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

Comparing jsr166/src/test/tck/SynchronousQueueTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 18:20:08 2003 UTC vs.
Revision 1.34 by jsr166, Sat May 21 06:24:33 2011 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 static java.util.concurrent.TimeUnit.MILLISECONDS;
13		import java.io.*;
14
15		public class SynchronousQueueTest extends JSR166TestCase {
16
17	+	public static class Fair extends BlockingQueueTest {
18	+	protected BlockingQueue emptyCollection() {
19	+	return new SynchronousQueue(true);
20	+	}
21	+	}
22	+
23	+	public static class NonFair extends BlockingQueueTest {
24	+	protected BlockingQueue emptyCollection() {
25	+	return new SynchronousQueue(false);
26	+	}
27	+	}
28	+
29		public static void main(String[] args) {
30	<	junit.textui.TestRunner.run (suite());
30	>	junit.textui.TestRunner.run(suite());
31		}
32
33		public static Test suite() {
34	<	return new TestSuite(SynchronousQueueTest.class);
34	>	return newTestSuite(SynchronousQueueTest.class,
35	>	new Fair().testSuite(),
36	>	new NonFair().testSuite());
37		}
38
39		/**
40	<	*
40	>	* Any SynchronousQueue is both empty and full
41		*/
42	<	public void testEmptyFull() {
27	<	SynchronousQueue q = new SynchronousQueue();
42	>	public void testEmptyFull(SynchronousQueue q) {
43		assertTrue(q.isEmpty());
44	<	assertEquals(0, q.size());
44	>	assertEquals(0, q.size());
45		assertEquals(0, q.remainingCapacity());
46	<	assertFalse(q.offer(new Integer(3)));
46	>	assertFalse(q.offer(zero));
47	>	}
48	>
49	>	/**
50	>	* A non-fair SynchronousQueue is both empty and full
51	>	*/
52	>	public void testEmptyFull() {
53	>	testEmptyFull(new SynchronousQueue());
54	>	}
55	>
56	>	/**
57	>	* A fair SynchronousQueue is both empty and full
58	>	*/
59	>	public void testFairEmptyFull() {
60	>	testEmptyFull(new SynchronousQueue(true));
61		}
62
63		/**
64	<	*
64	>	* offer(null) throws NPE
65		*/
66		public void testOfferNull() {
67	<	try {
67	>	try {
68		SynchronousQueue q = new SynchronousQueue();
69		q.offer(null);
70		shouldThrow();
71	<	} catch (NullPointerException success) { }
71	>	} catch (NullPointerException success) {}
72	>	}
73	>
74	>	/**
75	>	* add(null) throws NPE
76	>	*/
77	>	public void testAddNull() {
78	>	try {
79	>	SynchronousQueue q = new SynchronousQueue();
80	>	q.add(null);
81	>	shouldThrow();
82	>	} catch (NullPointerException success) {}
83		}
84
85		/**
86	<	*
86	>	* offer fails if no active taker
87		*/
88		public void testOffer() {
89		SynchronousQueue q = new SynchronousQueue();
90	<	assertFalse(q.offer(new Integer(1)));
90	>	assertFalse(q.offer(one));
91		}
92
93		/**
94	<	*
94	>	* add throws ISE if no active taker
95		*/
96		public void testAdd() {
97	<	try {
97	>	try {
98		SynchronousQueue q = new SynchronousQueue();
99		assertEquals(0, q.remainingCapacity());
100	<	q.add(new Integer(0));
101	<	} catch (IllegalStateException success){
102	<	}
100	>	q.add(one);
101	>	shouldThrow();
102	>	} catch (IllegalStateException success) {}
103		}
104
105		/**
106	<	*
106	>	* addAll(null) throws NPE
107		*/
108		public void testAddAll1() {
109		try {
110		SynchronousQueue q = new SynchronousQueue();
111		q.addAll(null);
112		shouldThrow();
113	<	}
114	<	catch (NullPointerException success) {}
113	>	} catch (NullPointerException success) {}
114	>	}
115	>
116	>	/**
117	>	* addAll(this) throws IAE
118	>	*/
119	>	public void testAddAllSelf() {
120	>	try {
