1 |
jsr166 |
1.1 |
/* |
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* Written by Doug Lea and Martin Buchholz with assistance from |
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* members of JCP JSR-166 Expert Group and released to the public |
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* domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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8 |
jsr166 |
1.16 |
import static java.util.concurrent.TimeUnit.HOURS; |
9 |
jsr166 |
1.1 |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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import java.util.ArrayList; |
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jsr166 |
1.18 |
import java.util.Arrays; |
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jsr166 |
1.1 |
import java.util.Collection; |
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import java.util.Collections; |
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jsr166 |
1.5 |
import java.util.Deque; |
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import java.util.HashSet; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.NoSuchElementException; |
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import java.util.Queue; |
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import java.util.Spliterator; |
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jsr166 |
1.14 |
import java.util.concurrent.BlockingDeque; |
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import java.util.concurrent.BlockingQueue; |
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jsr166 |
1.32 |
import java.util.concurrent.ConcurrentLinkedQueue; |
25 |
jsr166 |
1.2 |
import java.util.concurrent.CountDownLatch; |
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jsr166 |
1.1 |
import java.util.concurrent.Executors; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.Future; |
29 |
jsr166 |
1.26 |
import java.util.concurrent.Phaser; |
30 |
jsr166 |
1.5 |
import java.util.concurrent.ThreadLocalRandom; |
31 |
jsr166 |
1.1 |
import java.util.concurrent.atomic.AtomicBoolean; |
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import java.util.concurrent.atomic.AtomicLong; |
33 |
jsr166 |
1.5 |
import java.util.concurrent.atomic.AtomicReference; |
34 |
jsr166 |
1.1 |
import java.util.function.Consumer; |
35 |
jsr166 |
1.5 |
import java.util.function.Predicate; |
36 |
jsr166 |
1.26 |
import java.util.stream.Collectors; |
37 |
jsr166 |
1.1 |
|
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import junit.framework.Test; |
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/** |
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* Contains tests applicable to all jdk8+ Collection implementations. |
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* An extension of CollectionTest. |
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*/ |
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public class Collection8Test extends JSR166TestCase { |
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final CollectionImplementation impl; |
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/** Tests are parameterized by a Collection implementation. */ |
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Collection8Test(CollectionImplementation impl, String methodName) { |
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super(methodName); |
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this.impl = impl; |
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} |
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public static Test testSuite(CollectionImplementation impl) { |
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return parameterizedTestSuite(Collection8Test.class, |
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CollectionImplementation.class, |
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impl); |
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} |
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59 |
jsr166 |
1.10 |
Object bomb() { |
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return new Object() { |
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public boolean equals(Object x) { throw new AssertionError(); } |
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public int hashCode() { throw new AssertionError(); } |
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}; |
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} |
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jsr166 |
1.5 |
/** Checks properties of empty collections. */ |
67 |
jsr166 |
1.24 |
public void testEmptyMeansEmpty() throws Throwable { |
68 |
jsr166 |
1.5 |
Collection c = impl.emptyCollection(); |
69 |
jsr166 |
1.12 |
emptyMeansEmpty(c); |
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jsr166 |
1.24 |
if (c instanceof java.io.Serializable) { |
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try { |
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emptyMeansEmpty(serialClonePossiblyFailing(c)); |
