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 LinkedBlockingQueueTest extends JSR166TestCase { |
16 |
|
17 |
public static class Unbounded extends BlockingQueueTest { |
18 |
protected BlockingQueue emptyCollection() { |
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return new LinkedBlockingQueue(); |
20 |
} |
21 |
} |
22 |
|
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public static class Bounded extends BlockingQueueTest { |
24 |
protected BlockingQueue emptyCollection() { |
25 |
return new LinkedBlockingQueue(20); |
26 |
} |
27 |
} |
28 |
|
29 |
public static void main(String[] args) { |
30 |
junit.textui.TestRunner.run(suite()); |
31 |
} |
32 |
|
33 |
public static Test suite() { |
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return newTestSuite(LinkedBlockingQueueTest.class, |
35 |
new Unbounded().testSuite(), |
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new Bounded().testSuite()); |
37 |
} |
38 |
|
39 |
|
40 |
/** |
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* Create a queue of given size containing consecutive |
42 |
* Integers 0 ... n. |
43 |
*/ |
44 |
private LinkedBlockingQueue<Integer> populatedQueue(int n) { |
45 |
LinkedBlockingQueue<Integer> q = |
46 |
new LinkedBlockingQueue<Integer>(n); |
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assertTrue(q.isEmpty()); |
48 |
for (int i = 0; i < n; i++) |
49 |
assertTrue(q.offer(new Integer(i))); |
50 |
assertFalse(q.isEmpty()); |
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assertEquals(0, q.remainingCapacity()); |
52 |
assertEquals(n, q.size()); |
53 |
return q; |
54 |
} |
55 |
|
56 |
/** |
57 |
* A new queue has the indicated capacity, or Integer.MAX_VALUE if |
58 |
* none given |
59 |
*/ |
60 |
public void testConstructor1() { |
61 |
assertEquals(SIZE, new LinkedBlockingQueue(SIZE).remainingCapacity()); |
62 |
assertEquals(Integer.MAX_VALUE, new LinkedBlockingQueue().remainingCapacity()); |
63 |
} |
64 |
|
65 |
/** |
66 |
* Constructor throws IAE if capacity argument nonpositive |
67 |
*/ |
68 |
public void testConstructor2() { |
69 |
try { |
70 |
LinkedBlockingQueue q = new LinkedBlockingQueue(0); |
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shouldThrow(); |
72 |
} catch (IllegalArgumentException success) {} |
73 |
} |
74 |
|
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/** |
76 |
* Initializing from null Collection throws NPE |
77 |
*/ |
78 |
public void testConstructor3() { |
79 |
try { |
80 |
LinkedBlockingQueue q = new LinkedBlockingQueue(null); |
81 |
shouldThrow(); |
82 |
} catch (NullPointerException success) {} |
83 |
} |
84 |
|
85 |
/** |
86 |
* Initializing from Collection of null elements throws NPE |
87 |
*/ |
88 |
public void testConstructor4() { |
89 |
try { |
90 |
Integer[] ints = new Integer[SIZE]; |
91 |
LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints)); |
92 |
shouldThrow(); |
93 |
} catch (NullPointerException success) {} |
94 |
} |
95 |
|
96 |
/** |
97 |
* Initializing from Collection with some null elements throws NPE |
98 |
*/ |
99 |
public void testConstructor5() { |
100 |
try { |
101 |
Integer[] ints = new Integer[SIZE]; |
102 |
for (int i = 0; i < SIZE-1; ++i) |
103 |
ints[i] = new Integer(i); |
104 |
LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints)); |
105 |
shouldThrow(); |
106 |
} catch (NullPointerException success) {} |
107 |
} |
108 |
|
109 |
/** |
110 |
* Queue contains all elements of collection used to initialize |
111 |
*/ |
112 |
public void testConstructor6() { |
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Integer[] ints = new Integer[SIZE]; |
114 |
for (int i = 0; i < SIZE; ++i) |
115 |
