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root/jsr166/jsr166/src/test/tck/LinkedTransferQueueTest.java

Comparing jsr166/src/test/tck/LinkedTransferQueueTest.java (file contents):
Revision 1.10 by jsr166, Thu Aug 6 03:55:39 2009 UTC vs.
Revision 1.63 by jsr166, Sun Oct 4 18:49:02 2015 UTC

#	Line 1 | Line 1
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
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
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;
8	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
9	>
10		import java.util.ArrayList;
11		import java.util.Arrays;
12	<	import java.util.ConcurrentModificationException;
12	>	import java.util.Collection;
13		import java.util.Iterator;
14	+	import java.util.List;
15		import java.util.NoSuchElementException;
16	<	import java.util.concurrent.*;
17	<	import static java.util.concurrent.TimeUnit.MILLISECONDS;
16	>	import java.util.Queue;
17	>	import java.util.concurrent.BlockingQueue;
18	>	import java.util.concurrent.CountDownLatch;
19	>	import java.util.concurrent.Executors;
20	>	import java.util.concurrent.ExecutorService;
21	>	import java.util.concurrent.LinkedTransferQueue;
22	>
23		import junit.framework.Test;
22	–	import junit.framework.TestSuite;
24
25		@SuppressWarnings({"unchecked", "rawtypes"})
26		public class LinkedTransferQueueTest extends JSR166TestCase {
27	+	static class Implementation implements CollectionImplementation {
28	+	public Class<?> klazz() { return LinkedTransferQueue.class; }
29	+	public Collection emptyCollection() { return new LinkedTransferQueue(); }
30	+	public Object makeElement(int i) { return i; }
31	+	public boolean isConcurrent() { return true; }
32	+	public boolean permitsNulls() { return false; }
33	+	}
34	+
35	+	public static class Generic extends BlockingQueueTest {
36	+	protected BlockingQueue emptyCollection() {
37	+	return new LinkedTransferQueue();
38	+	}
39	+	}
40
41		public static void main(String[] args) {
42	<	junit.textui.TestRunner.run(suite());
42	>	main(suite(), args);
43		}
44
45		public static Test suite() {
46	<	return new TestSuite(LinkedTransferQueueTest.class);
46	>	return newTestSuite(LinkedTransferQueueTest.class,
47	>	new Generic().testSuite(),
48	>	CollectionTest.testSuite(new Implementation()));
49		}
50
51		/**
#	Line 49 | Line 65 | public class LinkedTransferQueueTest ext
65		try {
66		new LinkedTransferQueue(null);
67		shouldThrow();
68	<	} catch (NullPointerException success) {
53	<	}
68	>	} catch (NullPointerException success) {}
69		}
70
71		/**
#	Line 58 | Line 73 | public class LinkedTransferQueueTest ext
73		* NullPointerException
74		*/
75		public void testConstructor3() {
76	+	Collection<Integer> elements = Arrays.asList(new Integer[SIZE]);
77		try {
78	<	Integer[] ints = new Integer[SIZE];
63	<	new LinkedTransferQueue(Arrays.asList(ints));
78	>	new LinkedTransferQueue(elements);
79		shouldThrow();
80	<	} catch (NullPointerException success) {
66	<	}
80	>	} catch (NullPointerException success) {}
81		}
82
83		/**
#	Line 71 | Line 85 | public class LinkedTransferQueueTest ext
85		* throws NullPointerException
86		*/
87		public void testConstructor4() {
88	+	Integer[] ints = new Integer[SIZE];
89	+	for (int i = 0; i < SIZE - 1; ++i)
90	+	ints[i] = i;
91	+	Collection<Integer> elements = Arrays.asList(ints);
92		try {
93	<	Integer[] ints = new Integer[SIZE];
76	<	for (int i = 0; i < SIZE - 1; ++i) {
77	<	ints[i] = i;
78	<	}
79	<	new LinkedTransferQueue(Arrays.asList(ints));
93	>	new LinkedTransferQueue(elements);
94		shouldThrow();
95	<	} catch (NullPointerException success) {
82	<	}
95	>	} catch (NullPointerException success) {}
96		}
97
98		/**
99		* Queue contains all elements of the collection it is initialized by
100		*/
101		public void testConstructor5() {
102	<	try {
103	<	Integer[] ints = new Integer[SIZE];
104	<	for (int i = 0; i < SIZE; ++i) {
105	<	ints[i] = i;
106	<	}
107	<	LinkedTransferQueue q
108	<	= new LinkedTransferQueue(Arrays.asList(ints));
109	<	for (int i = 0; i < SIZE; ++i) {
110	<	assertEquals(ints[i], q.poll());
111	<	}
112	<	} finally {
102	>	Integer[] ints = new Integer[SIZE];
103	>	for (int i = 0; i < SIZE; ++i) {
104	>	ints[i] = i;
105	>	}
106	>	List intList = Arrays.asList(ints);
107	>	LinkedTransferQueue q
108	>	= new LinkedTransferQueue(intList);
109	>	assertEquals(q.size(), intList.size());
110	>	assertEquals(q.toString(), intList.toString());
111	>	assertTrue(Arrays.equals(q.toArray(),
112	>	intList.toArray()));
113	>	assertTrue(Arrays.equals(q.toArray(new Object[0]),
114	>	intList.toArray(new Object[0])));
115	>	assertTrue(Arrays.equals(q.toArray(new Object[SIZE]),
116	>	intList.toArray(new Object[SIZE])));
117	>	for (int i = 0; i < SIZE; ++i) {
118	>	assertEquals(ints[i], q.poll());
119		}
120		}
121
122		/**
123	<	* Remaining capacity never decrease nor increase on add or remove
123	>	* remainingCapacity() always returns Integer.MAX_VALUE
124		*/
125		public void testRemainingCapacity() {
126	<	LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
126	>	BlockingQueue q = populatedQueue(SIZE);
127		for (int i = 0; i < SIZE; ++i) {
128		assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
129		assertEquals(SIZE - i, q.size());
130	<	q.remove();
130	>	assertEquals(i, q.remove());
131		}
132		for (int i = 0; i < SIZE; ++i) {
133		assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
