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Comparing jsr166/src/test/tck/SynchronousQueueTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 18:20:08 2003 UTC vs.
Revision 1.64 by jsr166, Tue Aug 13 00:54:51 2019 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
10	<	import java.util.*;
11	<	import java.util.concurrent.*;
12	<	import java.io.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
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
27	<	public static void main(String[] args) {
28	<	junit.textui.TestRunner.run (suite());
27	>	public static class Fair extends BlockingQueueTest {
28	>	protected BlockingQueue emptyCollection() {
29	>	return new SynchronousQueue(true);
30	>	}
31		}
32
33	<	public static Test suite() {
34	<	return new TestSuite(SynchronousQueueTest.class);
33	>	public static class NonFair extends BlockingQueueTest {
34	>	protected BlockingQueue emptyCollection() {
35	>	return new SynchronousQueue(false);
36	>	}
37		}
38
39	<	/**
40	<	*
25	<	*/
26	<	public void testEmptyFull() {
27	<	SynchronousQueue q = new SynchronousQueue();
28	<	assertTrue(q.isEmpty());
29	<	assertEquals(0, q.size());
30	<	assertEquals(0, q.remainingCapacity());
31	<	assertFalse(q.offer(new Integer(3)));
39	>	public static void main(String[] args) {
40	>	main(suite(), args);
41		}
42
43	<	/**
44	<	*
45	<	*/
46	<	public void testOfferNull() {
38	<	try {
39	<	SynchronousQueue q = new SynchronousQueue();
40	<	q.offer(null);
41	<	shouldThrow();
42	<	} catch (NullPointerException success) { }
43	>	public static Test suite() {
44	>	return newTestSuite(SynchronousQueueTest.class,
45	>	new Fair().testSuite(),
46	>	new NonFair().testSuite());
47		}
48
49		/**
50	<	*
50	>	* Any SynchronousQueue is both empty and full
51		*/
52	<	public void testOffer() {
53	<	SynchronousQueue q = new SynchronousQueue();
54	<	assertFalse(q.offer(new Integer(1)));
52	>	public void testEmptyFull()      { testEmptyFull(false); }
53	>	public void testEmptyFull_fair() { testEmptyFull(true); }
54	>	public void testEmptyFull(boolean fair) {
55	>	final SynchronousQueue q = new SynchronousQueue(fair);
56	>	assertTrue(q.isEmpty());
57	>	assertEquals(0, q.size());
58	>	assertEquals(0, q.remainingCapacity());
59	>	assertFalse(q.offer(zero));
60		}
61
62		/**
63	<	*
63	>	* offer fails if no active taker
64		*/
65	<	public void testAdd() {
66	<	try {
67	<	SynchronousQueue q = new SynchronousQueue();
68	<	assertEquals(0, q.remainingCapacity());
69	<	q.add(new Integer(0));
61	<	} catch (IllegalStateException success){
62	<	}
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	<	*
73	>	* add throws IllegalStateException if no active taker
74		*/
75	<	public void testAddAll1() {
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 {
81	<	SynchronousQueue q = new SynchronousQueue();
71	<	q.addAll(null);
81	>	q.add(one);
82		shouldThrow();
83	<	}
74	<	catch (NullPointerException success) {}
83	>	} catch (IllegalStateException success) {}
84		}
85	+
86		/**
87	<	*
87	>	* addAll(this) throws IllegalArgumentException
88		*/
89	<	public void testAddAll2() {
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 {
94	<	SynchronousQueue q = new SynchronousQueue();
82	<	Integer[] ints = new Integer[1];
83	<	q.addAll(Arrays.asList(ints));
94	>	q.addAll(q);
95		shouldThrow();
96	<	}
86	<	catch (NullPointerException success) {}
96	>	} catch (IllegalArgumentException success) {}
97		}
98	+
99		/**
100	<	*
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();
94	<	Integer[] ints = new Integer[1];
95	<	for (int i = 0; i < 1; ++i)
96	<	ints[i] = new Integer(i);
97	<	q.addAll(Arrays.asList(ints));
111	>	q.addAll(coll);
112		shouldThrow();
113	<	}
100	<	catch (IllegalStateException success) {}
113	>	} catch (IllegalStateException success) {}
114		}
115
116		/**
117	<	*
117	>	* put blocks interruptibly if no active taker
118		*/
119	<	public void testPutNull() {
120	<	try {
121	<	SynchronousQueue q = new SynchronousQueue();
122	<	q.put(null);
123	<	shouldThrow();
124	<	}
