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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 1.65 by jsr166, Tue Aug 13 23:06:39 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	>
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 IllegalStateException 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	>	if (randomBoolean()) 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;
160	<	q.put(new Object());
161	<	++added;
162	<	q.put(new Object());
163	<	++added;
164	<	threadShouldThrow();
165	<	} catch (InterruptedException e){
166	<	assertTrue(added >= 1);
167	<	}
168	<	}
169	<	});
170	<	try {
171	<	t.start();
172	<	Thread.sleep(SHORT_DELAY_MS);
173	<	q.take();
174	<	Thread.sleep(SHORT_DELAY_MS);
175	<	t.interrupt();
176	<	t.join();
177	<	} catch (Exception e){
178	<	unexpectedException();
179	<	}
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	>	Thread.currentThread().interrupt();
162	>	try {
163	>	q.put(99);
164	>	shouldThrow();
165	>	} catch (InterruptedException success) {}
166	>	assertFalse(Thread.interrupted());
167	>
168	>	pleaseInterrupt.countDown();
169	>	try {
170	>	q.put(99);
171	>	shouldThrow();
172	>	} catch (InterruptedException success) {}
173	>	assertFalse(Thread.interrupted());
174	>	}});
175	>
176	>	await(pleaseTake);
177	>	assertEquals(0, q.remainingCapacity());
178	>	try { assertSame(one, q.take()); }
179	>	catch (InterruptedException e) { threadUnexpectedException(e); }
180	>
181	>	await(pleaseInterrupt);
182	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
183	>	t.interrupt();
184	>	awaitTermination(t);
185	>	assertEquals(0, q.remainingCapacity());
186		}
187
188		/**
189	<	*
189	>	* timed offer times out if elements not taken
190		*/
191		public void testTimedOffer() {
192	<	final SynchronousQueue q = new SynchronousQueue();
193	<	Thread t = new Thread(new Runnable() {
194	<	public void run() {
195	<	try {
196	<
197	<	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	<	}
192	>	final boolean fair = randomBoolean();
193	>	final SynchronousQueue q = new SynchronousQueue(fair);
194	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
195	>	Thread t = newStartedThread(new CheckedRunnable() {
196	>	public void realRun() throws InterruptedException {
197	>	long startTime = System.nanoTime();
198
199	+	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
200	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
201
202	<	/**
203	<	*
204	<	*/
205	<	public void testTakeFromEmpty() {
206	<	final SynchronousQueue q = new SynchronousQueue();
207	<	Thread t = new Thread(new Runnable() {
208	<	public void run() {
209	<	try {
210	<	q.take();
211	<	threadShouldThrow();
212	<	} catch (InterruptedException success){ }
213	<	}
214	<	});
215	<	try {
216	<	t.start();
217	<	Thread.sleep(SHORT_DELAY_MS);
218	<	t.interrupt();
219	<	t.join();
220	<	} catch (Exception e){
221	<	unexpectedException();
222	<	}
202	>	Thread.currentThread().interrupt();
203	>	try {
204	>	q.offer(new Object(), randomTimeout(), randomTimeUnit());
205	>	shouldThrow();
206	>	} catch (InterruptedException success) {}
207	>	assertFalse(Thread.interrupted());
208	>
209	>	pleaseInterrupt.countDown();
210	>	try {
211	>	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
212	>	shouldThrow();
213	>	} catch (InterruptedException success) {}
214	>	assertFalse(Thread.interrupted());
215	>
216	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
217	>	}});
218	>
219	>	await(pleaseInterrupt);
220	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
221	>	t.interrupt();
222	>	awaitTermination(t);
223		}
224
225		/**
226	<	*
226	>	* poll return null if no active putter
227		*/
228	<	public void testPoll() {
229	<	SynchronousQueue q = new SynchronousQueue();
230	<	assertNull(q.poll());
228	>	public void testPoll()      { testPoll(false); }
229	>	public void testPoll_fair() { testPoll(true); }