134		assertEquals(i, q.size());
135	<	q.add(i);
117	<	}
118	<	}
119	<
120	<	/**
121	<	* offer(null) throws NullPointerException
122	<	*/
123	<	public void testOfferNull() {
124	<	try {
125	<	LinkedTransferQueue q = new LinkedTransferQueue();
126	<	q.offer(null);
127	<	shouldThrow();
128	<	} catch (NullPointerException success) {
129	<	}
130	<	}
131	<
132	<	/**
133	<	* add(null) throws NullPointerException
134	<	*/
135	<	public void testAddNull() {
136	<	try {
137	<	LinkedTransferQueue q = new LinkedTransferQueue();
138	<	q.add(null);
139	<	shouldThrow();
140	<	} catch (NullPointerException success) {
141	<	}
142	<	}
143	<
144	<	/**
145	<	* addAll(null) throws NullPointerException
146	<	*/
147	<	public void testAddAll1() {
148	<	try {
149	<	LinkedTransferQueue q = new LinkedTransferQueue();
150	<	q.addAll(null);
151	<	shouldThrow();
152	<	} catch (NullPointerException success) {
135	>	assertTrue(q.add(i));
136		}
137		}
138
#	Line 157 | Line 140 | public class LinkedTransferQueueTest ext
140		* addAll(this) throws IllegalArgumentException
141		*/
142		public void testAddAllSelf() {
143	+	LinkedTransferQueue q = populatedQueue(SIZE);
144		try {
161	–	LinkedTransferQueue q = populatedQueue(SIZE);
145		q.addAll(q);
146		shouldThrow();
147	<	} catch (IllegalArgumentException success) {
165	<	}
166	<	}
167	<
168	<	/**
169	<	* addAll of a collection with null elements throws NullPointerException
170	<	*/
171	<	public void testAddAll2() {
172	<	try {
173	<	LinkedTransferQueue q = new LinkedTransferQueue();
174	<	Integer[] ints = new Integer[SIZE];
175	<	q.addAll(Arrays.asList(ints));
176	<	shouldThrow();
177	<	} catch (NullPointerException success) {
178	<	}
147	>	} catch (IllegalArgumentException success) {}
148		}
149
150		/**
#	Line 183 | Line 152 | public class LinkedTransferQueueTest ext
152		* NullPointerException after possibly adding some elements
153		*/
154		public void testAddAll3() {
155	+	LinkedTransferQueue q = new LinkedTransferQueue();
156	+	Integer[] ints = new Integer[SIZE];
157	+	for (int i = 0; i < SIZE - 1; ++i)
158	+	ints[i] = i;
159		try {
187	–	LinkedTransferQueue q = new LinkedTransferQueue();
188	–	Integer[] ints = new Integer[SIZE];
189	–	for (int i = 0; i < SIZE - 1; ++i) {
190	–	ints[i] = i;
191	–	}
160		q.addAll(Arrays.asList(ints));
161		shouldThrow();
162	<	} catch (NullPointerException success) {
195	<	}
162	>	} catch (NullPointerException success) {}
163		}
164
165		/**
#	Line 213 | Line 180 | public class LinkedTransferQueueTest ext
180		}
181
182		/**
216	–	* put(null) throws NullPointerException
217	–	*/
218	–	public void testPutNull() throws InterruptedException {
219	–	try {
220	–	LinkedTransferQueue q = new LinkedTransferQueue();
221	–	q.put(null);
222	–	shouldThrow();
223	–	} catch (NullPointerException success) {}
224	–	}
225	–
226	–	/**
183		* all elements successfully put are contained
184		*/
185		public void testPut() {
186		LinkedTransferQueue<Integer> q = new LinkedTransferQueue<Integer>();
187		for (int i = 0; i < SIZE; ++i) {
188	+	assertEquals(i, q.size());
189		q.put(i);
190		assertTrue(q.contains(i));
191		}
235	–	assertEquals(q.size(), SIZE);
192		}
193
194		/**
#	Line 246 | Line 202 | public class LinkedTransferQueueTest ext
202		}
203
204		/**
205	<	* take blocks interruptibly when empty
250	<	*/
251	<	public void testTakeFromEmpty() throws InterruptedException {
252	<	final LinkedTransferQueue q = new LinkedTransferQueue();
253	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
254	<	void realRun() throws InterruptedException {
255	<	q.take();
256	<	}});
257	<	Thread.sleep(SHORT_DELAY_MS);
258	<	t.interrupt();
259	<	t.join();
260	<	}
261	<
262	<	/**
263	<	* Take removes existing elements until empty, then blocks interruptibly
205	>	* take removes existing elements until empty, then blocks interruptibly
206		*/
207		public void testBlockingTake() throws InterruptedException {
208	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
209	<	void realRun() throws InterruptedException {
210	<	LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
208	>	final BlockingQueue q = populatedQueue(SIZE);
209	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
210	>	Thread t = newStartedThread(new CheckedRunnable() {
211	>	public void realRun() throws InterruptedException {
212		for (int i = 0; i < SIZE; ++i) {
213	<	threadAssertEquals(i, (int) q.take());
213	>	assertEquals(i, q.take());
214		}
215	<	q.take();
215	>
216	>	Thread.currentThread().interrupt();
217	>	try {
218	>	q.take();
219	>	shouldThrow();
220	>	} catch (InterruptedException success) {}
221	>	assertFalse(Thread.interrupted());
222	>
223	>	pleaseInterrupt.countDown();
224	>	try {
225	>	q.take();
226	>	shouldThrow();
227	>	} catch (InterruptedException success) {}
228	>	assertFalse(Thread.interrupted());
229		}});
230	<	Thread.sleep(SHORT_DELAY_MS);
230	>
231	>	await(pleaseInterrupt);
232	>	assertThreadStaysAlive(t);
233		t.interrupt();
234	<	t.join();
234	>	awaitTermination(t);
235		}
236
237		/**
238		* poll succeeds unless empty
239		*/
240	<	public void testPoll() {
240	>	public void testPoll() throws InterruptedException {
241		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
242		for (int i = 0; i < SIZE; ++i) {
243		assertEquals(i, (int) q.poll());
244		}
245		assertNull(q.poll());
246	+	checkEmpty(q);
247		}
248
249		/**
