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 John Vint |
6 |
*/ |
7 |
|
8 |
import java.io.BufferedInputStream; |
9 |
import java.io.BufferedOutputStream; |
10 |
import java.io.ByteArrayInputStream; |
11 |
import java.io.ByteArrayOutputStream; |
12 |
import java.io.ObjectInputStream; |
13 |
import java.io.ObjectOutputStream; |
14 |
import java.util.ArrayList; |
15 |
import java.util.Arrays; |
16 |
import java.util.Iterator; |
17 |
import java.util.List; |
18 |
import java.util.NoSuchElementException; |
19 |
import java.util.concurrent.*; |
20 |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
21 |
import static java.util.concurrent.TimeUnit.NANOSECONDS; |
22 |
import junit.framework.Test; |
23 |
import junit.framework.TestSuite; |
24 |
|
25 |
@SuppressWarnings({"unchecked", "rawtypes"}) |
26 |
public class LinkedTransferQueueTest extends JSR166TestCase { |
27 |
|
28 |
public static class Generic extends BlockingQueueTest { |
29 |
protected BlockingQueue emptyCollection() { |
30 |
return new LinkedTransferQueue(); |
31 |
} |
32 |
} |
33 |
|
34 |
public static void main(String[] args) { |
35 |
junit.textui.TestRunner.run(suite()); |
36 |
} |
37 |
|
38 |
public static Test suite() { |
39 |
return newTestSuite(LinkedTransferQueueTest.class, |
40 |
new Generic().testSuite()); |
41 |
} |
42 |
|
43 |
void checkEmpty(BlockingQueue q) { |
44 |
try { |
45 |
assertTrue(q.isEmpty()); |
46 |
assertEquals(0, q.size()); |
47 |
assertNull(q.peek()); |
48 |
assertNull(q.poll()); |
49 |
assertNull(q.poll(0, MILLISECONDS)); |
50 |
assertEquals(q.toString(), "[]"); |
51 |
assertTrue(Arrays.equals(q.toArray(), new Object[0])); |
52 |
assertFalse(q.iterator().hasNext()); |
53 |
try { |
54 |
q.element(); |
55 |
shouldThrow(); |
56 |
} catch (NoSuchElementException success) {} |
57 |
try { |
58 |
q.iterator().next(); |
59 |
shouldThrow(); |
60 |
} catch (NoSuchElementException success) {} |
61 |
try { |
62 |
q.remove(); |
63 |
shouldThrow(); |
64 |
} catch (NoSuchElementException success) {} |
65 |
} catch (InterruptedException ie) { |
66 |
threadUnexpectedException(ie); |
67 |
} |
68 |
} |
69 |
|
70 |
/** |
71 |
* Constructor builds new queue with size being zero and empty |
72 |
* being true |
73 |
*/ |
74 |
public void testConstructor1() { |
75 |
assertEquals(0, new LinkedTransferQueue().size()); |
76 |
assertTrue(new LinkedTransferQueue().isEmpty()); |
77 |
} |
78 |
|
79 |
/** |
80 |
* Initializing constructor with null collection throws |
81 |
* NullPointerException |
82 |
*/ |
83 |
public void testConstructor2() { |
84 |
try { |
85 |
new LinkedTransferQueue(null); |
86 |
shouldThrow(); |
87 |
} catch (NullPointerException success) {} |
88 |
} |
89 |
|
90 |
/** |
91 |
* Initializing from Collection of null elements throws |
92 |
* NullPointerException |
93 |
*/ |
94 |
public void testConstructor3() { |
95 |
try { |
96 |
Integer[] ints = new Integer[SIZE]; |
97 |
new LinkedTransferQueue(Arrays.asList(ints)); |
98 |
shouldThrow(); |
99 |
} catch (NullPointerException success) {} |
100 |
} |
101 |
|
102 |
/** |
103 |
* Initializing constructor with a collection containing some null elements |
104 |
* throws NullPointerException |
105 |
*/ |
106 |
public void testConstructor4() { |
107 |
try { |
108 |
Integer[] ints = new Integer[SIZE]; |
109 |
for (int i = 0; i < SIZE - 1; ++i) { |
110 |
ints[i] = i; |
111 |
} |
112 |
new LinkedTransferQueue(Arrays.asList(ints)); |
113 |
shouldThrow(); |
114 |
} catch (NullPointerException success) {} |
115 |
} |
116 |
|
117 |
/** |
118 |
* Queue contains all elements of the collection it is initialized by |
119 |
*/ |
120 |
public void testConstructor5() { |
121 |
Integer[] ints = new Integer[SIZE]; |
122 |
for (int i = 0; i < SIZE; ++i) { |
123 |
ints[i] = i; |
124 |
} |
125 |
List intList = Arrays.asList(ints); |
126 |
LinkedTransferQueue q |
127 |
= new LinkedTransferQueue(intList); |
128 |
assertEquals(q.size(), intList.size()); |
129 |
assertEquals(q.toString(), intList.toString()); |
130 |
assertTrue(Arrays.equals(q.toArray(), |
131 |
intList.toArray())); |
132 |
assertTrue(Arrays.equals(q.toArray(new Object[0]), |
133 |
intList.toArray(new Object[0]))); |
134 |
assertTrue(Arrays.equals(q.toArray(new Object[SIZE]), |
135 |
intList.toArray(new Object[SIZE]))); |
136 |
for (int i = 0; i < SIZE; ++i) { |
137 |
assertEquals(ints[i], q.poll()); |
138 |
} |
139 |
} |
140 |
|
141 |
/** |
142 |
* remainingCapacity() always returns Integer.MAX_VALUE |
143 |
*/ |
144 |
public void testRemainingCapacity() { |
145 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
146 |
for (int i = 0; i < SIZE; ++i) { |
147 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
148 |
assertEquals(SIZE - i, q.size()); |
149 |
q.remove(); |
