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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 1.52 by jsr166, Sat Mar 18 20:42:20 2017 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	>
22	>	import junit.framework.Test;
23
24		public class SynchronousQueueTest extends JSR166TestCase {
25
26	<	public static void main(String[] args) {
27	<	junit.textui.TestRunner.run (suite());
26	>	public static class Fair extends BlockingQueueTest {
27	>	protected BlockingQueue emptyCollection() {
28	>	return new SynchronousQueue(true);
29	>	}
30		}
31
32	<	public static Test suite() {
33	<	return new TestSuite(SynchronousQueueTest.class);
32	>	public static class NonFair extends BlockingQueueTest {
33	>	protected BlockingQueue emptyCollection() {
34	>	return new SynchronousQueue(false);
35	>	}
36		}
37
38	<	/**
39	<	*
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)));
38	>	public static void main(String[] args) {
39	>	main(suite(), args);
40		}
41
42	<	/**
43	<	*
44	<	*/
45	<	public void testOfferNull() {
38	<	try {
39	<	SynchronousQueue q = new SynchronousQueue();
40	<	q.offer(null);
41	<	shouldThrow();
42	<	} catch (NullPointerException success) { }
42	>	public static Test suite() {
43	>	return newTestSuite(SynchronousQueueTest.class,
44	>	new Fair().testSuite(),
45	>	new NonFair().testSuite());
46		}
47
48		/**
49	<	*
49	>	* Any SynchronousQueue is both empty and full
50		*/
51	<	public void testOffer() {
52	<	SynchronousQueue q = new SynchronousQueue();
53	<	assertFalse(q.offer(new Integer(1)));
51	>	public void testEmptyFull()      { testEmptyFull(false); }
52	>	public void testEmptyFull_fair() { testEmptyFull(true); }
53	>	public void testEmptyFull(boolean fair) {
54	>	final SynchronousQueue q = new SynchronousQueue(fair);
55	>	assertTrue(q.isEmpty());
56	>	assertEquals(0, q.size());
57	>	assertEquals(0, q.remainingCapacity());
58	>	assertFalse(q.offer(zero));
59		}
60
61		/**
62	<	*
62	>	* offer fails if no active taker
63		*/
64	<	public void testAdd() {
65	<	try {
66	<	SynchronousQueue q = new SynchronousQueue();
67	<	assertEquals(0, q.remainingCapacity());
68	<	q.add(new Integer(0));
61	<	} catch (IllegalStateException success){
62	<	}
64	>	public void testOffer()      { testOffer(false); }
65	>	public void testOffer_fair() { testOffer(true); }
66	>	public void testOffer(boolean fair) {
67	>	SynchronousQueue q = new SynchronousQueue(fair);
68	>	assertFalse(q.offer(one));
69		}
70
71		/**
72	<	*
72	>	* add throws IllegalStateException if no active taker
73		*/
74	<	public void testAddAll1() {
74	>	public void testAdd()      { testAdd(false); }
75	>	public void testAdd_fair() { testAdd(true); }
76	>	public void testAdd(boolean fair) {
77	>	SynchronousQueue q = new SynchronousQueue(fair);
78	>	assertEquals(0, q.remainingCapacity());
79		try {
80	<	SynchronousQueue q = new SynchronousQueue();
71	<	q.addAll(null);
80	>	q.add(one);
81		shouldThrow();
82	<	}
74	<	catch (NullPointerException success) {}
82	>	} catch (IllegalStateException success) {}
83		}
84	+
85		/**
86	<	*
86	>	* addAll(this) throws IllegalArgumentException
87		*/
88	<	public void testAddAll2() {
88	>	public void testAddAll_self()      { testAddAll_self(false); }
89	>	public void testAddAll_self_fair() { testAddAll_self(true); }
90	>	public void testAddAll_self(boolean fair) {
91	>	SynchronousQueue q = new SynchronousQueue(fair);
92		try {
93	<	SynchronousQueue q = new SynchronousQueue();
82	<	Integer[] ints = new Integer[1];
83	<	q.addAll(Arrays.asList(ints));
93	>	q.addAll(q);
94		shouldThrow();
95	<	}
86	<	catch (NullPointerException success) {}
95	>	} catch (IllegalArgumentException success) {}
96		}
97	+
98		/**
99	<	*
99	>	* addAll throws ISE if no active taker
100		*/
