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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 1.42 by jsr166, Sun Nov 23 22:27:06 2014 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.*;
10	>	import java.util.Arrays;
11	>	import java.util.ArrayList;
12	>	import java.util.Collection;
13	>	import java.util.Iterator;
14	>	import java.util.NoSuchElementException;
15	>	import java.util.Queue;
16	>	import java.util.concurrent.BlockingQueue;
17	>	import java.util.concurrent.CountDownLatch;
18	>	import java.util.concurrent.Executors;
19	>	import java.util.concurrent.ExecutorService;
20	>	import java.util.concurrent.SynchronousQueue;
21	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
22
23		public class SynchronousQueueTest extends JSR166TestCase {
24
25	<	public static void main(String[] args) {
26	<	junit.textui.TestRunner.run (suite());
25	>	public static class Fair extends BlockingQueueTest {
26	>	protected BlockingQueue emptyCollection() {
27	>	return new SynchronousQueue(true);
28	>	}
29		}
30
31	<	public static Test suite() {
32	<	return new TestSuite(SynchronousQueueTest.class);
31	>	public static class NonFair extends BlockingQueueTest {
32	>	protected BlockingQueue emptyCollection() {
33	>	return new SynchronousQueue(false);
34	>	}
35		}
36
37	<	/**
38	<	*
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)));
37	>	public static void main(String[] args) {
38	>	junit.textui.TestRunner.run(suite());
39		}
40
41	<	/**
42	<	*
43	<	*/
44	<	public void testOfferNull() {
38	<	try {
39	<	SynchronousQueue q = new SynchronousQueue();
40	<	q.offer(null);
41	<	shouldThrow();
42	<	} catch (NullPointerException success) { }
41	>	public static Test suite() {
42	>	return newTestSuite(SynchronousQueueTest.class,
43	>	new Fair().testSuite(),
44	>	new NonFair().testSuite());
45		}
46
47		/**
48	<	*
48	>	* Any SynchronousQueue is both empty and full
49		*/
50	<	public void testOffer() {
51	<	SynchronousQueue q = new SynchronousQueue();
52	<	assertFalse(q.offer(new Integer(1)));
50	>	public void testEmptyFull()      { testEmptyFull(false); }
51	>	public void testEmptyFull_fair() { testEmptyFull(true); }
52	>	public void testEmptyFull(boolean fair) {
53	>	final SynchronousQueue q = new SynchronousQueue(fair);
54	>	assertTrue(q.isEmpty());
55	>	assertEquals(0, q.size());
56	>	assertEquals(0, q.remainingCapacity());
57	>	assertFalse(q.offer(zero));
58		}
59
60		/**
61	<	*
61	>	* offer fails if no active taker
62		*/
63	<	public void testAdd() {
64	<	try {
65	<	SynchronousQueue q = new SynchronousQueue();
66	<	assertEquals(0, q.remainingCapacity());
67	<	q.add(new Integer(0));
61	<	} catch (IllegalStateException success){
62	<	}
63	>	public void testOffer()      { testOffer(false); }
64	>	public void testOffer_fair() { testOffer(true); }
65	>	public void testOffer(boolean fair) {
66	>	SynchronousQueue q = new SynchronousQueue(fair);
67	>	assertFalse(q.offer(one));
68		}
69
70		/**
71	<	*
71	>	* add throws IllegalStateException if no active taker
72		*/
73	<	public void testAddAll1() {
73	>	public void testAdd()      { testAdd(false); }
74	>	public void testAdd_fair() { testAdd(true); }
75	>	public void testAdd(boolean fair) {
76	>	SynchronousQueue q = new SynchronousQueue(fair);
77	>	assertEquals(0, q.remainingCapacity());
78		try {
79	<	SynchronousQueue q = new SynchronousQueue();
71	<	q.addAll(null);
79	>	q.add(one);
80		shouldThrow();
81	<	}
74	<	catch (NullPointerException success) {}
81	>	} catch (IllegalStateException success) {}
82		}
83	+
84		/**
85	<	*
85	>	* addAll(this) throws IllegalArgumentException
86		*/
87	<	public void testAddAll2() {