150 |
} |
151 |
for (int i = 0; i < SIZE; ++i) { |
152 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
153 |
assertEquals(i, q.size()); |
154 |
q.add(i); |
155 |
} |
156 |
} |
157 |
|
158 |
/** |
159 |
* offer(null) throws NullPointerException |
160 |
*/ |
161 |
public void testOfferNull() { |
162 |
try { |
163 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
164 |
q.offer(null); |
165 |
shouldThrow(); |
166 |
} catch (NullPointerException success) {} |
167 |
} |
168 |
|
169 |
/** |
170 |
* add(null) throws NullPointerException |
171 |
*/ |
172 |
public void testAddNull() { |
173 |
try { |
174 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
175 |
q.add(null); |
176 |
shouldThrow(); |
177 |
} catch (NullPointerException success) {} |
178 |
} |
179 |
|
180 |
/** |
181 |
* addAll(null) throws NullPointerException |
182 |
*/ |
183 |
public void testAddAll1() { |
184 |
try { |
185 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
186 |
q.addAll(null); |
187 |
shouldThrow(); |
188 |
} catch (NullPointerException success) {} |
189 |
} |
190 |
|
191 |
/** |
192 |
* addAll(this) throws IllegalArgumentException |
193 |
*/ |
194 |
public void testAddAllSelf() { |
195 |
try { |
196 |
LinkedTransferQueue q = populatedQueue(SIZE); |
197 |
q.addAll(q); |
198 |
shouldThrow(); |
199 |
} catch (IllegalArgumentException success) {} |
200 |
} |
201 |
|
202 |
/** |
203 |
* addAll of a collection with null elements throws NullPointerException |
204 |
*/ |
205 |
public void testAddAll2() { |
206 |
try { |
207 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
208 |
Integer[] ints = new Integer[SIZE]; |
209 |
q.addAll(Arrays.asList(ints)); |
210 |
shouldThrow(); |
211 |
} catch (NullPointerException success) {} |
212 |
} |
213 |
|
214 |
/** |
215 |
* addAll of a collection with any null elements throws |
216 |
* NullPointerException after possibly adding some elements |
217 |
*/ |
218 |
public void testAddAll3() { |
219 |
try { |
220 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
221 |
Integer[] ints = new Integer[SIZE]; |
222 |
for (int i = 0; i < SIZE - 1; ++i) { |
223 |
ints[i] = i; |
224 |
} |
225 |
q.addAll(Arrays.asList(ints)); |
226 |
shouldThrow(); |
227 |
} catch (NullPointerException success) {} |
228 |
} |
229 |
|
230 |
/** |
231 |
* Queue contains all elements, in traversal order, of successful addAll |
232 |
*/ |
233 |
public void testAddAll5() { |
234 |
Integer[] empty = new Integer[0]; |
235 |
Integer[] ints = new Integer[SIZE]; |
236 |
for (int i = 0; i < SIZE; ++i) { |
237 |
ints[i] = i; |
238 |
} |
239 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
240 |
assertFalse(q.addAll(Arrays.asList(empty))); |
241 |
assertTrue(q.addAll(Arrays.asList(ints))); |
242 |
for (int i = 0; i < SIZE; ++i) { |
243 |
assertEquals(ints[i], q.poll()); |
244 |
} |
245 |
} |
246 |
|
247 |
/** |
248 |
* put(null) throws NullPointerException |
249 |
*/ |
250 |
public void testPutNull() throws InterruptedException { |
251 |
try { |
252 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
253 |
q.put(null); |
254 |
shouldThrow(); |
255 |
} catch (NullPointerException success) {} |
256 |
} |
257 |
|
258 |
/** |
259 |
* all elements successfully put are contained |
260 |
*/ |
261 |
public void testPut() { |
262 |
LinkedTransferQueue<Integer> q = new LinkedTransferQueue<Integer>(); |
263 |
for (int i = 0; i < SIZE; ++i) { |
264 |
assertEquals(q.size(), i); |
265 |
q.put(i); |
266 |
assertTrue(q.contains(i)); |
267 |
} |
268 |
} |
269 |
|
270 |
/** |
271 |
* take retrieves elements in FIFO order |
272 |
*/ |
273 |
public void testTake() throws InterruptedException { |
274 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
275 |
for (int i = 0; i < SIZE; ++i) { |
276 |
assertEquals(i, (int) q.take()); |
277 |
} |
278 |
} |
279 |
|
280 |
/** |
281 |
* take removes existing elements until empty, then blocks interruptibly |
282 |
*/ |
283 |
public void testBlockingTake() throws InterruptedException { |
284 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
285 |
final CountDownLatch aboutToWait = new CountDownLatch(1); |
286 |
Thread t = newStartedThread(new CheckedRunnable() { |
287 |
public void realRun() throws InterruptedException { |
288 |
for (int i = 0; i < SIZE; ++i) { |
289 |
assertEquals(i, (int) q.take()); |
290 |
} |
291 |
aboutToWait.countDown(); |
292 |
try { |
293 |
q.take(); |
294 |
shouldThrow(); |
295 |
} catch (InterruptedException success) {} |
296 |
}}); |
297 |
|
298 |
aboutToWait.await(); |
299 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
300 |
t.interrupt(); |
301 |
awaitTermination(t, MEDIUM_DELAY_MS); |
302 |
checkEmpty(q); |
303 |
} |
304 |
|
305 |
/** |
306 |
* poll succeeds unless empty |
307 |
*/ |
308 |