101	<	public void testAddAll4() {
101	>	public void testAddAll_ISE()      { testAddAll_ISE(false); }
102	>	public void testAddAll_ISE_fair() { testAddAll_ISE(true); }
103	>	public void testAddAll_ISE(boolean fair) {
104	>	SynchronousQueue q = new SynchronousQueue(fair);
105	>	Integer[] ints = new Integer[1];
106	>	for (int i = 0; i < ints.length; i++)
107	>	ints[i] = i;
108	>	Collection<Integer> coll = Arrays.asList(ints);
109		try {
110	<	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));
110	>	q.addAll(coll);
111		shouldThrow();
112	<	}
100	<	catch (IllegalStateException success) {}
112	>	} catch (IllegalStateException success) {}
113		}
114
115		/**
116	<	*
116	>	* put blocks interruptibly if no active taker
117		*/
118	<	public void testPutNull() {
119	<	try {
120	<	SynchronousQueue q = new SynchronousQueue();
121	<	q.put(null);
122	<	shouldThrow();
123	<	}
124	<	catch (NullPointerException success){
125	<	}
126	<	catch (InterruptedException ie) {
127	<	unexpectedException();
128	<	}
129	<	}
118	>	public void testBlockingPut()      { testBlockingPut(false); }
119	>	public void testBlockingPut_fair() { testBlockingPut(true); }
120	>	public void testBlockingPut(boolean fair) {
121	>	final SynchronousQueue q = new SynchronousQueue(fair);
122	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
123	>	Thread t = newStartedThread(new CheckedRunnable() {
124	>	public void realRun() throws InterruptedException {
125	>	Thread.currentThread().interrupt();
126	>	try {
127	>	q.put(99);
128	>	shouldThrow();
129	>	} catch (InterruptedException success) {}
130	>	assertFalse(Thread.interrupted());
131
132	<	/**
133	<	*
134	<	*/
135	<	public void testBlockingPut() {
136	<	Thread t = new Thread(new Runnable() {
137	<	public void run() {
138	<	try {
139	<	SynchronousQueue q = new SynchronousQueue();
140	<	q.put(new Integer(0));
141	<	threadShouldThrow();
142	<	} catch (InterruptedException ie){
143	<	}
144	<	}});
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	<	}
132	>	pleaseInterrupt.countDown();
133	>	try {
134	>	q.put(99);
135	>	shouldThrow();
136	>	} catch (InterruptedException success) {}
137	>	assertFalse(Thread.interrupted());
138	>	}});
139	>
140	>	await(pleaseInterrupt);
141	>	assertThreadStaysAlive(t);
142	>	t.interrupt();
143	>	awaitTermination(t);
144	>	assertEquals(0, q.remainingCapacity());
145		}
146
147		/**
148	<	*
148	>	* put blocks interruptibly waiting for take
149		*/
150	<	public void testPutWithTake() {
151	<	final SynchronousQueue q = new SynchronousQueue();
152	<	Thread t = new Thread(new Runnable() {
153	<	public void run() {
154	<	int added = 0;
155	<	try {
156	<	q.put(new Object());
157	<	++added;
158	<	q.put(new Object());
159	<	++added;
156	<	q.put(new Object());
157	<	++added;
158	<	q.put(new Object());
159	<	++added;
160	<	threadShouldThrow();
161	<	} catch (InterruptedException e){
162	<	assertTrue(added >= 1);
163	<	}
164	<	}
165	<	});
166	<	try {
167	<	t.start();
168	<	Thread.sleep(SHORT_DELAY_MS);
169	<	q.take();
170	<	Thread.sleep(SHORT_DELAY_MS);
171	<	t.interrupt();
172	<	t.join();
173	<	} catch (Exception e){
174	<	unexpectedException();
175	<	}
176	<	}
150	>	public void testPutWithTake()      { testPutWithTake(false); }
151	>	public void testPutWithTake_fair() { testPutWithTake(true); }
152	>	public void testPutWithTake(boolean fair) {
153	>	final SynchronousQueue q = new SynchronousQueue(fair);
154	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
155	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
156	>	Thread t = newStartedThread(new CheckedRunnable() {
157	>	public void realRun() throws InterruptedException {
158	>	pleaseTake.countDown();
159	>	q.put(one);
160
161	<	/**
162	<	*
163	<	*/
164	<	public void testTimedOffer() {