ints[i] = new Integer(i); |
116 |
LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints)); |
117 |
for (int i = 0; i < SIZE; ++i) |
118 |
assertEquals(ints[i], q.poll()); |
119 |
} |
120 |
|
121 |
/** |
122 |
* Queue transitions from empty to full when elements added |
123 |
*/ |
124 |
public void testEmptyFull() { |
125 |
LinkedBlockingQueue q = new LinkedBlockingQueue(2); |
126 |
assertTrue(q.isEmpty()); |
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assertEquals("should have room for 2", 2, q.remainingCapacity()); |
128 |
q.add(one); |
129 |
assertFalse(q.isEmpty()); |
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q.add(two); |
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assertFalse(q.isEmpty()); |
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assertEquals(0, q.remainingCapacity()); |
133 |
assertFalse(q.offer(three)); |
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} |
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|
136 |
/** |
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* remainingCapacity decreases on add, increases on remove |
138 |
*/ |
139 |
public void testRemainingCapacity() { |
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LinkedBlockingQueue q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.remainingCapacity()); |
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assertEquals(SIZE-i, q.size()); |
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q.remove(); |
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} |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(SIZE-i, q.remainingCapacity()); |
148 |
assertEquals(i, q.size()); |
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q.add(new Integer(i)); |
150 |
} |
151 |
} |
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|
153 |
/** |
154 |
* offer(null) throws NPE |
155 |
*/ |
156 |
public void testOfferNull() { |
157 |
try { |
158 |
LinkedBlockingQueue q = new LinkedBlockingQueue(1); |
159 |
q.offer(null); |
160 |
shouldThrow(); |
161 |
} catch (NullPointerException success) {} |
162 |
} |
163 |
|
164 |
/** |
165 |
* add(null) throws NPE |
166 |
*/ |
167 |
public void testAddNull() { |
168 |
try { |
169 |
LinkedBlockingQueue q = new LinkedBlockingQueue(1); |
170 |
q.add(null); |
171 |
shouldThrow(); |
172 |
} catch (NullPointerException success) {} |
173 |
} |
174 |
|
175 |
/** |
176 |
* Offer succeeds if not full; fails if full |
177 |
*/ |
178 |
public void testOffer() { |
179 |
LinkedBlockingQueue q = new LinkedBlockingQueue(1); |
180 |
assertTrue(q.offer(zero)); |
181 |
assertFalse(q.offer(one)); |
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} |
183 |
|
184 |
/** |
185 |
* add succeeds if not full; throws ISE if full |
186 |
*/ |
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public void testAdd() { |
188 |
try { |
189 |
LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertTrue(q.add(new Integer(i))); |
192 |
} |
193 |
assertEquals(0, q.remainingCapacity()); |
194 |
q.add(new Integer(SIZE)); |
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shouldThrow(); |
196 |
} catch (IllegalStateException success) {} |
197 |
} |
198 |
|
199 |
/** |
200 |
* addAll(null) throws NPE |
201 |
*/ |
202 |
public void testAddAll1() { |
203 |
try { |
204 |
LinkedBlockingQueue q = new LinkedBlockingQueue(1); |
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q.addAll(null); |
206 |
shouldThrow(); |
207 |
} catch (NullPointerException success) {} |
208 |
} |
209 |
|
210 |
/** |
211 |
* addAll(this) throws IAE |
212 |
*/ |
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public void testAddAllSelf() { |
214 |
try { |
