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Comparing jsr166/src/test/tck/SynchronousQueueTest.java (file contents):
Revision 1.35 by jsr166, Fri May 27 20:07:24 2011 UTC vs.
Revision 1.63 by jsr166, Sun Aug 11 22:29:27 2019 UTC

#	Line 6 | Line 6
6		* Pat Fisher, Mike Judd.
7		*/
8
9	–	import junit.framework.*;
10	–	import java.util.*;
11	–	import java.util.concurrent.*;
9		import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	<	import java.io.*;
10	>
11	>	import java.util.ArrayList;
12	>	import java.util.Arrays;
13	>	import java.util.Collection;
14	>	import java.util.Iterator;
15	>	import java.util.NoSuchElementException;
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.SynchronousQueue;
21	>	import java.util.concurrent.ThreadLocalRandom;
22	>
23	>	import junit.framework.Test;
24
25		public class SynchronousQueueTest extends JSR166TestCase {
26
#	Line 27 | Line 37 | public class SynchronousQueueTest extend
37		}
38
39		public static void main(String[] args) {
40	<	junit.textui.TestRunner.run(suite());
40	>	main(suite(), args);
41		}
42
43		public static Test suite() {
#	Line 50 | Line 60 | public class SynchronousQueueTest extend
60		}
61
62		/**
53	–	* offer(null) throws NPE
54	–	*/
55	–	public void testOfferNull() {
56	–	try {
57	–	SynchronousQueue q = new SynchronousQueue();
58	–	q.offer(null);
59	–	shouldThrow();
60	–	} catch (NullPointerException success) {}
61	–	}
62	–
63	–	/**
64	–	* add(null) throws NPE
65	–	*/
66	–	public void testAddNull() {
67	–	try {
68	–	SynchronousQueue q = new SynchronousQueue();
69	–	q.add(null);
70	–	shouldThrow();
71	–	} catch (NullPointerException success) {}
72	–	}
73	–
74	–	/**
63		* offer fails if no active taker
64		*/
65	<	public void testOffer() {
66	<	SynchronousQueue q = new SynchronousQueue();
65	>	public void testOffer()      { testOffer(false); }
66	>	public void testOffer_fair() { testOffer(true); }
67	>	public void testOffer(boolean fair) {
68	>	SynchronousQueue q = new SynchronousQueue(fair);
69		assertFalse(q.offer(one));
70		}
71
72		/**
73	<	* add throws ISE if no active taker
73	>	* add throws IllegalStateException if no active taker
74		*/
75	<	public void testAdd() {
75	>	public void testAdd()      { testAdd(false); }
76	>	public void testAdd_fair() { testAdd(true); }
77	>	public void testAdd(boolean fair) {
78	>	SynchronousQueue q = new SynchronousQueue(fair);
79	>	assertEquals(0, q.remainingCapacity());
80		try {
87	–	SynchronousQueue q = new SynchronousQueue();
88	–	assertEquals(0, q.remainingCapacity());
81		q.add(one);
82		shouldThrow();
83		} catch (IllegalStateException success) {}
84		}
85
86		/**
87	<	* addAll(null) throws NPE
87	>	* addAll(this) throws IllegalArgumentException
88		*/
89	<	public void testAddAll1() {
89	>	public void testAddAll_self()      { testAddAll_self(false); }
90	>	public void testAddAll_self_fair() { testAddAll_self(true); }
91	>	public void testAddAll_self(boolean fair) {
92	>	SynchronousQueue q = new SynchronousQueue(fair);
93		try {
99	–	SynchronousQueue q = new SynchronousQueue();
100	–	q.addAll(null);
101	–	shouldThrow();
102	–	} catch (NullPointerException success) {}
103	–	}
104	–
105	–	/**
106	–	* addAll(this) throws IAE
107	–	*/
108	–	public void testAddAllSelf() {
109	–	try {
110	–	SynchronousQueue q = new SynchronousQueue();
94		q.addAll(q);
95		shouldThrow();
96		} catch (IllegalArgumentException success) {}
97		}
98
99		/**
100	<	* addAll of a collection with null elements throws NPE
118	<	*/
119	<	public void testAddAll2() {
120	<	try {
121	<	SynchronousQueue q = new SynchronousQueue();
122	<	Integer[] ints = new Integer[1];
123	<	q.addAll(Arrays.asList(ints));
124	<	shouldThrow();
125	<	} catch (NullPointerException success) {}
126	<	}
127	<
128	<	/**
129	<	* addAll throws ISE if no active taker
100	>	* addAll throws IllegalStateException if no active taker
101		*/
102	<	public void testAddAll4() {
102	>	public void testAddAll_ISE()      { testAddAll_ISE(false); }
103	>	public void testAddAll_ISE_fair() { testAddAll_ISE(true); }