public void testPoll() throws InterruptedException { |
309 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
310 |
for (int i = 0; i < SIZE; ++i) { |
311 |
assertEquals(i, (int) q.poll()); |
312 |
} |
313 |
assertNull(q.poll()); |
314 |
checkEmpty(q); |
315 |
} |
316 |
|
317 |
/** |
318 |
* timed poll with zero timeout succeeds when non-empty, else times out |
319 |
*/ |
320 |
public void testTimedPoll0() throws InterruptedException { |
321 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
322 |
for (int i = 0; i < SIZE; ++i) { |
323 |
assertEquals(i, (int) q.poll(0, MILLISECONDS)); |
324 |
} |
325 |
assertNull(q.poll(0, MILLISECONDS)); |
326 |
checkEmpty(q); |
327 |
} |
328 |
|
329 |
/** |
330 |
* timed poll with nonzero timeout succeeds when non-empty, else times out |
331 |
*/ |
332 |
public void testTimedPoll() throws InterruptedException { |
333 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
334 |
for (int i = 0; i < SIZE; ++i) { |
335 |
long t0 = System.nanoTime(); |
336 |
assertEquals(i, (int) q.poll(SMALL_DELAY_MS, MILLISECONDS)); |
337 |
assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS); |
338 |
} |
339 |
long t0 = System.nanoTime(); |
340 |
assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS)); |
341 |
assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS); |
342 |
checkEmpty(q); |
343 |
} |
344 |
|
345 |
/** |
346 |
* Interrupted timed poll throws InterruptedException instead of |
347 |
* returning timeout status |
348 |
*/ |
349 |
public void testInterruptedTimedPoll() throws InterruptedException { |
350 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
351 |
final CountDownLatch aboutToWait = new CountDownLatch(1); |
352 |
Thread t = newStartedThread(new CheckedRunnable() { |
353 |
public void realRun() throws InterruptedException { |
354 |
for (int i = 0; i < SIZE; ++i) { |
355 |
long t0 = System.nanoTime(); |
356 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
357 |
assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS); |
358 |
} |
359 |
long t0 = System.nanoTime(); |
360 |
aboutToWait.countDown(); |
361 |
try { |
362 |
q.poll(MEDIUM_DELAY_MS, MILLISECONDS); |
363 |
shouldThrow(); |
364 |
} catch (InterruptedException success) { |
365 |
assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS); |
366 |
} |
367 |
}}); |
368 |
|
369 |
aboutToWait.await(); |
370 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
371 |
t.interrupt(); |
372 |
awaitTermination(t, MEDIUM_DELAY_MS); |
373 |
checkEmpty(q); |
374 |
} |
375 |
|
376 |
/** |
377 |
* timed poll after thread interrupted throws InterruptedException |
378 |
* instead of returning timeout status |
379 |
*/ |
380 |
public void testTimedPollAfterInterrupt() throws InterruptedException { |
381 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
382 |
Thread t = newStartedThread(new CheckedRunnable() { |
383 |
public void realRun() throws InterruptedException { |
384 |
Thread.currentThread().interrupt(); |
385 |
for (int i = 0; i < SIZE; ++i) { |
386 |
long t0 = System.nanoTime(); |
387 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
388 |
assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS); |
389 |
} |
390 |
try { |
391 |
q.poll(MEDIUM_DELAY_MS, MILLISECONDS); |
392 |
shouldThrow(); |
393 |
} catch (InterruptedException success) {} |
394 |
}}); |
395 |
|
396 |
awaitTermination(t, MEDIUM_DELAY_MS); |
397 |
checkEmpty(q); |
398 |
} |
399 |
|
400 |
/** |
401 |
* peek returns next element, or null if empty |
402 |
*/ |
403 |
public void testPeek() throws InterruptedException { |
404 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
405 |
for (int i = 0; i < SIZE; ++i) { |
406 |
assertEquals(i, (int) q.peek()); |
407 |
assertEquals(i, (int) q.poll()); |
408 |
assertTrue(q.peek() == null || |
409 |
i != (int) q.peek()); |
410 |
} |
411 |
assertNull(q.peek()); |
412 |
checkEmpty(q); |
413 |
} |
414 |
|
415 |
/** |
416 |
* element returns next element, or throws NoSuchElementException if empty |
417 |
*/ |
418 |
public void testElement() throws InterruptedException { |
419 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
420 |
for (int i = 0; i < SIZE; ++i) { |
421 |
assertEquals(i, (int) q.element()); |
422 |
assertEquals(i, (int) q.poll()); |
423 |
} |
424 |
try { |
425 |
q.element(); |
426 |
shouldThrow(); |
427 |
} catch (NoSuchElementException success) {} |
428 |
checkEmpty(q); |
429 |
} |
430 |
|
431 |
/** |
432 |
* remove removes next element, or throws NoSuchElementException if empty |
433 |
*/ |
434 |
public void testRemove() throws InterruptedException { |
435 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
436 |
for (int i = 0; i < SIZE; ++i) { |
437 |
assertEquals(i, (int) q.remove()); |
438 |
} |