250	<	* timed pool with zero timeout succeeds when non-empty, else times out
250	>	* timed poll with zero timeout succeeds when non-empty, else times out
251		*/
252		public void testTimedPoll0() throws InterruptedException {
253		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
#	Line 296 | Line 255 | public class LinkedTransferQueueTest ext
255		assertEquals(i, (int) q.poll(0, MILLISECONDS));
256		}
257		assertNull(q.poll(0, MILLISECONDS));
258	+	checkEmpty(q);
259		}
260
261		/**
262	<	* timed pool with nonzero timeout succeeds when non-empty, else times out
262	>	* timed poll with nonzero timeout succeeds when non-empty, else times out
263		*/
264		public void testTimedPoll() throws InterruptedException {
265		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
266		for (int i = 0; i < SIZE; ++i) {
267	<	assertEquals(i, (int) q.poll(SHORT_DELAY_MS, MILLISECONDS));
268	<	}
269	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
267	>	long startTime = System.nanoTime();
268	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
269	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
270	>	}
271	>	long startTime = System.nanoTime();
272	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
273	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
274	>	checkEmpty(q);
275		}
276
277		/**
#	Line 314 | Line 279 | public class LinkedTransferQueueTest ext
279		* returning timeout status
280		*/
281		public void testInterruptedTimedPoll() throws InterruptedException {
282	<	final LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
283	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
284	<	void realRun() throws InterruptedException {
282	>	final BlockingQueue<Integer> q = populatedQueue(SIZE);
283	>	final CountDownLatch aboutToWait = new CountDownLatch(1);
284	>	Thread t = newStartedThread(new CheckedRunnable() {
285	>	public void realRun() throws InterruptedException {
286		for (int i = 0; i < SIZE; ++i) {
287	<	threadAssertEquals(i, (int) q.poll(LONG_DELAY_MS,
288	<	MILLISECONDS));
287	>	long t0 = System.nanoTime();
288	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
289	>	assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS);
290	>	}
291	>	long t0 = System.nanoTime();
292	>	aboutToWait.countDown();
293	>	try {
294	>	q.poll(MEDIUM_DELAY_MS, MILLISECONDS);
295	>	shouldThrow();
296	>	} catch (InterruptedException success) {
297	>	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
298		}
324	–	q.poll(LONG_DELAY_MS, MILLISECONDS);
299		}});
300	<	Thread.sleep(SMALL_DELAY_MS);
300	>
301	>	aboutToWait.await();
302	>	waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
303		t.interrupt();
304	<	t.join();
305	<	assertEquals(q.size(), 0);
330	<	assertNull(q.poll());
304	>	awaitTermination(t, MEDIUM_DELAY_MS);
305	>	checkEmpty(q);
306		}
307
308		/**
309	<	* timed poll before a delayed offer fails; after offer succeeds;
310	<	* on interruption throws
309	>	* timed poll after thread interrupted throws InterruptedException
310	>	* instead of returning timeout status
311		*/
312	<	public void testTimedPollWithOffer() throws InterruptedException {
313	<	final LinkedTransferQueue q = new LinkedTransferQueue();
314	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
315	<	void realRun() throws InterruptedException {
316	<	threadAssertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
317	<	q.poll(LONG_DELAY_MS, MILLISECONDS);
318	<	q.poll(LONG_DELAY_MS, MILLISECONDS);
312	>	public void testTimedPollAfterInterrupt() throws InterruptedException {
313	>	final BlockingQueue<Integer> q = populatedQueue(SIZE);
314	>	Thread t = newStartedThread(new CheckedRunnable() {
315	>	public void realRun() throws InterruptedException {
316	>	Thread.currentThread().interrupt();
317	>	for (int i = 0; i < SIZE; ++i) {
318	>	long t0 = System.nanoTime();
319	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
320	>	assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS);
321	>	}
322	>	try {
323	>	q.poll(MEDIUM_DELAY_MS, MILLISECONDS);
324	>	shouldThrow();
325	>	} catch (InterruptedException success) {}
326		}});
327	<	Thread.sleep(SMALL_DELAY_MS);
328	<	assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS));
329	<	t.interrupt();
348	<	t.join();
327	>
328	>	awaitTermination(t, MEDIUM_DELAY_MS);
329	>	checkEmpty(q);
330		}
331
332		/**
333		* peek returns next element, or null if empty
334		*/
335	<	public void testPeek() {
335	>	public void testPeek() throws InterruptedException {
336		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
337		for (int i = 0; i < SIZE; ++i) {
338		assertEquals(i, (int) q.peek());
#	Line 360 | Line 341 | public class LinkedTransferQueueTest ext
341		i != (int) q.peek());
342		}
343		assertNull(q.peek());
344	+	checkEmpty(q);
345		}
346
347		/**
348		* element returns next element, or throws NoSuchElementException if empty
349		*/
350	<	public void testElement() {
350	>	public void testElement() throws InterruptedException {
351		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
352		for (int i = 0; i < SIZE; ++i) {
353		assertEquals(i, (int) q.element());
#	Line 374 | Line 356 | public class LinkedTransferQueueTest ext
356		try {
357		q.element();
358		shouldThrow();
359	<	} catch (NoSuchElementException success) {
360	<	}
359	>	} catch (NoSuchElementException success) {}
360	>	checkEmpty(q);
361		}
362
363		/**
