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root/jsr166/jsr166/src/test/tck/SynchronousQueueTest.java

Comparing jsr166/src/test/tck/SynchronousQueueTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 18:20:08 2003 UTC vs.
Revision 1.57 by jsr166, Sun May 14 03:48:35 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	>	import java.util.concurrent.ThreadLocalRandom;
22	>
23	>	import junit.framework.Test;
24
25		public class SynchronousQueueTest extends JSR166TestCase {
26
27	<	public static void main(String[] args) {
28	<	junit.textui.TestRunner.run (suite());
27	>	public static class Fair extends BlockingQueueTest {
28	>	protected BlockingQueue emptyCollection() {
29	>	return new SynchronousQueue(true);
30	>	}
31		}
32
33	<	public static Test suite() {
34	<	return new TestSuite(SynchronousQueueTest.class);
33	>	public static class NonFair extends BlockingQueueTest {
34	>	protected BlockingQueue emptyCollection() {
35	>	return new SynchronousQueue(false);
36	>	}
37		}
38
39	<	/**
40	<	*
25	<	*/
26	<	public void testEmptyFull() {
27	<	SynchronousQueue q = new SynchronousQueue();
28	<	assertTrue(q.isEmpty());
29	<	assertEquals(0, q.size());
30	<	assertEquals(0, q.remainingCapacity());
31	<	assertFalse(q.offer(new Integer(3)));
39	>	public static void main(String[] args) {
40	>	main(suite(), args);
41		}
42
43	<	/**
44	<	*
45	<	*/
46	<	public void testOfferNull() {
38	<	try {
39	<	SynchronousQueue q = new SynchronousQueue();
40	<	q.offer(null);
41	<	shouldThrow();
42	<	} catch (NullPointerException success) { }
43	>	public static Test suite() {
44	>	return newTestSuite(SynchronousQueueTest.class,
45	>	new Fair().testSuite(),
46	>	new NonFair().testSuite());
47		}
48
49		/**
50	<	*
50	>	* Any SynchronousQueue is both empty and full
51		*/
52	<	public void testOffer() {
53	<	SynchronousQueue q = new SynchronousQueue();
54	<	assertFalse(q.offer(new Integer(1)));
52	>	public void testEmptyFull()      { testEmptyFull(false); }
53	>	public void testEmptyFull_fair() { testEmptyFull(true); }
54	>	public void testEmptyFull(boolean fair) {
55	>	final SynchronousQueue q = new SynchronousQueue(fair);
56	>	assertTrue(q.isEmpty());
57	>	assertEquals(0, q.size());
58	>	assertEquals(0, q.remainingCapacity());
59	>	assertFalse(q.offer(zero));
60		}
61
62		/**
63	<	*
63	>	* offer fails if no active taker
64		*/
65	<	public void testAdd() {
66	<	try {
67	<	SynchronousQueue q = new SynchronousQueue();
68	<	assertEquals(0, q.remainingCapacity());
69	<	q.add(new Integer(0));
61	<	} catch (IllegalStateException success){
62	<	}
65	>	public void testOffer()      { testOffer(false); }
66	>	public void testOffer_fair() { testOffer(true); }
67	>	public void testOffer(boolean fair) {
68	>	SynchronousQueue q = new SynchronousQueue(fair);
69	>	assertFalse(q.offer(one));
70		}
71
72		/**
73	<	*
73	>	* add throws IllegalStateException if no active taker
74		*/
75	<	public void testAddAll1() {
75	>	public void testAdd()      { testAdd(false); }
76	>	public void testAdd_fair() { testAdd(true); }
77	>	public void testAdd(boolean fair) {
78	>	SynchronousQueue q = new SynchronousQueue(fair);
79	>	assertEquals(0, q.remainingCapacity());
80		try {
81	<	SynchronousQueue q = new SynchronousQueue();
71	<	q.addAll(null);
81	>	q.add(one);
82		shouldThrow();
83	<	}
74	<	catch (NullPointerException success) {}
83	>	} catch (IllegalStateException success) {}
84		}
85	+
86		/**
87	<	*
87	>	* addAll(this) throws IllegalArgumentException
88		*/
89	<	public void testAddAll2() {
89	>	public void testAddAll_self()      { testAddAll_self(false); }
90	>	public void testAddAll_self_fair() { testAddAll_self(true); }
91	>	public void testAddAll_self(boolean fair) {
92	>	SynchronousQueue q = new SynchronousQueue(fair);
93		try {
94	<	SynchronousQueue q = new SynchronousQueue();
82	<	Integer[] ints = new Integer[1];
83	<	q.addAll(Arrays.asList(ints));
94	>	q.addAll(q);