439 |
try { |
440 |
q.remove(); |
441 |
shouldThrow(); |
442 |
} catch (NoSuchElementException success) {} |
443 |
checkEmpty(q); |
444 |
} |
445 |
|
446 |
/** |
447 |
* remove(x) removes x and returns true if present |
448 |
*/ |
449 |
public void testRemoveElement() throws InterruptedException { |
450 |
LinkedTransferQueue q = populatedQueue(SIZE); |
451 |
for (int i = 1; i < SIZE; i += 2) { |
452 |
assertTrue(q.remove(i)); |
453 |
} |
454 |
for (int i = 0; i < SIZE; i += 2) { |
455 |
assertTrue(q.remove(i)); |
456 |
assertFalse(q.remove(i + 1)); |
457 |
} |
458 |
checkEmpty(q); |
459 |
} |
460 |
|
461 |
/** |
462 |
* An add following remove(x) succeeds |
463 |
*/ |
464 |
public void testRemoveElementAndAdd() throws InterruptedException { |
465 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
466 |
assertTrue(q.add(one)); |
467 |
assertTrue(q.add(two)); |
468 |
assertTrue(q.remove(one)); |
469 |
assertTrue(q.remove(two)); |
470 |
assertTrue(q.add(three)); |
471 |
assertSame(q.take(), three); |
472 |
} |
473 |
|
474 |
/** |
475 |
* contains(x) reports true when elements added but not yet removed |
476 |
*/ |
477 |
public void testContains() { |
478 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
479 |
for (int i = 0; i < SIZE; ++i) { |
480 |
assertTrue(q.contains(i)); |
481 |
assertEquals(i, (int) q.poll()); |
482 |
assertFalse(q.contains(i)); |
483 |
} |
484 |
} |
485 |
|
486 |
/** |
487 |
* clear removes all elements |
488 |
*/ |
489 |
public void testClear() throws InterruptedException { |
490 |
LinkedTransferQueue q = populatedQueue(SIZE); |
491 |
q.clear(); |
492 |
checkEmpty(q); |
493 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
494 |
q.add(one); |
495 |
assertFalse(q.isEmpty()); |
496 |
assertEquals(1, q.size()); |
497 |
assertTrue(q.contains(one)); |
498 |
q.clear(); |
499 |
checkEmpty(q); |
500 |
} |
501 |
|
502 |
/** |
503 |
* containsAll(c) is true when c contains a subset of elements |
504 |
*/ |
505 |
public void testContainsAll() { |
506 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
507 |
LinkedTransferQueue<Integer> p = new LinkedTransferQueue<Integer>(); |
508 |
for (int i = 0; i < SIZE; ++i) { |
509 |
assertTrue(q.containsAll(p)); |
510 |
assertFalse(p.containsAll(q)); |
511 |
p.add(i); |
512 |
} |
513 |
assertTrue(p.containsAll(q)); |
514 |
} |
515 |
|
516 |
/** |
517 |
* retainAll(c) retains only those elements of c and reports true |
518 |
* if changed |
519 |
*/ |
520 |
public void testRetainAll() { |
521 |
LinkedTransferQueue q = populatedQueue(SIZE); |
522 |
LinkedTransferQueue p = populatedQueue(SIZE); |
523 |
for (int i = 0; i < SIZE; ++i) { |
524 |
boolean changed = q.retainAll(p); |
525 |
if (i == 0) { |
526 |
assertFalse(changed); |
527 |
} else { |
528 |
assertTrue(changed); |
529 |
} |
530 |
assertTrue(q.containsAll(p)); |
531 |
assertEquals(SIZE - i, q.size()); |
532 |
p.remove(); |
533 |
} |
534 |
} |
535 |
|
536 |
/** |
537 |
* removeAll(c) removes only those elements of c and reports true |
538 |
* if changed |
539 |
*/ |
540 |
public void testRemoveAll() { |
541 |
for (int i = 1; i < SIZE; ++i) { |
542 |
LinkedTransferQueue q = populatedQueue(SIZE); |
543 |
LinkedTransferQueue p = populatedQueue(i); |
544 |
assertTrue(q.removeAll(p)); |
545 |
assertEquals(SIZE - i, q.size()); |
546 |
for (int j = 0; j < i; ++j) { |
547 |
assertFalse(q.contains(p.remove())); |
548 |
} |
549 |
} |
550 |
} |
551 |
|
552 |
/** |
553 |
* toArray() contains all elements |
554 |
*/ |
555 |
public void testToArray() throws InterruptedException { |
556 |
LinkedTransferQueue q = populatedQueue(SIZE); |
557 |
Object[] o = q.toArray(); |
558 |
for (int i = 0; i < o.length; i++) { |
559 |
assertEquals(o[i], q.take()); |
560 |
} |
561 |
} |
562 |
|
563 |
/** |
564 |
* toArray(a) contains all elements |
565 |
*/ |
566 |
public void testToArray2() throws InterruptedException { |
567 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
568 |
Integer[] ints = new Integer[SIZE]; |
569 |
ints = q.toArray(ints); |
570 |
for (int i = 0; i < ints.length; i++) { |
571 |
assertEquals(ints[i], q.take()); |
572 |
} |
573 |
} |
574 |
|
575 |
/** |
576 |
* toArray(null) throws NullPointerException |
577 |
*/ |
578 |
public void testToArray_NullArg() { |
579 |
LinkedTransferQueue q = populatedQueue(SIZE); |
580 |
try { |
581 |
q.toArray(null); |
582 |
shouldThrow(); |
583 |
} catch (NullPointerException success) {} |
584 |
} |
585 |
|
586 |
/** |
587 |
* toArray(incompatible array type) throws ArrayStoreException |
588 |
*/ |
589 |
public void testToArray1_BadArg() { |
590 |
LinkedTransferQueue q = populatedQueue(SIZE); |
591 |
try { |
592 |
q.toArray(new String[10]); |
593 |
shouldThrow(); |
594 |
} catch (ArrayStoreException success) {} |