215 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
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q.addAll(q); |
217 |
shouldThrow(); |
218 |
} catch (IllegalArgumentException success) {} |
219 |
} |
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|
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/** |
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* addAll of a collection with null elements throws NPE |
223 |
*/ |
224 |
public void testAddAll2() { |
225 |
try { |
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LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE); |
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Integer[] ints = new Integer[SIZE]; |
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q.addAll(Arrays.asList(ints)); |
229 |
shouldThrow(); |
230 |
} catch (NullPointerException success) {} |
231 |
} |
232 |
|
233 |
/** |
234 |
* addAll of a collection with any null elements throws NPE after |
235 |
* possibly adding some elements |
236 |
*/ |
237 |
public void testAddAll3() { |
238 |
try { |
239 |
LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE); |
240 |
Integer[] ints = new Integer[SIZE]; |
241 |
for (int i = 0; i < SIZE-1; ++i) |
242 |
ints[i] = new Integer(i); |
243 |
q.addAll(Arrays.asList(ints)); |
244 |
shouldThrow(); |
245 |
} catch (NullPointerException success) {} |
246 |
} |
247 |
|
248 |
/** |
249 |
* addAll throws ISE if not enough room |
250 |
*/ |
251 |
public void testAddAll4() { |
252 |
try { |
253 |
LinkedBlockingQueue q = new LinkedBlockingQueue(1); |
254 |
Integer[] ints = new Integer[SIZE]; |
255 |
for (int i = 0; i < SIZE; ++i) |
256 |
ints[i] = new Integer(i); |
257 |
q.addAll(Arrays.asList(ints)); |
258 |
shouldThrow(); |
259 |
} catch (IllegalStateException success) {} |
260 |
} |
261 |
|
262 |
/** |
263 |
* Queue contains all elements, in traversal order, of successful addAll |
264 |
*/ |
265 |
public void testAddAll5() { |
266 |
Integer[] empty = new Integer[0]; |
267 |
Integer[] ints = new Integer[SIZE]; |
268 |
for (int i = 0; i < SIZE; ++i) |
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ints[i] = new Integer(i); |
270 |
LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE); |
271 |
assertFalse(q.addAll(Arrays.asList(empty))); |
272 |
assertTrue(q.addAll(Arrays.asList(ints))); |
273 |
for (int i = 0; i < SIZE; ++i) |
274 |
assertEquals(ints[i], q.poll()); |
275 |
} |
276 |
|
277 |
/** |
278 |
* put(null) throws NPE |
279 |
*/ |
280 |
public void testPutNull() throws InterruptedException { |
281 |
try { |
282 |
LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE); |
283 |
q.put(null); |
284 |
shouldThrow(); |
285 |
} catch (NullPointerException success) {} |
286 |
} |
287 |
|
288 |
/** |
289 |
* all elements successfully put are contained |
290 |
*/ |
291 |
public void testPut() throws InterruptedException { |
292 |
LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE); |
293 |
for (int i = 0; i < SIZE; ++i) { |
294 |
Integer I = new Integer(i); |
295 |
q.put(I); |
296 |
assertTrue(q.contains(I)); |
297 |
} |
298 |
assertEquals(0, q.remainingCapacity()); |
299 |
} |
300 |
|
301 |
/** |
302 |
* put blocks interruptibly if full |
303 |
*/ |
304 |
public void testBlockingPut() throws InterruptedException { |
305 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE); |
306 |
Thread t = new Thread(new CheckedRunnable() { |
307 |
public void realRun() throws InterruptedException { |
308 |
for (int i = 0; i < SIZE; ++i) |
309 |
q.put(i); |
310 |
assertEquals(SIZE, q.size()); |
311 |
assertEquals(0, q.remainingCapacity()); |
312 |
try { |
313 |
q.put(99); |
314 |
shouldThrow(); |
315 |
} catch (InterruptedException success) {} |
