5 |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
6 |
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*/ |
7 |
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|
8 |
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import static java.util.concurrent.TimeUnit.HOURS; |
9 |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
10 |
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|
11 |
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import java.util.ArrayList; |
12 |
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import java.util.Arrays; |
13 |
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import java.util.Collection; |
14 |
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import java.util.Collections; |
15 |
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import java.util.Deque; |
16 |
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import java.util.HashSet; |
17 |
+ |
import java.util.Iterator; |
18 |
+ |
import java.util.List; |
19 |
+ |
import java.util.NoSuchElementException; |
20 |
+ |
import java.util.Queue; |
21 |
+ |
import java.util.Spliterator; |
22 |
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import java.util.concurrent.BlockingDeque; |
23 |
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import java.util.concurrent.BlockingQueue; |
24 |
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import java.util.concurrent.CountDownLatch; |
25 |
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import java.util.concurrent.Executors; |
26 |
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import java.util.concurrent.ExecutorService; |
27 |
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import java.util.concurrent.Future; |
28 |
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import java.util.concurrent.Phaser; |
29 |
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import java.util.concurrent.ThreadLocalRandom; |
30 |
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import java.util.concurrent.atomic.AtomicBoolean; |
31 |
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import java.util.concurrent.atomic.AtomicLong; |
32 |
+ |
import java.util.concurrent.atomic.AtomicReference; |
33 |
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import java.util.function.Consumer; |
34 |
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import java.util.function.Predicate; |
35 |
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import java.util.stream.Collectors; |
36 |
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|
37 |
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import junit.framework.Test; |
38 |
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|
55 |
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impl); |
56 |
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} |
57 |
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|
58 |
+ |
Object bomb() { |
59 |
+ |
return new Object() { |
60 |
+ |
public boolean equals(Object x) { throw new AssertionError(); } |
61 |
+ |
public int hashCode() { throw new AssertionError(); } |
62 |
+ |
}; |
63 |
+ |
} |
64 |
+ |
|
65 |
+ |
/** Checks properties of empty collections. */ |
66 |
+ |
public void testEmptyMeansEmpty() throws Throwable { |
67 |
+ |
Collection c = impl.emptyCollection(); |
68 |
+ |
emptyMeansEmpty(c); |
69 |
+ |
|
70 |
+ |
if (c instanceof java.io.Serializable) { |
71 |
+ |
try { |
72 |
+ |
emptyMeansEmpty(serialClonePossiblyFailing(c)); |