595 |
} |
596 |
|
597 |
/** |
598 |
* iterator iterates through all elements |
599 |
*/ |
600 |
public void testIterator() throws InterruptedException { |
601 |
LinkedTransferQueue q = populatedQueue(SIZE); |
602 |
Iterator it = q.iterator(); |
603 |
int i = 0; |
604 |
while (it.hasNext()) { |
605 |
assertEquals(it.next(), i++); |
606 |
} |
607 |
assertEquals(i, SIZE); |
608 |
} |
609 |
|
610 |
/** |
611 |
* iterator.remove() removes current element |
612 |
*/ |
613 |
public void testIteratorRemove() { |
614 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
615 |
q.add(two); |
616 |
q.add(one); |
617 |
q.add(three); |
618 |
|
619 |
Iterator it = q.iterator(); |
620 |
it.next(); |
621 |
it.remove(); |
622 |
|
623 |
it = q.iterator(); |
624 |
assertSame(it.next(), one); |
625 |
assertSame(it.next(), three); |
626 |
assertFalse(it.hasNext()); |
627 |
} |
628 |
|
629 |
/** |
630 |
* iterator ordering is FIFO |
631 |
*/ |
632 |
public void testIteratorOrdering() { |
633 |
final LinkedTransferQueue<Integer> q |
634 |
= new LinkedTransferQueue<Integer>(); |
635 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
636 |
q.add(one); |
637 |
q.add(two); |
638 |
q.add(three); |
639 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
640 |
int k = 0; |
641 |
for (Integer n : q) { |
642 |
assertEquals(++k, (int) n); |
643 |
} |
644 |
assertEquals(3, k); |
645 |
} |
646 |
|
647 |
/** |
648 |
* Modifications do not cause iterators to fail |
649 |
*/ |
650 |
public void testWeaklyConsistentIteration() { |
651 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
652 |
q.add(one); |
653 |
q.add(two); |
654 |
q.add(three); |
655 |
for (Iterator it = q.iterator(); it.hasNext();) { |
656 |
q.remove(); |
657 |
it.next(); |
658 |
} |
659 |
assertEquals(0, q.size()); |
660 |
} |
661 |
|
662 |
/** |
663 |
* toString contains toStrings of elements |
664 |
*/ |
665 |
public void testToString() { |
666 |
LinkedTransferQueue q = populatedQueue(SIZE); |
667 |
String s = q.toString(); |
668 |
for (int i = 0; i < SIZE; ++i) { |
669 |
assertTrue(s.indexOf(String.valueOf(i)) >= 0); |
670 |
} |
671 |
} |
672 |
|
673 |
/** |
674 |
* offer transfers elements across Executor tasks |
675 |
*/ |
676 |
public void testOfferInExecutor() { |
677 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
678 |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
679 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
680 |
|
681 |
executor.execute(new CheckedRunnable() { |
682 |
public void realRun() throws InterruptedException { |
683 |
threadsStarted.countDown(); |
684 |
threadsStarted.await(); |
685 |
assertTrue(q.offer(one, MEDIUM_DELAY_MS, MILLISECONDS)); |
686 |
}}); |
687 |
|
688 |
executor.execute(new CheckedRunnable() { |
689 |
public void realRun() throws InterruptedException { |
690 |
threadsStarted.countDown(); |
691 |
threadsStarted.await(); |
692 |
assertSame(one, q.take()); |
693 |
checkEmpty(q); |
694 |
}}); |
695 |
|
696 |
joinPool(executor); |
697 |
} |
698 |
|
699 |
/** |
700 |
* timed poll retrieves elements across Executor threads |
701 |
*/ |
702 |
public void testPollInExecutor() { |
703 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
704 |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
705 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
706 |
|
707 |
executor.execute(new CheckedRunnable() { |
708 |
public void realRun() throws InterruptedException { |
709 |
assertNull(q.poll()); |
710 |
threadsStarted.countDown(); |
711 |
threadsStarted.await(); |
712 |
assertSame(one, q.poll(SMALL_DELAY_MS, MILLISECONDS)); |
713 |
checkEmpty(q); |
714 |
}}); |
715 |
|
716 |
executor.execute(new CheckedRunnable() { |
717 |
public void realRun() throws InterruptedException { |
718 |
threadsStarted.countDown(); |
719 |
threadsStarted.await(); |
720 |
q.put(one); |
721 |
}}); |
722 |
|
723 |
joinPool(executor); |
724 |
} |
725 |
|
726 |
/** |
727 |
* A deserialized serialized queue has same elements in same order |
728 |
*/ |
729 |
public void testSerialization() throws Exception { |
730 |
LinkedTransferQueue q = populatedQueue(SIZE); |
731 |
|
732 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
733 |
ObjectOutputStream out |
734 |
= new ObjectOutputStream(new BufferedOutputStream(bout)); |
735 |
out.writeObject(q); |
736 |
out.close(); |
737 |
|
738 |
ByteArrayInputStream bin |
739 |
= new ByteArrayInputStream(bout.toByteArray()); |
740 |
ObjectInputStream in |
741 |
= new ObjectInputStream(new BufferedInputStream(bin)); |
742 |
LinkedTransferQueue r = (LinkedTransferQueue) in.readObject(); |
743 |
|
744 |
assertEquals(q.size(), r.size()); |
745 |
assertEquals(q.toString(), r.toString()); |
746 |
assertTrue(Arrays.equals(q.toArray(), r.toArray())); |