165	<	final SynchronousQueue q = new SynchronousQueue();
166	<	Thread t = new Thread(new Runnable() {
167	<	public void run() {
185	<	try {
186	<
187	<	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	<	}
161	>	pleaseInterrupt.countDown();
162	>	try {
163	>	q.put(99);
164	>	shouldThrow();
165	>	} catch (InterruptedException success) {}
166	>	assertFalse(Thread.interrupted());
167	>	}});
168
169	+	await(pleaseTake);
170	+	assertEquals(0, q.remainingCapacity());
171	+	try { assertSame(one, q.take()); }
172	+	catch (InterruptedException e) { threadUnexpectedException(e); }
173
174	<	/**
175	<	*
176	<	*/
177	<	public void testTakeFromEmpty() {
178	<	final SynchronousQueue q = new SynchronousQueue();
210	<	Thread t = new Thread(new Runnable() {
211	<	public void run() {
212	<	try {
213	<	q.take();
214	<	threadShouldThrow();
215	<	} catch (InterruptedException success){ }
216	<	}
217	<	});
218	<	try {
219	<	t.start();
220	<	Thread.sleep(SHORT_DELAY_MS);
221	<	t.interrupt();
222	<	t.join();
223	<	} catch (Exception e){
224	<	unexpectedException();
225	<	}
174	>	await(pleaseInterrupt);
175	>	assertThreadStaysAlive(t);
176	>	t.interrupt();
177	>	awaitTermination(t);
178	>	assertEquals(0, q.remainingCapacity());
179		}
180
181		/**
182	<	*
182	>	* timed offer times out if elements not taken
183		*/
184	<	public void testPoll() {
185	<	SynchronousQueue q = new SynchronousQueue();
186	<	assertNull(q.poll());
184	>	public void testTimedOffer()      { testTimedOffer(false); }
185	>	public void testTimedOffer_fair() { testTimedOffer(true); }
186	>	public void testTimedOffer(boolean fair) {
187	>	final SynchronousQueue q = new SynchronousQueue(fair);
188	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
189	>	Thread t = newStartedThread(new CheckedRunnable() {
190	>	public void realRun() throws InterruptedException {
191	>	long startTime = System.nanoTime();
192	>	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
193	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
194	>	pleaseInterrupt.countDown();
195	>	try {
196	>	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
197	>	shouldThrow();
198	>	} catch (InterruptedException success) {}
199	>	}});
200	>
201	>	await(pleaseInterrupt);
202	>	assertThreadStaysAlive(t);
203	>	t.interrupt();
204	>	awaitTermination(t);
205		}
206
207		/**
208	<	*
208	>	* poll return null if no active putter
209		*/
210	<	public void testTimedPoll0() {
211	<	try {
212	<	SynchronousQueue q = new SynchronousQueue();
213	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
214	<	} catch (InterruptedException e){
244	<	unexpectedException();
245	<	}
210	>	public void testPoll()      { testPoll(false); }
211	>	public void testPoll_fair() { testPoll(true); }
212	>	public void testPoll(boolean fair) {
213	>	final SynchronousQueue q = new SynchronousQueue(fair);
214	>	assertNull(q.poll());
215		}
216
217		/**
218	<	*
218	>	* timed poll with zero timeout times out if no active putter
219		*/
220	<	public void testTimedPoll() {
221	<	try {
222	<	SynchronousQueue q = new SynchronousQueue();
223	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
224	<	} catch (InterruptedException e){
225	<	unexpectedException();
257	<	}
220	>	public void testTimedPoll0()      { testTimedPoll0(false); }
221	>	public void testTimedPoll0_fair() { testTimedPoll0(true); }
222	>	public void testTimedPoll0(boolean fair) {
223	>	final SynchronousQueue q = new SynchronousQueue(fair);
224	>	try { assertNull(q.poll(0, MILLISECONDS)); }
225	>	catch (InterruptedException e) { threadUnexpectedException(e); }
226		}
227
228		/**
229	<	*
230	<	*/
231	<	public void testInterruptedTimedPoll() {
232	<	Thread t = new Thread(new Runnable() {
233	<	public void run() {
234	<	try {