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} catch (java.io.NotSerializableException ex) { |
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// excusable when we have a serializable wrapper around |
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// a non-serializable collection, as can happen with: |
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// Vector.subList() => wrapped AbstractList$RandomAccessSubList |
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if (testImplementationDetails |
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&& (! c.getClass().getName().matches( |
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"java.util.Collections.*"))) |
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throw ex; |
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} |
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} |
84 |
jsr166 |
1.12 |
|
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Collection clone = cloneableClone(c); |
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if (clone != null) |
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emptyMeansEmpty(clone); |
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} |
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90 |
jsr166 |
1.14 |
void emptyMeansEmpty(Collection c) throws InterruptedException { |
91 |
jsr166 |
1.5 |
assertTrue(c.isEmpty()); |
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assertEquals(0, c.size()); |
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assertEquals("[]", c.toString()); |
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{ |
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Object[] a = c.toArray(); |
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assertEquals(0, a.length); |
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assertSame(Object[].class, a.getClass()); |
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} |
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{ |
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Object[] a = new Object[0]; |
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assertSame(a, c.toArray(a)); |
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} |
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{ |
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Integer[] a = new Integer[0]; |
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assertSame(a, c.toArray(a)); |
106 |
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} |
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{ |
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Integer[] a = { 1, 2, 3}; |
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assertSame(a, c.toArray(a)); |
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assertNull(a[0]); |
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assertSame(2, a[1]); |
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assertSame(3, a[2]); |
113 |
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} |
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assertIteratorExhausted(c.iterator()); |
115 |
jsr166 |
1.19 |
Consumer alwaysThrows = e -> { throw new AssertionError(); }; |
116 |
jsr166 |
1.5 |
c.forEach(alwaysThrows); |
117 |
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c.iterator().forEachRemaining(alwaysThrows); |
118 |
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c.spliterator().forEachRemaining(alwaysThrows); |
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assertFalse(c.spliterator().tryAdvance(alwaysThrows)); |
120 |
jsr166 |
1.9 |
if (c.spliterator().hasCharacteristics(Spliterator.SIZED)) |
121 |
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assertEquals(0, c.spliterator().estimateSize()); |
122 |
jsr166 |
1.10 |
assertFalse(c.contains(bomb())); |
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assertFalse(c.remove(bomb())); |
124 |
jsr166 |
1.11 |
if (c instanceof Queue) { |
125 |
jsr166 |
1.5 |
Queue q = (Queue) c; |
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assertNull(q.peek()); |
127 |
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assertNull(q.poll()); |
128 |
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} |
129 |
jsr166 |
1.11 |
if (c instanceof Deque) { |
130 |
jsr166 |
1.5 |
Deque d = (Deque) c; |
131 |
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assertNull(d.peekFirst()); |
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assertNull(d.peekLast()); |
133 |
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assertNull(d.pollFirst()); |
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assertNull(d.pollLast()); |
135 |
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assertIteratorExhausted(d.descendingIterator()); |
136 |
jsr166 |
1.9 |
d.descendingIterator().forEachRemaining(alwaysThrows); |
137 |
jsr166 |
1.10 |
assertFalse(d.removeFirstOccurrence(bomb())); |
138 |
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assertFalse(d.removeLastOccurrence(bomb())); |
139 |
jsr166 |
1.5 |
} |
140 |
jsr166 |
1.14 |
if (c instanceof BlockingQueue) { |
141 |
