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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 1.56 by jsr166, Sun May 14 00:56:43 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	>	assertThreadBlocks(t, Thread.State.WAITING);
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	>	assertThreadBlocks(t, Thread.State.WAITING);
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	>	assertFalse(Thread.interrupted());
200	>	}});
201	>
202	>	await(pleaseInterrupt);
203	>	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
204	>	t.interrupt();
205	>	awaitTermination(t);
206		}
207
208		/**
209	<	*
209	>	* poll return null if no active putter
210		*/
211	<	public void testTimedPoll0() {
212	<	try {
213	<	SynchronousQueue q = new SynchronousQueue();
214	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
215	<	} catch (InterruptedException e){
244	<	unexpectedException();
245	<	}
211	>	public void testPoll()      { testPoll(false); }
212	>	public void testPoll_fair() { testPoll(true); }
213	>	public void testPoll(boolean fair) {
214	>	final SynchronousQueue q = new SynchronousQueue(fair);
215	>	assertNull(q.poll());
216		}
217
218		/**
219	<	*
219	>	* timed poll with zero timeout times out if no active putter
220		*/
221	<	public void testTimedPoll() {
222	<	try {
223	<	SynchronousQueue q = new SynchronousQueue();
224	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
225	<	} catch (InterruptedException e){
226	<	unexpectedException();
257	<	}
221	>	public void testTimedPoll0()      { testTimedPoll0(false); }
222	>	public void testTimedPoll0_fair() { testTimedPoll0(true); }
223	>	public void testTimedPoll0(boolean fair) {
224	>	final SynchronousQueue q = new SynchronousQueue(fair);
225	>	try { assertNull(q.poll(0, MILLISECONDS)); }
226	>	catch (InterruptedException e) { threadUnexpectedException(e); }
227		}
228
229		/**
230	<	*
231	<	*/
232	<	public void testInterruptedTimedPoll() {
233	<	Thread t = new Thread(new Runnable() {
234	<	public void run() {
235	<	try {
236	<	SynchronousQueue q = new SynchronousQueue();
237	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
238	<	} catch (InterruptedException success){
239	<	}
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	<	}
230	>	* timed poll with nonzero timeout times out if no active putter
231	>	*/
232	>	public void testTimedPoll()      { testTimedPoll(false); }
233	>	public void testTimedPoll_fair() { testTimedPoll(true); }
234	>	public void testTimedPoll(boolean fair) {
235	>	final SynchronousQueue q = new SynchronousQueue(fair);
236	>	long startTime = System.nanoTime();
237	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
238	>	catch (InterruptedException e) { threadUnexpectedException(e); }
239	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
240		}
241
242		/**
243	<	*
243	>	* timed poll before a delayed offer times out, returning null;
244	>	* after offer succeeds; on interruption throws
245		*/
246	<	public void testTimedPollWithOffer() {
247	<	final SynchronousQueue q = new SynchronousQueue();
248	<	Thread t = new Thread(new Runnable() {
249	<	public void run() {
250	<	try {
251	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
252	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
253	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
254	<	threadShouldThrow();
255	<	} catch (InterruptedException success) { }
256	<	}
257	<	});
258	<	try {
259	<	t.start();
260	<	Thread.sleep(SMALL_DELAY_MS);
261	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
262	<	t.interrupt();
263	<	t.join();
264	<	} catch (Exception e){
265	<	unexpectedException();
266	<	}
267	<	}
246	>	public void testTimedPollWithOffer()      { testTimedPollWithOffer(false); }
247	>	public void testTimedPollWithOffer_fair() { testTimedPollWithOffer(true); }
248	>	public void testTimedPollWithOffer(boolean fair) {
249	>	final SynchronousQueue q = new SynchronousQueue(fair);
250	>	final CountDownLatch pleaseOffer = new CountDownLatch(1);
251	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
252	>	Thread t = newStartedThread(new CheckedRunnable() {
253	>	public void realRun() throws InterruptedException {
