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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 1.58 by jsr166, Sun May 14 04:02:06 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		/**
117	–	* 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	–	/**
100		* addAll throws ISE 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 234 | Line 203 | public class SynchronousQueueTest extend
203		q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
204		shouldThrow();
205		} catch (InterruptedException success) {}
206	+	assertFalse(Thread.interrupted());
207		}});
208
209		await(pleaseInterrupt);
210	<	assertThreadStaysAlive(t);
210	>	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
211		t.interrupt();
212		awaitTermination(t);
213		}
#	Line 245 | Line 215 | public class SynchronousQueueTest extend
215		/**
216		* poll return null if no active putter
217		*/
218	<	public void testPoll() {
219	<	SynchronousQueue q = new SynchronousQueue();
218	>	public void testPoll()      { testPoll(false); }
219	>	public void testPoll_fair() { testPoll(true); }
220	>	public void testPoll(boolean fair) {
221	>	final SynchronousQueue q = new SynchronousQueue(fair);
222		assertNull(q.poll());
223		}
224
225		/**
226		* timed poll with zero timeout times out if no active putter
227		*/
228	<	public void testTimedPoll0() throws InterruptedException {
229	<	SynchronousQueue q = new SynchronousQueue();
230	<	assertNull(q.poll(0, MILLISECONDS));
228	>	public void testTimedPoll0()      { testTimedPoll0(false); }
229	>	public void testTimedPoll0_fair() { testTimedPoll0(true); }
230	>	public void testTimedPoll0(boolean fair) {
231	>	final SynchronousQueue q = new SynchronousQueue(fair);
232	>	try { assertNull(q.poll(0, MILLISECONDS)); }
233	>	catch (InterruptedException e) { threadUnexpectedException(e); }
234		}
235
236		/**
237		* timed poll with nonzero timeout times out if no active putter
238		*/
239	<	public void testTimedPoll() throws InterruptedException {
240	<	SynchronousQueue q = new SynchronousQueue();
241	<	long startTime = System.nanoTime();
242	<	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
239	>	public void testTimedPoll() {
240	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
241	>	final SynchronousQueue q = new SynchronousQueue(fair);
242	>	final long startTime = System.nanoTime();
243	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
244	>	catch (InterruptedException e) { threadUnexpectedException(e); }
245		assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
246		}
247
#	Line 272 | Line 249 | public class SynchronousQueueTest extend
249		* timed poll before a delayed offer times out, returning null;
250		* after offer succeeds; on interruption throws
251		*/
252	<	public void testFairTimedPollWithOffer() throws InterruptedException {
253	<	final SynchronousQueue q = new SynchronousQueue(true);
252	>	public void testTimedPollWithOffer() {
253	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
254	>	final SynchronousQueue q = new SynchronousQueue(fair);
255		final CountDownLatch pleaseOffer = new CountDownLatch(1);
256	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
257		Thread t = newStartedThread(new CheckedRunnable() {
258		public void realRun() throws InterruptedException {
259	<	long t0 = System.nanoTime();
260	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
261	<	assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS);
259	>	long startTime = System.nanoTime();
260	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
261	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
262
263		pleaseOffer.countDown();
264	<	t0 = System.nanoTime();
264	>	startTime = System.nanoTime();
265		assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
287	–	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
266
267	<	t0 = System.nanoTime();
267	>	Thread.currentThread().interrupt();
268	>	try {
269	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
270	>	shouldThrow();
271	>	} catch (InterruptedException success) {}
272	>	assertFalse(Thread.interrupted());
