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Comparing jsr166/src/test/tck/SynchronousQueueTest.java (file contents):
Revision 1.5 by dl, Thu Sep 25 11:02:41 2003 UTC vs.
Revision 1.58 by jsr166, Sun May 14 04:02:06 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 class Fair extends BlockingQueueTest {
28	+	protected BlockingQueue emptyCollection() {
29	+	return new SynchronousQueue(true);
30	+	}
31	+	}
32	+
33	+	public static class NonFair extends BlockingQueueTest {
34	+	protected BlockingQueue emptyCollection() {
35	+	return new SynchronousQueue(false);
36	+	}
37	+	}
38	+
39		public static void main(String[] args) {
40	<	junit.textui.TestRunner.run (suite());
40	>	main(suite(), args);
41		}
42
43		public static Test suite() {
44	<	return new TestSuite(SynchronousQueueTest.class);
44	>	return newTestSuite(SynchronousQueueTest.class,
45	>	new Fair().testSuite(),
46	>	new NonFair().testSuite());
47		}
48
49		/**
50	<	* A SynchronousQueue is both empty and full
50	>	* Any SynchronousQueue is both empty and full
51		*/
52	<	public void testEmptyFull() {
53	<	SynchronousQueue q = new SynchronousQueue();
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());
57	>	assertEquals(0, q.size());
58		assertEquals(0, q.remainingCapacity());
59		assertFalse(q.offer(zero));
60		}
61
62		/**
35	–	* offer(null) throws NPE
36	–	*/
37	–	public void testOfferNull() {
38	–	try {
39	–	SynchronousQueue q = new SynchronousQueue();
40	–	q.offer(null);
41	–	shouldThrow();
42	–	} catch (NullPointerException success) { }
43	–	}
44	–
45	–	/**
63		* offer fails if no active taker
64		*/
65	<	public void testOffer() {
66	<	SynchronousQueue q = new SynchronousQueue();
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	<	* add throws ISE if no active taker
73	>	* add throws IllegalStateException if no active taker
74		*/
75	<	public void testAdd() {
76	<	try {
77	<	SynchronousQueue q = new SynchronousQueue();
78	<	assertEquals(0, q.remainingCapacity());
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		q.add(one);
82		shouldThrow();
83	<	} catch (IllegalStateException success){
63	<	}
83	>	} catch (IllegalStateException success) {}
84		}
85
86		/**
87	<	* addAll(null) throws NPE
68	<	*/
69	<	public void testAddAll1() {
70	<	try {
71	<	SynchronousQueue q = new SynchronousQueue();
72	<	q.addAll(null);
73	<	shouldThrow();
74	<	}
75	<	catch (NullPointerException success) {}
76	<	}
77	<	/**
78	<	* addAll of a collection with null elements throws NPE
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();
83	<	Integer[] ints = new Integer[1];
84	<	q.addAll(Arrays.asList(ints));
94	>	q.addAll(q);
95		shouldThrow();
96	<	}
87	<	catch (NullPointerException success) {}
96	>	} catch (IllegalArgumentException success) {}
97		}
98	+
99		/**
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();
95	<	Integer[] ints = new Integer[1];
96	<	for (int i = 0; i < 1; ++i)
97	<	ints[i] = new Integer(i);
98	<	q.addAll(Arrays.asList(ints));
111	>	q.addAll(coll);
112		shouldThrow();
113	<	}
101	<	catch (IllegalStateException success) {}
113	>	} catch (IllegalStateException success) {}
114		}
115
116		/**
105	–	* put(null) throws NPE
106	–	*/
107	–	public void testPutNull() {
108	–	try {
109	–	SynchronousQueue q = new SynchronousQueue();
110	–	q.put(null);
111	–	shouldThrow();
112	–	}
113	–	catch (NullPointerException success){
114	–	}
115	–	catch (InterruptedException ie) {
116	–	unexpectedException();
117	–	}
118	–	}
119	–
120	–	/**
117		* put blocks interruptibly if no active taker
118		*/
119	<	public void testBlockingPut() {
120	<	Thread t = new Thread(new Runnable() {
121	<	public void run() {
122	<	try {
123	<	SynchronousQueue q = new SynchronousQueue();
124	<	q.put(zero);
125	<	threadShouldThrow();
126	<	} catch (InterruptedException ie){
127	<	}
128	<	}});
129	<	t.start();
130	<	try {
131	<	Thread.sleep(SHORT_DELAY_MS);
132	<	t.interrupt();
133	<	t.join();
134	<	}
135	<	catch (InterruptedException ie) {