73 |
+ |
} catch (java.io.NotSerializableException ex) { |
74 |
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// excusable when we have a serializable wrapper around |
75 |
+ |
// a non-serializable collection, as can happen with: |
76 |
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// Vector.subList() => wrapped AbstractList$RandomAccessSubList |
77 |
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if (testImplementationDetails |
78 |
+ |
&& (! c.getClass().getName().matches( |
79 |
+ |
"java.util.Collections.*"))) |
80 |
+ |
throw ex; |
81 |
+ |
} |
82 |
+ |
} |
83 |
+ |
|
84 |
+ |
Collection clone = cloneableClone(c); |
85 |
+ |
if (clone != null) |
86 |
+ |
emptyMeansEmpty(clone); |
87 |
+ |
} |
88 |
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|
89 |
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void emptyMeansEmpty(Collection c) throws InterruptedException { |
90 |
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assertTrue(c.isEmpty()); |
91 |
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assertEquals(0, c.size()); |
92 |
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assertEquals("[]", c.toString()); |
93 |
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{ |
94 |
+ |
Object[] a = c.toArray(); |
95 |
+ |
assertEquals(0, a.length); |
96 |
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assertSame(Object[].class, a.getClass()); |
97 |
+ |
} |
98 |
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{ |
99 |
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Object[] a = new Object[0]; |
100 |
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assertSame(a, c.toArray(a)); |
101 |
+ |
} |
102 |
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{ |
103 |
+ |
Integer[] a = new Integer[0]; |
104 |
+ |
assertSame(a, c.toArray(a)); |
105 |
+ |
} |
106 |
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{ |
107 |
+ |
Integer[] a = { 1, 2, 3}; |
108 |
+ |
assertSame(a, c.toArray(a)); |
109 |
+ |
assertNull(a[0]); |
110 |
+ |
assertSame(2, a[1]); |
111 |
+ |
assertSame(3, a[2]); |
112 |
+ |
} |
113 |
+ |
assertIteratorExhausted(c.iterator()); |
114 |
+ |
Consumer alwaysThrows = e -> { throw new AssertionError(); }; |
115 |
+ |
c.forEach(alwaysThrows); |
116 |
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c.iterator().forEachRemaining(alwaysThrows); |
117 |
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c.spliterator().forEachRemaining(alwaysThrows); |
118 |
+ |
assertFalse(c.spliterator().tryAdvance(alwaysThrows)); |
119 |
+ |
if (c.spliterator().hasCharacteristics(Spliterator.SIZED)) |
120 |
+ |
assertEquals(0, c.spliterator().estimateSize()); |
121 |
+ |
assertFalse(c.contains(bomb())); |
122 |
+ |
assertFalse(c.remove(bomb())); |
123 |
+ |
if (c instanceof Queue) { |
124 |
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Queue q = (Queue) c; |
125 |
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assertNull(q.peek()); |
126 |
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assertNull(q.poll()); |
127 |
+ |
} |
128 |
+ |
if (c instanceof Deque) { |
129 |
+ |
Deque d = (Deque) c; |
130 |
+ |
assertNull(d.peekFirst()); |
131 |
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assertNull(d.peekLast()); |
132 |
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assertNull(d.pollFirst()); |
133 |
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assertNull(d.pollLast()); |
134 |
