6ec2cfcc49
Add internal TerminatingThreadLocal and use it to free cached thread-local direct buffers and nio-fs native buffers Reviewed-by: tonyp, alanb
92 lines
3.4 KiB
Java
92 lines
3.4 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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import java.io.IOException;
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import java.io.UncheckedIOException;
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import java.lang.management.BufferPoolMXBean;
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import java.lang.management.ManagementFactory;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import static java.nio.file.StandardOpenOption.CREATE;
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import static java.nio.file.StandardOpenOption.TRUNCATE_EXISTING;
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import static java.nio.file.StandardOpenOption.WRITE;
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/*
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* @test
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* @bug 8202788
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* @summary Test reclamation of thread-local temporary direct byte buffers at thread exit
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* @modules java.management
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* @run main/othervm TempDirectBuffersReclamation
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*/
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public class TempDirectBuffersReclamation {
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public static void main(String[] args) throws IOException {
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BufferPoolMXBean dbPool = ManagementFactory
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.getPlatformMXBeans(BufferPoolMXBean.class)
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.stream()
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.filter(bp -> bp.getName().equals("direct"))
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.findFirst()
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.orElseThrow(() -> new RuntimeException("Can't obtain direct BufferPoolMXBean"));
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long count0 = dbPool.getCount();
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long memoryUsed0 = dbPool.getMemoryUsed();
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Thread thread = new Thread(TempDirectBuffersReclamation::doFileChannelWrite);
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thread.start();
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try {
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thread.join();
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} catch (InterruptedException e) {
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throw new RuntimeException(e);
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}
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long count1 = dbPool.getCount();
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long memoryUsed1 = dbPool.getMemoryUsed();
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if (count0 != count1 || memoryUsed0 != memoryUsed1) {
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throw new AssertionError(
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"Direct BufferPool not same before thread activity and after thread exit.\n" +
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"Before: # of buffers: " + count0 + ", memory used: " + memoryUsed0 + "\n" +
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" After: # of buffers: " + count1 + ", memory used: " + memoryUsed1 + "\n"
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);
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}
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}
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static void doFileChannelWrite() {
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try {
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Path file = Files.createTempFile("test", ".tmp");
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try (FileChannel fc = FileChannel.open(file, CREATE, WRITE, TRUNCATE_EXISTING)) {
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fc.write(ByteBuffer.wrap("HELLO".getBytes(StandardCharsets.UTF_8)));
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} finally {
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Files.delete(file);
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}
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} catch (IOException e) {
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throw new UncheckedIOException(e);
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}
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}
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}
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