libjava/gnu/java/nio/SocketChannelImpl.java

   1 /* SocketChannelImpl.java --
   2    Copyright (C) 2002, 2003, 2004, 2006 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 gnu.java.net.PlainSocketImpl;
  42
  43 import java.io.IOException;
  44 import java.io.InputStream;
  45 import java.io.OutputStream;
  46 import java.net.InetSocketAddress;
  47 import java.net.Socket;
  48 import java.net.SocketAddress;
  49 import java.net.SocketTimeoutException;
  50 import java.nio.ByteBuffer;
  51 import java.nio.channels.AlreadyConnectedException;
  52 import java.nio.channels.ClosedChannelException;
  53 import java.nio.channels.ConnectionPendingException;
  54 import java.nio.channels.NoConnectionPendingException;
  55 import java.nio.channels.NotYetConnectedException;
  56 import java.nio.channels.SelectionKey;
  57 import java.nio.channels.Selector;
  58 import java.nio.channels.SocketChannel;
  59 import java.nio.channels.UnresolvedAddressException;
  60 import java.nio.channels.UnsupportedAddressTypeException;
  61 import java.nio.channels.spi.SelectorProvider;
  62
  63 public final class SocketChannelImpl extends SocketChannel
  64 {
  65   private PlainSocketImpl impl;
  66   private NIOSocket socket;
  67   private boolean connectionPending;
  68
  69   SocketChannelImpl (SelectorProvider provider)
  70     throws IOException
  71   {
  72     super (provider);
  73     impl = new PlainSocketImpl();
  74     socket = new NIOSocket (impl, this);
  75     configureBlocking(true);
  76   }
  77
  78   SocketChannelImpl (SelectorProvider provider,
  79                      NIOSocket socket)
  80     throws IOException
  81   {
  82     super (provider);
  83     this.impl = socket.getPlainSocketImpl();
  84     this.socket = socket;
  85   }
  86
  87   public void finalizer()
  88   {
  89     if (isConnected())
  90       {
  91         try
  92           {
  93             close ();
  94           }
  95         catch (Exception e)
  96           {
  97           }
  98       }
  99   }
 100
 101   PlainSocketImpl getPlainSocketImpl()
 102   {
 103     return impl;
 104   }
 105
 106   int getNativeFD()
 107   {
 108     return socket.getPlainSocketImpl().getNativeFD();
 109   }
 110
 111   protected void implCloseSelectableChannel () throws IOException
 112   {
 113     socket.close();
 114   }
 115
 116   protected void implConfigureBlocking (boolean blocking) throws IOException
 117   {
 118     socket.setSoTimeout (blocking ? 0 : NIOConstants.DEFAULT_TIMEOUT);
 119   }
 120
 121   public boolean connect (SocketAddress remote) throws IOException
 122   {
 123     if (!isOpen())
 124       throw new ClosedChannelException();
 125
 126     if (isConnected())
 127       throw new AlreadyConnectedException();
 128
 129     if (connectionPending)
 130       throw new ConnectionPendingException();
 131
 132     if (!(remote instanceof InetSocketAddress))
 133       throw new UnsupportedAddressTypeException();
 134
 135     if (((InetSocketAddress) remote).isUnresolved())
 136       throw new UnresolvedAddressException();
 137
 138     try
 139       {
 140         socket.getPlainSocketImpl().setInChannelOperation(true);
 141           // indicate that a channel is initiating the accept operation
 142           // so that the socket ignores the fact that we might be in
 143           // non-blocking mode.
 144
 145         if (isBlocking())
 146           {
 147             // Do blocking connect.
 148             socket.connect (remote);
 149             return true;
 150           }
 151
 152         // Do non-blocking connect.
 153         try
 154           {
 155             socket.connect (remote, NIOConstants.DEFAULT_TIMEOUT);
 156             return true;
 157           }
 158         catch (SocketTimeoutException e)
 159           {
 160             connectionPending = true;
 161             return false;
 162           }
 163       }
 164     finally
 165       {
 166         socket.getPlainSocketImpl().setInChannelOperation(false);
 167       }
 168   }
 169
 170   public boolean finishConnect ()
 171     throws IOException
 172   {
 173     if (!isOpen())
 174       throw new ClosedChannelException();
 175
 176     if (!isConnected() && !connectionPending)
 177       throw new NoConnectionPendingException();
 178
 179     if (isConnected())
 180       return true;
 181
 182     // FIXME: Handle blocking/non-blocking mode.