95		shouldThrow();
96	<	}
86	<	catch (NullPointerException success) {}
96	>	} catch (IllegalArgumentException success) {}
97		}
98	+
99		/**
100	<	*
100	>	* addAll throws ISE if no active taker
101		*/
102	<	public void testAddAll4() {
102	>	public void testAddAll_ISE()      { testAddAll_ISE(false); }
103	>	public void testAddAll_ISE_fair() { testAddAll_ISE(true); }
104	>	public void testAddAll_ISE(boolean fair) {
105	>	SynchronousQueue q = new SynchronousQueue(fair);
106	>	Integer[] ints = new Integer[1];
107	>	for (int i = 0; i < ints.length; i++)
108	>	ints[i] = i;
109	>	Collection<Integer> coll = Arrays.asList(ints);
110		try {
111	<	SynchronousQueue q = new SynchronousQueue();
94	<	Integer[] ints = new Integer[1];
95	<	for (int i = 0; i < 1; ++i)
96	<	ints[i] = new Integer(i);
97	<	q.addAll(Arrays.asList(ints));
111	>	q.addAll(coll);
112		shouldThrow();
113	<	}
100	<	catch (IllegalStateException success) {}
113	>	} catch (IllegalStateException success) {}
114		}
115
116		/**
117	<	*
117	>	* put blocks interruptibly if no active taker
118		*/
119	<	public void testPutNull() {
120	<	try {
121	<	SynchronousQueue q = new SynchronousQueue();
122	<	q.put(null);
123	<	shouldThrow();
124	<	}
125	<	catch (NullPointerException success){
126	<	}
127	<	catch (InterruptedException ie) {
128	<	unexpectedException();
129	<	}
130	<	}
119	>	public void testBlockingPut()      { testBlockingPut(false); }
120	>	public void testBlockingPut_fair() { testBlockingPut(true); }
121	>	public void testBlockingPut(boolean fair) {
122	>	final SynchronousQueue q = new SynchronousQueue(fair);
123	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
124	>	Thread t = newStartedThread(new CheckedRunnable() {
125	>	public void realRun() throws InterruptedException {
126	>	Thread.currentThread().interrupt();
127	>	try {
128	>	q.put(99);
129	>	shouldThrow();
130	>	} catch (InterruptedException success) {}
131	>	assertFalse(Thread.interrupted());
132
133	<	/**
134	<	*
135	<	*/
136	<	public void testBlockingPut() {
137	<	Thread t = new Thread(new Runnable() {
138	<	public void run() {
139	<	try {
140	<	SynchronousQueue q = new SynchronousQueue();
141	<	q.put(new Integer(0));
142	<	threadShouldThrow();
143	<	} catch (InterruptedException ie){
144	<	}
145	<	}});
132	<	t.start();
133	<	try {
134	<	Thread.sleep(SHORT_DELAY_MS);
135	<	t.interrupt();
136	<	t.join();
137	<	}
138	<	catch (InterruptedException ie) {
139	<	unexpectedException();
140	<	}
133	>	pleaseInterrupt.countDown();
134	>	try {
135	>	q.put(99);
136	>	shouldThrow();
137	>	} catch (InterruptedException success) {}
138	>	assertFalse(Thread.interrupted());
139	>	}});
140	>
141	>	await(pleaseInterrupt);
142	>	assertThreadBlocks(t, Thread.State.WAITING);
143	>	t.interrupt();
144	>	awaitTermination(t);
145	>	assertEquals(0, q.remainingCapacity());
146		}
147
148		/**
149	<	*
149	>	* put blocks interruptibly waiting for take
150		*/
151	<	public void testPutWithTake() {
152	<	final SynchronousQueue q = new SynchronousQueue();
153	<	Thread t = new Thread(new Runnable() {
154	<	public void run() {
155	<	int added = 0;
156	<	try {
157	<	q.put(new Object());
158	<	++added;
159	<	q.put(new Object());
160	<	++added;
161	<	q.put(new Object());
162	<	++added;
163	<	q.put(new Object());
164	<	++added;
165	<	threadShouldThrow();
166	<	} catch (InterruptedException e){
167	<	assertTrue(added >= 1);
168	<	}
169	<	}
170	<	});
171	<	try {
172	<	t.start();
173	<	Thread.sleep(SHORT_DELAY_MS);
174	<	q.take();
175	<	Thread.sleep(SHORT_DELAY_MS);
176	<	t.interrupt();
177	<	t.join();
178	<	} catch (Exception e){
179	<	unexpectedException();
175	<	}
151	>	public void testPutWithTake()      { testPutWithTake(false); }
152	>	public void testPutWithTake_fair() { testPutWithTake(true); }
153	>	public void testPutWithTake(boolean fair) {
154	>	final SynchronousQueue q = new SynchronousQueue(fair);