87	>	public void testAddAll_self()      { testAddAll_self(false); }
88	>	public void testAddAll_self_fair() { testAddAll_self(true); }
89	>	public void testAddAll_self(boolean fair) {
90	>	SynchronousQueue q = new SynchronousQueue(fair);
91		try {
92	<	SynchronousQueue q = new SynchronousQueue();
82	<	Integer[] ints = new Integer[1];
83	<	q.addAll(Arrays.asList(ints));
92	>	q.addAll(q);
93		shouldThrow();
94	<	}
86	<	catch (NullPointerException success) {}
94	>	} catch (IllegalArgumentException success) {}
95		}
96	+
97		/**
98	<	*
98	>	* addAll throws ISE if no active taker
99		*/
100	<	public void testAddAll4() {
100	>	public void testAddAll_ISE()      { testAddAll_ISE(false); }
101	>	public void testAddAll_ISE_fair() { testAddAll_ISE(true); }
102	>	public void testAddAll_ISE(boolean fair) {
103	>	SynchronousQueue q = new SynchronousQueue(fair);
104	>	Integer[] ints = new Integer[1];
105	>	for (int i = 0; i < ints.length; i++)
106	>	ints[i] = i;
107	>	Collection<Integer> coll = Arrays.asList(ints);
108		try {
109	<	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));
109	>	q.addAll(coll);
110		shouldThrow();
111	<	}
100	<	catch (IllegalStateException success) {}
111	>	} catch (IllegalStateException success) {}
112		}
113
114		/**
115	<	*
115	>	* put blocks interruptibly if no active taker
116		*/
117	<	public void testPutNull() {
118	<	try {
119	<	SynchronousQueue q = new SynchronousQueue();
120	<	q.put(null);
121	<	shouldThrow();
122	<	}
123	<	catch (NullPointerException success){
124	<	}
125	<	catch (InterruptedException ie) {
126	<	unexpectedException();
127	<	}
128	<	}
117	>	public void testBlockingPut()      { testBlockingPut(false); }
118	>	public void testBlockingPut_fair() { testBlockingPut(true); }
119	>	public void testBlockingPut(boolean fair) {
120	>	final SynchronousQueue q = new SynchronousQueue(fair);
121	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
122	>	Thread t = newStartedThread(new CheckedRunnable() {
123	>	public void realRun() throws InterruptedException {
124	>	Thread.currentThread().interrupt();
125	>	try {
126	>	q.put(99);
127	>	shouldThrow();
128	>	} catch (InterruptedException success) {}
129	>	assertFalse(Thread.interrupted());
130
131	<	/**
132	<	*
133	<	*/
134	<	public void testBlockingPut() {
135	<	Thread t = new Thread(new Runnable() {
136	<	public void run() {
137	<	try {
138	<	SynchronousQueue q = new SynchronousQueue();
139	<	q.put(new Integer(0));
140	<	threadShouldThrow();
141	<	} catch (InterruptedException ie){
142	<	}
143	<	}});
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	<	}
131	>	pleaseInterrupt.countDown();
132	>	try {
133	>	q.put(99);
134	>	shouldThrow();
135	>	} catch (InterruptedException success) {}
136	>	assertFalse(Thread.interrupted());
137	>	}});
138	>
139	>	await(pleaseInterrupt);
140	>	assertThreadStaysAlive(t);
141	>	t.interrupt();
142	>	awaitTermination(t);
143	>	assertEquals(0, q.remainingCapacity());
144		}
145
146		/**
147	<	*
147	>	* put blocks interruptibly waiting for take
148		*/
149	<	public void testPutWithTake() {
150	<	final SynchronousQueue q = new SynchronousQueue();
151	<	Thread t = new Thread(new Runnable() {
152	<	public void run() {
153	<	int added = 0;
154	<	try {
155	<	q.put(new Object());
156	<	++added;
157	<	q.put(new Object());
158	<	++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	<	}
149	>	public void testPutWithTake()      { testPutWithTake(false); }
150	>	public void testPutWithTake_fair() { testPutWithTake(true); }
151	>	public void testPutWithTake(boolean fair) {
152	>	final SynchronousQueue q = new SynchronousQueue(fair);
153	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
