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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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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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import java.util.ArrayList; |
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import java.util.Collection; |
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import java.util.Collections; |
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import java.util.concurrent.Executors; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.Future; |
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import java.util.concurrent.atomic.AtomicBoolean; |
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import java.util.concurrent.atomic.AtomicLong; |
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import java.util.function.Consumer; |
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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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/** |
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* stream().forEach returns elements in the collection |
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*/ |
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public void testForEach() throws Throwable { |
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final Collection c = impl.emptyCollection(); |
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final AtomicLong count = new AtomicLong(0L); |
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final Object x = impl.makeElement(1); |
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final Object y = impl.makeElement(2); |
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final ArrayList found = new ArrayList(); |
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Consumer<Object> spy = (o) -> { found.add(o); }; |
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c.stream().forEach(spy); |
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assertTrue(found.isEmpty()); |
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assertTrue(c.add(x)); |
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c.stream().forEach(spy); |
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assertEquals(Collections.singletonList(x), found); |
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found.clear(); |
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assertTrue(c.add(y)); |
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c.stream().forEach(spy); |
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assertEquals(2, found.size()); |
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assertTrue(found.contains(x)); |
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assertTrue(found.contains(y)); |
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found.clear(); |
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c.clear(); |
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c.stream().forEach(spy); |
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assertTrue(found.isEmpty()); |
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} |
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public void testForEachConcurrentStressTest() throws Throwable { |
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if (!impl.isConcurrent()) return; |
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final Collection c = impl.emptyCollection(); |
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final long testDurationMillis = SHORT_DELAY_MS; |
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final AtomicBoolean done = new AtomicBoolean(false); |
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final Object elt = impl.makeElement(1); |
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ExecutorService pool = Executors.newCachedThreadPool(); |
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Runnable checkElt = () -> { |
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while (!done.get()) |
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c.stream().forEach((x) -> { assertSame(x, elt); }); }; |
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Runnable addRemove = () -> { |
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while (!done.get()) { |
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assertTrue(c.add(elt)); |
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assertTrue(c.remove(elt)); |
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}}; |
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Future<?> f1 = pool.submit(checkElt); |
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Future<?> f2 = pool.submit(addRemove); |
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Thread.sleep(testDurationMillis); |
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done.set(true); |
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pool.shutdown(); |
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assertTrue(pool.awaitTermination(LONG_DELAY_MS, MILLISECONDS)); |
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assertNull(f1.get(LONG_DELAY_MS, MILLISECONDS)); |
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assertNull(f2.get(LONG_DELAY_MS, MILLISECONDS)); |
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} |
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// public void testCollection8DebugFail() { fail(); } |
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} |