364		* remove removes next element, or throws NoSuchElementException if empty
365		*/
366	<	public void testRemove() {
366	>	public void testRemove() throws InterruptedException {
367		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
368		for (int i = 0; i < SIZE; ++i) {
369		assertEquals(i, (int) q.remove());
#	Line 389 | Line 371 | public class LinkedTransferQueueTest ext
371		try {
372		q.remove();
373		shouldThrow();
374	<	} catch (NoSuchElementException success) {
375	<	}
394	<	}
395	<
396	<	/**
397	<	* remove(x) removes x and returns true if present
398	<	*/
399	<	public void testRemoveElement() {
400	<	LinkedTransferQueue q = populatedQueue(SIZE);
401	<	for (int i = 1; i < SIZE; i += 2) {
402	<	assertTrue(q.remove(i));
403	<	}
404	<	for (int i = 0; i < SIZE; i += 2) {
405	<	assertTrue(q.remove(i));
406	<	assertFalse(q.remove(i + 1));
407	<	}
408	<	assertTrue(q.isEmpty());
374	>	} catch (NoSuchElementException success) {}
375	>	checkEmpty(q);
376		}
377
378		/**
#	Line 418 | Line 385 | public class LinkedTransferQueueTest ext
385		assertTrue(q.remove(one));
386		assertTrue(q.remove(two));
387		assertTrue(q.add(three));
388	<	assertTrue(q.take() != null);
388	>	assertSame(q.take(), three);
389		}
390
391		/**
#	Line 436 | Line 403 | public class LinkedTransferQueueTest ext
403		/**
404		* clear removes all elements
405		*/
406	<	public void testClear() {
406	>	public void testClear() throws InterruptedException {
407		LinkedTransferQueue q = populatedQueue(SIZE);
408		q.clear();
409	<	assertTrue(q.isEmpty());
443	<	assertEquals(0, q.size());
409	>	checkEmpty(q);
410		assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
411		q.add(one);
412		assertFalse(q.isEmpty());
413	+	assertEquals(1, q.size());
414		assertTrue(q.contains(one));
415		q.clear();
416	<	assertTrue(q.isEmpty());
416	>	checkEmpty(q);
417		}
418
419		/**
#	Line 500 | Line 467 | public class LinkedTransferQueueTest ext
467		}
468
469		/**
470	<	* toArray contains all elements
470	>	* toArray() contains all elements in FIFO order
471		*/
472	<	public void testToArray() throws InterruptedException {
472	>	public void testToArray() {
473		LinkedTransferQueue q = populatedQueue(SIZE);
474		Object[] o = q.toArray();
475		for (int i = 0; i < o.length; i++) {
476	<	assertEquals(o[i], q.take());
476	>	assertSame(o[i], q.poll());
477		}
478		}
479
480		/**
481	<	* toArray(a) contains all elements
481	>	* toArray(a) contains all elements in FIFO order
482		*/
483	<	public void testToArray2() throws InterruptedException {
483	>	public void testToArray2() {
484		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
485		Integer[] ints = new Integer[SIZE];
486	<	ints = q.toArray(ints);
486	>	Integer[] array = q.toArray(ints);
487	>	assertSame(ints, array);
488		for (int i = 0; i < ints.length; i++) {
489	<	assertEquals(ints[i], q.take());
489	>	assertSame(ints[i], q.poll());
490		}
491		}
492
493		/**
494	<	* toArray(null) throws NullPointerException
527	<	*/
528	<	public void testToArray_BadArg() {
529	<	try {
530	<	LinkedTransferQueue q = populatedQueue(SIZE);
531	<	Object o[] = q.toArray(null);
532	<	shouldThrow();
533	<	} catch (NullPointerException success) {
534	<	}
535	<	}
536	<
537	<	/**
538	<	* toArray with incompatible array type throws CCE
494	>	* toArray(incompatible array type) throws ArrayStoreException
495		*/
496		public void testToArray1_BadArg() {
497	+	LinkedTransferQueue q = populatedQueue(SIZE);
498		try {
499	<	LinkedTransferQueue q = populatedQueue(SIZE);
543	<	Object o[] = q.toArray(new String[10]);
499	>	q.toArray(new String[10]);
500		shouldThrow();
501	<	} catch (ArrayStoreException success) {
546	<	}
501	>	} catch (ArrayStoreException success) {}
502		}
503
504		/**
#	Line 552 | Line 507 | public class LinkedTransferQueueTest ext
507		public void testIterator() throws InterruptedException {
508		LinkedTransferQueue q = populatedQueue(SIZE);
509		Iterator it = q.iterator();
510	<	int i = 0;
511	<	while (it.hasNext()) {
512	<	assertEquals(it.next(), i++);
513	<	}
510	>	int i;
511	>	for (i = 0; it.hasNext(); i++)
512	>	assertTrue(q.contains(it.next()));
513	>	assertEquals(i, SIZE);
514	>	assertIteratorExhausted(it);
515	>
516	>	it = q.iterator();
517	>	for (i = 0; it.hasNext(); i++)
518	>	assertEquals(it.next(), q.take());
519		assertEquals(i, SIZE);
520	+	assertIteratorExhausted(it);
521		}
522
523		/**
524	<	* iterator.remove removes current element
524	>	* iterator of empty collection has no elements
525	>	*/
526	>	public void testEmptyIterator() {
527	>	assertIteratorExhausted(new LinkedTransferQueue().iterator());
528	>	}
529	>
530	>	/**
531	>	* iterator.remove() removes current element
532		*/
533		public void testIteratorRemove() {
534		final LinkedTransferQueue q = new LinkedTransferQueue();
#	Line 573 | Line 541 | public class LinkedTransferQueueTest ext
541		it.remove();
542
543		it = q.iterator();
544	<	assertEquals(it.next(), one);
545	<	assertEquals(it.next(), three);
544	>	assertSame(it.next(), one);
545	>	assertSame(it.next(), three);
546		assertFalse(it.hasNext());
547		}
548
#	Line 618 | Line 586 | public class LinkedTransferQueueTest ext
586		LinkedTransferQueue q = populatedQueue(SIZE);
587		String s = q.toString();
588		for (int i = 0; i < SIZE; ++i) {
589	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
589	>	assertTrue(s.contains(String.valueOf(i)));
590		}
591		}
592
