Source for gnu.java.nio.ServerSocketChannelImpl

   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., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 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: }