104	>	public void testAddAll_ISE(boolean fair) {
105	>	SynchronousQueue q = new SynchronousQueue(fair);
106	>	Integer[] ints = new Integer[1];
107	>	for (int i = 0; i < ints.length; i++)
108	>	ints[i] = i;
109	>	Collection<Integer> coll = Arrays.asList(ints);
110		try {
111	<	SynchronousQueue q = new SynchronousQueue();
134	<	Integer[] ints = new Integer[1];
135	<	for (int i = 0; i < 1; ++i)
136	<	ints[i] = new Integer(i);
137	<	q.addAll(Arrays.asList(ints));
111	>	q.addAll(coll);
112		shouldThrow();
113		} catch (IllegalStateException success) {}
114		}
115
116		/**
143	–	* put(null) throws NPE
144	–	*/
145	–	public void testPutNull() throws InterruptedException {
146	–	try {
147	–	SynchronousQueue q = new SynchronousQueue();
148	–	q.put(null);
149	–	shouldThrow();
150	–	} catch (NullPointerException success) {}
151	–	}
152	–
153	–	/**
117		* put blocks interruptibly if no active taker
118		*/
119		public void testBlockingPut()      { testBlockingPut(false); }
#	Line 176 | Line 139 | public class SynchronousQueueTest extend
139		}});
140
141		await(pleaseInterrupt);
142	<	assertThreadStaysAlive(t);
142	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
143		t.interrupt();
144		awaitTermination(t);
145		assertEquals(0, q.remainingCapacity());
#	Line 196 | Line 159 | public class SynchronousQueueTest extend
159		pleaseTake.countDown();
160		q.put(one);
161
162	+	Thread.currentThread().interrupt();
163	+	try {
164	+	q.put(99);
165	+	shouldThrow();
166	+	} catch (InterruptedException success) {}
167	+	assertFalse(Thread.interrupted());
168	+
169		pleaseInterrupt.countDown();
170		try {
171		q.put(99);
#	Line 205 | Line 175 | public class SynchronousQueueTest extend
175		}});
176
177		await(pleaseTake);
178	<	assertEquals(q.remainingCapacity(), 0);
178	>	assertEquals(0, q.remainingCapacity());
179		try { assertSame(one, q.take()); }
180		catch (InterruptedException e) { threadUnexpectedException(e); }
181
182		await(pleaseInterrupt);
183	<	assertThreadStaysAlive(t);
183	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
184		t.interrupt();
185		awaitTermination(t);
186	<	assertEquals(q.remainingCapacity(), 0);
186	>	assertEquals(0, q.remainingCapacity());
187		}
188
189		/**
190		* timed offer times out if elements not taken
191		*/
192	<	public void testTimedOffer()      { testTimedOffer(false); }
193	<	public void testTimedOffer_fair() { testTimedOffer(true); }
224	<	public void testTimedOffer(boolean fair) {
192	>	public void testTimedOffer() {
193	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
194		final SynchronousQueue q = new SynchronousQueue(fair);
195		final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
196		Thread t = newStartedThread(new CheckedRunnable() {
197		public void realRun() throws InterruptedException {
198		long startTime = System.nanoTime();
199	+
200		assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
201		assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
202	+
203	+	Thread.currentThread().interrupt();
204	+	try {
205	+	q.offer(new Object(), randomTimeout(), randomTimeUnit());
206	+	shouldThrow();
207	+	} catch (InterruptedException success) {}
208	+	assertFalse(Thread.interrupted());
209	+
210		pleaseInterrupt.countDown();
211		try {
212	<	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
212	>	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
213		shouldThrow();
214		} catch (InterruptedException success) {}
215	+	assertFalse(Thread.interrupted());
216	+
217	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
218		}});
219
220		await(pleaseInterrupt);
221	<	assertThreadStaysAlive(t);
221	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
222		t.interrupt();
223		awaitTermination(t);
224		}
#	Line 245 | Line 226 | public class SynchronousQueueTest extend
226		/**
227		* poll return null if no active putter
228		*/
229	<	public void testPoll() {
230	<	SynchronousQueue q = new SynchronousQueue();
229	>	public void testPoll()      { testPoll(false); }
230	>	public void testPoll_fair() { testPoll(true); }