316 |
}}); |
317 |
|
318 |
t.start(); |
319 |
Thread.sleep(SHORT_DELAY_MS); |
320 |
t.interrupt(); |
321 |
t.join(); |
322 |
assertEquals(SIZE, q.size()); |
323 |
assertEquals(0, q.remainingCapacity()); |
324 |
} |
325 |
|
326 |
/** |
327 |
* put blocks waiting for take when full |
328 |
*/ |
329 |
public void testPutWithTake() throws InterruptedException { |
330 |
final int capacity = 2; |
331 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(2); |
332 |
Thread t = new Thread(new CheckedRunnable() { |
333 |
public void realRun() throws InterruptedException { |
334 |
for (int i = 0; i < capacity + 1; i++) |
335 |
q.put(i); |
336 |
try { |
337 |
q.put(99); |
338 |
shouldThrow(); |
339 |
} catch (InterruptedException success) {} |
340 |
}}); |
341 |
|
342 |
t.start(); |
343 |
Thread.sleep(SHORT_DELAY_MS); |
344 |
assertEquals(q.remainingCapacity(), 0); |
345 |
assertEquals(0, q.take()); |
346 |
Thread.sleep(SHORT_DELAY_MS); |
347 |
t.interrupt(); |
348 |
t.join(); |
349 |
assertEquals(q.remainingCapacity(), 0); |
350 |
} |
351 |
|
352 |
/** |
353 |
* timed offer times out if full and elements not taken |
354 |
*/ |
355 |
public void testTimedOffer() throws InterruptedException { |
356 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(2); |
357 |
Thread t = new Thread(new CheckedRunnable() { |
358 |
public void realRun() throws InterruptedException { |
359 |
q.put(new Object()); |
360 |
q.put(new Object()); |
361 |
assertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS)); |
362 |
try { |
363 |
q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS); |
364 |
shouldThrow(); |
365 |
} catch (InterruptedException success) {} |
366 |
}}); |
367 |
|
368 |
t.start(); |
369 |
Thread.sleep(SMALL_DELAY_MS); |
370 |
t.interrupt(); |
371 |
t.join(); |
372 |
} |
373 |
|
374 |
/** |
375 |
* take retrieves elements in FIFO order |
376 |
*/ |
377 |
public void testTake() throws InterruptedException { |
378 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
379 |
for (int i = 0; i < SIZE; ++i) { |
380 |
assertEquals(i, q.take()); |
381 |
} |
382 |
} |
383 |
|
384 |
/** |
385 |
* Take removes existing elements until empty, then blocks interruptibly |
386 |
*/ |
387 |
public void testBlockingTake() throws InterruptedException { |
388 |
final LinkedBlockingQueue q = populatedQueue(SIZE); |
389 |
Thread t = new Thread(new CheckedRunnable() { |
390 |
public void realRun() throws InterruptedException { |
391 |
for (int i = 0; i < SIZE; ++i) { |
392 |
assertEquals(i, q.take()); |
393 |
} |
394 |
try { |
395 |
q.take(); |
396 |
shouldThrow(); |
397 |
} catch (InterruptedException success) {} |
398 |
}}); |
399 |
|
400 |
t.start(); |
401 |
Thread.sleep(SHORT_DELAY_MS); |
402 |
t.interrupt(); |
403 |
t.join(); |
404 |
} |
405 |
|
406 |
/** |
407 |
* poll succeeds unless empty |
408 |
*/ |
409 |
public void testPoll() { |
410 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
411 |
for (int i = 0; i < SIZE; ++i) { |
412 |
assertEquals(i, q.poll()); |
413 |
} |
414 |
assertNull(q.poll()); |
415 |
} |
416 |
|
417 |
/** |
418 |
* timed poll with zero timeout succeeds when non-empty, else times out |
419 |
*/ |
420 |
public void testTimedPoll0() throws InterruptedException { |
421 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
422 |
for (int i = 0; i < SIZE; ++i) { |
423 |
assertEquals(i, q.poll(0, MILLISECONDS)); |
424 |
} |
425 |
assertNull(q.poll(0, MILLISECONDS)); |
426 |
} |
427 |
|
428 |
/** |
429 |
* timed poll with nonzero timeout succeeds when non-empty, else times out |
430 |
*/ |
431 |
public void testTimedPoll() throws InterruptedException { |
432 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
