code: /***************************************************************************
   *   Copyright (C) by Fabrizio Montesi                                     *
   *                                                                         *
   *   This program is free software; you can redistribute it and/or modify  *
   *   it under the terms of the GNU Library General Public License as       *
   *   published by the Free Software Foundation; either version 2 of the    *
   *   License, or (at your option) any later version.                       *
   *                                                                         *
   *   This program is distributed in the hope that it will be useful,       *
   *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
   *   GNU General Public License for more details.                          *
   *                                                                         *
   *   You should have received a copy of the GNU Library General Public     *
   *   License along with this program; if not, write to the                 *
   *   Free Software Foundation, Inc.,                                       *
   *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
   *                                                                         *
   *   For details about the authors of this software, see the AUTHORS file. *
   ***************************************************************************/
  
  package jolie.net;
  
  import cx.ath.matthew.unix.UnixSocket;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.net.URI;
  import jolie.Interpreter;
  import jolie.net.protocols.CommProtocol;
  
  public class LocalSocketCommChannel extends StreamingCommChannel implements PollableCommChannel
  {
  	private final UnixSocket socket;
  	private final PreBufferedInputStream bufferedInputStream;
  	private final InputStream socketInputStream;
  	private final OutputStream socketOutputStream;
  	
  	public LocalSocketCommChannel( UnixSocket socket, URI location, CommProtocol protocol )
  		throws IOException
  	{
  		super( location, protocol );
  		
  		this.socket = socket;
  		this.socketInputStream = socket.getInputStream();
  		this.socketOutputStream = socket.getOutputStream();
  		this.bufferedInputStream = new PreBufferedInputStream( socketInputStream );
  		
  		setToBeClosed( false ); // LocalSocket connections are kept open by default
  	}
  
  	protected void sendImpl( CommMessage message )
  		throws IOException
  	{
  		protocol().send( socketOutputStream, message, bufferedInputStream );
  		socketOutputStream.flush();
  	}
  	
  	protected CommMessage recvImpl()
  		throws IOException
  	{
  		return protocol().recv( bufferedInputStream, socketOutputStream );
  	}
  	
  	protected void closeImpl()
  		throws IOException
  	{
  		socket.close();
  	}
  
  	public synchronized boolean isReady()
  		throws IOException
  	{
  		boolean ret = false;
  
  		if ( bufferedInputStream.hasCachedData() ) {
  			ret = true;
  		} else {
  			byte[] r = new byte[1];
  			if ( socketInputStream.read( r ) > 0 ) {
  				bufferedInputStream.append( r[0] );
  				ret = true;
  			}
  		}
  
  		return ret;
  	}
  	
  	@Override
  	public void disposeForInputImpl()
  		throws IOException
  	{
  		Interpreter.getInstance().commCore().registerForPolling( this );
  	}
  }
  