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

Comparing jsr166/src/test/tck/SynchronousQueueTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.63 by jsr166, Sun Aug 11 22:29:27 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	>	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	<	public void testEmptyFull() {
50	<	SynchronousQueue q = new SynchronousQueue();
49	>	/**
50	>	* Any SynchronousQueue is both empty and full
51	>	*/
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(new Integer(3)));
59	>	assertFalse(q.offer(zero));
60		}
61
62	<	public void testOfferNull(){
63	<	try {
64	<	SynchronousQueue q = new SynchronousQueue();
65	<	q.offer(null);
66	<	fail("should throw NPE");
67	<	} catch (NullPointerException success) { }
68	<	}
62	>	/**
63	>	* offer fails if no active taker
64	>	*/
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 IllegalStateException if no active taker
74	>	*/
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) {}
84	>	}
85	>
86	>	/**
87	>	* addAll(this) throws IllegalArgumentException
88	>	*/
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	>	q.addAll(q);
95	>	shouldThrow();
96	>	} catch (IllegalArgumentException success) {}
97	>	}
98	>
99	>	/**
100	>	* addAll throws IllegalStateException if no active taker
101	>	*/
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	>	q.addAll(coll);
112	>	shouldThrow();
113	>	} catch (IllegalStateException success) {}
114	>	}
115	>
116	>	/**
117	>	* put blocks interruptibly if no active taker
118	>	*/
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	<	public void testOffer(){
134	<	SynchronousQueue q = new SynchronousQueue();
135	<	assertFalse(q.offer(new Integer(1)));
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	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
143	>	t.interrupt();
144	>	awaitTermination(t);
145	>	assertEquals(0, q.remainingCapacity());
146		}
147
148	<	public void testAdd(){
149	<	try {
150	<	SynchronousQueue q = new SynchronousQueue();
151	<	assertEquals(0, q.remainingCapacity());
152	<	q.add(new Integer(0));
153	<	} catch (IllegalStateException success){
154	<	}
155	<	}
148	>	/**
149	>	* put blocks interruptibly waiting for take
150	>	*/
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	<	public void testAddAll1(){
163	<	try {
164	<	SynchronousQueue q = new SynchronousQueue();
165	<	q.addAll(null);
166	<	fail("Cannot add null collection");
167	<	}
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	<	}
162	>	Thread.currentThread().interrupt();
163	>	try {
164	>	q.put(99);
165	>	shouldThrow();
166	>	} catch (InterruptedException success) {}
167	>	assertFalse(Thread.interrupted());
168
169	<	public void testPutNull() {
170	<	try {
171	<	SynchronousQueue q = new SynchronousQueue();
172	<	q.put(null);
173	<	fail("put should throw NPE");
174	<	}
175	<	catch (NullPointerException success){
89	<	}
90	<	catch (InterruptedException ie) {
91	<	fail("Unexpected exception");
92	<	}
93	<	}
169	>	pleaseInterrupt.countDown();
170	>	try {
171	>	q.put(99);
172	>	shouldThrow();
173	>	} catch (InterruptedException success) {}
174	>	assertFalse(Thread.interrupted());
175	>	}});
176
177	<	public void testBlockingPut(){
178	<	Thread t = new Thread(new Runnable() {
179	<	public void run() {
180	<	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	<	}
177	>	await(pleaseTake);
178	>	assertEquals(0, q.remainingCapacity());
179	>	try { assertSame(one, q.take()); }
180	>	catch (InterruptedException e) { threadUnexpectedException(e); }
181
182	<	public void testPutWithTake() {
183	<	final SynchronousQueue q = new SynchronousQueue();
184	<	Thread t = new Thread(new Runnable() {
185	<	public void run(){
186	<	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	<	}
182	>	await(pleaseInterrupt);
183	>	if (randomBoolean()) 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));
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	<	}
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