433 |
for (int i = 0; i < SIZE; ++i) { |
434 |
assertEquals(i, q.poll(SHORT_DELAY_MS, MILLISECONDS)); |
435 |
} |
436 |
assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS)); |
437 |
} |
438 |
|
439 |
/** |
440 |
* Interrupted timed poll throws InterruptedException instead of |
441 |
* returning timeout status |
442 |
*/ |
443 |
public void testInterruptedTimedPoll() throws InterruptedException { |
444 |
Thread t = new Thread(new CheckedRunnable() { |
445 |
public void realRun() throws InterruptedException { |
446 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
447 |
for (int i = 0; i < SIZE; ++i) { |
448 |
assertEquals(i, q.poll(SHORT_DELAY_MS, MILLISECONDS)); |
449 |
} |
450 |
try { |
451 |
q.poll(SMALL_DELAY_MS, MILLISECONDS); |
452 |
shouldThrow(); |
453 |
} catch (InterruptedException success) {} |
454 |
}}); |
455 |
|
456 |
t.start(); |
457 |
Thread.sleep(SHORT_DELAY_MS); |
458 |
t.interrupt(); |
459 |
t.join(); |
460 |
} |
461 |
|
462 |
/** |
463 |
* peek returns next element, or null if empty |
464 |
*/ |
465 |
public void testPeek() { |
466 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
467 |
for (int i = 0; i < SIZE; ++i) { |
468 |
assertEquals(i, q.peek()); |
469 |
assertEquals(i, q.poll()); |
470 |
assertTrue(q.peek() == null || |
471 |
!q.peek().equals(i)); |
472 |
} |
473 |
assertNull(q.peek()); |
474 |
} |
475 |
|
476 |
/** |
477 |
* element returns next element, or throws NSEE if empty |
478 |
*/ |
479 |
public void testElement() { |
480 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
481 |
for (int i = 0; i < SIZE; ++i) { |
482 |
assertEquals(i, q.element()); |
483 |
assertEquals(i, q.poll()); |
484 |
} |
485 |
try { |
486 |
q.element(); |
487 |
shouldThrow(); |
488 |
} catch (NoSuchElementException success) {} |
489 |
} |
490 |
|
491 |
/** |
492 |
* remove removes next element, or throws NSEE if empty |
493 |
*/ |
494 |
public void testRemove() { |
495 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
496 |
for (int i = 0; i < SIZE; ++i) { |
497 |
assertEquals(i, q.remove()); |
498 |
} |
499 |
try { |
500 |
q.remove(); |
501 |
shouldThrow(); |
502 |
} catch (NoSuchElementException success) {} |
503 |
} |
504 |
|
505 |
/** |
506 |
* remove(x) removes x and returns true if present |
507 |
*/ |
508 |
public void testRemoveElement() { |
509 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
510 |
for (int i = 1; i < SIZE; i+=2) { |
511 |
assertTrue(q.contains(i)); |
512 |
assertTrue(q.remove(i)); |
513 |
assertFalse(q.contains(i)); |
514 |
assertTrue(q.contains(i-1)); |
515 |
} |
516 |
for (int i = 0; i < SIZE; i+=2) { |
517 |
assertTrue(q.contains(i)); |
518 |
assertTrue(q.remove(i)); |
519 |
assertFalse(q.contains(i)); |
520 |
assertFalse(q.remove(i+1)); |
521 |
assertFalse(q.contains(i+1)); |
522 |
} |
523 |
assertTrue(q.isEmpty()); |
524 |
} |
525 |
|
526 |
/** |
527 |
* An add following remove(x) succeeds |
528 |
*/ |
529 |
public void testRemoveElementAndAdd() throws InterruptedException { |
530 |
LinkedBlockingQueue q = new LinkedBlockingQueue(); |
531 |
assertTrue(q.add(new Integer(1))); |
532 |
assertTrue(q.add(new Integer(2))); |
533 |
assertTrue(q.remove(new Integer(1))); |
534 |
assertTrue(q.remove(new Integer(2))); |
535 |
assertTrue(q.add(new Integer(3))); |
536 |
assertTrue(q.take() != null); |
537 |
} |
538 |
|
539 |
/** |
540 |
* contains(x) reports true when elements added but not yet removed |
541 |
*/ |
542 |
public void testContains() { |
543 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
544 |
for (int i = 0; i < SIZE; ++i) { |
545 |
assertTrue(q.contains(new Integer(i))); |
546 |
q.poll(); |
547 |
