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Comparing jsr166/src/test/tck/SynchronousQueueTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.65 by jsr166, Tue Aug 13 23:06:39 2019 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
10	<	import java.util.*;
11	<	import java.util.concurrent.*;
12	<	import java.io.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	>
11	>	import java.util.ArrayList;
12	>	import java.util.Arrays;
13	>	import java.util.Collection;
14	>	import java.util.Iterator;
15	>	import java.util.NoSuchElementException;
16	>	import java.util.concurrent.BlockingQueue;
17	>	import java.util.concurrent.CountDownLatch;
18	>	import java.util.concurrent.Executors;
19	>	import java.util.concurrent.ExecutorService;
20	>	import java.util.concurrent.SynchronousQueue;
21	>
22	>	import junit.framework.Test;
23
24		public class SynchronousQueueTest extends JSR166TestCase {
25
26	+	public static class Fair extends BlockingQueueTest {
27	+	protected BlockingQueue emptyCollection() {
28	+	return new SynchronousQueue(true);
29	+	}
30	+	}
31	+
32	+	public static class NonFair extends BlockingQueueTest {
33	+	protected BlockingQueue emptyCollection() {
34	+	return new SynchronousQueue(false);
35	+	}
36	+	}
37	+
38		public static void main(String[] args) {
39	<	junit.textui.TestRunner.run (suite());
39	>	main(suite(), args);
40		}
41
42		public static Test suite() {
43	<	return new TestSuite(SynchronousQueueTest.class);
43	>	return newTestSuite(SynchronousQueueTest.class,
44	>	new Fair().testSuite(),
45	>	new NonFair().testSuite());
46		}
47
48	<	public void testEmptyFull() {
49	<	SynchronousQueue q = new SynchronousQueue();
48	>	/**
49	>	* Any SynchronousQueue is both empty and full
50	>	*/
51	>	public void testEmptyFull()      { testEmptyFull(false); }
52	>	public void testEmptyFull_fair() { testEmptyFull(true); }
53	>	public void testEmptyFull(boolean fair) {
54	>	final SynchronousQueue q = new SynchronousQueue(fair);
55		assertTrue(q.isEmpty());
56	<	assertEquals(0, q.size());
56	>	assertEquals(0, q.size());
57		assertEquals(0, q.remainingCapacity());
58	<	assertFalse(q.offer(new Integer(3)));
58	>	assertFalse(q.offer(zero));
59		}
60
61	<	public void testOfferNull(){
62	<	try {
63	<	SynchronousQueue q = new SynchronousQueue();
64	<	q.offer(null);
65	<	fail("should throw NPE");
66	<	} catch (NullPointerException success) { }
67	<	}
61	>	/**
62	>	* offer fails if no active taker
63	>	*/
64	>	public void testOffer()      { testOffer(false); }
65	>	public void testOffer_fair() { testOffer(true); }
66	>	public void testOffer(boolean fair) {
67	>	SynchronousQueue q = new SynchronousQueue(fair);
68	>	assertFalse(q.offer(one));
69	>	}
70	>
71	>	/**
72	>	* add throws IllegalStateException if no active taker
73	>	*/
74	>	public void testAdd()      { testAdd(false); }
75	>	public void testAdd_fair() { testAdd(true); }
76	>	public void testAdd(boolean fair) {
77	>	SynchronousQueue q = new SynchronousQueue(fair);
78	>	assertEquals(0, q.remainingCapacity());
79	>	try {
80	>	q.add(one);
81	>	shouldThrow();
82	>	} catch (IllegalStateException success) {}
83	>	}
84	>
85	>	/**
86	>	* addAll(this) throws IllegalArgumentException
87	>	*/
88	>	public void testAddAll_self()      { testAddAll_self(false); }
89	>	public void testAddAll_self_fair() { testAddAll_self(true); }
90	>	public void testAddAll_self(boolean fair) {
91	>	SynchronousQueue q = new SynchronousQueue(fair);
92	>	try {
93	>	q.addAll(q);
94	>	shouldThrow();
95	>	} catch (IllegalArgumentException success) {}
96	>	}
97	>
98	>	/**
99	>	* addAll throws IllegalStateException if no active taker
100	>	*/
101	>	public void testAddAll_ISE()      { testAddAll_ISE(false); }
102	>	public void testAddAll_ISE_fair() { testAddAll_ISE(true); }
103	>	public void testAddAll_ISE(boolean fair) {
104	>	SynchronousQueue q = new SynchronousQueue(fair);
105	>	Integer[] ints = new Integer[1];
106	>	for (int i = 0; i < ints.length; i++)
107	>	ints[i] = i;
108	>	Collection<Integer> coll = Arrays.asList(ints);
109	>	try {