125	<	catch (NullPointerException success){
126	<	}
127	<	catch (InterruptedException ie) {
128	<	unexpectedException();
129	<	}
130	<	}
119	>	public void testBlockingPut()      { testBlockingPut(false); }
120	>	public void testBlockingPut_fair() { testBlockingPut(true); }
121	>	public void testBlockingPut(boolean fair) {
122	>	final SynchronousQueue q = new SynchronousQueue(fair);
123	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
124	>	Thread t = newStartedThread(new CheckedRunnable() {
125	>	public void realRun() throws InterruptedException {
126	>	Thread.currentThread().interrupt();
127	>	try {
128	>	q.put(99);
129	>	shouldThrow();
130	>	} catch (InterruptedException success) {}
131	>	assertFalse(Thread.interrupted());
132
133	<	/**
134	<	*
135	<	*/
136	<	public void testBlockingPut() {
137	<	Thread t = new Thread(new Runnable() {
138	<	public void run() {
139	<	try {
140	<	SynchronousQueue q = new SynchronousQueue();
141	<	q.put(new Integer(0));
142	<	threadShouldThrow();
143	<	} catch (InterruptedException ie){
144	<	}
145	<	}});
132	<	t.start();
133	<	try {
134	<	Thread.sleep(SHORT_DELAY_MS);
135	<	t.interrupt();
136	<	t.join();
137	<	}
138	<	catch (InterruptedException ie) {
139	<	unexpectedException();
140	<	}
133	>	pleaseInterrupt.countDown();
134	>	try {
135	>	q.put(99);
136	>	shouldThrow();
137	>	} catch (InterruptedException success) {}
138	>	assertFalse(Thread.interrupted());
139	>	}});
140	>
141	>	await(pleaseInterrupt);
142	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
143	>	t.interrupt();
144	>	awaitTermination(t);
145	>	assertEquals(0, q.remainingCapacity());
146		}
147
148		/**
149	<	*
149	>	* put blocks interruptibly waiting for take
150		*/
151	<	public void testPutWithTake() {
152	<	final SynchronousQueue q = new SynchronousQueue();
153	<	Thread t = new Thread(new Runnable() {
154	<	public void run() {
155	<	int added = 0;
156	<	try {
157	<	q.put(new Object());
158	<	++added;
159	<	q.put(new Object());
160	<	++added;
161	<	q.put(new Object());
162	<	++added;
163	<	q.put(new Object());
164	<	++added;
165	<	threadShouldThrow();
166	<	} catch (InterruptedException e){
167	<	assertTrue(added >= 1);
168	<	}
169	<	}
170	<	});
171	<	try {
172	<	t.start();
173	<	Thread.sleep(SHORT_DELAY_MS);
174	<	q.take();
175	<	Thread.sleep(SHORT_DELAY_MS);
176	<	t.interrupt();
177	<	t.join();
178	<	} catch (Exception e){
179	<	unexpectedException();
180	<	}
151	>	public void testPutWithTake()      { testPutWithTake(false); }
152	>	public void testPutWithTake_fair() { testPutWithTake(true); }
153	>	public void testPutWithTake(boolean fair) {
154	>	final SynchronousQueue q = new SynchronousQueue(fair);
155	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
156	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
157	>	Thread t = newStartedThread(new CheckedRunnable() {
158	>	public void realRun() throws InterruptedException {
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);
172	>	shouldThrow();
173	>	} catch (InterruptedException success) {}
174	>	assertFalse(Thread.interrupted());
175	>	}});
176	>
177	>	await(pleaseTake);
178	>	assertEquals(0, q.remainingCapacity());
179	>	try { assertSame(one, q.take()); }
180	>	catch (InterruptedException e) { threadUnexpectedException(e); }
181	>
182	>	await(pleaseInterrupt);
183	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
184	>	t.interrupt();
185	>	awaitTermination(t);
186	>	assertEquals(0, q.remainingCapacity());
187		}
188
189		/**
190	<	*
190	>	* timed offer times out if elements not taken
191		*/
192		public void testTimedOffer() {
193	<	final SynchronousQueue q = new SynchronousQueue();
194	<	Thread t = new Thread(new Runnable() {
195	<	public void run() {
196	<	try {
197	<
198	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
188	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
189	<	threadShouldThrow();
190	<	} catch (InterruptedException success){}
191	<	}
192	<	});
193	<
194	<	try {
195	<	t.start();
196	<	Thread.sleep(SMALL_DELAY_MS);