254	>	long startTime = System.nanoTime();
255	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
256	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
257	>
258	>	pleaseOffer.countDown();
259	>	startTime = System.nanoTime();
260	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
261	>
262	>	Thread.currentThread().interrupt();
263	>	try {
264	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
265	>	shouldThrow();
266	>	} catch (InterruptedException success) {}
267	>	assertFalse(Thread.interrupted());
268
269	+	pleaseInterrupt.countDown();
270	+	try {
271	+	q.poll(LONG_DELAY_MS, MILLISECONDS);
272	+	shouldThrow();
273	+	} catch (InterruptedException success) {}
274	+	assertFalse(Thread.interrupted());
275	+
276	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
277	+	}});
278	+
279	+	await(pleaseOffer);
280	+	long startTime = System.nanoTime();
281	+	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
282	+	catch (InterruptedException e) { threadUnexpectedException(e); }
283	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
284	+
285	+	await(pleaseInterrupt);
286	+	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
287	+	t.interrupt();
288	+	awaitTermination(t);
289	+	}
290
291		/**
292	<	*
292	>	* peek() returns null if no active putter
293		*/
294	<	public void testPeek() {
295	<	SynchronousQueue q = new SynchronousQueue();
296	<	assertNull(q.peek());
294	>	public void testPeek()      { testPeek(false); }
295	>	public void testPeek_fair() { testPeek(true); }
296	>	public void testPeek(boolean fair) {
297	>	final SynchronousQueue q = new SynchronousQueue(fair);
298	>	assertNull(q.peek());
299		}
300
301		/**
302	<	*
302	>	* element() throws NoSuchElementException if no active putter
303		*/
304	<	public void testElement() {
305	<	SynchronousQueue q = new SynchronousQueue();
304	>	public void testElement()      { testElement(false); }
305	>	public void testElement_fair() { testElement(true); }
306	>	public void testElement(boolean fair) {
307	>	final SynchronousQueue q = new SynchronousQueue(fair);
308		try {
309		q.element();
310		shouldThrow();
311	<	}
327	<	catch (NoSuchElementException success) {}
311	>	} catch (NoSuchElementException success) {}
312		}
313
314		/**
315	<	*
315	>	* remove() throws NoSuchElementException if no active putter
316		*/
317	<	public void testRemove() {
318	<	SynchronousQueue q = new SynchronousQueue();
317	>	public void testRemove()      { testRemove(false); }
318	>	public void testRemove_fair() { testRemove(true); }
319	>	public void testRemove(boolean fair) {
320	>	final SynchronousQueue q = new SynchronousQueue(fair);
321		try {
322		q.remove();
323		shouldThrow();
324	<	} catch (NoSuchElementException success){
339	<	}
324	>	} catch (NoSuchElementException success) {}
325		}
326
327		/**
328	<	*
328	>	* contains returns false
329		*/
330	<	public void testRemoveElement() {
331	<	SynchronousQueue q = new SynchronousQueue();
332	<	assertFalse(q.remove(new Integer(0)));
333	<	assertTrue(q.isEmpty());
334	<	}
350	<
351	<	/**
352	<	*
353	<	*/
354	<	public void testContains() {
355	<	SynchronousQueue q = new SynchronousQueue();
356	<	assertFalse(q.contains(new Integer(0)));
330	>	public void testContains()      { testContains(false); }
331	>	public void testContains_fair() { testContains(true); }
332	>	public void testContains(boolean fair) {
333	>	final SynchronousQueue q = new SynchronousQueue(fair);
334	>	assertFalse(q.contains(zero));
335		}
336
337		/**
338	<	*
338	>	* clear ensures isEmpty
339		*/
340	<	public void testClear() {
341	<	SynchronousQueue q = new SynchronousQueue();
340	>	public void testClear()      { testClear(false); }
341	>	public void testClear_fair() { testClear(true); }
342	>	public void testClear(boolean fair) {
343	>	final SynchronousQueue q = new SynchronousQueue(fair);
344		q.clear();
345		assertTrue(q.isEmpty());
346		}
347
348		/**
349	<	*
349	>	* containsAll returns false unless empty
350		*/
351	<	public void testContainsAll() {
352	<	SynchronousQueue q = new SynchronousQueue();
351	>	public void testContainsAll()      { testContainsAll(false); }
352	>	public void testContainsAll_fair() { testContainsAll(true); }