110	>	q.addAll(coll);
111	>	shouldThrow();
112	>	} catch (IllegalStateException success) {}
113	>	}
114	>
115	>	/**
116	>	* put blocks interruptibly if no active taker
117	>	*/
118	>	public void testBlockingPut()      { testBlockingPut(false); }
119	>	public void testBlockingPut_fair() { testBlockingPut(true); }
120	>	public void testBlockingPut(boolean fair) {
121	>	final SynchronousQueue q = new SynchronousQueue(fair);
122	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
123	>	Thread t = newStartedThread(new CheckedRunnable() {
124	>	public void realRun() throws InterruptedException {
125	>	Thread.currentThread().interrupt();
126	>	try {
127	>	q.put(99);
128	>	shouldThrow();
129	>	} catch (InterruptedException success) {}
130	>	assertFalse(Thread.interrupted());
131
132	<	public void testOffer(){
133	<	SynchronousQueue q = new SynchronousQueue();
134	<	assertFalse(q.offer(new Integer(1)));
132	>	pleaseInterrupt.countDown();
133	>	try {
134	>	q.put(99);
135	>	shouldThrow();
136	>	} catch (InterruptedException success) {}
137	>	assertFalse(Thread.interrupted());
138	>	}});
139	>
140	>	await(pleaseInterrupt);
141	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
142	>	t.interrupt();
143	>	awaitTermination(t);
144	>	assertEquals(0, q.remainingCapacity());
145		}
146
147	<	public void testAdd(){
148	<	try {
149	<	SynchronousQueue q = new SynchronousQueue();
150	<	assertEquals(0, q.remainingCapacity());
151	<	q.add(new Integer(0));
152	<	} catch (IllegalStateException success){
153	<	}
154	<	}
147	>	/**
148	>	* put blocks interruptibly waiting for take
149	>	*/
150	>	public void testPutWithTake()      { testPutWithTake(false); }
151	>	public void testPutWithTake_fair() { testPutWithTake(true); }
152	>	public void testPutWithTake(boolean fair) {
153	>	final SynchronousQueue q = new SynchronousQueue(fair);
154	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
155	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
156	>	Thread t = newStartedThread(new CheckedRunnable() {
157	>	public void realRun() throws InterruptedException {
158	>	pleaseTake.countDown();
159	>	q.put(one);
160
161	<	public void testAddAll1(){
162	<	try {
163	<	SynchronousQueue q = new SynchronousQueue();
164	<	q.addAll(null);
165	<	fail("Cannot add null collection");
166	<	}
59	<	catch (NullPointerException success) {}
60	<	}
61	<	public void testAddAll2(){
62	<	try {
63	<	SynchronousQueue q = new SynchronousQueue();
64	<	Integer[] ints = new Integer[1];
65	<	q.addAll(Arrays.asList(ints));
66	<	fail("Cannot add null elements");
67	<	}
68	<	catch (NullPointerException success) {}
69	<	}
70	<	public void testAddAll4(){
71	<	try {
72	<	SynchronousQueue q = new SynchronousQueue();
73	<	Integer[] ints = new Integer[1];
74	<	for (int i = 0; i < 1; ++i)
75	<	ints[i] = new Integer(i);
76	<	q.addAll(Arrays.asList(ints));
77	<	fail("Cannot add with insufficient capacity");
78	<	}
79	<	catch (IllegalStateException success) {}
80	<	}
161	>	Thread.currentThread().interrupt();
162	>	try {
163	>	q.put(99);
164	>	shouldThrow();
165	>	} catch (InterruptedException success) {}
166	>	assertFalse(Thread.interrupted());
167
168	<	public void testPutNull() {
169	<	try {
170	<	SynchronousQueue q = new SynchronousQueue();
171	<	q.put(null);
172	<	fail("put should throw NPE");
173	<	}
174	<	catch (NullPointerException success){
89	<	}
90	<	catch (InterruptedException ie) {
91	<	fail("Unexpected exception");
92	<	}
93	<	}
168	>	pleaseInterrupt.countDown();
169	>	try {
170	>	q.put(99);
171	>	shouldThrow();
172	>	} catch (InterruptedException success) {}
173	>	assertFalse(Thread.interrupted());
174	>	}});
175
176	<	public void testBlockingPut(){
177	<	Thread t = new Thread(new Runnable() {
178	<	public void run() {
179	<	try {
99	<	SynchronousQueue q = new SynchronousQueue();
100	<	q.put(new Integer(0));
101	<	threadFail("put should block");
102	<	} catch (InterruptedException ie){
103	<	}
104	<	}});
105	<	t.start();
106	<	try {
107	<	Thread.sleep(SHORT_DELAY_MS);
108	<	t.interrupt();
109	<	t.join();
110	<	}