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assertIteratorExhausted(d.descendingIterator()); |
135 |
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d.descendingIterator().forEachRemaining(alwaysThrows); |
136 |
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assertFalse(d.removeFirstOccurrence(bomb())); |
137 |
+ |
assertFalse(d.removeLastOccurrence(bomb())); |
138 |
+ |
} |
139 |
+ |
if (c instanceof BlockingQueue) { |
140 |
+ |
BlockingQueue q = (BlockingQueue) c; |
141 |
+ |
assertNull(q.poll(0L, MILLISECONDS)); |
142 |
+ |
} |
143 |
+ |
if (c instanceof BlockingDeque) { |
144 |
+ |
BlockingDeque q = (BlockingDeque) c; |
145 |
+ |
assertNull(q.pollFirst(0L, MILLISECONDS)); |
146 |
+ |
assertNull(q.pollLast(0L, MILLISECONDS)); |
147 |
+ |
} |
148 |
+ |
} |
149 |
+ |
|
150 |
+ |
public void testNullPointerExceptions() throws InterruptedException { |
151 |
+ |
Collection c = impl.emptyCollection(); |
152 |
+ |
assertThrows( |
153 |
+ |
NullPointerException.class, |
154 |
+ |
() -> c.addAll(null), |
155 |
+ |
() -> c.containsAll(null), |
156 |
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() -> c.retainAll(null), |
157 |
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() -> c.removeAll(null), |
158 |
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() -> c.removeIf(null), |
159 |
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() -> c.forEach(null), |
160 |
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() -> c.iterator().forEachRemaining(null), |
161 |
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() -> c.spliterator().forEachRemaining(null), |
162 |
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() -> c.spliterator().tryAdvance(null), |
163 |
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() -> c.toArray(null)); |
164 |
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|
165 |
+ |
if (!impl.permitsNulls()) { |
166 |
+ |
assertThrows( |
167 |
+ |
NullPointerException.class, |
168 |
+ |
() -> c.add(null)); |
169 |
+ |
} |
170 |
+ |
if (!impl.permitsNulls() && c instanceof Queue) { |
171 |
+ |
Queue q = (Queue) c; |
172 |
+ |
assertThrows( |
173 |
+ |
NullPointerException.class, |
174 |
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() -> q.offer(null)); |
175 |
+ |
} |
176 |
+ |
if (!impl.permitsNulls() && c instanceof Deque) { |
177 |
+ |
Deque d = (Deque) c; |
178 |
+ |
assertThrows( |
179 |
+ |
NullPointerException.class, |
180 |
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() -> d.addFirst(null), |
181 |
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() -> d.addLast(null), |
182 |
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() -> d.offerFirst(null), |
183 |
+ |
() -> d.offerLast(null), |
184 |
+ |
() -> d.push(null), |
185 |
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() -> d.descendingIterator().forEachRemaining(null)); |
186 |
+ |
} |
187 |
+ |
if (c instanceof BlockingQueue) { |
188 |
+ |
BlockingQueue q = (BlockingQueue) c; |
189 |
+ |
assertThrows( |
190 |
+ |
NullPointerException.class, |
191 |
+ |
() -> { |
192 |
+ |
try { q.offer(null, 1L, HOURS); } |
193 |
+ |
catch (InterruptedException ex) { |
194 |
+ |
throw new AssertionError(ex); |
195 |
+ |
}}, |
196 |
+ |
() -> { |
197 |
+ |
try { q.put(null); } |
198 |
+ |
catch (InterruptedException ex) { |
199 |
+ |
throw new AssertionError(ex); |
200 |
+ |
}}); |
201 |
+ |
} |
202 |
+ |
if (c instanceof BlockingDeque) { |
203 |
+ |
