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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 1.61 by jsr166, Fri Aug 4 03:30:21 2017 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	>	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	>	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() {
#	Line 229 | Line 198 | public class SynchronousQueueTest extend
198		long startTime = System.nanoTime();
199		assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
200		assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
201	+
202	+	Thread.currentThread().interrupt();
203	+	try {
204	+	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
205	+	shouldThrow();
206	+	} catch (InterruptedException success) {}
207	+	assertFalse(Thread.interrupted());
208	+
209		pleaseInterrupt.countDown();
210		try {
211		q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
212		shouldThrow();
213		} catch (InterruptedException success) {}
214	+	assertFalse(Thread.interrupted());
215		}});
216
217		await(pleaseInterrupt);
218	<	assertThreadStaysAlive(t);
218	>	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
219		t.interrupt();
220		awaitTermination(t);
221		}
#	Line 245 | Line 223 | public class SynchronousQueueTest extend
223		/**
224		* poll return null if no active putter
225		*/
226	<	public void testPoll() {
227	<	SynchronousQueue q = new SynchronousQueue();
226	>	public void testPoll()      { testPoll(false); }
227	>	public void testPoll_fair() { testPoll(true); }
228	>	public void testPoll(boolean fair) {
229	>	final SynchronousQueue q = new SynchronousQueue(fair);
230		assertNull(q.poll());
231		}
232
233		/**
234		* timed poll with zero timeout times out if no active putter
235		*/
236	<	public void testTimedPoll0() throws InterruptedException {
237	<	SynchronousQueue q = new SynchronousQueue();
238	<	assertNull(q.poll(0, MILLISECONDS));
236	>	public void testTimedPoll0()      { testTimedPoll0(false); }
237	>	public void testTimedPoll0_fair() { testTimedPoll0(true); }
238	>	public void testTimedPoll0(boolean fair) {
239	>	final SynchronousQueue q = new SynchronousQueue(fair);
240	>	try { assertNull(q.poll(0, MILLISECONDS)); }
241	>	catch (InterruptedException e) { threadUnexpectedException(e); }
242		}
243
244		/**
245		* timed poll with nonzero timeout times out if no active putter
246		*/
247	<	public void testTimedPoll() throws InterruptedException {
248	<	SynchronousQueue q = new SynchronousQueue();
249	<	long startTime = System.nanoTime();
250	<	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
247	>	public void testTimedPoll() {
248	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
249	>	final SynchronousQueue q = new SynchronousQueue(fair);
250	>	final long startTime = System.nanoTime();
251	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
252	>	catch (InterruptedException e) { threadUnexpectedException(e); }
253		assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
254		}
255
#	Line 272 | Line 257 | public class SynchronousQueueTest extend
257		* timed poll before a delayed offer times out, returning null;
258		* after offer succeeds; on interruption throws
259		*/
260	<	public void testFairTimedPollWithOffer() throws InterruptedException {
261	<	final SynchronousQueue q = new SynchronousQueue(true);
260	>	public void testTimedPollWithOffer() {
261	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
262	>	final SynchronousQueue q = new SynchronousQueue(fair);
263		final CountDownLatch pleaseOffer = new CountDownLatch(1);
264	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
265		Thread t = newStartedThread(new CheckedRunnable() {
266		public void realRun() throws InterruptedException {
267	<	long t0 = System.nanoTime();
268	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
269	<	assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS);
267	>	long startTime = System.nanoTime();
268	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
269	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
270