assertFalse(q.contains(new Integer(i))); |
548 |
} |
549 |
} |
550 |
|
551 |
/** |
552 |
* clear removes all elements |
553 |
*/ |
554 |
public void testClear() { |
555 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
556 |
q.clear(); |
557 |
assertTrue(q.isEmpty()); |
558 |
assertEquals(0, q.size()); |
559 |
assertEquals(SIZE, q.remainingCapacity()); |
560 |
q.add(one); |
561 |
assertFalse(q.isEmpty()); |
562 |
assertTrue(q.contains(one)); |
563 |
q.clear(); |
564 |
assertTrue(q.isEmpty()); |
565 |
} |
566 |
|
567 |
/** |
568 |
* containsAll(c) is true when c contains a subset of elements |
569 |
*/ |
570 |
public void testContainsAll() { |
571 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
572 |
LinkedBlockingQueue p = new LinkedBlockingQueue(SIZE); |
573 |
for (int i = 0; i < SIZE; ++i) { |
574 |
assertTrue(q.containsAll(p)); |
575 |
assertFalse(p.containsAll(q)); |
576 |
p.add(new Integer(i)); |
577 |
} |
578 |
assertTrue(p.containsAll(q)); |
579 |
} |
580 |
|
581 |
/** |
582 |
* retainAll(c) retains only those elements of c and reports true if changed |
583 |
*/ |
584 |
public void testRetainAll() { |
585 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
586 |
LinkedBlockingQueue p = populatedQueue(SIZE); |
587 |
for (int i = 0; i < SIZE; ++i) { |
588 |
boolean changed = q.retainAll(p); |
589 |
if (i == 0) |
590 |
assertFalse(changed); |
591 |
else |
592 |
assertTrue(changed); |
593 |
|
594 |
assertTrue(q.containsAll(p)); |
595 |
assertEquals(SIZE-i, q.size()); |
596 |
p.remove(); |
597 |
} |
598 |
} |
599 |
|
600 |
/** |
601 |
* removeAll(c) removes only those elements of c and reports true if changed |
602 |
*/ |
603 |
public void testRemoveAll() { |
604 |
for (int i = 1; i < SIZE; ++i) { |
605 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
606 |
LinkedBlockingQueue p = populatedQueue(i); |
607 |
assertTrue(q.removeAll(p)); |
608 |
assertEquals(SIZE-i, q.size()); |
609 |
for (int j = 0; j < i; ++j) { |
610 |
Integer I = (Integer)(p.remove()); |
611 |
assertFalse(q.contains(I)); |
612 |
} |
613 |
} |
614 |
} |
615 |
|
616 |
/** |
617 |
* toArray contains all elements in FIFO order |
618 |
*/ |
619 |
public void testToArray() { |
620 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
621 |
Object[] o = q.toArray(); |
622 |
for (int i = 0; i < o.length; i++) |
623 |
assertSame(o[i], q.poll()); |
624 |
} |
625 |
|
626 |
/** |
627 |
* toArray(a) contains all elements in FIFO order |
628 |
*/ |
629 |
public void testToArray2() throws InterruptedException { |
630 |
LinkedBlockingQueue<Integer> q = populatedQueue(SIZE); |
631 |
Integer[] ints = new Integer[SIZE]; |
632 |
Integer[] array = q.toArray(ints); |
633 |
assertSame(ints, array); |
634 |
for (int i = 0; i < ints.length; i++) |
635 |
assertSame(ints[i], q.poll()); |
636 |
} |
637 |
|
638 |
/** |
639 |
* toArray(null) throws NullPointerException |
640 |
*/ |
641 |
public void testToArray_NullArg() { |
642 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
643 |
try { |
644 |
q.toArray(null); |
645 |
shouldThrow(); |
646 |
} catch (NullPointerException success) {} |
647 |
} |
648 |
|
649 |
/** |
650 |
* toArray(incompatible array type) throws ArrayStoreException |
651 |
*/ |
652 |
public void testToArray1_BadArg() { |
653 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
654 |
try { |
655 |
q.toArray(new String[10]); |
656 |
shouldThrow(); |
657 |
} catch (ArrayStoreException success) {} |
658 |
} |
659 |
|
660 |
|
661 |
/** |
662 |
* iterator iterates through all elements |
663 |
*/ |
664 |
public void testIterator() throws InterruptedException { |
665 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
666 |
Iterator it = q.iterator(); |
