| /* |
| * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* @test |
| * @bug 4607272 6999915 7185340 |
| * @summary Unit test for AsynchronousSocketChannel |
| * @run main/othervm -XX:+DisableExplicitGC -XX:MaxDirectMemorySize=75m Leaky |
| */ |
| |
| import java.nio.ByteBuffer; |
| import java.nio.channels.*; |
| import java.net.*; |
| import java.util.List; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.ThreadFactory; |
| import java.lang.management.BufferPoolMXBean; |
| import java.lang.management.ManagementFactory; |
| |
| /** |
| * Heap buffers must be substituted with direct buffers when doing I/O. This |
| * test creates a scenario on Windows that challenges the per-thread buffer |
| * cache and quickly leads to an OutOfMemoryError if temporary buffers are |
| * not returned to the native heap. |
| */ |
| |
| public class Leaky { |
| |
| static final int K = 1024; |
| |
| static class Connection { |
| private final AsynchronousSocketChannel client; |
| private final SocketChannel peer; |
| private final ByteBuffer dst; |
| private Future<Integer> readResult; |
| |
| Connection(AsynchronousChannelGroup group) throws Exception { |
| ServerSocketChannel ssc = |
| ServerSocketChannel.open().bind(new InetSocketAddress(0)); |
| InetAddress lh = InetAddress.getLocalHost(); |
| int port = ((InetSocketAddress)(ssc.getLocalAddress())).getPort(); |
| SocketAddress remote = new InetSocketAddress(lh, port); |
| client = AsynchronousSocketChannel.open(group); |
| client.connect(remote).get(); |
| peer = ssc.accept(); |
| ssc.close(); |
| dst = ByteBuffer.allocate(K*K); |
| } |
| |
| void startRead() { |
| dst.clear(); |
| readResult = client.read(dst); |
| } |
| |
| void write() throws Exception { |
| peer.write(ByteBuffer.wrap("X".getBytes())); |
| } |
| |
| void finishRead() throws Exception { |
| readResult.get(); |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| ThreadFactory threadFactory = new ThreadFactory() { |
| @Override |
| public Thread newThread(Runnable r) { |
| Thread t = new Thread(r); |
| t.setDaemon(true); |
| return t; |
| } |
| }; |
| AsynchronousChannelGroup group = |
| AsynchronousChannelGroup.withFixedThreadPool(4, threadFactory); |
| |
| final int CONNECTION_COUNT = 10; |
| Connection[] connections = new Connection[CONNECTION_COUNT]; |
| for (int i=0; i<CONNECTION_COUNT; i++) { |
| connections[i] = new Connection(group); |
| } |
| |
| for (int i=0; i<1024; i++) { |
| // initiate reads |
| for (Connection conn: connections) { |
| conn.startRead(); |
| } |
| |
| // write data so that the read can complete |
| for (Connection conn: connections) { |
| conn.write(); |
| } |
| |
| // complete read |
| for (Connection conn: connections) { |
| conn.finishRead(); |
| } |
| } |
| |
| // print summary of buffer pool usage |
| List<BufferPoolMXBean> pools = |
| ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class); |
| for (BufferPoolMXBean pool: pools) |
| System.out.format(" %8s ", pool.getName()); |
| System.out.println(); |
| for (int i=0; i<pools.size(); i++) |
| System.out.format("%6s %10s %10s ", "Count", "Capacity", "Memory"); |
| System.out.println(); |
| for (BufferPoolMXBean pool: pools) { |
| System.out.format("%6d %10d %10d ", |
| pool.getCount(), pool.getTotalCapacity(), pool.getMemoryUsed()); |
| } |
| System.out.println(); |
| } |
| } |