271		pleaseOffer.countDown();
272	<	t0 = System.nanoTime();
272	>	startTime = System.nanoTime();
273		assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
287	–	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
274
275	<	t0 = System.nanoTime();
275	>	Thread.currentThread().interrupt();
276	>	try {
277	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
278	>	shouldThrow();
279	>	} catch (InterruptedException success) {}
280	>	assertFalse(Thread.interrupted());
281	>
282	>	pleaseInterrupt.countDown();
283		try {
284		q.poll(LONG_DELAY_MS, MILLISECONDS);
285		shouldThrow();
286		} catch (InterruptedException success) {}
287	<	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
287	>	assertFalse(Thread.interrupted());
288	>
289	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
290		}});
291
292	<	assertTrue(pleaseOffer.await(MEDIUM_DELAY_MS, MILLISECONDS));
293	<	long t0 = System.nanoTime();
294	<	assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS));
295	<	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
292	>	await(pleaseOffer);
293	>	long startTime = System.nanoTime();
294	>	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
295	>	catch (InterruptedException e) { threadUnexpectedException(e); }
296	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
297
298	+	await(pleaseInterrupt);
299	+	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
300		t.interrupt();
301	<	awaitTermination(t, MEDIUM_DELAY_MS);
301	>	awaitTermination(t);
302		}
303
304		/**
305		* peek() returns null if no active putter
306		*/
307	<	public void testPeek() {
308	<	SynchronousQueue q = new SynchronousQueue();
307	>	public void testPeek()      { testPeek(false); }
308	>	public void testPeek_fair() { testPeek(true); }
309	>	public void testPeek(boolean fair) {
310	>	final SynchronousQueue q = new SynchronousQueue(fair);
311		assertNull(q.peek());
312		}
313
314		/**
315	<	* element() throws NSEE if no active putter
315	>	* element() throws NoSuchElementException if no active putter
316		*/
317	<	public void testElement() {
318	<	SynchronousQueue q = new SynchronousQueue();
317	>	public void testElement()      { testElement(false); }
318	>	public void testElement_fair() { testElement(true); }
319	>	public void testElement(boolean fair) {
320	>	final SynchronousQueue q = new SynchronousQueue(fair);
321		try {
322		q.element();
323		shouldThrow();
#	Line 323 | Line 325 | public class SynchronousQueueTest extend
325		}
326
327		/**
328	<	* remove() throws NSEE if no active putter
328	>	* remove() throws NoSuchElementException if no active putter
329		*/
330	<	public void testRemove() {
331	<	SynchronousQueue q = new SynchronousQueue();
330	>	public void testRemove()      { testRemove(false); }
331	>	public void testRemove_fair() { testRemove(true); }
332	>	public void testRemove(boolean fair) {
333	>	final SynchronousQueue q = new SynchronousQueue(fair);
334		try {
335		q.remove();
336		shouldThrow();
#	Line 334 | Line 338 | public class SynchronousQueueTest extend
338		}
339
340		/**
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	–	/**
341		* contains returns false
342		*/
343	<	public void testContains() {
344	<	SynchronousQueue q = new SynchronousQueue();
343	>	public void testContains()      { testContains(false); }
344	>	public void testContains_fair() { testContains(true); }
345	>	public void testContains(boolean fair) {
346	>	final SynchronousQueue q = new SynchronousQueue(fair);
347		assertFalse(q.contains(zero));
348		}
349
350		/**
351		* clear ensures isEmpty
352		*/
353	<	public void testClear() {
354	<	SynchronousQueue q = new SynchronousQueue();
353	>	public void testClear()      { testClear(false); }
354	>	public void testClear_fair() { testClear(true); }
355	>	public void testClear(boolean fair) {
356	>	final SynchronousQueue q = new SynchronousQueue(fair);
357		q.clear();
358		assertTrue(q.isEmpty());
359		}
#	Line 362 | Line 361 | public class SynchronousQueueTest extend
361		/**
362		* containsAll returns false unless empty
363		*/