111	<	catch (InterruptedException ie) {
112	<	fail("Unexpected exception");
113	<	}
114	<	}
176	>	await(pleaseTake);
177	>	assertEquals(0, q.remainingCapacity());
178	>	try { assertSame(one, q.take()); }
179	>	catch (InterruptedException e) { threadUnexpectedException(e); }
180
181	<	public void testPutWithTake() {
182	<	final SynchronousQueue q = new SynchronousQueue();
183	<	Thread t = new Thread(new Runnable() {
184	<	public void run(){
185	<	int added = 0;
121	<	try {
122	<	q.put(new Object());
123	<	++added;
124	<	q.put(new Object());
125	<	++added;
126	<	q.put(new Object());
127	<	++added;
128	<	q.put(new Object());
129	<	++added;
130	<	threadFail("Should block");
131	<	} catch (InterruptedException e){
132	<	assertTrue(added >= 1);
133	<	}
134	<	}
135	<	});
136	<	try {
137	<	t.start();
138	<	Thread.sleep(SHORT_DELAY_MS);
139	<	q.take();
140	<	Thread.sleep(SHORT_DELAY_MS);
141	<	t.interrupt();
142	<	t.join();
143	<	} catch (Exception e){
144	<	fail("Unexpected exception");
145	<	}
181	>	await(pleaseInterrupt);
182	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
183	>	t.interrupt();
184	>	awaitTermination(t);
185	>	assertEquals(0, q.remainingCapacity());
186		}
187
188	+	/**
189	+	* timed offer times out if elements not taken
190	+	*/
191		public void testTimedOffer() {
192	<	final SynchronousQueue q = new SynchronousQueue();
193	<	Thread t = new Thread(new Runnable() {
194	<	public void run(){
195	<	try {
196	<
197	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
155	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
156	<	threadFail("Should block");
157	<	} catch (InterruptedException success){}
158	<	}
159	<	});
160	<
161	<	try {
162	<	t.start();
163	<	Thread.sleep(SMALL_DELAY_MS);
164	<	t.interrupt();
165	<	t.join();
166	<	} catch (Exception e){
167	<	fail("Unexpected exception");
168	<	}
169	<	}
170	<
171	<
172	<	public void testTakeFromEmpty() {
173	<	final SynchronousQueue q = new SynchronousQueue();
174	<	Thread t = new Thread(new Runnable() {
175	<	public void run(){
176	<	try {
177	<	q.take();
178	<	threadFail("Should block");
179	<	} catch (InterruptedException success){ }
180	<	}
181	<	});
182	<	try {
183	<	t.start();
184	<	Thread.sleep(SHORT_DELAY_MS);
185	<	t.interrupt();
186	<	t.join();
187	<	} catch (Exception e){
188	<	fail("Unexpected exception");
189	<	}
190	<	}
192	>	final boolean fair = randomBoolean();
193	>	final SynchronousQueue q = new SynchronousQueue(fair);
194	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
195	>	Thread t = newStartedThread(new CheckedRunnable() {
196	>	public void realRun() throws InterruptedException {
197	>	long startTime = System.nanoTime();
198
199	<	public void testPoll(){
200	<	SynchronousQueue q = new SynchronousQueue();
194	<	assertNull(q.poll());
195	<	}
199	>	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
200	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
201
202	<	public void testTimedPoll0() {
203	<	try {
204	<	SynchronousQueue q = new SynchronousQueue();
205	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
206	<	} catch (InterruptedException e){
207	<	fail("Unexpected exception");
203	<	}
204	<	}
202	>	Thread.currentThread().interrupt();
203	>	try {
204	>	q.offer(new Object(), randomTimeout(), randomTimeUnit());
205	>	shouldThrow();
206	>	} catch (InterruptedException success) {}
207	>	assertFalse(Thread.interrupted());
208
209	+	pleaseInterrupt.countDown();
210	+	try {
211	+	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
212	+	shouldThrow();
213	+	} catch (InterruptedException success) {}
214	+	assertFalse(Thread.interrupted());
215	+
216	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
217	+	}});
218	+
219	+	await(pleaseInterrupt);
220	+	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
221	+	t.interrupt();
222	+	awaitTermination(t);
223	+	}
224	+
225	+	/**
226	+	* poll return null if no active putter
227	+	*/
228	+	public void testPoll()      { testPoll(false); }
229	+	public void testPoll_fair() { testPoll(true); }
230	+	public void testPoll(boolean fair) {