231	>	public void testPoll(boolean fair) {
232	>	final SynchronousQueue q = new SynchronousQueue(fair);
233		assertNull(q.poll());
234		}
235
236		/**
237		* timed poll with zero timeout times out if no active putter
238		*/
239	<	public void testTimedPoll0() throws InterruptedException {
240	<	SynchronousQueue q = new SynchronousQueue();
241	<	assertNull(q.poll(0, MILLISECONDS));
239	>	public void testTimedPoll0()      { testTimedPoll0(false); }
240	>	public void testTimedPoll0_fair() { testTimedPoll0(true); }
241	>	public void testTimedPoll0(boolean fair) {
242	>	final SynchronousQueue q = new SynchronousQueue(fair);
243	>	try { assertNull(q.poll(0, MILLISECONDS)); }
244	>	catch (InterruptedException e) { threadUnexpectedException(e); }
245		}
246
247		/**
248		* timed poll with nonzero timeout times out if no active putter
249		*/
250	<	public void testTimedPoll() throws InterruptedException {
251	<	SynchronousQueue q = new SynchronousQueue();
252	<	long startTime = System.nanoTime();
253	<	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
250	>	public void testTimedPoll() {
251	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
252	>	final SynchronousQueue q = new SynchronousQueue(fair);
253	>	final long startTime = System.nanoTime();
254	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
255	>	catch (InterruptedException e) { threadUnexpectedException(e); }
256		assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
257		}
258
#	Line 272 | Line 260 | public class SynchronousQueueTest extend
260		* timed poll before a delayed offer times out, returning null;
261		* after offer succeeds; on interruption throws
262		*/
263	<	public void testFairTimedPollWithOffer() throws InterruptedException {
264	<	final SynchronousQueue q = new SynchronousQueue(true);
263	>	public void testTimedPollWithOffer() {
264	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
265	>	final SynchronousQueue q = new SynchronousQueue(fair);
266		final CountDownLatch pleaseOffer = new CountDownLatch(1);
267	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
268		Thread t = newStartedThread(new CheckedRunnable() {
269		public void realRun() throws InterruptedException {
270	<	long t0 = System.nanoTime();
271	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
272	<	assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS);
270	>	long startTime = System.nanoTime();
271	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
272	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
273
274		pleaseOffer.countDown();
275	<	t0 = System.nanoTime();
275	>	startTime = System.nanoTime();
276		assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
287	–	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
277
278	<	t0 = System.nanoTime();
278	>	Thread.currentThread().interrupt();
279	>	try {
280	>	q.poll(randomTimeout(), randomTimeUnit());
281	>	shouldThrow();
282	>	} catch (InterruptedException success) {}
283	>	assertFalse(Thread.interrupted());
284	>
285	>	pleaseInterrupt.countDown();
286		try {
287		q.poll(LONG_DELAY_MS, MILLISECONDS);
288		shouldThrow();
289		} catch (InterruptedException success) {}
290	<	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
290	>	assertFalse(Thread.interrupted());
291	>
292	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
293		}});
294
295	<	assertTrue(pleaseOffer.await(MEDIUM_DELAY_MS, MILLISECONDS));
296	<	long t0 = System.nanoTime();
297	<	assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS));
298	<	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
295	>	await(pleaseOffer);
296	>	long startTime = System.nanoTime();
297	>	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
298	>	catch (InterruptedException e) { threadUnexpectedException(e); }
299	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
300
301	+	await(pleaseInterrupt);
302	+	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
303		t.interrupt();
304	<	awaitTermination(t, MEDIUM_DELAY_MS);
304	>	awaitTermination(t);
305		}
306
307		/**