200	<	public void testPoll(){
201	<	SynchronousQueue q = new SynchronousQueue();
194	<	assertNull(q.poll());
195	<	}
200	>	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
201	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
202
203	<	public void testTimedPoll0() {
204	<	try {
205	<	SynchronousQueue q = new SynchronousQueue();
206	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
207	<	} catch (InterruptedException e){
208	<	fail("Unexpected exception");
203	<	}
204	<	}
203	>	Thread.currentThread().interrupt();
204	>	try {
205	>	q.offer(new Object(), randomTimeout(), randomTimeUnit());
206	>	shouldThrow();
207	>	} catch (InterruptedException success) {}
208	>	assertFalse(Thread.interrupted());
209
210	+	pleaseInterrupt.countDown();
211	+	try {
212	+	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
213	+	shouldThrow();
214	+	} catch (InterruptedException success) {}
215	+	assertFalse(Thread.interrupted());
216	+
217	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
218	+	}});
219	+
220	+	await(pleaseInterrupt);
221	+	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
222	+	t.interrupt();
223	+	awaitTermination(t);
224	+	}
225	+
226	+	/**
227	+	* poll return null if no active putter
228	+	*/
229	+	public void testPoll()      { testPoll(false); }
230	+	public void testPoll_fair() { testPoll(true); }
231	+	public void testPoll(boolean fair) {
232	+	final SynchronousQueue q = new SynchronousQueue(fair);
233	+	assertNull(q.poll());
234	+	}
235	+
236	+	/**
237	+	* timed poll with zero timeout times out if no active putter
238	+	*/
239	+	public void testTimedPoll0()      { testTimedPoll0(false); }
240	+	public void testTimedPoll0_fair() { testTimedPoll0(true); }
241	+	public void testTimedPoll0(boolean fair) {
242	+	final SynchronousQueue q = new SynchronousQueue(fair);
243	+	try { assertNull(q.poll(0, MILLISECONDS)); }
244	+	catch (InterruptedException e) { threadUnexpectedException(e); }
245	+	}
246	+
247	+	/**
248	+	* timed poll with nonzero timeout times out if no active putter
249	+	*/
250		public void testTimedPoll() {
251	<	try {
252	<	SynchronousQueue q = new SynchronousQueue();
253	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
254	<	} catch (InterruptedException e){
255	<	fail("Unexpected exception");
256	<	}
257	<	}
258	<
259	<	public void testInterruptedTimedPoll(){
260	<	Thread t = new Thread(new Runnable() {
261	<	public void run() {
262	<	try {
263	<	SynchronousQueue q = new SynchronousQueue();
264	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
265	<	} catch (InterruptedException success){
266	<	}
267	<	}});
268	<	t.start();
269	<	try {
270	<	Thread.sleep(SHORT_DELAY_MS);
271	<	t.interrupt();
272	<	t.join();
273	<	}
274	<	catch (InterruptedException ie) {
275	<	fail("Unexpected exception");
276	<	}
233	<	}
251	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
252	>	final SynchronousQueue q = new SynchronousQueue(fair);
253	>	final long startTime = System.nanoTime();
254	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
255	>	catch (InterruptedException e) { threadUnexpectedException(e); }
256	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
257	>	}
258	>
259	>	/**
260	>	* timed poll before a delayed offer times out, returning null;
261	>	* after offer succeeds; on interruption throws
262	>	*/
263	>	public void testTimedPollWithOffer() {
264	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
265	>	final SynchronousQueue q = new SynchronousQueue(fair);
266	>	final CountDownLatch pleaseOffer = new CountDownLatch(1);
267	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
268	>	Thread t = newStartedThread(new CheckedRunnable() {
269	>	public void realRun() throws InterruptedException {
270	>	long startTime = System.nanoTime();
271	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
272	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
273	>
274	>	pleaseOffer.countDown();
275	>	startTime = System.nanoTime();