155	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
156	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
157	>	Thread t = newStartedThread(new CheckedRunnable() {
158	>	public void realRun() throws InterruptedException {
159	>	pleaseTake.countDown();
160	>	q.put(one);
161	>
162	>	pleaseInterrupt.countDown();
163	>	try {
164	>	q.put(99);
165	>	shouldThrow();
166	>	} catch (InterruptedException success) {}
167	>	assertFalse(Thread.interrupted());
168	>	}});
169	>
170	>	await(pleaseTake);
171	>	assertEquals(0, q.remainingCapacity());
172	>	try { assertSame(one, q.take()); }
173	>	catch (InterruptedException e) { threadUnexpectedException(e); }
174	>
175	>	await(pleaseInterrupt);
176	>	assertThreadBlocks(t, Thread.State.WAITING);
177	>	t.interrupt();
178	>	awaitTermination(t);
179	>	assertEquals(0, q.remainingCapacity());
180		}
181
182		/**
183	<	*
183	>	* timed offer times out if elements not taken
184		*/
185		public void testTimedOffer() {
186	<	final SynchronousQueue q = new SynchronousQueue();
187	<	Thread t = new Thread(new Runnable() {
188	<	public void run() {
189	<	try {
190	<
191	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
192	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
193	<	threadShouldThrow();
194	<	} catch (InterruptedException success){}
195	<	}
196	<	});
197	<
198	<	try {
199	<	t.start();
200	<	Thread.sleep(SMALL_DELAY_MS);
197	<	t.interrupt();
198	<	t.join();
199	<	} catch (Exception e){
200	<	unexpectedException();
201	<	}
202	<	}
203	<
186	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
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	<	/**
203	<	*
204	<	*/
205	<	public void testTakeFromEmpty() {
209	<	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	<	}
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 testPoll() {
212	<	SynchronousQueue q = new SynchronousQueue();
213	<	assertNull(q.poll());
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 testTimedPoll0() {
222	<	try {
223	<	SynchronousQueue q = new SynchronousQueue();
224	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
225	<	} catch (InterruptedException e){
226	<	unexpectedException();
245	<	}
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	<	*
230	>	* timed poll with nonzero timeout times out if no active putter
231		*/
232		public void testTimedPoll() {
233	<	try {
234	<	SynchronousQueue q = new SynchronousQueue();
235	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
236	<	} catch (InterruptedException e){
237	<	unexpectedException();
238	<	}
258	<	}
259	<
260	<	/**
261	<	*
262	<	*/
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	<	}
233	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
234	>	final SynchronousQueue q = new SynchronousQueue(fair);
235	>	final long startTime = System.nanoTime();
236	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
237	>	catch (InterruptedException e) { threadUnexpectedException(e); }
238	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
239		}
240
241		/**
242	<	*
242	>	* timed poll before a delayed offer times out, returning null;
243	>	* after offer succeeds; on interruption throws
244		*/
245		public void testTimedPollWithOffer() {
246	<	final SynchronousQueue q = new SynchronousQueue();
247	<	Thread t = new Thread(new Runnable() {
248	<	public void run() {
249	<	try {
250	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
251	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
252	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
253	<	threadShouldThrow();
254	<	} catch (InterruptedException success) { }
255	<	}
256	<	});
257	<	try {
258	<	t.start();
259	<	Thread.sleep(SMALL_DELAY_MS);
260	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
261	<	t.interrupt();
262	<	t.join();
263	<	} catch (Exception e){
264	<	unexpectedException();
265	<	}
266	<	}
246	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
