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/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.*; |
11 |
import java.util.concurrent.*; |
12 |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
13 |
import java.io.*; |
14 |
|
15 |
public class SynchronousQueueTest extends JSR166TestCase { |
16 |
|
17 |
public static void main(String[] args) { |
18 |
junit.textui.TestRunner.run(suite()); |
19 |
} |
20 |
|
21 |
public static Test suite() { |
22 |
return new TestSuite(SynchronousQueueTest.class); |
23 |
} |
24 |
|
25 |
/** |
26 |
* A SynchronousQueue is both empty and full |
27 |
*/ |
28 |
public void testEmptyFull() { |
29 |
SynchronousQueue q = new SynchronousQueue(); |
30 |
assertTrue(q.isEmpty()); |
31 |
assertEquals(0, q.size()); |
32 |
assertEquals(0, q.remainingCapacity()); |
33 |
assertFalse(q.offer(zero)); |
34 |
} |
35 |
|
36 |
/** |
37 |
* A fair SynchronousQueue is both empty and full |
38 |
*/ |
39 |
public void testFairEmptyFull() { |
40 |
SynchronousQueue q = new SynchronousQueue(true); |
41 |
assertTrue(q.isEmpty()); |
42 |
assertEquals(0, q.size()); |
43 |
assertEquals(0, q.remainingCapacity()); |
44 |
assertFalse(q.offer(zero)); |
45 |
} |
46 |
|
47 |
/** |
48 |
* offer(null) throws NPE |
49 |
*/ |
50 |
public void testOfferNull() { |
51 |
try { |
52 |
SynchronousQueue q = new SynchronousQueue(); |
53 |
q.offer(null); |
54 |
shouldThrow(); |
55 |
} catch (NullPointerException success) {} |
56 |
} |
57 |
|
58 |
/** |
59 |
* add(null) throws NPE |
60 |
*/ |
61 |
public void testAddNull() { |
62 |
try { |
63 |
SynchronousQueue q = new SynchronousQueue(); |
64 |
q.add(null); |
65 |
shouldThrow(); |
66 |
} catch (NullPointerException success) {} |
67 |
} |
68 |
|
69 |
/** |
70 |
* offer fails if no active taker |
71 |
*/ |
72 |
public void testOffer() { |
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SynchronousQueue q = new SynchronousQueue(); |
74 |
assertFalse(q.offer(one)); |
75 |
} |
76 |
|
77 |
/** |
78 |
* add throws ISE if no active taker |
79 |
*/ |
80 |
public void testAdd() { |
81 |
try { |
82 |
SynchronousQueue q = new SynchronousQueue(); |
83 |
assertEquals(0, q.remainingCapacity()); |
84 |
q.add(one); |
85 |
shouldThrow(); |
86 |
} catch (IllegalStateException success) {} |
87 |
} |
88 |
|
89 |
/** |
90 |
* addAll(null) throws NPE |
91 |
*/ |
92 |
public void testAddAll1() { |
93 |
try { |
94 |
SynchronousQueue q = new SynchronousQueue(); |
95 |
q.addAll(null); |
96 |
shouldThrow(); |
97 |
} catch (NullPointerException success) {} |
98 |
} |
99 |
|
100 |
/** |
101 |
* addAll(this) throws IAE |
102 |
*/ |
103 |
public void testAddAllSelf() { |
104 |
try { |
105 |
SynchronousQueue q = new SynchronousQueue(); |
106 |
q.addAll(q); |
107 |
shouldThrow(); |
108 |
} catch (IllegalArgumentException success) {} |
109 |
} |
110 |
|
111 |
/** |
112 |
* addAll of a collection with null elements throws NPE |
113 |
*/ |
114 |
public void testAddAll2() { |
115 |
try { |
116 |
SynchronousQueue q = new SynchronousQueue(); |
117 |
Integer[] ints = new Integer[1]; |
118 |
q.addAll(Arrays.asList(ints)); |
119 |
shouldThrow(); |
120 |
} catch (NullPointerException success) {} |
121 |
} |
122 |
/** |
123 |
* addAll throws ISE if no active taker |
124 |
*/ |
125 |
public void testAddAll4() { |
126 |
try { |
127 |
SynchronousQueue q = new SynchronousQueue(); |
128 |
Integer[] ints = new Integer[1]; |
129 |
for (int i = 0; i < 1; ++i) |
130 |
ints[i] = new Integer(i); |
131 |
q.addAll(Arrays.asList(ints)); |
132 |
shouldThrow(); |
133 |
} catch (IllegalStateException success) {} |
134 |
} |
135 |
|
136 |
/** |
137 |