154	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
155	>	Thread t = newStartedThread(new CheckedRunnable() {
156	>	public void realRun() throws InterruptedException {
157	>	pleaseTake.countDown();
158	>	q.put(one);
159
160	<	/**
161	<	*
162	<	*/
163	<	public void testTimedOffer() {
164	<	final SynchronousQueue q = new SynchronousQueue();
165	<	Thread t = new Thread(new Runnable() {
166	<	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	<	}
160	>	pleaseInterrupt.countDown();
161	>	try {
162	>	q.put(99);
163	>	shouldThrow();
164	>	} catch (InterruptedException success) {}
165	>	assertFalse(Thread.interrupted());
166	>	}});
167
168	+	await(pleaseTake);
169	+	assertEquals(0, q.remainingCapacity());
170	+	try { assertSame(one, q.take()); }
171	+	catch (InterruptedException e) { threadUnexpectedException(e); }
172
173	<	/**
174	<	*
175	<	*/
176	<	public void testTakeFromEmpty() {
177	<	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	<	}
173	>	await(pleaseInterrupt);
174	>	assertThreadStaysAlive(t);
175	>	t.interrupt();
176	>	awaitTermination(t);
177	>	assertEquals(0, q.remainingCapacity());
178		}
179
180		/**
181	<	*
181	>	* timed offer times out if elements not taken
182		*/
183	<	public void testPoll() {
184	<	SynchronousQueue q = new SynchronousQueue();
185	<	assertNull(q.poll());
183	>	public void testTimedOffer()      { testTimedOffer(false); }
184	>	public void testTimedOffer_fair() { testTimedOffer(true); }
185	>	public void testTimedOffer(boolean fair) {
186	>	final SynchronousQueue q = new SynchronousQueue(fair);
187	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
188	>	Thread t = newStartedThread(new CheckedRunnable() {
189	>	public void realRun() throws InterruptedException {
190	>	long startTime = System.nanoTime();
191	>	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
192	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
193	>	pleaseInterrupt.countDown();
194	>	try {
195	>	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
196	>	shouldThrow();
197	>	} catch (InterruptedException success) {}
198	>	}});
199	>
200	>	await(pleaseInterrupt);
201	>	assertThreadStaysAlive(t);
202	>	t.interrupt();
203	>	awaitTermination(t);
204		}
205
206		/**
207	<	*
207	>	* poll return null if no active putter
208		*/
209	<	public void testTimedPoll0() {
210	<	try {
211	<	SynchronousQueue q = new SynchronousQueue();
212	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
213	<	} catch (InterruptedException e){
244	<	unexpectedException();
245	<	}
209	>	public void testPoll()      { testPoll(false); }
210	>	public void testPoll_fair() { testPoll(true); }
211	>	public void testPoll(boolean fair) {
212	>	final SynchronousQueue q = new SynchronousQueue(fair);
213	>	assertNull(q.poll());
214		}
215
216		/**
217	<	*
217	>	* timed poll with zero timeout times out if no active putter
218		*/
219	<	public void testTimedPoll() {
220	<	try {
221	<	SynchronousQueue q = new SynchronousQueue();
222	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
223	<	} catch (InterruptedException e){
224	<	unexpectedException();
257	<	}
219	>	public void testTimedPoll0()      { testTimedPoll0(false); }
220	>	public void testTimedPoll0_fair() { testTimedPoll0(true); }
221	>	public void testTimedPoll0(boolean fair) {
222	>	final SynchronousQueue q = new SynchronousQueue(fair);
223	>	try { assertNull(q.poll(0, MILLISECONDS)); }
224	>	catch (InterruptedException e) { threadUnexpectedException(e); }
225		}
226
227		/**
228	<	*
229	<	*/
230	<	public void testInterruptedTimedPoll() {
231	<	Thread t = new Thread(new Runnable() {