747 |
while (!q.isEmpty()) { |
748 |
assertEquals(q.remove(), r.remove()); |
749 |
} |
750 |
} |
751 |
|
752 |
/** |
753 |
* drainTo(null) throws NullPointerException |
754 |
*/ |
755 |
public void testDrainToNull() { |
756 |
LinkedTransferQueue q = populatedQueue(SIZE); |
757 |
try { |
758 |
q.drainTo(null); |
759 |
shouldThrow(); |
760 |
} catch (NullPointerException success) {} |
761 |
} |
762 |
|
763 |
/** |
764 |
* drainTo(this) throws IllegalArgumentException |
765 |
*/ |
766 |
public void testDrainToSelf() { |
767 |
LinkedTransferQueue q = populatedQueue(SIZE); |
768 |
try { |
769 |
q.drainTo(q); |
770 |
shouldThrow(); |
771 |
} catch (IllegalArgumentException success) {} |
772 |
} |
773 |
|
774 |
/** |
775 |
* drainTo(c) empties queue into another collection c |
776 |
*/ |
777 |
public void testDrainTo() { |
778 |
LinkedTransferQueue q = populatedQueue(SIZE); |
779 |
ArrayList l = new ArrayList(); |
780 |
q.drainTo(l); |
781 |
assertEquals(q.size(), 0); |
782 |
assertEquals(l.size(), SIZE); |
783 |
for (int i = 0; i < SIZE; ++i) { |
784 |
assertEquals(l.get(i), i); |
785 |
} |
786 |
q.add(zero); |
787 |
q.add(one); |
788 |
assertFalse(q.isEmpty()); |
789 |
assertTrue(q.contains(zero)); |
790 |
assertTrue(q.contains(one)); |
791 |
l.clear(); |
792 |
q.drainTo(l); |
793 |
assertEquals(q.size(), 0); |
794 |
assertEquals(l.size(), 2); |
795 |
for (int i = 0; i < 2; ++i) { |
796 |
assertEquals(l.get(i), i); |
797 |
} |
798 |
} |
799 |
|
800 |
/** |
801 |
* drainTo(c) empties full queue, unblocking a waiting put. |
802 |
*/ |
803 |
public void testDrainToWithActivePut() throws InterruptedException { |
804 |
final LinkedTransferQueue q = populatedQueue(SIZE); |
805 |
Thread t = newStartedThread(new CheckedRunnable() { |
806 |
public void realRun() { |
807 |
q.put(SIZE + 1); |
808 |
}}); |
809 |
ArrayList l = new ArrayList(); |
810 |
q.drainTo(l); |
811 |
assertTrue(l.size() >= SIZE); |
812 |
for (int i = 0; i < SIZE; ++i) { |
813 |
assertEquals(l.get(i), i); |
814 |
} |
815 |
awaitTermination(t, MEDIUM_DELAY_MS); |
816 |
assertTrue(q.size() + l.size() >= SIZE); |
817 |
} |
818 |
|
819 |
/** |
820 |
* drainTo(null, n) throws NullPointerException |
821 |
*/ |
822 |
public void testDrainToNullN() { |
823 |
LinkedTransferQueue q = populatedQueue(SIZE); |
824 |
try { |
825 |
q.drainTo(null, SIZE); |
826 |
shouldThrow(); |
827 |
} catch (NullPointerException success) {} |
828 |
} |
829 |
|
830 |
/** |
831 |
* drainTo(this, n) throws IllegalArgumentException |
832 |
*/ |
833 |
public void testDrainToSelfN() { |
834 |
LinkedTransferQueue q = populatedQueue(SIZE); |
835 |
try { |
836 |
q.drainTo(q, SIZE); |
837 |
shouldThrow(); |
838 |
} catch (IllegalArgumentException success) {} |
839 |
} |
840 |
|
841 |
/** |
842 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
843 |
*/ |
844 |
public void testDrainToN() { |
845 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
846 |
for (int i = 0; i < SIZE + 2; ++i) { |
847 |
for (int j = 0; j < SIZE; j++) { |
848 |
assertTrue(q.offer(j)); |
849 |
} |
850 |
ArrayList l = new ArrayList(); |
851 |
q.drainTo(l, i); |
852 |
int k = (i < SIZE) ? i : SIZE; |
853 |
assertEquals(l.size(), k); |
854 |
assertEquals(q.size(), SIZE - k); |
855 |
for (int j = 0; j < k; ++j) { |
856 |
assertEquals(l.get(j), j); |
857 |
} |
858 |
while (q.poll() != null) |
859 |
; |
860 |
} |
861 |
} |
862 |
|
863 |
/** |
864 |
* timed poll() or take() increments the waiting consumer count; |
865 |
* offer(e) decrements the waiting consumer count |
866 |
*/ |
867 |
public void testWaitingConsumer() throws InterruptedException { |
868 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
869 |
assertEquals(q.getWaitingConsumerCount(), 0); |
870 |
assertFalse(q.hasWaitingConsumer()); |
871 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
872 |
|
873 |
Thread t = newStartedThread(new CheckedRunnable() { |
874 |
public void realRun() throws InterruptedException { |
875 |
threadStarted.countDown(); |
876 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
877 |
assertEquals(q.getWaitingConsumerCount(), 0); |
878 |
assertFalse(q.hasWaitingConsumer()); |
879 |
}}); |
880 |
|
881 |
threadStarted.await(); |
882 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
883 |
assertEquals(q.getWaitingConsumerCount(), 1); |
884 |
assertTrue(q.hasWaitingConsumer()); |
885 |
|
886 |
assertTrue(q.offer(one)); |
887 |
assertEquals(q.getWaitingConsumerCount(), 0); |
888 |
assertFalse(q.hasWaitingConsumer()); |
889 |
|
890 |
awaitTermination(t, MEDIUM_DELAY_MS); |
891 |
} |
892 |
|
893 |
/** |
894 |
* transfer(null) throws NullPointerException |
895 |
*/ |
896 |
public void testTransfer1() throws InterruptedException { |
897 |
try { |
