88 lines
3.3 KiB
Java
88 lines
3.3 KiB
Java
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/*
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* Copyright (c) 2017, 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 8147615
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* @summary Test whether an unreferenced FileChannel is actually cleaned
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* @requires (os.family == "linux") | (os.family == "mac") | (os.family == "solaris") | (os.family == "aix")
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* @modules java.management
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* @run main/othervm CleanerTest
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*/
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import com.sun.management.UnixOperatingSystemMXBean;
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import java.lang.management.ManagementFactory;
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import java.lang.management.OperatingSystemMXBean;
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import java.lang.ref.PhantomReference;
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import java.lang.ref.Reference;
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import java.lang.ref.ReferenceQueue;
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import java.nio.channels.FileChannel;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.nio.file.StandardOpenOption;
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public class CleanerTest {
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public static void main(String[] args) throws Throwable {
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OperatingSystemMXBean mxBean =
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ManagementFactory.getOperatingSystemMXBean();
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UnixOperatingSystemMXBean unixMxBean = null;
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if (mxBean instanceof UnixOperatingSystemMXBean) {
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unixMxBean = (UnixOperatingSystemMXBean)mxBean;
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} else {
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System.out.println("Non-Unix system: skipping test.");
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return;
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}
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Path path = Paths.get(System.getProperty("test.dir", "."), "junk");
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try {
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FileChannel fc = FileChannel.open(path, StandardOpenOption.CREATE,
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StandardOpenOption.READ, StandardOpenOption.WRITE);
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ReferenceQueue refQueue = new ReferenceQueue();
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Reference fcRef = new PhantomReference(fc, refQueue);
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long fdCount0 = unixMxBean.getOpenFileDescriptorCount();
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fc = null;
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// Perform repeated GCs until the reference has been enqueued.
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do {
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Thread.sleep(1);
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System.gc();
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} while (refQueue.poll() == null);
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// Loop until the open file descriptor count has been decremented.
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while (unixMxBean.getOpenFileDescriptorCount() > fdCount0 - 1) {
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Thread.sleep(1);
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}
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long fdCount = unixMxBean.getOpenFileDescriptorCount();
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if (fdCount != fdCount0 - 1) {
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throw new RuntimeException("FD count expected " +
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(fdCount0 - 1) + "; actual " + fdCount);
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}
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} finally {
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Files.delete(path);
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}
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}
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}
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