308		* peek() returns null if no active putter
309		*/
310	<	public void testPeek() {
311	<	SynchronousQueue q = new SynchronousQueue();
310	>	public void testPeek()      { testPeek(false); }
311	>	public void testPeek_fair() { testPeek(true); }
312	>	public void testPeek(boolean fair) {
313	>	final SynchronousQueue q = new SynchronousQueue(fair);
314		assertNull(q.peek());
315		}
316
317		/**
318	<	* element() throws NSEE if no active putter
318	>	* element() throws NoSuchElementException if no active putter
319		*/
320	<	public void testElement() {
321	<	SynchronousQueue q = new SynchronousQueue();
320	>	public void testElement()      { testElement(false); }
321	>	public void testElement_fair() { testElement(true); }
322	>	public void testElement(boolean fair) {
323	>	final SynchronousQueue q = new SynchronousQueue(fair);
324		try {
325		q.element();
326		shouldThrow();
#	Line 323 | Line 328 | public class SynchronousQueueTest extend
328		}
329
330		/**
331	<	* remove() throws NSEE if no active putter
331	>	* remove() throws NoSuchElementException if no active putter
332		*/
333	<	public void testRemove() {
334	<	SynchronousQueue q = new SynchronousQueue();
333	>	public void testRemove()      { testRemove(false); }
334	>	public void testRemove_fair() { testRemove(true); }
335	>	public void testRemove(boolean fair) {
336	>	final SynchronousQueue q = new SynchronousQueue(fair);
337		try {
338		q.remove();
339		shouldThrow();
#	Line 334 | Line 341 | public class SynchronousQueueTest extend
341		}
342
343		/**
337	–	* remove(x) returns false
338	–	*/
339	–	public void testRemoveElement() {
340	–	SynchronousQueue q = new SynchronousQueue();
341	–	assertFalse(q.remove(zero));
342	–	assertTrue(q.isEmpty());
343	–	}
344	–
345	–	/**
344		* contains returns false
345		*/
346	<	public void testContains() {
347	<	SynchronousQueue q = new SynchronousQueue();
346	>	public void testContains()      { testContains(false); }
347	>	public void testContains_fair() { testContains(true); }
348	>	public void testContains(boolean fair) {
349	>	final SynchronousQueue q = new SynchronousQueue(fair);
350		assertFalse(q.contains(zero));
351		}
352
353		/**
354		* clear ensures isEmpty
355		*/
356	<	public void testClear() {
357	<	SynchronousQueue q = new SynchronousQueue();
356	>	public void testClear()      { testClear(false); }
357	>	public void testClear_fair() { testClear(true); }
358	>	public void testClear(boolean fair) {
359	>	final SynchronousQueue q = new SynchronousQueue(fair);
360		q.clear();
361		assertTrue(q.isEmpty());
362		}
#	Line 362 | Line 364 | public class SynchronousQueueTest extend
364		/**
365		* containsAll returns false unless empty
366		*/
367	<	public void testContainsAll() {
368	<	SynchronousQueue q = new SynchronousQueue();
367	>	public void testContainsAll()      { testContainsAll(false); }
368	>	public void testContainsAll_fair() { testContainsAll(true); }
369	>	public void testContainsAll(boolean fair) {
370	>	final SynchronousQueue q = new SynchronousQueue(fair);
371		Integer[] empty = new Integer[0];
372		assertTrue(q.containsAll(Arrays.asList(empty)));
373		Integer[] ints = new Integer[1]; ints[0] = zero;
#	Line 373 | Line 377 | public class SynchronousQueueTest extend
377		/**
378		* retainAll returns false
379		*/
380	<	public void testRetainAll() {
381	<	SynchronousQueue q = new SynchronousQueue();
380	>	public void testRetainAll()      { testRetainAll(false); }
381	>	public void testRetainAll_fair() { testRetainAll(true); }
382	>	public void testRetainAll(boolean fair) {
383	>	final SynchronousQueue q = new SynchronousQueue(fair);
384		Integer[] empty = new Integer[0];
385		assertFalse(q.retainAll(Arrays.asList(empty)));
386		Integer[] ints = new Integer[1]; ints[0] = zero;
#	Line 384 | Line 390 | public class SynchronousQueueTest extend
390		/**
391		* removeAll returns false
392		*/
393	<	public void testRemoveAll() {
394	<	SynchronousQueue q = new SynchronousQueue();
393	>	public void testRemoveAll()      { testRemoveAll(false); }