235	<	SynchronousQueue q = new SynchronousQueue();
236	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
237	<	} catch (InterruptedException success){
238	<	}
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	<	}
229	>	* timed poll with nonzero timeout times out if no active putter
230	>	*/
231	>	public void testTimedPoll()      { testTimedPoll(false); }
232	>	public void testTimedPoll_fair() { testTimedPoll(true); }
233	>	public void testTimedPoll(boolean fair) {
234	>	final SynchronousQueue q = new SynchronousQueue(fair);
235	>	long startTime = System.nanoTime();
236	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
237	>	catch (InterruptedException e) { threadUnexpectedException(e); }
238	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
239		}
240
241		/**
242	<	*
242	>	* timed poll before a delayed offer times out, returning null;
243	>	* after offer succeeds; on interruption throws
244		*/
245	<	public void testTimedPollWithOffer() {
246	<	final SynchronousQueue q = new SynchronousQueue();
247	<	Thread t = new Thread(new Runnable() {
248	<	public void run() {
249	<	try {
250	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
251	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
252	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
253	<	threadShouldThrow();
254	<	} catch (InterruptedException success) { }
255	<	}
256	<	});
257	<	try {
258	<	t.start();
259	<	Thread.sleep(SMALL_DELAY_MS);
260	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
261	<	t.interrupt();
262	<	t.join();
263	<	} catch (Exception e){
264	<	unexpectedException();
265	<	}
266	<	}
245	>	public void testTimedPollWithOffer()      { testTimedPollWithOffer(false); }
246	>	public void testTimedPollWithOffer_fair() { testTimedPollWithOffer(true); }
247	>	public void testTimedPollWithOffer(boolean fair) {
248	>	final SynchronousQueue q = new SynchronousQueue(fair);
249	>	final CountDownLatch pleaseOffer = new CountDownLatch(1);
250	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
251	>	Thread t = newStartedThread(new CheckedRunnable() {
252	>	public void realRun() throws InterruptedException {
253	>	long startTime = System.nanoTime();
254	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
255	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
256	>
257	>	pleaseOffer.countDown();
258	>	startTime = System.nanoTime();
259	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
260	>
261	>	Thread.currentThread().interrupt();
262	>	try {
263	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
264	>	shouldThrow();
265	>	} catch (InterruptedException success) {}
266	>	assertFalse(Thread.interrupted());
267
268	+	pleaseInterrupt.countDown();
269	+	try {
270	+	q.poll(LONG_DELAY_MS, MILLISECONDS);
271	+	shouldThrow();
272	+	} catch (InterruptedException success) {}
273	+	assertFalse(Thread.interrupted());
274	+
275	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
276	+	}});
277	+
278	+	await(pleaseOffer);
279	+	long startTime = System.nanoTime();
280	+	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
281	+	catch (InterruptedException e) { threadUnexpectedException(e); }
282	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
283	+
284	+	await(pleaseInterrupt);
285	+	assertThreadStaysAlive(t);
286	+	t.interrupt();
287	+	awaitTermination(t);
288	+	}
289
290		/**
291	<	*
291	>	* peek() returns null if no active putter
292		*/
293	<	public void testPeek() {
294	<	SynchronousQueue q = new SynchronousQueue();
295	<	assertNull(q.peek());
293	>	public void testPeek()      { testPeek(false); }
294	>	public void testPeek_fair() { testPeek(true); }
295	>	public void testPeek(boolean fair) {
296	>	final SynchronousQueue q = new SynchronousQueue(fair);
297	>	assertNull(q.peek());
298		}