273	>
274	>	pleaseInterrupt.countDown();
275		try {
276		q.poll(LONG_DELAY_MS, MILLISECONDS);
277		shouldThrow();
278		} catch (InterruptedException success) {}
279	<	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
279	>	assertFalse(Thread.interrupted());
280	>
281	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
282		}});
283
284	<	assertTrue(pleaseOffer.await(MEDIUM_DELAY_MS, MILLISECONDS));
285	<	long t0 = System.nanoTime();
286	<	assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS));
287	<	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
284	>	await(pleaseOffer);
285	>	long startTime = System.nanoTime();
286	>	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
287	>	catch (InterruptedException e) { threadUnexpectedException(e); }
288	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
289
290	+	await(pleaseInterrupt);
291	+	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
292		t.interrupt();
293	<	awaitTermination(t, MEDIUM_DELAY_MS);
293	>	awaitTermination(t);
294		}
295
296		/**
297		* peek() returns null if no active putter
298		*/
299	<	public void testPeek() {
300	<	SynchronousQueue q = new SynchronousQueue();
299	>	public void testPeek()      { testPeek(false); }
300	>	public void testPeek_fair() { testPeek(true); }
301	>	public void testPeek(boolean fair) {
302	>	final SynchronousQueue q = new SynchronousQueue(fair);
303		assertNull(q.peek());
304		}
305
306		/**
307	<	* element() throws NSEE if no active putter
307	>	* element() throws NoSuchElementException if no active putter
308		*/
309	<	public void testElement() {
310	<	SynchronousQueue q = new SynchronousQueue();
309	>	public void testElement()      { testElement(false); }
310	>	public void testElement_fair() { testElement(true); }
311	>	public void testElement(boolean fair) {
312	>	final SynchronousQueue q = new SynchronousQueue(fair);
313		try {
314		q.element();
315		shouldThrow();
#	Line 323 | Line 317 | public class SynchronousQueueTest extend
317		}
318
319		/**
320	<	* remove() throws NSEE if no active putter
320	>	* remove() throws NoSuchElementException if no active putter
321		*/
322	<	public void testRemove() {
323	<	SynchronousQueue q = new SynchronousQueue();
322	>	public void testRemove()      { testRemove(false); }
323	>	public void testRemove_fair() { testRemove(true); }
324	>	public void testRemove(boolean fair) {
325	>	final SynchronousQueue q = new SynchronousQueue(fair);
326		try {
327		q.remove();
328		shouldThrow();
#	Line 334 | Line 330 | public class SynchronousQueueTest extend
330		}
331
332		/**
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	–	/**
333		* contains returns false
334		*/
335	<	public void testContains() {
336	<	SynchronousQueue q = new SynchronousQueue();
335	>	public void testContains()      { testContains(false); }
336	>	public void testContains_fair() { testContains(true); }
337	>	public void testContains(boolean fair) {
338	>	final SynchronousQueue q = new SynchronousQueue(fair);
339		assertFalse(q.contains(zero));
340		}
341
342		/**
343		* clear ensures isEmpty
344		*/
345	<	public void testClear() {
346	<	SynchronousQueue q = new SynchronousQueue();
345	>	public void testClear()      { testClear(false); }
346	>	public void testClear_fair() { testClear(true); }
347	>	public void testClear(boolean fair) {
348	>	final SynchronousQueue q = new SynchronousQueue(fair);
349		q.clear();
350		assertTrue(q.isEmpty());
351		}
#	Line 362 | Line 353 | public class SynchronousQueueTest extend
353		/**
354		* containsAll returns false unless empty
355		*/
356	<	public void testContainsAll() {
357	<	SynchronousQueue q = new SynchronousQueue();
356	>	public void testContainsAll()      { testContainsAll(false); }
357	>	public void testContainsAll_fair() { testContainsAll(true); }
358	>	public void testContainsAll(boolean fair) {
359	>	final SynchronousQueue q = new SynchronousQueue(fair);
360		Integer[] empty = new Integer[0];
361		assertTrue(q.containsAll(Arrays.asList(empty)));
362		Integer[] ints = new Integer[1]; ints[0] = zero;