230	>	public void testPoll(boolean fair) {
231	>	final SynchronousQueue q = new SynchronousQueue(fair);
232	>	assertNull(q.poll());
233		}
234
235		/**
236	<	*
236	>	* timed poll with zero timeout times out if no active putter
237		*/
238	<	public void testTimedPoll0() {
239	<	try {
240	<	SynchronousQueue q = new SynchronousQueue();
241	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
242	<	} catch (InterruptedException e){
243	<	unexpectedException();
245	<	}
238	>	public void testTimedPoll0()      { testTimedPoll0(false); }
239	>	public void testTimedPoll0_fair() { testTimedPoll0(true); }
240	>	public void testTimedPoll0(boolean fair) {
241	>	final SynchronousQueue q = new SynchronousQueue(fair);
242	>	try { assertNull(q.poll(0, MILLISECONDS)); }
243	>	catch (InterruptedException e) { threadUnexpectedException(e); }
244		}
245
246		/**
247	<	*
247	>	* timed poll with nonzero timeout times out if no active putter
248		*/
249		public void testTimedPoll() {
250	<	try {
251	<	SynchronousQueue q = new SynchronousQueue();
252	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
253	<	} catch (InterruptedException e){
254	<	unexpectedException();
255	<	}
250	>	final boolean fair = randomBoolean();
251	>	final SynchronousQueue q = new SynchronousQueue(fair);
252	>	final long startTime = System.nanoTime();
253	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
254	>	catch (InterruptedException e) { threadUnexpectedException(e); }
255	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
256		}
257
258		/**
259	<	*
260	<	*/
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	<	*
259	>	* timed poll before a delayed offer times out, returning null;
260	>	* after offer succeeds; on interruption throws
261		*/
262		public void testTimedPollWithOffer() {
263	<	final SynchronousQueue q = new SynchronousQueue();
264	<	Thread t = new Thread(new Runnable() {
265	<	public void run() {
266	<	try {
267	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
268	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
269	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
270	<	threadShouldThrow();
271	<	} catch (InterruptedException success) { }
272	<	}
273	<	});
274	<	try {
275	<	t.start();
276	<	Thread.sleep(SMALL_DELAY_MS);
277	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
278	<	t.interrupt();
279	<	t.join();
280	<	} catch (Exception e){
281	<	unexpectedException();
282	<	}
283	<	}
263	>	final boolean fair = randomBoolean();
264	>	final SynchronousQueue q = new SynchronousQueue(fair);
265	>	final CountDownLatch pleaseOffer = new CountDownLatch(1);
266	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
267	>	Thread t = newStartedThread(new CheckedRunnable() {
268	>	public void realRun() throws InterruptedException {
269	>	long startTime = System.nanoTime();
270	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
271	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
272	>
273	>	pleaseOffer.countDown();
274	>	startTime = System.nanoTime();
275	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
276	>
277	>	Thread.currentThread().interrupt();
278	>	try {
279	>	q.poll(randomTimeout(), randomTimeUnit());
280	>	shouldThrow();
281	>	} catch (InterruptedException success) {}
282	>	assertFalse(Thread.interrupted());
283	>
284	>	pleaseInterrupt.countDown();
285	>	try {
286	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
287	>	shouldThrow();
288	>	} catch (InterruptedException success) {}
289	>	assertFalse(Thread.interrupted());
290	>
291	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
292	>	}});
293
294	+	await(pleaseOffer);
295	+	long startTime = System.nanoTime();
296	+	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
297	+	catch (InterruptedException e) { threadUnexpectedException(e); }
298	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
299	+