232	<	public void run() {
233	<	try {
234	<	SynchronousQueue q = new SynchronousQueue();
235	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
236	<	} catch (InterruptedException success){
237	<	}
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	<	}
228	>	* timed poll with nonzero timeout times out if no active putter
229	>	*/
230	>	public void testTimedPoll()      { testTimedPoll(false); }
231	>	public void testTimedPoll_fair() { testTimedPoll(true); }
232	>	public void testTimedPoll(boolean fair) {
233	>	final SynchronousQueue q = new SynchronousQueue(fair);
234	>	long startTime = System.nanoTime();
235	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
236	>	catch (InterruptedException e) { threadUnexpectedException(e); }
237	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
238		}
239
240		/**
241	<	*
241	>	* timed poll before a delayed offer times out, returning null;
242	>	* after offer succeeds; on interruption throws
243		*/
244	<	public void testTimedPollWithOffer() {
245	<	final SynchronousQueue q = new SynchronousQueue();
246	<	Thread t = new Thread(new Runnable() {
247	<	public void run() {
248	<	try {
249	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
250	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
251	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
252	<	threadShouldThrow();
253	<	} catch (InterruptedException success) { }
254	<	}
255	<	});
256	<	try {
257	<	t.start();
258	<	Thread.sleep(SMALL_DELAY_MS);
259	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
260	<	t.interrupt();
261	<	t.join();
262	<	} catch (Exception e){
263	<	unexpectedException();
264	<	}
265	<	}
244	>	public void testTimedPollWithOffer()      { testTimedPollWithOffer(false); }
245	>	public void testTimedPollWithOffer_fair() { testTimedPollWithOffer(true); }
246	>	public void testTimedPollWithOffer(boolean fair) {
247	>	final SynchronousQueue q = new SynchronousQueue(fair);
248	>	final CountDownLatch pleaseOffer = new CountDownLatch(1);
249	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
250	>	Thread t = newStartedThread(new CheckedRunnable() {
251	>	public void realRun() throws InterruptedException {
252	>	long startTime = System.nanoTime();
253	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
254	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
255	>
256	>	pleaseOffer.countDown();
257	>	startTime = System.nanoTime();
258	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
259	>	assertTrue(millisElapsedSince(startTime) < MEDIUM_DELAY_MS);
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	>
276	>	await(pleaseOffer);
277	>	long startTime = System.nanoTime();
278	>	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
279	>	catch (InterruptedException e) { threadUnexpectedException(e); }
280	>	assertTrue(millisElapsedSince(startTime) < MEDIUM_DELAY_MS);
281
282	+	await(pleaseInterrupt);
283	+	assertThreadStaysAlive(t);
284	+	t.interrupt();
285	+	awaitTermination(t);
286	+	}
287
288		/**
289	<	*
289	>	* peek() returns null if no active putter
290		*/
291	<	public void testPeek() {
292	<	SynchronousQueue q = new SynchronousQueue();
293	<	assertNull(q.peek());
291	>	public void testPeek()      { testPeek(false); }
292	>	public void testPeek_fair() { testPeek(true); }
293	>	public void testPeek(boolean fair) {
294	>	final SynchronousQueue q = new SynchronousQueue(fair);
295	>	assertNull(q.peek());
296		}
297
298		/**
299	<	*
299	>	* element() throws NoSuchElementException if no active putter
300		*/
301	<	public void testElement() {
302	<	SynchronousQueue q = new SynchronousQueue();
301	>	public void testElement()      { testElement(false); }