* put(null) throws NPE |
138 |
*/ |
139 |
public void testPutNull() throws InterruptedException { |
140 |
try { |
141 |
SynchronousQueue q = new SynchronousQueue(); |
142 |
q.put(null); |
143 |
shouldThrow(); |
144 |
} catch (NullPointerException success) {} |
145 |
} |
146 |
|
147 |
/** |
148 |
* put blocks interruptibly if no active taker |
149 |
*/ |
150 |
public void testBlockingPut() throws InterruptedException { |
151 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
152 |
public void realRun() throws InterruptedException { |
153 |
SynchronousQueue q = new SynchronousQueue(); |
154 |
q.put(zero); |
155 |
}}); |
156 |
|
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t.start(); |
158 |
Thread.sleep(SHORT_DELAY_MS); |
159 |
t.interrupt(); |
160 |
t.join(); |
161 |
} |
162 |
|
163 |
/** |
164 |
* put blocks waiting for take |
165 |
*/ |
166 |
public void testPutWithTake() throws InterruptedException { |
167 |
final SynchronousQueue q = new SynchronousQueue(); |
168 |
Thread t = new Thread(new CheckedRunnable() { |
169 |
public void realRun() throws InterruptedException { |
170 |
int added = 0; |
171 |
try { |
172 |
while (true) { |
173 |
q.put(added); |
174 |
++added; |
175 |
} |
176 |
} catch (InterruptedException success) { |
177 |
assertTrue(added == 1); |
178 |
} |
179 |
}}); |
180 |
|
181 |
t.start(); |
182 |
Thread.sleep(SHORT_DELAY_MS); |
183 |
assertEquals(0, q.take()); |
184 |
Thread.sleep(SHORT_DELAY_MS); |
185 |
t.interrupt(); |
186 |
t.join(); |
187 |
} |
188 |
|
189 |
/** |
190 |
* timed offer times out if elements not taken |
191 |
*/ |
192 |
public void testTimedOffer() throws InterruptedException { |
193 |
final SynchronousQueue q = new SynchronousQueue(); |
194 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
195 |
public void realRun() throws InterruptedException { |
196 |
assertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS)); |
197 |
q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS); |
198 |
}}); |
199 |
|
200 |
t.start(); |
201 |
Thread.sleep(SMALL_DELAY_MS); |
202 |
t.interrupt(); |
203 |
t.join(); |
204 |
} |
205 |
|
206 |
|
207 |
/** |
208 |
* take blocks interruptibly when empty |
209 |
*/ |
210 |
public void testTakeFromEmpty() throws InterruptedException { |
211 |
final SynchronousQueue q = new SynchronousQueue(); |
212 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
213 |
public void realRun() throws InterruptedException { |
214 |
q.take(); |
215 |
}}); |
216 |
|
217 |
t.start(); |
218 |
Thread.sleep(SHORT_DELAY_MS); |
219 |
t.interrupt(); |
220 |
t.join(); |
221 |
} |
222 |
|
223 |
|
224 |
/** |
225 |
* put blocks interruptibly if no active taker |
226 |
*/ |
227 |
public void testFairBlockingPut() throws InterruptedException { |
228 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
229 |
public void realRun() throws InterruptedException { |
230 |
SynchronousQueue q = new SynchronousQueue(true); |
231 |
q.put(zero); |
232 |
}}); |
233 |
|
234 |
t.start(); |
235 |
Thread.sleep(SHORT_DELAY_MS); |
236 |
t.interrupt(); |
237 |
t.join(); |
238 |
} |
239 |
|
240 |
/** |
241 |
* put blocks waiting for take |
242 |
*/ |
243 |
public void testFairPutWithTake() throws InterruptedException { |
244 |
final SynchronousQueue q = new SynchronousQueue(true); |
245 |
Thread t = new Thread(new CheckedRunnable() { |
246 |
public void realRun() throws InterruptedException { |
247 |
int added = 0; |
248 |
try { |
249 |
while (true) { |
250 |
q.put(added); |
251 |
++added; |
252 |
} |
253 |
} catch (InterruptedException success) { |
254 |
assertTrue(added == 1); |
255 |
} |
256 |
}}); |