231	+	final SynchronousQueue q = new SynchronousQueue(fair);
232	+	assertNull(q.poll());
233	+	}
234	+
235	+	/**
236	+	* timed poll with zero timeout times out if no active putter
237	+	*/
238	+	public void testTimedPoll0()      { testTimedPoll0(false); }
239	+	public void testTimedPoll0_fair() { testTimedPoll0(true); }
240	+	public void testTimedPoll0(boolean fair) {
241	+	final SynchronousQueue q = new SynchronousQueue(fair);
242	+	try { assertNull(q.poll(0, MILLISECONDS)); }
243	+	catch (InterruptedException e) { threadUnexpectedException(e); }
244	+	}
245	+
246	+	/**
247	+	* timed poll with nonzero timeout times out if no active putter
248	+	*/
249		public void testTimedPoll() {
250	<	try {
251	<	SynchronousQueue q = new SynchronousQueue();
252	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
253	<	} catch (InterruptedException e){
254	<	fail("Unexpected exception");
255	<	}
256	<	}
257	<
258	<	public void testInterruptedTimedPoll(){
259	<	Thread t = new Thread(new Runnable() {
260	<	public void run() {
261	<	try {
262	<	SynchronousQueue q = new SynchronousQueue();
263	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
264	<	} catch (InterruptedException success){
265	<	}
266	<	}});
267	<	t.start();
268	<	try {
269	<	Thread.sleep(SHORT_DELAY_MS);
270	<	t.interrupt();
271	<	t.join();
272	<	}
273	<	catch (InterruptedException ie) {
274	<	fail("Unexpected exception");
275	<	}
233	<	}
250	>	final boolean fair = randomBoolean();
251	>	final SynchronousQueue q = new SynchronousQueue(fair);
252	>	final long startTime = System.nanoTime();
253	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
254	>	catch (InterruptedException e) { threadUnexpectedException(e); }
255	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
256	>	}
257	>
258	>	/**
259	>	* timed poll before a delayed offer times out, returning null;
260	>	* after offer succeeds; on interruption throws
261	>	*/
262	>	public void testTimedPollWithOffer() {
263	>	final boolean fair = randomBoolean();
264	>	final SynchronousQueue q = new SynchronousQueue(fair);
265	>	final CountDownLatch pleaseOffer = new CountDownLatch(1);
266	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
267	>	Thread t = newStartedThread(new CheckedRunnable() {
268	>	public void realRun() throws InterruptedException {
269	>	long startTime = System.nanoTime();
270	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
271	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
272	>
273	>	pleaseOffer.countDown();
274	>	startTime = System.nanoTime();
275	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
276
277	<	public void testTimedPollWithOffer(){
278	<	final SynchronousQueue q = new SynchronousQueue();
279	<	Thread t = new Thread(new Runnable() {
280	<	public void run(){
281	<	try {
282	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
241	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
242	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
243	<	threadFail("Should block");
244	<	} catch (InterruptedException success) { }
245	<	}
246	<	});
247	<	try {
248	<	t.start();
249	<	Thread.sleep(SMALL_DELAY_MS);
250	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
251	<	t.interrupt();
252	<	t.join();
253	<	} catch (Exception e){
254	<	fail("Unexpected exception");
255	<	}
256	<	}
257	<
258	<
259	<	public void testPeek(){
260	<	SynchronousQueue q = new SynchronousQueue();
261	<	assertNull(q.peek());
262	<	}
277	>	Thread.currentThread().interrupt();
278	>	try {
279	>	q.poll(randomTimeout(), randomTimeUnit());
280	>	shouldThrow();
281	>	} catch (InterruptedException success) {}
282	>	assertFalse(Thread.interrupted());
283
284	<	public void testElement(){
285	<	SynchronousQueue q = new SynchronousQueue();
284	>	pleaseInterrupt.countDown();
285	>	try {
286	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
287	>	shouldThrow();
288	>	} catch (InterruptedException success) {}
289	>	assertFalse(Thread.interrupted());
290	>
291	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
292	>	}});
293	>
294	>	await(pleaseOffer);