302	>	public void testElement_fair() { testElement(true); }
303	>	public void testElement(boolean fair) {
304	>	final SynchronousQueue q = new SynchronousQueue(fair);
305		try {
306		q.element();
307		shouldThrow();
308	<	}
327	<	catch (NoSuchElementException success) {}
308	>	} catch (NoSuchElementException success) {}
309		}
310
311		/**
312	<	*
312	>	* remove() throws NoSuchElementException if no active putter
313		*/
314	<	public void testRemove() {
315	<	SynchronousQueue q = new SynchronousQueue();
314	>	public void testRemove()      { testRemove(false); }
315	>	public void testRemove_fair() { testRemove(true); }
316	>	public void testRemove(boolean fair) {
317	>	final SynchronousQueue q = new SynchronousQueue(fair);
318		try {
319		q.remove();
320		shouldThrow();
321	<	} catch (NoSuchElementException success){
339	<	}
321	>	} catch (NoSuchElementException success) {}
322		}
323
324		/**
325	<	*
325	>	* contains returns false
326		*/
327	<	public void testRemoveElement() {
328	<	SynchronousQueue q = new SynchronousQueue();
329	<	assertFalse(q.remove(new Integer(0)));
330	<	assertTrue(q.isEmpty());
331	<	}
350	<
351	<	/**
352	<	*
353	<	*/
354	<	public void testContains() {
355	<	SynchronousQueue q = new SynchronousQueue();
356	<	assertFalse(q.contains(new Integer(0)));
327	>	public void testContains()      { testContains(false); }
328	>	public void testContains_fair() { testContains(true); }
329	>	public void testContains(boolean fair) {
330	>	final SynchronousQueue q = new SynchronousQueue(fair);
331	>	assertFalse(q.contains(zero));
332		}
333
334		/**
335	<	*
335	>	* clear ensures isEmpty
336		*/
337	<	public void testClear() {
338	<	SynchronousQueue q = new SynchronousQueue();
337	>	public void testClear()      { testClear(false); }
338	>	public void testClear_fair() { testClear(true); }
339	>	public void testClear(boolean fair) {
340	>	final SynchronousQueue q = new SynchronousQueue(fair);
341		q.clear();
342		assertTrue(q.isEmpty());
343		}
344
345		/**
346	<	*
346	>	* containsAll returns false unless empty
347		*/
348	<	public void testContainsAll() {
349	<	SynchronousQueue q = new SynchronousQueue();
348	>	public void testContainsAll()      { testContainsAll(false); }
349	>	public void testContainsAll_fair() { testContainsAll(true); }
350	>	public void testContainsAll(boolean fair) {
351	>	final SynchronousQueue q = new SynchronousQueue(fair);
352		Integer[] empty = new Integer[0];
353	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
353	>	assertTrue(q.containsAll(Arrays.asList(empty)));
354	>	Integer[] ints = new Integer[1]; ints[0] = zero;
355		assertFalse(q.containsAll(Arrays.asList(ints)));
356		}
357
358		/**
359	<	*
359	>	* retainAll returns false
360		*/
361	<	public void testRetainAll() {
362	<	SynchronousQueue q = new SynchronousQueue();
361	>	public void testRetainAll()      { testRetainAll(false); }
362	>	public void testRetainAll_fair() { testRetainAll(true); }
363	>	public void testRetainAll(boolean fair) {
364	>	final SynchronousQueue q = new SynchronousQueue(fair);
365		Integer[] empty = new Integer[0];
366	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
367	<	q.retainAll(Arrays.asList(ints));
368	<	assertFalse(q.containsAll(Arrays.asList(ints)));
366	>	assertFalse(q.retainAll(Arrays.asList(empty)));
367	>	Integer[] ints = new Integer[1]; ints[0] = zero;
368	>	assertFalse(q.retainAll(Arrays.asList(ints)));
369		}
370
371		/**
372	<	*
372	>	* removeAll returns false
373		*/
374	<	public void testRemoveAll() {
375	<	SynchronousQueue q = new SynchronousQueue();
374	>	public void testRemoveAll()      { testRemoveAll(false); }