197	<	t.interrupt();
198	<	t.join();
199	<	} catch (Exception e){
200	<	unexpectedException();
201	<	}
202	<	}
193	>	final boolean fair = randomBoolean();
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	<	/**
204	<	*
205	<	*/
206	<	public void testTakeFromEmpty() {
207	<	final SynchronousQueue q = new SynchronousQueue();
208	<	Thread t = new Thread(new Runnable() {
209	<	public void run() {
210	<	try {
211	<	q.take();
212	<	threadShouldThrow();
213	<	} catch (InterruptedException success){ }
214	<	}
215	<	});
216	<	try {
217	<	t.start();
218	<	Thread.sleep(SHORT_DELAY_MS);
219	<	t.interrupt();
220	<	t.join();
221	<	} catch (Exception e){
222	<	unexpectedException();
223	<	}
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(), 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	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
222	>	t.interrupt();
223	>	awaitTermination(t);
224		}
225
226		/**
227	<	*
227	>	* poll return null if no active putter
228		*/
229	<	public void testPoll() {
230	<	SynchronousQueue q = new SynchronousQueue();
231	<	assertNull(q.poll());
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	<	*
237	>	* timed poll with zero timeout times out if no active putter
238		*/
239	<	public void testTimedPoll0() {
240	<	try {
241	<	SynchronousQueue q = new SynchronousQueue();
242	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
243	<	} catch (InterruptedException e){
244	<	unexpectedException();
245	<	}
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	<	*
248	>	* timed poll with nonzero timeout times out if no active putter
249		*/
250		public void testTimedPoll() {
251	<	try {
252	<	SynchronousQueue q = new SynchronousQueue();
253	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
254	<	} catch (InterruptedException e){
255	<	unexpectedException();
256	<	}
251	>	final boolean fair = randomBoolean();
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
259		/**
260	<	*
261	<	*/
263	<	public void testInterruptedTimedPoll() {
264	<	Thread t = new Thread(new Runnable() {
265	<	public void run() {
266	<	try {
267	<	SynchronousQueue q = new SynchronousQueue();
268	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
269	<	} catch (InterruptedException success){
270	<	}
271	<	}});
272	<	t.start();
273	<	try {
274	<	Thread.sleep(SHORT_DELAY_MS);
275	<	t.interrupt();
276	<	t.join();
277	<	}
278	<	catch (InterruptedException ie) {
279	<	unexpectedException();
280	<	}
281	<	}
282	<
283	<	/**
284	<	*
260	>	* timed poll before a delayed offer times out, returning null;
261	>	* after offer succeeds; on interruption throws
262		*/
263		public void testTimedPollWithOffer() {
264	<	final SynchronousQueue q = new SynchronousQueue();
265	<	Thread t = new Thread(new Runnable() {
266	<	public void run() {
267	<	try {
268	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
269	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
270	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
271	<	threadShouldThrow();
272	<	} catch (InterruptedException success) { }
273	<	}
274	<	});
275	<	try {
276	<	t.start();
277	<	Thread.sleep(SMALL_DELAY_MS);
278	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
279	<	t.interrupt();
280	<	t.join();
281	<	} catch (Exception e){
282	<	unexpectedException();
283	<	}
284	<	}
264	>	final boolean fair = randomBoolean();
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 startTime = System.nanoTime();
271	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
272	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
273	>
274	>	pleaseOffer.countDown();
275	>	startTime = System.nanoTime();
276	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
277	>
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	>	assertFalse(Thread.interrupted());
291	>
292	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
293	>	}});
294
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);
305	+	}
306
307		/**
308	<	*
308	>	* peek() returns null if no active putter
309		*/