#	Line 627 | Line 595 | public class LinkedTransferQueueTest ext
595		*/
596		public void testOfferInExecutor() {
597		final LinkedTransferQueue q = new LinkedTransferQueue();
598	<	q.add(one);
599	<	q.add(two);
600	<	ExecutorService executor = Executors.newFixedThreadPool(2);
601	<
602	<	executor.execute(new CheckedRunnable() {
603	<	void realRun() {
604	<	threadAssertTrue(q.offer(three, MEDIUM_DELAY_MS,
605	<	MILLISECONDS));
606	<	}});
639	<
640	<	executor.execute(new CheckedRunnable() {
641	<	void realRun() throws InterruptedException {
642	<	Thread.sleep(SMALL_DELAY_MS);
643	<	threadAssertEquals(one, q.take());
644	<	}});
598	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
599	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
600	>	try (PoolCleaner cleaner = cleaner(executor)) {
601	>
602	>	executor.execute(new CheckedRunnable() {
603	>	public void realRun() throws InterruptedException {
604	>	threadsStarted.await();
605	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
606	>	}});
607
608	<	joinPool(executor);
608	>	executor.execute(new CheckedRunnable() {
609	>	public void realRun() throws InterruptedException {
610	>	threadsStarted.await();
611	>	assertSame(one, q.take());
612	>	checkEmpty(q);
613	>	}});
614	>	}
615		}
616
617		/**
618	<	* poll retrieves elements across Executor threads
618	>	* timed poll retrieves elements across Executor threads
619		*/
620		public void testPollInExecutor() {
621		final LinkedTransferQueue q = new LinkedTransferQueue();
622	<	ExecutorService executor = Executors.newFixedThreadPool(2);
623	<
624	<	executor.execute(new CheckedRunnable() {
625	<	void realRun() throws InterruptedException {
626	<	threadAssertNull(q.poll());
627	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS,
628	<	MILLISECONDS));
629	<	threadAssertTrue(q.isEmpty());
630	<	}});
631	<
632	<	executor.execute(new CheckedRunnable() {
665	<	void realRun() throws InterruptedException {
666	<	Thread.sleep(SMALL_DELAY_MS);
667	<	q.put(one);
668	<	}});
622	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
623	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
624	>	try (PoolCleaner cleaner = cleaner(executor)) {
625	>
626	>	executor.execute(new CheckedRunnable() {
627	>	public void realRun() throws InterruptedException {
628	>	assertNull(q.poll());
629	>	threadsStarted.await();
630	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
631	>	checkEmpty(q);
632	>	}});
633
634	<	joinPool(executor);
634	>	executor.execute(new CheckedRunnable() {
635	>	public void realRun() throws InterruptedException {
636	>	threadsStarted.await();
637	>	q.put(one);
638	>	}});
639	>	}
640		}
641
642		/**
643		* A deserialized serialized queue has same elements in same order
644		*/
645		public void testSerialization() throws Exception {
646	<	LinkedTransferQueue q = populatedQueue(SIZE);
647	<
679	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
680	<	ObjectOutputStream out
681	<	= new ObjectOutputStream(new BufferedOutputStream(bout));
682	<	out.writeObject(q);
683	<	out.close();
646	>	Queue x = populatedQueue(SIZE);
647	>	Queue y = serialClone(x);
648
649	<	ByteArrayInputStream bin
650	<	= new ByteArrayInputStream(bout.toByteArray());
651	<	ObjectInputStream in
652	<	= new ObjectInputStream(new BufferedInputStream(bin));
653	<	LinkedTransferQueue r = (LinkedTransferQueue) in.readObject();
654	<
655	<	assertEquals(q.size(), r.size());
692	<	while (!q.isEmpty()) {
693	<	assertEquals(q.remove(), r.remove());
694	<	}
695	<	}
696	<
697	<	/**
698	<	* drainTo(null) throws NullPointerException
699	<	*/
700	<	public void testDrainToNull() {
701	<	LinkedTransferQueue q = populatedQueue(SIZE);
702	<	try {
703	<	q.drainTo(null);
704	<	shouldThrow();
705	<	} catch (NullPointerException success) {
706	<	}
707	<	}
708	<
709	<	/**
710	<	* drainTo(this) throws IllegalArgumentException
711	<	*/
712	<	public void testDrainToSelf() {
713	<	LinkedTransferQueue q = populatedQueue(SIZE);
714	<	try {
715	<	q.drainTo(q);
716	<	shouldThrow();
717	<	} catch (IllegalArgumentException success) {
649	>	assertNotSame(y, x);
650	>	assertEquals(x.size(), y.size());
651	>	assertEquals(x.toString(), y.toString());
652	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
653	>	while (!x.isEmpty()) {
654	>	assertFalse(y.isEmpty());
655	>	assertEquals(x.remove(), y.remove());
656		}
657	+	assertTrue(y.isEmpty());
658		}
659
660		/**
#	Line 725 | Line 664 | public class LinkedTransferQueueTest ext
664		LinkedTransferQueue q = populatedQueue(SIZE);
665		ArrayList l = new ArrayList();
666		q.drainTo(l);
667	<	assertEquals(q.size(), 0);
668	<	assertEquals(l.size(), SIZE);
667	>	assertEquals(0, q.size());
668	>	assertEquals(SIZE, l.size());
669		for (int i = 0; i < SIZE; ++i) {
670	<	assertEquals(l.get(i), i);
670	>	assertEquals(i, l.get(i));
671		}
672		q.add(zero);
673		q.add(one);
#	Line 737 | Line 676 | public class LinkedTransferQueueTest ext
676		assertTrue(q.contains(one));
677		l.clear();
678		q.drainTo(l);
679	<	assertEquals(q.size(), 0);
680	<	assertEquals(l.size(), 2);
679	>	assertEquals(0, q.size());
680	>	assertEquals(2, l.size());
681		for (int i = 0; i < 2; ++i) {
682	<	assertEquals(l.get(i), i);
682	>	assertEquals(i, l.get(i));
683		}
684		}
685
686		/**
687	<	* drainTo empties full queue, unblocking a waiting put.
687	>	* drainTo(c) empties full queue, unblocking a waiting put.