121	>	SynchronousQueue q = new SynchronousQueue();
122	>	q.addAll(q);
123	>	shouldThrow();
124	>	} catch (IllegalArgumentException success) {}
125		}
126	+
127		/**
128	<	*
128	>	* addAll of a collection with null elements throws NPE
129		*/
130		public void testAddAll2() {
131		try {
#	Line 82 | Line 133 | public class SynchronousQueueTest extend
133		Integer[] ints = new Integer[1];
134		q.addAll(Arrays.asList(ints));
135		shouldThrow();
136	<	}
86	<	catch (NullPointerException success) {}
136	>	} catch (NullPointerException success) {}
137		}
138	+
139		/**
140	<	*
140	>	* addAll throws ISE if no active taker
141		*/
142		public void testAddAll4() {
143		try {
#	Line 96 | Line 147 | public class SynchronousQueueTest extend
147		ints[i] = new Integer(i);
148		q.addAll(Arrays.asList(ints));
149		shouldThrow();
150	<	}
100	<	catch (IllegalStateException success) {}
150	>	} catch (IllegalStateException success) {}
151		}
152
153		/**
154	<	*
154	>	* put(null) throws NPE
155		*/
156	<	public void testPutNull() {
157	<	try {
156	>	public void testPutNull() throws InterruptedException {
157	>	try {
158		SynchronousQueue q = new SynchronousQueue();
159		q.put(null);
160		shouldThrow();
161	<	}
162	<	catch (NullPointerException success){
113	<	}
114	<	catch (InterruptedException ie) {
115	<	unexpectedException();
116	<	}
117	<	}
161	>	} catch (NullPointerException success) {}
162	>	}
163
164		/**
165	<	*
165	>	* put blocks interruptibly if no active taker
166		*/
167	<	public void testBlockingPut() {
168	<	Thread t = new Thread(new Runnable() {
169	<	public void run() {
170	<	try {
171	<	SynchronousQueue q = new SynchronousQueue();
172	<	q.put(new Integer(0));
173	<	threadShouldThrow();
129	<	} catch (InterruptedException ie){
130	<	}
131	<	}});
167	>	public void testBlockingPut() throws InterruptedException {
168	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
169	>	public void realRun() throws InterruptedException {
170	>	SynchronousQueue q = new SynchronousQueue();
171	>	q.put(zero);
172	>	}});
173	>
174		t.start();
175	<	try {
176	<	Thread.sleep(SHORT_DELAY_MS);
177	<	t.interrupt();
136	<	t.join();
137	<	}
138	<	catch (InterruptedException ie) {
139	<	unexpectedException();
140	<	}
175	>	delay(SHORT_DELAY_MS);
176	>	t.interrupt();
177	>	t.join();
178		}
179
180		/**
181	<	*
181	>	* put blocks waiting for take
182		*/
183	<	public void testPutWithTake() {
183	>	public void testPutWithTake() throws InterruptedException {
184		final SynchronousQueue q = new SynchronousQueue();
185	<	Thread t = new Thread(new Runnable() {
186	<	public void run() {
187	<	int added = 0;
188	<	try {
189	<	q.put(new Object());
190	<	++added;
154	<	q.put(new Object());
155	<	++added;
156	<	q.put(new Object());
157	<	++added;
158	<	q.put(new Object());
185	>	Thread t = new Thread(new CheckedRunnable() {
186	>	public void realRun() throws InterruptedException {
187	>	int added = 0;
188	>	try {
189	>	while (true) {
190	>	q.put(added);
191		++added;
160	–	threadShouldThrow();
161	–	} catch (InterruptedException e){
162	–	assertTrue(added >= 1);
192		}
193	+	} catch (InterruptedException success) {
194	+	assertEquals(1, added);
195		}
196	<	});
197	<	try {
198	<	t.start();
199	<	Thread.sleep(SHORT_DELAY_MS);
200	<	q.take();
201	<	Thread.sleep(SHORT_DELAY_MS);
202	<	t.interrupt();
203	<	t.join();
204	<	} catch (Exception e){
205	<	unexpectedException();
206	<	}
196	>	}});
197	>
198	>	t.start();
199	>	delay(SHORT_DELAY_MS);
200	>	assertEquals(0, q.take());