136	<	unexpectedException();
137	<	}
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	>	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	<	* put blocks waiting for take
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();
180	<	}
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	>	Thread.currentThread().interrupt();
163	>	try {
164	>	q.put(99);
165	>	shouldThrow();
166	>	} catch (InterruptedException success) {}
167	>	assertFalse(Thread.interrupted());
168	>
169	>	pleaseInterrupt.countDown();
170	>	try {
171	>	q.put(99);
172	>	shouldThrow();
173	>	} catch (InterruptedException success) {}
174	>	assertFalse(Thread.interrupted());
175	>	}});
176	>
177	>	await(pleaseTake);
178	>	assertEquals(0, q.remainingCapacity());
179	>	try { assertSame(one, q.take()); }
180	>	catch (InterruptedException e) { threadUnexpectedException(e); }
181	>
182	>	await(pleaseInterrupt);
183	>	assertThreadBlocks(t, Thread.State.WAITING);
184	>	t.interrupt();
185	>	awaitTermination(t);
186	>	assertEquals(0, q.remainingCapacity());
187		}
188
189		/**
190		* timed offer times out if elements not taken
191		*/
192		public void testTimedOffer() {
193	<	final SynchronousQueue q = new SynchronousQueue();
194	<	Thread t = new Thread(new Runnable() {
195	<	public void run() {
196	<	try {
197	<
198	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
199	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
200	<	threadShouldThrow();
201	<	} catch (InterruptedException success){}
202	<	}
203	<	});
204	<
205	<	try {
206	<	t.start();
207	<	Thread.sleep(SMALL_DELAY_MS);
198	<	t.interrupt();
199	<	t.join();
200	<	} catch (Exception e){
201	<	unexpectedException();
202	<	}
203	<	}
204	<
193	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
194	>	final SynchronousQueue q = new SynchronousQueue(fair);
195	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
196	>	Thread t = newStartedThread(new CheckedRunnable() {
197	>	public void realRun() throws InterruptedException {
198	>	long startTime = System.nanoTime();
199	>	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
200	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
201	>	pleaseInterrupt.countDown();
202	>	try {
203	>	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
204	>	shouldThrow();
205	>	} catch (InterruptedException success) {}
206	>	assertFalse(Thread.interrupted());
207	>	}});
208
209	<	/**
210	<	* take blocks interruptibly when empty
211	<	*/
212	<	public void testTakeFromEmpty() {
210	<	final SynchronousQueue q = new SynchronousQueue();
211	<	Thread t = new Thread(new Runnable() {
212	<	public void run() {
213	<	try {
214	<	q.take();
215	<	threadShouldThrow();
216	<	} catch (InterruptedException success){ }
217	<	}
218	<	});
219	<	try {
220	<	t.start();
221	<	Thread.sleep(SHORT_DELAY_MS);
222	<	t.interrupt();
223	<	t.join();
224	<	} catch (Exception e){
225	<	unexpectedException();
226	<	}
209	>	await(pleaseInterrupt);
210	>	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
211	>	t.interrupt();
212	>	awaitTermination(t);
213		}
214
215		/**
216	<	* poll fails unless active taker
216	>	* poll return null if no active putter
217		*/
218	<	public void testPoll() {
219	<	SynchronousQueue q = new SynchronousQueue();
220	<	assertNull(q.poll());
218	>	public void testPoll()      { testPoll(false); }
219	>	public void testPoll_fair() { testPoll(true); }
220	>	public void testPoll(boolean fair) {
221	>	final SynchronousQueue q = new SynchronousQueue(fair);
222	>	assertNull(q.poll());
223		}
224
225		/**
226	<	* timed pool with zero timeout times out if no active taker
226	>	* timed poll with zero timeout times out if no active putter
227		*/
228	<	public void testTimedPoll0() {
229	<	try {
230	<	SynchronousQueue q = new SynchronousQueue();
231	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
232	<	} catch (InterruptedException e){
233	<	unexpectedException();
246	<	}