 183
 184     Selector selector = provider().openSelector();
 185     register(selector, SelectionKey.OP_CONNECT);
 186
 187     if (isBlocking())
 188       {
 189         selector.select(); // blocking until channel is connected.
 190         connectionPending = false;
 191         return true;
 192       }
 193
 194     int ready = selector.selectNow(); // non-blocking
 195     if (ready == 1)
 196       {
 197         connectionPending = false;
 198         return true;
 199       }
 200
 201     return false;
 202   }
 203
 204   public boolean isConnected ()
 205   {
 206     return socket.isConnected();
 207   }
 208
 209   public boolean isConnectionPending ()
 210   {
 211     return connectionPending;
 212   }
 213
 214   public Socket socket ()
 215   {
 216     return socket;
 217   }
 218
 219   public int read(ByteBuffer dst) throws IOException
 220   {
 221     if (!isConnected())
 222       throw new NotYetConnectedException();
 223
 224     byte[] data;
 225     int offset = 0;
 226     InputStream input = socket.getInputStream();
 227     int available = input.available();
 228     int len = dst.remaining();
 229
 230     if ((! isBlocking()) && available == 0)
 231       return 0;
 232
 233     if (dst.hasArray())
 234       {
 235         offset = dst.arrayOffset() + dst.position();
 236         data = dst.array();
 237       }
 238     else
 239       {
 240         data = new byte [len];
 241       }
 242
 243     int readBytes = 0;
 244     boolean completed = false;
 245
 246     try
 247       {
 248         begin();
 249         socket.getPlainSocketImpl().setInChannelOperation(true);
 250         readBytes = input.read (data, offset, len);
 251         completed = true;
 252       }
 253     finally
 254       {
 255         end (completed);
 256         socket.getPlainSocketImpl().setInChannelOperation(false);
 257       }
 258
 259     if (readBytes > 0)
 260       if (dst.hasArray())
 261         {
 262           dst.position (dst.position() + readBytes);
 263         }
 264       else
 265         {
 266           dst.put (data, offset, readBytes);
 267         }
 268
 269     return readBytes;
 270   }
 271
 272   public long read (ByteBuffer[] dsts, int offset, int length)
 273     throws IOException
 274   {
 275     if (!isConnected())
 276       throw new NotYetConnectedException();
 277
 278     if ((offset < 0)
 279         || (offset > dsts.length)
 280         || (length < 0)
 281         || (length > (dsts.length - offset)))
 282       throw new IndexOutOfBoundsException();
 283
 284     long readBytes = 0;
 285
 286     for (int index = offset; index < length; index++)
 287       readBytes += read (dsts [index]);
 288
 289     return readBytes;
 290   }
 291
 292   public int write (ByteBuffer src)
 293     throws IOException
 294   {
 295     if (!isConnected())
 296       throw new NotYetConnectedException();
 297
 298     byte[] data;
 299     int offset = 0;
 300     int len = src.remaining();
 301
 302     if (!src.hasArray())
 303       {
 304         data = new byte [len];
 305         src.get (data, 0, len);
 306       }
 307     else
 308       {
 309         offset = src.arrayOffset() + src.position();
 310         data = src.array();
 311       }
 312
 313     OutputStream output = socket.getOutputStream();
 314     boolean completed = false;
 315
 316     try
 317       {
 318         begin();
 319         socket.getPlainSocketImpl().setInChannelOperation(true);
 320         output.write (data, offset, len);
 321         completed = true;
 322       }
 323     finally
 324       {
 325         end (completed);
 326         socket.getPlainSocketImpl().setInChannelOperation(false);
 327       }
 328
 329     if (src.hasArray())
 330       {
 331         src.position (src.position() + len);
 332       }
 333
 334     return len;
 335   }
 336
 337   public long write (ByteBuffer[] srcs, int offset, int length)
 338     throws IOException
 339   {
 340     if (!isConnected())
 341       throw new NotYetConnectedException();
 342
 343     if ((offset < 0)
 344         || (offset > srcs.length)
 345         || (length < 0)
 346         || (length > (srcs.length - offset)))
 347       throw new IndexOutOfBoundsException();
 348
 349     long writtenBytes = 0;
 350
 351     for (int index = offset; index < length; index++)
 352       writtenBytes += write (srcs [index]);
 353
 354     return writtenBytes;
 355   }
 356 }