201	>	delay(SHORT_DELAY_MS);
202	>	t.interrupt();
203	>	t.join();
204	>	}
205	>
206	>	/**
207	>	* timed offer times out if elements not taken
208	>	*/
209	>	public void testTimedOffer(final SynchronousQueue q)
210	>	throws InterruptedException {
211	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
212	>	Thread t = newStartedThread(new CheckedRunnable() {
213	>	public void realRun() throws InterruptedException {
214	>	long startTime = System.nanoTime();
215	>	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
216	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
217	>	pleaseInterrupt.countDown();
218	>	try {
219	>	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
220	>	shouldThrow();
221	>	} catch (InterruptedException success) {}
222	>	}});
223	>
224	>	await(pleaseInterrupt);
225	>	t.interrupt();
226	>	awaitTermination(t);
227		}
228
229		/**
230	<	*
230	>	* timed offer times out if elements not taken
231		*/
232	<	public void testTimedOffer() {
233	<	final SynchronousQueue q = new SynchronousQueue();
183	<	Thread t = new Thread(new Runnable() {
184	<	public void run() {
185	<	try {
186	<
187	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
188	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
189	<	threadShouldThrow();
190	<	} catch (InterruptedException success){}
191	<	}
192	<	});
193	<
194	<	try {
195	<	t.start();
196	<	Thread.sleep(SMALL_DELAY_MS);
197	<	t.interrupt();
198	<	t.join();
199	<	} catch (Exception e){
200	<	unexpectedException();
201	<	}
232	>	public void testTimedOffer() throws InterruptedException {
233	>	testTimedOffer(new SynchronousQueue());
234		}
235
236	+	/**
237	+	* timed offer times out if elements not taken
238	+	*/
239	+	public void testFairTimedOffer() throws InterruptedException {
240	+	testTimedOffer(new SynchronousQueue(true));
241	+	}
242
243		/**
244	<	*
244	>	* put blocks interruptibly if no active taker
245		*/
246	<	public void testTakeFromEmpty() {
247	<	final SynchronousQueue q = new SynchronousQueue();
248	<	Thread t = new Thread(new Runnable() {
249	<	public void run() {
250	<	try {
251	<	q.take();
252	<	threadShouldThrow();
253	<	} catch (InterruptedException success){ }
246	>	public void testFairBlockingPut() throws InterruptedException {
247	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
248	>	public void realRun() throws InterruptedException {
249	>	SynchronousQueue q = new SynchronousQueue(true);
250	>	q.put(zero);
251	>	}});
252	>
253	>	t.start();
254	>	delay(SHORT_DELAY_MS);
255	>	t.interrupt();
256	>	t.join();
257	>	}
258	>
259	>	/**
260	>	* put blocks waiting for take
261	>	*/
262	>	public void testFairPutWithTake() throws InterruptedException {
263	>	final SynchronousQueue q = new SynchronousQueue(true);
264	>	Thread t = new Thread(new CheckedRunnable() {
265	>	public void realRun() throws InterruptedException {
266	>	int added = 0;
267	>	try {
268	>	while (true) {
269	>	q.put(added);
270	>	++added;
271	>	}
272	>	} catch (InterruptedException success) {
273	>	assertEquals(1, added);
274		}
275	<	});
276	<	try {
277	<	t.start();
278	<	Thread.sleep(SHORT_DELAY_MS);
279	<	t.interrupt();
280	<	t.join();
281	<	} catch (Exception e){
282	<	unexpectedException();
283	<	}
275	>	}});
276	>
277	>	t.start();
278	>	delay(SHORT_DELAY_MS);
279	>	assertEquals(0, q.take());
280	>	delay(SHORT_DELAY_MS);
281	>	t.interrupt();
282	>	t.join();
283	>	}
284	>
285	>	/**
286	>	* take blocks interruptibly when empty
287	>	*/