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BlockingQueue q = (BlockingQueue) c; |
142 |
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assertNull(q.poll(0L, MILLISECONDS)); |
143 |
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} |
144 |
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if (c instanceof BlockingDeque) { |
145 |
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BlockingDeque q = (BlockingDeque) c; |
146 |
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assertNull(q.pollFirst(0L, MILLISECONDS)); |
147 |
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assertNull(q.pollLast(0L, MILLISECONDS)); |
148 |
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} |
149 |
jsr166 |
1.5 |
} |
150 |
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151 |
jsr166 |
1.14 |
public void testNullPointerExceptions() throws InterruptedException { |
152 |
jsr166 |
1.5 |
Collection c = impl.emptyCollection(); |
153 |
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assertThrows( |
154 |
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NullPointerException.class, |
155 |
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() -> c.addAll(null), |
156 |
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() -> c.containsAll(null), |
157 |
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() -> c.retainAll(null), |
158 |
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() -> c.removeAll(null), |
159 |
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() -> c.removeIf(null), |
160 |
jsr166 |
1.6 |
() -> c.forEach(null), |
161 |
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() -> c.iterator().forEachRemaining(null), |
162 |
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() -> c.spliterator().forEachRemaining(null), |
163 |
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() -> c.spliterator().tryAdvance(null), |
164 |
jsr166 |
1.5 |
() -> c.toArray(null)); |
165 |
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166 |
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if (!impl.permitsNulls()) { |
167 |
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assertThrows( |
168 |
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NullPointerException.class, |
169 |
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() -> c.add(null)); |
170 |
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} |
171 |
jsr166 |
1.14 |
if (!impl.permitsNulls() && c instanceof Queue) { |
172 |
jsr166 |
1.5 |
Queue q = (Queue) c; |
173 |
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assertThrows( |
174 |
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NullPointerException.class, |
175 |
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() -> q.offer(null)); |
176 |
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} |
177 |
jsr166 |
1.14 |
if (!impl.permitsNulls() && c instanceof Deque) { |
178 |
jsr166 |
1.5 |
Deque d = (Deque) c; |
179 |
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assertThrows( |
180 |
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NullPointerException.class, |
181 |
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() -> d.addFirst(null), |
182 |
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() -> d.addLast(null), |
183 |
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() -> d.offerFirst(null), |
184 |
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() -> d.offerLast(null), |
185 |
jsr166 |
1.6 |
() -> d.push(null), |
186 |
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() -> d.descendingIterator().forEachRemaining(null)); |
187 |
jsr166 |
1.5 |
} |
188 |
jsr166 |
1.15 |
if (c instanceof BlockingQueue) { |
189 |
jsr166 |
1.14 |
BlockingQueue q = (BlockingQueue) c; |
190 |
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assertThrows( |
191 |
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NullPointerException.class, |
192 |
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() -> { |
193 |
jsr166 |
1.16 |
try { q.offer(null, 1L, HOURS); } |
194 |
jsr166 |
1.14 |
catch (InterruptedException ex) { |
195 |
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throw new AssertionError(ex); |
196 |
jsr166 |
1.15 |
}}, |
197 |
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() -> { |
198 |
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try { q.put(null); } |
199 |
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catch (InterruptedException ex) { |
200 |
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throw new AssertionError(ex); |
201 |
jsr166 |
1.14 |
}}); |
202 |
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} |
203 |
jsr166 |
1.15 |
if (c instanceof BlockingDeque) { |
204 |
jsr166 |
1.14 |
BlockingDeque q = (BlockingDeque) c; |
205 |
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assertThrows( |
206 |
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NullPointerException.class, |
207 |
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() -> { |
208 |
jsr166 |
1.16 |
try { q.offerFirst(null, 1L, HOURS); } |
209 |
jsr166 |