300	+	await(pleaseInterrupt);
301	+	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
302	+	t.interrupt();
303	+	awaitTermination(t);
304	+	}
305
306		/**
307	<	*
307	>	* peek() returns null if no active putter
308		*/
309	<	public void testPeek() {
310	<	SynchronousQueue q = new SynchronousQueue();
311	<	assertNull(q.peek());
309	>	public void testPeek()      { testPeek(false); }
310	>	public void testPeek_fair() { testPeek(true); }
311	>	public void testPeek(boolean fair) {
312	>	final SynchronousQueue q = new SynchronousQueue(fair);
313	>	assertNull(q.peek());
314		}
315
316		/**
317	<	*
317	>	* element() throws NoSuchElementException if no active putter
318		*/
319	<	public void testElement() {
320	<	SynchronousQueue q = new SynchronousQueue();
319	>	public void testElement()      { testElement(false); }
320	>	public void testElement_fair() { testElement(true); }
321	>	public void testElement(boolean fair) {
322	>	final SynchronousQueue q = new SynchronousQueue(fair);
323		try {
324		q.element();
325		shouldThrow();
326	<	}
327	<	catch (NoSuchElementException success) {}
326	>	} catch (NoSuchElementException success) {}
327		}
328
329		/**
330	<	*
330	>	* remove() throws NoSuchElementException if no active putter
331		*/
332	<	public void testRemove() {
333	<	SynchronousQueue q = new SynchronousQueue();
332	>	public void testRemove()      { testRemove(false); }
333	>	public void testRemove_fair() { testRemove(true); }
334	>	public void testRemove(boolean fair) {
335	>	final SynchronousQueue q = new SynchronousQueue(fair);
336		try {
337		q.remove();
338		shouldThrow();
339	<	} catch (NoSuchElementException success){
339	<	}
339	>	} catch (NoSuchElementException success) {}
340		}
341
342		/**
343	<	*
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	<	*
343	>	* contains returns false
344		*/
345	<	public void testContains() {
346	<	SynchronousQueue q = new SynchronousQueue();
347	<	assertFalse(q.contains(new Integer(0)));
345	>	public void testContains()      { testContains(false); }
346	>	public void testContains_fair() { testContains(true); }
347	>	public void testContains(boolean fair) {
348	>	final SynchronousQueue q = new SynchronousQueue(fair);
349	>	assertFalse(q.contains(zero));
350		}
351
352		/**
353	<	*
353	>	* clear ensures isEmpty
354		*/
355	<	public void testClear() {
356	<	SynchronousQueue q = new SynchronousQueue();
355	>	public void testClear()      { testClear(false); }
356	>	public void testClear_fair() { testClear(true); }
357	>	public void testClear(boolean fair) {
358	>	final SynchronousQueue q = new SynchronousQueue(fair);
359		q.clear();
360		assertTrue(q.isEmpty());
361		}
362
363		/**
364	<	*
364	>	* containsAll returns false unless empty
365		*/
366	<	public void testContainsAll() {
367	<	SynchronousQueue q = new SynchronousQueue();
366	>	public void testContainsAll()      { testContainsAll(false); }
367	>	public void testContainsAll_fair() { testContainsAll(true); }
368	>	public void testContainsAll(boolean fair) {
369	>	final SynchronousQueue q = new SynchronousQueue(fair);
370		Integer[] empty = new Integer[0];
371	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
371	>	assertTrue(q.containsAll(Arrays.asList(empty)));
372	>	Integer[] ints = new Integer[1]; ints[0] = zero;
373		assertFalse(q.containsAll(Arrays.asList(ints)));
374		}
375
376		/**
377	<	*
377	>	* retainAll returns false
378		*/
379	<	public void testRetainAll() {
380	<	SynchronousQueue q = new SynchronousQueue();
379	>	public void testRetainAll()      { testRetainAll(false); }
380	>	public void testRetainAll_fair() { testRetainAll(true); }
381	>	public void testRetainAll(boolean fair) {
382	>	final SynchronousQueue q = new SynchronousQueue(fair);
383		Integer[] empty = new Integer[0];
384	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
385	<	q.retainAll(Arrays.asList(ints));