288	>	public void testFairTakeFromEmpty() throws InterruptedException {
289	>	final SynchronousQueue q = new SynchronousQueue(true);
290	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
291	>	public void realRun() throws InterruptedException {
292	>	q.take();
293	>	}});
294	>
295	>	t.start();
296	>	delay(SHORT_DELAY_MS);
297	>	t.interrupt();
298	>	t.join();
299		}
300
301		/**
302	<	*
302	>	* poll return null if no active putter
303		*/
304		public void testPoll() {
305		SynchronousQueue q = new SynchronousQueue();
306	<	assertNull(q.poll());
306	>	assertNull(q.poll());
307		}
308
309		/**
310	<	*
310	>	* timed poll with zero timeout times out if no active putter
311		*/
312	<	public void testTimedPoll0() {
313	<	try {
314	<	SynchronousQueue q = new SynchronousQueue();
242	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
243	<	} catch (InterruptedException e){
244	<	unexpectedException();
245	<	}
312	>	public void testTimedPoll0() throws InterruptedException {
313	>	SynchronousQueue q = new SynchronousQueue();
314	>	assertNull(q.poll(0, MILLISECONDS));
315		}
316
317		/**
318	<	*
318	>	* timed poll with nonzero timeout times out if no active putter
319		*/
320	<	public void testTimedPoll() {
321	<	try {
322	<	SynchronousQueue q = new SynchronousQueue();
323	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
324	<	} catch (InterruptedException e){
256	<	unexpectedException();
257	<	}
320	>	public void testTimedPoll() throws InterruptedException {
321	>	SynchronousQueue q = new SynchronousQueue();
322	>	long t0 = System.nanoTime();
323	>	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
324	>	assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS);
325		}
326
327		/**
328	<	*
329	<	*/
330	<	public void testInterruptedTimedPoll() {
331	<	Thread t = new Thread(new Runnable() {
332	<	public void run() {
333	<	try {
334	<	SynchronousQueue q = new SynchronousQueue();
335	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
336	<	} catch (InterruptedException success){
337	<	}
338	<	}});
339	<	t.start();
340	<	try {
341	<	Thread.sleep(SHORT_DELAY_MS);
342	<	t.interrupt();
343	<	t.join();
344	<	}
345	<	catch (InterruptedException ie) {
346	<	unexpectedException();
347	<	}
328	>	* Interrupted timed poll throws InterruptedException instead of
329	>	* returning timeout status
330	>	*/
331	>	public void testInterruptedTimedPoll(final SynchronousQueue q)
332	>	throws InterruptedException {
333	>	final CountDownLatch threadStarted = new CountDownLatch(1);
334	>	Thread t = newStartedThread(new CheckedRunnable() {
335	>	public void realRun() throws InterruptedException {
336	>	long t0 = System.nanoTime();
337	>	threadStarted.countDown();
338	>	try {
339	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
340	>	shouldThrow();
341	>	} catch (InterruptedException success) {}
342	>	assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS);
343	>	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
344	>	}});
345	>
346	>	threadStarted.await();
347	>	delay(SHORT_DELAY_MS);
348	>	t.interrupt();
349	>	awaitTermination(t, MEDIUM_DELAY_MS);
350		}
351
352		/**
353	<	*
353	>	* Interrupted timed poll throws InterruptedException instead of
354	>	* returning timeout status
355		*/
356	<	public void testTimedPollWithOffer() {
357	<	final SynchronousQueue q = new SynchronousQueue();
358	<	Thread t = new Thread(new Runnable() {
359	<	public void run() {
360	<	try {
361	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