299
300		/**
301	<	*
301	>	* element() throws NoSuchElementException if no active putter
302		*/
303	<	public void testElement() {
304	<	SynchronousQueue q = new SynchronousQueue();
303	>	public void testElement()      { testElement(false); }
304	>	public void testElement_fair() { testElement(true); }
305	>	public void testElement(boolean fair) {
306	>	final SynchronousQueue q = new SynchronousQueue(fair);
307		try {
308		q.element();
309		shouldThrow();
310	<	}
327	<	catch (NoSuchElementException success) {}
310	>	} catch (NoSuchElementException success) {}
311		}
312
313		/**
314	<	*
314	>	* remove() throws NoSuchElementException if no active putter
315		*/
316	<	public void testRemove() {
317	<	SynchronousQueue q = new SynchronousQueue();
316	>	public void testRemove()      { testRemove(false); }
317	>	public void testRemove_fair() { testRemove(true); }
318	>	public void testRemove(boolean fair) {
319	>	final SynchronousQueue q = new SynchronousQueue(fair);
320		try {
321		q.remove();
322		shouldThrow();
323	<	} catch (NoSuchElementException success){
339	<	}
323	>	} catch (NoSuchElementException success) {}
324		}
325
326		/**
327	<	*
327	>	* contains returns false
328		*/
329	<	public void testRemoveElement() {
330	<	SynchronousQueue q = new SynchronousQueue();
331	<	assertFalse(q.remove(new Integer(0)));
332	<	assertTrue(q.isEmpty());
333	<	}
350	<
351	<	/**
352	<	*
353	<	*/
354	<	public void testContains() {
355	<	SynchronousQueue q = new SynchronousQueue();
356	<	assertFalse(q.contains(new Integer(0)));
329	>	public void testContains()      { testContains(false); }
330	>	public void testContains_fair() { testContains(true); }
331	>	public void testContains(boolean fair) {
332	>	final SynchronousQueue q = new SynchronousQueue(fair);
333	>	assertFalse(q.contains(zero));
334		}
335
336		/**
337	<	*
337	>	* clear ensures isEmpty
338		*/
339	<	public void testClear() {
340	<	SynchronousQueue q = new SynchronousQueue();
339	>	public void testClear()      { testClear(false); }
340	>	public void testClear_fair() { testClear(true); }
341	>	public void testClear(boolean fair) {
342	>	final SynchronousQueue q = new SynchronousQueue(fair);
343		q.clear();
344		assertTrue(q.isEmpty());
345		}
346
347		/**
348	<	*
348	>	* containsAll returns false unless empty
349		*/
350	<	public void testContainsAll() {
351	<	SynchronousQueue q = new SynchronousQueue();
350	>	public void testContainsAll()      { testContainsAll(false); }
351	>	public void testContainsAll_fair() { testContainsAll(true); }
352	>	public void testContainsAll(boolean fair) {
353	>	final SynchronousQueue q = new SynchronousQueue(fair);
354		Integer[] empty = new Integer[0];
355	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
355	>	assertTrue(q.containsAll(Arrays.asList(empty)));
356	>	Integer[] ints = new Integer[1]; ints[0] = zero;
357		assertFalse(q.containsAll(Arrays.asList(ints)));
358		}
359
360		/**
361	<	*
361	>	* retainAll returns false
362		*/
363	<	public void testRetainAll() {
364	<	SynchronousQueue q = new SynchronousQueue();
363	>	public void testRetainAll()      { testRetainAll(false); }
364	>	public void testRetainAll_fair() { testRetainAll(true); }
365	>	public void testRetainAll(boolean fair) {
366	>	final SynchronousQueue q = new SynchronousQueue(fair);
367		Integer[] empty = new Integer[0];
368	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
369	<	q.retainAll(Arrays.asList(ints));
370	<	assertFalse(q.containsAll(Arrays.asList(ints)));
368	>	assertFalse(q.retainAll(Arrays.asList(empty)));
369	>	Integer[] ints = new Integer[1]; ints[0] = zero;
370	>	assertFalse(q.retainAll(Arrays.asList(ints)));
371		}
372
373		/**
374	<	*
374	>	* removeAll returns false
375		*/
376	<	public void testRemoveAll() {