276	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
277
278	<	public void testTimedPollWithOffer(){
279	<	final SynchronousQueue q = new SynchronousQueue();
280	<	Thread t = new Thread(new Runnable() {
281	<	public void run(){
282	<	try {
283	<	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	<	}
278	>	Thread.currentThread().interrupt();
279	>	try {
280	>	q.poll(randomTimeout(), randomTimeUnit());
281	>	shouldThrow();
282	>	} catch (InterruptedException success) {}
283	>	assertFalse(Thread.interrupted());
284
285	<	public void testElement(){
286	<	SynchronousQueue q = new SynchronousQueue();
285	>	pleaseInterrupt.countDown();
286	>	try {
287	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
288	>	shouldThrow();
289	>	} catch (InterruptedException success) {}
290	>	assertFalse(Thread.interrupted());
291	>
292	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
293	>	}});
294	>
295	>	await(pleaseOffer);
296	>	long startTime = System.nanoTime();
297	>	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
298	>	catch (InterruptedException e) { threadUnexpectedException(e); }
299	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
300	>
301	>	await(pleaseInterrupt);
302	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
303	>	t.interrupt();
304	>	awaitTermination(t);
305	>	}
306	>
307	>	/**
308	>	* peek() returns null if no active putter
309	>	*/
310	>	public void testPeek()      { testPeek(false); }
311	>	public void testPeek_fair() { testPeek(true); }
312	>	public void testPeek(boolean fair) {
313	>	final SynchronousQueue q = new SynchronousQueue(fair);
314	>	assertNull(q.peek());
315	>	}
316	>
317	>	/**
318	>	* element() throws NoSuchElementException if no active putter
319	>	*/
320	>	public void testElement()      { testElement(false); }
321	>	public void testElement_fair() { testElement(true); }
322	>	public void testElement(boolean fair) {
323	>	final SynchronousQueue q = new SynchronousQueue(fair);
324		try {
325		q.element();
326	<	fail("no such element");
327	<	}
270	<	catch (NoSuchElementException success) {}
326	>	shouldThrow();
327	>	} catch (NoSuchElementException success) {}
328		}
329
330	<	public void testRemove(){
331	<	SynchronousQueue q = new SynchronousQueue();
330	>	/**
331	>	* remove() throws NoSuchElementException if no active putter
332	>	*/
333	>	public void testRemove()      { testRemove(false); }
334	>	public void testRemove_fair() { testRemove(true); }
335	>	public void testRemove(boolean fair) {
336	>	final SynchronousQueue q = new SynchronousQueue(fair);
337		try {
338		q.remove();
339	<	fail("remove should throw");
340	<	} 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)));
339	>	shouldThrow();
340	>	} catch (NoSuchElementException success) {}
341		}
342
343	<	public void testClear(){
344	<	SynchronousQueue q = new SynchronousQueue();
343	>	/**
344	>	* contains returns false
345	>	*/
346	>	public void testContains()      { testContains(false); }
347	>	public void testContains_fair() { testContains(true); }
348	>	public void testContains(boolean fair) {
349	>	final SynchronousQueue q = new SynchronousQueue(fair);
350	>	assertFalse(q.contains(zero));
351	>	}
352	>
353	>	/**
354	>	* clear ensures isEmpty
355	>	*/
356	>	public void testClear()      { testClear(false); }
357	>	public void testClear_fair() { testClear(true); }
358	>	public void testClear(boolean fair) {
359	>	final SynchronousQueue q = new SynchronousQueue(fair);
360		q.clear();
361		assertTrue(q.isEmpty());
362		}
363
364	<	public void testContainsAll(){
365	<	SynchronousQueue q = new SynchronousQueue();
364	>	/**
365	>	* containsAll returns false unless empty
366	>	*/
367	>	public void testContainsAll()      { testContainsAll(false); }
368	>	public void testContainsAll_fair() { testContainsAll(true); }
369	>	public void testContainsAll(boolean fair) {
370	>	final SynchronousQueue q = new SynchronousQueue(fair);
371		Integer[] empty = new Integer[0];
372	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