BlockingDeque q = (BlockingDeque) c; |
204 |
+ |
assertThrows( |
205 |
+ |
NullPointerException.class, |
206 |
+ |
() -> { |
207 |
+ |
try { q.offerFirst(null, 1L, HOURS); } |
208 |
+ |
catch (InterruptedException ex) { |
209 |
+ |
throw new AssertionError(ex); |
210 |
+ |
}}, |
211 |
+ |
() -> { |
212 |
+ |
try { q.offerLast(null, 1L, HOURS); } |
213 |
+ |
catch (InterruptedException ex) { |
214 |
+ |
throw new AssertionError(ex); |
215 |
+ |
}}, |
216 |
+ |
() -> { |
217 |
+ |
try { q.putFirst(null); } |
218 |
+ |
catch (InterruptedException ex) { |
219 |
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throw new AssertionError(ex); |
220 |
+ |
}}, |
221 |
+ |
() -> { |
222 |
+ |
try { q.putLast(null); } |
223 |
+ |
catch (InterruptedException ex) { |
224 |
+ |
throw new AssertionError(ex); |
225 |
+ |
}}); |
226 |
+ |
} |
227 |
+ |
} |
228 |
+ |
|
229 |
+ |
public void testNoSuchElementExceptions() { |
230 |
+ |
Collection c = impl.emptyCollection(); |
231 |
+ |
assertThrows( |
232 |
+ |
NoSuchElementException.class, |
233 |
+ |
() -> c.iterator().next()); |
234 |
+ |
|
235 |
+ |
if (c instanceof Queue) { |
236 |
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Queue q = (Queue) c; |
237 |
+ |
assertThrows( |
238 |
+ |
NoSuchElementException.class, |
239 |
+ |
() -> q.element(), |
240 |
+ |
() -> q.remove()); |
241 |
+ |
} |
242 |
+ |
if (c instanceof Deque) { |
243 |
+ |
Deque d = (Deque) c; |
244 |
+ |
assertThrows( |
245 |
+ |
NoSuchElementException.class, |
246 |
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() -> d.getFirst(), |
247 |
+ |
() -> d.getLast(), |
248 |
+ |
() -> d.removeFirst(), |
249 |
+ |
() -> d.removeLast(), |
250 |
+ |
() -> d.pop(), |
251 |
+ |
() -> d.descendingIterator().next()); |
252 |
+ |
} |
253 |
+ |
} |
254 |
+ |
|
255 |
+ |
public void testRemoveIf() { |
256 |
+ |
Collection c = impl.emptyCollection(); |
257 |
+ |
boolean ordered = |
258 |
+ |
c.spliterator().hasCharacteristics(Spliterator.ORDERED); |
259 |
+ |
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
260 |
+ |
int n = rnd.nextInt(6); |
261 |
+ |
for (int i = 0; i < n; i++) c.add(impl.makeElement(i)); |
262 |
+ |
AtomicReference threwAt = new AtomicReference(null); |
263 |
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List orig = rnd.nextBoolean() |
264 |
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? new ArrayList(c) |
265 |
+ |
: Arrays.asList(c.toArray()); |
266 |
+ |
|
267 |
+ |
// Merely creating an iterator can change ArrayBlockingQueue behavior |
268 |
+ |
Iterator it = rnd.nextBoolean() ? c.iterator() : null; |
269 |
+ |
|
270 |
+ |
ArrayList survivors = new ArrayList(); |
271 |
+ |
ArrayList accepts = new ArrayList(); |
272 |
+ |
ArrayList rejects = new ArrayList(); |
273 |
+ |
|
274 |
+ |
Predicate randomPredicate = e -> { |
275 |
+ |
assertNull(threwAt.get()); |
276 |
+ |
switch (rnd.nextInt(3)) { |
277 |
+ |
case 0: accepts.add(e); return true; |
278 |
+ |
case 1: rejects.add(e); return false; |
279 |
+ |
case 2: threwAt.set(e); throw new ArithmeticException(); |
280 |
+ |
default: throw new AssertionError(); |
281 |
+ |
} |
282 |
+ |
}; |
283 |
+ |
try { |
284 |
+ |
try { |
285 |
+ |
boolean modified = c.removeIf(randomPredicate); |
286 |
+ |
assertNull(threwAt.get()); |
287 |
+ |
assertEquals(modified, accepts.size() > 0); |
288 |
+ |
assertEquals(modified, rejects.size() != n); |
289 |
+ |
assertEquals(accepts.size() + rejects.size(), n); |
290 |
+ |
if (ordered) { |
291 |
+ |