#	Line 373 | Line 366 | public class SynchronousQueueTest extend
366		/**
367		* retainAll returns false
368		*/
369	<	public void testRetainAll() {
370	<	SynchronousQueue q = new SynchronousQueue();
369	>	public void testRetainAll()      { testRetainAll(false); }
370	>	public void testRetainAll_fair() { testRetainAll(true); }
371	>	public void testRetainAll(boolean fair) {
372	>	final SynchronousQueue q = new SynchronousQueue(fair);
373		Integer[] empty = new Integer[0];
374		assertFalse(q.retainAll(Arrays.asList(empty)));
375		Integer[] ints = new Integer[1]; ints[0] = zero;
#	Line 384 | Line 379 | public class SynchronousQueueTest extend
379		/**
380		* removeAll returns false
381		*/
382	<	public void testRemoveAll() {
383	<	SynchronousQueue q = new SynchronousQueue();
382	>	public void testRemoveAll()      { testRemoveAll(false); }
383	>	public void testRemoveAll_fair() { testRemoveAll(true); }
384	>	public void testRemoveAll(boolean fair) {
385	>	final SynchronousQueue q = new SynchronousQueue(fair);
386		Integer[] empty = new Integer[0];
387		assertFalse(q.removeAll(Arrays.asList(empty)));
388		Integer[] ints = new Integer[1]; ints[0] = zero;
#	Line 395 | Line 392 | public class SynchronousQueueTest extend
392		/**
393		* toArray is empty
394		*/
395	<	public void testToArray() {
396	<	SynchronousQueue q = new SynchronousQueue();
395	>	public void testToArray()      { testToArray(false); }
396	>	public void testToArray_fair() { testToArray(true); }
397	>	public void testToArray(boolean fair) {
398	>	final SynchronousQueue q = new SynchronousQueue(fair);
399		Object[] o = q.toArray();
400	<	assertEquals(o.length, 0);
400	>	assertEquals(0, o.length);
401		}
402
403		/**
404	<	* toArray(a) is nulled at position 0
404	>	* toArray(Integer array) returns its argument with the first
405	>	* element (if present) nulled out
406		*/
407	<	public void testToArray2() {
408	<	SynchronousQueue q = new SynchronousQueue();
409	<	Integer[] ints = new Integer[1];
410	<	assertNull(ints[0]);
407	>	public void testToArray2()      { testToArray2(false); }
408	>	public void testToArray2_fair() { testToArray2(true); }
409	>	public void testToArray2(boolean fair) {
410	>	final SynchronousQueue<Integer> q = new SynchronousQueue<>(fair);
411	>	Integer[] a;
412	>
413	>	a = new Integer[0];
414	>	assertSame(a, q.toArray(a));
415	>
416	>	a = new Integer[3];
417	>	Arrays.fill(a, 42);
418	>	assertSame(a, q.toArray(a));
419	>	assertNull(a[0]);
420	>	for (int i = 1; i < a.length; i++)
421	>	assertEquals(42, (int) a[i]);
422		}
423
424		/**
425		* toArray(null) throws NPE
426		*/
427	<	public void testToArray_BadArg() {
428	<	SynchronousQueue q = new SynchronousQueue();
427	>	public void testToArray_null()      { testToArray_null(false); }
428	>	public void testToArray_null_fair() { testToArray_null(true); }
429	>	public void testToArray_null(boolean fair) {
430	>	final SynchronousQueue q = new SynchronousQueue(fair);
431		try {
432	<	Object o[] = q.toArray(null);
432	>	Object[] o = q.toArray(null);
433		shouldThrow();
434		} catch (NullPointerException success) {}
435		}
#	Line 424 | Line 437 | public class SynchronousQueueTest extend
437		/**
438		* iterator does not traverse any elements
439		*/
440	<	public void testIterator() {
441	<	SynchronousQueue q = new SynchronousQueue();
442	<	Iterator it = q.iterator();
443	<	assertFalse(it.hasNext());
431	<	try {
432	<	Object x = it.next();
433	<	shouldThrow();
434	<	} catch (NoSuchElementException success) {}
440	>	public void testIterator()      { testIterator(false); }
441	>	public void testIterator_fair() { testIterator(true); }
442	>	public void testIterator(boolean fair) {
443	>	assertIteratorExhausted(new SynchronousQueue(fair).iterator());
444		}
445
446		/**
447		* iterator remove throws ISE
448		*/
449	<	public void testIteratorRemove() {
450	<	SynchronousQueue q = new SynchronousQueue();
449	>	public void testIteratorRemove()      { testIteratorRemove(false); }
450	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
451	>	public void testIteratorRemove(boolean fair) {
