code: /***************************************************************************
   *   Copyright (C) 2006-2015 by Fabrizio Montesi <famontesi@gmail.com>     *
   *                                                                         *
   *   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.runtime.embedding;
  
  import java.io.IOException;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import jolie.Interpreter;
  import jolie.net.CommChannel;
  import jolie.net.CommMessage;
  import jolie.net.PollableCommChannel;
  import jolie.runtime.InvalidIdException;
  import jolie.runtime.JavaService;
  
  
  // TODO: this should not be polled
  
  /**
   * @author Fabrizio Montesi
   */
  public class JavaCommChannel extends CommChannel implements PollableCommChannel
  {
  	private final JavaService javaService;
  	private final Map< Long, CommMessage > messages = new ConcurrentHashMap<>();
  	
  	public JavaCommChannel( JavaService javaService )
  	{
  		this.javaService = javaService;
  	}
  
  	@Override
  	public boolean isReady()
  	{
  		return messages.isEmpty() == false;
  	}
  
  	@Override
  	protected void disposeForInputImpl()
  		throws IOException
  	{
  		Interpreter.getInstance().commCore().registerForPolling( this );
  	}
  
  	@Override
  	public CommChannel createDuplicate()
  	{
  		return new JavaCommChannel( javaService );
  	}
  
  	@Override
  	public void send( CommMessage message )
  		throws IOException
  	{
  		sendImpl( message );
  	}
  
  	@Override
  	protected void sendImpl( CommMessage message )
  		throws IOException
  	{
  		try {
  			final CommMessage response = javaService.callOperation( message );
  			messages.put( message.id(), response );
  		} catch( IllegalAccessException | InvalidIdException e ) {
  			throw new IOException( e );
  		}
  	}
  
  	@Override
  	protected CommMessage recvImpl()
  		throws IOException
  	{
  		throw new IOException( "Unsupported operation" );
  	}
  
  	@Override
  	public CommMessage recvResponseFor( CommMessage request )
  		throws IOException
  	{
  		return messages.remove( request.id() );
  	}
  
  	@Override
  	protected void closeImpl()
  	{}
  }
  