688		*/
689		public void testDrainToWithActivePut() throws InterruptedException {
690		final LinkedTransferQueue q = populatedQueue(SIZE);
691		Thread t = newStartedThread(new CheckedRunnable() {
692	<	void realRun() {
692	>	public void realRun() {
693		q.put(SIZE + 1);
694		}});
695		ArrayList l = new ArrayList();
696		q.drainTo(l);
697		assertTrue(l.size() >= SIZE);
698	<	for (int i = 0; i < SIZE; ++i) {
699	<	assertEquals(l.get(i), i);
700	<	}
762	<	t.join();
698	>	for (int i = 0; i < SIZE; ++i)
699	>	assertEquals(i, l.get(i));
700	>	awaitTermination(t, MEDIUM_DELAY_MS);
701		assertTrue(q.size() + l.size() >= SIZE);
702		}
703
704		/**
705	<	* drainTo(null, n) throws NullPointerException
768	<	*/
769	<	public void testDrainToNullN() {
770	<	LinkedTransferQueue q = populatedQueue(SIZE);
771	<	try {
772	<	q.drainTo(null, 0);
773	<	shouldThrow();
774	<	} catch (NullPointerException success) {
775	<	}
776	<	}
777	<
778	<	/**
779	<	* drainTo(this, n) throws IllegalArgumentException
780	<	*/
781	<	public void testDrainToSelfN() {
782	<	LinkedTransferQueue q = populatedQueue(SIZE);
783	<	try {
784	<	q.drainTo(q, 0);
785	<	shouldThrow();
786	<	} catch (IllegalArgumentException success) {
787	<	}
788	<	}
789	<
790	<	/**
791	<	* drainTo(c, n) empties first max {n, size} elements of queue into c
705	>	* drainTo(c, n) empties first min(n, size) elements of queue into c
706		*/
707		public void testDrainToN() {
708		LinkedTransferQueue q = new LinkedTransferQueue();
#	Line 799 | Line 713 | public class LinkedTransferQueueTest ext
713		ArrayList l = new ArrayList();
714		q.drainTo(l, i);
715		int k = (i < SIZE) ? i : SIZE;
716	<	assertEquals(l.size(), k);
717	<	assertEquals(q.size(), SIZE - k);
718	<	for (int j = 0; j < k; ++j) {
719	<	assertEquals(l.get(j), j);
720	<	}
807	<	while (q.poll() != null)
808	<	;
716	>	assertEquals(k, l.size());
717	>	assertEquals(SIZE - k, q.size());
718	>	for (int j = 0; j < k; ++j)
719	>	assertEquals(j, l.get(j));
720	>	do {} while (q.poll() != null);
721		}
722		}
723
724		/**
725	<	* poll and take decrement the waiting consumer count
725	>	* timed poll() or take() increments the waiting consumer count;
726	>	* offer(e) decrements the waiting consumer count
727		*/
728		public void testWaitingConsumer() throws InterruptedException {
729		final LinkedTransferQueue q = new LinkedTransferQueue();
730	<	final ConsumerObserver waiting = new ConsumerObserver();
730	>	assertEquals(0, q.getWaitingConsumerCount());
731	>	assertFalse(q.hasWaitingConsumer());
732	>	final CountDownLatch threadStarted = new CountDownLatch(1);
733
734		Thread t = newStartedThread(new CheckedRunnable() {
735	<	void realRun() throws InterruptedException {
736	<	Thread.sleep(SMALL_DELAY_MS);
737	<	threadAssertTrue(q.hasWaitingConsumer());
738	<	waiting.setWaitingConsumer(q.getWaitingConsumerCount());
739	<	threadAssertTrue(q.offer(new Object()));
735	>	public void realRun() throws InterruptedException {
736	>	threadStarted.countDown();
737	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
738	>	assertEquals(0, q.getWaitingConsumerCount());
739	>	assertFalse(q.hasWaitingConsumer());
740		}});
741
742	<	assertTrue(q.poll(LONG_DELAY_MS, MILLISECONDS) != null);
743	<	assertTrue(q.getWaitingConsumerCount()
744	<	< waiting.getWaitingConsumers());
745	<	t.join();
742	>	threadStarted.await();
743	>	waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
744	>	assertEquals(1, q.getWaitingConsumerCount());
745	>	assertTrue(q.hasWaitingConsumer());
746	>
747	>	assertTrue(q.offer(one));
748	>	assertEquals(0, q.getWaitingConsumerCount());
749	>	assertFalse(q.hasWaitingConsumer());
750	>
751	>	awaitTermination(t, MEDIUM_DELAY_MS);
752		}
753
754		/**
#	Line 838 | Line 759 | public class LinkedTransferQueueTest ext
759		LinkedTransferQueue q = new LinkedTransferQueue();
760		q.transfer(null);
761		shouldThrow();
762	<	} catch (NullPointerException ex) {
842	<	}
762	>	} catch (NullPointerException success) {}
763		}
764
765		/**
#	Line 849 | Line 769 | public class LinkedTransferQueueTest ext
769		public void testTransfer2() throws InterruptedException {
770		final LinkedTransferQueue<Integer> q
771		= new LinkedTransferQueue<Integer>();
772	+	final CountDownLatch threadStarted = new CountDownLatch(1);
773
774		Thread t = newStartedThread(new CheckedRunnable() {
775	<	void realRun() throws InterruptedException {
776	<	q.transfer(SIZE);
777	<	threadAssertTrue(q.isEmpty());
775	>	public void realRun() throws InterruptedException {
776	>	threadStarted.countDown();
777	>	q.transfer(five);
778	>	checkEmpty(q);
779		}});
780
781	<	Thread.sleep(SHORT_DELAY_MS);
781	>	threadStarted.await();
782	>	waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
783		assertEquals(1, q.size());
784	<	assertEquals(SIZE, (int) q.poll());
785	<	assertTrue(q.isEmpty());
786	<	t.join();
784	>	assertSame(five, q.poll());
785	>	checkEmpty(q);
786	>	awaitTermination(t, MEDIUM_DELAY_MS);
787		}
788
789		/**
#	Line 871 | Line 794 | public class LinkedTransferQueueTest ext
794		= new LinkedTransferQueue<Integer>();
795
796		Thread first = newStartedThread(new CheckedRunnable() {
797	<	void realRun() throws InterruptedException {
798	<	Integer i = SIZE + 1;