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	>
260	>	Thread.currentThread().interrupt();
261	>	try {
262	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
263	>	shouldThrow();
264	>	} catch (InterruptedException success) {}
265	>	assertFalse(Thread.interrupted());
266	>
267	>	pleaseInterrupt.countDown();
268	>	try {
269	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
270	>	shouldThrow();
271	>	} catch (InterruptedException success) {}
272	>	assertFalse(Thread.interrupted());
273	>
274	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
275	>	}});
276
277	+	await(pleaseOffer);
278	+	long startTime = System.nanoTime();
279	+	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
280	+	catch (InterruptedException e) { threadUnexpectedException(e); }
281	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
282	+
283	+	await(pleaseInterrupt);
284	+	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
285	+	t.interrupt();
286	+	awaitTermination(t);
287	+	}
288
289		/**
290	<	*
290	>	* peek() returns null if no active putter
291		*/
292	<	public void testPeek() {
293	<	SynchronousQueue q = new SynchronousQueue();
294	<	assertNull(q.peek());
292	>	public void testPeek()      { testPeek(false); }
293	>	public void testPeek_fair() { testPeek(true); }
294	>	public void testPeek(boolean fair) {
295	>	final SynchronousQueue q = new SynchronousQueue(fair);
296	>	assertNull(q.peek());
297		}
298
299		/**
300	<	*
300	>	* element() throws NoSuchElementException if no active putter
301		*/
302	<	public void testElement() {
303	<	SynchronousQueue q = new SynchronousQueue();
302	>	public void testElement()      { testElement(false); }
303	>	public void testElement_fair() { testElement(true); }
304	>	public void testElement(boolean fair) {
305	>	final SynchronousQueue q = new SynchronousQueue(fair);
306		try {
307		q.element();
308		shouldThrow();
309	<	}
327	<	catch (NoSuchElementException success) {}
309	>	} catch (NoSuchElementException success) {}
310		}
311
312		/**
313	<	*
313	>	* remove() throws NoSuchElementException if no active putter
314		*/
315	<	public void testRemove() {
316	<	SynchronousQueue q = new SynchronousQueue();
315	>	public void testRemove()      { testRemove(false); }
316	>	public void testRemove_fair() { testRemove(true); }
317	>	public void testRemove(boolean fair) {
318	>	final SynchronousQueue q = new SynchronousQueue(fair);
319		try {
320		q.remove();
321		shouldThrow();
322	<	} catch (NoSuchElementException success){
339	<	}
322	>	} catch (NoSuchElementException success) {}
323		}
324
325		/**
326	<	*
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	<	*
326	>	* contains returns false
327		*/
328	<	public void testContains() {
329	<	SynchronousQueue q = new SynchronousQueue();
330	<	assertFalse(q.contains(new Integer(0)));
328	>	public void testContains()      { testContains(false); }
329	>	public void testContains_fair() { testContains(true); }
330	>	public void testContains(boolean fair) {
331	>	final SynchronousQueue q = new SynchronousQueue(fair);
332	>	assertFalse(q.contains(zero));
333		}
334
335		/**
336	<	*
336	>	* clear ensures isEmpty
337		*/
338	<	public void testClear() {
339	<	SynchronousQueue q = new SynchronousQueue();
338	>	public void testClear()      { testClear(false); }
339	>	public void testClear_fair() { testClear(true); }
340	>	public void testClear(boolean fair) {
341	>	final SynchronousQueue q = new SynchronousQueue(fair);
342		q.clear();
343		assertTrue(q.isEmpty());
344		}
345
346		/**
347	<	*
347	>	* containsAll returns false unless empty
348		*/
349	<	public void testContainsAll() {
350	<	SynchronousQueue q = new SynchronousQueue();
349	>	public void testContainsAll()      { testContainsAll(false); }
350	>	public void testContainsAll_fair() { testContainsAll(true); }
351	>	public void testContainsAll(boolean fair) {
352	>	final SynchronousQueue q = new SynchronousQueue(fair);
