1 /*
   2  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /* @test
  25  * @bug 4607272 6999915
  26  * @summary Unit test for AsynchronousSocketChannel
  27  * @run main/othervm -XX:+DisableExplicitGC -XX:MaxDirectMemorySize=64m Leaky
  28  */
  29 
  30 import java.nio.ByteBuffer;
  31 import java.nio.channels.*;
  32 import java.net.*;
  33 import java.util.List;
  34 import java.util.concurrent.Future;
  35 import java.util.concurrent.ThreadFactory;
  36 import java.lang.management.BufferPoolMXBean;
  37 import java.lang.management.ManagementFactory;
  38 
  39 /**
  40  * Heap buffers must be substituted with direct buffers when doing I/O. This
  41  * test creates a scenario on Windows that challenges the per-thread buffer
  42  * cache and quickly leads to an OutOfMemoryError if temporary buffers are
  43  * not returned to the native heap.
  44  */
  45 
  46 public class Leaky {
  47 
  48     static final int K = 1024;
  49 
  50     static class Connection {
  51         private final AsynchronousSocketChannel client;
  52         private final SocketChannel peer;
  53         private final ByteBuffer dst;
  54         private Future<Integer> readResult;
  55 
  56         Connection(AsynchronousChannelGroup group) throws Exception {
  57             ServerSocketChannel ssc =
  58                 ServerSocketChannel.open().bind(new InetSocketAddress(0));
  59             InetAddress lh = InetAddress.getLocalHost();
  60             int port = ((InetSocketAddress)(ssc.getLocalAddress())).getPort();
  61             SocketAddress remote = new InetSocketAddress(lh, port);
  62             client = AsynchronousSocketChannel.open(group);
  63             client.connect(remote).get();
  64             peer = ssc.accept();
  65             ssc.close();
  66             dst = ByteBuffer.allocate(K*K);
  67         }
  68 
  69         void startRead() {
  70             dst.clear();
  71             readResult = client.read(dst);
  72         }
  73 
  74         void write() throws Exception {
  75             peer.write(ByteBuffer.wrap("X".getBytes()));
  76         }
  77 
  78         void finishRead() throws Exception {
  79             readResult.get();
  80         }
  81     }
  82 
  83     public static void main(String[] args) throws Exception {
  84         ThreadFactory threadFactory = new ThreadFactory() {
  85             @Override
  86             public Thread newThread(Runnable r) {
  87                 Thread t = new Thread(r);
  88                 t.setDaemon(true);
  89                 return t;
  90             }
  91         };
  92         AsynchronousChannelGroup group =
  93             AsynchronousChannelGroup.withFixedThreadPool(4, threadFactory);
  94 
  95         final int CONNECTION_COUNT = 10;
  96         Connection[] connections = new Connection[CONNECTION_COUNT];
  97         for (int i=0; i<CONNECTION_COUNT; i++) {
  98             connections[i] = new Connection(group);
  99         }
 100 
 101         for (int i=0; i<1024; i++) {
 102             // initiate reads
 103             for (Connection conn: connections) {
 104                 conn.startRead();
 105             }
 106 
 107             // write data so that the read can complete
 108             for (Connection conn: connections) {
 109                 conn.write();
 110             }
 111 
 112             // complete read
 113             for (Connection conn: connections) {
 114                 conn.finishRead();
 115             }
 116         }
 117 
 118         // print summary of buffer pool usage
 119         List<BufferPoolMXBean> pools =
 120             ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
 121         for (BufferPoolMXBean pool: pools)
 122             System.out.format("         %8s             ", pool.getName());
 123         System.out.println();
 124         for (int i=0; i<pools.size(); i++)
 125             System.out.format("%6s %10s %10s  ",  "Count", "Capacity", "Memory");
 126         System.out.println();
 127         for (BufferPoolMXBean pool: pools) {
 128             System.out.format("%6d %10d %10d  ",
 129                 pool.getCount(), pool.getTotalCapacity(), pool.getMemoryUsed());
 130         }
 131         System.out.println();
 132     }
 133 }