375	>	public void testRemoveAll_fair() { testRemoveAll(true); }
376	>	public void testRemoveAll(boolean fair) {
377	>	final SynchronousQueue q = new SynchronousQueue(fair);
378		Integer[] empty = new Integer[0];
379	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
380	<	q.removeAll(Arrays.asList(ints));
379	>	assertFalse(q.removeAll(Arrays.asList(empty)));
380	>	Integer[] ints = new Integer[1]; ints[0] = zero;
381		assertFalse(q.containsAll(Arrays.asList(ints)));
382		}
383
384	+	/**
385	+	* toArray is empty
386	+	*/
387	+	public void testToArray()      { testToArray(false); }
388	+	public void testToArray_fair() { testToArray(true); }
389	+	public void testToArray(boolean fair) {
390	+	final SynchronousQueue q = new SynchronousQueue(fair);
391	+	Object[] o = q.toArray();
392	+	assertEquals(0, o.length);
393	+	}
394
395		/**
396	<	*
396	>	* toArray(Integer array) returns its argument with the first
397	>	* element (if present) nulled out
398		*/
399	<	public void testToArray() {
400	<	SynchronousQueue q = new SynchronousQueue();
401	<	Object[] o = q.toArray();
402	<	assertEquals(o.length, 0);
399	>	public void testToArray2()      { testToArray2(false); }
400	>	public void testToArray2_fair() { testToArray2(true); }
401	>	public void testToArray2(boolean fair) {
402	>	final SynchronousQueue<Integer> q
403	>	= new SynchronousQueue<Integer>(fair);
404	>	Integer[] a;
405	>
406	>	a = new Integer[0];
407	>	assertSame(a, q.toArray(a));
408	>
409	>	a = new Integer[3];
410	>	Arrays.fill(a, 42);
411	>	assertSame(a, q.toArray(a));
412	>	assertNull(a[0]);
413	>	for (int i = 1; i < a.length; i++)
414	>	assertEquals(42, (int) a[i]);
415		}
416
417		/**
418	<	*
418	>	* toArray(null) throws NPE
419		*/
420	<	public void testToArray2() {
421	<	SynchronousQueue q = new SynchronousQueue();
422	<	Integer[] ints = new Integer[1];
423	<	assertNull(ints[0]);
420	>	public void testToArray_null()      { testToArray_null(false); }
421	>	public void testToArray_null_fair() { testToArray_null(true); }
422	>	public void testToArray_null(boolean fair) {
423	>	final SynchronousQueue q = new SynchronousQueue(fair);
424	>	try {
425	>	Object o[] = q.toArray(null);
426	>	shouldThrow();
427	>	} catch (NullPointerException success) {}
428		}
429	<
429	>
430		/**
431	<	*
431	>	* iterator does not traverse any elements
432		*/
433	<	public void testIterator() {
434	<	SynchronousQueue q = new SynchronousQueue();
435	<	Iterator it = q.iterator();
433	>	public void testIterator()      { testIterator(false); }
434	>	public void testIterator_fair() { testIterator(true); }
435	>	public void testIterator(boolean fair) {
436	>	final SynchronousQueue q = new SynchronousQueue(fair);
437	>	Iterator it = q.iterator();
438		assertFalse(it.hasNext());
439		try {
440		Object x = it.next();
441		shouldThrow();
442	<	}
430	<	catch (NoSuchElementException success) {}
442	>	} catch (NoSuchElementException success) {}
443		}
444
445		/**
446	<	*
446	>	* iterator remove throws ISE
447		*/
448	<	public void testIteratorRemove() {
449	<	SynchronousQueue q = new SynchronousQueue();
450	<	Iterator it = q.iterator();
448	>	public void testIteratorRemove()      { testIteratorRemove(false); }
449	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
450	>	public void testIteratorRemove(boolean fair) {
451	>	final SynchronousQueue q = new SynchronousQueue(fair);
452	>	Iterator it = q.iterator();
453		try {
454		it.remove();
455		shouldThrow();
456	<	}
443	<	catch (IllegalStateException success) {}
456	>	} catch (IllegalStateException success) {}
457		}
458
459		/**
460	<	*
460	>	* toString returns a non-null string