386	<	assertFalse(q.containsAll(Arrays.asList(ints)));
384	>	assertFalse(q.retainAll(Arrays.asList(empty)));
385	>	Integer[] ints = new Integer[1]; ints[0] = zero;
386	>	assertFalse(q.retainAll(Arrays.asList(ints)));
387		}
388
389		/**
390	<	*
390	>	* removeAll returns false
391		*/
392	<	public void testRemoveAll() {
393	<	SynchronousQueue q = new SynchronousQueue();
392	>	public void testRemoveAll()      { testRemoveAll(false); }
393	>	public void testRemoveAll_fair() { testRemoveAll(true); }
394	>	public void testRemoveAll(boolean fair) {
395	>	final SynchronousQueue q = new SynchronousQueue(fair);
396		Integer[] empty = new Integer[0];
397	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
398	<	q.removeAll(Arrays.asList(ints));
397	>	assertFalse(q.removeAll(Arrays.asList(empty)));
398	>	Integer[] ints = new Integer[1]; ints[0] = zero;
399		assertFalse(q.containsAll(Arrays.asList(ints)));
400		}
401
400	–
402		/**
403	<	*
403	>	* toArray is empty
404		*/
405	<	public void testToArray() {
406	<	SynchronousQueue q = new SynchronousQueue();
407	<	Object[] o = q.toArray();
408	<	assertEquals(o.length, 0);
405	>	public void testToArray()      { testToArray(false); }
406	>	public void testToArray_fair() { testToArray(true); }
407	>	public void testToArray(boolean fair) {
408	>	final SynchronousQueue q = new SynchronousQueue(fair);
409	>	Object[] o = q.toArray();
410	>	assertEquals(0, o.length);
411		}
412
413		/**
414	<	*
414	>	* toArray(Integer array) returns its argument with the first
415	>	* element (if present) nulled out
416		*/
417	<	public void testToArray2() {
418	<	SynchronousQueue q = new SynchronousQueue();
419	<	Integer[] ints = new Integer[1];
420	<	assertNull(ints[0]);
417	>	public void testToArray2()      { testToArray2(false); }
418	>	public void testToArray2_fair() { testToArray2(true); }
419	>	public void testToArray2(boolean fair) {
420	>	final SynchronousQueue<Integer> q = new SynchronousQueue<>(fair);
421	>	Integer[] a;
422	>
423	>	a = new Integer[0];
424	>	assertSame(a, q.toArray(a));
425	>
426	>	a = new Integer[3];
427	>	Arrays.fill(a, 42);
428	>	assertSame(a, q.toArray(a));
429	>	assertNull(a[0]);
430	>	for (int i = 1; i < a.length; i++)
431	>	assertEquals(42, (int) a[i]);
432		}
433	<
433	>
434		/**
435	<	*
435	>	* toArray(null) throws NPE
436		*/
437	<	public void testIterator() {
438	<	SynchronousQueue q = new SynchronousQueue();
439	<	Iterator it = q.iterator();
440	<	assertFalse(it.hasNext());
437	>	public void testToArray_null()      { testToArray_null(false); }
438	>	public void testToArray_null_fair() { testToArray_null(true); }
439	>	public void testToArray_null(boolean fair) {
440	>	final SynchronousQueue q = new SynchronousQueue(fair);
441		try {
442	<	Object x = it.next();
442	>	Object[] o = q.toArray((Object[])null);
443		shouldThrow();
444	<	}
445	<	catch (NoSuchElementException success) {}
444	>	} catch (NullPointerException success) {}
445	>	}
446	>
447	>	/**
448	>	* iterator does not traverse any elements
449	>	*/
450	>	public void testIterator()      { testIterator(false); }
451	>	public void testIterator_fair() { testIterator(true); }
452	>	public void testIterator(boolean fair) {
453	>	assertIteratorExhausted(new SynchronousQueue(fair).iterator());
454		}
455
456		/**
457	<	*
457	>	* iterator remove throws IllegalStateException
458		*/
459	<	public void testIteratorRemove() {
460	<	SynchronousQueue q = new SynchronousQueue();
461	<	Iterator it = q.iterator();
459	>	public void testIteratorRemove()      { testIteratorRemove(false); }
460	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
461	>	public void testIteratorRemove(boolean fair) {
462	>	final SynchronousQueue q = new SynchronousQueue(fair);
463	>	Iterator it = q.iterator();
464		try {
465		it.remove();
466		shouldThrow();
467	<	}
443	<	catch (IllegalStateException success) {}