295	>	long startTime = System.nanoTime();
296	>	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
297	>	catch (InterruptedException e) { threadUnexpectedException(e); }
298	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
299	>
300	>	await(pleaseInterrupt);
301	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
302	>	t.interrupt();
303	>	awaitTermination(t);
304	>	}
305	>
306	>	/**
307	>	* peek() returns null if no active putter
308	>	*/
309	>	public void testPeek()      { testPeek(false); }
310	>	public void testPeek_fair() { testPeek(true); }
311	>	public void testPeek(boolean fair) {
312	>	final SynchronousQueue q = new SynchronousQueue(fair);
313	>	assertNull(q.peek());
314	>	}
315	>
316	>	/**
317	>	* element() throws NoSuchElementException if no active putter
318	>	*/
319	>	public void testElement()      { testElement(false); }
320	>	public void testElement_fair() { testElement(true); }
321	>	public void testElement(boolean fair) {
322	>	final SynchronousQueue q = new SynchronousQueue(fair);
323		try {
324		q.element();
325	<	fail("no such element");
326	<	}
270	<	catch (NoSuchElementException success) {}
325	>	shouldThrow();
326	>	} catch (NoSuchElementException success) {}
327		}
328
329	<	public void testRemove(){
330	<	SynchronousQueue q = new SynchronousQueue();
329	>	/**
330	>	* remove() throws NoSuchElementException if no active putter
331	>	*/
332	>	public void testRemove()      { testRemove(false); }
333	>	public void testRemove_fair() { testRemove(true); }
334	>	public void testRemove(boolean fair) {
335	>	final SynchronousQueue q = new SynchronousQueue(fair);
336		try {
337		q.remove();
338	<	fail("remove should throw");
339	<	} catch (NoSuchElementException success){
279	<	}
280	<	}
281	<
282	<	public void testRemoveElement(){
283	<	SynchronousQueue q = new SynchronousQueue();
284	<	assertFalse(q.remove(new Integer(0)));
285	<	assertTrue(q.isEmpty());
286	<	}
287	<
288	<	public void testContains(){
289	<	SynchronousQueue q = new SynchronousQueue();
290	<	assertFalse(q.contains(new Integer(0)));
338	>	shouldThrow();
339	>	} catch (NoSuchElementException success) {}
340		}
341
342	<	public void testClear(){
343	<	SynchronousQueue q = new SynchronousQueue();
342	>	/**
343	>	* contains returns false
344	>	*/
345	>	public void testContains()      { testContains(false); }
346	>	public void testContains_fair() { testContains(true); }
347	>	public void testContains(boolean fair) {
348	>	final SynchronousQueue q = new SynchronousQueue(fair);
349	>	assertFalse(q.contains(zero));
350	>	}
351	>
352	>	/**
353	>	* clear ensures isEmpty
354	>	*/
355	>	public void testClear()      { testClear(false); }
356	>	public void testClear_fair() { testClear(true); }
357	>	public void testClear(boolean fair) {
358	>	final SynchronousQueue q = new SynchronousQueue(fair);
359		q.clear();
360		assertTrue(q.isEmpty());
361		}
362
363	<	public void testContainsAll(){
364	<	SynchronousQueue q = new SynchronousQueue();
363	>	/**
364	>	* containsAll returns false unless empty
365	>	*/
366	>	public void testContainsAll()      { testContainsAll(false); }
367	>	public void testContainsAll_fair() { testContainsAll(true); }
368	>	public void testContainsAll(boolean fair) {
369	>	final SynchronousQueue q = new SynchronousQueue(fair);
370		Integer[] empty = new Integer[0];
371	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
372	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
371	>	assertTrue(q.containsAll(Arrays.asList(empty)));
372	>	Integer[] ints = new Integer[1]; ints[0] = zero;
373		assertFalse(q.containsAll(Arrays.asList(ints)));
374		}
375
376	<	public void testRetainAll(){
377	<	SynchronousQueue q = new SynchronousQueue();
376	>	/**
377	>	* retainAll returns false
378	>	*/
379	>	public void testRetainAll()      { testRetainAll(false); }
380	>	public void testRetainAll_fair() { testRetainAll(true); }
381	>	public void testRetainAll(boolean fair) {
382	>	final SynchronousQueue q = new SynchronousQueue(fair);
383		Integer[] empty = new Integer[0];