1.14 |
catch (InterruptedException ex) { |
210 |
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throw new AssertionError(ex); |
211 |
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}}, |
212 |
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() -> { |
213 |
jsr166 |
1.16 |
try { q.offerLast(null, 1L, HOURS); } |
214 |
jsr166 |
1.14 |
catch (InterruptedException ex) { |
215 |
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throw new AssertionError(ex); |
216 |
jsr166 |
1.15 |
}}, |
217 |
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() -> { |
218 |
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try { q.putFirst(null); } |
219 |
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catch (InterruptedException ex) { |
220 |
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throw new AssertionError(ex); |
221 |
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}}, |
222 |
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() -> { |
223 |
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try { q.putLast(null); } |
224 |
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catch (InterruptedException ex) { |
225 |
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throw new AssertionError(ex); |
226 |
jsr166 |
1.14 |
}}); |
227 |
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} |
228 |
jsr166 |
1.5 |
} |
229 |
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|
230 |
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public void testNoSuchElementExceptions() { |
231 |
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Collection c = impl.emptyCollection(); |
232 |
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assertThrows( |
233 |
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NoSuchElementException.class, |
234 |
|
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() -> c.iterator().next()); |
235 |
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|
236 |
jsr166 |
1.14 |
if (c instanceof Queue) { |
237 |
jsr166 |
1.5 |
Queue q = (Queue) c; |
238 |
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assertThrows( |
239 |
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NoSuchElementException.class, |
240 |
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() -> q.element(), |
241 |
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() -> q.remove()); |
242 |
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} |
243 |
jsr166 |
1.14 |
if (c instanceof Deque) { |
244 |
jsr166 |
1.5 |
Deque d = (Deque) c; |
245 |
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assertThrows( |
246 |
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NoSuchElementException.class, |
247 |
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() -> d.getFirst(), |
248 |
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() -> d.getLast(), |
249 |
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() -> d.removeFirst(), |
250 |
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() -> d.removeLast(), |
251 |
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() -> d.pop(), |
252 |
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() -> d.descendingIterator().next()); |
253 |
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} |
254 |
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} |
255 |
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|
256 |
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public void testRemoveIf() { |
257 |
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Collection c = impl.emptyCollection(); |
258 |
jsr166 |
1.22 |
boolean ordered = |
259 |
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c.spliterator().hasCharacteristics(Spliterator.ORDERED); |
260 |
jsr166 |
1.5 |
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
261 |
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int n = rnd.nextInt(6); |
262 |
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for (int i = 0; i < n; i++) c.add(impl.makeElement(i)); |
263 |
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AtomicReference threwAt = new AtomicReference(null); |
264 |
jsr166 |
1.18 |
List orig = rnd.nextBoolean() |
265 |
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? new ArrayList(c) |
266 |
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: Arrays.asList(c.toArray()); |
267 |
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|
268 |
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// Merely creating an iterator can change ArrayBlockingQueue behavior |
269 |
|
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Iterator it = rnd.nextBoolean() ? c.iterator() : null; |
270 |
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271 |
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ArrayList survivors = new ArrayList(); |
272 |
jsr166 |
1.5 |
ArrayList accepts = new ArrayList(); |
273 |
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ArrayList rejects = new ArrayList(); |
274 |
jsr166 |
1.18 |
|
275 |
jsr166 |
1.19 |
Predicate randomPredicate = e -> { |
276 |
jsr166 |
1.5 |
