112 lines
3.7 KiB
Java
112 lines
3.7 KiB
Java
/*
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* Copyright (c) 2018, 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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/* @test
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* @bug 8208362
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* @summary Tests reachability from source to dependent direct byte buffers
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* @run testng ReachabilityTest
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*/
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import org.testng.Assert;
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import org.testng.annotations.Test;
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import java.lang.ref.Reference;
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import java.lang.ref.ReferenceQueue;
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import java.lang.ref.WeakReference;
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import java.nio.Buffer;
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import java.nio.ByteBuffer;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Objects;
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import java.util.concurrent.CountDownLatch;
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import java.util.function.UnaryOperator;
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import static java.util.concurrent.TimeUnit.MILLISECONDS;
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public class ReachabilityTest {
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@Test
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public void testDuplicate() {
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testReachability(ByteBuffer.allocateDirect(16384),
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ByteBuffer::duplicate);
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}
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@Test
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public void testSlice() {
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testReachability(ByteBuffer.allocateDirect(16384),
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ByteBuffer::slice);
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}
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@Test
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public void testViewDuplicate() {
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testReachability(ByteBuffer.allocateDirect(16384),
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(Buffer b) -> b instanceof ByteBuffer
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? ((ByteBuffer) b).asIntBuffer()
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: b.duplicate()
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);
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}
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@Test
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public void testViewSlice() {
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testReachability(ByteBuffer.allocateDirect(16384),
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(Buffer b) -> b instanceof ByteBuffer
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? ((ByteBuffer) b).asIntBuffer()
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: b.slice()
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);
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}
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<T> void testReachability(T t, UnaryOperator<T> b) {
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WeakReference<T> root = new WeakReference<>(t);
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ReferenceQueue<Object> queue = new ReferenceQueue<>();
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List<WeakReference<T>> refs = new ArrayList<>();
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for (int i = 0; i < 1000; i++) {
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t = b.apply(t);
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refs.add(new WeakReference<>(t, queue));
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}
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t = b.apply(t);
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boolean collected = false;
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long timeoutMillis = 100L;
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try {
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for (int tries = 0; tries < 3 && !collected; tries++) {
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System.gc();
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collected = refs.stream().map(Reference::get).anyMatch(Objects::isNull);
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if (!collected) {
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collected = queue.remove(timeoutMillis) != null;
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timeoutMillis *= 4;
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}
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}
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} catch (InterruptedException unexpected) {
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throw new AssertionError("unexpected InterruptedException");
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}
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// Some or all of the intermediate values must be GC'ed
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Assert.assertTrue(collected);
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// The root should never be GC'ed
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Assert.assertNotNull(root.get());
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Reference.reachabilityFence(t);
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}
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}
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