373	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
372	>	assertTrue(q.containsAll(Arrays.asList(empty)));
373	>	Integer[] ints = new Integer[1]; ints[0] = zero;
374		assertFalse(q.containsAll(Arrays.asList(ints)));
375		}
376
377	<	public void testRetainAll(){
378	<	SynchronousQueue q = new SynchronousQueue();
377	>	/**
378	>	* retainAll returns false
379	>	*/
380	>	public void testRetainAll()      { testRetainAll(false); }
381	>	public void testRetainAll_fair() { testRetainAll(true); }
382	>	public void testRetainAll(boolean fair) {
383	>	final SynchronousQueue q = new SynchronousQueue(fair);
384		Integer[] empty = new Integer[0];
385	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
386	<	q.retainAll(Arrays.asList(ints));
387	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
313	<	assertFalse(q.containsAll(Arrays.asList(ints)));
385	>	assertFalse(q.retainAll(Arrays.asList(empty)));
386	>	Integer[] ints = new Integer[1]; ints[0] = zero;
387	>	assertFalse(q.retainAll(Arrays.asList(ints)));
388		}
389
390	<	public void testRemoveAll(){
391	<	SynchronousQueue q = new SynchronousQueue();
390	>	/**
391	>	* removeAll returns false
392	>	*/
393	>	public void testRemoveAll()      { testRemoveAll(false); }
394	>	public void testRemoveAll_fair() { testRemoveAll(true); }
395	>	public void testRemoveAll(boolean fair) {
396	>	final SynchronousQueue q = new SynchronousQueue(fair);
397		Integer[] empty = new Integer[0];
398	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
399	<	q.removeAll(Arrays.asList(ints));
321	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
398	>	assertFalse(q.removeAll(Arrays.asList(empty)));
399	>	Integer[] ints = new Integer[1]; ints[0] = zero;
400		assertFalse(q.containsAll(Arrays.asList(ints)));
401		}
402
403	<
404	<	public void testToArray(){
405	<	SynchronousQueue q = new SynchronousQueue();
406	<	Object[] o = q.toArray();
407	<	assertEquals(o.length, 0);
408	<	}
409	<
410	<	public void testToArray2(){
411	<	SynchronousQueue q = new SynchronousQueue();
412	<	Integer[] ints = new Integer[1];
413	<	assertNull(ints[0]);
414	<	}
415	<
416	<	public void testIterator(){
417	<	SynchronousQueue q = new SynchronousQueue();
418	<	Iterator it = q.iterator();
419	<	assertFalse(it.hasNext());
420	<	try {
421	<	Object x = it.next();
422	<	fail("should throw");
423	<	}
424	<	catch (NoSuchElementException success) {}
425	<	}
426	<
427	<	public void testIteratorRemove(){
428	<	SynchronousQueue q = new SynchronousQueue();
429	<	Iterator it = q.iterator();
403	>	/**
404	>	* toArray is empty
405	>	*/
406	>	public void testToArray()      { testToArray(false); }
407	>	public void testToArray_fair() { testToArray(true); }
408	>	public void testToArray(boolean fair) {
409	>	final SynchronousQueue q = new SynchronousQueue(fair);
410	>	Object[] o = q.toArray();
411	>	assertEquals(0, o.length);
412	>	}
413	>
414	>	/**
415	>	* toArray(Integer array) returns its argument with the first
416	>	* element (if present) nulled out
417	>	*/
418	>	public void testToArray2()      { testToArray2(false); }
419	>	public void testToArray2_fair() { testToArray2(true); }
420	>	public void testToArray2(boolean fair) {
421	>	final SynchronousQueue<Integer> q = new SynchronousQueue<>(fair);
422	>	Integer[] a;
423	>
424	>	a = new Integer[0];
425	>	assertSame(a, q.toArray(a));
426	>
427	>	a = new Integer[3];
428	>	Arrays.fill(a, 42);
429	>	assertSame(a, q.toArray(a));
430	>	assertNull(a[0]);
431	>	for (int i = 1; i < a.length; i++)
432	>	assertEquals(42, (int) a[i]);
433	>	}
434	>
435	>	/**
436	>	* toArray(null) throws NPE
437	>	*/
438	>	public void testToArray_null()      { testToArray_null(false); }
439	>	public void testToArray_null_fair() { testToArray_null(true); }
440	>	public void testToArray_null(boolean fair) {
441	>	final SynchronousQueue q = new SynchronousQueue(fair);
442	>	try {
443	>	Object[] o = q.toArray((Object[])null);
444	>	shouldThrow();
445	>	} catch (NullPointerException success) {}