assertNull(threwAt.get()); |
277 |
|
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switch (rnd.nextInt(3)) { |
278 |
|
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case 0: accepts.add(e); return true; |
279 |
|
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case 1: rejects.add(e); return false; |
280 |
|
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case 2: threwAt.set(e); throw new ArithmeticException(); |
281 |
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default: throw new AssertionError(); |
282 |
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} |
283 |
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}; |
284 |
|
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try { |
285 |
jsr166 |
1.7 |
try { |
286 |
|
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boolean modified = c.removeIf(randomPredicate); |
287 |
jsr166 |
1.18 |
assertNull(threwAt.get()); |
288 |
|
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assertEquals(modified, accepts.size() > 0); |
289 |
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assertEquals(modified, rejects.size() != n); |
290 |
|
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assertEquals(accepts.size() + rejects.size(), n); |
291 |
jsr166 |
1.22 |
if (ordered) { |
292 |
|
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assertEquals(rejects, |
293 |
|
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Arrays.asList(c.toArray())); |
294 |
|
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} else { |
295 |
|
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assertEquals(new HashSet(rejects), |
296 |
|
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new HashSet(Arrays.asList(c.toArray()))); |
297 |
|
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} |
298 |
jsr166 |
1.18 |
} catch (ArithmeticException ok) { |
299 |
|
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assertNotNull(threwAt.get()); |
300 |
|
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assertTrue(c.contains(threwAt.get())); |
301 |
|
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} |
302 |
|
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if (it != null && impl.isConcurrent()) |
303 |
|
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// check for weakly consistent iterator |
304 |
|
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while (it.hasNext()) assertTrue(orig.contains(it.next())); |
305 |
|
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switch (rnd.nextInt(4)) { |
306 |
|
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case 0: survivors.addAll(c); break; |
307 |
|
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case 1: survivors.addAll(Arrays.asList(c.toArray())); break; |
308 |
jsr166 |
1.28 |
case 2: c.forEach(survivors::add); break; |
309 |
jsr166 |
1.18 |
case 3: for (Object e : c) survivors.add(e); break; |
310 |
|
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} |
311 |
|
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assertTrue(orig.containsAll(accepts)); |
312 |
|
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assertTrue(orig.containsAll(rejects)); |
313 |
|
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assertTrue(orig.containsAll(survivors)); |
314 |
|
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assertTrue(orig.containsAll(c)); |
315 |
|
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assertTrue(c.containsAll(rejects)); |
316 |
jsr166 |
1.7 |
assertTrue(c.containsAll(survivors)); |
317 |
|
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assertTrue(survivors.containsAll(rejects)); |
318 |
jsr166 |
1.22 |
if (threwAt.get() == null) { |
319 |
|
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assertEquals(n - accepts.size(), c.size()); |
320 |
|
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for (Object x : accepts) assertFalse(c.contains(x)); |
321 |
|
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} else { |
322 |
|
|
// Two acceptable behaviors: entire removeIf call is one |
323 |
|
|
// transaction, or each element processed is one transaction. |
324 |
|
|
assertTrue(n == c.size() || n == c.size() + accepts.size()); |
325 |
|
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int k = 0; |
326 |
|
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for (Object x : accepts) if (c.contains(x)) k++; |
327 |
|
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assertTrue(k == accepts.size() || k == 0); |
328 |
|
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} |
329 |
jsr166 |
1.7 |
} catch (Throwable ex) { |
330 |
jsr166 |
1.5 |
System.err.println(impl.klazz()); |
331 |
jsr166 |
1.23 |
// c is at risk of corruption if we got here, so be lenient |
332 |
|
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try { System.err.printf("c=%s%n", c); } |
333 |
|
|
catch (Throwable t) { t.printStackTrace(); } |
334 |
jsr166 |
1.7 |
System.err.printf("n=%d%n", n); |
335 |
jsr166 |
1.18 |
System.err.printf("orig=%s%n", orig); |
336 |
jsr166 |
1.7 |
System.err.printf("accepts=%s%n", accepts); |
