Source for gnu.java.nio.EpollSelectionKeyImpl

   1: /* EpollSelectionKeyImpl.java -- selection key for the epoll selector.
   2:    Copyright (C) 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 java.io.IOException;
  42: import java.nio.channels.CancelledKeyException;
  43: import java.nio.channels.SelectableChannel;
  44: import java.nio.channels.SelectionKey;
  45: import java.nio.channels.Selector;
  46: import java.nio.channels.spi.AbstractSelectionKey;
  47: 
  48: /**
  49:  * @author Casey Marshall (csm@gnu.org)
  50:  */
  51: public class EpollSelectionKeyImpl extends AbstractSelectionKey
  52: {
  53:   final int fd;
  54:   private final EpollSelectorImpl selector;
  55:   private final SelectableChannel channel;
  56:   int interestOps;
  57:   int selectedOps;
  58:   int key;
  59:   boolean valid;
  60:   boolean cancelled;
  61: 
  62:   EpollSelectionKeyImpl(EpollSelectorImpl selector,
  63:                         SelectableChannel channel, int fd)
  64:   {
  65:     this.selector = selector;
  66:     this.channel = channel;
  67:     this.fd = fd;
  68:   }
  69: 
  70:   /* (non-Javadoc)
  71:    * @see java.nio.channels.SelectionKey#channel()
  72:    */
  73:   public SelectableChannel channel()
  74:   {
  75:     return channel;
  76:   }
  77: 
  78:   /* (non-Javadoc)
  79:    * @see java.nio.channels.SelectionKey#interestOps()
  80:    */
  81:   public int interestOps()
  82:   {
  83:     return interestOps;
  84:   }
  85: 
  86:   /* (non-Javadoc)
  87:    * @see java.nio.channels.SelectionKey#interestOps(int)
  88:    */
  89:   public SelectionKey interestOps(int ops)
  90:   {
  91:     if (cancelled)
  92:       throw new CancelledKeyException();
  93:     if ((ops & ~(channel.validOps())) != 0)
  94:       throw new IllegalArgumentException("unsupported channel ops");
  95:     try
  96:       {
  97:         selector.epoll_modify(this, ops);
  98:         interestOps = ops;
  99:       }
 100:     catch (IOException ioe)
 101:       {
 102:         throw new IllegalArgumentException(ioe);
 103:       }
 104:     return this;
 105:   }
 106: 
 107:   /* (non-Javadoc)
 108:    * @see java.nio.channels.SelectionKey#readyOps()
 109:    */
 110:   public int readyOps()
 111:   {
 112:     return selectedOps;
 113:   }
 114: 
 115:   /* (non-Javadoc)
 116:    * @see java.nio.channels.SelectionKey#selector()
 117:    */
 118:   public Selector selector()
 119:   {
 120:     return selector;
 121:   }
 122: }