452	>	final SynchronousQueue q = new SynchronousQueue(fair);
453		Iterator it = q.iterator();
454		try {
455		it.remove();
#	Line 449 | Line 460 | public class SynchronousQueueTest extend
460		/**
461		* toString returns a non-null string
462		*/
463	<	public void testToString() {
464	<	SynchronousQueue q = new SynchronousQueue();
463	>	public void testToString()      { testToString(false); }
464	>	public void testToString_fair() { testToString(true); }
465	>	public void testToString(boolean fair) {
466	>	final SynchronousQueue q = new SynchronousQueue(fair);
467		String s = q.toString();
468		assertNotNull(s);
469		}
#	Line 458 | Line 471 | public class SynchronousQueueTest extend
471		/**
472		* offer transfers elements across Executor tasks
473		*/
474	<	public void testOfferInExecutor() {
475	<	final SynchronousQueue q = new SynchronousQueue();
476	<	ExecutorService executor = Executors.newFixedThreadPool(2);
474	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
475	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
476	>	public void testOfferInExecutor(boolean fair) {
477	>	final SynchronousQueue q = new SynchronousQueue(fair);
478		final CheckedBarrier threadsStarted = new CheckedBarrier(2);
479	+	final ExecutorService executor = Executors.newFixedThreadPool(2);
480	+	try (PoolCleaner cleaner = cleaner(executor)) {
481
482	<	executor.execute(new CheckedRunnable() {
483	<	public void realRun() throws InterruptedException {
484	<	assertFalse(q.offer(one));
485	<	threadsStarted.await();
486	<	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
487	<	assertEquals(0, q.remainingCapacity());
488	<	}});
489	<
490	<	executor.execute(new CheckedRunnable() {
491	<	public void realRun() throws InterruptedException {
492	<	threadsStarted.await();
493	<	assertSame(one, q.take());
494	<	}});
495	<
480	<	joinPool(executor);
482	>	executor.execute(new CheckedRunnable() {
483	>	public void realRun() throws InterruptedException {
484	>	assertFalse(q.offer(one));
485	>	threadsStarted.await();
486	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
487	>	assertEquals(0, q.remainingCapacity());
488	>	}});
489	>
490	>	executor.execute(new CheckedRunnable() {
491	>	public void realRun() throws InterruptedException {
492	>	threadsStarted.await();
493	>	assertSame(one, q.take());
494	>	}});
495	>	}
496		}
497
498		/**
499		* timed poll retrieves elements across Executor threads
500		*/
501	<	public void testPollInExecutor() {
502	<	final SynchronousQueue q = new SynchronousQueue();
501	>	public void testPollInExecutor()      { testPollInExecutor(false); }
502	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
503	>	public void testPollInExecutor(boolean fair) {
504	>	final SynchronousQueue q = new SynchronousQueue(fair);
505		final CheckedBarrier threadsStarted = new CheckedBarrier(2);
506	<	ExecutorService executor = Executors.newFixedThreadPool(2);
507	<	executor.execute(new CheckedRunnable() {
508	<	public void realRun() throws InterruptedException {
509	<	assertNull(q.poll());
510	<	threadsStarted.await();
511	<	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
512	<	assertTrue(q.isEmpty());
513	<	}});
514	<
515	<	executor.execute(new CheckedRunnable() {
516	<	public void realRun() throws InterruptedException {
517	<	threadsStarted.await();
518	<	q.put(one);
519	<	}});
520	<
521	<	joinPool(executor);
506	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
507	>	try (PoolCleaner cleaner = cleaner(executor)) {
508	>	executor.execute(new CheckedRunnable() {
509	>	public void realRun() throws InterruptedException {
510	>	assertNull(q.poll());
511	>	threadsStarted.await();
512	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
513	>	assertTrue(q.isEmpty());
514	>	}});
515	>
516	>	executor.execute(new CheckedRunnable() {
517	>	public void realRun() throws InterruptedException {
518	>	threadsStarted.await();
519	>	q.put(one);
520	>	}});
521	>	}
522		}
523
524		/**
525		* a deserialized serialized queue is usable
526		*/
527	<	public void testSerialization() throws Exception {
