < SIZE) ? i : SIZE; |
825 |
assertEquals(k, l.size()); |
826 |
assertEquals(SIZE-k, q.size()); |
827 |
for (int j = 0; j < k; ++j) |
828 |
assertEquals(l.get(j), new Integer(j)); |
829 |
while (q.poll() != null) ; |
830 |
} |
831 |
} |
832 |
|
833 |
} |