337 |
|
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System.err.printf("rejects=%s%n", rejects); |
338 |
jsr166 |
1.8 |
System.err.printf("survivors=%s%n", survivors); |
339 |
jsr166 |
1.18 |
System.err.printf("threwAt=%s%n", threwAt.get()); |
340 |
jsr166 |
1.7 |
throw ex; |
341 |
jsr166 |
1.5 |
} |
342 |
|
|
} |
343 |
|
|
|
344 |
|
|
/** |
345 |
|
|
* Various ways of traversing a collection yield same elements |
346 |
|
|
*/ |
347 |
|
|
public void testIteratorEquivalence() { |
348 |
|
|
Collection c = impl.emptyCollection(); |
349 |
|
|
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
350 |
|
|
int n = rnd.nextInt(6); |
351 |
|
|
for (int i = 0; i < n; i++) c.add(impl.makeElement(i)); |
352 |
|
|
ArrayList iterated = new ArrayList(); |
353 |
|
|
ArrayList iteratedForEachRemaining = new ArrayList(); |
354 |
jsr166 |
1.13 |
ArrayList tryAdvanced = new ArrayList(); |
355 |
jsr166 |
1.5 |
ArrayList spliterated = new ArrayList(); |
356 |
jsr166 |
1.33 |
ArrayList splitonced = new ArrayList(); |
357 |
jsr166 |
1.13 |
ArrayList forEached = new ArrayList(); |
358 |
jsr166 |
1.32 |
ArrayList streamForEached = new ArrayList(); |
359 |
|
|
ConcurrentLinkedQueue parallelStreamForEached = new ConcurrentLinkedQueue(); |
360 |
jsr166 |
1.13 |
ArrayList removeIfed = new ArrayList(); |
361 |
jsr166 |
1.5 |
for (Object x : c) iterated.add(x); |
362 |
jsr166 |
1.28 |
c.iterator().forEachRemaining(iteratedForEachRemaining::add); |
363 |
jsr166 |
1.13 |
for (Spliterator s = c.spliterator(); |
364 |
jsr166 |
1.28 |
s.tryAdvance(tryAdvanced::add); ) {} |
365 |
|
|
c.spliterator().forEachRemaining(spliterated::add); |
366 |
jsr166 |
1.33 |
{ // trySplit returns "strict prefix" |
367 |
|
|
Spliterator s1 = c.spliterator(), s2 = s1.trySplit(); |
368 |
|
|
if (s2 != null) s2.forEachRemaining(splitonced::add); |
369 |
|
|
s1.forEachRemaining(splitonced::add); |
370 |
|
|
} |
371 |
jsr166 |
1.28 |
c.forEach(forEached::add); |
372 |
jsr166 |
1.32 |
c.stream().forEach(streamForEached::add); |
373 |
|
|
c.parallelStream().forEach(parallelStreamForEached::add); |
374 |
jsr166 |
1.13 |
c.removeIf(e -> { removeIfed.add(e); return false; }); |
375 |
jsr166 |
1.5 |
boolean ordered = |
376 |
|
|
c.spliterator().hasCharacteristics(Spliterator.ORDERED); |
377 |
|
|
if (c instanceof List || c instanceof Deque) |
378 |
|
|
assertTrue(ordered); |
379 |
jsr166 |
1.32 |
HashSet cset = new HashSet(c); |
380 |
|
|
assertEquals(cset, new HashSet(parallelStreamForEached)); |
381 |
jsr166 |
1.5 |
if (ordered) { |
382 |
|
|
assertEquals(iterated, iteratedForEachRemaining); |
383 |
jsr166 |
1.13 |
assertEquals(iterated, tryAdvanced); |
384 |
jsr166 |
1.5 |
assertEquals(iterated, spliterated); |
385 |
jsr166 |
1.33 |
assertEquals(iterated, splitonced); |
386 |
jsr166 |
1.13 |
assertEquals(iterated, forEached); |
387 |
jsr166 |
1.32 |
assertEquals(iterated, streamForEached); |
388 |
jsr166 |
1.13 |
assertEquals(iterated, removeIfed); |
389 |
jsr166 |
1.5 |
} else { |
390 |
|
|
assertEquals(cset, new HashSet(iterated)); |
391 |
|
|
assertEquals(cset, new HashSet(iteratedForEachRemaining)); |
392 |
jsr166 |
1.13 |
assertEquals(cset, new HashSet(tryAdvanced)); |
393 |
jsr166 |
1.5 |
assertEquals(cset, new HashSet(spliterated)); |
394 |
jsr166 |
1.33 |
assertEquals(cset, new HashSet(splitonced)); |
395 |
jsr166 |
1.13 |
assertEquals(cset, new HashSet(forEached)); |
396 |
jsr166 |
1.32 |
assertEquals(cset, new HashSet(streamForEached)); |
397 |
jsr166 |
1.13 |
assertEquals(cset, new HashSet(removeIfed)); |
398 |
jsr166 |
1.5 |
} |
399 |
|
|
if (c instanceof Deque) { |
400 |
|
|
Deque d = (Deque) c; |
401 |
|
|
ArrayList descending = new ArrayList(); |
402 |
|
|
ArrayList descendingForEachRemaining = new ArrayList(); |
403 |
|
|
for (Iterator it = d.descendingIterator(); it.hasNext(); ) |
404 |
|
|
descending.add(it.next()); |
405 |
|
|
d.descendingIterator().forEachRemaining( |
406 |
|
|
e -> descendingForEachRemaining.add(e)); |
407 |
|
|
Collections.reverse(descending); |
408 |
|
|
Collections.reverse(descendingForEachRemaining); |
409 |
|
|
assertEquals(iterated, descending); |
410 |
|
|
assertEquals(iterated, descendingForEachRemaining); |
411 |
|
|
} |
412 |
|
|
} |
413 |
|
|
|
414 |
|
|
/** |
415 |
|
|
* Calling Iterator#remove() after Iterator#forEachRemaining |
416 |
jsr166 |
1.21 |
* should (maybe) remove last element |
417 |
jsr166 |
1.5 |
*/ |
418 |
|
|
public void testRemoveAfterForEachRemaining() { |
419 |
|
|
Collection c = impl.emptyCollection(); |
420 |
|
|
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
421 |
jsr166 |
1.25 |
testCollection: { |
422 |
jsr166 |
1.5 |
int n = 3 + rnd.nextInt(2); |
423 |
|
|
for (int i = 0; i < n; i++) c.add(impl.makeElement(i)); |
424 |
|
|
Iterator it = c.iterator(); |
425 |
|
|
assertTrue(it.hasNext()); |
426 |
|
|
assertEquals(impl.makeElement(0), it.next()); |
427 |
|
|
assertTrue(it.hasNext()); |
428 |
|
|
assertEquals(impl.makeElement(1), it.next()); |
429 |
jsr166 |
1.21 |
it.forEachRemaining(e -> assertTrue(c.contains(e))); |
430 |
|
|
if (testImplementationDetails) { |