353		Integer[] empty = new Integer[0];
354	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
354	>	assertTrue(q.containsAll(Arrays.asList(empty)));
355	>	Integer[] ints = new Integer[1]; ints[0] = zero;
356		assertFalse(q.containsAll(Arrays.asList(ints)));
357		}
358
359		/**
360	<	*
360	>	* retainAll returns false
361		*/
362	<	public void testRetainAll() {
363	<	SynchronousQueue q = new SynchronousQueue();
362	>	public void testRetainAll()      { testRetainAll(false); }
363	>	public void testRetainAll_fair() { testRetainAll(true); }
364	>	public void testRetainAll(boolean fair) {
365	>	final SynchronousQueue q = new SynchronousQueue(fair);
366		Integer[] empty = new Integer[0];
367	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
368	<	q.retainAll(Arrays.asList(ints));
369	<	assertFalse(q.containsAll(Arrays.asList(ints)));
367	>	assertFalse(q.retainAll(Arrays.asList(empty)));
368	>	Integer[] ints = new Integer[1]; ints[0] = zero;
369	>	assertFalse(q.retainAll(Arrays.asList(ints)));
370		}
371
372		/**
373	<	*
373	>	* removeAll returns false
374		*/
375	<	public void testRemoveAll() {
376	<	SynchronousQueue q = new SynchronousQueue();
375	>	public void testRemoveAll()      { testRemoveAll(false); }
376	>	public void testRemoveAll_fair() { testRemoveAll(true); }
377	>	public void testRemoveAll(boolean fair) {
378	>	final SynchronousQueue q = new SynchronousQueue(fair);
379		Integer[] empty = new Integer[0];
380	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
381	<	q.removeAll(Arrays.asList(ints));
380	>	assertFalse(q.removeAll(Arrays.asList(empty)));
381	>	Integer[] ints = new Integer[1]; ints[0] = zero;
382		assertFalse(q.containsAll(Arrays.asList(ints)));
383		}
384
400	–
385		/**
386	<	*
386	>	* toArray is empty
387		*/
388	<	public void testToArray() {
389	<	SynchronousQueue q = new SynchronousQueue();
390	<	Object[] o = q.toArray();
391	<	assertEquals(o.length, 0);
388	>	public void testToArray()      { testToArray(false); }
389	>	public void testToArray_fair() { testToArray(true); }
390	>	public void testToArray(boolean fair) {
391	>	final SynchronousQueue q = new SynchronousQueue(fair);
392	>	Object[] o = q.toArray();
393	>	assertEquals(0, o.length);
394		}
395
396		/**
397	<	*
397	>	* toArray(Integer array) returns its argument with the first
398	>	* element (if present) nulled out
399		*/
400	<	public void testToArray2() {
401	<	SynchronousQueue q = new SynchronousQueue();
402	<	Integer[] ints = new Integer[1];
403	<	assertNull(ints[0]);
400	>	public void testToArray2()      { testToArray2(false); }
401	>	public void testToArray2_fair() { testToArray2(true); }
402	>	public void testToArray2(boolean fair) {
403	>	final SynchronousQueue<Integer> q = new SynchronousQueue<>(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	<
416	>
417		/**
418	<	*
418	>	* toArray(null) throws NPE
419		*/
420	<	public void testIterator() {
421	<	SynchronousQueue q = new SynchronousQueue();
422	<	Iterator it = q.iterator();
423	<	assertFalse(it.hasNext());
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 x = it.next();
425	>	Object[] o = q.toArray(null);
426		shouldThrow();
427	<	}
430	<	catch (NoSuchElementException success) {}
427	>	} catch (NullPointerException success) {}
428		}
429
430		/**
431	<	*
431	>	* iterator does not traverse any elements
432		*/
433	<	public void testIteratorRemove() {
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	>	assertIteratorExhausted(new SynchronousQueue(fair).iterator());
437	>	}
438	>
439	>	/**
440	>	* iterator remove throws ISE
441	>	*/
442	>	public void testIteratorRemove()      { testIteratorRemove(false); }
443	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
444	>	public void testIteratorRemove(boolean fair) {
445	>	final SynchronousQueue q = new SynchronousQueue(fair);
446	>	Iterator it = q.iterator();
447		try {
448		it.remove();