364	<	public void testContainsAll() {
365	<	SynchronousQueue q = new SynchronousQueue();
364	>	public void testContainsAll()      { testContainsAll(false); }
365	>	public void testContainsAll_fair() { testContainsAll(true); }
366	>	public void testContainsAll(boolean fair) {
367	>	final SynchronousQueue q = new SynchronousQueue(fair);
368		Integer[] empty = new Integer[0];
369		assertTrue(q.containsAll(Arrays.asList(empty)));
370		Integer[] ints = new Integer[1]; ints[0] = zero;
#	Line 373 | Line 374 | public class SynchronousQueueTest extend
374		/**
375		* retainAll returns false
376		*/
377	<	public void testRetainAll() {
378	<	SynchronousQueue q = new SynchronousQueue();
377	>	public void testRetainAll()      { testRetainAll(false); }
378	>	public void testRetainAll_fair() { testRetainAll(true); }
379	>	public void testRetainAll(boolean fair) {
380	>	final SynchronousQueue q = new SynchronousQueue(fair);
381		Integer[] empty = new Integer[0];
382		assertFalse(q.retainAll(Arrays.asList(empty)));
383		Integer[] ints = new Integer[1]; ints[0] = zero;
#	Line 384 | Line 387 | public class SynchronousQueueTest extend
387		/**
388		* removeAll returns false
389		*/
390	<	public void testRemoveAll() {
391	<	SynchronousQueue q = new SynchronousQueue();
390	>	public void testRemoveAll()      { testRemoveAll(false); }
391	>	public void testRemoveAll_fair() { testRemoveAll(true); }
392	>	public void testRemoveAll(boolean fair) {
393	>	final SynchronousQueue q = new SynchronousQueue(fair);
394		Integer[] empty = new Integer[0];
395		assertFalse(q.removeAll(Arrays.asList(empty)));
396		Integer[] ints = new Integer[1]; ints[0] = zero;
#	Line 395 | Line 400 | public class SynchronousQueueTest extend
400		/**
401		* toArray is empty
402		*/
403	<	public void testToArray() {
404	<	SynchronousQueue q = new SynchronousQueue();
403	>	public void testToArray()      { testToArray(false); }
404	>	public void testToArray_fair() { testToArray(true); }
405	>	public void testToArray(boolean fair) {
406	>	final SynchronousQueue q = new SynchronousQueue(fair);
407		Object[] o = q.toArray();
408	<	assertEquals(o.length, 0);
408	>	assertEquals(0, o.length);
409		}
410
411		/**
412	<	* toArray(a) is nulled at position 0
412	>	* toArray(Integer array) returns its argument with the first
413	>	* element (if present) nulled out
414		*/
415	<	public void testToArray2() {
416	<	SynchronousQueue q = new SynchronousQueue();
417	<	Integer[] ints = new Integer[1];
418	<	assertNull(ints[0]);
415	>	public void testToArray2()      { testToArray2(false); }
416	>	public void testToArray2_fair() { testToArray2(true); }
417	>	public void testToArray2(boolean fair) {
418	>	final SynchronousQueue<Integer> q = new SynchronousQueue<>(fair);
419	>	Integer[] a;
420	>
421	>	a = new Integer[0];
422	>	assertSame(a, q.toArray(a));
423	>
424	>	a = new Integer[3];
425	>	Arrays.fill(a, 42);
426	>	assertSame(a, q.toArray(a));
427	>	assertNull(a[0]);
428	>	for (int i = 1; i < a.length; i++)
429	>	assertEquals(42, (int) a[i]);
430		}
431
432		/**
433		* toArray(null) throws NPE
434		*/
435	<	public void testToArray_BadArg() {
436	<	SynchronousQueue q = new SynchronousQueue();
435	>	public void testToArray_null()      { testToArray_null(false); }
436	>	public void testToArray_null_fair() { testToArray_null(true); }
437	>	public void testToArray_null(boolean fair) {
438	>	final SynchronousQueue q = new SynchronousQueue(fair);
439		try {
440	<	Object o[] = q.toArray(null);
440	>	Object[] o = q.toArray(null);
441		shouldThrow();
442		} catch (NullPointerException success) {}
443		}
#	Line 424 | Line 445 | public class SynchronousQueueTest extend
445		/**
446		* iterator does not traverse any elements
447		*/
448	<	public void testIterator() {
449	<	SynchronousQueue q = new SynchronousQueue();
450	<	Iterator it = q.iterator();
451	<	assertFalse(it.hasNext());
431	<	try {
432	<	Object x = it.next();
433	<	shouldThrow();
434	<	} catch (NoSuchElementException success) {}
448	>	public void testIterator()      { testIterator(false); }