362	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
363	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
364	<	threadShouldThrow();
365	<	} catch (InterruptedException success) { }
366	<	}
367	<	});
368	<	try {
369	<	t.start();
370	<	Thread.sleep(SMALL_DELAY_MS);
371	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
372	<	t.interrupt();
373	<	t.join();
374	<	} catch (Exception e){
375	<	unexpectedException();
376	<	}
377	<	}
356	>	public void testInterruptedTimedPoll() throws InterruptedException {
357	>	testInterruptedTimedPoll(new SynchronousQueue());
358	>	}
359	>
360	>	/**
361	>	* Interrupted timed poll throws InterruptedException instead of
362	>	* returning timeout status
363	>	*/
364	>	public void testFairInterruptedTimedPoll() throws InterruptedException {
365	>	testInterruptedTimedPoll(new SynchronousQueue(true));
366	>	}
367	>
368	>	/**
369	>	* timed poll before a delayed offer times out, returning null;
370	>	* after offer succeeds; on interruption throws
371	>	*/
372	>	public void testFairTimedPollWithOffer() throws InterruptedException {
373	>	final SynchronousQueue q = new SynchronousQueue(true);
374	>	final CountDownLatch pleaseOffer = new CountDownLatch(1);
375	>	Thread t = newStartedThread(new CheckedRunnable() {
376	>	public void realRun() throws InterruptedException {
377	>	long t0 = System.nanoTime();
378	>	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
379	>	assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS);
380	>
381	>	pleaseOffer.countDown();
382	>	t0 = System.nanoTime();
383	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
384	>	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
385	>
386	>	t0 = System.nanoTime();
387	>	try {
388	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
389	>	shouldThrow();
390	>	} catch (InterruptedException success) {}
391	>	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
392	>	}});
393	>
394	>	assertTrue(pleaseOffer.await(MEDIUM_DELAY_MS, MILLISECONDS));
395	>	long t0 = System.nanoTime();
396	>	assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS));
397	>	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
398
399	+	t.interrupt();
400	+	awaitTermination(t, MEDIUM_DELAY_MS);
401	+	}
402
403		/**
404	<	*
404	>	* peek() returns null if no active putter
405		*/
406		public void testPeek() {
407		SynchronousQueue q = new SynchronousQueue();
408	<	assertNull(q.peek());
408	>	assertNull(q.peek());
409		}
410
411		/**
412	<	*
412	>	* element() throws NSEE if no active putter
413		*/
414		public void testElement() {
415		SynchronousQueue q = new SynchronousQueue();
416		try {
417		q.element();
418		shouldThrow();
419	<	}
327	<	catch (NoSuchElementException success) {}
419	>	} catch (NoSuchElementException success) {}
420		}
421
422		/**
423	<	*
423	>	* remove() throws NSEE if no active putter
424		*/
425		public void testRemove() {
426		SynchronousQueue q = new SynchronousQueue();
427		try {
428		q.remove();
429		shouldThrow();
430	<	} catch (NoSuchElementException success){
339	<	}
430	>	} catch (NoSuchElementException success) {}
431		}
432
433		/**
434	<	*
434	>	* remove(x) returns false
435		*/
436		public void testRemoveElement() {
437		SynchronousQueue q = new SynchronousQueue();
438	<	assertFalse(q.remove(new Integer(0)));
438	>	assertFalse(q.remove(zero));
439		assertTrue(q.isEmpty());
440		}
441	<
441	>
442		/**
443	<	*
443	>	* contains returns false
444		*/
445		public void testContains() {