431 |
|
|
if (c instanceof java.util.concurrent.ArrayBlockingQueue) { |
432 |
|
|
assertIteratorExhausted(it); |
433 |
|
|
} else { |
434 |
jsr166 |
1.25 |
try { it.remove(); } |
435 |
|
|
catch (UnsupportedOperationException ok) { |
436 |
|
|
break testCollection; |
437 |
|
|
} |
438 |
jsr166 |
1.21 |
assertEquals(n - 1, c.size()); |
439 |
|
|
for (int i = 0; i < n - 1; i++) |
440 |
|
|
assertTrue(c.contains(impl.makeElement(i))); |
441 |
|
|
assertFalse(c.contains(impl.makeElement(n - 1))); |
442 |
|
|
} |
443 |
|
|
} |
444 |
jsr166 |
1.5 |
} |
445 |
|
|
if (c instanceof Deque) { |
446 |
|
|
Deque d = (Deque) impl.emptyCollection(); |
447 |
|
|
int n = 3 + rnd.nextInt(2); |
448 |
|
|
for (int i = 0; i < n; i++) d.add(impl.makeElement(i)); |
449 |
|
|
Iterator it = d.descendingIterator(); |
450 |
|
|
assertTrue(it.hasNext()); |
451 |
|
|
assertEquals(impl.makeElement(n - 1), it.next()); |
452 |
|
|
assertTrue(it.hasNext()); |
453 |
|
|
assertEquals(impl.makeElement(n - 2), it.next()); |
454 |
jsr166 |
1.21 |
it.forEachRemaining(e -> assertTrue(c.contains(e))); |
455 |
|
|
if (testImplementationDetails) { |
456 |
|
|
it.remove(); |
457 |
|
|
assertEquals(n - 1, d.size()); |
458 |
|
|
for (int i = 1; i < n; i++) |
459 |
|
|
assertTrue(d.contains(impl.makeElement(i))); |
460 |
|
|
assertFalse(d.contains(impl.makeElement(0))); |
461 |
|
|
} |
462 |
jsr166 |
1.5 |
} |
463 |
|
|
} |
464 |
|
|
|
465 |
jsr166 |
1.1 |
/** |
466 |
|
|
* stream().forEach returns elements in the collection |
467 |
|
|
*/ |
468 |
jsr166 |
1.3 |
public void testStreamForEach() throws Throwable { |
469 |
jsr166 |
1.1 |
final Collection c = impl.emptyCollection(); |
470 |
|
|
final AtomicLong count = new AtomicLong(0L); |
471 |
|
|
final Object x = impl.makeElement(1); |
472 |
|
|
final Object y = impl.makeElement(2); |
473 |
|
|
final ArrayList found = new ArrayList(); |
474 |
jsr166 |
1.20 |
Consumer<Object> spy = o -> found.add(o); |
475 |
jsr166 |
1.1 |
c.stream().forEach(spy); |
476 |
|
|
assertTrue(found.isEmpty()); |
477 |
|
|
|
478 |
|
|
assertTrue(c.add(x)); |
479 |
|
|
c.stream().forEach(spy); |
480 |
|
|
assertEquals(Collections.singletonList(x), found); |
481 |
|
|
found.clear(); |
482 |
|
|
|
483 |
|
|
assertTrue(c.add(y)); |
484 |
|
|
c.stream().forEach(spy); |
485 |
|
|
assertEquals(2, found.size()); |
486 |
|
|
assertTrue(found.contains(x)); |
487 |
|
|
assertTrue(found.contains(y)); |
488 |
|
|
found.clear(); |
489 |
|
|
|
490 |
|
|
c.clear(); |
491 |
|
|
c.stream().forEach(spy); |
492 |
|
|
assertTrue(found.isEmpty()); |
493 |
|
|
} |
494 |
|
|
|
495 |
jsr166 |
1.3 |
public void testStreamForEachConcurrentStressTest() throws Throwable { |
496 |
|
|
if (!impl.isConcurrent()) return; |
497 |
|
|
final Collection c = impl.emptyCollection(); |
498 |
|
|
final long testDurationMillis = timeoutMillis(); |
499 |
|
|
final AtomicBoolean done = new AtomicBoolean(false); |
500 |
|
|
final Object elt = impl.makeElement(1); |
501 |
|
|
final Future<?> f1, f2; |
502 |
|
|
final ExecutorService pool = Executors.newCachedThreadPool(); |
503 |
|
|
try (PoolCleaner cleaner = cleaner(pool, done)) { |
504 |
|
|
final CountDownLatch threadsStarted = new CountDownLatch(2); |
505 |
|
|
Runnable checkElt = () -> { |
506 |
|
|
threadsStarted.countDown(); |
507 |
|
|
while (!done.get()) |
508 |
jsr166 |
1.20 |
c.stream().forEach(x -> assertSame(x, elt)); }; |
509 |
jsr166 |
1.3 |
Runnable addRemove = () -> { |
510 |
|
|
threadsStarted.countDown(); |
511 |
|
|
while (!done.get()) { |
512 |
|
|
assertTrue(c.add(elt)); |
513 |
|
|
assertTrue(c.remove(elt)); |
514 |
|
|
}}; |
515 |
|
|
f1 = pool.submit(checkElt); |
516 |
|
|
f2 = pool.submit(addRemove); |
517 |
|
|
Thread.sleep(testDurationMillis); |
518 |
|
|
} |
519 |
|
|
assertNull(f1.get(0L, MILLISECONDS)); |
520 |
|
|
assertNull(f2.get(0L, MILLISECONDS)); |
521 |
|
|
} |
522 |
|
|
|
523 |
|
|
/** |
524 |
|
|
* collection.forEach returns elements in the collection |
525 |
|
|
*/ |
526 |
|
|
public void testForEach() throws Throwable { |
527 |
|
|
final Collection c = impl.emptyCollection(); |
528 |
|
|
final AtomicLong count = new AtomicLong(0L); |
529 |
|
|
final Object x = impl.makeElement(1); |
530 |
|
|
final Object y = impl.makeElement(2); |
531 |
|
|
final ArrayList found = new ArrayList(); |
532 |
jsr166 |
1.20 |
Consumer<Object> spy = o -> found.add(o); |
533 |
jsr166 |
1.3 |
c.forEach(spy); |
534 |
|
|
assertTrue(found.isEmpty()); |
535 |
|
|
|
536 |
|
|
assertTrue(c.add(x)); |
537 |
|
|
c.forEach(spy); |
538 |
|
|
assertEquals(Collections.singletonList(x), found); |
539 |
|
|
found.clear(); |
540 |
|
|
|
541 |
|
|
assertTrue(c.add(y)); |
542 |
|
|
c.forEach(spy); |
543 |
|
|
assertEquals(2, found.size()); |
544 |
|
|
assertTrue(found.contains(x)); |
545 |
|
|
assertTrue(found.contains(y)); |
546 |
|
|
found.clear(); |
547 |
|
|
|
548 |
|
|
c.clear(); |
549 |
|
|
c.forEach(spy); |
550 |
|
|
assertTrue(found.isEmpty()); |
551 |
|
|
} |
552 |
|
|
|
553 |
jsr166 |
1.26 |
/** |
554 |
|
|
* Motley crew of threads concurrently randomly hammer the collection. |
555 |
|
|
*/ |