353	>	public void testContainsAll(boolean fair) {
354	>	final SynchronousQueue q = new SynchronousQueue(fair);
355		Integer[] empty = new Integer[0];
356	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
356	>	assertTrue(q.containsAll(Arrays.asList(empty)));
357	>	Integer[] ints = new Integer[1]; ints[0] = zero;
358		assertFalse(q.containsAll(Arrays.asList(ints)));
359		}
360
361		/**
362	<	*
362	>	* retainAll returns false
363		*/
364	<	public void testRetainAll() {
365	<	SynchronousQueue q = new SynchronousQueue();
364	>	public void testRetainAll()      { testRetainAll(false); }
365	>	public void testRetainAll_fair() { testRetainAll(true); }
366	>	public void testRetainAll(boolean fair) {
367	>	final SynchronousQueue q = new SynchronousQueue(fair);
368		Integer[] empty = new Integer[0];
369	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
370	<	q.retainAll(Arrays.asList(ints));
371	<	assertFalse(q.containsAll(Arrays.asList(ints)));
369	>	assertFalse(q.retainAll(Arrays.asList(empty)));
370	>	Integer[] ints = new Integer[1]; ints[0] = zero;
371	>	assertFalse(q.retainAll(Arrays.asList(ints)));
372		}
373
374		/**
375	<	*
375	>	* removeAll returns false
376		*/
377	<	public void testRemoveAll() {
378	<	SynchronousQueue q = new SynchronousQueue();
377	>	public void testRemoveAll()      { testRemoveAll(false); }
378	>	public void testRemoveAll_fair() { testRemoveAll(true); }
379	>	public void testRemoveAll(boolean fair) {
380	>	final SynchronousQueue q = new SynchronousQueue(fair);
381		Integer[] empty = new Integer[0];
382	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
383	<	q.removeAll(Arrays.asList(ints));
382	>	assertFalse(q.removeAll(Arrays.asList(empty)));
383	>	Integer[] ints = new Integer[1]; ints[0] = zero;
384		assertFalse(q.containsAll(Arrays.asList(ints)));
385		}
386
400	–
387		/**
388	<	*
388	>	* toArray is empty
389		*/
390	<	public void testToArray() {
391	<	SynchronousQueue q = new SynchronousQueue();
392	<	Object[] o = q.toArray();
393	<	assertEquals(o.length, 0);
390	>	public void testToArray()      { testToArray(false); }
391	>	public void testToArray_fair() { testToArray(true); }
392	>	public void testToArray(boolean fair) {
393	>	final SynchronousQueue q = new SynchronousQueue(fair);
394	>	Object[] o = q.toArray();
395	>	assertEquals(0, o.length);
396		}
397
398		/**
399	<	*
399	>	* toArray(Integer array) returns its argument with the first
400	>	* element (if present) nulled out
401		*/
402	<	public void testToArray2() {
403	<	SynchronousQueue q = new SynchronousQueue();
404	<	Integer[] ints = new Integer[1];
405	<	assertNull(ints[0]);
402	>	public void testToArray2()      { testToArray2(false); }
403	>	public void testToArray2_fair() { testToArray2(true); }
404	>	public void testToArray2(boolean fair) {
405	>	final SynchronousQueue<Integer> q = new SynchronousQueue<>(fair);
406	>	Integer[] a;
407	>
408	>	a = new Integer[0];
409	>	assertSame(a, q.toArray(a));
410	>
411	>	a = new Integer[3];
412	>	Arrays.fill(a, 42);
413	>	assertSame(a, q.toArray(a));
414	>	assertNull(a[0]);
415	>	for (int i = 1; i < a.length; i++)
416	>	assertEquals(42, (int) a[i]);
417		}
418	<
418	>
419		/**
420	<	*
420	>	* toArray(null) throws NPE
421		*/
422	<	public void testIterator() {
423	<	SynchronousQueue q = new SynchronousQueue();
424	<	Iterator it = q.iterator();
425	<	assertFalse(it.hasNext());
422	>	public void testToArray_null()      { testToArray_null(false); }
423	>	public void testToArray_null_fair() { testToArray_null(true); }
424	>	public void testToArray_null(boolean fair) {
425	>	final SynchronousQueue q = new SynchronousQueue(fair);
426		try {
427	<	Object x = it.next();
427	>	Object[] o = q.toArray(null);
428		shouldThrow();
429	<	}
430	<	catch (NoSuchElementException success) {}
429	>	} catch (NullPointerException success) {}
430		}
431
432		/**
433	<	*
433	>	* iterator does not traverse any elements
434		*/
435	<	public void testIteratorRemove() {
436	<	SynchronousQueue q = new SynchronousQueue();
437	<	Iterator it = q.iterator();
435	>	public void testIterator()      { testIterator(false); }