467	>	} catch (IllegalStateException success) {}
468		}
469
470		/**
471	<	*
471	>	* toString returns a non-null string
472		*/
473	<	public void testToString() {
474	<	SynchronousQueue q = new SynchronousQueue();
473	>	public void testToString()      { testToString(false); }
474	>	public void testToString_fair() { testToString(true); }
475	>	public void testToString(boolean fair) {
476	>	final SynchronousQueue q = new SynchronousQueue(fair);
477		String s = q.toString();
478	<	assertTrue(s != null);
479	<	}
454	<
478	>	assertNotNull(s);
479	>	}
480
481		/**
482	<	*
482	>	* offer transfers elements across Executor tasks
483		*/
484	<	public void testOfferInExecutor() {
485	<	final SynchronousQueue q = new SynchronousQueue();
486	<	ExecutorService executor = Executors.newFixedThreadPool(2);
487	<	final Integer one = new Integer(1);
488	<
489	<	executor.execute(new Runnable() {
490	<	public void run() {
491	<	threadAssertFalse(q.offer(one));
492	<	try {
493	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
494	<	threadAssertEquals(0, q.remainingCapacity());
495	<	}
496	<	catch (InterruptedException e) {
497	<	threadUnexpectedException();
498	<	}
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);
484	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
485	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
486	>	public void testOfferInExecutor(boolean fair) {
487	>	final SynchronousQueue q = new SynchronousQueue(fair);
488	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
489	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
490	>	try (PoolCleaner cleaner = cleaner(executor)) {
491	>
492	>	executor.execute(new CheckedRunnable() {
493	>	public void realRun() throws InterruptedException {
494	>	assertFalse(q.offer(one));
495	>	threadsStarted.await();
496	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
497	>	assertEquals(0, q.remainingCapacity());
498	>	}});
499
500	+	executor.execute(new CheckedRunnable() {
501	+	public void realRun() throws InterruptedException {
502	+	threadsStarted.await();
503	+	assertSame(one, q.take());
504	+	}});
505	+	}
506		}
507
508		/**
509	<	*
509	>	* timed poll retrieves elements across Executor threads
510		*/
511	<	public void testPollInExecutor() {
511	>	public void testPollInExecutor()      { testPollInExecutor(false); }
512	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
513	>	public void testPollInExecutor(boolean fair) {
514	>	final SynchronousQueue q = new SynchronousQueue(fair);
515	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
516	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
517	>	try (PoolCleaner cleaner = cleaner(executor)) {
518	>	executor.execute(new CheckedRunnable() {
519	>	public void realRun() throws InterruptedException {
520	>	assertNull(q.poll());
521	>	threadsStarted.await();
522	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
523	>	assertTrue(q.isEmpty());
524	>	}});
525
526	<	final SynchronousQueue q = new SynchronousQueue();
526	>	executor.execute(new CheckedRunnable() {
527	>	public void realRun() throws InterruptedException {
528	>	threadsStarted.await();
529	>	q.put(one);
530	>	}});
531	>	}
532	>	}
533
534	<	ExecutorService executor = Executors.newFixedThreadPool(2);
534	>	/**
535	>	* a deserialized/reserialized queue is usable
536	>	*/
537	>	public void testSerialization() {
538	>	final SynchronousQueue x = new SynchronousQueue();
539	>	final SynchronousQueue y = new SynchronousQueue(false);
540	>	final SynchronousQueue z = new SynchronousQueue(true);
541	>	assertSerialEquals(x, y);
542	>	assertNotSerialEquals(x, z);
543	>	SynchronousQueue[] qs = { x, y, z };
544	>	for (SynchronousQueue q : qs) {
545	>	SynchronousQueue clone = serialClone(q);
546	>	assertNotSame(q, clone);
547	>	assertSerialEquals(q, clone);
548	>	assertTrue(clone.isEmpty());
549	>	assertEquals(0, clone.size());