394	>	public void testRemoveAll_fair() { testRemoveAll(true); }
395	>	public void testRemoveAll(boolean fair) {
396	>	final SynchronousQueue q = new SynchronousQueue(fair);
397		Integer[] empty = new Integer[0];
398		assertFalse(q.removeAll(Arrays.asList(empty)));
399		Integer[] ints = new Integer[1]; ints[0] = zero;
#	Line 395 | Line 403 | public class SynchronousQueueTest extend
403		/**
404		* toArray is empty
405		*/
406	<	public void testToArray() {
407	<	SynchronousQueue q = new SynchronousQueue();
406	>	public void testToArray()      { testToArray(false); }
407	>	public void testToArray_fair() { testToArray(true); }
408	>	public void testToArray(boolean fair) {
409	>	final SynchronousQueue q = new SynchronousQueue(fair);
410		Object[] o = q.toArray();
411	<	assertEquals(o.length, 0);
411	>	assertEquals(0, o.length);
412		}
413
414		/**
415	<	* toArray(a) is nulled at position 0
415	>	* toArray(Integer array) returns its argument with the first
416	>	* element (if present) nulled out
417		*/
418	<	public void testToArray2() {
419	<	SynchronousQueue q = new SynchronousQueue();
420	<	Integer[] ints = new Integer[1];
421	<	assertNull(ints[0]);
418	>	public void testToArray2()      { testToArray2(false); }
419	>	public void testToArray2_fair() { testToArray2(true); }
420	>	public void testToArray2(boolean fair) {
421	>	final SynchronousQueue<Integer> q = new SynchronousQueue<>(fair);
422	>	Integer[] a;
423	>
424	>	a = new Integer[0];
425	>	assertSame(a, q.toArray(a));
426	>
427	>	a = new Integer[3];
428	>	Arrays.fill(a, 42);
429	>	assertSame(a, q.toArray(a));
430	>	assertNull(a[0]);
431	>	for (int i = 1; i < a.length; i++)
432	>	assertEquals(42, (int) a[i]);
433		}
434
435		/**
436		* toArray(null) throws NPE
437		*/
438	<	public void testToArray_BadArg() {
439	<	SynchronousQueue q = new SynchronousQueue();
438	>	public void testToArray_null()      { testToArray_null(false); }
439	>	public void testToArray_null_fair() { testToArray_null(true); }
440	>	public void testToArray_null(boolean fair) {
441	>	final SynchronousQueue q = new SynchronousQueue(fair);
442		try {
443	<	Object o[] = q.toArray(null);
443	>	Object[] o = q.toArray((Object[])null);
444		shouldThrow();
445		} catch (NullPointerException success) {}
446		}
#	Line 424 | Line 448 | public class SynchronousQueueTest extend
448		/**
449		* iterator does not traverse any elements
450		*/
451	<	public void testIterator() {
452	<	SynchronousQueue q = new SynchronousQueue();
453	<	Iterator it = q.iterator();
454	<	assertFalse(it.hasNext());
431	<	try {
432	<	Object x = it.next();
433	<	shouldThrow();
434	<	} catch (NoSuchElementException success) {}
451	>	public void testIterator()      { testIterator(false); }
452	>	public void testIterator_fair() { testIterator(true); }
453	>	public void testIterator(boolean fair) {
454	>	assertIteratorExhausted(new SynchronousQueue(fair).iterator());
455		}
456
457		/**
458	<	* iterator remove throws ISE
458	>	* iterator remove throws IllegalStateException
459		*/
460	<	public void testIteratorRemove() {
461	<	SynchronousQueue q = new SynchronousQueue();
460	>	public void testIteratorRemove()      { testIteratorRemove(false); }
461	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
462	>	public void testIteratorRemove(boolean fair) {
463	>	final SynchronousQueue q = new SynchronousQueue(fair);
464		Iterator it = q.iterator();
465		try {
466		it.remove();
#	Line 449 | Line 471 | public class SynchronousQueueTest extend
471		/**
472		* toString returns a non-null string
473		*/
474	<	public void testToString() {
475	<	SynchronousQueue q = new SynchronousQueue();
474	>	public void testToString()      { testToString(false); }
475	>	public void testToString_fair() { testToString(true); }
476	>	public void testToString(boolean fair) {
477	>	final SynchronousQueue q = new SynchronousQueue(fair);
478		String s = q.toString();
479		assertNotNull(s);
480		}
#	Line 458 | Line 482 | public class SynchronousQueueTest extend
482		/**
483		* offer transfers elements across Executor tasks