384	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
385	<	q.retainAll(Arrays.asList(ints));
386	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
313	<	assertFalse(q.containsAll(Arrays.asList(ints)));
384	>	assertFalse(q.retainAll(Arrays.asList(empty)));
385	>	Integer[] ints = new Integer[1]; ints[0] = zero;
386	>	assertFalse(q.retainAll(Arrays.asList(ints)));
387		}
388
389	<	public void testRemoveAll(){
390	<	SynchronousQueue q = new SynchronousQueue();
389	>	/**
390	>	* removeAll returns false
391	>	*/
392	>	public void testRemoveAll()      { testRemoveAll(false); }
393	>	public void testRemoveAll_fair() { testRemoveAll(true); }
394	>	public void testRemoveAll(boolean fair) {
395	>	final SynchronousQueue q = new SynchronousQueue(fair);
396		Integer[] empty = new Integer[0];
397	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
398	<	q.removeAll(Arrays.asList(ints));
321	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
397	>	assertFalse(q.removeAll(Arrays.asList(empty)));
398	>	Integer[] ints = new Integer[1]; ints[0] = zero;
399		assertFalse(q.containsAll(Arrays.asList(ints)));
400		}
401
402	<
403	<	public void testToArray(){
404	<	SynchronousQueue q = new SynchronousQueue();
405	<	Object[] o = q.toArray();
406	<	assertEquals(o.length, 0);
407	<	}
408	<
409	<	public void testToArray2(){
410	<	SynchronousQueue q = new SynchronousQueue();
411	<	Integer[] ints = new Integer[1];
412	<	assertNull(ints[0]);
413	<	}
414	<
415	<	public void testIterator(){
416	<	SynchronousQueue q = new SynchronousQueue();
417	<	Iterator it = q.iterator();
418	<	assertFalse(it.hasNext());
419	<	try {
420	<	Object x = it.next();
421	<	fail("should throw");
422	<	}
423	<	catch (NoSuchElementException success) {}
424	<	}
425	<
426	<	public void testIteratorRemove(){
427	<	SynchronousQueue q = new SynchronousQueue();
428	<	Iterator it = q.iterator();
402	>	/**
403	>	* toArray is empty
404	>	*/
405	>	public void testToArray()      { testToArray(false); }
406	>	public void testToArray_fair() { testToArray(true); }
407	>	public void testToArray(boolean fair) {
408	>	final SynchronousQueue q = new SynchronousQueue(fair);
409	>	Object[] o = q.toArray();
410	>	assertEquals(0, o.length);
411	>	}
412	>
413	>	/**
414	>	* toArray(Integer array) returns its argument with the first
415	>	* element (if present) nulled out
416	>	*/
417	>	public void testToArray2()      { testToArray2(false); }
418	>	public void testToArray2_fair() { testToArray2(true); }
419	>	public void testToArray2(boolean fair) {
420	>	final SynchronousQueue<Integer> q = new SynchronousQueue<>(fair);
421	>	Integer[] a;
422	>
423	>	a = new Integer[0];
424	>	assertSame(a, q.toArray(a));
425	>
426	>	a = new Integer[3];
427	>	Arrays.fill(a, 42);
428	>	assertSame(a, q.toArray(a));
429	>	assertNull(a[0]);
430	>	for (int i = 1; i < a.length; i++)
431	>	assertEquals(42, (int) a[i]);
432	>	}
433	>
434	>	/**
435	>	* toArray(null) throws NPE
436	>	*/
437	>	public void testToArray_null()      { testToArray_null(false); }
438	>	public void testToArray_null_fair() { testToArray_null(true); }
439	>	public void testToArray_null(boolean fair) {
440	>	final SynchronousQueue q = new SynchronousQueue(fair);
441	>	try {
442	>	Object[] o = q.toArray((Object[])null);
443	>	shouldThrow();
444	>	} catch (NullPointerException success) {}
445	>	}
446	>
447	>	/**
448	>	* iterator does not traverse any elements
449	>	*/
450	>	public void testIterator()      { testIterator(false); }
451	>	public void testIterator_fair() { testIterator(true); }
452	>	public void testIterator(boolean fair) {
453	>	assertIteratorExhausted(new SynchronousQueue(fair).iterator());
454	>	}
455	>
456	>	/**
457	>	* iterator remove throws IllegalStateException
458	>	*/
459	>	public void testIteratorRemove()      { testIteratorRemove(false); }
460	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
461	>	public void testIteratorRemove(boolean fair) {
462	>	final SynchronousQueue q = new SynchronousQueue(fair);
463	>	Iterator it = q.iterator();
464		try {
465		it.remove();