446	>	}
447	>
448	>	/**
449	>	* iterator does not traverse any elements
450	>	*/
451	>	public void testIterator()      { testIterator(false); }
452	>	public void testIterator_fair() { testIterator(true); }
453	>	public void testIterator(boolean fair) {
454	>	assertIteratorExhausted(new SynchronousQueue(fair).iterator());
455	>	}
456	>
457	>	/**
458	>	* iterator remove throws IllegalStateException
459	>	*/
460	>	public void testIteratorRemove()      { testIteratorRemove(false); }
461	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
462	>	public void testIteratorRemove(boolean fair) {
463	>	final SynchronousQueue q = new SynchronousQueue(fair);
464	>	Iterator it = q.iterator();
465		try {
466		it.remove();
467	<	fail("should throw");
468	<	}
356	<	catch (IllegalStateException success) {}
467	>	shouldThrow();
468	>	} catch (IllegalStateException success) {}
469		}
470
471	<	public void testToString(){
472	<	SynchronousQueue q = new SynchronousQueue();
471	>	/**
472	>	* toString returns a non-null string
473	>	*/
474	>	public void testToString()      { testToString(false); }
475	>	public void testToString_fair() { testToString(true); }
476	>	public void testToString(boolean fair) {
477	>	final SynchronousQueue q = new SynchronousQueue(fair);
478		String s = q.toString();
479	<	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	<
479	>	assertNotNull(s);
480		}
481
482	<	public void testPollInExecutor() {
483	<
484	<	final SynchronousQueue q = new SynchronousQueue();
485	<
486	<	ExecutorService executor = Executors.newFixedThreadPool(2);
482	>	/**
483	>	* offer transfers elements across Executor tasks
484	>	*/
485	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
486	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
487	>	public void testOfferInExecutor(boolean fair) {
488	>	final SynchronousQueue q = new SynchronousQueue(fair);
489	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
490	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
491	>	try (PoolCleaner cleaner = cleaner(executor)) {
492	>
493	>	executor.execute(new CheckedRunnable() {
494	>	public void realRun() throws InterruptedException {
495	>	assertFalse(q.offer(one));
496	>	threadsStarted.await();
497	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
498	>	assertEquals(0, q.remainingCapacity());
499	>	}});
500
501	<	executor.execute(new Runnable() {
502	<	public void run() {
503	<	threadAssertNull(q.poll());
504	<	try {
505	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
506	<	threadAssertTrue(q.isEmpty());
507	<	}
413	<	catch (InterruptedException e) {
414	<	threadFail("should not be interrupted");
415	<	}
416	<	}
417	<	});
501	>	executor.execute(new CheckedRunnable() {
502	>	public void realRun() throws InterruptedException {
503	>	threadsStarted.await();
504	>	assertSame(one, q.take());
505	>	}});
506	>	}
507	>	}
508
509	<	executor.execute(new Runnable() {
510	<	public void run() {
511	<	try {
512	<	Thread.sleep(SMALL_DELAY_MS);
513	<	q.put(new Integer(1));
514	<	}
515	<	catch (InterruptedException e) {
516	<	threadFail("should not be interrupted");
517	<	}
518	<	}
519	<	});
520	<
521	<	joinPool(executor);
509	>	/**
510	>	* timed poll retrieves elements across Executor threads
511	>	*/
512	>	public void testPollInExecutor()      { testPollInExecutor(false); }
513	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
514	>	public void testPollInExecutor(boolean fair) {
515	>	final SynchronousQueue q = new SynchronousQueue(fair);
516	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
517	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
518	>	try (PoolCleaner cleaner = cleaner(executor)) {
519	>	executor.execute(new CheckedRunnable() {
520	>	public void realRun() throws InterruptedException {
521	>	assertNull(q.poll());
522	>	threadsStarted.await();
523	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
524	>	assertTrue(q.isEmpty());
525	>	}});
526
527	+	executor.execute(new CheckedRunnable() {