446		SynchronousQueue q = new SynchronousQueue();
447	<	assertFalse(q.contains(new Integer(0)));
447	>	assertFalse(q.contains(zero));
448		}
449
450		/**
451	<	*
451	>	* clear ensures isEmpty
452		*/
453		public void testClear() {
454		SynchronousQueue q = new SynchronousQueue();
#	Line 366 | Line 457 | public class SynchronousQueueTest extend
457		}
458
459		/**
460	<	*
460	>	* containsAll returns false unless empty
461		*/
462		public void testContainsAll() {
463		SynchronousQueue q = new SynchronousQueue();
464		Integer[] empty = new Integer[0];
465	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
465	>	assertTrue(q.containsAll(Arrays.asList(empty)));
466	>	Integer[] ints = new Integer[1]; ints[0] = zero;
467		assertFalse(q.containsAll(Arrays.asList(ints)));
468		}
469
470		/**
471	<	*
471	>	* retainAll returns false
472		*/
473		public void testRetainAll() {
474		SynchronousQueue q = new SynchronousQueue();
475		Integer[] empty = new Integer[0];
476	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
477	<	q.retainAll(Arrays.asList(ints));
478	<	assertFalse(q.containsAll(Arrays.asList(ints)));
476	>	assertFalse(q.retainAll(Arrays.asList(empty)));
477	>	Integer[] ints = new Integer[1]; ints[0] = zero;
478	>	assertFalse(q.retainAll(Arrays.asList(ints)));
479		}
480
481		/**
482	<	*
482	>	* removeAll returns false
483		*/
484		public void testRemoveAll() {
485		SynchronousQueue q = new SynchronousQueue();
486		Integer[] empty = new Integer[0];
487	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
488	<	q.removeAll(Arrays.asList(ints));
487	>	assertFalse(q.removeAll(Arrays.asList(empty)));
488	>	Integer[] ints = new Integer[1]; ints[0] = zero;
489		assertFalse(q.containsAll(Arrays.asList(ints)));
490		}
491
492
493		/**
494	<	*
494	>	* toArray is empty
495		*/
496		public void testToArray() {
497		SynchronousQueue q = new SynchronousQueue();
498	<	Object[] o = q.toArray();
498	>	Object[] o = q.toArray();
499		assertEquals(o.length, 0);
500		}
501
502		/**
503	<	*
503	>	* toArray(a) is nulled at position 0
504		*/
505		public void testToArray2() {
506		SynchronousQueue q = new SynchronousQueue();
507	<	Integer[] ints = new Integer[1];
507	>	Integer[] ints = new Integer[1];
508		assertNull(ints[0]);
509		}
510	<
510	>
511		/**
512	<	*
512	>	* toArray(null) throws NPE
513	>	*/
514	>	public void testToArray_BadArg() {
515	>	SynchronousQueue q = new SynchronousQueue();
516	>	try {
517	>	Object o[] = q.toArray(null);
518	>	shouldThrow();
519	>	} catch (NullPointerException success) {}
520	>	}
521	>
522	>
523	>	/**
524	>	* iterator does not traverse any elements
525		*/
526		public void testIterator() {
527		SynchronousQueue q = new SynchronousQueue();
528	<	Iterator it = q.iterator();
528	>	Iterator it = q.iterator();
529		assertFalse(it.hasNext());
530		try {
531		Object x = it.next();
532		shouldThrow();
533	<	}
430	<	catch (NoSuchElementException success) {}
533	>	} catch (NoSuchElementException success) {}
534		}
535
536		/**
537	<	*
537	>	* iterator remove throws ISE
538		*/
539		public void testIteratorRemove() {
540		SynchronousQueue q = new SynchronousQueue();
541	<	Iterator it = q.iterator();
541	>	Iterator it = q.iterator();
542		try {
543		it.remove();
544		shouldThrow();
545	<	}
443	<	catch (IllegalStateException success) {}
545	>	} catch (IllegalStateException success) {}
546		}
547
548		/**
549	<	*
549	>	* toString returns a non-null string
550		*/
551		public void testToString() {