898 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
899 |
q.transfer(null); |
900 |
shouldThrow(); |
901 |
} catch (NullPointerException success) {} |
902 |
} |
903 |
|
904 |
/** |
905 |
* transfer waits until a poll occurs. The transfered element |
906 |
* is returned by this associated poll. |
907 |
*/ |
908 |
public void testTransfer2() throws InterruptedException { |
909 |
final LinkedTransferQueue<Integer> q |
910 |
= new LinkedTransferQueue<Integer>(); |
911 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
912 |
|
913 |
Thread t = newStartedThread(new CheckedRunnable() { |
914 |
public void realRun() throws InterruptedException { |
915 |
threadStarted.countDown(); |
916 |
q.transfer(five); |
917 |
checkEmpty(q); |
918 |
}}); |
919 |
|
920 |
threadStarted.await(); |
921 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
922 |
assertEquals(1, q.size()); |
923 |
assertSame(five, q.poll()); |
924 |
checkEmpty(q); |
925 |
awaitTermination(t, MEDIUM_DELAY_MS); |
926 |
} |
927 |
|
928 |
/** |
929 |
* transfer waits until a poll occurs, and then transfers in fifo order |
930 |
*/ |
931 |
public void testTransfer3() throws InterruptedException { |
932 |
final LinkedTransferQueue<Integer> q |
933 |
= new LinkedTransferQueue<Integer>(); |
934 |
|
935 |
Thread first = newStartedThread(new CheckedRunnable() { |
936 |
public void realRun() throws InterruptedException { |
937 |
q.transfer(four); |
938 |
assertTrue(!q.contains(four)); |
939 |
assertEquals(1, q.size()); |
940 |
}}); |
941 |
|
942 |
Thread interruptedThread = newStartedThread( |
943 |
new CheckedInterruptedRunnable() { |
944 |
public void realRun() throws InterruptedException { |
945 |
while (q.isEmpty()) |
946 |
Thread.yield(); |
947 |
q.transfer(five); |
948 |
}}); |
949 |
|
950 |
while (q.size() < 2) |
951 |
Thread.yield(); |
952 |
assertEquals(2, q.size()); |
953 |
assertSame(four, q.poll()); |
954 |
first.join(); |
955 |
assertEquals(1, q.size()); |
956 |
interruptedThread.interrupt(); |
957 |
interruptedThread.join(); |
958 |
checkEmpty(q); |
959 |
} |
960 |
|
961 |
/** |
962 |
* transfer waits until a poll occurs, at which point the polling |
963 |
* thread returns the element |
964 |
*/ |
965 |
public void testTransfer4() throws InterruptedException { |
966 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
967 |
|
968 |
Thread t = newStartedThread(new CheckedRunnable() { |
969 |
public void realRun() throws InterruptedException { |
970 |
q.transfer(four); |
971 |
assertFalse(q.contains(four)); |
972 |
assertSame(three, q.poll()); |
973 |
}}); |
974 |
|
975 |
while (q.isEmpty()) |
976 |
Thread.yield(); |
977 |
assertFalse(q.isEmpty()); |
978 |
assertEquals(1, q.size()); |
979 |
assertTrue(q.offer(three)); |
980 |
assertSame(four, q.poll()); |
981 |
awaitTermination(t, MEDIUM_DELAY_MS); |
982 |
} |
983 |
|
984 |
/** |
985 |
* transfer waits until a take occurs. The transfered element |
986 |
* is returned by this associated take. |
987 |
*/ |
988 |
public void testTransfer5() throws InterruptedException { |
989 |
final LinkedTransferQueue<Integer> q |
990 |
= new LinkedTransferQueue<Integer>(); |
991 |
|
992 |
Thread t = newStartedThread(new CheckedRunnable() { |
993 |
public void realRun() throws InterruptedException { |
994 |
q.transfer(four); |
995 |
checkEmpty(q); |
996 |
}}); |
997 |
|
998 |
while (q.isEmpty()) |
999 |
Thread.yield(); |
1000 |
assertFalse(q.isEmpty()); |
1001 |
assertEquals(1, q.size()); |
1002 |
assertSame(four, q.take()); |
1003 |
checkEmpty(q); |
1004 |
awaitTermination(t, MEDIUM_DELAY_MS); |
1005 |
} |
1006 |
|
1007 |
/** |
1008 |
* tryTransfer(null) throws NullPointerException |
1009 |
*/ |
1010 |
public void testTryTransfer1() { |
1011 |
try { |
1012 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
1013 |
q.tryTransfer(null); |
1014 |
shouldThrow(); |
1015 |
} catch (NullPointerException success) {} |
1016 |
} |
1017 |
|
1018 |
/** |
1019 |
* tryTransfer returns false and does not enqueue if there are no |
1020 |
* consumers waiting to poll or take. |
1021 |
*/ |
1022 |
public void testTryTransfer2() throws InterruptedException { |
1023 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
1024 |
assertFalse(q.tryTransfer(new Object())); |
1025 |
assertFalse(q.hasWaitingConsumer()); |
1026 |
checkEmpty(q); |
1027 |
} |
1028 |
|
1029 |
/** |
1030 |
* If there is a consumer waiting in timed poll, tryTransfer |
1031 |
* returns true while successfully transfering object. |
1032 |
*/ |
1033 |
public void testTryTransfer3() throws InterruptedException { |
1034 |
final Object hotPotato = new Object(); |
1035 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
1036 |
|
1037 |
Thread t = newStartedThread(new CheckedRunnable() { |
1038 |
public void realRun() { |