310	<	public void testPeek() {
311	<	SynchronousQueue q = new SynchronousQueue();
312	<	assertNull(q.peek());
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	<	*
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();
327	<	}
327	<	catch (NoSuchElementException success) {}
327	>	} catch (NoSuchElementException success) {}
328		}
329
330		/**
331	<	*
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();
340	<	} catch (NoSuchElementException success){
339	<	}
340	>	} catch (NoSuchElementException success) {}
341		}
342
343		/**
344	<	*
344	<	*/
345	<	public void testRemoveElement() {
346	<	SynchronousQueue q = new SynchronousQueue();
347	<	assertFalse(q.remove(new Integer(0)));
348	<	assertTrue(q.isEmpty());
349	<	}
350	<
351	<	/**
352	<	*
344	>	* contains returns false
345		*/
346	<	public void testContains() {
347	<	SynchronousQueue q = new SynchronousQueue();
348	<	assertFalse(q.contains(new Integer(0)));
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	<	*
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		}
363
364		/**
365	<	*
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	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
372	>	assertTrue(q.containsAll(Arrays.asList(empty)));
373	>	Integer[] ints = new Integer[1]; ints[0] = zero;
374		assertFalse(q.containsAll(Arrays.asList(ints)));
375		}
376
377		/**
378	<	*
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	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
386	<	q.retainAll(Arrays.asList(ints));
387	<	assertFalse(q.containsAll(Arrays.asList(ints)));
385	>	assertFalse(q.retainAll(Arrays.asList(empty)));
386	>	Integer[] ints = new Integer[1]; ints[0] = zero;
387	>	assertFalse(q.retainAll(Arrays.asList(ints)));
388		}
389
390		/**
391	<	*
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	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
399	<	q.removeAll(Arrays.asList(ints));
398	>	assertFalse(q.removeAll(Arrays.asList(empty)));
399	>	Integer[] ints = new Integer[1]; ints[0] = zero;
400		assertFalse(q.containsAll(Arrays.asList(ints)));
401		}
402
400	–
403		/**
404	<	*
404	>	* toArray is empty
405		*/
406	<	public void testToArray() {
407	<	SynchronousQueue q = new SynchronousQueue();
408	<	Object[] o = q.toArray();
409	<	assertEquals(o.length, 0);
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(0, o.length);
412		}
413
414		/**
415	<	*
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	<
434	>
435		/**
436	<	*
436	>	* toArray(null) throws NPE
437		*/
438	<	public void testIterator() {
439	<	SynchronousQueue q = new SynchronousQueue();
440	<	Iterator it = q.iterator();
441	<	assertFalse(it.hasNext());
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 x = it.next();
443	>	Object[] o = q.toArray((Object[])null);
444		shouldThrow();
445	<	}
446	<	catch (NoSuchElementException success) {}
445	>	} catch (NullPointerException success) {}
446	>	}
447	>
448	>	/**
449	>	* iterator does not traverse any elements
450	>	*/
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	<	*
458	>	* iterator remove throws IllegalStateException
459		*/
460	<	public void testIteratorRemove() {
461	<	SynchronousQueue q = new SynchronousQueue();
462	<	Iterator it = q.iterator();
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();
467		shouldThrow();
468	<	}
443	<	catch (IllegalStateException success) {}
468	>	} catch (IllegalStateException success) {}
469		}
470
471		/**
472	<	*
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	<	assertTrue(s != null);
480	<	}
454	<
479	>	assertNotNull(s);
480	>	}
481
482		/**
483	<	*
483	>	* offer transfers elements across Executor tasks
484		*/
485	<	public void testOfferInExecutor() {
486	<	final SynchronousQueue q = new SynchronousQueue();
487	<	ExecutorService executor = Executors.newFixedThreadPool(2);
488	<	final Integer one = new Integer(1);
489	<
490	<	executor.execute(new Runnable() {
491	<	public void run() {
492	<	threadAssertFalse(q.offer(one));
493	<	try {
494	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