436	>	public void testIterator_fair() { testIterator(true); }
437	>	public void testIterator(boolean fair) {
438	>	assertIteratorExhausted(new SynchronousQueue(fair).iterator());
439	>	}
440	>
441	>	/**
442	>	* iterator remove throws ISE
443	>	*/
444	>	public void testIteratorRemove()      { testIteratorRemove(false); }
445	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
446	>	public void testIteratorRemove(boolean fair) {
447	>	final SynchronousQueue q = new SynchronousQueue(fair);
448	>	Iterator it = q.iterator();
449		try {
450		it.remove();
451		shouldThrow();
452	<	}
443	<	catch (IllegalStateException success) {}
452	>	} catch (IllegalStateException success) {}
453		}
454
455		/**
456	<	*
456	>	* toString returns a non-null string
457		*/
458	<	public void testToString() {
459	<	SynchronousQueue q = new SynchronousQueue();
458	>	public void testToString()      { testToString(false); }
459	>	public void testToString_fair() { testToString(true); }
460	>	public void testToString(boolean fair) {
461	>	final SynchronousQueue q = new SynchronousQueue(fair);
462		String s = q.toString();
463	<	assertTrue(s != null);
464	<	}
454	<
463	>	assertNotNull(s);
464	>	}
465
466		/**
467	<	*
467	>	* offer transfers elements across Executor tasks
468		*/
469	<	public void testOfferInExecutor() {
470	<	final SynchronousQueue q = new SynchronousQueue();
471	<	ExecutorService executor = Executors.newFixedThreadPool(2);
472	<	final Integer one = new Integer(1);
473	<
474	<	executor.execute(new Runnable() {
475	<	public void run() {
476	<	threadAssertFalse(q.offer(one));
477	<	try {
478	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
479	<	threadAssertEquals(0, q.remainingCapacity());
480	<	}
481	<	catch (InterruptedException e) {
482	<	threadUnexpectedException();
483	<	}
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);
469	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
470	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
471	>	public void testOfferInExecutor(boolean fair) {
472	>	final SynchronousQueue q = new SynchronousQueue(fair);
473	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
474	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
475	>	try (PoolCleaner cleaner = cleaner(executor)) {
476	>
477	>	executor.execute(new CheckedRunnable() {
478	>	public void realRun() throws InterruptedException {
479	>	assertFalse(q.offer(one));
480	>	threadsStarted.await();
481	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
482	>	assertEquals(0, q.remainingCapacity());
483	>	}});
484
485	+	executor.execute(new CheckedRunnable() {
486	+	public void realRun() throws InterruptedException {
487	+	threadsStarted.await();
488	+	assertSame(one, q.take());
489	+	}});
490	+	}
491		}
492
493		/**
494	<	*
494	>	* timed poll retrieves elements across Executor threads
495		*/
496	<	public void testPollInExecutor() {
496	>	public void testPollInExecutor()      { testPollInExecutor(false); }
497	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
498	>	public void testPollInExecutor(boolean fair) {
499	>	final SynchronousQueue q = new SynchronousQueue(fair);
500	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
501	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
502	>	try (PoolCleaner cleaner = cleaner(executor)) {
503	>	executor.execute(new CheckedRunnable() {
504	>	public void realRun() throws InterruptedException {
505	>	assertNull(q.poll());
506	>	threadsStarted.await();
507	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
508	>	assertTrue(q.isEmpty());
509	>	}});
510
511	<	final SynchronousQueue q = new SynchronousQueue();
511	>	executor.execute(new CheckedRunnable() {
512	>	public void realRun() throws InterruptedException {
513	>	threadsStarted.await();
514	>	q.put(one);
515	>	}});
516	>	}
517	>	}
518
519	<	ExecutorService executor = Executors.newFixedThreadPool(2);
519	>	/**
520	>	* a deserialized serialized queue is usable
521	>	*/
522	>	public void testSerialization() {
523	>	final SynchronousQueue x = new SynchronousQueue();
524	>	final SynchronousQueue y = new SynchronousQueue(false);
525	>	final SynchronousQueue z = new SynchronousQueue(true);
526	>	assertSerialEquals(x, y);