667 |
while (it.hasNext()) { |
668 |
assertEquals(it.next(), q.take()); |
669 |
} |
670 |
} |
671 |
|
672 |
/** |
673 |
* iterator.remove removes current element |
674 |
*/ |
675 |
public void testIteratorRemove() { |
676 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(3); |
677 |
q.add(two); |
678 |
q.add(one); |
679 |
q.add(three); |
680 |
|
681 |
Iterator it = q.iterator(); |
682 |
it.next(); |
683 |
it.remove(); |
684 |
|
685 |
it = q.iterator(); |
686 |
assertSame(it.next(), one); |
687 |
assertSame(it.next(), three); |
688 |
assertFalse(it.hasNext()); |
689 |
} |
690 |
|
691 |
|
692 |
/** |
693 |
* iterator ordering is FIFO |
694 |
*/ |
695 |
public void testIteratorOrdering() { |
696 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(3); |
697 |
q.add(one); |
698 |
q.add(two); |
699 |
q.add(three); |
700 |
assertEquals(0, q.remainingCapacity()); |
701 |
int k = 0; |
702 |
for (Iterator it = q.iterator(); it.hasNext();) { |
703 |
assertEquals(++k, it.next()); |
704 |
} |
705 |
assertEquals(3, k); |
706 |
} |
707 |
|
708 |
/** |
709 |
* Modifications do not cause iterators to fail |
710 |
*/ |
711 |
public void testWeaklyConsistentIteration() { |
712 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(3); |
713 |
q.add(one); |
714 |
q.add(two); |
715 |
q.add(three); |
716 |
for (Iterator it = q.iterator(); it.hasNext();) { |
717 |
q.remove(); |
718 |
it.next(); |
719 |
} |
720 |
assertEquals(0, q.size()); |
721 |
} |
722 |
|
723 |
|
724 |
/** |
725 |
* toString contains toStrings of elements |
726 |
*/ |
727 |
public void testToString() { |
728 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
729 |
String s = q.toString(); |
730 |
for (int i = 0; i < SIZE; ++i) { |
731 |
assertTrue(s.indexOf(String.valueOf(i)) >= 0); |
732 |
} |
733 |
} |
734 |
|
735 |
|
736 |
/** |
737 |
* offer transfers elements across Executor tasks |
738 |
*/ |
739 |
public void testOfferInExecutor() { |
740 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(2); |
741 |
q.add(one); |
742 |
q.add(two); |
743 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
744 |
executor.execute(new CheckedRunnable() { |
745 |
public void realRun() throws InterruptedException { |
746 |
assertFalse(q.offer(three)); |
747 |
assertTrue(q.offer(three, MEDIUM_DELAY_MS, MILLISECONDS)); |
748 |
assertEquals(0, q.remainingCapacity()); |
749 |
}}); |
750 |
|
751 |
executor.execute(new CheckedRunnable() { |
752 |
public void realRun() throws InterruptedException { |
753 |
Thread.sleep(SMALL_DELAY_MS); |
754 |
assertSame(one, q.take()); |
755 |
}}); |
756 |
|
757 |
joinPool(executor); |
758 |
} |
759 |
|
760 |
/** |
761 |
* poll retrieves elements across Executor threads |
762 |
*/ |
763 |
public void testPollInExecutor() { |
764 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(2); |
765 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
766 |
executor.execute(new CheckedRunnable() { |
767 |
public void realRun() throws InterruptedException { |
768 |
assertNull(q.poll()); |
769 |
assertSame(one, q.poll(MEDIUM_DELAY_MS, MILLISECONDS)); |
770 |
assertTrue(q.isEmpty()); |
771 |
}}); |
772 |
|
773 |
executor.execute(new CheckedRunnable() { |
774 |
public void realRun() throws InterruptedException { |
775 |
Thread.sleep(SMALL_DELAY_MS); |
776 |
q.put(one); |
777 |
}}); |
778 |
|
779 |
joinPool(executor); |
780 |
} |
781 |
|
782 |
/** |
783 |
* A deserialized serialized queue has same elements in same order |
784 |
*/ |
785 |
public void testSerialization() throws Exception { |
786 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
787 |
|
788 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