528	+	public void realRun() throws InterruptedException {
529	+	threadsStarted.await();
530	+	q.put(one);
531	+	}});
532	+	}
533		}
534
535	+	/**
536	+	* a deserialized/reserialized queue is usable
537	+	*/
538		public void testSerialization() {
539	<	SynchronousQueue q = new SynchronousQueue();
540	<	try {
541	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
542	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
543	<	out.writeObject(q);
544	<	out.close();
545	<
546	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
547	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
548	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
549	<	assertEquals(q.size(), r.size());
550	<	while (!q.isEmpty())
551	<	assertEquals(q.remove(), r.remove());
552	<	} catch(Exception e){
450	<	fail("unexpected exception");
539	>	final SynchronousQueue x = new SynchronousQueue();
540	>	final SynchronousQueue y = new SynchronousQueue(false);
541	>	final SynchronousQueue z = new SynchronousQueue(true);
542	>	assertSerialEquals(x, y);
543	>	assertNotSerialEquals(x, z);
544	>	SynchronousQueue[] qs = { x, y, z };
545	>	for (SynchronousQueue q : qs) {
546	>	SynchronousQueue clone = serialClone(q);
547	>	assertNotSame(q, clone);
548	>	assertSerialEquals(q, clone);
549	>	assertTrue(clone.isEmpty());
550	>	assertEquals(0, clone.size());
551	>	assertEquals(0, clone.remainingCapacity());
552	>	assertFalse(clone.offer(zero));
553		}
554		}
555
556	+	/**
557	+	* drainTo(c) of empty queue doesn't transfer elements
558	+	*/
559	+	public void testDrainTo()      { testDrainTo(false); }
560	+	public void testDrainTo_fair() { testDrainTo(true); }
561	+	public void testDrainTo(boolean fair) {
562	+	final SynchronousQueue q = new SynchronousQueue(fair);
563	+	ArrayList l = new ArrayList();
564	+	q.drainTo(l);
565	+	assertEquals(0, q.size());
566	+	assertEquals(0, l.size());
567	+	}
568	+
569	+	/**
570	+	* drainTo empties queue, unblocking a waiting put.
571	+	*/
572	+	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
573	+	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
574	+	public void testDrainToWithActivePut(boolean fair) {
575	+	final SynchronousQueue q = new SynchronousQueue(fair);
576	+	Thread t = newStartedThread(new CheckedRunnable() {
577	+	public void realRun() throws InterruptedException {
578	+	q.put(one);
579	+	}});
580	+
581	+	ArrayList l = new ArrayList();
582	+	long startTime = System.nanoTime();
583	+	while (l.isEmpty()) {
584	+	q.drainTo(l);
585	+	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
586	+	fail("timed out");
587	+	Thread.yield();
588	+	}
589	+	assertEquals(1, l.size());
590	+	assertSame(one, l.get(0));
591	+	awaitTermination(t);
592	+	}
593	+
594	+	/**
595	+	* drainTo(c, n) empties up to n elements of queue into c
596	+	*/
597	+	public void testDrainToN() throws InterruptedException {
598	+	final SynchronousQueue q = new SynchronousQueue();
599	+	Thread t1 = newStartedThread(new CheckedRunnable() {
600	+	public void realRun() throws InterruptedException {
601	+	q.put(one);
602	+	}});
603	+
604	+	Thread t2 = newStartedThread(new CheckedRunnable() {
605	+	public void realRun() throws InterruptedException {
606	+	q.put(two);
607	+	}});
608	+
609	+	ArrayList l = new ArrayList();
610	+	int drained;
611	+	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
612	+	assertEquals(1, drained);
613	+	assertEquals(1, l.size());
614	+	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
615	+	assertEquals(1, drained);
616	+	assertEquals(2, l.size());
617	+	assertTrue(l.contains(one));
618	+	assertTrue(l.contains(two));
619	+	awaitTermination(t1);
620	+	awaitTermination(t2);
621	+	}
622	+
623	+	/**
624	+	* remove(null), contains(null) always return false
625	+	*/
626	+	public void testNeverContainsNull() {
627	+	Collection<?> q = new SynchronousQueue();
628	+	assertFalse(q.contains(null));
629	+	assertFalse(q.remove(null));
630	+	}
631	+
632		}

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