228	>	public void testTimedPoll0()      { testTimedPoll0(false); }
229	>	public void testTimedPoll0_fair() { testTimedPoll0(true); }
230	>	public void testTimedPoll0(boolean fair) {
231	>	final SynchronousQueue q = new SynchronousQueue(fair);
232	>	try { assertNull(q.poll(0, MILLISECONDS)); }
233	>	catch (InterruptedException e) { threadUnexpectedException(e); }
234		}
235
236		/**
237	<	* timed pool with nonzero timeout times out if no active taker
237	>	* timed poll with nonzero timeout times out if no active putter
238		*/
239		public void testTimedPoll() {
240	<	try {
241	<	SynchronousQueue q = new SynchronousQueue();
242	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
243	<	} catch (InterruptedException e){
244	<	unexpectedException();
245	<	}
259	<	}
260	<
261	<	/**
262	<	* Interrupted timed poll throws InterruptedException instead of
263	<	* returning timeout status
264	<	*/
265	<	public void testInterruptedTimedPoll() {
266	<	Thread t = new Thread(new Runnable() {
267	<	public void run() {
268	<	try {
269	<	SynchronousQueue q = new SynchronousQueue();
270	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
271	<	} catch (InterruptedException success){
272	<	}
273	<	}});
274	<	t.start();
275	<	try {
276	<	Thread.sleep(SHORT_DELAY_MS);
277	<	t.interrupt();
278	<	t.join();
279	<	}
280	<	catch (InterruptedException ie) {
281	<	unexpectedException();
282	<	}
240	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
241	>	final SynchronousQueue q = new SynchronousQueue(fair);
242	>	final long startTime = System.nanoTime();
243	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
244	>	catch (InterruptedException e) { threadUnexpectedException(e); }
245	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
246		}
247
248		/**
249	<	*  timed poll before a delayed offer fails; after offer succeeds;
250	<	*  on interruption throws
249	>	* timed poll before a delayed offer times out, returning null;
250	>	* after offer succeeds; on interruption throws
251		*/
252		public void testTimedPollWithOffer() {
253	<	final SynchronousQueue q = new SynchronousQueue();
254	<	Thread t = new Thread(new Runnable() {
255	<	public void run() {
256	<	try {
257	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
258	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
259	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
260	<	threadShouldThrow();
261	<	} catch (InterruptedException success) { }
262	<	}
263	<	});
264	<	try {
265	<	t.start();
266	<	Thread.sleep(SMALL_DELAY_MS);
267	<	assertTrue(q.offer(zero, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
268	<	t.interrupt();
269	<	t.join();
270	<	} catch (Exception e){
271	<	unexpectedException();
272	<	}
273	<	}
253	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
254	>	final SynchronousQueue q = new SynchronousQueue(fair);
255	>	final CountDownLatch pleaseOffer = new CountDownLatch(1);
256	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
257	>	Thread t = newStartedThread(new CheckedRunnable() {
258	>	public void realRun() throws InterruptedException {
259	>	long startTime = System.nanoTime();
260	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
261	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
262	>
263	>	pleaseOffer.countDown();
264	>	startTime = System.nanoTime();
265	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
266	>
267	>	Thread.currentThread().interrupt();
268	>	try {
269	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
270	>	shouldThrow();
271	>	} catch (InterruptedException success) {}
272	>	assertFalse(Thread.interrupted());
273	>
274	>	pleaseInterrupt.countDown();
275	>	try {
276	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
277	>	shouldThrow();
278	>	} catch (InterruptedException success) {}
279	>	assertFalse(Thread.interrupted());
280	>
281	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
282	>	}});
283
284	+	await(pleaseOffer);
285	+	long startTime = System.nanoTime();
