connection.java

Java Communicating Agents是一个用于开发网络反应式信息agent的框架

/*
 * $Source: /home/data/cvsroot/src/jacomma/icm/io/Connection.java,v $
 * $Revision: 1.4 $
 * $Date: 2000/10/28 20:09:07 $
 *
 * This file is part of the jacomma framework
 * Copyright (c) 2000 	Dimitrios Vyzovitis
 *			mailto:[e-mail]
 *			
 *
 *			
 *			
 *			
 *
 *	This library 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 library 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 Library General Public License for more details.
 *
 *	You should have received a copy of the GNU Library General Public License
 *	along with this library; if not, write to the Free Software
 *	Foundation, Inc., 59 Temple Place, Suite 330, 
 *	Boston, MA  02111-1307  USA
 */

package jacomma.icm.io;

import java.net.Socket;
import java.net.InetAddress;

import jacomma.util.Environment;

/**
 * TBA
 **/
public class Connection {
	
	public static final int DEFAULT_PORT = 4549;

	public static final Connection open() 
		throws java.io.IOException, java.net.UnknownHostException {

		String cs = (String)Environment.getProperty( "icm.host" );
		String ps =  (String)Environment.getProperty( "icm.port" );
		
		return open( ( cs == null ) ?
					 InetAddress.getLocalHost() : InetAddress.getByName( cs ),
					 ( ps == null ) ?
					 DEFAULT_PORT : Integer.valueOf( ps ).intValue() );
		
	}
	
	public static final Connection open( InetAddress host, int port ) 
		throws java.io.IOException {
		Socket sock = new Socket( host, port );
		return new Connection( sock, 
							   sock.getOutputStream(), 
							   new java.io.BufferedInputStream( sock.getInputStream() ) );
	}
	
	Socket sock_;
	ObjectWriter writer_;
	ObjectReader reader_;

	protected Connection( Socket sock, java.io.OutputStream out, java.io.InputStream in ) {
		sock_ = sock;
		writer_ = new ObjectWriter( out );
		reader_ = new ObjectReader( in );
	}
	
	public void writeObject( Object obj ) throws java.io.IOException {
		writer_.writeObject( obj );
	}
	
	public void writeObject( Object obj, Object hint )
		throws java.io.IOException {
		writer_.writeObject( obj, hint );
	}
	
	public Object readObject() throws java.io.IOException {
		return reader_.readObject();
	}

	public Object readObject( Object hint ) throws java.io.IOException {
		return reader_.readObject( hint );
	}
	
	public boolean available() throws java.io.IOException {
		return reader_.available() > 0;
	}

	public void flush() throws java.io.IOException {
		writer_.flush();
	}
	
	public void close() throws java.io.IOException {
		reader_.close();
		writer_.close();
		sock_.close(); // this might be unecessary
	}


}