libjava/gnu/java/nio/ServerSocketChannelImpl.java

   1 /* ServerSocketChannelImpl.java --
   2    Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.java.nio;
  40
  41 import java.io.IOException;
  42 import java.net.ServerSocket;
  43 import java.net.SocketTimeoutException;
  44 import java.nio.channels.ClosedChannelException;
  45 import java.nio.channels.NotYetBoundException;
  46 import java.nio.channels.ServerSocketChannel;
  47 import java.nio.channels.SocketChannel;
  48 import java.nio.channels.spi.SelectorProvider;
  49
  50 public final class ServerSocketChannelImpl extends ServerSocketChannel
  51 {
  52   private NIOServerSocket serverSocket;
  53   private boolean connected;
  54
  55   protected ServerSocketChannelImpl (SelectorProvider provider)
  56     throws IOException
  57   {
  58     super (provider);
  59     serverSocket = new NIOServerSocket (this);
  60     configureBlocking(true);
  61   }
  62
  63   public int getNativeFD()
  64   {
  65     return serverSocket.getPlainSocketImpl().getNativeFD();
  66   }
  67
  68   public void finalizer()
  69   {
  70     if (connected)
  71       {
  72         try
  73           {
  74             close ();
  75           }
  76         catch (Exception e)
  77           {
  78           }
  79       }
  80   }
  81
  82   protected void implCloseSelectableChannel () throws IOException
  83   {
  84     connected = false;
  85     serverSocket.close();
  86   }
  87
  88   protected void implConfigureBlocking (boolean blocking) throws IOException
  89   {
  90     serverSocket.setSoTimeout (blocking ? 0 : NIOConstants.DEFAULT_TIMEOUT);
  91   }
  92
  93   public SocketChannel accept () throws IOException
  94   {
  95     if (!isOpen())
  96       throw new ClosedChannelException();
  97
  98     if (!serverSocket.isBound())
  99       throw new NotYetBoundException();
 100
 101     boolean completed = false;
 102
 103     try
 104       {
 105         begin();
 106         serverSocket.getPlainSocketImpl().setInChannelOperation(true);
 107           // indicate that a channel is initiating the accept operation
 108           // so that the socket ignores the fact that we might be in
 109           // non-blocking mode.
 110         NIOSocket socket = (NIOSocket) serverSocket.accept();
 111         completed = true;
 112         return socket.getChannel();
 113       }
 114     catch (SocketTimeoutException e)
 115       {
 116         return null;
 117       }
 118     finally
 119       {
 120         serverSocket.getPlainSocketImpl().setInChannelOperation(false);
 121         end (completed);
 122       }
 123   }
 124
 125   public ServerSocket socket ()
 126   {
 127     return serverSocket;
 128   }
 129 }