257 |
|
258 |
t.start(); |
259 |
Thread.sleep(SHORT_DELAY_MS); |
260 |
assertEquals(0, q.take()); |
261 |
Thread.sleep(SHORT_DELAY_MS); |
262 |
t.interrupt(); |
263 |
t.join(); |
264 |
} |
265 |
|
266 |
/** |
267 |
* timed offer times out if elements not taken |
268 |
*/ |
269 |
public void testFairTimedOffer() throws InterruptedException { |
270 |
final SynchronousQueue q = new SynchronousQueue(true); |
271 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
272 |
public void realRun() throws InterruptedException { |
273 |
assertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS)); |
274 |
q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS); |
275 |
}}); |
276 |
|
277 |
t.start(); |
278 |
Thread.sleep(SMALL_DELAY_MS); |
279 |
t.interrupt(); |
280 |
t.join(); |
281 |
} |
282 |
|
283 |
|
284 |
/** |
285 |
* take blocks interruptibly when empty |
286 |
*/ |
287 |
public void testFairTakeFromEmpty() throws InterruptedException { |
288 |
final SynchronousQueue q = new SynchronousQueue(true); |
289 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
290 |
public void realRun() throws InterruptedException { |
291 |
q.take(); |
292 |
}}); |
293 |
|
294 |
t.start(); |
295 |
Thread.sleep(SHORT_DELAY_MS); |
296 |
t.interrupt(); |
297 |
t.join(); |
298 |
} |
299 |
|
300 |
/** |
301 |
* poll fails unless active taker |
302 |
*/ |
303 |
public void testPoll() { |
304 |
SynchronousQueue q = new SynchronousQueue(); |
305 |
assertNull(q.poll()); |
306 |
} |
307 |
|
308 |
/** |
309 |
* timed pool with zero timeout times out if no active taker |
310 |
*/ |
311 |
public void testTimedPoll0() throws InterruptedException { |
312 |
SynchronousQueue q = new SynchronousQueue(); |
313 |
assertNull(q.poll(0, MILLISECONDS)); |
314 |
} |
315 |
|
316 |
/** |
317 |
* timed pool with nonzero timeout times out if no active taker |
318 |
*/ |
319 |
public void testTimedPoll() throws InterruptedException { |
320 |
SynchronousQueue q = new SynchronousQueue(); |
321 |
assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS)); |
322 |
} |
323 |
|
324 |
/** |
325 |
* Interrupted timed poll throws InterruptedException instead of |
326 |
* returning timeout status |
327 |
*/ |
328 |
public void testInterruptedTimedPoll() throws InterruptedException { |
329 |
final SynchronousQueue q = new SynchronousQueue(); |
330 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
331 |
public void realRun() throws InterruptedException { |
332 |
q.poll(SMALL_DELAY_MS, MILLISECONDS); |
333 |
}}); |
334 |
|
335 |
t.start(); |
336 |
Thread.sleep(SHORT_DELAY_MS); |
337 |
t.interrupt(); |
338 |
t.join(); |
339 |
} |
340 |
|
341 |
/** |
342 |
* timed poll before a delayed offer fails; after offer succeeds; |
343 |
* on interruption throws |
344 |
*/ |
345 |
public void testTimedPollWithOffer() throws InterruptedException { |
346 |
final SynchronousQueue q = new SynchronousQueue(); |
347 |
Thread t = new Thread(new CheckedRunnable() { |
348 |
public void realRun() throws InterruptedException { |
349 |
assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS)); |
350 |
assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
351 |
try { |
352 |
q.poll(LONG_DELAY_MS, MILLISECONDS); |
353 |
shouldThrow(); |
354 |
} catch (InterruptedException success) {} |
355 |
}}); |
356 |
|
357 |
t.start(); |
358 |
Thread.sleep(SMALL_DELAY_MS); |
359 |
assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS)); |
360 |
t.interrupt(); |
361 |
t.join(); |
362 |
} |
363 |
|
364 |
/** |
365 |
* Interrupted timed poll throws InterruptedException instead of |
366 |
* returning timeout status |
367 |