377	<	SynchronousQueue q = new SynchronousQueue();
376	>	public void testRemoveAll()      { testRemoveAll(false); }
377	>	public void testRemoveAll_fair() { testRemoveAll(true); }
378	>	public void testRemoveAll(boolean fair) {
379	>	final SynchronousQueue q = new SynchronousQueue(fair);
380		Integer[] empty = new Integer[0];
381	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
382	<	q.removeAll(Arrays.asList(ints));
381	>	assertFalse(q.removeAll(Arrays.asList(empty)));
382	>	Integer[] ints = new Integer[1]; ints[0] = zero;
383		assertFalse(q.containsAll(Arrays.asList(ints)));
384		}
385
400	–
386		/**
387	<	*
387	>	* toArray is empty
388		*/
389	<	public void testToArray() {
390	<	SynchronousQueue q = new SynchronousQueue();
391	<	Object[] o = q.toArray();
392	<	assertEquals(o.length, 0);
389	>	public void testToArray()      { testToArray(false); }
390	>	public void testToArray_fair() { testToArray(true); }
391	>	public void testToArray(boolean fair) {
392	>	final SynchronousQueue q = new SynchronousQueue(fair);
393	>	Object[] o = q.toArray();
394	>	assertEquals(0, o.length);
395		}
396
397		/**
398	<	*
398	>	* toArray(Integer array) returns its argument with the first
399	>	* element (if present) nulled out
400		*/
401	<	public void testToArray2() {
402	<	SynchronousQueue q = new SynchronousQueue();
403	<	Integer[] ints = new Integer[1];
404	<	assertNull(ints[0]);
401	>	public void testToArray2()      { testToArray2(false); }
402	>	public void testToArray2_fair() { testToArray2(true); }
403	>	public void testToArray2(boolean fair) {
404	>	final SynchronousQueue<Integer> q = new SynchronousQueue<>(fair);
405	>	Integer[] a;
406	>
407	>	a = new Integer[0];
408	>	assertSame(a, q.toArray(a));
409	>
410	>	a = new Integer[3];
411	>	Arrays.fill(a, 42);
412	>	assertSame(a, q.toArray(a));
413	>	assertNull(a[0]);
414	>	for (int i = 1; i < a.length; i++)
415	>	assertEquals(42, (int) a[i]);
416		}
417	<
417	>
418		/**
419	<	*
419	>	* toArray(null) throws NPE
420		*/
421	<	public void testIterator() {
422	<	SynchronousQueue q = new SynchronousQueue();
423	<	Iterator it = q.iterator();
424	<	assertFalse(it.hasNext());
421	>	public void testToArray_null()      { testToArray_null(false); }
422	>	public void testToArray_null_fair() { testToArray_null(true); }
423	>	public void testToArray_null(boolean fair) {
424	>	final SynchronousQueue q = new SynchronousQueue(fair);
425		try {
426	<	Object x = it.next();
426	>	Object[] o = q.toArray(null);
427		shouldThrow();
428	<	}
430	<	catch (NoSuchElementException success) {}
428	>	} catch (NullPointerException success) {}
429		}
430
431		/**
432	<	*
432	>	* iterator does not traverse any elements
433		*/
434	<	public void testIteratorRemove() {
435	<	SynchronousQueue q = new SynchronousQueue();
436	<	Iterator it = q.iterator();
434	>	public void testIterator()      { testIterator(false); }
435	>	public void testIterator_fair() { testIterator(true); }
436	>	public void testIterator(boolean fair) {
437	>	assertIteratorExhausted(new SynchronousQueue(fair).iterator());
438	>	}
439	>
440	>	/**
441	>	* iterator remove throws ISE
442	>	*/
443	>	public void testIteratorRemove()      { testIteratorRemove(false); }
444	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
445	>	public void testIteratorRemove(boolean fair) {
446	>	final SynchronousQueue q = new SynchronousQueue(fair);
447	>	Iterator it = q.iterator();
448		try {
449		it.remove();
450		shouldThrow();
451	<	}
443	<	catch (IllegalStateException success) {}
451	>	} catch (IllegalStateException success) {}
452		}
453
454		/**
455	<	*
455	>	* toString returns a non-null string
456		*/
457	<	public void testToString() {
458	<	SynchronousQueue q = new SynchronousQueue();