assertEquals(rejects, |
292 |
+ |
Arrays.asList(c.toArray())); |
293 |
+ |
} else { |
294 |
+ |
assertEquals(new HashSet(rejects), |
295 |
+ |
new HashSet(Arrays.asList(c.toArray()))); |
296 |
+ |
} |
297 |
+ |
} catch (ArithmeticException ok) { |
298 |
+ |
assertNotNull(threwAt.get()); |
299 |
+ |
assertTrue(c.contains(threwAt.get())); |
300 |
+ |
} |
301 |
+ |
if (it != null && impl.isConcurrent()) |
302 |
+ |
// check for weakly consistent iterator |
303 |
+ |
while (it.hasNext()) assertTrue(orig.contains(it.next())); |
304 |
+ |
switch (rnd.nextInt(4)) { |
305 |
+ |
case 0: survivors.addAll(c); break; |
306 |
+ |
case 1: survivors.addAll(Arrays.asList(c.toArray())); break; |
307 |
+ |
case 2: c.forEach(survivors::add); break; |
308 |
+ |
case 3: for (Object e : c) survivors.add(e); break; |
309 |
+ |
} |
310 |
+ |
assertTrue(orig.containsAll(accepts)); |
311 |
+ |
assertTrue(orig.containsAll(rejects)); |
312 |
+ |
assertTrue(orig.containsAll(survivors)); |
313 |
+ |
assertTrue(orig.containsAll(c)); |
314 |
+ |
assertTrue(c.containsAll(rejects)); |
315 |
+ |
assertTrue(c.containsAll(survivors)); |
316 |
+ |
assertTrue(survivors.containsAll(rejects)); |
317 |
+ |
if (threwAt.get() == null) { |
318 |
+ |
assertEquals(n - accepts.size(), c.size()); |
319 |
+ |
for (Object x : accepts) assertFalse(c.contains(x)); |
320 |
+ |
} else { |
321 |
+ |
// Two acceptable behaviors: entire removeIf call is one |
322 |
+ |
// transaction, or each element processed is one transaction. |
323 |
+ |
assertTrue(n == c.size() || n == c.size() + accepts.size()); |
324 |
+ |
int k = 0; |
325 |
+ |
for (Object x : accepts) if (c.contains(x)) k++; |
326 |
+ |
assertTrue(k == accepts.size() || k == 0); |
327 |
+ |
} |
328 |
+ |
} catch (Throwable ex) { |
329 |
+ |
System.err.println(impl.klazz()); |
330 |
+ |
// c is at risk of corruption if we got here, so be lenient |
331 |
+ |
try { System.err.printf("c=%s%n", c); } |
332 |
+ |
catch (Throwable t) { t.printStackTrace(); } |
333 |
+ |
System.err.printf("n=%d%n", n); |
334 |
+ |
System.err.printf("orig=%s%n", orig); |
335 |
+ |
System.err.printf("accepts=%s%n", accepts); |
336 |
+ |
System.err.printf("rejects=%s%n", rejects); |
337 |
+ |
System.err.printf("survivors=%s%n", survivors); |
338 |
+ |
System.err.printf("threwAt=%s%n", threwAt.get()); |
339 |
+ |
throw ex; |
340 |
+ |
} |
341 |
+ |
} |
342 |
+ |
|
343 |
+ |
/** |
344 |
+ |
* Various ways of traversing a collection yield same elements |
345 |
+ |
*/ |
346 |
+ |
public void testIteratorEquivalence() { |
347 |
+ |
Collection c = impl.emptyCollection(); |
348 |
+ |
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
349 |
+ |
int n = rnd.nextInt(6); |
350 |
+ |
for (int i = 0; i < n; i++) c.add(impl.makeElement(i)); |
351 |
+ |
ArrayList iterated = new ArrayList(); |
352 |
+ |
ArrayList iteratedForEachRemaining = new ArrayList(); |
353 |
+ |
ArrayList tryAdvanced = new ArrayList(); |
354 |
+ |
ArrayList spliterated = new ArrayList(); |
355 |
+ |
ArrayList forEached = new ArrayList(); |
356 |
+ |
ArrayList removeIfed = new ArrayList(); |
357 |
+ |
for (Object x : c) iterated.add(x); |
358 |
+ |
c.iterator().forEachRemaining(iteratedForEachRemaining::add); |
359 |
+ |
for (Spliterator s = c.spliterator(); |
360 |
+ |
s.tryAdvance(tryAdvanced::add); ) {} |
361 |
+ |
c.spliterator().forEachRemaining(spliterated::add); |
362 |
+ |
c.forEach(forEached::add); |
363 |
+ |
c.removeIf(e -> { removeIfed.add(e); return false; }); |