799	<	q.transfer(i);
800	<	threadAssertTrue(!q.contains(i));
878	<	threadAssertEquals(1, q.size());
797	>	public void realRun() throws InterruptedException {
798	>	q.transfer(four);
799	>	assertTrue(!q.contains(four));
800	>	assertEquals(1, q.size());
801		}});
802
803		Thread interruptedThread = newStartedThread(
804		new CheckedInterruptedRunnable() {
805	<	void realRun() throws InterruptedException {
806	<	while (q.size() == 0)
805	>	public void realRun() throws InterruptedException {
806	>	while (q.isEmpty())
807		Thread.yield();
808	<	q.transfer(SIZE);
808	>	q.transfer(five);
809		}});
810
811		while (q.size() < 2)
812		Thread.yield();
813		assertEquals(2, q.size());
814	<	assertEquals(SIZE + 1, (int) q.poll());
814	>	assertSame(four, q.poll());
815		first.join();
816		assertEquals(1, q.size());
817		interruptedThread.interrupt();
818		interruptedThread.join();
819	<	assertEquals(0, q.size());
898	<	assertTrue(q.isEmpty());
819	>	checkEmpty(q);
820		}
821
822		/**
#	Line 906 | Line 827 | public class LinkedTransferQueueTest ext
827		final LinkedTransferQueue q = new LinkedTransferQueue();
828
829		Thread t = newStartedThread(new CheckedRunnable() {
830	<	void realRun() throws InterruptedException {
830	>	public void realRun() throws InterruptedException {
831		q.transfer(four);
832	<	threadAssertFalse(q.contains(four));
833	<	threadAssertEquals(three, q.poll());
832	>	assertFalse(q.contains(four));
833	>	assertSame(three, q.poll());
834		}});
835
836	<	Thread.sleep(SHORT_DELAY_MS);
836	>	while (q.isEmpty())
837	>	Thread.yield();
838	>	assertFalse(q.isEmpty());
839	>	assertEquals(1, q.size());
840		assertTrue(q.offer(three));
841	<	assertEquals(four, q.poll());
842	<	t.join();
841	>	assertSame(four, q.poll());
842	>	awaitTermination(t, MEDIUM_DELAY_MS);
843		}
844
845		/**
#	Line 927 | Line 851 | public class LinkedTransferQueueTest ext
851		= new LinkedTransferQueue<Integer>();
852
853		Thread t = newStartedThread(new CheckedRunnable() {
854	<	void realRun() throws InterruptedException {
855	<	q.transfer(SIZE);
856	<	threadAssertTrue(q.isEmpty());
854	>	public void realRun() throws InterruptedException {
855	>	q.transfer(four);
856	>	checkEmpty(q);
857		}});
858
859	<	Thread.sleep(SHORT_DELAY_MS);
860	<	assertEquals(SIZE, (int) q.take());
861	<	assertTrue(q.isEmpty());
862	<	t.join();
859	>	while (q.isEmpty())
860	>	Thread.yield();
861	>	assertFalse(q.isEmpty());
862	>	assertEquals(1, q.size());
863	>	assertSame(four, q.take());
864	>	checkEmpty(q);
865	>	awaitTermination(t, MEDIUM_DELAY_MS);
866		}
867
868		/**
869		* tryTransfer(null) throws NullPointerException
870		*/
871		public void testTryTransfer1() {
872	+	final LinkedTransferQueue q = new LinkedTransferQueue();
873		try {
946	–	final LinkedTransferQueue q = new LinkedTransferQueue();
874		q.tryTransfer(null);
875		shouldThrow();
876	<	} catch (NullPointerException ex) {
950	<	}
876	>	} catch (NullPointerException success) {}
877		}
878
879		/**
880		* tryTransfer returns false and does not enqueue if there are no
881		* consumers waiting to poll or take.
882		*/
883	<	public void testTryTransfer2() {
883	>	public void testTryTransfer2() throws InterruptedException {
884		final LinkedTransferQueue q = new LinkedTransferQueue();
885		assertFalse(q.tryTransfer(new Object()));
886		assertFalse(q.hasWaitingConsumer());
887	<	assertTrue(q.isEmpty());
962	<	assertEquals(0, q.size());
887	>	checkEmpty(q);
888		}
889
890		/**
#	Line 971 | Line 896 | public class LinkedTransferQueueTest ext
896		final LinkedTransferQueue q = new LinkedTransferQueue();
897
898		Thread t = newStartedThread(new CheckedRunnable() {
899	<	void realRun() {
899	>	public void realRun() {
900		while (! q.hasWaitingConsumer())
901		Thread.yield();
902	<	threadAssertTrue(q.hasWaitingConsumer());
903	<	threadAssertTrue(q.isEmpty());
904	<	threadAssertTrue(q.size() == 0);
980	<	threadAssertTrue(q.tryTransfer(hotPotato));
902	>	assertTrue(q.hasWaitingConsumer());
903	>	checkEmpty(q);
904	>	assertTrue(q.tryTransfer(hotPotato));
905		}});
906
907	<	assertTrue(q.poll(MEDIUM_DELAY_MS, MILLISECONDS) == hotPotato);
908	<	assertTrue(q.isEmpty());
909	<	t.join();
907	>	assertSame(hotPotato, q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
908	>	checkEmpty(q);
909	>	awaitTermination(t, MEDIUM_DELAY_MS);
910		}
911
912		/**
#	Line 994 | Line 918 | public class LinkedTransferQueueTest ext
918		final LinkedTransferQueue q = new LinkedTransferQueue();
919
920		Thread t = newStartedThread(new CheckedRunnable() {
921	<	void realRun() {
921	>	public void realRun() {
922		while (! q.hasWaitingConsumer())
923		Thread.yield();
924	<	threadAssertTrue(q.hasWaitingConsumer());
925	<	threadAssertTrue(q.isEmpty());
926	<	threadAssertTrue(q.size() == 0);
1003	<	threadAssertTrue(q.tryTransfer(hotPotato));
924	>	assertTrue(q.hasWaitingConsumer());
925	>	checkEmpty(q);
926	>	assertTrue(q.tryTransfer(hotPotato));
927		}});
928
929	<	assertTrue(q.take() == hotPotato);
930	<	assertTrue(q.isEmpty());
931	<	t.join();
929	>	assertSame(q.take(), hotPotato);
930	>	checkEmpty(q);
931	>	awaitTermination(t, MEDIUM_DELAY_MS);
932		}
933
934		/**
935	<	* tryTransfer waits the amount given if interrupted, and
