135 lines
4.7 KiB
Java
135 lines
4.7 KiB
Java
/*
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* Copyright (c) 2008, 2012, 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 4607272 6999915 7185340
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* @summary Unit test for AsynchronousSocketChannel
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* @modules java.management
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* @run main/othervm -XX:+DisableExplicitGC -XX:MaxDirectMemorySize=75m Leaky
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*/
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import java.nio.ByteBuffer;
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import java.nio.channels.*;
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import java.net.*;
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import java.util.List;
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import java.util.concurrent.Future;
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import java.util.concurrent.ThreadFactory;
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import java.lang.management.BufferPoolMXBean;
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import java.lang.management.ManagementFactory;
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/**
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* Heap buffers must be substituted with direct buffers when doing I/O. This
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* test creates a scenario on Windows that challenges the per-thread buffer
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* cache and quickly leads to an OutOfMemoryError if temporary buffers are
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* not returned to the native heap.
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*/
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public class Leaky {
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static final int K = 1024;
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static class Connection {
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private final AsynchronousSocketChannel client;
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private final SocketChannel peer;
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private final ByteBuffer dst;
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private Future<Integer> readResult;
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Connection(AsynchronousChannelGroup group) throws Exception {
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ServerSocketChannel ssc =
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ServerSocketChannel.open().bind(new InetSocketAddress(0));
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InetAddress lh = InetAddress.getLocalHost();
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int port = ((InetSocketAddress)(ssc.getLocalAddress())).getPort();
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SocketAddress remote = new InetSocketAddress(lh, port);
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client = AsynchronousSocketChannel.open(group);
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client.connect(remote).get();
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peer = ssc.accept();
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ssc.close();
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dst = ByteBuffer.allocate(K*K);
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}
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void startRead() {
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dst.clear();
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readResult = client.read(dst);
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}
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void write() throws Exception {
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peer.write(ByteBuffer.wrap("X".getBytes()));
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}
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void finishRead() throws Exception {
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readResult.get();
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}
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}
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public static void main(String[] args) throws Exception {
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ThreadFactory threadFactory = new ThreadFactory() {
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@Override
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public Thread newThread(Runnable r) {
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Thread t = new Thread(r);
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t.setDaemon(true);
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return t;
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}
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};
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AsynchronousChannelGroup group =
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AsynchronousChannelGroup.withFixedThreadPool(4, threadFactory);
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final int CONNECTION_COUNT = 10;
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Connection[] connections = new Connection[CONNECTION_COUNT];
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for (int i=0; i<CONNECTION_COUNT; i++) {
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connections[i] = new Connection(group);
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}
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for (int i=0; i<1024; i++) {
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// initiate reads
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for (Connection conn: connections) {
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conn.startRead();
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}
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// write data so that the read can complete
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for (Connection conn: connections) {
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conn.write();
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}
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// complete read
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for (Connection conn: connections) {
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conn.finishRead();
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}
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}
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// print summary of buffer pool usage
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List<BufferPoolMXBean> pools =
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ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
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for (BufferPoolMXBean pool: pools)
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System.out.format(" %8s ", pool.getName());
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System.out.println();
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for (int i=0; i<pools.size(); i++)
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System.out.format("%6s %10s %10s ", "Count", "Capacity", "Memory");
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System.out.println();
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for (BufferPoolMXBean pool: pools) {
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System.out.format("%6d %10d %10d ",
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pool.getCount(), pool.getTotalCapacity(), pool.getMemoryUsed());
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}
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System.out.println();
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}
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}
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