457	>	public void testToString()      { testToString(false); }
458	>	public void testToString_fair() { testToString(true); }
459	>	public void testToString(boolean fair) {
460	>	final SynchronousQueue q = new SynchronousQueue(fair);
461		String s = q.toString();
462	<	assertTrue(s != null);
463	<	}
454	<
462	>	assertNotNull(s);
463	>	}
464
465		/**
466	<	*
466	>	* offer transfers elements across Executor tasks
467		*/
468	<	public void testOfferInExecutor() {
469	<	final SynchronousQueue q = new SynchronousQueue();
470	<	ExecutorService executor = Executors.newFixedThreadPool(2);
471	<	final Integer one = new Integer(1);
472	<
473	<	executor.execute(new Runnable() {
474	<	public void run() {
475	<	threadAssertFalse(q.offer(one));
476	<	try {
477	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
478	<	threadAssertEquals(0, q.remainingCapacity());
479	<	}
480	<	catch (InterruptedException e) {
481	<	threadUnexpectedException();
482	<	}
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);
468	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
469	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
470	>	public void testOfferInExecutor(boolean fair) {
471	>	final SynchronousQueue q = new SynchronousQueue(fair);
472	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
473	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
474	>	try (PoolCleaner cleaner = cleaner(executor)) {
475	>
476	>	executor.execute(new CheckedRunnable() {
477	>	public void realRun() throws InterruptedException {
478	>	assertFalse(q.offer(one));
479	>	threadsStarted.await();
480	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
481	>	assertEquals(0, q.remainingCapacity());
482	>	}});
483
484	+	executor.execute(new CheckedRunnable() {
485	+	public void realRun() throws InterruptedException {
486	+	threadsStarted.await();
487	+	assertSame(one, q.take());
488	+	}});
489	+	}
490		}
491
492		/**
493	<	*
493	>	* timed poll retrieves elements across Executor threads
494		*/
495	<	public void testPollInExecutor() {
495	>	public void testPollInExecutor()      { testPollInExecutor(false); }
496	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
497	>	public void testPollInExecutor(boolean fair) {
498	>	final SynchronousQueue q = new SynchronousQueue(fair);
499	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
500	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
501	>	try (PoolCleaner cleaner = cleaner(executor)) {
502	>	executor.execute(new CheckedRunnable() {
503	>	public void realRun() throws InterruptedException {
504	>	assertNull(q.poll());
505	>	threadsStarted.await();
506	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
507	>	assertTrue(q.isEmpty());
508	>	}});
509
510	<	final SynchronousQueue q = new SynchronousQueue();
510	>	executor.execute(new CheckedRunnable() {
511	>	public void realRun() throws InterruptedException {
512	>	threadsStarted.await();
513	>	q.put(one);
514	>	}});
515	>	}
516	>	}
517
518	<	ExecutorService executor = Executors.newFixedThreadPool(2);
518	>	/**
519	>	* a deserialized serialized queue is usable
520	>	*/
521	>	public void testSerialization() {
522	>	final SynchronousQueue x = new SynchronousQueue();
523	>	final SynchronousQueue y = new SynchronousQueue(false);
524	>	final SynchronousQueue z = new SynchronousQueue(true);
525	>	assertSerialEquals(x, y);
526	>	assertNotSerialEquals(x, z);
527	>	SynchronousQueue[] qs = { x, y, z };
528	>	for (SynchronousQueue q : qs) {
529	>	SynchronousQueue clone = serialClone(q);
530	>	assertNotSame(q, clone);
531	>	assertSerialEquals(q, clone);
532	>	assertTrue(clone.isEmpty());
533	>	assertEquals(0, clone.size());
534	>	assertEquals(0, clone.remainingCapacity());
535	>	assertFalse(clone.offer(zero));
536	>	}
537	>	}