484		*/
485	<	public void testOfferInExecutor() {
486	<	final SynchronousQueue q = new SynchronousQueue();
487	<	ExecutorService executor = Executors.newFixedThreadPool(2);
485	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
486	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
487	>	public void testOfferInExecutor(boolean fair) {
488	>	final SynchronousQueue q = new SynchronousQueue(fair);
489		final CheckedBarrier threadsStarted = new CheckedBarrier(2);
490	+	final ExecutorService executor = Executors.newFixedThreadPool(2);
491	+	try (PoolCleaner cleaner = cleaner(executor)) {
492
493	<	executor.execute(new CheckedRunnable() {
494	<	public void realRun() throws InterruptedException {
495	<	assertFalse(q.offer(one));
496	<	threadsStarted.await();
497	<	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
498	<	assertEquals(0, q.remainingCapacity());
499	<	}});
500	<
501	<	executor.execute(new CheckedRunnable() {
502	<	public void realRun() throws InterruptedException {
503	<	threadsStarted.await();
504	<	assertSame(one, q.take());
505	<	}});
506	<
480	<	joinPool(executor);
493	>	executor.execute(new CheckedRunnable() {
494	>	public void realRun() throws InterruptedException {
495	>	assertFalse(q.offer(one));
496	>	threadsStarted.await();
497	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
498	>	assertEquals(0, q.remainingCapacity());
499	>	}});
500	>
501	>	executor.execute(new CheckedRunnable() {
502	>	public void realRun() throws InterruptedException {
503	>	threadsStarted.await();
504	>	assertSame(one, q.take());
505	>	}});
506	>	}
507		}
508
509		/**
510		* timed poll retrieves elements across Executor threads
511		*/
512	<	public void testPollInExecutor() {
513	<	final SynchronousQueue q = new SynchronousQueue();
512	>	public void testPollInExecutor()      { testPollInExecutor(false); }
513	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
514	>	public void testPollInExecutor(boolean fair) {
515	>	final SynchronousQueue q = new SynchronousQueue(fair);
516		final CheckedBarrier threadsStarted = new CheckedBarrier(2);
517	<	ExecutorService executor = Executors.newFixedThreadPool(2);
518	<	executor.execute(new CheckedRunnable() {
519	<	public void realRun() throws InterruptedException {
520	<	assertNull(q.poll());
521	<	threadsStarted.await();
522	<	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
523	<	assertTrue(q.isEmpty());
524	<	}});
525	<
526	<	executor.execute(new CheckedRunnable() {
527	<	public void realRun() throws InterruptedException {
528	<	threadsStarted.await();
529	<	q.put(one);
530	<	}});
531	<
532	<	joinPool(executor);
505	<	}
506	<
507	<	/**
508	<	* a deserialized serialized queue is usable
509	<	*/
510	<	public void testSerialization() throws Exception {
511	<	SynchronousQueue q = new SynchronousQueue();
512	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
513	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
514	<	out.writeObject(q);
515	<	out.close();
516	<
517	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
518	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
519	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
520	<	assertEquals(q.size(), r.size());
521	<	while (!q.isEmpty())
522	<	assertEquals(q.remove(), r.remove());
523	<	}
524	<
525	<	/**
526	<	* drainTo(null) throws NPE
527	<	*/
528	<	public void testDrainToNull() {
529	<	SynchronousQueue q = new SynchronousQueue();
530	<	try {
531	<	q.drainTo(null);
532	<	shouldThrow();
533	<	} catch (NullPointerException success) {}
517	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
518	>	try (PoolCleaner cleaner = cleaner(executor)) {
519	>	executor.execute(new CheckedRunnable() {
520	>	public void realRun() throws InterruptedException {
521	>	assertNull(q.poll());
522	>	threadsStarted.await();
523	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
524	>	assertTrue(q.isEmpty());
525	>	}});
526	>
527	>	executor.execute(new CheckedRunnable() {
528	>	public void realRun() throws InterruptedException {
529	>	threadsStarted.await();