552		SynchronousQueue q = new SynchronousQueue();
553		String s = q.toString();
554	<	assertTrue(s != null);
555	<	}
554	>	assertNotNull(s);
555	>	}
556
557
558		/**
559	<	*
559	>	* offer transfers elements across Executor tasks
560		*/
561		public void testOfferInExecutor() {
562		final SynchronousQueue q = new SynchronousQueue();
563		ExecutorService executor = Executors.newFixedThreadPool(2);
462	–	final Integer one = new Integer(1);
564
565	<	executor.execute(new Runnable() {
566	<	public void run() {
567	<	threadAssertFalse(q.offer(one));
568	<	try {
569	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
570	<	threadAssertEquals(0, q.remainingCapacity());
571	<	}
572	<	catch (InterruptedException e) {
573	<	threadUnexpectedException();
574	<	}
575	<	}
576	<	});
565	>	executor.execute(new CheckedRunnable() {
566	>	public void realRun() throws InterruptedException {
567	>	assertFalse(q.offer(one));
568	>	assertTrue(q.offer(one, MEDIUM_DELAY_MS, MILLISECONDS));
569	>	assertEquals(0, q.remainingCapacity());
570	>	}});
571	>
572	>	executor.execute(new CheckedRunnable() {
573	>	public void realRun() throws InterruptedException {
574	>	delay(SMALL_DELAY_MS);
575	>	assertSame(one, q.take());
576	>	}});
577
477	–	executor.execute(new Runnable() {
478	–	public void run() {
479	–	try {
480	–	Thread.sleep(SMALL_DELAY_MS);
481	–	threadAssertEquals(one, q.take());
482	–	}
483	–	catch (InterruptedException e) {
484	–	threadUnexpectedException();
485	–	}
486	–	}
487	–	});
488	–
578		joinPool(executor);
490	–
579		}
580
581		/**
582	<	*
582	>	* poll retrieves elements across Executor threads
583		*/
584		public void testPollInExecutor() {
497	–
585		final SynchronousQueue q = new SynchronousQueue();
499	–
586		ExecutorService executor = Executors.newFixedThreadPool(2);
587	+	executor.execute(new CheckedRunnable() {
588	+	public void realRun() throws InterruptedException {
589	+	assertNull(q.poll());
590	+	assertSame(one, q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
591	+	assertTrue(q.isEmpty());
592	+	}});
593	+
594	+	executor.execute(new CheckedRunnable() {
595	+	public void realRun() throws InterruptedException {
596	+	delay(SHORT_DELAY_MS);
597	+	q.put(one);
598	+	}});
599
502	–	executor.execute(new Runnable() {
503	–	public void run() {
504	–	threadAssertNull(q.poll());
505	–	try {
506	–	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
507	–	threadAssertTrue(q.isEmpty());
508	–	}
509	–	catch (InterruptedException e) {
510	–	threadUnexpectedException();
511	–	}
512	–	}
513	–	});
514	–
515	–	executor.execute(new Runnable() {
516	–	public void run() {
517	–	try {
518	–	Thread.sleep(SMALL_DELAY_MS);
519	–	q.put(new Integer(1));
520	–	}
521	–	catch (InterruptedException e) {
522	–	threadUnexpectedException();
523	–	}
524	–	}
525	–	});
526	–
600		joinPool(executor);
601	+	}
602	+
603	+	/**
604	+	* a deserialized serialized queue is usable
605	+	*/
606	+	public void testSerialization() throws Exception {
607	+	SynchronousQueue q = new SynchronousQueue();
608	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
609	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
610	+	out.writeObject(q);
611	+	out.close();
612
613	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
614	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
615	+	SynchronousQueue r = (SynchronousQueue)in.readObject();
616	+	assertEquals(q.size(), r.size());
617	+	while (!q.isEmpty())
618	+	assertEquals(q.remove(), r.remove());