*/ |
368 |
public void testFairInterruptedTimedPoll() throws InterruptedException { |
369 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
370 |
public void realRun() throws InterruptedException { |
371 |
SynchronousQueue q = new SynchronousQueue(true); |
372 |
q.poll(SMALL_DELAY_MS, MILLISECONDS); |
373 |
}}); |
374 |
|
375 |
t.start(); |
376 |
Thread.sleep(SHORT_DELAY_MS); |
377 |
t.interrupt(); |
378 |
t.join(); |
379 |
} |
380 |
|
381 |
/** |
382 |
* timed poll before a delayed offer fails; after offer succeeds; |
383 |
* on interruption throws |
384 |
*/ |
385 |
public void testFairTimedPollWithOffer() throws InterruptedException { |
386 |
final SynchronousQueue q = new SynchronousQueue(true); |
387 |
Thread t = new Thread(new CheckedRunnable() { |
388 |
public void realRun() throws InterruptedException { |
389 |
assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS)); |
390 |
assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
391 |
try { |
392 |
q.poll(LONG_DELAY_MS, MILLISECONDS); |
393 |
threadShouldThrow(); |
394 |
} catch (InterruptedException success) {} |
395 |
}}); |
396 |
|
397 |
t.start(); |
398 |
Thread.sleep(SMALL_DELAY_MS); |
399 |
assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS)); |
400 |
t.interrupt(); |
401 |
t.join(); |
402 |
} |
403 |
|
404 |
|
405 |
/** |
406 |
* peek returns null |
407 |
*/ |
408 |
public void testPeek() { |
409 |
SynchronousQueue q = new SynchronousQueue(); |
410 |
assertNull(q.peek()); |
411 |
} |
412 |
|
413 |
/** |
414 |
* element throws NSEE |
415 |
*/ |
416 |
public void testElement() { |
417 |
SynchronousQueue q = new SynchronousQueue(); |
418 |
try { |
419 |
q.element(); |
420 |
shouldThrow(); |
421 |
} catch (NoSuchElementException success) {} |
422 |
} |
423 |
|
424 |
/** |
425 |
* remove throws NSEE if no active taker |
426 |
*/ |
427 |
public void testRemove() { |
428 |
SynchronousQueue q = new SynchronousQueue(); |
429 |
try { |
430 |
q.remove(); |
431 |
shouldThrow(); |
432 |
} catch (NoSuchElementException success) {} |
433 |
} |
434 |
|
435 |
/** |
436 |
* remove(x) returns false |
437 |
*/ |
438 |
public void testRemoveElement() { |
439 |
SynchronousQueue q = new SynchronousQueue(); |
440 |
assertFalse(q.remove(zero)); |
441 |
assertTrue(q.isEmpty()); |
442 |
} |
443 |
|
444 |
/** |
445 |
* contains returns false |
446 |
*/ |
447 |
public void testContains() { |
448 |
SynchronousQueue q = new SynchronousQueue(); |
449 |
assertFalse(q.contains(zero)); |
450 |
} |
451 |
|
452 |
/** |
453 |
* clear ensures isEmpty |
454 |
*/ |
455 |
public void testClear() { |
456 |
SynchronousQueue q = new SynchronousQueue(); |
457 |
q.clear(); |
458 |
assertTrue(q.isEmpty()); |
459 |
} |
460 |
|
461 |
/** |
462 |
* containsAll returns false unless empty |
463 |
*/ |
464 |
public void testContainsAll() { |
465 |
SynchronousQueue q = new SynchronousQueue(); |
466 |
Integer[] empty = new Integer[0]; |
467 |
assertTrue(q.containsAll(Arrays.asList(empty))); |
468 |
Integer[] ints = new Integer[1]; ints[0] = zero; |
469 |
assertFalse(q.containsAll(Arrays.asList(ints))); |
470 |
} |
471 |
|
472 |
/** |
473 |
* retainAll returns false |
474 |
*/ |
475 |
public void testRetainAll() { |
476 |
SynchronousQueue q = new SynchronousQueue(); |
477 |
Integer[] empty = new Integer[0]; |
478 |
assertFalse(q.retainAll(Arrays.asList(empty))); |
479 |
Integer[] ints = new Integer[1]; ints[0] = zero; |
480 |
assertFalse(q.retainAll(Arrays.asList(ints))); |
481 |
} |
482 |
|
483 |
/** |
484 |
* removeAll returns false |
485 |
*/ |
486 |
public void testRemoveAll() { |
487 |
