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