550	>	assertEquals(0, clone.remainingCapacity());
551	>	assertFalse(clone.offer(zero));
552	>	}
553	>	}
554
555	<	executor.execute(new Runnable() {
556	<	public void run() {
557	<	threadAssertNull(q.poll());
558	<	try {
559	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
560	<	threadAssertTrue(q.isEmpty());
561	<	}
562	<	catch (InterruptedException e) {
563	<	threadUnexpectedException();
564	<	}
565	<	}
566	<	});
555	>	/**
556	>	* drainTo(c) of empty queue doesn't transfer elements
557	>	*/
558	>	public void testDrainTo()      { testDrainTo(false); }
559	>	public void testDrainTo_fair() { testDrainTo(true); }
560	>	public void testDrainTo(boolean fair) {
561	>	final SynchronousQueue q = new SynchronousQueue(fair);
562	>	ArrayList l = new ArrayList();
563	>	q.drainTo(l);
564	>	assertEquals(0, q.size());
565	>	assertEquals(0, l.size());
566	>	}
567
568	<	executor.execute(new Runnable() {
569	<	public void run() {
570	<	try {
571	<	Thread.sleep(SMALL_DELAY_MS);
572	<	q.put(new Integer(1));
573	<	}
574	<	catch (InterruptedException e) {
575	<	threadUnexpectedException();
576	<	}
577	<	}
578	<	});
526	<
527	<	joinPool(executor);
568	>	/**
569	>	* drainTo empties queue, unblocking a waiting put.
570	>	*/
571	>	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
572	>	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
573	>	public void testDrainToWithActivePut(boolean fair) {
574	>	final SynchronousQueue q = new SynchronousQueue(fair);
575	>	Thread t = newStartedThread(new CheckedRunnable() {
576	>	public void realRun() throws InterruptedException {
577	>	q.put(one);
578	>	}});
579
580	+	ArrayList l = new ArrayList();
581	+	long startTime = System.nanoTime();
582	+	while (l.isEmpty()) {
583	+	q.drainTo(l);
584	+	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
585	+	fail("timed out");
586	+	Thread.yield();
587	+	}
588	+	assertEquals(1, l.size());
589	+	assertSame(one, l.get(0));
590	+	awaitTermination(t);
591		}
592
593		/**
594	<	*
594	>	* drainTo(c, n) empties up to n elements of queue into c
595		*/
596	<	public void testSerialization() {
597	<	SynchronousQueue q = new SynchronousQueue();
598	<	try {
599	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
600	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
601	<	out.writeObject(q);
602	<	out.close();
603	<
604	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
605	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
606	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
607	<	assertEquals(q.size(), r.size());
608	<	while (!q.isEmpty())
609	<	assertEquals(q.remove(), r.remove());
610	<	} catch(Exception e){
611	<	unexpectedException();
612	<	}
596	>	public void testDrainToN() throws InterruptedException {
597	>	final SynchronousQueue q = new SynchronousQueue();
598	>	Thread t1 = newStartedThread(new CheckedRunnable() {
599	>	public void realRun() throws InterruptedException {
600	>	q.put(one);
601	>	}});
602	>
603	>	Thread t2 = newStartedThread(new CheckedRunnable() {
604	>	public void realRun() throws InterruptedException {
605	>	q.put(two);
606	>	}});
607	>
608	>	ArrayList l = new ArrayList();
609	>	int drained;
610	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
611	>	assertEquals(1, drained);
612	>	assertEquals(1, l.size());
613	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
614	>	assertEquals(1, drained);
615	>	assertEquals(2, l.size());
616	>	assertTrue(l.contains(one));
617	>	assertTrue(l.contains(two));
618	>	awaitTermination(t1);
619	>	awaitTermination(t2);
620	>	}
621	>
622	>	/**
623	>	* remove(null), contains(null) always return false
624	>	*/
625	>	public void testNeverContainsNull() {
626	>	Collection<?> q = new SynchronousQueue();
627	>	assertFalse(q.contains(null));
628	>	assertFalse(q.remove(null));
629		}
630
631		}

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