461		*/
462	<	public void testToString() {
463	<	SynchronousQueue q = new SynchronousQueue();
462	>	public void testToString()      { testToString(false); }
463	>	public void testToString_fair() { testToString(true); }
464	>	public void testToString(boolean fair) {
465	>	final SynchronousQueue q = new SynchronousQueue(fair);
466		String s = q.toString();
467	<	assertTrue(s != null);
468	<	}
454	<
467	>	assertNotNull(s);
468	>	}
469
470		/**
471	<	*
471	>	* offer transfers elements across Executor tasks
472		*/
473	<	public void testOfferInExecutor() {
474	<	final SynchronousQueue q = new SynchronousQueue();
473	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
474	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
475	>	public void testOfferInExecutor(boolean fair) {
476	>	final SynchronousQueue q = new SynchronousQueue(fair);
477		ExecutorService executor = Executors.newFixedThreadPool(2);
478	<	final Integer one = new Integer(1);
478	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
479
480	<	executor.execute(new Runnable() {
481	<	public void run() {
482	<	threadAssertFalse(q.offer(one));
483	<	try {
484	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
485	<	threadAssertEquals(0, q.remainingCapacity());
486	<	}
487	<	catch (InterruptedException e) {
488	<	threadUnexpectedException();
489	<	}
490	<	}
491	<	});
480	>	executor.execute(new CheckedRunnable() {
481	>	public void realRun() throws InterruptedException {
482	>	assertFalse(q.offer(one));
483	>	threadsStarted.await();
484	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
485	>	assertEquals(0, q.remainingCapacity());
486	>	}});
487	>
488	>	executor.execute(new CheckedRunnable() {
489	>	public void realRun() throws InterruptedException {
490	>	threadsStarted.await();
491	>	assertSame(one, q.take());
492	>	}});
493
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	–
494		joinPool(executor);
490	–
495		}
496
497		/**
498	<	*
498	>	* timed poll retrieves elements across Executor threads
499		*/
500	<	public void testPollInExecutor() {
501	<
502	<	final SynchronousQueue q = new SynchronousQueue();
503	<
500	>	public void testPollInExecutor()      { testPollInExecutor(false); }
501	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
502	>	public void testPollInExecutor(boolean fair) {
503	>	final SynchronousQueue q = new SynchronousQueue(fair);
504	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
505		ExecutorService executor = Executors.newFixedThreadPool(2);
506	+	executor.execute(new CheckedRunnable() {
507	+	public void realRun() throws InterruptedException {
508	+	assertNull(q.poll());
509	+	threadsStarted.await();
510	+	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
511	+	assertTrue(q.isEmpty());
512	+	}});
513	+
514	+	executor.execute(new CheckedRunnable() {
515	+	public void realRun() throws InterruptedException {
516	+	threadsStarted.await();
517	+	q.put(one);
518	+	}});
519
502	–	executor.execute(new Runnable() {
503	–	public void run() {
504	–	threadAssertNull(q.poll());
505	–	try {
506	–	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
507	–	threadAssertTrue(q.isEmpty());
508	–	}
509	–	catch (InterruptedException e) {
510	–	threadUnexpectedException();
511	–	}
512	–	}
513	–	});
514	–
515	–	executor.execute(new Runnable() {
516	–	public void run() {
517	–	try {
518	–	Thread.sleep(SMALL_DELAY_MS);
519	–	q.put(new Integer(1));
520	–	}
521	–	catch (InterruptedException e) {
522	–	threadUnexpectedException();
523	–	}
524	–	}
525	–	});
526	–
520		joinPool(executor);
528	–
521		}
522
523		/**
524	<	*
524	>	* a deserialized serialized queue is usable
525		*/