466	<	fail("should throw");
467	<	}
356	<	catch (IllegalStateException success) {}
466	>	shouldThrow();
467	>	} catch (IllegalStateException success) {}
468		}
469
470	<	public void testToString(){
471	<	SynchronousQueue q = new SynchronousQueue();
470	>	/**
471	>	* toString returns a non-null string
472	>	*/
473	>	public void testToString()      { testToString(false); }
474	>	public void testToString_fair() { testToString(true); }
475	>	public void testToString(boolean fair) {
476	>	final SynchronousQueue q = new SynchronousQueue(fair);
477		String s = q.toString();
478	<	assertTrue(s != null);
363	<	}
364	<
365	<
366	<	public void testOfferInExecutor() {
367	<	final SynchronousQueue q = new SynchronousQueue();
368	<	ExecutorService executor = Executors.newFixedThreadPool(2);
369	<	final Integer one = new Integer(1);
370	<
371	<	executor.execute(new Runnable() {
372	<	public void run() {
373	<	threadAssertFalse(q.offer(one));
374	<	try {
375	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
376	<	threadAssertEquals(0, q.remainingCapacity());
377	<	}
378	<	catch (InterruptedException e) {
379	<	threadFail("should not be interrupted");
380	<	}
381	<	}
382	<	});
383	<
384	<	executor.execute(new Runnable() {
385	<	public void run() {
386	<	try {
387	<	Thread.sleep(SMALL_DELAY_MS);
388	<	threadAssertEquals(one, q.take());
389	<	}
390	<	catch (InterruptedException e) {
391	<	fail("should not be interrupted");
392	<	}
393	<	}
394	<	});
395	<
396	<	joinPool(executor);
397	<
478	>	assertNotNull(s);
479		}
480
481	<	public void testPollInExecutor() {
482	<
483	<	final SynchronousQueue q = new SynchronousQueue();
484	<
485	<	ExecutorService executor = Executors.newFixedThreadPool(2);
481	>	/**
482	>	* offer transfers elements across Executor tasks
483	>	*/
484	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
485	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
486	>	public void testOfferInExecutor(boolean fair) {
487	>	final SynchronousQueue q = new SynchronousQueue(fair);
488	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
489	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
490	>	try (PoolCleaner cleaner = cleaner(executor)) {
491	>
492	>	executor.execute(new CheckedRunnable() {
493	>	public void realRun() throws InterruptedException {
494	>	assertFalse(q.offer(one));
495	>	threadsStarted.await();
496	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
497	>	assertEquals(0, q.remainingCapacity());
498	>	}});
499
500	<	executor.execute(new Runnable() {
501	<	public void run() {
502	<	threadAssertNull(q.poll());
503	<	try {
504	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
505	<	threadAssertTrue(q.isEmpty());
506	<	}
413	<	catch (InterruptedException e) {
414	<	threadFail("should not be interrupted");
415	<	}
416	<	}
417	<	});
500	>	executor.execute(new CheckedRunnable() {
501	>	public void realRun() throws InterruptedException {
502	>	threadsStarted.await();
503	>	assertSame(one, q.take());
504	>	}});
505	>	}
506	>	}
507
508	<	executor.execute(new Runnable() {
509	<	public void run() {
510	<	try {
511	<	Thread.sleep(SMALL_DELAY_MS);
512	<	q.put(new Integer(1));
513	<	}
514	<	catch (InterruptedException e) {
515	<	threadFail("should not be interrupted");
516	<	}
517	<	}
518	<	});
519	<
520	<	joinPool(executor);
508	>	/**
509	>	* timed poll retrieves elements across Executor threads
510	>	*/
511	>	public void testPollInExecutor()      { testPollInExecutor(false); }
512	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
513	>	public void testPollInExecutor(boolean fair) {
514	>	final SynchronousQueue q = new SynchronousQueue(fair);
515	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
516	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
517	>	try (PoolCleaner cleaner = cleaner(executor)) {
518	>	executor.execute(new CheckedRunnable() {
519	>	public void realRun() throws InterruptedException {
520	>	assertNull(q.poll());
521	>	threadsStarted.await();
522	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
523	>	assertTrue(q.isEmpty());