1013	<	* throws interrupted exception
935	>	* tryTransfer blocks interruptibly if no takers
936		*/
937		public void testTryTransfer5() throws InterruptedException {
938		final LinkedTransferQueue q = new LinkedTransferQueue();
939	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
940	+	assertTrue(q.isEmpty());
941
942	<	Thread toInterrupt = newStartedThread(new CheckedInterruptedRunnable() {
943	<	void realRun() throws InterruptedException {
944	<	q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS);
942	>	Thread t = newStartedThread(new CheckedRunnable() {
943	>	public void realRun() throws InterruptedException {
944	>	Thread.currentThread().interrupt();
945	>	try {
946	>	q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS);
947	>	shouldThrow();
948	>	} catch (InterruptedException success) {}
949	>	assertFalse(Thread.interrupted());
950	>
951	>	pleaseInterrupt.countDown();
952	>	try {
953	>	q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS);
954	>	shouldThrow();
955	>	} catch (InterruptedException success) {}
956	>	assertFalse(Thread.interrupted());
957		}});
958
959	<	Thread.sleep(SMALL_DELAY_MS);
960	<	toInterrupt.interrupt();
961	<	toInterrupt.join();
959	>	await(pleaseInterrupt);
960	>	assertThreadStaysAlive(t);
961	>	t.interrupt();
962	>	awaitTermination(t);
963	>	checkEmpty(q);
964		}
965
966		/**
967	<	* tryTransfer gives up after the timeout and return false
967	>	* tryTransfer gives up after the timeout and returns false
968		*/
969		public void testTryTransfer6() throws InterruptedException {
970		final LinkedTransferQueue q = new LinkedTransferQueue();
971
972		Thread t = newStartedThread(new CheckedRunnable() {
973	<	void realRun() throws InterruptedException {
974	<	threadAssertFalse
975	<	(q.tryTransfer(new Object(),
976	<	SHORT_DELAY_MS, MILLISECONDS));
973	>	public void realRun() throws InterruptedException {
974	>	long t0 = System.nanoTime();
975	>	assertFalse(q.tryTransfer(new Object(),
976	>	timeoutMillis(), MILLISECONDS));
977	>	assertTrue(millisElapsedSince(t0) >= timeoutMillis());
978	>	checkEmpty(q);
979		}});
980
981	<	Thread.sleep(SMALL_DELAY_MS);
982	<	assertTrue(q.isEmpty());
1043	<	t.join();
981	>	awaitTermination(t);
982	>	checkEmpty(q);
983		}
984
985		/**
#	Line 1052 | Line 991 | public class LinkedTransferQueueTest ext
991		assertTrue(q.offer(four));
992
993		Thread t = newStartedThread(new CheckedRunnable() {
994	<	void realRun() throws InterruptedException {
995	<	threadAssertTrue(q.tryTransfer(five,
996	<	MEDIUM_DELAY_MS, MILLISECONDS));
1058	<	threadAssertTrue(q.isEmpty());
994	>	public void realRun() throws InterruptedException {
995	>	assertTrue(q.tryTransfer(five, MEDIUM_DELAY_MS, MILLISECONDS));
996	>	checkEmpty(q);
997		}});
998
999	<	Thread.sleep(SHORT_DELAY_MS);
999	>	while (q.size() != 2)
1000	>	Thread.yield();
1001		assertEquals(2, q.size());
1002	<	assertEquals(four, q.poll());
1003	<	assertEquals(five, q.poll());
1004	<	assertTrue(q.isEmpty());
1005	<	t.join();
1002	>	assertSame(four, q.poll());
1003	>	assertSame(five, q.poll());
1004	>	checkEmpty(q);
1005	>	awaitTermination(t, MEDIUM_DELAY_MS);
1006		}
1007
1008		/**
1009	<	* tryTransfer attempts to enqueue into the q and fails returning
1010	<	* false not enqueueing and the successive poll is null
1009	>	* tryTransfer attempts to enqueue into the queue and fails
1010	>	* returning false not enqueueing and the successive poll is null
1011		*/
1012		public void testTryTransfer8() throws InterruptedException {
1013		final LinkedTransferQueue q = new LinkedTransferQueue();
1014		assertTrue(q.offer(four));
1015		assertEquals(1, q.size());
1016	<	assertFalse(q.tryTransfer(five, SHORT_DELAY_MS, MILLISECONDS));
1016	>	long t0 = System.nanoTime();
1017	>	assertFalse(q.tryTransfer(five, timeoutMillis(), MILLISECONDS));
1018	>	assertTrue(millisElapsedSince(t0) >= timeoutMillis());
1019		assertEquals(1, q.size());
1020	<	assertEquals(four, q.poll());
1080	<	threadAssertTrue(q.isEmpty());
1020	>	assertSame(four, q.poll());
1021		assertNull(q.poll());
1022	+	checkEmpty(q);
1023		}
1024
1025		private LinkedTransferQueue<Integer> populatedQueue(int n) {
1026		LinkedTransferQueue<Integer> q = new LinkedTransferQueue<Integer>();
1027	<	assertTrue(q.isEmpty());
1027	>	checkEmpty(q);
1028		for (int i = 0; i < n; i++) {
1029		assertEquals(i, q.size());
1030		assertTrue(q.offer(i));
#	Line 1093 | Line 1034 | public class LinkedTransferQueueTest ext
1034		return q;
1035		}
1036
1037	<	private static class ConsumerObserver {
1038	<
1039	<	private int waitingConsumers;
1040	<
1041	<	private ConsumerObserver() {
1042	<	}
1043	<
1044	<	private void setWaitingConsumer(int i) {
1045	<	this.waitingConsumers = i;
1046	<	}
1047	<
1048	<	private int getWaitingConsumers() {
1108	<	return waitingConsumers;
1037	>	/**
1038	>	* remove(null), contains(null) always return false
1039	>	*/
1040	>	public void testNeverContainsNull() {
1041	>	Collection<?>[] qs = {
1042	>	new LinkedTransferQueue<Object>(),
1043	>	populatedQueue(2),
1044	>	};
1045	>
1046	>	for (Collection<?> q : qs) {
1047	>	assertFalse(q.contains(null));
1048	>	assertFalse(q.remove(null));
1049		}
1050		}
1051		}

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