364 |
+ |
boolean ordered = |
365 |
+ |
c.spliterator().hasCharacteristics(Spliterator.ORDERED); |
366 |
+ |
if (c instanceof List || c instanceof Deque) |
367 |
+ |
assertTrue(ordered); |
368 |
+ |
if (ordered) { |
369 |
+ |
assertEquals(iterated, iteratedForEachRemaining); |
370 |
+ |
assertEquals(iterated, tryAdvanced); |
371 |
+ |
assertEquals(iterated, spliterated); |
372 |
+ |
assertEquals(iterated, forEached); |
373 |
+ |
assertEquals(iterated, removeIfed); |
374 |
+ |
} else { |
375 |
+ |
HashSet cset = new HashSet(c); |
376 |
+ |
assertEquals(cset, new HashSet(iterated)); |
377 |
+ |
assertEquals(cset, new HashSet(iteratedForEachRemaining)); |
378 |
+ |
assertEquals(cset, new HashSet(tryAdvanced)); |
379 |
+ |
assertEquals(cset, new HashSet(spliterated)); |
380 |
+ |
assertEquals(cset, new HashSet(forEached)); |
381 |
+ |
assertEquals(cset, new HashSet(removeIfed)); |
382 |
+ |
} |
383 |
+ |
if (c instanceof Deque) { |
384 |
+ |
Deque d = (Deque) c; |
385 |
+ |
ArrayList descending = new ArrayList(); |
386 |
+ |
ArrayList descendingForEachRemaining = new ArrayList(); |
387 |
+ |
for (Iterator it = d.descendingIterator(); it.hasNext(); ) |
388 |
+ |
descending.add(it.next()); |
389 |
+ |
d.descendingIterator().forEachRemaining( |
390 |
+ |
e -> descendingForEachRemaining.add(e)); |
391 |
+ |
Collections.reverse(descending); |
392 |
+ |
Collections.reverse(descendingForEachRemaining); |
393 |
+ |
assertEquals(iterated, descending); |
394 |
+ |
assertEquals(iterated, descendingForEachRemaining); |
395 |
+ |
} |
396 |
+ |
} |
397 |
+ |
|
398 |
+ |
/** |
399 |
+ |
* Calling Iterator#remove() after Iterator#forEachRemaining |
400 |
+ |
* should (maybe) remove last element |
401 |
+ |
*/ |
402 |
+ |
public void testRemoveAfterForEachRemaining() { |
403 |
+ |
Collection c = impl.emptyCollection(); |
404 |
+ |
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
405 |
+ |
testCollection: { |
406 |
+ |
int n = 3 + rnd.nextInt(2); |
407 |
+ |
for (int i = 0; i < n; i++) c.add(impl.makeElement(i)); |
408 |
+ |
Iterator it = c.iterator(); |
409 |
+ |
assertTrue(it.hasNext()); |
410 |
+ |
assertEquals(impl.makeElement(0), it.next()); |
411 |
+ |
assertTrue(it.hasNext()); |
412 |
+ |
assertEquals(impl.makeElement(1), it.next()); |
413 |
+ |
it.forEachRemaining(e -> assertTrue(c.contains(e))); |
414 |
+ |
if (testImplementationDetails) { |
415 |
+ |
if (c instanceof java.util.concurrent.ArrayBlockingQueue) { |
416 |
+ |
assertIteratorExhausted(it); |
417 |
+ |
} else { |
418 |
+ |
try { it.remove(); } |
419 |
+ |
catch (UnsupportedOperationException ok) { |
420 |
+ |
break testCollection; |
421 |
+ |
} |
422 |
+ |
assertEquals(n - 1, c.size()); |
423 |
+ |
for (int i = 0; i < n - 1; i++) |
424 |
+ |
assertTrue(c.contains(impl.makeElement(i))); |
425 |
+ |
assertFalse(c.contains(impl.makeElement(n - 1))); |
426 |
+ |
} |
427 |
+ |
} |
428 |
+ |
} |
429 |
+ |
if (c instanceof Deque) { |
430 |
+ |
Deque d = (Deque) impl.emptyCollection(); |
431 |
+ |
int n = 3 + rnd.nextInt(2); |
432 |
+ |
for (int i = 0; i < n; i++) d.add(impl.makeElement(i)); |
433 |
+ |
Iterator it = d.descendingIterator(); |
434 |
+ |
assertTrue(it.hasNext()); |
435 |
+ |
assertEquals(impl.makeElement(n - 1), it.next()); |
436 |
+ |
assertTrue(it.hasNext()); |
437 |
+ |
assertEquals(impl.makeElement(n - 2), it.next()); |
438 |
+ |
it.forEachRemaining(e -> assertTrue(c.contains(e))); |
439 |
+ |
if (testImplementationDetails) { |
440 |
+ |