524	>	}});
525
526	+	executor.execute(new CheckedRunnable() {
527	+	public void realRun() throws InterruptedException {
528	+	threadsStarted.await();
529	+	q.put(one);
530	+	}});
531	+	}
532		}
533
534	+	/**
535	+	* a deserialized/reserialized queue is usable
536	+	*/
537		public void testSerialization() {
538	<	SynchronousQueue q = new SynchronousQueue();
539	<	try {
540	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
541	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
542	<	out.writeObject(q);
543	<	out.close();
544	<
545	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
546	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
547	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
548	<	assertEquals(q.size(), r.size());
549	<	while (!q.isEmpty())
550	<	assertEquals(q.remove(), r.remove());
551	<	} catch(Exception e){
450	<	fail("unexpected exception");
538	>	final SynchronousQueue x = new SynchronousQueue();
539	>	final SynchronousQueue y = new SynchronousQueue(false);
540	>	final SynchronousQueue z = new SynchronousQueue(true);
541	>	assertSerialEquals(x, y);
542	>	assertNotSerialEquals(x, z);
543	>	SynchronousQueue[] qs = { x, y, z };
544	>	for (SynchronousQueue q : qs) {
545	>	SynchronousQueue clone = serialClone(q);
546	>	assertNotSame(q, clone);
547	>	assertSerialEquals(q, clone);
548	>	assertTrue(clone.isEmpty());
549	>	assertEquals(0, clone.size());
550	>	assertEquals(0, clone.remainingCapacity());
551	>	assertFalse(clone.offer(zero));
552		}
553		}
554
555	+	/**
556	+	* drainTo(c) of empty queue doesn't transfer elements
557	+	*/
558	+	public void testDrainTo()      { testDrainTo(false); }
559	+	public void testDrainTo_fair() { testDrainTo(true); }
560	+	public void testDrainTo(boolean fair) {
561	+	final SynchronousQueue q = new SynchronousQueue(fair);
562	+	ArrayList l = new ArrayList();
563	+	q.drainTo(l);
564	+	assertEquals(0, q.size());
565	+	assertEquals(0, l.size());
566	+	}
567	+
568	+	/**
569	+	* drainTo empties queue, unblocking a waiting put.
570	+	*/
571	+	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
572	+	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
573	+	public void testDrainToWithActivePut(boolean fair) {
574	+	final SynchronousQueue q = new SynchronousQueue(fair);
575	+	Thread t = newStartedThread(new CheckedRunnable() {
576	+	public void realRun() throws InterruptedException {
577	+	q.put(one);
578	+	}});
579	+
580	+	ArrayList l = new ArrayList();
581	+	long startTime = System.nanoTime();
582	+	while (l.isEmpty()) {
583	+	q.drainTo(l);
584	+	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
585	+	fail("timed out");
586	+	Thread.yield();
587	+	}
588	+	assertEquals(1, l.size());
589	+	assertSame(one, l.get(0));
590	+	awaitTermination(t);
591	+	}
592	+
593	+	/**
594	+	* drainTo(c, n) empties up to n elements of queue into c
595	+	*/
596	+	public void testDrainToN() throws InterruptedException {
597	+	final SynchronousQueue q = new SynchronousQueue();
598	+	Thread t1 = newStartedThread(new CheckedRunnable() {
599	+	public void realRun() throws InterruptedException {
600	+	q.put(one);
601	+	}});
602	+
603	+	Thread t2 = newStartedThread(new CheckedRunnable() {
604	+	public void realRun() throws InterruptedException {
605	+	q.put(two);
606	+	}});
607	+
608	+	ArrayList l = new ArrayList();
609	+	int drained;
610	+	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
611	+	assertEquals(1, drained);
612	+	assertEquals(1, l.size());
613	+	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
614	+	assertEquals(1, drained);
615	+	assertEquals(2, l.size());
616	+	assertTrue(l.contains(one));
617	+	assertTrue(l.contains(two));
618	+	awaitTermination(t1);
619	+	awaitTermination(t2);
620	+	}
621	+
622	+	/**
623	+	* remove(null), contains(null) always return false
624	+	*/
625	+	public void testNeverContainsNull() {
626	+	Collection<?> q = new SynchronousQueue();
627	+	assertFalse(q.contains(null));
628	+	assertFalse(q.remove(null));
629	+	}
630	+
631		}

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