495	<	threadAssertEquals(0, q.remainingCapacity());
496	<	}
497	<	catch (InterruptedException e) {
498	<	threadUnexpectedException();
499	<	}
474	<	}
475	<	});
476	<
477	<	executor.execute(new Runnable() {
478	<	public void run() {
479	<	try {
480	<	Thread.sleep(SMALL_DELAY_MS);
481	<	threadAssertEquals(one, q.take());
482	<	}
483	<	catch (InterruptedException e) {
484	<	threadUnexpectedException();
485	<	}
486	<	}
487	<	});
488	<
489	<	joinPool(executor);
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	+	}
507		}
508
509		/**
510	<	*
510	>	* timed poll retrieves elements across Executor threads
511		*/
512	<	public void testPollInExecutor() {
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	>	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	<	final SynchronousQueue q = new SynchronousQueue();
527	>	executor.execute(new CheckedRunnable() {
528	>	public void realRun() throws InterruptedException {
529	>	threadsStarted.await();
530	>	q.put(one);
531	>	}});
532	>	}
533	>	}
534
535	<	ExecutorService executor = Executors.newFixedThreadPool(2);
535	>	/**
536	>	* a deserialized/reserialized queue is usable
537	>	*/
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	<	executor.execute(new Runnable() {
557	<	public void run() {
558	<	threadAssertNull(q.poll());
559	<	try {
560	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
561	<	threadAssertTrue(q.isEmpty());
562	<	}
563	<	catch (InterruptedException e) {
564	<	threadUnexpectedException();
565	<	}
566	<	}
567	<	});
556	>	/**
557	>	* drainTo(c) of empty queue doesn't transfer elements
558	>	*/
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(0, q.size());
566	>	assertEquals(0, l.size());
567	>	}
568
569	<	executor.execute(new Runnable() {
570	<	public void run() {
571	<	try {
572	<	Thread.sleep(SMALL_DELAY_MS);
573	<	q.put(new Integer(1));
574	<	}
575	<	catch (InterruptedException e) {
576	<	threadUnexpectedException();
577	<	}
578	<	}
579	<	});
526	<
527	<	joinPool(executor);
569	>	/**
570	>	* drainTo empties queue, unblocking a waiting put.
571	>	*/
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);
579	>	}});
580
581	+	ArrayList l = new ArrayList();
582	+	long startTime = System.nanoTime();
583	+	while (l.isEmpty()) {
584	+	q.drainTo(l);
585	+	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
586	+	fail("timed out");
587	+	Thread.yield();
588	+	}
589	+	assertEquals(1, l.size());
590	+	assertSame(one, l.get(0));
591	+	awaitTermination(t);
592		}
593
594		/**
595	<	*
595	>	* drainTo(c, n) empties up to n elements of queue into c
596		*/
597	<	public void testSerialization() {
598	<	SynchronousQueue q = new SynchronousQueue();
599	<	try {
600	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
601	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
602	<	out.writeObject(q);
603	<	out.close();
604	<
605	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
606	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
607	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
608	<	assertEquals(q.size(), r.size());
609	<	while (!q.isEmpty())
610	<	assertEquals(q.remove(), r.remove());
611	<	} catch(Exception e){
612	<	unexpectedException();
613	<	}
597	>	public void testDrainToN() throws InterruptedException {
598	>	final SynchronousQueue q = new SynchronousQueue();
599	>	Thread t1 = newStartedThread(new CheckedRunnable() {
600	>	public void realRun() throws InterruptedException {
601	>	q.put(one);
602	>	}});
603	>
604	>	Thread t2 = newStartedThread(new CheckedRunnable() {
605	>	public void realRun() throws InterruptedException {
606	>	q.put(two);
607	>	}});
608	>
609	>	ArrayList l = new ArrayList();
610	>	int drained;
611	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
612	>	assertEquals(1, drained);
613	>	assertEquals(1, l.size());
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));
619	>	awaitTermination(t1);
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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