286	+	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
287	+	catch (InterruptedException e) { threadUnexpectedException(e); }
288	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
289	+
290	+	await(pleaseInterrupt);
291	+	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
292	+	t.interrupt();
293	+	awaitTermination(t);
294	+	}
295
296		/**
297	<	* peek returns null
297	>	* peek() returns null if no active putter
298		*/
299	<	public void testPeek() {
300	<	SynchronousQueue q = new SynchronousQueue();
301	<	assertNull(q.peek());
299	>	public void testPeek()      { testPeek(false); }
300	>	public void testPeek_fair() { testPeek(true); }
301	>	public void testPeek(boolean fair) {
302	>	final SynchronousQueue q = new SynchronousQueue(fair);
303	>	assertNull(q.peek());
304		}
305
306		/**
307	<	* element throws NSEE
307	>	* element() throws NoSuchElementException if no active putter
308		*/
309	<	public void testElement() {
310	<	SynchronousQueue q = new SynchronousQueue();
309	>	public void testElement()      { testElement(false); }
310	>	public void testElement_fair() { testElement(true); }
311	>	public void testElement(boolean fair) {
312	>	final SynchronousQueue q = new SynchronousQueue(fair);
313		try {
314		q.element();
315		shouldThrow();
316	<	}
330	<	catch (NoSuchElementException success) {}
316	>	} catch (NoSuchElementException success) {}
317		}
318
319		/**
320	<	* remove throws NSEE if no active taker
320	>	* remove() throws NoSuchElementException if no active putter
321		*/
322	<	public void testRemove() {
323	<	SynchronousQueue q = new SynchronousQueue();
322	>	public void testRemove()      { testRemove(false); }
323	>	public void testRemove_fair() { testRemove(true); }
324	>	public void testRemove(boolean fair) {
325	>	final SynchronousQueue q = new SynchronousQueue(fair);
326		try {
327		q.remove();
328		shouldThrow();
329	<	} catch (NoSuchElementException success){
342	<	}
329	>	} catch (NoSuchElementException success) {}
330		}
331
332		/**
346	–	* remove(x) returns false
347	–	*/
348	–	public void testRemoveElement() {
349	–	SynchronousQueue q = new SynchronousQueue();
350	–	assertFalse(q.remove(zero));
351	–	assertTrue(q.isEmpty());
352	–	}
353	–
354	–	/**
333		* contains returns false
334		*/
335	<	public void testContains() {
336	<	SynchronousQueue q = new SynchronousQueue();
335	>	public void testContains()      { testContains(false); }
336	>	public void testContains_fair() { testContains(true); }
337	>	public void testContains(boolean fair) {
338	>	final SynchronousQueue q = new SynchronousQueue(fair);
339		assertFalse(q.contains(zero));
340		}
341
342		/**
343		* clear ensures isEmpty
344		*/
345	<	public void testClear() {
346	<	SynchronousQueue q = new SynchronousQueue();
345	>	public void testClear()      { testClear(false); }
346	>	public void testClear_fair() { testClear(true); }
347	>	public void testClear(boolean fair) {
348	>	final SynchronousQueue q = new SynchronousQueue(fair);
349		q.clear();
350		assertTrue(q.isEmpty());
351		}
#	Line 371 | Line 353 | public class SynchronousQueueTest extend
353		/**
354		* containsAll returns false unless empty
355		*/
356	<	public void testContainsAll() {
357	<	SynchronousQueue q = new SynchronousQueue();
356	>	public void testContainsAll()      { testContainsAll(false); }
357	>	public void testContainsAll_fair() { testContainsAll(true); }
358	>	public void testContainsAll(boolean fair) {
359	>	final SynchronousQueue q = new SynchronousQueue(fair);
360		Integer[] empty = new Integer[0];
361		assertTrue(q.containsAll(Arrays.asList(empty)));
362		Integer[] ints = new Integer[1]; ints[0] = zero;
#	Line 382 | Line 366 | public class SynchronousQueueTest extend
366		/**
367		* retainAll returns false
368		*/
369	<	public void testRetainAll() {
370	<	SynchronousQueue q = new SynchronousQueue();
369	>	public void testRetainAll()      { testRetainAll(false); }
370	>	public void testRetainAll_fair() { testRetainAll(true); }