SynchronousQueue q = new SynchronousQueue(); |
488 |
Integer[] empty = new Integer[0]; |
489 |
assertFalse(q.removeAll(Arrays.asList(empty))); |
490 |
Integer[] ints = new Integer[1]; ints[0] = zero; |
491 |
assertFalse(q.containsAll(Arrays.asList(ints))); |
492 |
} |
493 |
|
494 |
|
495 |
/** |
496 |
* toArray is empty |
497 |
*/ |
498 |
public void testToArray() { |
499 |
SynchronousQueue q = new SynchronousQueue(); |
500 |
Object[] o = q.toArray(); |
501 |
assertEquals(o.length, 0); |
502 |
} |
503 |
|
504 |
/** |
505 |
* toArray(a) is nulled at position 0 |
506 |
*/ |
507 |
public void testToArray2() { |
508 |
SynchronousQueue q = new SynchronousQueue(); |
509 |
Integer[] ints = new Integer[1]; |
510 |
assertNull(ints[0]); |
511 |
} |
512 |
|
513 |
/** |
514 |
* toArray(null) throws NPE |
515 |
*/ |
516 |
public void testToArray_BadArg() { |
517 |
SynchronousQueue q = new SynchronousQueue(); |
518 |
try { |
519 |
Object o[] = q.toArray(null); |
520 |
shouldThrow(); |
521 |
} catch (NullPointerException success) {} |
522 |
} |
523 |
|
524 |
|
525 |
/** |
526 |
* iterator does not traverse any elements |
527 |
*/ |
528 |
public void testIterator() { |
529 |
SynchronousQueue q = new SynchronousQueue(); |
530 |
Iterator it = q.iterator(); |
531 |
assertFalse(it.hasNext()); |
532 |
try { |
533 |
Object x = it.next(); |
534 |
shouldThrow(); |
535 |
} catch (NoSuchElementException success) {} |
536 |
} |
537 |
|
538 |
/** |
539 |
* iterator remove throws ISE |
540 |
*/ |
541 |
public void testIteratorRemove() { |
542 |
SynchronousQueue q = new SynchronousQueue(); |
543 |
Iterator it = q.iterator(); |
544 |
try { |
545 |
it.remove(); |
546 |
shouldThrow(); |
547 |
} catch (IllegalStateException success) {} |
548 |
} |
549 |
|
550 |
/** |
551 |
* toString returns a non-null string |
552 |
*/ |
553 |
public void testToString() { |
554 |
SynchronousQueue q = new SynchronousQueue(); |
555 |
String s = q.toString(); |
556 |
assertNotNull(s); |
557 |
} |
558 |
|
559 |
|
560 |
/** |
561 |
* offer transfers elements across Executor tasks |
562 |
*/ |
563 |
public void testOfferInExecutor() { |
564 |
final SynchronousQueue q = new SynchronousQueue(); |
565 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
566 |
|
567 |
executor.execute(new CheckedRunnable() { |
568 |
public void realRun() throws InterruptedException { |
569 |
assertFalse(q.offer(one)); |
570 |
assertTrue(q.offer(one, MEDIUM_DELAY_MS, MILLISECONDS)); |
571 |
assertEquals(0, q.remainingCapacity()); |
572 |
}}); |
573 |
|
574 |
executor.execute(new CheckedRunnable() { |
575 |
public void realRun() throws InterruptedException { |
576 |
Thread.sleep(SMALL_DELAY_MS); |
577 |
assertSame(one, q.take()); |
578 |
}}); |
579 |
|
580 |
joinPool(executor); |
581 |
} |
582 |
|
583 |
/** |
584 |
* poll retrieves elements across Executor threads |
585 |
*/ |
586 |
public void testPollInExecutor() { |
587 |
final SynchronousQueue q = new SynchronousQueue(); |
588 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
589 |
executor.execute(new CheckedRunnable() { |
590 |
public void realRun() throws InterruptedException { |
591 |
assertNull(q.poll()); |
592 |
assertSame(one, q.poll(MEDIUM_DELAY_MS, MILLISECONDS)); |
593 |
assertTrue(q.isEmpty()); |
594 |
}}); |
595 |
|
596 |
executor.execute(new CheckedRunnable() { |
597 |
public void realRun() throws InterruptedException { |
598 |
Thread.sleep(SHORT_DELAY_MS); |
599 |
q.put(one); |
600 |
}}); |
601 |
|
602 |
joinPool(executor); |
603 |
} |
604 |
|
605 |
/** |
606 |
* a deserialized serialized queue is usable |
607 |
*/ |
608 |
public void testSerialization() throws Exception { |