449		shouldThrow();
450	<	}
443	<	catch (IllegalStateException success) {}
450	>	} catch (IllegalStateException success) {}
451		}
452
453		/**
454	<	*
454	>	* toString returns a non-null string
455		*/
456	<	public void testToString() {
457	<	SynchronousQueue q = new SynchronousQueue();
456	>	public void testToString()      { testToString(false); }
457	>	public void testToString_fair() { testToString(true); }
458	>	public void testToString(boolean fair) {
459	>	final SynchronousQueue q = new SynchronousQueue(fair);
460		String s = q.toString();
461	<	assertTrue(s != null);
462	<	}
454	<
461	>	assertNotNull(s);
462	>	}
463
464		/**
465	<	*
465	>	* offer transfers elements across Executor tasks
466		*/
467	<	public void testOfferInExecutor() {
468	<	final SynchronousQueue q = new SynchronousQueue();
469	<	ExecutorService executor = Executors.newFixedThreadPool(2);
470	<	final Integer one = new Integer(1);
471	<
472	<	executor.execute(new Runnable() {
473	<	public void run() {
474	<	threadAssertFalse(q.offer(one));
475	<	try {
476	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
477	<	threadAssertEquals(0, q.remainingCapacity());
478	<	}
479	<	catch (InterruptedException e) {
480	<	threadUnexpectedException();
481	<	}
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);
467	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
468	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
469	>	public void testOfferInExecutor(boolean fair) {
470	>	final SynchronousQueue q = new SynchronousQueue(fair);
471	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
472	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
473	>	try (PoolCleaner cleaner = cleaner(executor)) {
474	>
475	>	executor.execute(new CheckedRunnable() {
476	>	public void realRun() throws InterruptedException {
477	>	assertFalse(q.offer(one));
478	>	threadsStarted.await();
479	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
480	>	assertEquals(0, q.remainingCapacity());
481	>	}});
482
483	+	executor.execute(new CheckedRunnable() {
484	+	public void realRun() throws InterruptedException {
485	+	threadsStarted.await();
486	+	assertSame(one, q.take());
487	+	}});
488	+	}
489		}
490
491		/**
492	<	*
492	>	* timed poll retrieves elements across Executor threads
493		*/
494	<	public void testPollInExecutor() {
494	>	public void testPollInExecutor()      { testPollInExecutor(false); }
495	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
496	>	public void testPollInExecutor(boolean fair) {
497	>	final SynchronousQueue q = new SynchronousQueue(fair);
498	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
499	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
500	>	try (PoolCleaner cleaner = cleaner(executor)) {
501	>	executor.execute(new CheckedRunnable() {
502	>	public void realRun() throws InterruptedException {
503	>	assertNull(q.poll());
504	>	threadsStarted.await();
505	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
506	>	assertTrue(q.isEmpty());
507	>	}});
508
509	<	final SynchronousQueue q = new SynchronousQueue();
509	>	executor.execute(new CheckedRunnable() {
510	>	public void realRun() throws InterruptedException {
511	>	threadsStarted.await();
512	>	q.put(one);
513	>	}});
514	>	}
515	>	}
516
517	<	ExecutorService executor = Executors.newFixedThreadPool(2);
517	>	/**
518	>	* a deserialized serialized queue is usable
519	>	*/
520	>	public void testSerialization() {
521	>	final SynchronousQueue x = new SynchronousQueue();
522	>	final SynchronousQueue y = new SynchronousQueue(false);
523	>	final SynchronousQueue z = new SynchronousQueue(true);
524	>	assertSerialEquals(x, y);
525	>	assertNotSerialEquals(x, z);
526	>	SynchronousQueue[] qs = { x, y, z };
527	>	for (SynchronousQueue q : qs) {
528	>	SynchronousQueue clone = serialClone(q);
529	>	assertNotSame(q, clone);
530	>	assertSerialEquals(q, clone);
531	>	assertTrue(clone.isEmpty());