371	>	public void testRetainAll(boolean fair) {
372	>	final SynchronousQueue q = new SynchronousQueue(fair);
373		Integer[] empty = new Integer[0];
374		assertFalse(q.retainAll(Arrays.asList(empty)));
375		Integer[] ints = new Integer[1]; ints[0] = zero;
#	Line 393 | Line 379 | public class SynchronousQueueTest extend
379		/**
380		* removeAll returns false
381		*/
382	<	public void testRemoveAll() {
383	<	SynchronousQueue q = new SynchronousQueue();
382	>	public void testRemoveAll()      { testRemoveAll(false); }
383	>	public void testRemoveAll_fair() { testRemoveAll(true); }
384	>	public void testRemoveAll(boolean fair) {
385	>	final SynchronousQueue q = new SynchronousQueue(fair);
386		Integer[] empty = new Integer[0];
387		assertFalse(q.removeAll(Arrays.asList(empty)));
388		Integer[] ints = new Integer[1]; ints[0] = zero;
389		assertFalse(q.containsAll(Arrays.asList(ints)));
390		}
391
404	–
392		/**
393		* toArray is empty
394		*/
395	<	public void testToArray() {
396	<	SynchronousQueue q = new SynchronousQueue();
397	<	Object[] o = q.toArray();
398	<	assertEquals(o.length, 0);
395	>	public void testToArray()      { testToArray(false); }
396	>	public void testToArray_fair() { testToArray(true); }
397	>	public void testToArray(boolean fair) {
398	>	final SynchronousQueue q = new SynchronousQueue(fair);
399	>	Object[] o = q.toArray();
400	>	assertEquals(0, o.length);
401		}
402
403		/**
404	<	* toArray(a) is nulled at position 0
404	>	* toArray(Integer array) returns its argument with the first
405	>	* element (if present) nulled out
406		*/
407	<	public void testToArray2() {
408	<	SynchronousQueue q = new SynchronousQueue();
409	<	Integer[] ints = new Integer[1];
410	<	assertNull(ints[0]);
407	>	public void testToArray2()      { testToArray2(false); }
408	>	public void testToArray2_fair() { testToArray2(true); }
409	>	public void testToArray2(boolean fair) {
410	>	final SynchronousQueue<Integer> q = new SynchronousQueue<>(fair);
411	>	Integer[] a;
412	>
413	>	a = new Integer[0];
414	>	assertSame(a, q.toArray(a));
415	>
416	>	a = new Integer[3];
417	>	Arrays.fill(a, 42);
418	>	assertSame(a, q.toArray(a));
419	>	assertNull(a[0]);
420	>	for (int i = 1; i < a.length; i++)
421	>	assertEquals(42, (int) a[i]);
422		}
423	<
423	>
424		/**
425	<	* iterator does not traverse any elements
425	>	* toArray(null) throws NPE
426		*/
427	<	public void testIterator() {
428	<	SynchronousQueue q = new SynchronousQueue();
429	<	Iterator it = q.iterator();
430	<	assertFalse(it.hasNext());
427	>	public void testToArray_null()      { testToArray_null(false); }
428	>	public void testToArray_null_fair() { testToArray_null(true); }
429	>	public void testToArray_null(boolean fair) {
430	>	final SynchronousQueue q = new SynchronousQueue(fair);
431		try {
432	<	Object x = it.next();
432	>	Object[] o = q.toArray(null);
433		shouldThrow();
434	<	}
435	<	catch (NoSuchElementException success) {}
434	>	} catch (NullPointerException success) {}
435	>	}
436	>
437	>	/**
438	>	* iterator does not traverse any elements
439	>	*/
440	>	public void testIterator()      { testIterator(false); }
441	>	public void testIterator_fair() { testIterator(true); }
442	>	public void testIterator(boolean fair) {
443	>	assertIteratorExhausted(new SynchronousQueue(fair).iterator());
444		}
445
446		/**
447		* iterator remove throws ISE
448		*/
449	<	public void testIteratorRemove() {
450	<	SynchronousQueue q = new SynchronousQueue();
451	<	Iterator it = q.iterator();
449	>	public void testIteratorRemove()      { testIteratorRemove(false); }
450	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
451	>	public void testIteratorRemove(boolean fair) {
452	>	final SynchronousQueue q = new SynchronousQueue(fair);
453	>	Iterator it = q.iterator();
454		try {
455		it.remove();
456		shouldThrow();
457	<	}
447	<	catch (IllegalStateException success) {}
457	>	} catch (IllegalStateException success) {}