538
539	<	executor.execute(new Runnable() {
540	<	public void run() {
541	<	threadAssertNull(q.poll());
542	<	try {
543	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
544	<	threadAssertTrue(q.isEmpty());
545	<	}
546	<	catch (InterruptedException e) {
547	<	threadUnexpectedException();
548	<	}
549	<	}
550	<	});
539	>	/**
540	>	* drainTo(c) of empty queue doesn't transfer elements
541	>	*/
542	>	public void testDrainTo()      { testDrainTo(false); }
543	>	public void testDrainTo_fair() { testDrainTo(true); }
544	>	public void testDrainTo(boolean fair) {
545	>	final SynchronousQueue q = new SynchronousQueue(fair);
546	>	ArrayList l = new ArrayList();
547	>	q.drainTo(l);
548	>	assertEquals(0, q.size());
549	>	assertEquals(0, l.size());
550	>	}
551
552	<	executor.execute(new Runnable() {
553	<	public void run() {
554	<	try {
555	<	Thread.sleep(SMALL_DELAY_MS);
556	<	q.put(new Integer(1));
557	<	}
558	<	catch (InterruptedException e) {
559	<	threadUnexpectedException();
560	<	}
561	<	}
562	<	});
526	<
527	<	joinPool(executor);
552	>	/**
553	>	* drainTo empties queue, unblocking a waiting put.
554	>	*/
555	>	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
556	>	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
557	>	public void testDrainToWithActivePut(boolean fair) {
558	>	final SynchronousQueue q = new SynchronousQueue(fair);
559	>	Thread t = newStartedThread(new CheckedRunnable() {
560	>	public void realRun() throws InterruptedException {
561	>	q.put(one);
562	>	}});
563
564	+	ArrayList l = new ArrayList();
565	+	long startTime = System.nanoTime();
566	+	while (l.isEmpty()) {
567	+	q.drainTo(l);
568	+	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
569	+	fail("timed out");
570	+	Thread.yield();
571	+	}
572	+	assertEquals(1, l.size());
573	+	assertSame(one, l.get(0));
574	+	awaitTermination(t);
575		}
576
577		/**
578	<	*
578	>	* drainTo(c, n) empties up to n elements of queue into c
579		*/
580	<	public void testSerialization() {
581	<	SynchronousQueue q = new SynchronousQueue();
582	<	try {
583	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
584	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
585	<	out.writeObject(q);
586	<	out.close();
587	<
588	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
589	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
590	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
591	<	assertEquals(q.size(), r.size());
592	<	while (!q.isEmpty())
593	<	assertEquals(q.remove(), r.remove());
594	<	} catch(Exception e){
595	<	unexpectedException();
596	<	}
580	>	public void testDrainToN() throws InterruptedException {
581	>	final SynchronousQueue q = new SynchronousQueue();
582	>	Thread t1 = newStartedThread(new CheckedRunnable() {
583	>	public void realRun() throws InterruptedException {
584	>	q.put(one);
585	>	}});
586	>
587	>	Thread t2 = newStartedThread(new CheckedRunnable() {
588	>	public void realRun() throws InterruptedException {
589	>	q.put(two);
590	>	}});
591	>
592	>	ArrayList l = new ArrayList();
593	>	int drained;
594	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
595	>	assertEquals(1, drained);
596	>	assertEquals(1, l.size());
597	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
598	>	assertEquals(1, drained);
599	>	assertEquals(2, l.size());
600	>	assertTrue(l.contains(one));
601	>	assertTrue(l.contains(two));
602	>	awaitTermination(t1);
603	>	awaitTermination(t2);
604	>	}
605	>
606	>	/**
607	>	* remove(null), contains(null) always return false
608	>	*/
609	>	public void testNeverContainsNull() {
610	>	Collection<?> q = new SynchronousQueue();
611	>	assertFalse(q.contains(null));
612	>	assertFalse(q.remove(null));
613		}
614
615		}

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