532	>	assertEquals(0, clone.size());
533	>	assertEquals(0, clone.remainingCapacity());
534	>	assertFalse(clone.offer(zero));
535	>	}
536	>	}
537
538	<	executor.execute(new Runnable() {
539	<	public void run() {
540	<	threadAssertNull(q.poll());
541	<	try {
542	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
543	<	threadAssertTrue(q.isEmpty());
544	<	}
545	<	catch (InterruptedException e) {
546	<	threadUnexpectedException();
547	<	}
548	<	}
549	<	});
538	>	/**
539	>	* drainTo(c) of empty queue doesn't transfer elements
540	>	*/
541	>	public void testDrainTo()      { testDrainTo(false); }
542	>	public void testDrainTo_fair() { testDrainTo(true); }
543	>	public void testDrainTo(boolean fair) {
544	>	final SynchronousQueue q = new SynchronousQueue(fair);
545	>	ArrayList l = new ArrayList();
546	>	q.drainTo(l);
547	>	assertEquals(0, q.size());
548	>	assertEquals(0, l.size());
549	>	}
550
551	<	executor.execute(new Runnable() {
552	<	public void run() {
553	<	try {
554	<	Thread.sleep(SMALL_DELAY_MS);
555	<	q.put(new Integer(1));
556	<	}
557	<	catch (InterruptedException e) {
558	<	threadUnexpectedException();
559	<	}
560	<	}
561	<	});
526	<
527	<	joinPool(executor);
551	>	/**
552	>	* drainTo empties queue, unblocking a waiting put.
553	>	*/
554	>	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
555	>	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
556	>	public void testDrainToWithActivePut(boolean fair) {
557	>	final SynchronousQueue q = new SynchronousQueue(fair);
558	>	Thread t = newStartedThread(new CheckedRunnable() {
559	>	public void realRun() throws InterruptedException {
560	>	q.put(one);
561	>	}});
562
563	+	ArrayList l = new ArrayList();
564	+	long startTime = System.nanoTime();
565	+	while (l.isEmpty()) {
566	+	q.drainTo(l);
567	+	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
568	+	fail("timed out");
569	+	Thread.yield();
570	+	}
571	+	assertEquals(1, l.size());
572	+	assertSame(one, l.get(0));
573	+	awaitTermination(t);
574		}
575
576		/**
577	<	*
577	>	* drainTo(c, n) empties up to n elements of queue into c
578		*/
579	<	public void testSerialization() {
580	<	SynchronousQueue q = new SynchronousQueue();
581	<	try {
582	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
583	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
584	<	out.writeObject(q);
585	<	out.close();
586	<
587	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
588	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
589	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
590	<	assertEquals(q.size(), r.size());
591	<	while (!q.isEmpty())
592	<	assertEquals(q.remove(), r.remove());
593	<	} catch(Exception e){
594	<	unexpectedException();
595	<	}
579	>	public void testDrainToN() throws InterruptedException {
580	>	final SynchronousQueue q = new SynchronousQueue();
581	>	Thread t1 = newStartedThread(new CheckedRunnable() {
582	>	public void realRun() throws InterruptedException {
583	>	q.put(one);
584	>	}});
585	>
586	>	Thread t2 = newStartedThread(new CheckedRunnable() {
587	>	public void realRun() throws InterruptedException {
588	>	q.put(two);
589	>	}});
590	>
591	>	ArrayList l = new ArrayList();
592	>	int drained;
593	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
594	>	assertEquals(1, drained);
595	>	assertEquals(1, l.size());
596	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
597	>	assertEquals(1, drained);
598	>	assertEquals(2, l.size());
599	>	assertTrue(l.contains(one));
600	>	assertTrue(l.contains(two));
601	>	awaitTermination(t1);
602	>	awaitTermination(t2);
603	>	}
604	>
605	>	/**
606	>	* remove(null), contains(null) always return false
607	>	*/
608	>	public void testNeverContainsNull() {
609	>	Collection<?> q = new SynchronousQueue();
610	>	assertFalse(q.contains(null));
611	>	assertFalse(q.remove(null));
612		}
613
614		}

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