458		}
459
460		/**
461		* toString returns a non-null string
462		*/
463	<	public void testToString() {
464	<	SynchronousQueue q = new SynchronousQueue();
463	>	public void testToString()      { testToString(false); }
464	>	public void testToString_fair() { testToString(true); }
465	>	public void testToString(boolean fair) {
466	>	final SynchronousQueue q = new SynchronousQueue(fair);
467		String s = q.toString();
468		assertNotNull(s);
469	<	}
458	<
469	>	}
470
471		/**
472		* offer transfers elements across Executor tasks
473		*/
474	<	public void testOfferInExecutor() {
475	<	final SynchronousQueue q = new SynchronousQueue();
476	<	ExecutorService executor = Executors.newFixedThreadPool(2);
477	<	final Integer one = new Integer(1);
478	<
479	<	executor.execute(new Runnable() {
480	<	public void run() {
481	<	threadAssertFalse(q.offer(one));
482	<	try {
483	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
484	<	threadAssertEquals(0, q.remainingCapacity());
485	<	}
486	<	catch (InterruptedException e) {
487	<	threadUnexpectedException();
488	<	}
478	<	}
479	<	});
480	<
481	<	executor.execute(new Runnable() {
482	<	public void run() {
483	<	try {
484	<	Thread.sleep(SMALL_DELAY_MS);
485	<	threadAssertEquals(one, q.take());
486	<	}
487	<	catch (InterruptedException e) {
488	<	threadUnexpectedException();
489	<	}
490	<	}
491	<	});
492	<
493	<	joinPool(executor);
474	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
475	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
476	>	public void testOfferInExecutor(boolean fair) {
477	>	final SynchronousQueue q = new SynchronousQueue(fair);
478	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
479	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
480	>	try (PoolCleaner cleaner = cleaner(executor)) {
481	>
482	>	executor.execute(new CheckedRunnable() {
483	>	public void realRun() throws InterruptedException {
484	>	assertFalse(q.offer(one));
485	>	threadsStarted.await();
486	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
487	>	assertEquals(0, q.remainingCapacity());
488	>	}});
489
490	+	executor.execute(new CheckedRunnable() {
491	+	public void realRun() throws InterruptedException {
492	+	threadsStarted.await();
493	+	assertSame(one, q.take());
494	+	}});
495	+	}
496		}
497
498		/**
499	<	* poll retrieves elements across Executor threads
499	>	* timed poll retrieves elements across Executor threads
500		*/
501	<	public void testPollInExecutor() {
502	<	final SynchronousQueue q = new SynchronousQueue();
503	<	ExecutorService executor = Executors.newFixedThreadPool(2);
504	<	executor.execute(new Runnable() {
505	<	public void run() {
506	<	threadAssertNull(q.poll());
507	<	try {
508	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
509	<	threadAssertTrue(q.isEmpty());
510	<	}
511	<	catch (InterruptedException e) {
512	<	threadUnexpectedException();
513	<	}
514	<	}
514	<	});
501	>	public void testPollInExecutor()      { testPollInExecutor(false); }
502	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
503	>	public void testPollInExecutor(boolean fair) {
504	>	final SynchronousQueue q = new SynchronousQueue(fair);
505	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
506	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
507	>	try (PoolCleaner cleaner = cleaner(executor)) {
508	>	executor.execute(new CheckedRunnable() {
509	>	public void realRun() throws InterruptedException {
510	>	assertNull(q.poll());
511	>	threadsStarted.await();
512	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
513	>	assertTrue(q.isEmpty());
514	>	}});
515
516	<	executor.execute(new Runnable() {
517	<	public void run() {
518	<	try {
519	<	Thread.sleep(SMALL_DELAY_MS);
520	<	q.put(new Integer(1));
521	<	}
522	<	catch (InterruptedException e) {
523	<	threadUnexpectedException();
524	<	}
525	<	}
526	<	});
527	<
528	<	joinPool(executor);
516	>	executor.execute(new CheckedRunnable() {