449	>	public void testIterator_fair() { testIterator(true); }
450	>	public void testIterator(boolean fair) {
451	>	assertIteratorExhausted(new SynchronousQueue(fair).iterator());
452		}
453
454		/**
455	<	* iterator remove throws ISE
455	>	* iterator remove throws IllegalStateException
456		*/
457	<	public void testIteratorRemove() {
458	<	SynchronousQueue q = new SynchronousQueue();
457	>	public void testIteratorRemove()      { testIteratorRemove(false); }
458	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
459	>	public void testIteratorRemove(boolean fair) {
460	>	final SynchronousQueue q = new SynchronousQueue(fair);
461		Iterator it = q.iterator();
462		try {
463		it.remove();
#	Line 449 | Line 468 | public class SynchronousQueueTest extend
468		/**
469		* toString returns a non-null string
470		*/
471	<	public void testToString() {
472	<	SynchronousQueue q = new SynchronousQueue();
471	>	public void testToString()      { testToString(false); }
472	>	public void testToString_fair() { testToString(true); }
473	>	public void testToString(boolean fair) {
474	>	final SynchronousQueue q = new SynchronousQueue(fair);
475		String s = q.toString();
476		assertNotNull(s);
477		}
#	Line 458 | Line 479 | public class SynchronousQueueTest extend
479		/**
480		* offer transfers elements across Executor tasks
481		*/
482	<	public void testOfferInExecutor() {
483	<	final SynchronousQueue q = new SynchronousQueue();
484	<	ExecutorService executor = Executors.newFixedThreadPool(2);
482	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
483	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
484	>	public void testOfferInExecutor(boolean fair) {
485	>	final SynchronousQueue q = new SynchronousQueue(fair);
486		final CheckedBarrier threadsStarted = new CheckedBarrier(2);
487	+	final ExecutorService executor = Executors.newFixedThreadPool(2);
488	+	try (PoolCleaner cleaner = cleaner(executor)) {
489
490	<	executor.execute(new CheckedRunnable() {
491	<	public void realRun() throws InterruptedException {
492	<	assertFalse(q.offer(one));
493	<	threadsStarted.await();
494	<	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
495	<	assertEquals(0, q.remainingCapacity());
496	<	}});
497	<
498	<	executor.execute(new CheckedRunnable() {
499	<	public void realRun() throws InterruptedException {
500	<	threadsStarted.await();
501	<	assertSame(one, q.take());
502	<	}});
503	<
480	<	joinPool(executor);
490	>	executor.execute(new CheckedRunnable() {
491	>	public void realRun() throws InterruptedException {
492	>	assertFalse(q.offer(one));
493	>	threadsStarted.await();
494	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
495	>	assertEquals(0, q.remainingCapacity());
496	>	}});
497	>
498	>	executor.execute(new CheckedRunnable() {
499	>	public void realRun() throws InterruptedException {
500	>	threadsStarted.await();
501	>	assertSame(one, q.take());
502	>	}});
503	>	}
504		}
505
506		/**
507		* timed poll retrieves elements across Executor threads
508		*/
509	<	public void testPollInExecutor() {
510	<	final SynchronousQueue q = new SynchronousQueue();
509	>	public void testPollInExecutor()      { testPollInExecutor(false); }
510	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
511	>	public void testPollInExecutor(boolean fair) {
512	>	final SynchronousQueue q = new SynchronousQueue(fair);
513		final CheckedBarrier threadsStarted = new CheckedBarrier(2);
514	<	ExecutorService executor = Executors.newFixedThreadPool(2);
515	<	executor.execute(new CheckedRunnable() {
516	<	public void realRun() throws InterruptedException {
517	<	assertNull(q.poll());
518	<	threadsStarted.await();
519	<	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
520	<	assertTrue(q.isEmpty());
521	<	}});
522	<
523	<	executor.execute(new CheckedRunnable() {
524	<	public void realRun() throws InterruptedException {
525	<	threadsStarted.await();
526	<	q.put(one);
527	<	}});
528	<
529	<	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) {}
514	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