530	>	q.put(one);
531	>	}});
532	>	}
533		}
534
535		/**
536	<	* drainTo(this) throws IAE
536	>	* a deserialized/reserialized queue is usable
537		*/
538	<	public void testDrainToSelf() {
539	<	SynchronousQueue q = new SynchronousQueue();
540	<	try {
541	<	q.drainTo(q);
542	<	shouldThrow();
543	<	} catch (IllegalArgumentException success) {}
538	>	public void testSerialization() {
539	>	final SynchronousQueue x = new SynchronousQueue();
540	>	final SynchronousQueue y = new SynchronousQueue(false);
541	>	final SynchronousQueue z = new SynchronousQueue(true);
542	>	assertSerialEquals(x, y);
543	>	assertNotSerialEquals(x, z);
544	>	SynchronousQueue[] qs = { x, y, z };
545	>	for (SynchronousQueue q : qs) {
546	>	SynchronousQueue clone = serialClone(q);
547	>	assertNotSame(q, clone);
548	>	assertSerialEquals(q, clone);
549	>	assertTrue(clone.isEmpty());
550	>	assertEquals(0, clone.size());
551	>	assertEquals(0, clone.remainingCapacity());
552	>	assertFalse(clone.offer(zero));
553	>	}
554		}
555
556		/**
557		* drainTo(c) of empty queue doesn't transfer elements
558		*/
559	<	public void testDrainTo() {
560	<	SynchronousQueue q = new SynchronousQueue();
559	>	public void testDrainTo()      { testDrainTo(false); }
560	>	public void testDrainTo_fair() { testDrainTo(true); }
561	>	public void testDrainTo(boolean fair) {
562	>	final SynchronousQueue q = new SynchronousQueue(fair);
563		ArrayList l = new ArrayList();
564		q.drainTo(l);
565	<	assertEquals(q.size(), 0);
566	<	assertEquals(l.size(), 0);
565	>	assertEquals(0, q.size());
566	>	assertEquals(0, l.size());
567		}
568
569		/**
570		* drainTo empties queue, unblocking a waiting put.
571		*/
572	<	public void testDrainToWithActivePut() throws InterruptedException {
573	<	final SynchronousQueue q = new SynchronousQueue();
572	>	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
573	>	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
574	>	public void testDrainToWithActivePut(boolean fair) {
575	>	final SynchronousQueue q = new SynchronousQueue(fair);
576		Thread t = newStartedThread(new CheckedRunnable() {
577		public void realRun() throws InterruptedException {
578		q.put(one);
#	Line 573 | Line 586 | public class SynchronousQueueTest extend
586		fail("timed out");
587		Thread.yield();
588		}
589	<	assertTrue(l.size() == 1);
589	>	assertEquals(1, l.size());
590		assertSame(one, l.get(0));
591		awaitTermination(t);
592		}
593
594		/**
582	–	* drainTo(null, n) throws NPE
583	–	*/
584	–	public void testDrainToNullN() {
585	–	SynchronousQueue q = new SynchronousQueue();
586	–	try {
587	–	q.drainTo(null, 0);
588	–	shouldThrow();
589	–	} catch (NullPointerException success) {}
590	–	}
591	–
592	–	/**
593	–	* drainTo(this, n) throws IAE
594	–	*/
595	–	public void testDrainToSelfN() {
596	–	SynchronousQueue q = new SynchronousQueue();
597	–	try {
598	–	q.drainTo(q, 0);
599	–	shouldThrow();
600	–	} catch (IllegalArgumentException success) {}
601	–	}
602	–
603	–	/**
595		* drainTo(c, n) empties up to n elements of queue into c
596		*/
597		public void testDrainToN() throws InterruptedException {
#	Line 616 | Line 607 | public class SynchronousQueueTest extend
607		}});
608
609		ArrayList l = new ArrayList();
610	<	delay(SHORT_DELAY_MS);
611	<	q.drainTo(l, 1);
610	>	int drained;
611	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
612	>	assertEquals(1, drained);
613		assertEquals(1, l.size());
614	<	q.drainTo(l, 1);
614	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
615	>	assertEquals(1, drained);
616		assertEquals(2, l.size());
617		assertTrue(l.contains(one));
618		assertTrue(l.contains(two));
#	Line 627 | Line 620 | public class SynchronousQueueTest extend
620		awaitTermination(t2);
621		}
622
623	+	/**
624	+	* remove(null), contains(null) always return false
625	+	*/
626	+	public void testNeverContainsNull() {
627	+	Collection<?> q = new SynchronousQueue();
628	+	assertFalse(q.contains(null));
629	+	assertFalse(q.remove(null));
630	+	}
631	+
632		}

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