517	>	public void realRun() throws InterruptedException {
518	>	threadsStarted.await();
519	>	q.put(one);
520	>	}});
521	>	}
522		}
523
524		/**
525		* a deserialized serialized queue is usable
526		*/
527		public void testSerialization() {
528	<	SynchronousQueue q = new SynchronousQueue();
529	<	try {
530	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
531	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
532	<	out.writeObject(q);
533	<	out.close();
534	<
535	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
536	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
537	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
538	<	assertEquals(q.size(), r.size());
539	<	while (!q.isEmpty())
540	<	assertEquals(q.remove(), r.remove());
541	<	} catch(Exception e){
542	<	unexpectedException();
528	>	final SynchronousQueue x = new SynchronousQueue();
529	>	final SynchronousQueue y = new SynchronousQueue(false);
530	>	final SynchronousQueue z = new SynchronousQueue(true);
531	>	assertSerialEquals(x, y);
532	>	assertNotSerialEquals(x, z);
533	>	SynchronousQueue[] qs = { x, y, z };
534	>	for (SynchronousQueue q : qs) {
535	>	SynchronousQueue clone = serialClone(q);
536	>	assertNotSame(q, clone);
537	>	assertSerialEquals(q, clone);
538	>	assertTrue(clone.isEmpty());
539	>	assertEquals(0, clone.size());
540	>	assertEquals(0, clone.remainingCapacity());
541	>	assertFalse(clone.offer(zero));
542	>	}
543	>	}
544	>
545	>	/**
546	>	* drainTo(c) of empty queue doesn't transfer elements
547	>	*/
548	>	public void testDrainTo()      { testDrainTo(false); }
549	>	public void testDrainTo_fair() { testDrainTo(true); }
550	>	public void testDrainTo(boolean fair) {
551	>	final SynchronousQueue q = new SynchronousQueue(fair);
552	>	ArrayList l = new ArrayList();
553	>	q.drainTo(l);
554	>	assertEquals(0, q.size());
555	>	assertEquals(0, l.size());
556	>	}
557	>
558	>	/**
559	>	* drainTo empties queue, unblocking a waiting put.
560	>	*/
561	>	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
562	>	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
563	>	public void testDrainToWithActivePut(boolean fair) {
564	>	final SynchronousQueue q = new SynchronousQueue(fair);
565	>	Thread t = newStartedThread(new CheckedRunnable() {
566	>	public void realRun() throws InterruptedException {
567	>	q.put(one);
568	>	}});
569	>
570	>	ArrayList l = new ArrayList();
571	>	long startTime = System.nanoTime();
572	>	while (l.isEmpty()) {
573	>	q.drainTo(l);
574	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
575	>	fail("timed out");
576	>	Thread.yield();
577		}
578	+	assertEquals(1, l.size());
579	+	assertSame(one, l.get(0));
580	+	awaitTermination(t);
581	+	}
582	+
583	+	/**
584	+	* drainTo(c, n) empties up to n elements of queue into c
585	+	*/
586	+	public void testDrainToN() throws InterruptedException {
587	+	final SynchronousQueue q = new SynchronousQueue();
588	+	Thread t1 = newStartedThread(new CheckedRunnable() {
589	+	public void realRun() throws InterruptedException {
590	+	q.put(one);
591	+	}});
592	+
593	+	Thread t2 = newStartedThread(new CheckedRunnable() {
594	+	public void realRun() throws InterruptedException {
595	+	q.put(two);
596	+	}});
597	+
598	+	ArrayList l = new ArrayList();
599	+	int drained;
600	+	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
601	+	assertEquals(1, drained);
602	+	assertEquals(1, l.size());
603	+	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
604	+	assertEquals(1, drained);
605	+	assertEquals(2, l.size());
606	+	assertTrue(l.contains(one));
607	+	assertTrue(l.contains(two));
608	+	awaitTermination(t1);
609	+	awaitTermination(t2);
610	+	}
611	+
612	+	/**
613	+	* remove(null), contains(null) always return false
614	+	*/
615	+	public void testNeverContainsNull() {
616	+	Collection<?> q = new SynchronousQueue();
617	+	assertFalse(q.contains(null));
618	+	assertFalse(q.remove(null));
619		}
620
621		}

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