515	>	try (PoolCleaner cleaner = cleaner(executor)) {
516	>	executor.execute(new CheckedRunnable() {
517	>	public void realRun() throws InterruptedException {
518	>	assertNull(q.poll());
519	>	threadsStarted.await();
520	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
521	>	assertTrue(q.isEmpty());
522	>	}});
523	>
524	>	executor.execute(new CheckedRunnable() {
525	>	public void realRun() throws InterruptedException {
526	>	threadsStarted.await();
527	>	q.put(one);
528	>	}});
529	>	}
530		}
531
532		/**
533	<	* drainTo(this) throws IAE
533	>	* a deserialized/reserialized queue is usable
534		*/
535	<	public void testDrainToSelf() {
536	<	SynchronousQueue q = new SynchronousQueue();
537	<	try {
538	<	q.drainTo(q);
539	<	shouldThrow();
540	<	} catch (IllegalArgumentException success) {}
535	>	public void testSerialization() {
536	>	final SynchronousQueue x = new SynchronousQueue();
537	>	final SynchronousQueue y = new SynchronousQueue(false);
538	>	final SynchronousQueue z = new SynchronousQueue(true);
539	>	assertSerialEquals(x, y);
540	>	assertNotSerialEquals(x, z);
541	>	SynchronousQueue[] qs = { x, y, z };
542	>	for (SynchronousQueue q : qs) {
543	>	SynchronousQueue clone = serialClone(q);
544	>	assertNotSame(q, clone);
545	>	assertSerialEquals(q, clone);
546	>	assertTrue(clone.isEmpty());
547	>	assertEquals(0, clone.size());
548	>	assertEquals(0, clone.remainingCapacity());
549	>	assertFalse(clone.offer(zero));
550	>	}
551		}
552
553		/**
554		* drainTo(c) of empty queue doesn't transfer elements
555		*/
556	<	public void testDrainTo() {
557	<	SynchronousQueue q = new SynchronousQueue();
556	>	public void testDrainTo()      { testDrainTo(false); }
557	>	public void testDrainTo_fair() { testDrainTo(true); }
558	>	public void testDrainTo(boolean fair) {
559	>	final SynchronousQueue q = new SynchronousQueue(fair);
560		ArrayList l = new ArrayList();
561		q.drainTo(l);
562	<	assertEquals(q.size(), 0);
563	<	assertEquals(l.size(), 0);
562	>	assertEquals(0, q.size());
563	>	assertEquals(0, l.size());
564		}
565
566		/**
567		* drainTo empties queue, unblocking a waiting put.
568		*/
569	<	public void testDrainToWithActivePut() throws InterruptedException {
570	<	final SynchronousQueue q = new SynchronousQueue();
569	>	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
570	>	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
571	>	public void testDrainToWithActivePut(boolean fair) {
572	>	final SynchronousQueue q = new SynchronousQueue(fair);
573		Thread t = newStartedThread(new CheckedRunnable() {
574		public void realRun() throws InterruptedException {
575		q.put(one);
#	Line 573 | Line 583 | public class SynchronousQueueTest extend
583		fail("timed out");
584		Thread.yield();
585		}
586	<	assertTrue(l.size() == 1);
586	>	assertEquals(1, l.size());
587		assertSame(one, l.get(0));
588		awaitTermination(t);
589		}
590
591		/**
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	–	/**
592		* drainTo(c, n) empties up to n elements of queue into c
593		*/
594		public void testDrainToN() throws InterruptedException {
#	Line 616 | Line 604 | public class SynchronousQueueTest extend
604		}});
605
606		ArrayList l = new ArrayList();
607	<	delay(SHORT_DELAY_MS);
608	<	q.drainTo(l, 1);
607	>	int drained;
608	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
609	>	assertEquals(1, drained);
610		assertEquals(1, l.size());
611	<	q.drainTo(l, 1);
611	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
612	>	assertEquals(1, drained);
613		assertEquals(2, l.size());
614		assertTrue(l.contains(one));
615		assertTrue(l.contains(two));
#	Line 627 | Line 617 | public class SynchronousQueueTest extend
617		awaitTermination(t2);
618		}
619
620	+	/**
621	+	* remove(null), contains(null) always return false
622	+	*/
623	+	public void testNeverContainsNull() {
624	+	Collection<?> q = new SynchronousQueue();
625	+	assertFalse(q.contains(null));
626	+	assertFalse(q.remove(null));
627	+	}
628	+
629		}

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