526		public void testSerialization() {
527	<	SynchronousQueue q = new SynchronousQueue();
528	<	try {
529	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
530	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
531	<	out.writeObject(q);
532	<	out.close();
533	<
534	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
535	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
536	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
537	<	assertEquals(q.size(), r.size());
538	<	while (!q.isEmpty())
539	<	assertEquals(q.remove(), r.remove());
540	<	} catch(Exception e){
541	<	unexpectedException();
527	>	final SynchronousQueue x = new SynchronousQueue();
528	>	final SynchronousQueue y = new SynchronousQueue(false);
529	>	final SynchronousQueue z = new SynchronousQueue(true);
530	>	assertSerialEquals(x, y);
531	>	assertNotSerialEquals(x, z);
532	>	SynchronousQueue[] qs = { x, y, z };
533	>	for (SynchronousQueue q : qs) {
534	>	SynchronousQueue clone = serialClone(q);
535	>	assertNotSame(q, clone);
536	>	assertSerialEquals(q, clone);
537	>	assertTrue(clone.isEmpty());
538	>	assertEquals(0, clone.size());
539	>	assertEquals(0, clone.remainingCapacity());
540	>	assertFalse(clone.offer(zero));
541	>	}
542	>	}
543	>
544	>	/**
545	>	* drainTo(c) of empty queue doesn't transfer elements
546	>	*/
547	>	public void testDrainTo()      { testDrainTo(false); }
548	>	public void testDrainTo_fair() { testDrainTo(true); }
549	>	public void testDrainTo(boolean fair) {
550	>	final SynchronousQueue q = new SynchronousQueue(fair);
551	>	ArrayList l = new ArrayList();
552	>	q.drainTo(l);
553	>	assertEquals(0, q.size());
554	>	assertEquals(0, l.size());
555	>	}
556	>
557	>	/**
558	>	* drainTo empties queue, unblocking a waiting put.
559	>	*/
560	>	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
561	>	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
562	>	public void testDrainToWithActivePut(boolean fair) {
563	>	final SynchronousQueue q = new SynchronousQueue(fair);
564	>	Thread t = newStartedThread(new CheckedRunnable() {
565	>	public void realRun() throws InterruptedException {
566	>	q.put(one);
567	>	}});
568	>
569	>	ArrayList l = new ArrayList();
570	>	long startTime = System.nanoTime();
571	>	while (l.isEmpty()) {
572	>	q.drainTo(l);
573	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
574	>	fail("timed out");
575	>	Thread.yield();
576		}
577	+	assertTrue(l.size() == 1);
578	+	assertSame(one, l.get(0));
579	+	awaitTermination(t);
580	+	}
581	+
582	+	/**
583	+	* drainTo(c, n) empties up to n elements of queue into c
584	+	*/
585	+	public void testDrainToN() throws InterruptedException {
586	+	final SynchronousQueue q = new SynchronousQueue();
587	+	Thread t1 = newStartedThread(new CheckedRunnable() {
588	+	public void realRun() throws InterruptedException {
589	+	q.put(one);
590	+	}});
591	+
592	+	Thread t2 = newStartedThread(new CheckedRunnable() {
593	+	public void realRun() throws InterruptedException {
594	+	q.put(two);
595	+	}});
596	+
597	+	ArrayList l = new ArrayList();
598	+	delay(SHORT_DELAY_MS);
599	+	q.drainTo(l, 1);
600	+	assertEquals(1, l.size());
601	+	q.drainTo(l, 1);
602	+	assertEquals(2, l.size());
603	+	assertTrue(l.contains(one));
604	+	assertTrue(l.contains(two));
605	+	awaitTermination(t1);
606	+	awaitTermination(t2);
607	+	}
608	+
609	+	/**
610	+	* remove(null), contains(null) always return false
611	+	*/
612	+	public void testNeverContainsNull() {
613	+	Collection<?> q = new SynchronousQueue();
614	+	assertFalse(q.contains(null));
615	+	assertFalse(q.remove(null));
616		}
617
618		}

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