527	>	assertNotSerialEquals(x, z);
528	>	SynchronousQueue[] qs = { x, y, z };
529	>	for (SynchronousQueue q : qs) {
530	>	SynchronousQueue clone = serialClone(q);
531	>	assertNotSame(q, clone);
532	>	assertSerialEquals(q, clone);
533	>	assertTrue(clone.isEmpty());
534	>	assertEquals(0, clone.size());
535	>	assertEquals(0, clone.remainingCapacity());
536	>	assertFalse(clone.offer(zero));
537	>	}
538	>	}
539
540	<	executor.execute(new Runnable() {
541	<	public void run() {
542	<	threadAssertNull(q.poll());
543	<	try {
544	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
545	<	threadAssertTrue(q.isEmpty());
546	<	}
547	<	catch (InterruptedException e) {
548	<	threadUnexpectedException();
549	<	}
550	<	}
551	<	});
540	>	/**
541	>	* drainTo(c) of empty queue doesn't transfer elements
542	>	*/
543	>	public void testDrainTo()      { testDrainTo(false); }
544	>	public void testDrainTo_fair() { testDrainTo(true); }
545	>	public void testDrainTo(boolean fair) {
546	>	final SynchronousQueue q = new SynchronousQueue(fair);
547	>	ArrayList l = new ArrayList();
548	>	q.drainTo(l);
549	>	assertEquals(0, q.size());
550	>	assertEquals(0, l.size());
551	>	}
552
553	<	executor.execute(new Runnable() {
554	<	public void run() {
555	<	try {
556	<	Thread.sleep(SMALL_DELAY_MS);
557	<	q.put(new Integer(1));
558	<	}
559	<	catch (InterruptedException e) {
560	<	threadUnexpectedException();
561	<	}
562	<	}
563	<	});
526	<
527	<	joinPool(executor);
553	>	/**
554	>	* drainTo empties queue, unblocking a waiting put.
555	>	*/
556	>	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
557	>	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
558	>	public void testDrainToWithActivePut(boolean fair) {
559	>	final SynchronousQueue q = new SynchronousQueue(fair);
560	>	Thread t = newStartedThread(new CheckedRunnable() {
561	>	public void realRun() throws InterruptedException {
562	>	q.put(one);
563	>	}});
564
565	+	ArrayList l = new ArrayList();
566	+	long startTime = System.nanoTime();
567	+	while (l.isEmpty()) {
568	+	q.drainTo(l);
569	+	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
570	+	fail("timed out");
571	+	Thread.yield();
572	+	}
573	+	assertEquals(1, l.size());
574	+	assertSame(one, l.get(0));
575	+	awaitTermination(t);
576		}
577
578		/**
579	<	*
579	>	* drainTo(c, n) empties up to n elements of queue into c
580		*/
581	<	public void testSerialization() {
582	<	SynchronousQueue q = new SynchronousQueue();
583	<	try {
584	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
585	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
586	<	out.writeObject(q);
587	<	out.close();
588	<
589	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
590	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
591	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
592	<	assertEquals(q.size(), r.size());
593	<	while (!q.isEmpty())
594	<	assertEquals(q.remove(), r.remove());
595	<	} catch(Exception e){
596	<	unexpectedException();
597	<	}
581	>	public void testDrainToN() throws InterruptedException {
582	>	final SynchronousQueue q = new SynchronousQueue();
583	>	Thread t1 = newStartedThread(new CheckedRunnable() {
584	>	public void realRun() throws InterruptedException {
585	>	q.put(one);
586	>	}});
587	>
588	>	Thread t2 = newStartedThread(new CheckedRunnable() {
589	>	public void realRun() throws InterruptedException {
590	>	q.put(two);
591	>	}});
592	>
593	>	ArrayList l = new ArrayList();
594	>	int drained;
595	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
596	>	assertEquals(1, drained);
597	>	assertEquals(1, l.size());
598	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
599	>	assertEquals(1, drained);
600	>	assertEquals(2, l.size());
601	>	assertTrue(l.contains(one));
602	>	assertTrue(l.contains(two));
603	>	awaitTermination(t1);
604	>	awaitTermination(t2);
605	>	}
606	>
607	>	/**
608	>	* remove(null), contains(null) always return false
609	>	*/
610	>	public void testNeverContainsNull() {
611	>	Collection<?> q = new SynchronousQueue();
612	>	assertFalse(q.contains(null));
613	>	assertFalse(q.remove(null));
614		}
615
616		}

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