619		}
620
621		/**
622	<	*
622	>	* drainTo(null) throws NPE
623		*/
624	<	public void testSerialization() {
624	>	public void testDrainToNull() {
625		SynchronousQueue q = new SynchronousQueue();
626		try {
627	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
628	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
629	<	out.writeObject(q);
630	<	out.close();
631	<
632	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
633	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
634	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
635	<	assertEquals(q.size(), r.size());
636	<	while (!q.isEmpty())
637	<	assertEquals(q.remove(), r.remove());
638	<	} catch(Exception e){
639	<	unexpectedException();
640	<	}
627	>	q.drainTo(null);
628	>	shouldThrow();
629	>	} catch (NullPointerException success) {}
630	>	}
631	>
632	>	/**
633	>	* drainTo(this) throws IAE
634	>	*/
635	>	public void testDrainToSelf() {
636	>	SynchronousQueue q = new SynchronousQueue();
637	>	try {
638	>	q.drainTo(q);
639	>	shouldThrow();
640	>	} catch (IllegalArgumentException success) {}
641	>	}
642	>
643	>	/**
644	>	* drainTo(c) of empty queue doesn't transfer elements
645	>	*/
646	>	public void testDrainTo() {
647	>	SynchronousQueue q = new SynchronousQueue();
648	>	ArrayList l = new ArrayList();
649	>	q.drainTo(l);
650	>	assertEquals(q.size(), 0);
651	>	assertEquals(l.size(), 0);
652	>	}
653	>
654	>	/**
655	>	* drainTo empties queue, unblocking a waiting put.
656	>	*/
657	>	public void testDrainToWithActivePut() throws InterruptedException {
658	>	final SynchronousQueue q = new SynchronousQueue();
659	>	Thread t = new Thread(new CheckedRunnable() {
660	>	public void realRun() throws InterruptedException {
661	>	q.put(new Integer(1));
662	>	}});
663	>
664	>	t.start();
665	>	ArrayList l = new ArrayList();
666	>	delay(SHORT_DELAY_MS);
667	>	q.drainTo(l);
668	>	assertTrue(l.size() <= 1);
669	>	if (l.size() > 0)
670	>	assertEquals(l.get(0), new Integer(1));
671	>	t.join();
672	>	assertTrue(l.size() <= 1);
673	>	}
674	>
675	>	/**
676	>	* drainTo(null, n) throws NPE
677	>	*/
678	>	public void testDrainToNullN() {
679	>	SynchronousQueue q = new SynchronousQueue();
680	>	try {
681	>	q.drainTo(null, 0);
682	>	shouldThrow();
683	>	} catch (NullPointerException success) {}
684	>	}
685	>
686	>	/**
687	>	* drainTo(this, n) throws IAE
688	>	*/
689	>	public void testDrainToSelfN() {
690	>	SynchronousQueue q = new SynchronousQueue();
691	>	try {
692	>	q.drainTo(q, 0);
693	>	shouldThrow();
694	>	} catch (IllegalArgumentException success) {}
695	>	}
696	>
697	>	/**
698	>	* drainTo(c, n) empties up to n elements of queue into c
699	>	*/
700	>	public void testDrainToN() throws InterruptedException {
701	>	final SynchronousQueue q = new SynchronousQueue();
702	>	Thread t1 = new Thread(new CheckedRunnable() {
703	>	public void realRun() throws InterruptedException {
704	>	q.put(one);
705	>	}});
706	>
707	>	Thread t2 = new Thread(new CheckedRunnable() {
708	>	public void realRun() throws InterruptedException {
709	>	q.put(two);
710	>	}});
711	>
712	>	t1.start();
713	>	t2.start();
714	>	ArrayList l = new ArrayList();
715	>	delay(SHORT_DELAY_MS);
716	>	q.drainTo(l, 1);
717	>	assertEquals(1, l.size());
718	>	q.drainTo(l, 1);
719	>	assertEquals(2, l.size());
720	>	assertTrue(l.contains(one));
721	>	assertTrue(l.contains(two));
722	>	t1.join();
723	>	t2.join();
724		}
725
726		}

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