528	<	SynchronousQueue q = new SynchronousQueue();
529	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
530	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
531	<	out.writeObject(q);
532	<	out.close();
533	<
534	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
535	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
536	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
537	<	assertEquals(q.size(), r.size());
538	<	while (!q.isEmpty())
539	<	assertEquals(q.remove(), r.remove());
540	<	}
541	<
542	<	/**
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) {}
534	<	}
535	<
536	<	/**
537	<	* drainTo(this) throws IAE
538	<	*/
539	<	public void testDrainToSelf() {
540	<	SynchronousQueue q = new SynchronousQueue();
541	<	try {
542	<	q.drainTo(q);
543	<	shouldThrow();
544	<	} catch (IllegalArgumentException success) {}
527	>	public void testSerialization() {
528	>	final SynchronousQueue x = new SynchronousQueue();
529	>	final SynchronousQueue y = new SynchronousQueue(false);
530	>	final SynchronousQueue z = new SynchronousQueue(true);
531	>	assertSerialEquals(x, y);
532	>	assertNotSerialEquals(x, z);
533	>	SynchronousQueue[] qs = { x, y, z };
534	>	for (SynchronousQueue q : qs) {
535	>	SynchronousQueue clone = serialClone(q);
536	>	assertNotSame(q, clone);
537	>	assertSerialEquals(q, clone);
538	>	assertTrue(clone.isEmpty());
539	>	assertEquals(0, clone.size());
540	>	assertEquals(0, clone.remainingCapacity());
541	>	assertFalse(clone.offer(zero));
542	>	}
543		}
544
545		/**
546		* drainTo(c) of empty queue doesn't transfer elements
547		*/
548	<	public void testDrainTo() {
549	<	SynchronousQueue q = new SynchronousQueue();
548	>	public void testDrainTo()      { testDrainTo(false); }
549	>	public void testDrainTo_fair() { testDrainTo(true); }
550	>	public void testDrainTo(boolean fair) {
551	>	final SynchronousQueue q = new SynchronousQueue(fair);
552		ArrayList l = new ArrayList();
553		q.drainTo(l);
554	<	assertEquals(q.size(), 0);
555	<	assertEquals(l.size(), 0);
554	>	assertEquals(0, q.size());
555	>	assertEquals(0, l.size());
556		}
557
558		/**
559		* drainTo empties queue, unblocking a waiting put.
560		*/
561	<	public void testDrainToWithActivePut() throws InterruptedException {
562	<	final SynchronousQueue q = new SynchronousQueue();
561	>	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
562	>	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
563	>	public void testDrainToWithActivePut(boolean fair) {
564	>	final SynchronousQueue q = new SynchronousQueue(fair);
565		Thread t = newStartedThread(new CheckedRunnable() {
566		public void realRun() throws InterruptedException {
567		q.put(one);
#	Line 573 | Line 575 | public class SynchronousQueueTest extend
575		fail("timed out");
576		Thread.yield();
577		}
578	<	assertTrue(l.size() == 1);
578	>	assertEquals(1, l.size());
579		assertSame(one, l.get(0));
580		awaitTermination(t);
581		}
582
583		/**
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	–	/**
584		* drainTo(c, n) empties up to n elements of queue into c
585		*/
586		public void testDrainToN() throws InterruptedException {
#	Line 616 | Line 596 | public class SynchronousQueueTest extend
596		}});
597
598		ArrayList l = new ArrayList();
599	<	delay(SHORT_DELAY_MS);
600	<	q.drainTo(l, 1);
599	>	int drained;
600	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
601	>	assertEquals(1, drained);
602		assertEquals(1, l.size());
603	<	q.drainTo(l, 1);
603	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
604	>	assertEquals(1, drained);
605		assertEquals(2, l.size());
606		assertTrue(l.contains(one));
607		assertTrue(l.contains(two));
#	Line 627 | Line 609 | public class SynchronousQueueTest extend
609		awaitTermination(t2);
610		}
611
612	+	/**
613	+	* remove(null), contains(null) always return false
614	+	*/
615	+	public void testNeverContainsNull() {
616	+	Collection<?> q = new SynchronousQueue();
617	+	assertFalse(q.contains(null));
618	+	assertFalse(q.remove(null));
619	+	}
620	+
621		}

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