it.remove(); |
441 |
+ |
assertEquals(n - 1, d.size()); |
442 |
+ |
for (int i = 1; i < n; i++) |
443 |
+ |
assertTrue(d.contains(impl.makeElement(i))); |
444 |
+ |
assertFalse(d.contains(impl.makeElement(0))); |
445 |
+ |
} |
446 |
+ |
} |
447 |
+ |
} |
448 |
+ |
|
449 |
|
/** |
450 |
|
* stream().forEach returns elements in the collection |
451 |
|
*/ |
455 |
|
final Object x = impl.makeElement(1); |
456 |
|
final Object y = impl.makeElement(2); |
457 |
|
final ArrayList found = new ArrayList(); |
458 |
< |
Consumer<Object> spy = (o) -> { found.add(o); }; |
458 |
> |
Consumer<Object> spy = o -> found.add(o); |
459 |
|
c.stream().forEach(spy); |
460 |
|
assertTrue(found.isEmpty()); |
461 |
|
|
489 |
|
Runnable checkElt = () -> { |
490 |
|
threadsStarted.countDown(); |
491 |
|
while (!done.get()) |
492 |
< |
c.stream().forEach((x) -> { assertSame(x, elt); }); }; |
492 |
> |
c.stream().forEach(x -> assertSame(x, elt)); }; |
493 |
|
Runnable addRemove = () -> { |
494 |
|
threadsStarted.countDown(); |
495 |
|
while (!done.get()) { |
513 |
|
final Object x = impl.makeElement(1); |
514 |
|
final Object y = impl.makeElement(2); |
515 |
|
final ArrayList found = new ArrayList(); |
516 |
< |
Consumer<Object> spy = (o) -> { found.add(o); }; |
516 |
> |
Consumer<Object> spy = o -> found.add(o); |
517 |
|
c.forEach(spy); |
518 |
|
assertTrue(found.isEmpty()); |
519 |
|
|
534 |
|
assertTrue(found.isEmpty()); |
535 |
|
} |
536 |
|
|
537 |
< |
public void testForEachConcurrentStressTest() throws Throwable { |
537 |
> |
/** |
538 |
> |
* Motley crew of threads concurrently randomly hammer the collection. |
539 |
> |
*/ |
540 |
> |
public void testDetectRaces() throws Throwable { |
541 |
|
if (!impl.isConcurrent()) return; |
542 |
+ |
final ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
543 |
|
final Collection c = impl.emptyCollection(); |
544 |
|
final long testDurationMillis = timeoutMillis(); |
545 |
|
final AtomicBoolean done = new AtomicBoolean(false); |
546 |
< |
final Object elt = impl.makeElement(1); |
547 |
< |
final Future<?> f1, f2; |
546 |
> |
final Object one = impl.makeElement(1); |
547 |
> |
final Object two = impl.makeElement(2); |
548 |
> |
final Object[] emptyArray = |
549 |
> |
(Object[]) java.lang.reflect.Array.newInstance(one.getClass(), 0); |
550 |
> |
final List<Future<?>> futures; |
551 |
> |
final Phaser threadsStarted = new Phaser(1); // register this thread |
552 |
> |
final Runnable[] frobbers = { |
553 |
> |
() -> c.forEach(x -> assertTrue(x == one || x == two)), |
554 |
> |
() -> c.stream().forEach(x -> assertTrue(x == one || x == two)), |
555 |
> |
() -> c.spliterator().trySplit(), |
556 |
> |
() -> { |
557 |
> |
Spliterator s = c.spliterator(); |
558 |
> |
s.tryAdvance(x -> assertTrue(x == one || x == two)); |
559 |
> |
s.trySplit(); |
560 |
> |
}, |
561 |
> |
() -> { |
562 |
> |
Spliterator s = c.spliterator(); |
563 |
> |
do {} while (s.tryAdvance(x -> assertTrue(x == one || x == two))); |
564 |
> |
}, |
565 |
> |
() -> { |
566 |
> |
for (Object x : c) assertTrue(x == one || x == two); |
567 |
> |
}, |
568 |
> |
() -> { |
569 |
> |
for (Object x : c.toArray()) assertTrue(x == one || x == two); |
570 |
> |
}, |
571 |
> |
() -> { |
572 |
> |
for (Object x : c.toArray(emptyArray)) assertTrue(x == one || x == two); |
573 |
> |
}, |
574 |
> |
() -> { |
575 |
> |
assertTrue(c.add(one)); |
576 |
> |
assertTrue(c.contains(one)); |
577 |
> |
assertTrue(c.remove(one)); |
578 |
> |
