115 lines
4.2 KiB
Java
115 lines
4.2 KiB
Java
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @run testng SpliteratorTraverseAddRemoveTest
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* @bug 8085978
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* @summary repeatedly traverse the queue using the spliterator while
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* concurrently adding and removing an element to test that self-linked
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* nodes are never erroneously reported on traversal
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*/
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import org.testng.Assert;
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import org.testng.annotations.DataProvider;
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import org.testng.annotations.Test;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Queue;
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import java.util.Spliterator;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.LinkedTransferQueue;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.function.Consumer;
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@Test
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public class SpliteratorTraverseAddRemoveTest {
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static Object[] of(String desc, Consumer<Queue<?>> c) {
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return new Object[]{desc, c};
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}
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static void assertIsString(Object e) {
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Assert.assertTrue(e instanceof String,
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String.format("Object instanceof %s (actual: instanceof %s)",
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String.class.getName(),
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e.getClass().getName()));
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}
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@DataProvider()
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public static Object[][] spliteratorTraversers() {
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return new Object[][]{
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of("forEachRemaining", q -> {
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q.spliterator().forEachRemaining(SpliteratorTraverseAddRemoveTest::assertIsString);
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}),
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of("tryAdvance", q -> {
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Spliterator<?> s = q.spliterator();
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while (s.tryAdvance(SpliteratorTraverseAddRemoveTest::assertIsString))
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;
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}),
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of("trySplit then forEachRemaining", q -> {
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Spliterator<?> r = q.spliterator();
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List<Spliterator<?>> ss = new ArrayList<>();
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Spliterator<?> l;
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while ((l = r.trySplit()) != null) {
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ss.add(l);
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}
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ss.add(r);
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ss.forEach(s -> s.forEachRemaining(SpliteratorTraverseAddRemoveTest::assertIsString));
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}),
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};
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}
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@Test(dataProvider = "spliteratorTraversers")
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public void testQueue(String desc, Consumer<Queue<String>> c)
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throws InterruptedException {
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AtomicBoolean done = new AtomicBoolean(false);
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Queue<String> msgs = new LinkedTransferQueue<>();
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CompletableFuture<Void> traversalTask = CompletableFuture.runAsync(() -> {
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while (!done.get()) {
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// Traversal will fail if self-linked nodes of
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// LinkedTransferQueue are erroneously reported
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c.accept(msgs);
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}
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});
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CompletableFuture<Void> addAndRemoveTask = CompletableFuture.runAsync(() -> {
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while (!traversalTask.isDone()) {
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msgs.add("msg");
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msgs.remove("msg");
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}
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});
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Thread.sleep(TimeUnit.SECONDS.toMillis(1));
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done.set(true);
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addAndRemoveTask.join();
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Assert.assertTrue(traversalTask.isDone());
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traversalTask.join();
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}
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}
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