117 lines
4.0 KiB
Java
117 lines
4.0 KiB
Java
/*
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* Copyright (c) 2011, 2020, 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 4268317 8132306 8175797
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* @summary Test if Reference.enqueue() works properly with GC
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* @run main ReferenceEnqueue
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*/
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import java.lang.ref.*;
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import java.util.ArrayList;
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import java.util.List;
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public class ReferenceEnqueue {
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public static void main(String args[]) throws Exception {
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for (int i=0; i < 5; i++) {
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new WeakRef().run();
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new ExplicitEnqueue().run();
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}
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System.out.println("Test passed.");
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}
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static class WeakRef {
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final ReferenceQueue<Object> queue = new ReferenceQueue<Object>();
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final Reference<Object> ref;
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final int iterations = 1000;
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WeakRef() {
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this.ref = new WeakReference<Object>(new Object(), queue);
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}
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void run() throws InterruptedException {
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boolean enqueued = false;
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System.gc();
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for (int i = 0; i < iterations; i++) {
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System.gc();
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enqueued = (queue.remove(100) == ref);
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if (enqueued) break;
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}
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if (!enqueued) {
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// GC have not enqueued refWeak for the timeout period
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throw new RuntimeException("Error: reference not enqueued");
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}
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if (ref.enqueue() == true) {
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// enqueue() should return false since
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// ref is already enqueued by the GC
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throw new RuntimeException("Error: enqueue() returned true;"
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+ " expected false");
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}
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}
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}
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static class ExplicitEnqueue {
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final ReferenceQueue<Object> queue = new ReferenceQueue<>();
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final List<Reference<Object>> refs = new ArrayList<>();
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final int iterations = 1000;
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ExplicitEnqueue() {
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this.refs.add(new SoftReference<>(new Object(), queue));
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this.refs.add(new WeakReference<>(new Object(), queue));
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this.refs.add(new PhantomReference<>(new Object(), queue));
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}
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void run() throws InterruptedException {
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for (Reference<Object> ref : refs) {
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if (ref.enqueue() == false) {
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throw new RuntimeException("Error: enqueue failed");
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}
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if (!ref.refersTo(null)) {
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throw new RuntimeException("Error: referent must be cleared");
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}
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}
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System.gc();
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for (int i = 0; refs.size() > 0 && i < iterations; i++) {
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Reference<Object> ref = (Reference<Object>)queue.poll();
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if (ref == null) {
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System.gc();
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Thread.sleep(100);
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continue;
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}
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if (refs.remove(ref) == false) {
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throw new RuntimeException("Error: unknown reference " + ref);
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}
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}
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if (!refs.isEmpty()) {
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throw new RuntimeException("Error: not all references are removed");
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}
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}
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}
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}
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