assertFalse(c.contains(one)); |
579 |
> |
}, |
580 |
> |
() -> { |
581 |
> |
assertTrue(c.add(two)); |
582 |
> |
assertTrue(c.contains(two)); |
583 |
> |
assertTrue(c.remove(two)); |
584 |
> |
assertFalse(c.contains(two)); |
585 |
> |
}, |
586 |
> |
}; |
587 |
> |
final List<Runnable> tasks = |
588 |
> |
Arrays.stream(frobbers) |
589 |
> |
.filter(task -> rnd.nextBoolean()) // random subset |
590 |
> |
.map(task -> (Runnable) () -> { |
591 |
> |
threadsStarted.arriveAndAwaitAdvance(); |
592 |
> |
while (!done.get()) |
593 |
> |
task.run(); |
594 |
> |
}) |
595 |
> |
.collect(Collectors.toList()); |
596 |
|
final ExecutorService pool = Executors.newCachedThreadPool(); |
597 |
|
try (PoolCleaner cleaner = cleaner(pool, done)) { |
598 |
< |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
599 |
< |
Runnable checkElt = () -> { |
600 |
< |
threadsStarted.countDown(); |
601 |
< |
while (!done.get()) |
602 |
< |
c.forEach((x) -> { assertSame(x, elt); }); }; |
144 |
< |
Runnable addRemove = () -> { |
145 |
< |
threadsStarted.countDown(); |
146 |
< |
while (!done.get()) { |
147 |
< |
assertTrue(c.add(elt)); |
148 |
< |
assertTrue(c.remove(elt)); |
149 |
< |
}}; |
150 |
< |
f1 = pool.submit(checkElt); |
151 |
< |
f2 = pool.submit(addRemove); |
598 |
> |
threadsStarted.bulkRegister(tasks.size()); |
599 |
> |
futures = tasks.stream() |
600 |
> |
.map(pool::submit) |
601 |
> |
.collect(Collectors.toList()); |
602 |
> |
threadsStarted.arriveAndDeregister(); |
603 |
|
Thread.sleep(testDurationMillis); |
604 |
|
} |
605 |
< |
assertNull(f1.get(0L, MILLISECONDS)); |
606 |
< |
assertNull(f2.get(0L, MILLISECONDS)); |
605 |
> |
for (Future future : futures) |
606 |
> |
assertNull(future.get(0L, MILLISECONDS)); |
607 |
> |
} |
608 |
> |
|
609 |
> |
/** |
610 |
> |
* Spliterators are either IMMUTABLE or truly late-binding or, if |
611 |
> |
* concurrent, use the same "late-binding style" of returning |
612 |
> |
* elements added between creation and first use. |
613 |
> |
*/ |
614 |
> |
public void testLateBindingStyle() { |
615 |
> |
if (!testImplementationDetails) return; |
616 |
> |
if (impl.klazz() == ArrayList.class) return; // for jdk8 |
617 |
> |
// Immutable (snapshot) spliterators are exempt |
618 |
> |
if (impl.emptyCollection().spliterator() |
619 |
> |
.hasCharacteristics(Spliterator.IMMUTABLE)) |
620 |
> |
return; |
621 |
> |
final Object one = impl.makeElement(1); |
622 |
> |
{ |
623 |
> |
final Collection c = impl.emptyCollection(); |
624 |
> |
final Spliterator split = c.spliterator(); |
625 |
> |
c.add(one); |
626 |
> |
assertTrue(split.tryAdvance(e -> { assertSame(e, one); })); |
627 |
> |
assertFalse(split.tryAdvance(e -> { throw new AssertionError(); })); |
628 |
> |
assertTrue(c.contains(one)); |
629 |
> |
} |
630 |
> |
{ |
631 |
> |
final AtomicLong count = new AtomicLong(0); |
632 |
> |
final Collection c = impl.emptyCollection(); |
633 |
> |
final Spliterator split = c.spliterator(); |
634 |
> |
c.add(one); |
635 |
> |
split.forEachRemaining( |
636 |
> |
e -> { assertSame(e, one); count.getAndIncrement(); }); |
637 |
> |
assertEquals(1L, count.get()); |
638 |
> |
assertFalse(split.tryAdvance(e -> { throw new AssertionError(); })); |
639 |
> |
assertTrue(c.contains(one)); |
640 |
> |
} |
641 |
|
} |
642 |
|
|
643 |
< |
// public void testCollection8DebugFail() { fail(); } |
643 |
> |
// public void testCollection8DebugFail() { |
644 |
> |
// fail(impl.klazz().getSimpleName()); |
645 |
> |
// } |
646 |
|
} |