789 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
790 |
out.writeObject(q); |
791 |
out.close(); |
792 |
|
793 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
794 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
795 |
LinkedBlockingQueue r = (LinkedBlockingQueue)in.readObject(); |
796 |
assertEquals(q.size(), r.size()); |
797 |
while (!q.isEmpty()) |
798 |
assertEquals(q.remove(), r.remove()); |
799 |
} |
800 |
|
801 |
/** |
802 |
* drainTo(null) throws NPE |
803 |
*/ |
804 |
public void testDrainToNull() { |
805 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
806 |
try { |
807 |
q.drainTo(null); |
808 |
shouldThrow(); |
809 |
} catch (NullPointerException success) {} |
810 |
} |
811 |
|
812 |
/** |
813 |
* drainTo(this) throws IAE |
814 |
*/ |
815 |
public void testDrainToSelf() { |
816 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
817 |
try { |
818 |
q.drainTo(q); |
819 |
shouldThrow(); |
820 |
} catch (IllegalArgumentException success) {} |
821 |
} |
822 |
|
823 |
/** |
824 |
* drainTo(c) empties queue into another collection c |
825 |
*/ |
826 |
public void testDrainTo() { |
827 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
828 |
ArrayList l = new ArrayList(); |
829 |
q.drainTo(l); |
830 |
assertEquals(q.size(), 0); |
831 |
assertEquals(l.size(), SIZE); |
832 |
for (int i = 0; i < SIZE; ++i) |
833 |
assertEquals(l.get(i), new Integer(i)); |
834 |
q.add(zero); |
835 |
q.add(one); |
836 |
assertFalse(q.isEmpty()); |
837 |
assertTrue(q.contains(zero)); |
838 |
assertTrue(q.contains(one)); |
839 |
l.clear(); |
840 |
q.drainTo(l); |
841 |
assertEquals(q.size(), 0); |
842 |
assertEquals(l.size(), 2); |
843 |
for (int i = 0; i < 2; ++i) |
844 |
assertEquals(l.get(i), new Integer(i)); |
845 |
} |
846 |
|
847 |
/** |
848 |
* drainTo empties full queue, unblocking a waiting put. |
849 |
*/ |
850 |
public void testDrainToWithActivePut() throws InterruptedException { |
851 |
final LinkedBlockingQueue q = populatedQueue(SIZE); |
852 |
Thread t = new Thread(new CheckedRunnable() { |
853 |
public void realRun() throws InterruptedException { |
854 |
q.put(new Integer(SIZE+1)); |
855 |
}}); |
856 |
|
857 |
t.start(); |
858 |
ArrayList l = new ArrayList(); |
859 |
q.drainTo(l); |
860 |
assertTrue(l.size() >= SIZE); |
861 |
for (int i = 0; i < SIZE; ++i) |
862 |
assertEquals(l.get(i), new Integer(i)); |
863 |
t.join(); |
864 |
assertTrue(q.size() + l.size() >= SIZE); |
865 |
} |
866 |
|
867 |
/** |
868 |
* drainTo(null, n) throws NPE |
869 |
*/ |
870 |
public void testDrainToNullN() { |
871 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
872 |
try { |
873 |
q.drainTo(null, 0); |
874 |
shouldThrow(); |
875 |
} catch (NullPointerException success) {} |
876 |
} |
877 |
|
878 |
/** |
879 |
* drainTo(this, n) throws IAE |
880 |
*/ |
881 |
public void testDrainToSelfN() { |
882 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
883 |
try { |
884 |
q.drainTo(q, 0); |
885 |
shouldThrow(); |
886 |
} catch (IllegalArgumentException success) {} |
887 |
} |
888 |
|
889 |
/** |
890 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
891 |
*/ |
892 |
public void testDrainToN() { |
893 |
LinkedBlockingQueue q = new LinkedBlockingQueue(); |
894 |
for (int i = 0; i < SIZE + 2; ++i) { |
895 |
for (int j = 0; j < SIZE; j++) |
896 |
assertTrue(q.offer(new Integer(j))); |
897 |
ArrayList l = new ArrayList(); |
898 |
q.drainTo(l, i); |
899 |
int k = (i < SIZE) ? i : SIZE; |
900 |
assertEquals(l.size(), k); |
901 |
assertEquals(q.size(), SIZE-k); |
902 |
for (int j = 0; j < k; ++j) |
903 |
assertEquals(l.get(j), new Integer(j)); |
904 |
while (q.poll() != null) ; |
905 |
} |
906 |
} |
907 |
|
908 |
} |