609 |
SynchronousQueue q = new SynchronousQueue(); |
610 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
611 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
612 |
out.writeObject(q); |
613 |
out.close(); |
614 |
|
615 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
616 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
617 |
SynchronousQueue r = (SynchronousQueue)in.readObject(); |
618 |
assertEquals(q.size(), r.size()); |
619 |
while (!q.isEmpty()) |
620 |
assertEquals(q.remove(), r.remove()); |
621 |
} |
622 |
|
623 |
/** |
624 |
* drainTo(null) throws NPE |
625 |
*/ |
626 |
public void testDrainToNull() { |
627 |
SynchronousQueue q = new SynchronousQueue(); |
628 |
try { |
629 |
q.drainTo(null); |
630 |
shouldThrow(); |
631 |
} catch (NullPointerException success) {} |
632 |
} |
633 |
|
634 |
/** |
635 |
* drainTo(this) throws IAE |
636 |
*/ |
637 |
public void testDrainToSelf() { |
638 |
SynchronousQueue q = new SynchronousQueue(); |
639 |
try { |
640 |
q.drainTo(q); |
641 |
shouldThrow(); |
642 |
} catch (IllegalArgumentException success) {} |
643 |
} |
644 |
|
645 |
/** |
646 |
* drainTo(c) of empty queue doesn't transfer elements |
647 |
*/ |
648 |
public void testDrainTo() { |
649 |
SynchronousQueue q = new SynchronousQueue(); |
650 |
ArrayList l = new ArrayList(); |
651 |
q.drainTo(l); |
652 |
assertEquals(q.size(), 0); |
653 |
assertEquals(l.size(), 0); |
654 |
} |
655 |
|
656 |
/** |
657 |
* drainTo empties queue, unblocking a waiting put. |
658 |
*/ |
659 |
public void testDrainToWithActivePut() throws InterruptedException { |
660 |
final SynchronousQueue q = new SynchronousQueue(); |
661 |
Thread t = new Thread(new CheckedRunnable() { |
662 |
public void realRun() throws InterruptedException { |
663 |
q.put(new Integer(1)); |
664 |
}}); |
665 |
|
666 |
t.start(); |
667 |
ArrayList l = new ArrayList(); |
668 |
Thread.sleep(SHORT_DELAY_MS); |
669 |
q.drainTo(l); |
670 |
assertTrue(l.size() <= 1); |
671 |
if (l.size() > 0) |
672 |
assertEquals(l.get(0), new Integer(1)); |
673 |
t.join(); |
674 |
assertTrue(l.size() <= 1); |
675 |
} |
676 |
|
677 |
/** |
678 |
* drainTo(null, n) throws NPE |
679 |
*/ |
680 |
public void testDrainToNullN() { |
681 |
SynchronousQueue q = new SynchronousQueue(); |
682 |
try { |
683 |
q.drainTo(null, 0); |
684 |
shouldThrow(); |
685 |
} catch (NullPointerException success) {} |
686 |
} |
687 |
|
688 |
/** |
689 |
* drainTo(this, n) throws IAE |
690 |
*/ |
691 |
public void testDrainToSelfN() { |
692 |
SynchronousQueue q = new SynchronousQueue(); |
693 |
try { |
694 |
q.drainTo(q, 0); |
695 |
shouldThrow(); |
696 |
} catch (IllegalArgumentException success) {} |
697 |
} |
698 |
|
699 |
/** |
700 |
* drainTo(c, n) empties up to n elements of queue into c |
701 |
*/ |
702 |
public void testDrainToN() throws InterruptedException { |
703 |
final SynchronousQueue q = new SynchronousQueue(); |
704 |
Thread t1 = new Thread(new CheckedRunnable() { |
705 |
public void realRun() throws InterruptedException { |
706 |
q.put(one); |
707 |
}}); |
708 |
|
709 |
Thread t2 = new Thread(new CheckedRunnable() { |
710 |
public void realRun() throws InterruptedException { |
711 |
q.put(two); |
712 |
}}); |
713 |
|
714 |
t1.start(); |
715 |
t2.start(); |
716 |
ArrayList l = new ArrayList(); |
717 |
Thread.sleep(SHORT_DELAY_MS); |
718 |
q.drainTo(l, 1); |
719 |
assertTrue(l.size() == 1); |
720 |
q.drainTo(l, 1); |
721 |
assertTrue(l.size() == 2); |
722 |
assertTrue(l.contains(one)); |
723 |
assertTrue(l.contains(two)); |
724 |
t1.join(); |
725 |
t2.join(); |
726 |
} |
727 |
|
728 |
} |