1039 |
while (! q.hasWaitingConsumer()) |
1040 |
Thread.yield(); |
1041 |
assertTrue(q.hasWaitingConsumer()); |
1042 |
checkEmpty(q); |
1043 |
assertTrue(q.tryTransfer(hotPotato)); |
1044 |
}}); |
1045 |
|
1046 |
assertSame(hotPotato, q.poll(MEDIUM_DELAY_MS, MILLISECONDS)); |
1047 |
checkEmpty(q); |
1048 |
awaitTermination(t, MEDIUM_DELAY_MS); |
1049 |
} |
1050 |
|
1051 |
/** |
1052 |
* If there is a consumer waiting in take, tryTransfer returns |
1053 |
* true while successfully transfering object. |
1054 |
*/ |
1055 |
public void testTryTransfer4() throws InterruptedException { |
1056 |
final Object hotPotato = new Object(); |
1057 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
1058 |
|
1059 |
Thread t = newStartedThread(new CheckedRunnable() { |
1060 |
public void realRun() { |
1061 |
while (! q.hasWaitingConsumer()) |
1062 |
Thread.yield(); |
1063 |
assertTrue(q.hasWaitingConsumer()); |
1064 |
checkEmpty(q); |
1065 |
assertTrue(q.tryTransfer(hotPotato)); |
1066 |
}}); |
1067 |
|
1068 |
assertSame(q.take(), hotPotato); |
1069 |
checkEmpty(q); |
1070 |
awaitTermination(t, MEDIUM_DELAY_MS); |
1071 |
} |
1072 |
|
1073 |
/** |
1074 |
* tryTransfer waits the amount given if interrupted, and |
1075 |
* throws interrupted exception |
1076 |
*/ |
1077 |
public void testTryTransfer5() throws InterruptedException { |
1078 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
1079 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
1080 |
|
1081 |
Thread t = newStartedThread(new CheckedRunnable() { |
1082 |
public void realRun() throws InterruptedException { |
1083 |
long t0 = System.nanoTime(); |
1084 |
threadStarted.countDown(); |
1085 |
try { |
1086 |
q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS); |
1087 |
shouldThrow(); |
1088 |
} catch (InterruptedException success) {} |
1089 |
assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS); |
1090 |
}}); |
1091 |
|
1092 |
threadStarted.await(); |
1093 |
Thread.sleep(SHORT_DELAY_MS); |
1094 |
t.interrupt(); |
1095 |
awaitTermination(t, MEDIUM_DELAY_MS); |
1096 |
checkEmpty(q); |
1097 |
} |
1098 |
|
1099 |
/** |
1100 |
* tryTransfer gives up after the timeout and returns false |
1101 |
*/ |
1102 |
public void testTryTransfer6() throws InterruptedException { |
1103 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
1104 |
|
1105 |
Thread t = newStartedThread(new CheckedRunnable() { |
1106 |
public void realRun() throws InterruptedException { |
1107 |
long t0 = System.nanoTime(); |
1108 |
assertFalse(q.tryTransfer(new Object(), |
1109 |
SHORT_DELAY_MS, MILLISECONDS)); |
1110 |
assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS); |
1111 |
checkEmpty(q); |
1112 |
}}); |
1113 |
|
1114 |
awaitTermination(t, MEDIUM_DELAY_MS); |
1115 |
checkEmpty(q); |
1116 |
} |
1117 |
|
1118 |
/** |
1119 |
* tryTransfer waits for any elements previously in to be removed |
1120 |
* before transfering to a poll or take |
1121 |
*/ |
1122 |
public void testTryTransfer7() throws InterruptedException { |
1123 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
1124 |
assertTrue(q.offer(four)); |
1125 |
|
1126 |
Thread t = newStartedThread(new CheckedRunnable() { |
1127 |
public void realRun() throws InterruptedException { |
1128 |
assertTrue(q.tryTransfer(five, MEDIUM_DELAY_MS, MILLISECONDS)); |
1129 |
checkEmpty(q); |
1130 |
}}); |
1131 |
|
1132 |
while (q.size() != 2) |
1133 |
Thread.yield(); |
1134 |
assertEquals(2, q.size()); |
1135 |
assertSame(four, q.poll()); |
1136 |
assertSame(five, q.poll()); |
1137 |
checkEmpty(q); |
1138 |
awaitTermination(t, MEDIUM_DELAY_MS); |
1139 |
} |
1140 |
|
1141 |
/** |
1142 |
* tryTransfer attempts to enqueue into the q and fails returning |
1143 |
* false not enqueueing and the successive poll is null |
1144 |
*/ |
1145 |
public void testTryTransfer8() throws InterruptedException { |
1146 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
1147 |
assertTrue(q.offer(four)); |
1148 |
assertEquals(1, q.size()); |
1149 |
long t0 = System.nanoTime(); |
1150 |
assertFalse(q.tryTransfer(five, SHORT_DELAY_MS, MILLISECONDS)); |
1151 |
assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS); |
1152 |
assertEquals(1, q.size()); |
1153 |
assertSame(four, q.poll()); |
1154 |
assertNull(q.poll()); |
1155 |
checkEmpty(q); |
1156 |
} |
1157 |
|
1158 |
private LinkedTransferQueue<Integer> populatedQueue(int n) { |
1159 |
LinkedTransferQueue<Integer> q = new LinkedTransferQueue<Integer>(); |
1160 |
checkEmpty(q); |
1161 |
for (int i = 0; i < n; i++) { |
1162 |
assertEquals(i, q.size()); |
1163 |
assertTrue(q.offer(i)); |
1164 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
1165 |
} |
1166 |
assertFalse(q.isEmpty()); |
1167 |
return q; |
1168 |
} |
1169 |
} |