556 |
|
|
public void testDetectRaces() throws Throwable { |
557 |
jsr166 |
1.1 |
if (!impl.isConcurrent()) return; |
558 |
jsr166 |
1.26 |
final ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
559 |
jsr166 |
1.1 |
final Collection c = impl.emptyCollection(); |
560 |
jsr166 |
1.34 |
final long testDurationMillis |
561 |
|
|
= expensiveTests ? LONG_DELAY_MS : timeoutMillis(); |
562 |
jsr166 |
1.1 |
final AtomicBoolean done = new AtomicBoolean(false); |
563 |
jsr166 |
1.26 |
final Object one = impl.makeElement(1); |
564 |
|
|
final Object two = impl.makeElement(2); |
565 |
jsr166 |
1.35 |
final Consumer checkSanity = x -> assertTrue(x == one || x == two); |
566 |
jsr166 |
1.36 |
final Consumer<Object[]> checkArraySanity = array -> { |
567 |
|
|
assertTrue(array.length <= 2); |
568 |
|
|
for (Object x : array) assertTrue(x == one || x == two); |
569 |
|
|
}; |
570 |
jsr166 |
1.29 |
final Object[] emptyArray = |
571 |
|
|
(Object[]) java.lang.reflect.Array.newInstance(one.getClass(), 0); |
572 |
jsr166 |
1.26 |
final List<Future<?>> futures; |
573 |
|
|
final Phaser threadsStarted = new Phaser(1); // register this thread |
574 |
jsr166 |
1.27 |
final Runnable[] frobbers = { |
575 |
jsr166 |
1.32 |
() -> c.forEach(checkSanity), |
576 |
|
|
() -> c.stream().forEach(checkSanity), |
577 |
|
|
() -> c.parallelStream().forEach(checkSanity), |
578 |
jsr166 |
1.26 |
() -> c.spliterator().trySplit(), |
579 |
|
|
() -> { |
580 |
|
|
Spliterator s = c.spliterator(); |
581 |
jsr166 |
1.32 |
s.tryAdvance(checkSanity); |
582 |
jsr166 |
1.26 |
s.trySplit(); |
583 |
|
|
}, |
584 |
|
|
() -> { |
585 |
|
|
Spliterator s = c.spliterator(); |
586 |
jsr166 |
1.32 |
do {} while (s.tryAdvance(checkSanity)); |
587 |
jsr166 |
1.29 |
}, |
588 |
jsr166 |
1.32 |
() -> { for (Object x : c) checkSanity.accept(x); }, |
589 |
jsr166 |
1.36 |
() -> checkArraySanity.accept(c.toArray()), |
590 |
|
|
() -> checkArraySanity.accept(c.toArray(emptyArray)), |
591 |
jsr166 |
1.29 |
() -> { |
592 |
jsr166 |
1.26 |
assertTrue(c.add(one)); |
593 |
|
|
assertTrue(c.contains(one)); |
594 |
|
|
assertTrue(c.remove(one)); |
595 |
|
|
assertFalse(c.contains(one)); |
596 |
|
|
}, |
597 |
|
|
() -> { |
598 |
|
|
assertTrue(c.add(two)); |
599 |
|
|
assertTrue(c.contains(two)); |
600 |
|
|
assertTrue(c.remove(two)); |
601 |
|
|
assertFalse(c.contains(two)); |
602 |
jsr166 |
1.27 |
}, |
603 |
|
|
}; |
604 |
|
|
final List<Runnable> tasks = |
605 |
|
|
Arrays.stream(frobbers) |
606 |
jsr166 |
1.26 |
.filter(task -> rnd.nextBoolean()) // random subset |
607 |
|
|
.map(task -> (Runnable) () -> { |
608 |
|
|
threadsStarted.arriveAndAwaitAdvance(); |
609 |
|
|
while (!done.get()) |
610 |
|
|
task.run(); |
611 |
|
|
}) |
612 |
|
|
.collect(Collectors.toList()); |
613 |
jsr166 |
1.2 |
final ExecutorService pool = Executors.newCachedThreadPool(); |
614 |
|
|
try (PoolCleaner cleaner = cleaner(pool, done)) { |
615 |
jsr166 |
1.26 |
threadsStarted.bulkRegister(tasks.size()); |
616 |
|
|
futures = tasks.stream() |
617 |
jsr166 |
1.28 |
.map(pool::submit) |
618 |
jsr166 |
1.26 |
.collect(Collectors.toList()); |
619 |
|
|
threadsStarted.arriveAndDeregister(); |
620 |
jsr166 |
1.2 |
Thread.sleep(testDurationMillis); |
621 |
|
|
} |
622 |
jsr166 |
1.26 |
for (Future future : futures) |
623 |
|
|
assertNull(future.get(0L, MILLISECONDS)); |
624 |
jsr166 |
1.1 |
} |
625 |
|
|
|
626 |
jsr166 |
1.30 |
/** |
627 |
|
|
* Spliterators are either IMMUTABLE or truly late-binding or, if |
628 |
|
|
* concurrent, use the same "late-binding style" of returning |
629 |
|
|
* elements added between creation and first use. |
630 |
|
|
*/ |
631 |
|
|
public void testLateBindingStyle() { |
632 |
|
|
if (!testImplementationDetails) return; |
633 |
jsr166 |
1.31 |
if (impl.klazz() == ArrayList.class) return; // for jdk8 |
634 |
jsr166 |
1.30 |
// Immutable (snapshot) spliterators are exempt |
635 |
|
|
if (impl.emptyCollection().spliterator() |
636 |
|
|
.hasCharacteristics(Spliterator.IMMUTABLE)) |
637 |
|
|
return; |
638 |
|
|
final Object one = impl.makeElement(1); |
639 |
|
|
{ |
640 |
|
|
final Collection c = impl.emptyCollection(); |
641 |
|
|
final Spliterator split = c.spliterator(); |
642 |
|
|
c.add(one); |
643 |
|
|
assertTrue(split.tryAdvance(e -> { assertSame(e, one); })); |
644 |
|
|
assertFalse(split.tryAdvance(e -> { throw new AssertionError(); })); |
645 |
|
|
assertTrue(c.contains(one)); |
646 |
|
|
} |
647 |
|
|
{ |
648 |
|
|
final AtomicLong count = new AtomicLong(0); |
649 |
|
|
final Collection c = impl.emptyCollection(); |
650 |
|
|
final Spliterator split = c.spliterator(); |
651 |
|
|
c.add(one); |
652 |
|
|
split.forEachRemaining( |
653 |
|
|
e -> { assertSame(e, one); count.getAndIncrement(); }); |
654 |
|
|
assertEquals(1L, count.get()); |
655 |
|
|
assertFalse(split.tryAdvance(e -> { throw new AssertionError(); })); |
656 |
|
|
assertTrue(c.contains(one)); |
657 |
|
|
} |
658 |
|
|
} |
659 |
|
|
|
660 |
jsr166 |
1.4 |
// public void testCollection8DebugFail() { |
661 |
|
|
// fail(impl.klazz().getSimpleName()); |
662 |
|
|
// } |
663 |
jsr166 |
1.1 |
} |